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Codec method and device

A decoding method and code stream 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: 2017-08-04
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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  • Codec method and device
  • Codec 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

Embodiments of the present invention provide a codec method and device. The method includes: extracting the first information in the code stream; determining the intra-frame prediction mode of the chrominance component according to the first information; and extracting the second information in the code stream when the intra-frame prediction mode of the chroma component cannot be determined according to the first information ; Determine the chroma component intra-frame prediction mode according to the second information, wherein the first information includes information indicating whether the chroma component intra-frame prediction mode is DM mode or LM mode, and the second information is used to indicate whether the chroma component frame is A remaining mode of the intra prediction mode, the remaining mode is one of the intra prediction modes available for the chroma component except the mode possibly 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 above technical solution can reduce the encoding information of the chroma mode and optimize the sorting, thereby reducing encoding and decoding steps, thereby reducing the complexity of encoding and decoding, and improving the efficiency of decoding.

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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