摘要
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 new method is presented to construct a kind of compactly supported biorthogonal wavelet based on human visual system. The genetic algorithms are used to find a compactly supported biorthogonal wavelet so that the constructed wavelet can approximate the modulation transform function for HVS. The constructed wavelet is applied to image compression coding in the experiments. The experimental results indicate that the quality of construction with the new kind of wavelet is equivalent to 9/7 biorthogonal wavelets in the condition of the same bit rate, but computational load is less. It has a good performance of construction, specially for texture image compression coding.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2001年第7期846-849,共4页
Acta Optica Sinica
基金
国家自然科学基金 (6 9875 0 0 9)资助项目
