Matlab 实现图片相似中的内容特征法

Content_Feature.m

function A=Content_Feature(str)
i=imread(str); 
g=rgb2gray(i); 


A = imresize(g,[50 50]);
imshow(A);
Min=min(min(A));
Max=max(max(A));
result=-1;
tag=Min;
for i=Min:Max
    temp=DaJin(A,i);
    if result<temp
        result=temp;
        tag=i;
    end
end

for j=1:50
    for k=1:50
        if A(j,k)>tag
            A(j,k)=1;
        else
            A(j,k)=0;
        end
    end
end

end

DaJin.m

function result=DaJin(A,threshold)
    count1=0;
    count2=0;
    B=[];
    C=[];
    for i=1:50
        for j=1:50
            if (A(i,j)>threshold) 
                count1=count1+1;
                B(count1)=A(i,j);
            else 
                count2=count2+1;
                C(count2)=A(i,j);
            end
        end
    end
    %求均值
    threshold;
    u1=mean(B);
    u2=mean(C);
    w1=size(B,2)/2500;
    w2=size(C,2)/2500;
    result=w1*w2*((u1-u2)^2);
end

main.m

clear all;
clc;
E=Content_Feature('gundam_uc-026.jpg');
F=Content_Feature('9.jpg');
G=xor(E,F);
a=sum(G(:)==1)