发明名称 Image decoding apparatus and image decoding method
摘要 An image decoding apparatus and an image decoding method capable of generating a decoded image even in the case where a pixel in a block is necessary as a reference pixel, the block where an intra prediction mode specified in a stream is unavailable according to a standard, due to a transmission error, a coding-method error, or the like. An image decoding apparatus determines whether or not a reference block necessary for a specified intra prediction mode is available, based on intra-prediction mode information extracted by an intra-prediction mode extraction unit and peripheral block pixel information stored in a line memory. The image decoding apparatus includes a reference pixel determination unit which controls a switch unit; and a substitute intra-prediction image generation unit which generates a substitute intra-prediction image in the case where a reference block necessary for a specified intra prediction mode is unavailable.
申请公布号 US8885707(B2) 申请公布日期 2014.11.11
申请号 US200611887441 申请日期 2006.03.31
申请人 Panasonic Corporation 发明人 Adachi Makoto;Toida Hiroaki;Abe Kiyofumi
分类号 H04N7/12;H04N19/593;H04N19/61;H04N19/89;H04N19/44;H04N19/11;H04N19/176;H04N19/46 主分类号 H04N7/12
代理机构 Wenderoth, Lind & Ponack, L.L.P. 代理人 Wenderoth, Lind & Ponack, L.L.P.
主权项 1. An image decoding apparatus which decodes an image coded signal which is generated by dividing an image into one or more blocks and then coding the one or more blocks, said image decoding apparatus comprising: an extraction unit configured to extract, from the image coded signal, intra-prediction mode information that indicates which intra-prediction mode among a plurality of intra-prediction modes is used to intra-code a current block; a reference pixel determination unit configured to determine whether or not the intra-prediction mode information has an error by determining whether or not a reference block necessary for the intra-prediction mode indicated by the intra-prediction mode information exists in one of (i) a picture including the current block and (ii) a slice including the current block; and an intra image decoding substitute unit configured to switch the intra-prediction mode to another intra-prediction mode, and generate a decoded image of the current block using the other intra-prediction mode, when said reference pixel determination unit determines that the necessary reference block does not exist in one of the picture including the current block and the slice including the current block.
地址 Osaka JP