MATLAB: Function created for transform grayscale to binary doesn’t work

image processingmatlab function

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.

Best Answer

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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