[求助]matlab图象处理的问题
<P>我没学过matlab,但最近需要用到下面这个程序，对于一些语句的功能我不太懂，你各位高手赐教，不胜感激！！！！<BR>onion = imread('onion.png');<BR>peppers = imread('peppers.png');</P><P>imshow(onion)<BR>figure, imshow(peppers)</P>
<P><BR>% non-interactively<BR>rect_onion = ;<BR>rect_peppers = ;<BR>sub_onion = imcrop(onion,rect_onion);<BR>sub_peppers = imcrop(peppers,rect_peppers);</P>
<P>% OR</P>
<P>% interactively<BR>% = imcrop(onion); % choose the pepper below the </P>
<P>onion<BR>% = imcrop(peppers); % choose the whole onion</P>
<P>% display sub images<BR>figure, imshow(sub_onion)<BR>figure, imshow(sub_peppers)</P>
<P><BR>c = normxcorr2(sub_onion(:,:,1),sub_peppers(:,:,1));<BR>figure, surf(c), shading flat</P>
<P><BR>% offset found by correlation<BR> = max(abs(c(:)));<BR> = ind2sub(size(c),imax(1));<BR>corr_offset = [(xpeak-size(sub_onion,2))<BR> (ypeak-size(sub_onion,1))];</P>
<P>% relative offset of position of subimages<BR>rect_offset = [(rect_peppers(1)-rect_onion(1))<BR> (rect_peppers(2)-rect_onion(2))];</P>
<P>% total offset<BR>offset = corr_offset + rect_offset;<BR>xoffset = offset(1);<BR>yoffset = offset(2);</P>
<P>xbegin = round(xoffset+1);<BR>xend = round(xoffset+ size(onion,2));<BR>ybegin = round(yoffset+1);<BR>yend = round(yoffset+size(onion,1));</P>
<P>% extract region from peppers and compare to onion<BR>extracted_onion = peppers(ybegin:yend,xbegin:xend,:);<BR>if isequal(onion,extracted_onion)<BR> disp('onion.png was extracted from peppers.png')<BR>end</P>
<P><BR>recovered_onion = uint8(zeros(size(peppers)));<BR>recovered_onion(ybegin:yend,xbegin:xend,:) = onion;<BR>figure, imshow(recovered_onion)</P>
<P><BR> = size(peppers);<BR>mask = ones(m,n);<BR>i = find(recovered_onion(:,:,1)==0);<BR>mask(i) = .2; % try experimenting with different levels of<BR> % transparency</P>
<P>% overlay images with transparency<BR>figure, imshow(peppers(:,:,1)) % show only red plane of peppers<BR>hold on<BR>h = imshow(recovered_onion); % overlay recovered_onion<BR>set(h,'AlphaData',mask)</P>
[求助]matlab图象处理的问题（图形简切与恢复）
<DIV class=quote><P><STRONG>我没学过matlab,但最近需要用到下面这个程序，对于一些语句的功能我不太懂，你各位高手赐教，不胜感激！！！！<BR></STRONG>onion = imread('onion.png');<BR>peppers = imread('peppers.png');</P>
<P>imshow(onion)<BR>figure, imshow(peppers)<STRONG>请问能否确定读出图片的区域值？？</STRONG></P>
<P><BR>% non-interactively<BR>rect_onion = ;<BR>rect_peppers = ;<STRONG>怎么确定要剪切的图片的区域范围？？</STRONG><BR>sub_onion = imcrop(onion,rect_onion);<BR>sub_peppers = imcrop(peppers,rect_peppers);</P>
<P>% OR</P>
<P>% interactively<BR>% = imcrop(onion); % choose the pepper below the </P>
<P>onion<BR>% = imcrop(peppers); % choose the whole onion</P>
<P>% display sub images<BR>figure, imshow(sub_onion)<BR>figure, imshow(sub_peppers)</P>
<P><STRONG>后面的好多语句不知道什么意思，恳请各位高手将每句注释一下，谢谢！！</STRONG><BR>c = normxcorr2(sub_onion(:,:,1),sub_peppers(:,:,1));<BR>figure, surf(c), shading flat</P>
<P><BR>% offset found by correlation<BR> = max(abs(c(:)));<BR> = ind2sub(size(c),imax(1));<BR>corr_offset = [(xpeak-size(sub_onion,2))<BR> (ypeak-size(sub_onion,1))];</P>
<P>% relative offset of position of subimages<BR>rect_offset = [(rect_peppers(1)-rect_onion(1))<BR> (rect_peppers(2)-rect_onion(2))];</P>
<P>% total offset<BR>offset = corr_offset + rect_offset;<BR>xoffset = offset(1);<BR>yoffset = offset(2);</P>
<P>xbegin = round(xoffset+1);<BR>xend = round(xoffset+ size(onion,2));<BR>ybegin = round(yoffset+1);<BR>yend = round(yoffset+size(onion,1));</P>
<P>% extract region from peppers and compare to onion<BR>extracted_onion = peppers(ybegin:yend,xbegin:xend,:);<BR>if isequal(onion,extracted_onion)<BR> disp('onion.png was extracted from peppers.png')<BR>end</P>
<P><BR>recovered_onion = uint8(zeros(size(peppers)));<BR>recovered_onion(ybegin:yend,xbegin:xend,:) = onion;<BR>figure, imshow(recovered_onion)</P>
<P><BR> = size(peppers);<BR>mask = ones(m,n);<BR>i = find(recovered_onion(:,:,1)==0);<BR>mask(i) = .2; % try experimenting with different levels of<BR> % transparency</P>
<P>% overlay images with transparency<BR>figure, imshow(peppers(:,:,1)) % show only red plane of peppers<BR>hold on<BR>h = imshow(recovered_onion); % overlay recovered_onion<BR>set(h,'AlphaData',mask)</P></DIV>
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回复：（Blackeye）[求助]matlab图象处理的问题（图形...
<DIV class=quote><B>以下是引用<I>Blackeye</I>在2006-1-7 13:41:23的发言：</B><BR><DIV class=quote>
<P><STRONG>我没学过matlab,但最近需要用到下面这个程序，对于一些语句的功能我不太懂，你各位高手赐教，不胜感激！！！！<BR></STRONG>onion = imread('onion.png');<BR>peppers = imread('peppers.png');</P>
<P>imshow(onion)<BR>figure, imshow(peppers)<STRONG>请问能否确定读出图片的区域值？？<BR><BR><BR><FONT color=#ff0000>imread读入的时候就已经确定大小了，矩阵的大小表示的就是图片的大小，比如：</FONT></STRONG><BR><FONT color=#ff0000>onion = imread('onion.png');<BR>=size(inion);<BR>则m表示纵向的像素点数，n表示横向的像素点数</FONT><BR></P>
<P><BR>% non-interactively<BR>rect_onion = ;<BR>rect_peppers = ;<STRONG>怎么确定要剪切的图片的区域范围？？<BR><BR><FONT color=#ff0000>这个要看你自己的要求，你要去哪一部分就选取哪一部分</FONT><BR><BR><BR></STRONG><BR>sub_onion = imcrop(onion,rect_onion);<BR>sub_peppers = imcrop(peppers,rect_peppers);</P>
<P>% OR</P>
<P>% interactively<BR>% = imcrop(onion); % choose the pepper below the </P>
<P>onion<BR>% = imcrop(peppers); % choose the whole onion</P>
<P>% display sub images<BR>figure, imshow(sub_onion)<BR>figure, imshow(sub_peppers)</P>
<P><STRONG>后面的好多语句不知道什么意思，恳请各位高手将每句注释一下，谢谢！！<BR><BR><FONT color=#ff0000>请说明具体那些语句</FONT><BR><BR></STRONG><BR>c = normxcorr2(sub_onion(:,:,1),sub_peppers(:,:,1));<BR>figure, surf(c), shading flat</P>
<P><BR>% offset found by correlation<BR> = max(abs(c(:)));<BR> = ind2sub(size(c),imax(1));<BR>corr_offset = [(xpeak-size(sub_onion,2))<BR> (ypeak-size(sub_onion,1))];</P>
<P>% relative offset of position of subimages<BR>rect_offset = [(rect_peppers(1)-rect_onion(1))<BR> (rect_peppers(2)-rect_onion(2))];</P>
<P>% total offset<BR>offset = corr_offset + rect_offset;<BR>xoffset = offset(1);<BR>yoffset = offset(2);</P>
<P>xbegin = round(xoffset+1);<BR>xend = round(xoffset+ size(onion,2));<BR>ybegin = round(yoffset+1);<BR>yend = round(yoffset+size(onion,1));</P>
<P>% extract region from peppers and compare to onion<BR>extracted_onion = peppers(ybegin:yend,xbegin:xend,:);<BR>if isequal(onion,extracted_onion)<BR> disp('onion.png was extracted from peppers.png')<BR>end</P>
<P><BR>recovered_onion = uint8(zeros(size(peppers)));<BR>recovered_onion(ybegin:yend,xbegin:xend,:) = onion;<BR>figure, imshow(recovered_onion)</P>
<P><BR> = size(peppers);<BR>mask = ones(m,n);<BR>i = find(recovered_onion(:,:,1)==0);<BR>mask(i) = .2; % try experimenting with different levels of<BR> % transparency</P>
<P>% overlay images with transparency<BR>figure, imshow(peppers(:,:,1)) % show only red plane of peppers<BR>hold on<BR>h = imshow(recovered_onion); % overlay recovered_onion<BR>set(h,'AlphaData',mask)</P></DIV><BR></DIV>
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多谢您的指导，我还有下面这些语句的功能不清楚，请赐教~~~
（1）c = normxcorr2(sub_onion(:,:,1),sub_peppers(:,:,1));<BR>normxcorr2是实现什么功能？？(:,:,1)是什么参数？？<BR><BR>以下也大多是一些函数的功能不知道<BR>（2） = max(abs(c(:)));<BR> = ind2sub(size(c),imax(1));<BR> corr_offset = [(xpeak-size(sub_onion,2))<BR> (ypeak-size(sub_onion,1))];<BR><BR>谢谢！！！<BR><BR>（3）<BR> = size(peppers);<BR>mask = ones(m,n);<BR>i = find(recovered_onion(:,:,1)==0);<BR>mask(i) = .2; % try experimenting with different levels of<BR> % transparency<BR><BR>回复：（Blackeye）多谢您的指导，我还有下面这些语句...
<DIV class=quote><B>以下是引用<I>Blackeye</I>在2006-1-7 15:19:08的发言：</B><BR>（1）c = normxcorr2(sub_onion(:,:,1),sub_peppers(:,:,1));<BR>normxcorr2是实现什么功能？？(:,:,1)是什么参数？？<BR><BR>以下也大多是一些函数的功能不知道<BR>（2） = max(abs(c(:)));<BR> = ind2sub(size(c),imax(1));<BR> corr_offset = [(xpeak-size(sub_onion,2))<BR> (ypeak-size(sub_onion,1))];<BR><BR>谢谢！！！<BR><BR>（3）<BR> = size(peppers);<BR>mask = ones(m,n);<BR>i = find(recovered_onion(:,:,1)==0);<BR>mask(i) = .2; % try experimenting with different levels of<BR> % transparency<BR><BR></DIV><br><BR><BR>help 或者 doc自己啊
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