An Error Concealment Algorithm in Image Processing

Abstract

The invention aims at providing an error concealment algorithm of image processing. The error concealment algorithm of the image processing is used for the recovery of lost image information. The method includes: firstly, performing intra-frame or interframe initial error concealment; secondly, transforming an image into a wavelet domain and subjecting wavelet coefficients to edge enhancement; thirdly, subjecting the wavelet to inverse transformation; and lastly, performing anisotropic diffusion to further improve image quality. The whole process is clear and efficient, and edge information is maintained and enhanced as much as possible in the algorithm process. The error concealment algorithm of the image processing can be edited into the receiving end of video information transmission, and can greatly improve the quality of a decoded image with a lost block when the loss block occurs due to poor channel conditions.

Description

technical field [0001] The invention relates to an image processing method, in particular to an error concealment algorithm in image processing. Background technique [0002] In the process of transmitting compressed video information, due to non-ideal channel conditions, especially in wireless channels, there are usually multi-path transmission delays, fading effects, and Doppler frequency shifts. Therefore, transmission errors are inevitable. These errors can be divided into the following categories: 1) random bit errors introduced by wired or wireless channels in the transmitted bit stream, 2) due to network congestion, "best effort delivery" (Best Effort) transmission in wired IP networks The loss of the data packet introduced; 3) In the wireless channel transmission, the burst bit error caused by multipath propagation. However, since compressed video data is very sensitive to symbol errors, errors in a small number of symbols may cause a large number of subsequent sym...

AI Technical Summary

Problems solved by technology

However, this method needs to add extra bits. At the same time, when these auxiliary information are transmitted in wireless or IP networks, they cannot guarantee the correct reception of these auxiliary information, just like the original coded information.

Therefore, the robustness of this method cannot be guaranteed

[0006] In summary, in the existing error concealment algorithms, they have a common defect: the image after error concealment is too smooth

This is because in the existing error concealment algorithm in the space domain, the interpolation in the lost block loses the image edge information in the block, and in the existing error concealment algorithm in the time domain, it often causes the dislocation and dislocation of the image edge. Discontinuous

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