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Coding and decoding method and device

An encoding and decoding method and code stream technology are applied in the field of video image processing, which can solve the problems of high encoding and decoding complexity and low decoding efficiency, and achieve the effects of reducing encoding and decoding steps, reducing complexity and improving efficiency.

Active Publication Date: 2014-06-11
HUAWEI TECH CO LTD +1
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  • Description
  • Claims
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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

Embodiments of the present invention provide an encoding or decoding method and apparatus. The method includes: extracting first information in a bitstream; determining a chroma component intra prediction mode according to the first information; when the chroma component intra prediction mode cannot be determined according to the first information, extracting second information in the bitstream; and determining the chroma component intra prediction mode according to the second information, where the first information includes information for indicating whether the chroma component intra prediction mode is a DM mode or an LM mode, the second information is used to indicate a remaining mode as the chroma component intra prediction mode, and the remaining mode is one of available chroma component intra prediction modes other than a mode that may be determined according to the first information. The apparatus includes a first extracting unit, a first determining unit, a second extracting unit, and a second determining unit. The foregoing technical solutions may reduce the encoding information of a chroma mode and optimize sorting for the information to reduce encoding or decoding steps, thereby reducing encoding or decoding complexity and improving decoding efficiency.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/50H04N19/186
CPCH04N19/00315H04N19/00569H04N19/00278H04N19/00533H04N19/00545H04N19/00042H04N19/11H04N19/159H04N19/176H04N19/186H04N19/196H04N19/44H04N19/46H04N19/463H04N19/593H04N19/105H04N19/184H04N19/197H04N19/70
Inventor 杨海涛周建同
Owner HUAWEI TECH CO LTD
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