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| A high fidelity VQ coding algorithm with region adaptive subbanding |
| YANG Zhong-qi, BAI Zhi-can, LI Dong-mei, YANG Chang-sheng |
| Department of Computer, Zhejiang University, Hangzhou 310027, China |
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Abstract Image subbands can be obtained by using filterbank. Traditional compression method uses direct entropy coding for each subband. After studying the energy distribution in image subbands, we proposed a vector quantization (VQ) coding algorithm to image subband. In the algorithm, vector quantizers were adaptively designed for high-frequency bands in an image. In particular, the edges of the image were examined and fewer bits were assigned to high-energy regions. The experimental result showed that the algorithm had higher SNR and higher compression ratio than possible by traditional subband coding, JPEG and JPEG 2000.
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Received: 10 December 2003
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