IDL开发的求取两幅图像相关系数的程序，用于影像融合质量评价-IDL to strike a developed procedures for the correlation coefficient of two images for image fusion quality evaluation

IDL计算影像均值、标准差、偏差指数、信息熵、平均梯度、光谱扭曲程度、相关系数的小程序。-average gradient, correlation coefficient, entropy, cross entropy, joint entropy, mean square error and mutual information, signal to noise ratio, peak signal to noise ratio,