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function created for transform grayscale to binary doesn't work

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cyberdyne
cyberdyne 2012-8-6
Hi,
I've created this function m file to convert grayscale images to binary images (as gray2bin matlab function):
function conv_to_BW(im)
[m,n]=size(im);
BW=zeros(m,n);
for i=1:m
for j=1:n
if im(i,j)<10
BW(i,j)=0;
else BW(i,j)=1;
end
end
end
But, when I apply this function to a file in grayscale as:
conv_to_BW(grayscalefile);
it doesn't generate BW variable-image-matrix and doesn't generate m,n variables.

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采纳的回答

Matt Fig
Matt Fig 2012-8-6
You didn't specify a return value for your function. If you want your function to return something, you have to tell it to do so.
function BW = conv_to_BW(im)
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更多回答（1 个）

John Petersen
John Petersen 2012-8-6
If you're interested, this should be faster code if your image is very large or you're doing many of them.
function BW = conv_to_BW(im)
[m,n]=size(im);
BW = ones(m,n);
BW(im<10)) = 0;

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