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Joint source-network coding-based gradable video stream transmission method

A technology of network coding and streaming, which is applied in the field of scalable video stream transmission based on joint source-network coding, can solve the problems of reducing data transmission rate and increasing burden, and achieves the effect of reliable transmission

Inactive Publication Date: 2010-12-15
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These redundancies not only add unnecessary burden, but also reduce the data transfer rate

Method used

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  • Joint source-network coding-based gradable video stream transmission method
  • Joint source-network coding-based gradable video stream transmission method
  • Joint source-network coding-based gradable video stream transmission method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with example.

[0032] A scalable video stream transmission method based on joint source-network coding, which is used to provide a reliable transmission mechanism for scalable video streams in a wireless environment, comprising the following steps:

[0033] (1) The scalable video stream is divided into sub-code streams with different priorities, and its principle is to carry out according to the quality impact size of the reconstructed video sequence when it is decoded;

[0034] (2) Use LDPC codes with different coding rates to encode sub-code streams with different priorities to achieve unequal error protection;

[0035] (3) Perform random linear network coding on the coded LDPC codewords during transmission.

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the content involved in the above steps will be further described below.

[0037] The ...

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PUM

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Abstract

The invention discloses a joint source-network coding-based gradable video stream transmission method, which is used for providing a reliable transmission mechanism for gradable video streams in the wireless environment. The method comprises the following steps of: (1) dividing the gradable video streams into subcode streams with different priorities; (2) coding the subcode streams with different priorities by using LDPC codes with different coding rates to realize unequal error protection; and (3) performing random linear network coding on the coded LDPC code words in the transmission process. The degradable video streams are divided into the subcode streams with the different priorities by adopting network coding so as to ensure the effective use of the bandwidth resource and the quality of the decoding streams is maximized; meanwhile, important data is protected by more redundant information, and the throughput of the transmission system and the error recovery capacity of the transmission system are improved, so that the gradable code streams are reliably transmitted in the wireless environment.

Description

technical field [0001] The invention relates to a transmission technology of scalable video streams in a wireless environment, in particular to a transmission method of scalable video streams based on joint source-network coding. Background technique [0002] Reliable transmission of video over heterogeneous networks has become a research hotspot in recent years. High-bit-rate video applications require increased network throughput, because congestion will lead to queue overflow or packet loss, and packet loss in wireless channels has a more serious impact on video transmission. Since the human visual system is still sensitive to even very slight video quality degradation, how to eliminate the impact of bit errors or packet loss on video quality at the receiving end is an urgent problem to be solved. [0003] Scalable video coding technology refers to performing high-resolution and high-quality compression coding on video sequences only once, and then deciphering videos of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/64H04N7/24H04L1/00H04N19/89
Inventor 杨波宗晓飞门爱东常侃张文豪韩钰韩睿张鑫明
Owner BEIJING UNIV OF POSTS & TELECOMM
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