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图象压缩双正交小波滤波器的优化设计

DOI: 10.11834/jig.200303108

Keywords: 通信图象处理(510?4050),图象压缩,双正交小波滤波器,消失矩,完全重构,遗传算法

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Abstract:

为了提高图象压缩效果,提出了一种比较新颖的基于图象压缩系统的构造最优双正交小波滤波器的设计方法,即在图象编码中,从选择小波基的原则出发,并以最常用的Antonini's9/7小波基为参考,选择SPIHT为压缩方法,以压缩效果为准则来构造最优的双正交小波基,并且采用Lena为标准训练图象;然后以压缩比为参数,通过得到最大的峰值信噪比来寻找最优的双正交小波基,从而将复杂的多输入,两输出问题简化为多输入单输出的最优化问题;最后用遗传算法解决这种最优化的问题,得到了最优的双正交小波基.训练和检验的结果表明,这种最优的双正交小波基比Antoninis9/7小波基压缩效果有所提高.

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