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采用提升方向波变换的异源图像融合新算法
引用本文:刘启海,林玉池,冯伟昌,赵美蓉,宋乐.采用提升方向波变换的异源图像融合新算法[J].红外与激光工程,2010,39(2).
作者姓名:刘启海  林玉池  冯伟昌  赵美蓉  宋乐
作者单位:天津大学精密测试技术及仪器国家重点实验室,天津,300072
摘    要:方向波(Directionlet)变换是一种基于格子的歪斜小波变换,与标准二维小波变换相比,它具有多方向性和各向异性,能够更好地描述图像的特征.针对异源图像融合这一研究热点,提出了一种新的基于方向波变换的图像融合方法,并采用提升算法有效地解决了该变换方法的运算速度问题.首先,对已配准的两幅图像分别沿变换和队列方向进行次数不等的提升变换,得到具有各向异性的子图;然后,采用低频子图直接平均融合,高频部分选择具有较强各向异性信息分量的方法得到融合图像的所有方向波变换系数;最后,经过反变换得到融合图像.实验结果表明:该算法的融合效果和运算速度都优于标准小波变换和其他的二代小波变换.

关 键 词:方向波变换  图像融合  提升小波  融合规则

Novel different-source image fusion algorithm using lifting Directionlet transform
LIU Qi-hai,LIN Yu-chi,FENG Wei chang,ZHAO Mei-rong,SONG Le.Novel different-source image fusion algorithm using lifting Directionlet transform[J].Infrared and Laser Engineering,2010,39(2).
Authors:LIU Qi-hai  LIN Yu-chi  FENG Wei chang  ZHAO Mei-rong  SONG Le
Abstract:Directionlet transsform is a lattice-based skewed discrete wavelet transform.It has advantages of multi-directional and anisotropy compared with standard two-dimensional wavelet transform,thus,it is better at describing the characteristics of images.For the research focus of different-source image fusion,a novel fusion algorithm based on Directionlet transform was proposed,and the fusion speed was improved efficiently by combing the transform with a lifting scheme.Firstly,between transform direction and alignment direction,two registered source images were decomposed by using lifting Directionlet transform respectively in different times,thus anisotropic sub images were obtained.Then,the low frequency components were combined averagely and the selection principle of high frequency sub images were based on which has stronger anisotropic edge information.Finally,the fused image was obtained by using inverse Directionlet transform.Experimental results show that the fusion effect and speed are both better than standard wavelet transform and other second generation wavelet transform.
Keywords:Directionlet transform  Image fusion  Lifting wavelet  Fusion rule
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