Not enough input arguments for read an immage

Hi, I'm new to MATLAB and am having some trouble. I want read an immage form a function. this is my code:

 function [j]=readimmage(img_gray);
p=im2bw(img_gray);
imshow(p);

The error is:

Not enough input arguments.

Error in readimmage (line 2) p=im2bw(img_gray);

i know that i can use imread function but... how can I read an image file using a function unless imread ?

Answer 1

[jgg]

Check out the documentation. The function im2bw needs two arguments:

 BW = im2bw(I, level)

Where level is a number between 0 and 1, and is the cutoff for a pixel being classified as white or black. So this should work:

function [j]=readimmage(img_gray)
  p=im2bw(img_gray,0.5);
  imshow(p);
end