Question

How can I know if an image read with imread is binary in MATLAB

I did this :

Img = imread(IMGsrc);

T = Img== 1 | Img == 0;

If min(min(T)) == ??????

    imshow(T);

end

????? = ??????

Answer 1

There are two ways you can test for binary images.

The simplest one is to test whether the image is a logical array (a logical array is returned by functions in the image processing toolbox that return binary image)

isBinaryImage = islogical(img);

Alternatively, you check whether all pixels are either 1 or 0

isBinaryImage = all( img(:)==0 | img(:)==1);