看不懂这几句程序，请求大家帮忙，谢谢啦，我前面做的是NCC模板匹配问题，初学图像处理，零基础，还请大家帮帮我
recovered_temple = uint8(zeros(size(F_filter2)));
recovered_temple(ybegin:yend,xbegin:xend,:) = T_gray;
figure, imshow(recovered_temple);
%Step 7: Transparently Overlay temple Image on first Image
[m,n,p] = size(F_filter2);
mask = ones(m,n);
i = find(recovered_temple(:,:,1)==0);
mask(i) = .2; % try experimenting with different levels of transparency
%尝试用不同透明度实验
% overlay images with transparency
figure, imshow(F_filter2(:,:,1)); % show only red plane of first
hold on
h = imshow(recovered_temple); % overlay recovered_temple
set(h,'AlphaData',mask)
