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Coding and decoding method and device

A decoding device and decoding method technology, applied in the field of video image processing, can solve the problems of high encoding and decoding complexity and low decoding efficiency, and achieve the effect of reducing encoding and decoding steps, reducing complexity, and optimizing sorting

Active Publication Date: 2014-10-08
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0011] In the related art, the above-mentioned prediction mode of chroma uses TU (Truncated Unary, truncated unary) code scheme to encode and decode, the complexity of encoding and decoding is high, and the decoding efficiency is low

Method used

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  • Coding and decoding method and device
  • Coding and decoding method and device
  • Coding and decoding method and device

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Embodiment 300

[0074] Embodiment 300 includes the following.

[0075] 310. Use the entropy decoding method described above to extract DM information from the code stream. If it is determined according to the DM information that the chroma mode of the current block is the DM mode, then end the mode determination process; otherwise, execute step 320 .

[0076] 320. Use the entropy decoding method described above to extract LM information from the code stream. If it is determined according to the LM information that the chroma mode of the current block is the LM mode, then end the mode determination process; otherwise, execute step 330 .

[0077] It should be noted that if the optional modes of chroma intra prediction do not include the LM mode, there will be no LM information in the code stream. The decoding end also does not need to perform the parsing operation, and can skip this step. Whether the LM mode is included in the optional modes of the chroma intra prediction can be confirmed th...

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Abstract

The embodiment of the invention provides a coding and decoding method and device. The method includes the following steps: extracting first information in a code stream; according to the first information, determining a chroma component in-frame prediction mode; when the chroma component in-frame prediction mode cannot be determined according to the first information, extracting second information in the code stream; and according to the second information, determining the chroma component in-frame prediction mode, wherein the first information includes information used for indicating whether the chroma component in-frame prediction mode is a DM mode or an LM mode and the second information is used for indicating a rest mode used as the chroma component in-frame prediction mode and the rest mode is one of modes, which can be used for the chroma component in-frame prediction mode, excluding modes which may be determined by the first information. The device includes a first extraction unit, a first determination unit, a second extraction unit and a second determination unit. The technical scheme is capable of reducing coding information of a chroma mode and optimizing ranking so that coding and decoding steps are reduced and thus coding and decoding complexity is reduced and decoding efficiency is improved.

Description

technical field [0001] The present invention relates to the field of video image processing, and more specifically, to a codec method and device. Background technique [0002] Existing video image coding and decoding technologies include intra-frame coding technology and inter-frame coding technology. Intra-frame coding refers to the technique of compressing and coding image content by using only the spatial correlation in the currently coded image. Inter-frame coding refers to the technique of compressing and coding the current image by using the temporal correlation between the currently coded image and the coded image. In order to improve the intra-frame coding efficiency of images, the H.264 / AVC (Advanced Video Coding, Advanced Video Coding) standard introduces intra-frame prediction technology for the first time to remove the spatial information redundancy between the current coded image block and adjacent coded image blocks. Therefore, unlike the previous intra-frame...

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Application Information

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IPC IPC(8): H04N19/186H04N19/44H04N19/176H04N19/11H04N19/46
Inventor 杨海涛李斌李厚强周建同
Owner HUAWEI TECH CO LTD
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