Modified VQ-BTC algorithm for image compression

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Modified VQ-BTC algorithm for image compression

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VQ-BTC is a recent technique used in the coding of image data to combat edge degradation produced by vector quantisation (VQ) or block truncation coding (BTC). However, it has high encoding complexity and needs a large amount of memory to store 31 codebooks at both the encoder and decoder. A modified VQ-BTC (MVQ-BTC) algorithm is presented which achieves a performance close to that of VQ-BTC, but needs only three codebooks, and requires less computation time than VQ-BTC.

Inspec keywords: block codes; vector quantisation; image coding

Other keywords: vector quantisation; image compression; encoding complexity; block truncation coding; image data coding; computation time reduction; modified VQ-BTC algorithm

Subjects: Computer vision and image processing techniques; Optical information, image and video signal processing; Codes; Pattern recognition; Information theory

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