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Video encoding and decoding method for combining LDPC channel code and H.264

A technology of video encoding and decoding, LDPC code, applied in the direction of digital video signal modification, television, image communication, etc., to achieve the effect of improving transmission reliability

Active Publication Date: 2009-12-30
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the H.264 video transmission system, the code stream encoded and decoded by the forward error correction module conforms to the H.264 syntax specification, and is not the binary stream of 0, 1, etc. assumed by the source channel independent coding, which shows that the system transmission There is still room for improvement in performance, which also prompts us to find a new source-channel joint decoding method to achieve the globally optimal error recovery performance

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  • Video encoding and decoding method for combining LDPC channel code and H.264
  • Video encoding and decoding method for combining LDPC channel code and H.264
  • Video encoding and decoding method for combining LDPC channel code and H.264

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Embodiment Construction

[0030] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0031] Such as figure 1 As shown, this embodiment includes the following steps:

[0032] Step 1, by setting encoding parameters (such as quantization step size), control the H.264 encoder, encode the original video frame of the input video sequence, and output the NAL video code stream of a specific size;

[0033] Step 2. According to the application requirements, select an LDPC encoder with a suitable code length and code rate. The length of the LDPC code word information bit must be greater than the maximum value of the NAL unit;

[0034] Step 3, the LDPC encoder fills the input ...

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Abstract

A video coding / decoding method combined LDPC channel code and H.264 of signal processing video coding / decoding technical field comprises that: in coding terminal, negotiating the length relation of NAL unit of H.264 coding and information bit of LDPC code which enables the information bit length of LDPC code larger than the most probable value of NAL unit, filling 0 to NAL unit until the length of which equals the length of LDPC code information bit, then coding information bit using LDPC; in decoding terminal, firstly, checking information decoding for reducing indeterminateness of subsequent decoding process; then, performing multi-duplicate iteration decoding, updating prior likelihood ratio of each information bit based on H.264 syntactic checking result in each iteration decoding. The invention improves the accuracy of likelihood ratio in decoding process of LDPC code, and accuracy of video transmission.

Description

technical field [0001] The invention relates to a method in the technical field of video encoding and decoding for signal processing, in particular to a video encoding and decoding method combining LDPC (Low Density Single Parity Check) channel code and H.264 (video source encoding standard). Background technique [0002] Video coding technology is crucial for applications such as video storage and transmission. The next-generation international video coding standard H.264 is still based on the hybrid coding framework. The framework of hybrid coding is a hybrid time-space video image coding method, which uses motion compensation predictive coding and variable length coding as the core technology of compression. When the data stream compressed by this type of technology is transmitted in an environment prone to interference, a single bit error in the transmitted data will quickly spread in time and space, resulting in a significant decrease in video quality and even extremel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/70
Inventor 宋利张文军解蓉徐奕冯剑舟
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION