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Intraframe coding based image chroma prediction technique

An intra-frame coding and chroma prediction technology, which is applied in the field of video coding and decoding, can solve the problems of low image chroma coding efficiency and insufficient use of local correlation, and achieve the effect of improving coding efficiency.

Inactive Publication Date: 2008-04-09
HUAWEI TECH CO LTD
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Problems solved by technology

[0023] It can be seen that in the H.264 intra-frame coding prediction process, the image chrominance prediction process only uses 8×8 blocks as the prediction unit for intra-frame coding prediction, and there is no luma prediction process. The prediction process further considers the intra-frame coding prediction process with 4×4 blocks as the prediction unit, that is, the local correlation between the image chroma 4×4 blocks is not fully utilized (the so-called local correlation between blocks refers to the current block. The similarity between the pixel point and the pixel point of the nearby block); this leads to the defect that the encoding efficiency of the image chroma is not very high in the H.264 intra-frame coding prediction technology

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  • Intraframe coding based image chroma prediction technique
  • Intraframe coding based image chroma prediction technique

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[0060] The present invention improves the intra-frame coding (INTRA) prediction in the H.264 compression coding standard based on the intra-frame coding image chrominance prediction method, using 4×4 pixel blocks or smaller 2×2 pixel blocks And 1×1 pixel block is used as the prediction unit for image chrominance intra-frame coding prediction. 4 pixel blocks can use the same prediction mode, so that you can make full use of the multiple pixel blocks divided by the chrominance block. To improve the coding efficiency of image chroma without increasing the coding overhead in various prediction modes; of course, 4 pixel blocks can also use different prediction modes.

[0061] The specific implementation manner of the image chrominance prediction method based on intra-frame coding of the present invention will be described in detail below with reference to the drawings. Among them, the macro block in the multimedia video image mentioned in the method for predicting the chrominance of th...

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Abstract

The invention discloses an image shade prediction method based on infraframe encoding, which is used in the image shade prediction processing in infraframe encoding prediction processing course and includes the following steps: divide each shade block into a plurality of 2<N>is multiplied by 2<N> pixel blocks in macroblock, wherein, n=0, 1 or 2; perform image shade infraframe encoding prediction processing with each 2<N>is multiplied by 2<N> pixel block as a prediction unit. The invention also can effectively improve the encoding efficiency of image shade in video image encoding technique.

Description

Technical field [0001] The present invention relates to the technical field of video coding and decoding, and further relates to an image chrominance prediction method based on intra-frame coding. Background technique [0002] With the gradual development and rapid promotion of multimedia communication technology and multimedia communication application services, a series of video image compression standard technologies have received extensive attention, especially by the Motion Picture Experts Group (MPEG) and the International Telecommunication Union (ITU, International Telecommunications Union) The advanced video compression standard H.264 jointly formulated by two standards organizations, with its advanced compression coding technology characteristics and better compression performance, has been used in video conference applications, video phone applications, streaming Media applications, high definition digital video discs (HDDVD, High definition digital video disc) applicat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/26H04N9/64H04N19/169H04N19/593
Inventor 熊联欢
Owner HUAWEI TECH CO LTD
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