[CREATE] Lens correction database

[Andrew Zabolotny]

From Fri, 7 Sep 2007 10:49:50 +0200
Cyrille Berger <cberger at cberger.net> wrote:

> First comment, it's just formating of the doc :D , it's easy to get
> lost between the C++ API and the C API, I was a little bit confused
> at first going from a C API then having C++ classes. Not a big deal.
Hmm, ok, I'll try to split the API into the C++ API group and the C API
group and will see if that helps. But alas, doxygen does not support
embedded groups, so it will be a flat strucure: "lenses for C", "lenses
for C++", "cameras for C", "cameras for C++" and so on.

UPD: I tried and imho it looks even worse :( I'll leave it as it is
now, until a more clever idea comes into my head.

> Reading http://cs.ozerki.net/zap/lensfun/doc/structlfLens.html , what
> is the best way to get the lens calibration data ? I would have like
> to have a function which either return me the closest solution or an
> interpolation, instead going throught the list in CalibDistortion and
> pick the closest to the focal.
I wasn't planning to make these functions public, but if you need them
I can put them into the public interface. But my main idea was to have
some "black box" object, this one:

http://cs.ozerki.net/zap/lensfun/doc/group__Correction.html

which will contain all the correction algorithms inside. When you
initialize it, you hand it a lfLens and it will interpolate everything
for you as well as it will prepare precomputed tables etc which will
help during image correction.

I can make some of these fields public (notably the interpolated
correction coefficients), so that if you want you may use them on your
own. But implementing 5 distortion algorithms in every client
application is not something I was meaning, I rather would like to see
them in one central place where they could be optimized (maybe even
implemented in asm for some platforms).

-- 
Andrew
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