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High error tolerant low time delay video transmission method and device suitable for deep space communication

A deep space communication, video transmission technology, applied in the direction of pulse modulation TV signal transmission, error prevention/detection using return channel, transmission system, etc.

Active Publication Date: 2010-06-09
TSINGHUA UNIV
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Problems solved by technology

[0006]In short, a technical problem that needs to be solved urgently by those skilled in the art is: how to reduce the delay of deep space communication and improve the efficiency of confirmation retransmission, so as to overcome the traditional deep space The video transmission protocol in air communication has the defects of low bandwidth utilization and inflexible data protection mode

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  • High error tolerant low time delay video transmission method and device suitable for deep space communication

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[0038] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] At present, in order to meet the needs of deep space communication, many transmission methods have been continuously improved, but the existing transmission methods cannot distinguish the importance of data at different positions in the code stream. For video information, the data at different positions in the code stream The degree of importance is different. For code streams with high importance, accurate transmission should be ensured, while for code streams with low importance, accurate transmission is not required.

[0040] In view of this, the present invention provides a video coding and transmission strategy, which is mainly based on the layered characteristics of scalable video coding, and performs scalable video co...

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Abstract

The invention provides a video transmission method and a device with high fault tolerance and low latency which is applied to deep space communication, wherein, the method comprises a video coding step, a base-layer data transmission step, an enhancement-layer data transmission step and a video decoding step. In the video coding step, acquired video data is processed through scalable video coding,and a scalable video coding code stream includes a base-layer code stream and at least an enhancement-layer code stream; in the base-layer data transmission step, the base-layer code stream in the scalable video coding code stream is extracted and transmitted by using an automatic retransmission request method, and the network packet loss rate is calculated when the transmission of the base-layercode stream is finished; in the enhancement-layer data transmission step, the enhancement-layer code stream is extracted, the obtained parameter is calculated for channel coding and transmission according to the packet loss rate by combining the channel coding technology for Athlon code, and the received enhancement-layer code stream is processed through channel decoding; and in the video decoding step, the received base-layer code stream is processed through video decoding, and the enhancement-layer code stream which is processed through channel decoding is processed through video decoding by combining the received base-layer code stream.

Description

technical field [0001] The invention relates to the field of digital video signal coding and transmission, in particular to a video transmission method and device with high error tolerance and low delay characteristics suitable for deep space communication. Background technique [0002] Deep space exploration refers to the exploration of the moon and outer space beyond the moon, that is, the exploration of breaking away from the earth's gravitational field and entering the space of the solar system and space. The so-called deep space generally refers to the space that is hundreds of thousands or even millions of kilometers away from the earth, while the communication distance of human artificial earth satellites in the past is usually hundreds to tens of thousands of kilometers. Therefore, even with the moon, which is 380,000 kilometers away from the earth, the problems encountered in realizing video communication are already very different from ordinary satellite communicat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24H04L1/18H04L1/00
Inventor 戴琼海陆峰肖红江尔桂花
Owner TSINGHUA UNIV
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