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Still image quantization using two-dimension trellis coded vector quantization |
Zheng Yong; Zhou Zhenghua; Zhu Weile |
Dept. of Electron. Eng., UEST of China Chengdu 610054 China |
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Abstract A method called Two Dimension Trellis Coded Vector Quantization(2D-TCVQ) which applies the method of TCQ after VQ is implemented is proposed. This method first expands the small codebook to larger virtual eodebook, then uses Viterbi algorithm in two dimension to search the minimal distortion quantized route. The expansion of codebook min-ishes the minimal distortion in every subset and improves the quantization performance. By using small size codebook 2D-TCVQ can be applied in many low-power encode/decode con-dition. Simulation states the method has advantage of O.SdB nearly over TCVQ.The method also has capability that it lias only modest encoding complexity with simple decoding and it is insensitive to channel errors.
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Received: 08 October 2000
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