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AVS intra-frame prediction mode fast selection algorithm

An intra-frame prediction mode and fast selection technology, which is applied in the field of video coding, can solve the problems of large intra-frame prediction differences and fewer fast selection algorithms, and achieve the effects of reducing the brightness signal-to-noise ratio, saving the total encoding time, and ensuring the effect

Inactive Publication Date: 2013-12-04
张新安
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Problems solved by technology

At present, there are few fast selection algorithms for AVS intra prediction mode
Moreover, due to the large difference between the intra-frame prediction of AVS and AVS-M, the intra-frame fast algorithm of AVS-M cannot be fully used in AVS

Method used

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  • AVS intra-frame prediction mode fast selection algorithm
  • AVS intra-frame prediction mode fast selection algorithm

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Embodiment Construction

[0046] AVS intra prediction mode fast selection algorithm process of the present invention is as follows Figure 4 As shown, the main steps of the algorithm are as follows:

[0047] Step 1 Calculate the SAD of the luminance block in the vertical, horizontal, left-bottom and right-bottom directions. Select the mode corresponding to the direction with the smallest SAD as the candidate mode, and in the case of the same SAD, select the mode with a smaller mode value as the candidate mode;

[0048] Step 2 Perform intra-frame prediction of luma blocks in DC mode to obtain corresponding prediction blocks. For the other four modes, if it is the most probable mode or candidate mode, perform intra-frame prediction of luma blocks in this mode;

[0049] Step 3 Calculate the rate-distortion cost J of the luma block in DC prediction mode;

[0050] Step 4 If the most probable mode is not the DC mode, calculate the rate-distortion cost J of the luma block in the most probable mode;

[0051...

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Abstract

The invention provides an AVS intra-frame prediction mode fast selection algorithm, and the process of the fast selection algorithm is shown in the attached figure. According to the AVS intra-frame prediction mode fast selection algorithm, the correlation of optimal modes of adjacent blocks and the directivity of brightness variations in the blocks are utilized for mode anticipation so as to shrink the range of candidate modes; the number of the candidate modes of brightness blocks is reduced to three at most from original five; an optimal intra-frame prediction mode is selected for one macro block, and calculation of rate distortion cost J of the brightness blocks needs to be conducted for 20 times in optimized reference software rm52j-new. By means of the AVS intra-frame prediction mode fast selection algorithm, the calculation needs to be conducted for 12 times at the maximum and only 8 times at the minimum; compared with an rm52j-new algorithm, the average brightness signal to noise ratio of the fast selection algorithm is reduced to be less than 0.09dB, the code rate is increased to be less than 1.52%, and total coding time can be saved by 17.3%-29.5%; moreover, the anticipation of the modes by the fast selection algorithm is completely based on the characteristics of an image, and therefore effects can be guaranteed when the fast selection algorithm is applied to different sequences.

Description

technical field [0001] The invention relates to the technical field of video coding in signal processing, in particular to an AVS intra-frame prediction mode fast selection algorithm. Background technique [0002] Since C. E. Shannon proposed the source coding theory in 1948, people have done a lot of research on video image compression coding technology. After more than 60 years of research and development, many methods and technologies have emerged. AVS (Audio Video Coding Standard) is an audio and video codec standard with independent intellectual property rights in my country. [0003] Scholars at home and abroad have carried out a lot of research work on the fast selection algorithm of H.264 intra prediction mode in recent years, and achieved a lot of results. Among them, the representative ones are the fast intra-frame prediction mode selection algorithm based on local edge direction information proposed by F. Pan et al. and the correlation between rate-distortion co...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/34H04N19/593
Inventor 张新安
Owner 张新安
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