In order to increase the compression ratio and reduce distortion of the original image, the Db wavelet basis of derivation is given. Mallat decomposition andreconstruction compared Db wavelet and 9-7 wavelet compression is used. Therefore, using wavelet transform for image processing and other aspects has good value.%以提高压缩比,减少失真度为目标,给出了基于Db小波基的具体推导过程.利用Mallat分解重构比较了Db小波和9-7小波的压缩效果.因此研究对于用小波变换进行图像处理等方面都有很好的应用价值.
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