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Image chroma prediction based on code in frame

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

Active Publication Date: 2008-01-02
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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  • Image chroma prediction based on code in frame

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[0059] The image chroma prediction method based on intra-frame coding in the present invention improves the intra-frame coding (INTRA) prediction in the H.264 compression coding standard, with 4*4 pixel blocks or smaller 2*2 pixel blocks and 1×1 pixel block as the prediction unit for image chrominance intra-frame coding prediction, in which 4 pixel blocks can use the same prediction mode, so that the space between multiple pixel blocks divided by the chroma block can be fully utilized The local correlation of the image can be improved to improve the encoding efficiency of image chrominance without increasing the encoding overhead in various prediction modes; of course, the four pixel blocks can also adopt different prediction modes.

[0060] The specific implementation manners of the intra-frame coding-based image chrominance prediction method of the present invention will be described in detail below in conjunction with each of the accompanying drawings. Wherein, the macroblo...

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Abstract

A method for image chorminance prediction based on intra-frame coding. The method is used for image chrominance prediction process during the intra-frame process and comprises the steps as following: dividing the chrominance blocks in the macro-blocks into a plurality of 2<sup

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 business, a series of video image compression standard technologies have been widely concerned, especially by the Motion Picture Experts Group (MPEG, Motion picture experts group) and the International Telecommunication Union (ITU, International Telecommunications Union) The advanced video compression standard H.264 jointly formulated by two standard organizations, with its advanced compression coding technology features and good compression performance, has been used in the application field of conference TV, videophone application, streaming It has been widely used in the field of media application, high definition laser vi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N7/36
CPCH04N19/00763H04N7/26292H04N7/26026H04N19/00315H04N19/00042H04N7/34H04N19/00024H04N7/26015H04N19/105H04N19/11H04N19/186H04N19/593
Inventor 熊联欢
Owner HUAWEI TECH CO LTD