How can I solve this error ?

Here,I attached the code in the following files

otsu.m and main1.m

Undefined function 'imbinarize' for input arguments of type 'uint8'.

Error in ostu (line 43)

ostu_img = imbinarize(uint8(B),lev);

Error in main1 (line 54)

ostu_img = ostu(B);

Answer 1

[Matt J]

Sounds like you do not have the Image Processing Toolbox.