Error - Undefined function 'imbinarize' for input arguments of type 'double' in matlab

Question

when I calculate threshold using entropy and the convert grayscale image to binary image using imbinarize(img,T) it shows the error. How to deal with this error

Answer 1

imbinarize uses a 256 bin image histogram to compute Otsu's threshold, so it expects a 'uint' image.

From the error we can deduce that your image is double , so just convert it to uint :

img = im2uint8(img)

and then run imbinarize on top of im

im_binarized = imbinarize(img,T)

EDIT:

Also your problem might be that you don't have the image processing toolbox installed.

You can threshold an image without the toolbox, just do:

im_binarized = im > T;   % where T is your threshold