中文说明：该程序利用小波变换对图像进行融合，小波变换的绝对值大的小波系数，对应着显著的亮度变化，也就是图像中的显著特征。所以，选择绝对值大的小波系数作为我们需要的小波系数
English Description：
The program uses the wavelet transform to image fusion, wavelet transform the absolute value of the wavelet coefficients, corresponding to a significant brightness change, which is a significant feature of the image. Therefore, the choice of the absolute value of the wavelet coefficients as we need the wavelet coefficients