image to binary issues

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jchris14
jchris14 2014-10-23
评论： jchris14 2014-10-23
Hi,
i want to run a single image through multiple thresholds. Initially, i had separate lines of code for each threshold (im2bw(img,.1), im2bw(img,.2) and so on). Now i want to run the image between thresholds ranging from 0:.001:.5. thats a total of 500 hundred values. How do I write that in few lines rather than write 500 lines?
I have tried for loop
thld = 0 : .001 : .5
for i=1:500
a(i)=im2bw(img,thld)
end
but this doesn't work.
Thank you for the help

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Guillaume
Guillaume 2014-10-23
Nearly there. Use cell arrays for storing your images or a 3d matrix:
thld = 0 : .001 : .5;
for idx = 1:numel(thld)
a{idx} = im2bw(img, thld(idx));
end
or
thld = 0 : .001 : .5;
a = zeros([size(img), numel(thld)]); %better preallocate huge array
for idx = 1:numel(thld)
a(:,:, idx) = im2bw(img, thld(idx));
end
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Image Analyst
Image Analyst 2014-10-23
Yep, like I said, the badly-named "a" is the culprit. It's a string just like I said. Did you use imread() like I suggested in my prior comment? No, not in that code you just posted. Why don't you use my suggestion? It will be alright then if you do.
jchris14
jchris14 2014-10-23
Thank you for the help. I will use them.

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