Dehazing a digital image in Matlab

I am attempting to dehaze an image of a drawing I created in Photoshop. My current program yields the following response:

>> % Read image
I=imread('C:\Users\Imran\Documents\Monster\monsterinthedark.jpg');
% Show image
imshow(I);
function J = deHaze(im)
JDark = darkChannel(im);
A = atmLight(im, JDark);
transmission = transmissionEstimate(im, A);
tMat = transmission;
J = getRadiance(A,im,tMat);
Warning: Image is too big to fit on screen; displaying at 50%
> In imuitools\private\initSize at 75
  In imshow at 239
??? function J = deHaze(im)
    |
Error: Function definitions are not permitted at the prompt or in scripts.

In addition, I am not confident that my attempt is correct. I wish to use dark channel prior, so I used the dehaze code given here:

https://www.mathworks.com/matlabcentral/fileexchange/46147-single-image-haze-removal-using-dark-channel-prior

I have also attached the image itself for reference. Could it be that the file is too large?

Answer 1

[Image Analyst]

It looks like you've typed that all into the command window after the >> prompt:

>> % Read image
I=imread('C:\Users\I...............

Try putting it into an m-file and running it.

In addition since you have a script followed by a function in the same m-file, you'd need to finish the function with an "end" as the last line.