Title of Invention

IMAGE DECODER

Abstract

An image encoder including: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode; and an encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding. The prediction-mode judging unit judges, on the basis of a predetermined control signal, which one of a common prediction mode and a separate prediction mode is used for respective color components forming the input image signal, and multiplexes information on the control signal on a bit stream, multiplexes, when the common prediction mode is used, common prediction mode information on the bit stream, and multiplexes, when the common prediction mode is not used, prediction mode information for each of the color components on the bit stream.

Full Text

CLAIMS 1. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode; and an encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding, wherein the prediction-mode judging unit judges, on the basis of a predetermined control signal, which one of a common prediction mode and a separate prediction mode is used for respective color components, forming the input image signal, and multiplexes infonnation on the control signal on a bit stream, multiplexes, when the common prediction mode is used, common prediction mode information on the bit stream, and multiplexes, when the common prediction mode is not used, prediction mode information for each of the color components on the bit stream. 2. An image decoder, comprising: a decoding unit that decodes prediction mode common-use identification information indicating which one of a common prediction mode and a separate prediction mode is used for respective color components forming an input image signal and decodes prediction modes of the respective color components on the basis of a value of the prediction mode common-use identification information; and a predicted-image generating unit that generates a predicted image on the basis of the prediction modes decoded by decoding unit, wherein the decoding unit performs decoding to image data on the basis of the predicted image generated by the predicted-image generating unit. 3. The image encoder according to claim 1, wherein the prediction-mode judging unit performs judgment of the prediction mode in macro-block units and processes the prediction mode on the basis of the control signal that changes by a unit of a macro-block. 4. The image decoder according to claim 2, wherein the decoding unit performs decoding in macro-block units and decodes and uses the prediction mode common-use identification information in macro-block units. 5. The image encoder according to claim 1, wherein the prediction-mode judging unit performs judgment of the prediction mode in macro-block units and processes the prediction mode on the basis of the control signal that changes by a unit of a sequence including a plurality of frames. 6. The image decoding unit according to claim 2, wherein the decoding unit performs decoding in macro-block units and decodes and uses the prediction mode common-use identification information by a unit of a sequence including a plurality of frames. 7. An image encoding method, comprising the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted image-generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, judging, on the basis of a predetermined signal, which one of a common prediction mode and a separate prediction mode is used for respective color components forming the input image signal, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode is used, common prediction mode information on the bit stream, and multiplexing, when the common prediction mode is not used, prediction mode information for each of the color components on the bit stream; and subjecting an output in the step of judgment and multiplexing to variable-length encoding. 8. An image encoding program, for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted image-generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, judging, on the basis of a predetermined signal, which one of a common prediction mode and a separate prediction mode is used for respective color components forming the input image signal, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode is used, common prediction mode information on the bit stream, and multiplexing, when the common prediction mode is not used, prediction mode information for each of the color components on the bit stream; and subjecting an output in the step of judgment and multiplexing to variable-length encoding. 9. A computer-readable recording medium recorded with an image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted image-generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, judging, on the basis of a predetermined signal, which one of a common prediction mode and a separate prediction mode is used for respective color components forming the input image signal, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode is used, common prediction mode information on the bit stream, and multiplexing, when the common prediction mode is not used, prediction mode information for each of the color components on the bit stream; and subjecting an output in the step of judgment and multiplexing to variable-length encoding. 10. An image decoding method, comprising the steps of: decoding prediction mode common-use identification infomnation indicating which one of a common prediction mode and a separate prediction mode is used of respective color components forming the input image signal and decoding prediction modes of the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the decoded prediction modes; and performing decoding to image data on the basis of the generated predicted image. 11. An image decoding program, for causing a computer to execute the steps of: decoding prediction mode common-use identification information indicating which one of a common prediction mode and a separate prediction mode is used of respective color components forming the input image signal and decoding prediction modes of the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the prediction modes decoded; and performing decoding to image data on the basis of the generated predicted image. 12. A computer-readable recording medium recorded with an image decoding program for causing a computer to execute the steps of: decoding prediction mode common-use identification information indicating which one of a common prediction mode and a separate prediction mode is used of respective color components forming the input image signal and decoding prediction modes of the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the prediction modes decoded; and performing decoding to image data on the basis of the generated predicted image. 13. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode; and a prediction-mode encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding, wherein the prediction-mode judging unit separately performs judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object, and the prediction-mode encoding unit selects prediction mode information near the image region on an identical color component or prediction mode information in a position in a screen identical with the image region in different color components to set predicted values of the prediction modes and perform encoding of the prediction mode information. 14. The image encoder according to claim 13, wherein the prediction-mode encoding unit multiplexes, on a bit stream, identification information indicating which of the prediction mode information near an image region on an identical color component and the prediction mode information on a position in a screen identical with the image region in different color components is used as a predicted value. 15. An image decoder, comprising: a prediction-mode decoding unit that decodes prediction modes separately ocf) encoded for respective color components forming tt^ input image signal; a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and a decoding unit that generates, on the basis of prediction modes of the respective color components set by the prediction-mode decoding unit, a predicted image with the predicted-image generating unit to perform decoding to image data, wherein the prediction-mode decoding unit selects, in decoding a prediction mode allocated to a certain prediction unit, prediction mode information near an identical color component or prediction mode information allocated to prediction units in an identical position in a screen of different color components and sets a predicted value of a prediction mode to perform decoding. 16. An image decoder according to claim 15, wherein the prediction-mode decoding unit decodes, from a bit stream, identification information indicating which of the prediction mode information near an identical color component and the prediction mode information allocated to prediction units in an identical position in a screen of different color components is used as a predicted value and sets a predicted value on the basis of a value of the identification infomnation. 17. An image encoding method, comprising the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output of the step of performing judgment of a prediction mode to variable-length encoding, selecting prediction mode information near the image region on an identical color component or prediction mode information on a position in a screen identical with the image region in different color component to set predicted values of the prediction modes and perform encoding of the prediction mode information. 18. An image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output of the step of performing judgment of a prediction mode to variable-length encoding, selecting prediction mode information near the image region on an identical color component or prediction mode information on a position in a screen identical with the image region in different color component to set predicted values of the prediction modes and perform encoding of the prediction mode information. 19. A computer-readable recording medium recorded with an image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output of the step of performing judgment of a prediction mode to variable-length encoding, selecting prediction mode information near the image region on an identical color component or prediction mode information on a position in a screen identical with the image region in different color component to set predicted values of the prediction modes and perform encoding of the prediction mode information. 20. An image decoding method, comprising the steps of: decoding prediction modes separately encoded for respective color components forming the input image signal and, in decoding a prediction mode allocated to a certain prediction unit, selecting prediction mode information near an identical color component or prediction mode information allocated to prediction units in an identical position in a screen of different color components to set predicted values of the prediction modes and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of a prediction mode. 21. An image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming ti=« input image signal and, in decoding a prediction mode allocated to a certain prediction unit, selecting prediction mode information near an identical color component or prediction mode information allocated to prediction units in an identical position in a screen of different color components to set predicted values of the prediction modes and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of a prediction mode. 22. A computer-readable recording medium, recorded with an image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming ib*' input image signal and, in decoding a prediction mode allocated to a certain prediction unit, selecting prediction mode information near an identical color component or prediction mode information allocated to prediction units in an identical position in a screen of different color components to set predicted values of the prediction modes and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of a prediction mode. 23. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode; and a prediction-mode encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding, wherein the prediction-mode judging unit separately performs judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object, and the prediction-mode encoding unit refers to a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform encoding. 24. The image encoder according to claim 23, wherein the prediction-mode encoding unit dynamically updates values of predicted values of prediction mode information in the lookup table on the basis of the states of the plurality of pieces of prediction mode infonnation near the image region on the identical color component and the values of the prediction modes of the encoding object. 25. An image decoder, comprising: a prediction-mode decoding unit that decodes prediction modes separately encoded for respective color components forming an input image signal; a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; and a decoding unit that generates a predicted image with the predicted-image generating unit on the basis of prediction modes of the respective color components set by the prediction-mode decoding unit to perform decoding to image data, wherein the prediction-mode decoding unit refers to, in decoding a prediction mode allocated to a certain prediction unit, a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform encoding. 26. The image encoder according to claim 25, wherein the prediction-mode decoding unit dynamically updates values of predicted values of prediction mode information in the lookup table on the basis of the states of the plurality of pieces of prediction mode information near the image region on the identical color component and the values of the decoded prediction modes. 27. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode; and a prediction-mode encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding, wherein the prediction-mode judging unit separately performs judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object, and the prediction-mode encoding unit changes a value of a prediction mode of an encoding object to a binary sequence and, in encoding respective bins of the binary sequence, performs arithmetic encoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color component. 28. The image encoder according to claim 27, wherein the prediction-mode encoding unit uses, as the context set according to the states of the plurality of pieces of prediction information near the image region on the identical color component, a state indicating into which of prediction in an image surface vertical direction and prediction in an image surface horizontal direction a prediction mode is classified. 29. The image encoder according to claim 27, wherein the prediction-mode encoding unit uses, as the context set according to the states of the plurality of pieces of prediction information near the image region on the identical color component, a state indicating which of DC prediction and prediction other than the DC prediction is used as a prediction mode. 30. An image decoder, comprising: a prediction-mode decoding unit that decodes prediction modes separately encoded for respective color components forming an input image signal; a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; and a decoding unit that generates a predicted image with the predicted-image generating unit on the basis of prediction modes of the respective color components set by the prediction-mode decoding unit to perform decoding to image data, wherein the prediction-mode decoding unit performs, in decoding a prediction mode allocated to a certain prediction unit, arithmetic decoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color space in decoding a value of a prediction mode of a decoding object represented as a binary sequence for each bin of the binary sequence. 31. The image decoder according to claim 30, wherein the prediction-mode decoding unit uses, as the context set according to the states of the plurality of pieces of prediction information near the image region on the identical color component, a state indicating into which of prediction in an image surface vertical direction and prediction in an image surface horizontal direction a prediction mode is classified. 32. The image decoder according to claim 30, wherein the prediction-mode decoding unit uses, as the context set according to the states of the plurality of pieces of prediction information near the image region on the identical color component, a state indicating which of DC prediction and prediction other than the DC prediction a prediction mode is. 33. An image encoding method, comprising the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetemiined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output in the step of performing judgment of a prediction mode to variable-length encoding and referring to a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform encoding. 34. An image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output in the step of performing judgment of a prediction mode to variable-length encoding and referring to a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform encoding. 35. A computer-readable recording medium recorded with an image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output in the step of performing judgment of a prediction mode to variable-length encoding and referring to a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform encoding. 36. An image decoding method for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming an input image signal and referring to, in decoding a prediction mode allocated to a certain prediction unit, a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of an encoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of a prediction mode. 37. An image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming an input image signal and referring to, in decoding a prediction mode allocated to a certain prediction unit, a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of a decoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of the prediction mode. 38. A computer-readable recording medium recorded with an image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming an input image signal and referring to, in decoding a prediction mode allocated to a certain prediction unit, a lookup table obtained by tabulating combinations of states of a plurality of pieces of prediction mode information near the image region on an identical color component and predicted values for prediction modes of a decoding object to uniquely set a predicted value of prediction mode information from the states of the plurality of pieces of prediction mode information near the image region and perform decoding; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of the prediction mode. 39. An image encoding method, comprising the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output in the step of performing judgment of the prediction mode, changing a value of a prediction mode of an encoding object to a binary sequence and, in encoding respective bins of the binary sequence, performing arithmetic encoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color component. 40. An image encoding program, for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; and subjecting an output in the step of performing judgment of the prediction mode, changing a value of a prediction mode of an encoding object to a binary sequence and, in encoding respective bins of the binary sequence, performing arithmetic encoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color component. 41. A computer readable recording medium recorded with an image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode and separately performing judgment of a prediction mode for each of color components with respect to a unit of an image region of a prediction object; subjecting an output in the step of performing judgment of the prediction mode, changing a value of a prediction mode of an encoding object to a binary sequence and, in encoding respective bins of the binary sequence, performing arithmetic encoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color component. 42. An image decoding method, comprising the steps of: decoding prediction modes separately encoded for respective color components fonning an input image signal and performing, in decoding a prediction mode allocated to a certain prediction unit, arithmetic decoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color space in decoding a value of a prediction mode of a decoding object represented as a binary sequence for each bin of the binary sequence; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of the prediction mode to perform decoding to image data. 43. An image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components forming an input image signal and performing, in decoding a prediction mode allocated to a certain prediction unit, arithmetic decoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color space in decoding a value of a prediction mode of a decoding object represented as a binary sequence for each bin of the binary sequence; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of the prediction mode to perform decoding to image data. 44. A computer-readable recording medium recorded with an image decoding program for causing a computer to execute the steps of: decoding prediction modes separately encoded for respective color components fomiing an input image signal and performing, in decoding a prediction mode allocated to a certain prediction unit, arithmetic decoding while dynamically changing an occurrence probability according to a context set according to states of a plurality of pieces of prediction mode information near the image region on an identical color space in decoding a value of a prediction mode of a decoding object represented as a binary sequence for each bin of the binary sequence; generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating method; and generating a predicted image according to the step of generating a predicted image on the basis of prediction modes of the respective color components set in the step of performing decoding of the prediction mode to perform decoding to image data. 45. The image encoder according to claim 1, wherein the prediction-mode judging unit multiplexes, when the common prediction mode is used, the common prediction mode information on the bit stream as prediction mode common-use identification infonnation and multiplexes, when the common prediction mode is not used, the prediction mode information for each of the color components on the bit stream as the prediction mode common-use identification information. 46. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods, a plurality of reference image identification numbers, and a plurality of motion vectors; a prediction-mode judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge a predetermined prediction mode, a predetermined reference image identification number, and predetermined motion vector; and an encoding unit that subjects an output of the prediction-mode judging unit to variable-length encoding, wherein the prediction-mode judging unit judges, on the basis of a predetermined control signal, whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction mode, a separate reference image identification number, and a separate motion vector are used for each of the color components are used for the respective color components, multiplexes information on the control signal on the bit stream, multiplexes, when the common prediction mode, the common reference image identification number, and the common motion vector are used, common prediction mode information, the common reference image identification number, and the common motion vector on the bit stream, and multiplexes, when the common prediction mode, the common reference image identification number, and the common motion vector are not used, prediction mode information, the reference image identification number, and the motion vector for each of the color components on the bit stream. 47. An image decoder, comprising: a decoding unit that decodes prediction mode common-use identification information indicating whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective components forming an input image signal or a separate prediction mode, a separate identification number, and a separate motion vector are used for each of the color components and decodes prediction modes, reference image identification numbers, and motion vectors of the respective color components on the basis of a value of the prediction mode common-use identification information; and a predicted-image generating unit that generates a predicted image on the basis of the predicted modes, the reference image identification numbers, and the motion vectors decoded by the decoding unit, wherein the decoding unit performs decoding to image data on the basis of the predicted image generated by the predicted-image generating unit 48. The image encoder according to claim 46, wherein the prediction-mode judging unit performs judgment of the prediction mode in macro-block units and processes the prediction mode on the basis of the control signal that changes by a unit of a macro-block. 49. The image decoder according to claim 2, wherein the decoding unit performs decoding in macro-block units and decodes and uses the prediction mode common-use identification information in macro-block units. 50. The image encoder according to claim 46, wherein the prediction-mode judging unit performs judgment of the prediction mode in macro-block units and processes the prediction mode on the basis of the control signal that changes by a unit of a sequence including a plurality of frames. 51. The image decoding unit according to claim 47, wherein the decoding unit performs decoding in macro-block units and decodes and uses the prediction mode common-use identification information by a unit of a sequence including a plurality of frames. 52. An image encoding method, comprising the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods, a plurality of reference image identification numbers, and a plurality of motion vectors; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, a predetermined reference image identification number, and a predetermined motion vector, judging, on the basis of a predetermined control signal, whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction model a separate reference image identification number, and a separate motion vector are used for each of the color components, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are used, common prediction mode information, the common reference image identification number, and the common motion vector on the bit stream, and multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are not used, prediction mode information, the reference image identification number, and the motion vector for each of the color components on the bit stream; and subjecting an output of the judging step to variable-length encoding. 53. An image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods, a plurality of reference image identification numbers, and a plurality of motion vectors; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, a predetermined reference image identification number, and a predetermined motion vector, judging, on the basis of a predetermined control signal, whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction mode, a separate reference image identification number, and a separate motion vector are used for each of the color components, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are used, common prediction mode information, the common reference image identification number, and the common motion vector on the bit stream, and multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are not used, prediction mode information, the reference image identification number, and the motion vector for each of the color components on the bit stream; and subjecting an output of the judging step to variable-length encoding. 54. A computer-readable recording medium recorded with an image encoding program for causing a computer to execute the steps of: generating a predicted image in accordance with a plurality of prediction modes indicating predicted-image generating methods, a plurality of reference image identification numbers, and a plurality of motion vectors; evaluating prediction efficiency of the generated predicted image to judge a predetermined prediction mode, a predetermined reference image identification number, and a predetermined motion vector, judging, on the basis of a predetermined control signal, whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction model a separate reference image identification number, and a separate motion vector are used for each of the color components, and multiplexing information on the control signal on a bit stream, multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are used, common prediction mode information, the common reference image identification number, and the common motion vector on the bit stream, and multiplexing, when the common prediction mode, the common reference image identification number, and the common motion vector are not used, prediction mode information, the reference image identification number, and the motion vector for each of the color components on the bit stream; and subjecting an output of the judging step to variable-length encoding. 55. An image decoding method, comprising the steps of: decoding prediction mode common-use identification information indicating whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction mode, a separate identification number, and a separate motion vector are used for each of the color components and decoding prediction modes, reference image identification numbers, and motion vectors for the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the prediction modes, the reference image identification numbers, and the motion vectors decoded; and performing decoding to image data on the basis of the generated predicted image. 56. An image decoding program for causing a computer to execute the steps of: decoding prediction mode common-use identification information indicating whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction mode, a separate identification number, and a separate motion vector are used for each of the color components and decoding prediction modes, reference image identification numbers, and motion vectors for the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the prediction modes, the reference image identification numbers, and the motion vectors decoded; and performing decoding to image data on the basis of the generated predicted image. 57. A computer-readable recording medium recorded with an image decoding program for causing a computer to execute the steps of: decoding prediction mode common-use identification information indicating whether a common prediction mode, a common reference image identification number, and a common motion vector are used for respective color components forming an input image signal or a separate prediction mode, a separate identification number, and a separate motion vector are used for each of the color components and decoding prediction modes, reference image identification numbers, and motion vectors for the respective color components on the basis of a value of the prediction mode common-use identification information; generating a predicted image on the basis of the prediction modes, the reference image identification numbers, and the motion vectors decoded; and performing decoding to image data on the basis of the generated predicted image. 58. The image encoder according to claim 46, wherein the prediction-mode judging unit multiplexes, when the common prediction mode, the common reference image identification number, and the common motion vector are used, common prediction mode information, the common reference image identification number, and the common motion vector on the bit stream as prediction mode common-use identification information and multiplexes, when the common prediction mode, the common reference image identification number and the common motion vector are not used, prediction mode information for each of the color components, the common reference image identification number, and the common motion vector on the bit stream as the prediction mode common-use identification information. 59. An image encoder, which subjects an input image signal including a plurality of color components to image compression using motion compensation prediction for each of predetermined partial image regions, the image encoder comprising: an encoding-mode judging unit that determines, on the basis of a predetermined evaluation standard, encoding modes including designation of motion compensation prediction modes for designating whether an image signal included in the partial image region is subjected to intra-frame encoding or encoded according to inter-frame motion compensation prediction and designating predicted-image generating methods in encoding the image signal according to the intra-frame motion compensation prediction; a predicted-image generating unit that generates a motion compensated predicted image on the basis of the motion compensation prediction modes, reference image identification numbers, and motion vectors; and an encoding unit that subjects the encoding modes, the reference image identification numbers, and the motion vectors to variable-length encoding for each of the partial image regions and multiplexes the encoding modes, the reference image identification numbers, and the motion vectors on a bit stream, wherein the encoding-mode judging unit judges, according to a predetermined control signal, whether a common encoding mode is applied to the respective color components forming the partial image region or a separate encoding mode is applied to each of the color components, the encoding unit multiplexes information on the control signal on the bit stream, multiplexes, when the common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector on the bit stream, and multiplexes, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector on the bit stream for each of the color components, and the predicted-image generating unit generates a predicted image for the respective color components on the basis of an encoding mode, a reference image identification number, and a motion vector set according to the control signal. 60. The image encoder according to claim 59, further comprising a partial-image-area skip judging unit that evaluates a result of the intra-frame motion compensation prediction and judges whether encoding information that should be transmitted is present for the partial image area, wherein the partial-image-area skip judging unit judges, when the control signal indicates that the common encoding mode is applied to the respective color components forming the partial image area, presence or absence of encoding information in the partial image region on the basis of whether encoding information on at least one of the color components in the partial image region is present or encoding information on all the color components is not present and judges, when the control signal indicates that the separate encoding modes are applied to the respective color components forming the partial image area, presence or absence of encoding information for each of the color components, and the encoding unit multiplexes, in accordance with a result of the partial-image-area skip judging unit, image region skip information indicating presence or absence of encoding information in the partial image region on the bit stream by a unit of a partial image region in which the plurality of color components are collected or a unit of the respective color components. 61. An image decoder, which performs decoding to image data with a bit stream, which is obtained by subjecting an input image signal including a plurality of color components to compression encoding using motion compensation prediction by a unit of predetermined partial image regions, as an input, the image decoder comprising: a decoding unit that extracts, from the bit stream, information on a control signal designating whether an image signal included in the partial image regions is subjected to intra-frame encoding or encoded according to inter-frame motion compensation prediction and designating whether encoding modes including designation of motion compensation prediction modes for designating predicted-image generating methods in encoding the image signal according to the inter-frame motion compensation prediction are decoded as information common to all the color components in the partial image regions or decoded as information for each of the color components in the partial image region and decodes encoding modes, reference image identification numbers, and motion vectors for each of the partial image regions in accordance with information on the control signal and extracts the encoding modes, the reference image identification numbers, and the motion vectors from the bit stream; and a predicted-image generating unit that generates a motion compensated predicted image on the basis of the motion compensation prediction modes, the reference image identification numbers, and the motion vectors, wherein the decoding unit extracts, when the information on the control signal indicates that a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector from the bit stream and extracts, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a reference image identification number, and a motion vector from the bit stream for each of the color components, and the predicted-image generating unit generates a motion compensated predicted image for the respective color components on the basis of the encoding mode, the reference image identification number, and the motion vector extracted by the decoding unit in accordance with the information on the control signal. 62. The image decoder according to claim 61, wherein the decoding unit includes a skip-information decoding unit that decodes image region skip information designating whether encoding information that should be transmitted to the partial image region is present as a result of performing the inter-frame motion compensation prediction by a unit of the partial image area, wherein the skip-information decoding unit decodes, when the control signal indicates that the common encoding mode is applied to the respective color components forming the partial image area, the image region skip information common to all the color components to identify presence of encoding information in the partial image region and decodes, when the control signal indicates that the separate encoding modes are applied to the respective color components forming the partial image area. the image region skip information for each of the color components to identify presence of encoding information in the partial image area, and the decoding unit decodes, when encoding information that should be transmitted is present, an encoding mode, a reference image identification number, and a motion vector on the basis of the image region skip information and extracts the encoding mode, the reference image identification number, and the motion vector from the bit stream. 63. An image encoding method for subjecting an input image signal including a plurality of color components to image compression using motion compensation prediction for each of predetermined partial image regions, the image encoding method comprising: an encoding-mode judging step of determining, on the basis of a predetermined evaluation standard, encoding modes including designation of motion compensation prediction modes for designating whether an image signal included in the partial image region is subjected to intra-frame encoding or encoded according to inter-frame motion compensation prediction and designating predicted-image generating methods in encoding the image signal according to the intra-frame motion compensation prediction; a predicted-image generating step of generating a motion compensated predicted image on the basis of the motion compensation prediction modes, reference image identification numbers, and motion vectors; and an encoding step of subjecting the encoding modes, the reference image identification numbers, and the motion vectors to variable-length encoding for each of the partial image regions and multiplexing the encoding modes, the reference image identification numbers, and the motion vectors on a bit stream, wherein the encoding-mode judging step includes judging, according to a predetermined control signal, whether a common encoding mode is applied to the respective color components forming the partial image region or a separate encoding mode is applied to each of the color components, the encoding step includes multiplexing information on the control signal on the bit stream, multiplexing, when the common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector on the bit stream, and multiplexing, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector on the bit stream for each of the color components, and the predicted-image generating step includes generating a motion compensation predicted image for the respective color components on the basis of an encoding mode, a reference image identification number, and a motion vector set according to the control signal. 64. An image encoding program for causing a computer to execute: an encoding-mode judging step of designating whether an image signal included in a predetermined partial image region is subjected to intra-frame encoding or encoded according to intra-frame motion compensation prediction and judging, according to a predetermined control signal, whether a common encoding mode is applied to a plurality of color components forming the partial image region or a separate encoding mode is applied to each of the color components; a predicted-image generating step of generating motion compensated predicted image for the respective color components on the basis of encoding modes, reference image identification numbers, and motion vectors set according to the control signal; and an encoding step of multiplexing information on the control signal on a bit stream, multiplexing, when a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector on the bit stream, and multiplexing, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector on the bit stream for each of the color components. 65. A computer-readable recording medium recorded with an image encoding program for causing a computer to execute: an encoding-mode judging step of designating whether an image signal included in a predetermined partial image region is subjected to intra-frame encoding or encoded according to intra-frame motion compensation prediction and judging, according to a predetermined control signal, whether a common encoding mode is applied to a plurality of color components forming the partial image region or a separate encoding mode is applied to each of the color components; a predicted-image generating step of generating motion compensated predicted image for the respective color components on the basis of encoding modes, reference image identification numbers, and motion vectors set according to the control signal; and an encoding step of multiplexing information on the control signal on a bit stream, multiplexing, when a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector on the bit stream, and multiplexing, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector on the bit stream for each of the color components. 66. An image decoding method for performing decoding to image data with a bit stream, which is obtained by subjecting an input image signal including a plurality of color components to compression encoding using motion compensation prediction by a unit of predetermined partial image regions, as an input, the image decoding method comprising: a decoding step of extracting, from the bit stream, information on a control signal designating whether an image signal included in the partial image regions is subjected to intra-frame encoding or encoded according to inter-frame motion compensation prediction and designating whether encoding modes including designation of motion compensation prediction modes for designating predicted-image generating methods in encoding the image signal according to the inter-frame motion compensation prediction are decoded as infomnation common to all the color components in the partial image regions or decoded as information for each of the color components in the partial image region and decoding encoding modes, reference image identification numbers, and motion vectors for each of the partial image regions in accordance with information on the control signal and extracting the encoding modes, the reference image identification numbers, and the motion vectors from the bit stream; and a predicted-image generating step of generating a motion compensated predicted image on the basis of the motion compensation prediction modes, the reference image identification numbers, and the motion vectors, wherein the decoding step extracts, when the information on the control signal indicates that a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector from the bit stream and extracts, when encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a reference image identification number, and a motion vector from the bit stream for each of the color components, and the predicted-image generating step generates a motion compensated predicted image for the respective color components on the basis of the encoding mode, the reference image identification number, and the motion vector extracted by the decoding step in accordance with the information on the control signal. 67. An image decoding program for causing a computer to execute: a decoding step of extracting, from a bit stream, information on a control signal designating whether an encoding mode, which includes designation of a motion compensation prediction mode for designating whether an image signal included in a predetermined partial image region is subjected to intra-frame encoding or encoded by intra-frame motion compensation prediction and designating a predicted-image generating method in encoding the image signal according to the intra-frame motion compensation prediction, is decoded as information common to all color components in the partial image region or decoded as information for each of the color components in the partial image area, extracting, when the information on the control signal indicates that a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector from the bit stream, and extracting, when the information on the control signal indicates that encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector for each of the color components from the bit stream; and a motion-compensated-predicted-image generating step of generating a motion compensated predicted image for the respective color components on the basis of the encoding mode, the reference image identification number, and the motion vector extracted in the decoding step in accordance with the infomriation on the control signal. 68. A computer-readable recording medium recorded with an image decoding program for causing a computer to execute: a decoding step of extracting, from a bit stream, information on a control signal designating whether an encoding mode, which includes designation of a motion compensation prediction mode for designating whether an image signal included in a predetermined partial image region is subjected to intra-frame encoding or encoded by intra-frame motion compensation prediction and designating a predicted-image generating method in encoding the image signal according to the intra-frame motion compensation prediction, is decoded as information common to all color components in the partial image region or decoded as information for each of the color components in the partial image area, extracting, when the information on the control signal indicates that a common encoding mode is applied to the respective color components forming the partial image area, a common encoding mode, a common reference image identification number, and a common motion vector from the bit stream, and extracting, when the information on the control signal indicates that encoding modes are separately applied to the respective color components forming the partial image area, a separate encoding mode, a separate reference image identification number, and a separate motion vector for each of the color components from the bit stream; and a motion-compensated-predicted-image generating step of generating a motion compensated predicted image for the respective color components on the basis of the encoding mode, the reference image identification number, and the motion vector extracted in the decoding step in accordance with the information on the control signal. 69. An image encoder, comprising: a predicted-image generating unit that generates a predicted-image in accordance with a plurality of pieces of overhead information indicating predicted-image generating methods; a judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit and judges predetermined overhead information; and an encoding unit that subjects an output of the judging unit to variable-length encoding, wherein the judging unit judges, on the basis of common-use identification information, whether common overhead information is used for respective color components forming the input image signal or separate overhead information is used for each of the color components, multiplexes the common-use identification information on a bit stream, multiplexes, when the common overhead information is used, common overhead information on the bit stream, and multiplexes, when the separate overhead information is used, overhead information for each of the color components on the bit stream. 70. An image decoder, comprising: a decoding unit that decodes common-use identification information indicating whether common overhead information is used for respective color components forming an input image signal or separate overhead information is used for each of the color components and decodes overhead information on the respective color components on the basis of a value of the common-use identification information; and a predicted-image generating unit that generates a predicted image on the basis of the overhead information decoded by the decoding unit, wherein the decoding unit performs decoding to image data on the basis of the predicted image generated by the predicted-image generating unit. 71. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of pieces of overhead information indicating predicted-image generating methods; a judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge predetermined overhead information; and an encoding unit that subjects an output of the judging unit to variable-length encoding, wherein the judging unit multiplexes information on a predetermined control signal including a number of color components on a bit stream and multiplexes overhead information on the respective color components on the bit stream on the basis of the control signal. 72. An image decoder, comprising: a decoding unit that decodes a predetermined control signal including information on a number of color components forming an input image signal and decodes overhead information on the respective color components on the basis of a value of the control signal; and a predicted-image generating unit that generates a predicted image on the basis of the overhead information decoded by the decoding unit and the control signal including the information on the number of color components, wherein the decoding unit performs decoding to image data on the basis of the predicted image generated by the predicted-image generating unit. 73. An image encoder, comprising: a predicted-image generating unit that generates a predicted image in accordance with a plurality of pieces of overhead information indicating predicted-image generating method; a judging unit that evaluates prediction efficiency of a predicted image outputted from the predicted-image generating unit to judge predetermined overhead information; and an encoding unit that subjects an output of the judging unit to variable-length encoding, wherein the judging unit multiplexes information for identifying a picture to which a slice belongs on a bit stream and multiplexes overhead information of respective color components on the bit stream on the basis of the information for identifying the picture to which the slice belongs. 74. An image decoder, comprising: a decoding unit that decodes information for identifying a picture to which a slice belongs and decodes overhead information of respective color components on the basis of a value of the information for identifying the picture to which the slice belongs; and a predicted-image generating unit that generates a predicted image on the basis of the overhead information decoded by the decoding unit, wherein the decoding unit performs decoding to image data on the basis of the predicted image generated by the predicted-image generating unit. 75. An image decoder, comprising a decoding unit that decodes, in slice units, information for identifying a picture to which the slice belongs and generates a decoded image of respective color components on the basis of a value of the information for identifying a picture to which the slice belongs, wherein the decoding unit performs decoding of a picture from a set of slice encoding data having an identical value of the information for identifying the picture to which the slice belongs. 76. An image encoded bit stream generated as a result of subjecting an input image signal including a plurality of color components to compression encoding, wherein compression data of image signals of respective color components is formed in slice units, and a parameter indicating compression data of which color component the slice data includes is multiplexed on a header region of the slice. 77. A computer-readable recording medium recorded with an image encoding bit stream generated as a result of subjecting an input image signal including a plurality of color components to compression encoding, wherein compression data of image signals of respective color components is formed in slice units, and a parameter indicating compression data of which color component the slice data includes is multiplexed on a header region of the slice.

Documents:

5700-CHENP-2007 AMENDED CLAIMS 25-06-2013.pdf

5700-CHENP-2007 AMENDED PAGES OF SPECIFICATION 25-06-2013.pdf

5700-CHENP-2007 CORRESPONDENCE OTHERS 06-08-2012.pdf

5700-CHENP-2007 CORRESPONDENCE OTHERS 20-01-2012.pdf

5700-CHENP-2007 FORM-1 25-06-2013.pdf

5700-CHENP-2007 FORM-3 25-06-2013.pdf

5700-CHENP-2007 OTHER PATENT DOCUMENT 25-06-2013.pdf

5700-CHENP-2007 OTHERS 25-06-2013.pdf

5700-CHENP-2007 POWER OF ATTORNEY 25-06-2013.pdf

5700-CHENP-2007 CORRESPONDENCE OTHERS 08-08-2012.pdf

5700-CHENP-2007 EXAMINATION REPORT REPLY RECEIVED 25-06-2013.pdf

5700-chenp-2007-abstract.pdf

5700-chenp-2007-claims.pdf

5700-chenp-2007-correspondnece-others.pdf

5700-chenp-2007-description(complete).pdf

5700-chenp-2007-drawings.pdf

5700-chenp-2007-form 1.pdf

5700-chenp-2007-form 18.pdf

5700-chenp-2007-form 3.pdf

5700-chenp-2007-form 5.pdf

5700-chenp-2007-pct.pdf