# Conversion to double from struct is not possible with bwconncomp

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M on 13 Feb 2014
Edited: M on 17 Feb 2014
So have this code but it keeps giving me an error at the bwconncomp line that says, Conversion to double from struct is not possible
for l=1:256 for m=1:256 for n=1:50
if (IMG(l,m,n) > 0.001)
if (( IMG(l,m,n) > 0.001)&&(IMG(l,m,n) < 0.19))
IMG(l,m,n)=1;
else
IMG(l,m,n)=0;
end
end
end
end
end
cc = zeros(256,256,50);
IMGT = zeros(256,256);
for ii = 1:50
IMGT=IMG(:,:,ii);
cc(:,:,ii) = bwconncomp(IMGT);
end
Any idea where the problem can be?

Image Analyst on 13 Feb 2014
That's not a good way to binarize if you're simply comparing to a threshold.
Explain exactly what "didn't work for me" means. Do you get an error message?

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Image Analyst on 15 Feb 2014
What did you do in your "binarizing process" such that it turned the image into a structure?
M on 16 Feb 2014
for l=1:256 for m=1:256 for n=1:50
if (IMG(l,m,n) > 0.001)
if (( IMG(l,m,n) > 0.001)&&(IMG(l,m,n) < 0.19))
IMG(l,m,n)=1;
else
IMG(l,m,n)=0;
end
end
end
end
end
So its like a band pass filter to pass some frequencies and turn them into white, and set the rest to black.
Image Analyst on 16 Feb 2014
That's not going to turn it into a structure. Anyway the whole thing (triple nested for loop) can be done a lot faster simply by doing this single line
IMG = IMG > 0.001 & IMG < 0.19;
No for loops needed at all. You should learn how to write vectorized code.