参考帖子:https://blog.youkuaiyun.com/evan123mg/article/details/40052341
%灰度共生矩阵
im = imread(filename);
I=rgb2gray(im);
GLCM2 = graycomatrix(I,'Offset',[1 0;0 1;-1 0;0 -1]);%[1 0;0 1;-1 0;0 -1])代表上下左右四个方向,步长为1
stats = graycoprops(GLCM2);
Contrast=mean(stats.Contrast);%Contrast
Correlation=mean(stats.Correlation);%Correlation
Energy=mean(stats.Energy);%Energy
Homogeneity=mean(stats.Homogeneity);%Homogeneity