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Predication method for coding and decoding and predictor

A prediction method and coding and decoding technology, which is applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problems that affect the accuracy, cannot be used as a reference block, and cannot be used, so as to achieve the effect of improving accuracy

Active Publication Date: 2015-06-24
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The third case is that the adjacent block has not been processed (decoded or reconstructed), and cannot be used as a reference block
However, 33 prediction directions also make it possible to face a large number of "unavailable" reference blocks during the prediction process
If all are filled with fixed values, it will greatly affect the accuracy of prediction

Method used

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  • Predication method for coding and decoding and predictor
  • Predication method for coding and decoding and predictor
  • Predication method for coding and decoding and predictor

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Embodiment Construction

[0025] figure 2 Shown is a schematic diagram of the arrangement of image blocks. Wherein, block E is the current image block, block A is the left block of the current image block, block B is the upper block of the current image block, block D is the upper left block of the current image block, and block C is the block above the current image block. The upper right block of the current image block. The prediction method provided by the embodiment of the present invention provides a solution when any reference block among the A, B, and D blocks is unavailable. Please refer to image 3 , the prediction method provided by the embodiment of the present invention includes:

[0026] Step 101: Obtain the availability information of the reference block of the current image block, and judge whether the reference block is available according to the availability information, wherein the reference block of the current image block includes the left block and the upper block of the curre...

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Abstract

The invention provides a predication method for coding and decoding. The predication method for coding and decoding comprises the steps that the usability information of reference blocks of a current image block is obtained, and according to the usability information, whether the reference blocks are useable is judged, wherein the reference blocks of the current image block comprise a left edge block, an upper edge block and an upper left block of the current image block; if at least one reference block is usable and at least one reference block is not usable, the pixel of the usable reference block is fed into the unusable reference block so as to be used as the reference pixel value of the current image block; the current image block is predicated according to the reference pixel value.

Description

technical field [0001] The invention relates to video codec technology, in particular to a pixel prediction method in codec. Background technique [0002] The basic principle of video coding and compression is to use the correlation between space domain, time domain and code words to remove redundancy as much as possible. The current popular approach is to use a block-based hybrid video coding framework to achieve video coding and compression through steps such as prediction, transformation, quantization, and entropy coding. This coding framework has shown a strong vitality, from the earliest MPEG-1 to the latest video coding standard H.264 / AVC, and even the next generation of video coding that is being developed by the JCTVC working group (a joint working group established by MPEG and VECG). The video coding compression standard HEVC still uses this block-based hybrid video coding framework. [0003] Block-based spatial domain predictive coding technology is generally use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/593
Inventor 林永兵赖昌材
Owner HUAWEI TECH CO LTD