Re: : RE SUB PIXEL Estimation

On Friday 31 March 2006 08:43, Kenneth Sloan wrote:

> Indeed.  Also, consider this: before you spend a great deal of trouble
> trying to get sub-pixel measurements, be sure that you know the
> difference between precision and accuracy.
>
> In this group, it's tempting to bring up the concept of "empty
> magnification'.
>
> It's possible to "find" edge locations to whatever precision you like.
> The question is: are you gaining any ACCURACY?

I think that one of the previous responses noted that you need an edge model. 
That is, you have to know in advance what the edge should look like. Once you 
have such a constraint, you can improve upon the classical resolution limit.
Nothing magic here, it is just a way to optimally use prior knowledge.

--aryeh 
--
Aryeh Weiss
Dpmt of Electrical and Computer Engineering
Bar Ilan University
Ramat Gan 52900 Israel
972-3-5317722  ; 972-3-5340697 (FAX)