说明：  基于双正交小波变换的图像融合，采用MATLAB小波工具箱编程，融合规则近似部分采用平均加权法，细节部分基于绝对值最大准则
(Based on Biorthogonal Wavelet transform image fusion, fusion rule part is similar to the weighted average method, the details of the criteria based in part on the absolute value of the largest)