Re: : RE SUB PIXEL Estimation

Posted by Kenneth Sloan on
URL: http://imagej.273.s1.nabble.com/RE-SUB-PIXEL-Estimation-tp3703269p3703270.html

Goldsmith, Noel writes:
>Calvin asks about sub-pixel measuring.
>
>Yes its possible.
> ...
>The keeping everything the same, repeat the process with your unknowns.
>And it might sound easy but it is very difficult to keep everything the
>same.


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?

--
Kenneth Sloan                                            [hidden email]
Computer and Information Sciences                       [phone]
University of Alabama at Birmingham                 FAX [phone]
Birmingham, AL 35294-1170                http://www.cis.uab.edu/sloan/