image to binary issues

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jchris14 2014-10-23

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评论： jchris14 2014-10-23

采纳的回答： Guillaume

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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 2014-10-23

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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

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 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 2014-10-23