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基于JPEG2000的高精度整型小波变换

JPEG2000 based high-precision integer wavelet transform
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摘要 为了提高JPEG2000中的CDF-9/7整型小波变换的精度,分别分析了其中规整化乘运算和提升步两部分影响精度的因素。对于规整化乘运算,提出了有利于提高精度的一步式规整化乘的改进方案。同时,通过优化选取数据的扩展位数和乘法宽度,进一步提高了提升步精度。在JPEG2000中的测试表明使用该方法设计的整型小波具有较好的性能。 In order to improve the precision of CDF-9/7 Integer Wavelet Transform (IWT),the precision of scaling process and lifting step are analyzed respectively.By examining the scaling process,an improved one-step scaling structure is proposed.By optimizing the value of raw image data upshift and multiplication width,further precision enhancement is achieved for the lifting step.Experiment in JPEG2000 shows that the proposed IWT has a better performance than previous ones.
出处 《计算机工程与应用》 CSCD 北大核心 2007年第26期45-47,83,共4页 Computer Engineering and Applications
基金 国家自然科学基金( the National Natural Science Foundation of China under Grant No60532060 No60372043)
关键词 图像编码 9/7提升小波 精度分析 image coding 9/7 lifting wavelet precision analysis
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参考文献6

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二级参考文献9

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