Reliable video transmission method and device based on network coding

Abstract

The invention discloses a reliable video transmission method based on network coding to mainly solve the problem of lower video reconstruction quality of a receiving end caused by packet loss or error codes in a general video transmission method. The reliable video transmission method based on network coding comprises the following steps of: adding corresponding redundant information to a layered code stream used for performing the scalable video coding for each picture group of original video information, and packing the layered code stream to complete code rate distribution; performing the random linear network coding on data packets subjected to code rate distribution by using a designed global coding matrix with a nonstringent lower triangular structure; and transmitting coded information to the receiving end through a transmission channel, and decoding a network coding code stream at the receiving end by using a Gaussian elimination method, and restoring the original video information. The reliable video transmission method based on network coding has the advantages of improving the problem of lower video reconstruction quality of the receiving end caused by packet loss and time delay in the transmission process, and realizing the unequal error protection of an H. 264 / SVC (scalable video coding) code stream and the high-reliability video multicast.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a video transmission method and device, in particular to a reliable video transmission method and device based on network coding. Background technique [0002] With the increasing demand for different users to access network resources at the same time, the video multicast technology of wireless and wired networks has undergone a revolutionary leap, but the video quality is still greatly affected by limited throughput, packet loss and unpredictable delay. [0003] The traditional way to improve video quality is to use forward error correction coding to protect video data from error correction. This method enables the system to recover the lost data by generating redundant data packets to protect the source information, but when the number of lost data packets exceeds the error correction capability of the forward error correction code, this method cannot protect the source no...

AI Technical Summary

Problems solved by technology

Compared with the video transmission method that only uses random linear network coding, this method effectively reduces the delay of video transmission and improves the quality of video reconstruction, but it is complicated to implement three coding methods at the same time, which will increase the cost and cost of the system. energy consumption, so this method cannot be applied to practical video transmission systems

[0012] In addition, in the video transmission method based on random linear network coding, the rank of the global coding matrix at the decoding end is one of the elements for successful decoding, but the existing video transmission methods based on random linear network coding do not consider this problem, resulting in these poor performance of the method

Due to packet loss and delay in the actual network, the information received by the decoder may be incomplete within a certain period of time, so that the rank of the global coding matrix obtained by the decoder from the information can only decode part of the code stream. Therefore, from these codes The quality of the reconstructed video sequence will be degraded when the image is reconstructed in the stream

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