Video encoding device, video decoding device, video encoding method, video decoding method, and program

Abstract

Although a video encoding device multiplexes ctu_pcm_flag syntax indicating whether all image blocks belonging to a coding tree unit as a set of image blocks are PCM blocks, at the top of the coding tree unit, when all image blocks belonging to the coding tree unit are PCM blocks, at least cu_split_flag syntax indicative of the splitting pattern of the coding tree unit is not multiplexed to transmit PCM data efficiently.

1 - 6 . (canceled) 
     
     
         7 . A video encoding device comprising:
 transform unit which transforms an image block;   entropy encoding unit which entropy-encodes transformed data on the image block transformed by the transform unit;   PCM-encoding unit which PCM-encodes the image block;   multiplexed data selection unit which selects, for each image block, either output data of the entropy encoding unit or output data of the PCM-encoding unit; and   multiplexing unit which multiplexes data indicating whether all image blocks belonging to a coding tree unit as a set of image blocks selected by the multiplexed data selection unit are PCM blocks, at a top of the coding tree unit,   wherein when all image blocks belonging to the coding tree unit are PCM blocks, the multiplexing unit does not multiplex at least data indicative of a splitting pattern of the coding tree unit.   
     
     
         8 . A video decoding device comprising:
 de-multiplexing unit which de-multiplexes a bitstream including data indicating whether all image blocks belonging to a coding tree unit to be decoded are PCM blocks;   PCM-decoding unit which PCM-decodes PCM data on an image block included in the bitstream;   entropy decoding unit which entropy-decodes transformed data on the image block included in the bitstream; and   decoding control unit which, when all image blocks belonging to the coding tree unit are PCM blocks, determines whether or not to split the coding tree unit based on a size of an image frame to be decoded, a position of the coding tree unit, and a predetermined PCM block size.   
     
     
         9 . A video encoding method comprising:
 transforming an image block;   entropy-encoding transformed data on the transformed image block;   PCM-encoding the image block;   selecting, for each image block, either entropy-encoded data or PCM-encoded data; and   multiplexing data indicating whether all image blocks belonging to a coding tree unit as a set of image blocks are PCM blocks, at a top of the coding tree unit,   wherein when all image blocks belonging to the coding tree unit are PCM blocks, at least data indicative of a splitting pattern of the coding tree unit is not multiplexed.   
     
     
         10 . A video decoding method comprising:
 de-multiplexing a bitstream including data indicating whether all image blocks belonging to a coding tree unit to be decoded are PCM blocks;   PCM-decoding PCM data on an image block included in the bitstream;   entropy-decoding transformed data on the image block included in the bitstream; and   when all image blocks belonging to the coding tree unit are PCM block, determining whether or not to split the coding tree unit based on a size of an image frame to be decoded, a position of the coding tree unit, and a predetermined PCM block size.   
     
     
         11 . A non-transitory computer readable information recording medium storing a video encoding program, when executed by a processor, performs:
 a process of transforming an image block;   a process of entropy-encoding transformed data on the transformed image block;   a process of PCM-encoding the image block;   a process of selecting, for each image block, either entropy-encoded data or PCM-encoded data; and   a process of multiplexing data indicating whether all image blocks belonging to a coding tree unit as a set of image blocks are PCM blocks, at a top of the coding tree unit,   wherein when all image blocks belonging to the coding tree unit are PCM blocks, the computer is caused not to multiplex at least data indicative of a splitting pattern of the coding tree unit.   
     
     
         12 . A non-transitory computer readable information recording medium storing a video decoding program, when executed by a processor, performs:
 de-multiplexing a bitstream including ctu_pcm_flag syntax indicating whether all image blocks belonging to a coding tree unit to be decoded are PCM blocks;   PCM-decoding PCM data on an image block included in the bitstream;   entropy-decoding transformed data on the image block included in the bitstream; and   when all image blocks belonging to the coding tree unit are PCM block, determining whether or not to split the coding tree unit based on a size of an image frame to be decoded, a position of the coding tree unit, and a predetermined PCM block size.