Image prediction encoding device, image prediction decoding device, image prediction encoding method, image prediction decoding method, image prediction encoding program, and image prediction decoding program

Abstract

An image predictive encoding device including an intra frame predictive signal generation method determination section that determines, for adjacent areas including regenerated pixel signals and adjacent to the target area, a predictive method derived on the basis of data corresponding to the adjacent areas as an R mode predictive method or an L mode predictive method, an intra frame predictive signal generation section that generates an intra frame predictive signal on the basis of the R mode predictive method thus determined, and a subtractor, a transform section, a quantization section, and an entropy encoding section that encode a residual signal of a pixel signal of the target area on the basis of the generated intra frame predictive signal.

1 : An image prediction encoding device which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding device comprising:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the first predictive method determined by the first predictive method determination means; and   image encoding means which encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated by the predictive signal generation means.   
     
     
         2 : An image prediction encoding device which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding device comprising:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   second predictive method determination means which generates a plurality of predictive signals corresponding to a predetermined plurality of predictive methods for the target area and determines a second predictive method which is suitable for the target area from among the plurality of predictive methods in accordance with a predetermined evaluation standard;   predictive signal generation means which generates the intra frame predictive signal on the basis of the second predictive method determined by the second predictive method determination means;   mode information encoding means which relatively encodes the second predictive method on the basis of the first predictive method; and   image encoding means which encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated by the predictive signal generation means.   
     
     
         3 : The image prediction encoding device according to  claim 1 , wherein the first predictive method determination means generates a plurality of predictive signals for the adjacent areas corresponding to the predetermined plurality of predictive methods and determines a first predictive method from among the plurality of predictive methods in accordance with a predetermined evaluation standard. 
     
     
         4 : The image prediction encoding device according to  claim 1 , wherein the first predictive method determination means uses three or more predictive methods which are previously determined according to the adjacent areas to determine the first predictive method for the adjacent areas in accordance with a predetermined evaluation standard. 
     
     
         5 : An image prediction decoding device which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding device comprising:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the first predictive method determined by the first predictive method determination means;   restoration means which extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   image restoration means which restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored by the restoration means.   
     
     
         6 : An image prediction decoding device which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding device comprising:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive method deriving means which extracts a relative predictive method which is relative information identifying the predictive method relating to the target area from the compressed image data and derives a second predictive method for the target area on the basis of the first predictive method and the relative predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the second predictive method derived by the predictive method deriving means;   restoration means which extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   image restoration means which restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored by the restoration means.   
     
     
         7 : The image prediction decoding device according to  claim 5 , wherein the first predictive method determination means generates a plurality of predictive signals for the adjacent areas corresponding to the predetermined plurality of predictive methods and determines a first predictive method from among the plurality of predictive methods in accordance with a predetermined evaluation standard. 
     
     
         8 : The image prediction decoding device according to  claim 5 , wherein the first predictive method determination means uses three or more predictive methods which are previously determined according to the adjacent areas to determine the first predictive method for the adjacent areas in accordance with a predetermined evaluation standard. 
     
     
         9 : An image prediction encoding method which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding method comprising:
 a first predictive method determination step in which first predictive method determination means derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   a predictive signal generation step in which predictive signal generation means generates the intra frame predictive signal on the basis of the first predictive method determined in the first predictive method determination step; and   an image encoding step in which image encoding means encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated in the predictive signal generation step.   
     
     
         10 : An image prediction encoding method which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding method comprising:
 a first predictive method determination step in which first predictive method determination means derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   a second predictive method determination step in which second predictive method determination means generates a plurality of predictive signals corresponding to a predetermined plurality of predictive methods for the target area and determines a second predictive method which is suitable for the target area from among the plurality of predictive methods in accordance with a predetermined evaluation standard;   a predictive signal generation step in which predictive signal generation means generates the intra frame predictive signal on the basis of the second predictive method determined in the second predictive method determination step;   a mode information encoding step in which mode information encoding means relatively encodes the second predictive method on the basis of the first predictive method; and   an image encoding step in which image encoding means encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated by the predictive signal generation means.   
     
     
         11 : An image prediction decoding method which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding method comprising:
 a first predictive method determination step in which first predictive method determination means derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   a predictive signal generation step in which predictive signal generation means generates the intra frame predictive signal on the basis of the first predictive method determined in the first predictive method determination step;   a restoration step in which restoration means extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   an image restoration step in which image restoration means restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored in the restoration step.   
     
     
         12 : An image prediction decoding method which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding method comprising:
 a first predictive method determination step in which first predictive method determination means derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   a predictive method deriving step in which predictive method deriving means extracts a relative predictive method which is relative information identifying the predictive method relating to the target area from the compressed image data and derives a second predictive method for the target area on the basis of the first predictive method and the relative predictive method;   a predictive signal generation step in which predictive signal generation means generates the intra frame predictive signal on the basis of the second predictive method derived in the predictive method deriving step;   a restoration step in which restoration means extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   an image restoration step in which image restoration means restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored by the restoration means.   
     
     
         13 : An image prediction encoding program which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding program causing a computer to function as:
 first predictive method determination means which derives, based on processed data corresponding to the adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the first predictive method determined by the first predictive method determination means; and   image encoding means which encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated by the predictive signal generation means.   
     
     
         14 : An image prediction encoding program which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and encodes a residual signal between the pixel signal of the target area and the intra frame predictive signal, the image prediction encoding program causing a computer to function as:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   second predictive method determination means which generates a plurality of predictive signals corresponding to a predetermined plurality of predictive methods for the target area and determines a second predictive method which is suitable for the target area from among the plurality of predictive methods in accordance with a predetermined evaluation standard;   predictive signal generation means which generates the intra frame predictive signal on the basis of the second predictive method determined by the second predictive method determination means;   mode information encoding means which relatively encodes the second predictive method on the basis of the first predictive method; and   image encoding means which encodes a residual signal of the pixel signal of the target area on the basis of the intra frame predictive signal generated by the predictive signal generation means.   
     
     
         15 : An image prediction decoding program which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding program causing a computer to function as:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the first predictive method determined by the first predictive method determination means;   restoration means which extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   image restoration means which restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored by the restoration means.   
     
     
         16 : An image prediction decoding program which divides an image into a plurality of areas, generates an intra frame predictive signal with respect to a pixel signal contained in a target area which is a processing target among the areas, and restores the pixel signal of the target area by combining a residual signal relating to the target area contained in compressed image data and the intra frame predictive signal, the image prediction decoding program causing a computer to function as:
 first predictive method determination means which derives, based on processed data corresponding to adjacent areas comprising regenerated pixel signals and adjacent to the target area, a predictive method which generates an intra frame predictive signal which has a high correlation to the pixel signals of the adjacent areas from among a predetermined plurality of predictive methods for generating the intra frame predictive signal, and determines the predictive method as a first predictive method;   predictive method deriving means which extracts a relative predictive method which is relative information identifying the predictive method relating to the target area from the compressed image data and derives a second predictive method for the target area on the basis of the first predictive method and the relative predictive method;   predictive signal generation means which generates the intra frame predictive signal on the basis of the second predictive method derived by the predictive method deriving means;   restoration means which extracts a residual signal relating to the target area from the compressed image data to restore a regenerated residual signal; and   image restoration means which restores the pixel signal of the target area by combining the intra frame predictive signal and the regenerated residual signal restored by the restoration means.   
     
     
         17 : The image prediction encoding device according to  claim 2 , wherein the first predictive method determination means generates a plurality of predictive signals for the adjacent areas corresponding to the predetermined plurality of predictive methods and determines a first predictive method from among the plurality of predictive methods in accordance with a predetermined evaluation standard. 
     
     
         18 : The image prediction encoding device according to  claim 2 , wherein the first predictive method determination means uses three or more predictive methods which are previously determined according to the adjacent areas to determine the first predictive method for the adjacent areas in accordance with a predetermined evaluation standard. 
     
     
         19 : The image prediction decoding device according to  claim 6 , wherein the first predictive method determination means generates a plurality of predictive signals for the adjacent areas corresponding to the predetermined plurality of predictive methods and determines a first predictive method from among the plurality of predictive methods in accordance with a predetermined evaluation. 
     
     
         20 : The image prediction decoding device according to  claim 6 , wherein the first predictive method determination means uses three or more predictive methods which are previously determined according to the adjacent areas to determine the first predictive method for the adjacent areas, in accordance with a predetermined evaluation standard.