im2bw finding an alternative

Hey everybody, I try to find an alternative to im2bw(x,y).

Here's the code excerpt:

A1 = imread('filename.png'); A2 = im2bw(A1,0.5); %Make BW matrix (0=black, 1=white)

thanks for helping

[Geoff Hayes]

Lisa - are you looking for an alternative because you don't have access to this function? I don't think it would be that difficult to come up with your own implementation of this function.

Answer 1

[Eeshan Mitra]

If you do not have access to the Image Processing Toolbox as Geoff commented, you can manually threshold, as described in the following post:

https://www.mathworks.com/matlabcentral/answers/307299-how-can-i-convert-grayscale-image-to-binary-image-without-using-toolbox

Answer 2

[Image Analyst]

To threshold at a level of one half, try this:

level = intmax(class(A1)) / 2;
BW = A1 > level;  % Or can use < instead to get dark things.