How to find a variance to an image

I used var(image(:)) but i am getting wrong answer.

Answer 1

[Andreas Goser]

The IMAGE function returns a handle, see

http://www.mathworks.com/help/techdoc/ref/image.html

I expect VAR over a handle is not what you like to get.

A specifc example and an explanation what a "wrong answer" is exactly will help the community to be able to help you.

[Sean de Wolski]

Taking a stab in the dark, I would guess they overwrote image.