imbinarize...Undefined function

By using MATLAB R2013a.

I am the beginners and forgive me if question is not narrated in well. The Matlab shows " Undefined function 'imbinarize' for input arguments of type 'uint8'" for the following [ imbinarize(I)]

 I= imread('cameraman.tif');
>> imshow (I)
>> imbinarize(I)
Undefined function 'imbinarize' for input arguments of type 'uint8'.
Thanks for support

[Hassan El-Zahar]

this function is defined from 2016 versions and above !

[Prasanth]

% Convert to BW
threshold = graythresh(I);
BW=im2bw(I,threshold);

Answer 1

[Jan]

You can search for "Matlab imbinarize" in the net to find out, that this function belongs to the Image Processing Toolbox. Use the ver command to find out, if you have it installed and a licence for it.

[Qaisar Abbas]

Thank you

Answer 2

[Image Analyst]

You must have an old release. imbinarize was introduced in R2016a. You can try graythresh() or imquantize().

Or, for an interactive GUI to let you visually set the threshold, see the thresholding app in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862