图像对比度计算MATLAB代码

基于matlab，读取图像文件并，并计算其图像对比度。 计算公式采用：各中心像素灰度值与周围8近邻像素灰度值之差的平方之和再除以差的个数。 注：直接运行，选取路径即可输出计算结果，十分方便。适用于大量图片待计算时使用。

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%计算图像对比度
%中心像素灰度值与周围8近邻像素灰度值之差的平方之和，除以以上之差的个数。
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clear;
clc;
format long;
[filenamepathname] = uigetfile（{‘*.jpg;*.bmp;*.png‘}‘打开待测对比度的图像‘）;
if filename == 0
    return;
end
pic = imread（[pathnamefilename]）;
[mnl] = size（pic）;%求原始图像的行数m和列数n
if l>=2
    pic = rgb2gray（pic）;