[CREATE] Lens correction database

[Pablo d'Angelo]

Ted Gould schrieb:

> On Fri, 2007-05-11 at 00:48 +0200, Pablo d'Angelo wrote:
>> The idea is that people who want to correct their lens take some test shots, 
>> and use hugin to estimate the required calibration parameters. These are 
>> then sent (hugin projects and original images) to a lens database 
>> coordinator, where they are checked for plausibility and incorporated into
>> the database.
> 
> Is there anyway to use the resolution tests from DP Review site for
> this?  Seems like some good data that might help.

The problem is that the distortion parameters change with the focus. They
are different for short distance (as in the test shots) and the far distance 
(where the camera is usually used).

If calibrations at both close and far distance are available, they could be 
distinguished either by comments in the lens section, by a separate field in 
the header.

Here are some pages about how to calibrate the distortion coefficients:
http://www.erik-krause.de/verzeichnung/distort_en.htm
http://wiki.panotools.org/Lens_correction_model#Determine_lens_correction

ciao
   Pablo