Re: Creating an CGAffineTransform From Sample Points

FROM : Quincey Morris
DATE : Mon Feb 18 18:56:51 2008

On Feb 18, 2008, at 07:33, glenn andreas wrote:

> This, of course, is the key point, and based on the description from 
> the OP, it probably isn't affine, since affine projections don't do 
> perspective.  So if you take a camera looking at a piece of graph 
> paper that is slightly tilted, you're going to need something more 
> powerful than an affine projection.


Yes, the OP needs to clarify. It sounded to me as if it was something 
like matching an aerial photo in the camera to a map onscreen, based 
on the word "calibration". But I was just guessing.