Error prevention and resilience of VQ encoded images

Authors:
Kuo-Lung Hung;Chin-Chen Chang
Affiliations:
Department of Computer Science and Information Engineering, National Chung Cheng University, 160, San-Hsing, Min-Hsiung, Chiayi 621, Taiwan;Department of Computer Science and Information Engineering, National Chung Cheng University, 160, San-Hsing, Min-Hsiung, Chiayi 621, Taiwan
Venue:
Signal Processing
Year:
2003

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Abstract

In the past few years, many techniques have been explored to investigate the transmission of VQ indices over noisy channels. In this paper, we propose an algotithm to correct or conceal the channel errors found in a VQ encoded image. In the proposed method, some verification information (i.e., the checksums) is embedded into the MSB of the indices of the VQ encoded data. This information can help with the detection of errors in the indices transmitted over a noisy channel. Before embedding, the codebook is rearranged and the binary indices are assigned to the codewords in such a way that the MSB-differing vectors are as close as possible to each other. In addition, a new error concealment technique is proposed to correct the erroneous image. According to our experiments, the proposed scheme provides a detection result with greater than a 96% probability of detection in the BER 0.01 noisy channel. Compared to the related method, Anti-Gray Coding (AGC), the proposed method performs better under BER 10-3-10-2. Moreover, our method does not have the phenomenon of false alarm that occurs in AGC. Therefore, our method is very suitable to more noisy channels-including mobile ones.