Undefined function imoverlay uint8 error.

I am trying to use imoverlay and it gives me the following error : Undefined function 'imoverlay' for input arguments of type 'uint8'. How can I fix that? The following is my code.

%read the picture and convert
%it to .tiff file
I = imread('bath.jpeg');
imwrite(I, 'bath.tiff');
figure, imshow(I);

%turn the image in grayscale
%for two dimensional convertion
%to apply edge detection
J = rgb2gray(I); 
threshold = graythresh(J);
figure, imshow(J);

%apply edge detection
ED = edge(J,'canny');
figure, imshow(ED);

OV = imoverlay(J,ED, [0 255 0]);
figure, imshow(OV);

Answer 1

[Walter Roberson]

imoverlay() is not part of MATLAB; you can find it by reading http://www.mathworks.com/matlabcentral/answers/21546-imoverlay