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构造了一个与人的视觉系统模型的调制转移函数相近似的紧支撑双正交小波基。文中采用遗传算法 ,寻找一个紧支撑双正交小波函数 ,使它与调制转移函数在频域中相近似。同时将所构造的双正交小波基用于图像压缩 ,并将它与其它双正交小波进行比较。实验结果表明 ,所构造的紧支撑双正交小波基与Daubechies的 9 3小波相比较有更高的压缩比 ,与 9 7小波相比压缩性能相当 ,但计算量更小 ,它更适合于纹理图像的压缩。
A compactly supported biorthogonal wavelet base similar to the modulation transfer function of human visual system model is constructed. In this paper, genetic algorithm is used to find a compactly supported biorthonormal wavelet function that is similar to the modulation transfer function in the frequency domain. The constructed biorthonormal wavelet bases are used for image compression and compared with other biorthogonal wavelets. The experimental results show that the compactly supported biorthogonal wavelet base constructed has a higher compression ratio compared with the Daubechies 9 3 wavelet, which has the same compression performance as the 9 7 wavelet but has a smaller amount of computation. It is more suitable for texturing Image compression.