Question

İn Matlab, I want to threshold a grayscale image to convert it to a black & white image:

for k=1:Y
  for i=1:X
    if gray(i,k)>T
      gray(i,k)=1;
    else
      gray(i,k)=0;
    end
  end
end

What do you think should be the value of T?

Answer 1

If I were you, I would use the median:

gray=double(gray>median(gray(:)))

PS: you should use this more efficient code in general:

gray=double(gray>T)