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Fuzzy reasoning based adaptive spatial error concealment method

A technology of fuzzy reasoning and error concealment, applied in television, electrical components, digital video signal modification, etc., can solve problems such as difficult to apply images

Inactive Publication Date: 2012-07-04
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Due to the variability between different images, a fixed threshold is difficult to apply to all images

Method used

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  • Fuzzy reasoning based adaptive spatial error concealment method
  • Fuzzy reasoning based adaptive spatial error concealment method
  • Fuzzy reasoning based adaptive spatial error concealment method

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Experimental program
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Embodiment Construction

[0024] Firstly, the area composed of all adjacent blocks of the lost block is analyzed, and the direction entropy used to characterize the local image characteristics is extracted by performing edge detection in the selected area, and the number of edge points representing the smooth characteristics of the area is calculated. Then use the fuzzy inference method to estimate the content of the lost block according to these image features. The result of the fuzzy inference is the membership value of the image area corresponding to a certain block type (smooth block, edge block and texture block), which represents the lost block. Content estimates the ambiguity of this process. Finally, the block type description corresponding to the maximum membership value can be used as an estimate of the content of the missing block, and it can be concealed by its corresponding masking algorithm; or the problem can be viewed vaguely, and the missing block belongs to multiple The fuzzy set uses...

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Abstract

A fuzzy reasoning based adaptive spatial error concealment algorithm is characterized by extracting a plurality of characteristics capable of reflecting the local image texture distribution by analyzing the local images formed by lost macro blocks and blocks adjacent to the macro blocks, wherein the characteristics mainly comprise the directional entropy, the number of edge pixels or variances inthe areas near the lost blocks, etc.; designing the fuzzy rules in compliance with the actual situations according to the image characteristics, adopting the fuzzy reasoning method to estimate the contents of the lost blocks and respectively computing the degrees of membership of the lost blocks relative to smooth blocks, edge blocks and texture blocks; and adopting the block type corresponding to maximum degree of membership as the estimate of the contents of the lost blocks and finally carrying out adaptive spatial concealment algorithm on the contents according to the obtained estimate of the block contents.

Description

technical field [0001] The invention relates to a technology for recovering decoded video or images with code errors in the transmission process, and belongs to the technical field of error control in video communication. Background technique [0002] In wireless, Internet and other network environments prone to bit errors, video transmission is facing enormous challenges. The current compression coding standards mainly use block-based predictive coding and variable length coding technology for information processing, and the compressed code stream is very sensitive to transmission errors. If there is an error in the transmission of the code stream, it will make the decoder unable to decode correctly or cause error propagation, which will seriously affect the reconstruction quality of the video, so it is necessary to use error control technology. Video error control technology can be roughly divided into two categories: one is the traditional forward error correction (FEC) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/64H04N7/46H04N19/89H04N19/895
Inventor 詹学峰朱秀昌洪红梁国山干宗良唐贵进蔡旻
Owner NANJING UNIV OF POSTS & TELECOMM
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