Refined codebook for grayscale image coding based on vector quantization

Yu-Chen Hu; Wu-Lin Chen; Pi-Yu Tsai

doi:10.1117/1.OE.54.7.073110

27 July 2015 Refined codebook for grayscale image coding based on vector quantization

Yu-Chen Hu, Wu-Lin Chen, Pi-Yu Tsai

Author Affiliations +

Optical Engineering, Vol. 54, Issue 7, 073110 (July 2015). https://doi.org/10.1117/1.OE.54.7.073110

Abstract

Vector quantization (VQ) is a commonly used technique for image compression. Typically, the common codebooks (CCBs) that are designed by using multiple training images are used in VQ. The CCBs are stored in the public websites such that their storage cost can be omitted. In addition to the CCBs, the private codebooks (PCBs) that are designed by using the image to be compressed can be used in VQ. However, calculating the bit rates (BRs) of VQ includes the storage cost of the PCBs. It is observed that some codewords in the CCB are not used in VQ. The codebook refinement process is designed to generate the refined codebook (RCB) based on the CCB of each image. To cut down the BRs, the lossless index coding process and the two-stage lossless coding process are employed to encode the index table and the RCB, respectively. Experimental results reveal that the proposed scheme (PS) achieves better image qualities than VQ with the CCBs. In addition, the PS requires less BRs than VQ with the PCBs.

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Yu-Chen Hu, Wu-Lin Chen, and Pi-Yu Tsai "Refined codebook for grayscale image coding based on vector quantization," Optical Engineering 54(7), 073110 (27 July 2015). https://doi.org/10.1117/1.OE.54.7.073110

Published: 27 July 2015

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