how to compute min for image with black border?

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fred bnm
fred bnm 2016-6-8
评论： Chad Greene 2016-6-17
Hi, I have an image with black border in 2000 * 2000.after using min function the output is 0 or 1.that The minimum is related to border of the image that is black.how to compute min or max other than black border? my code is here.by this code output min is NaN.
img=imread('image.tif');
figure(1),imshow(img),title('original');
[M,N]=size(img);
for i=1:M
for j=1:N
if img(i,j)<1
img(i,j)=NaN;
end
end
end
minofimg=min(min(img));

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采纳的回答

Chad Greene
Chad Greene 2016-6-8
What about
min(img(img~=0))
That is, the minimum value of img values that are not zero.
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Chad Greene
Chad Greene 2016-6-17
You can specify the range of rows and columns you want to keep. For example start with this image:
img = imread('cameraman.tif');
image(img)
colormap(gray)
And clip the first 49 rows, and the last 47 rows. Also clip the first 124 columns:
keeprows = 50:209;
keepcols = 125:256;
img_trimmed = img(keeprows,keepcols);
image(img_trimmed)

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