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A method and system for intra-frame prediction

A technology of intra-frame prediction and prediction value, which is applied in the field of communication, can solve the problems affecting the accuracy of intra-frame prediction of video images, and achieve the effects of improving intra-frame prediction accuracy, reducing residual errors, and improving efficiency

Active Publication Date: 2017-07-14
ZTE CORP
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AI Technical Summary

Problems solved by technology

The above-mentioned unidirectional prediction method causes the sample points in the same direction to be assigned the same prediction value; however, in the video frame, the luminance values ​​of a sample point and adjacent points are usually different, which will seriously affect the quality of the video image. Intra prediction accuracy

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  • A method and system for intra-frame prediction

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Embodiment Construction

[0052] In practical applications, since a sample point is very close to the median value of its neighboring surrounding sample points, the results of bidirectional prediction (forward and backward) are usually better than unidirectional prediction. Based on this situation, it is possible to perform as Figure 4 The process shown, the process includes the following steps:

[0053] Step 1: Encode the blocks in the current coding unit sequentially according to the block division sequence of the coding unit;

[0054] Step 2: Divide the pixels of the current block into two categories: one is the priority coding pixel, denoted as D; the other is the predicted pixel, denoted as P;

[0055] Step 3: perform predictive coding on the priority coding pixel D, and obtain its reconstruction value;

[0056] Specifically, the predictive encoding may use the reconstructed values ​​of adjacent pixels of the current block to perform prediction (for example, the mean value of adjacent pixels), ...

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Abstract

The invention discloses an intra-frame prediction method and system, which can divide the pixels of the current block into priority coding pixels and prediction pixels, and perform bidirectional prediction to obtain bidirectional prediction values; and perform unidirectional prediction on the current block to obtain Obtaining a unidirectional predictive value; weighting and summing the bidirectional predictive value and the unidirectional predictive value to obtain a final predictive value of the current block. The intra-frame prediction technology of the present invention utilizes the characteristics of the video image, can well combine the texture information of the image, improves the intra-frame prediction accuracy of the video image, reduces residual errors, and thus improves the efficiency of video coding and compression.

Description

technical field [0001] The present invention relates to the communication field, in particular to an intra-frame prediction method and system. Background technique [0002] The current advanced video coding standards include the intra-frame prediction function, which uses the pixels of adjacent blocks to predict the current block, so as to better eliminate the spatial redundancy in the single-frame image, so that only the prediction block and the residual of the current block are needed. Poor encoding. When the macroblock is coded in intra mode, the predicted block is constructed using previously coded and reconstructed blocks. For the luma component, a prediction block can be created for each block or macroblock. For example, in the H.264 encoding standard, there are 9 optional modes for a 4×4 luma block, and 4 optional modes for a 16×16 luma block. [0003] In the H.264 standard, some or all of the 13 sample points (A~L and Q) that have been decoded in adjacent blocks a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/573H04N19/577H04N19/59H04N19/593
CPCH04N19/11H04N19/105H04N19/176H04N19/593
Inventor 梁立伟王宁左雯王磊
Owner ZTE CORP
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