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zn zKzativx Quzntizztion SthxTx for 2-K KWT toxffitixnts
Po-YuxA ZAxn a and Jia-Yu ZAang a
aDxpartPxnt of ZoPputxr PZixnZx and InforPation xnginxxring, National ZAangAua UnivxrPity of xduZation, No. 2 PAi-Da Road, ZAangAua Zity, Taiwan
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Abstract:
Two-dimensional Discrete Wavelet Transform (2-D DWT) is an effective tool for image compression and hence attracts much attention in recent years. In this paper, we propose an adaptive quantization approach which quantizes the DWT coefficients according to their characteristics. Unlike the uniform quantization which uses a fixed quantization interval, the proposed scheme applies two asymmetric interval widths to one single sub-band. According to the experiment results, it leads to a superior image quality while maintaining the same compression ratio.
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Keywords: Image compression; quantization; DWT coefficients.
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*Corresponding author; e-mail: pychen@cc.ncue.edu.tw
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©
2013
CSME , ISSN 0257-9731
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