clear all;close all;clc;img=imread('saber9.jpg');img2=imread('saber2.jpg');imshow(img)figure,imshow(img2);tmp=rgb2gray(img);tmp2=rgb2gray(img2);img_re=imresize(tmp,[8 8]);img_re2=imresize(tmp2,[8 8]);img_re=uint8(double(img_re)/4);img_re2=uint8(double(img_re2)/4);me=mean(mean(img_re));me2=mean(mean(img_re2));for i=1:8    for j=1:8        if img_re(i,j)>=me            img_re(i,j)=1;        else            img_re(i,j)=0;        end                if img_re2(i,j)>=me2            img_re2(i,j)=1;        else            img_re2(i,j)=0;        end                            endendre=uint8(double(img_re)-double(img_re2));num=0;for i=1:8    for j=1:8        if re(i,j)~=0            num=num+1;        end    endendnum

CSDN上看到的有意思的东西。

参考：

1.

2.