Real time fine flexible coding method based on H.264

An encoding method and granular technology, applied in the field of video encoding and decoding, can solve the problems of inability to achieve real-time encoding, no consideration of front-end preprocessing, and high encoding complexity, so as to save encoding time and bit rate, high video reconstruction quality, and encoding fast effect

Inactive Publication Date: 2008-01-16
SHANGHAI UNIV +1
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Problems solved by technology

[0004] Real-time refined scalable coding based on H.264 faces two problems: coding efficiency and coding complexity
This method can obtain a better encoding effect, but it does not consider the front-end preprocessing before the transformation / quantization of the enhancement layer encoding, the encoding complexity is large, and it cannot achieve real-time encoding

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  • Real time fine flexible coding method based on H.264
  • Real time fine flexible coding method based on H.264
  • Real time fine flexible coding method based on H.264

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Embodiment Construction

[0058] An embodiment of the present invention is as follows:

[0059] The improved method based on the H.264 real-time FGS enhancement layer transformation mode is to use 4×4 integer transformation in the enhancement layer transformation in the encoding process, and analyze according to the globality of the current residual frame and the local distribution of the current residual block. In the global analysis, the singularity is found, and the number of bit planes is globally balanced by shifting down the singular value, and the corresponding upward shift is made at the decoding end; in the local analysis, the judgment of the all-zero block is made.

[0060] Its implementation steps are as follows:

[0061] a) In the preprocessing module shown in Figure 2, the global distribution statistics are performed on the current residual frame, and the distribution of singular points is counted in the difference between the reconstructed value of the basic layer and the original value, ...

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Abstract

The invention relates to a real-time fine granularity scalable encoding method based on H.264. According to the overall situation of current residual frames and the local distribution of current residual blocks, the invention finds singular points from the global analysis, makes the bit plane number wholly equilibrated through downward shift of the singular values, and makes corresponding upper shift at the decoding end; the invention determines all-zero blocks from the local analysis. The invention will use a 4*4 whole number transformation in the reinforced layer conversion fraction during encoding. Compared with the general FGS method, the complexity in the invention is obviously reduced, the video quality is higher, and the overall PSNR (peak signal noise ratio) change is smoother. Evidenced by experiments, compared with the FGS method of MPEG-4, when keeping a close code rate, the invention can increase the average brightness PSNR by 0.37dB, and increase the average encoding speed by 13.86fps, namely by 97 percent.

Description

technical field [0001] The invention relates to a method for encoding and decoding video, in particular to a real-time fine-grained scalable encoding (FGS) method based on H.264. Background technique [0002] Since ITU-T promulgated H.261, H.263, MPEG-1, MPEG-2, MPEG-4 and other international standards, it has greatly promoted the application of multimedia technology. However, with the massive increase of new services and the imminent popularization of HDTV, as well as the lower transmission bandwidth of existing transmission networks such as Cable Modem, Xdsl, and UMTS, it is urgent to improve video coding efficiency; at the same time, it is also required that video coding standards can adapt to the current There are or future networks. These problems provide a practical basis for the generation of the new video coding standard H.264. [0003] With the increase of network multimedia applications, network-based video codec technology is correspondingly very important. Bit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16H04N7/30H04N7/50H04N19/34
Inventor 张兆杨姜钦华刘志刘海鹰刘鹏飞张颖沈礼权王国中
Owner SHANGHAI UNIV
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