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Boundary gradient based video stream fault tolerance method

A gradient and boundary technology, applied in the field of digital audio and video coding and decoding, can solve problems such as decoder errors, inability to work, sequence start code errors, etc., and achieve the effect of improving subjective and objective quality and good versatility

Inactive Publication Date: 2008-04-16
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Ensuring the semantic correctness of the sequence layer syntax elements is the prerequisite for the normal operation of the decoder. Once an error occurs, the decoder will cause serious errors or even fail to work, especially errors in the sequence start code.

Method used

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  • Boundary gradient based video stream fault tolerance method
  • Boundary gradient based video stream fault tolerance method
  • Boundary gradient based video stream fault tolerance method

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Experimental program
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Embodiment Construction

[0024] The basic idea of ​​the video stream fault-tolerant method provided by the present invention is: perform layered fault-tolerant processing on the video stream, at the sequence and frame level, use the resynchronization marker inserted by the encoding end to limit the error; at the macro block level, comprehensively utilize The code stream semantics and the correlation characteristics between the macroblocks are used for error detection. For the detected macroblocks, the coding types of Intra (intra-frame coding) and Inter (inter-frame coding) are respectively processed accordingly. Due to the different encoding methods of macroblocks, the error repair methods for the two have different characteristics. Usually, the error concealment based on spatial correlation and the error concealment based on time domain correlation are used respectively, and the error concealment is performed adaptively.

[0025] From the aforementioned error analysis on the macroblock layer, it can ...

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Abstract

The invention proposes an audio current fault tolerance method based on border gradient. The method divides audio current into three grades: sequence, frame, and macro block. Different fault tolerance strategy is adopted according to the characteristics of the grammar elements in all grades. As for the sequence grade and the frame grade, fault tolerance should be implemented according to specific application environment, and the fault tolerance of the macro block grade are implemented by three steps: effective fault limitation, fault test of the lexeme and border gradient of a synthetic code current, and a self-adaptive fault hiding technology. The experiment results show that with the adoption of the audio current fault tolerance, the subjective and objective quality of the decoder restoring images is greatly improved.

Description

technical field [0001] The invention relates to a video stream fault-tolerant method, in particular to a video stream fault-tolerant method based on a boundary gradient, and belongs to the technical field of digital audio and video encoding and decoding. Background technique [0002] People's demand for multimedia services is increasing day by day. However, the quality of service (QoS) of the existing network has not been effectively guaranteed, and the bit error rate of the transmitted multimedia data stream is very high, which seriously affects the transmission quality of video images. This will undoubtedly affect the further development of multimedia services. Under the existing network architecture, there is not much room for improving the quality of video transmission by relying solely on network transmission technology, so it is necessary to improve the fault-tolerant algorithm of the video communication system so that it can overcome the high bit error rate of the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/64H04N19/89
Inventor 李波姜东胡海苗
Owner BEIHANG UNIV
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