| A high fidelity VQ coding algorithm with region adaptive subbanding |
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| 作者姓名： | 杨仲琦 白直灿 李冬梅 杨长生 |
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| 作者单位： | Department of Computer，Zhejiang University，Hangzhou 310027，China，Department of Computer，Zhejiang University，Hangzhou 310027，China，Department of Computer，Zhejiang University，Hangzhou 310027，China，Department of Computer，Zhejiang University，Hangzhou 310027，China |
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| 摘 要： | 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 showe…
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| 关 键 词： | 图象压缩 图象编码 保真度 运算法则 VQ 量子化 |
A high fidelity VQ coding algorithm with region adaptive subbanding |
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| Yang Zhong-qi,Bai Zhi-can,Li Dong-mei,Yang Chang-sheng.A high fidelity VQ coding algorithm with region adaptive subbanding[J].Journal of Zhejiang University Science,2005,6(1):43-48. |
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| Authors: | Yang Zhong-qi Bai Zhi-can Li Dong-mei Yang Chang-sheng |
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| Institution: | (1) Department of Computer, Zhejiang University, 310027 Hangzhou, 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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| Keywords: | Image compression Subband Vector quantization (VQ) |
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