[CREATE] Draft Lens Correction Database
create07 at sfina.com
Tue Jun 19 11:23:12 PDT 2007
I have not had all the time I wanted to dedicate to this, so it is
uncomplete. Herewith I share the current draft, hoping that somebody
will pick it up and continue from here.
Architecture: a mysql database with web based input / output. Export
format, relevant for the desktop tools using the db, XML.
Two type of inputs: deterministic (i.e. specific correction parameters
as determined by a volunteer who intended to calibrate the lens) and
stochastic (i.e. the parameters obtained while optimizing a hugin
project). Credit goes to Bruno Postle and JD Smith on the hugin-ptx list
for this second approach. In both approaches the critical settings are
proper physical lens set up. The deterministic approach relies on the
volunteer to set 100% perfectly, which is seldom the case. The
stochastic approach is based on mean-reversion and relies on the fact
that the set up errors of many users in many project will cancel each
In the output, the user is free to decide on which of the two processes
he prefers to rely. Can output the whole database, or lens/camera
The database is in the attachement, with a bit more analysis and a short
License is http://creativecommons.org/licenses/by/3.0/ - though this
code could be released in the public domain as far as I am concerned.
The value here is not the code, but the data in the database which takes
a lot of effort to collect and refine.
Comments and critique welcome.
enjoy the summer!
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