%提取图像破损区域，采用直接赋值法

X=imread('lena256.bmp');
figure(1);
imshow(X);
mask = imread('mask256.bmp');
figure(2);
imshow(mask);
[row,col]=size(X);
for i=1:row
    for j=1:col
        if mask(i,j)==0
            X(i,j)=0;
        end
    end
end
figure(3);
imshow(X);