Identifying filled circles in a scanned image

[Paul McGuire]

Douglas Douglas wrote:
> The problem is that when the scanner takes the pages it
> doesn't put it in the same exact position in its bed. There's not a lot of
> difference, but there's a little.

Your forms should have some reference registration marks or targets in
opposite corners.  Find these first, then you should be able to
interpolate pixel positions from there, using a 2D trans/rotational
transform.

-- Paul