基于非下采样Contourlet变换的遥感影像融合

根据非下采样Contourlet变换的特点,提出一种基于非下采样Contourlet变换和IHS变换相结合的遥感影像融合方法.该方法首先对金色影像和多光谱影像经IHS变换后的I分量分别进行非下采样Contourlet 变换;然后采取不同的融合策略分别对高低频系数进行融合:低频系数采用区域能量加权的方法进行融合,高频系数则利用八邻域梯度优先的原则进行融合;最后通过非下采样Contourlet逆变换和IHS逆变换得到融合影像.实验结果表明,该方法在提高融合影像空间分辨率的同时,能更好地保持影像的光谱质量.

Fusion of Remote Sensing Image Based on Nonsubsampled Contourlet Transform

According to the characteristics of nonsubsampled contourlet transform,a algorithm of remote sensing image fusion which is based on the combination of nonsubsampled contourlet transform and IHS transform was proposed.Firstly,the nonsubsampled contourlet transform is done separately with the panchromatic image and the multi-spectral image’s intensity component which came from the IHS transform;then the high and low frequency coefficients are fused separately by using different fusion strategies: the low frequency coefficient is fused by the regional energy weighted method,while the high frequency coefficient was fused by using the principle of eight neighborhood gradient priority;finally the target image is obtained by performing inverse nonsubsampled contourlet transform and inverse IHS transform.The experimental results showed that: the proposed method could improve the spatial resolution of the fusion image,and at the same time,it could keep the image’s spectral quality better.