On Sun, Jun 2, 2013 at 1:03 PM, Torsten Bronger <
[email protected]> wrote:
> Hallöchen!
>
> johannes hanika writes:
>
> > On Sun, Jun 2, 2013 at 7:30 PM, Torsten Bronger <
> > [email protected]> wrote:
> >
> >> johannes hanika writes:
> >>
> >>> the keystone correction formula uses a perspective correction
> >>> approach (i.e. image plane x and y shortening is proportional to
> >>> 1/z in 3d and different for every pixel, much like
> >>> http://en.wikipedia.org/wiki/Texture_mapping#Perspective_correctness).
> i
> >>> don't see why you would need additional constant scaling?
> >>
> >> If I apply keystone correction to the plane of the lower-level
> >> piano keys in <http://wilson.homeunix.com/pc/before.jpg>, the
> >> result is <http://wilson.homeunix.com/pc/after.jpg>. Thus, the
> >> aspect ratio of the piano keys is not correct. Even worse,
> >
> > what do you mean, correct?i think i don't understand what result you're
> > after here.
>
> I want to have it like this:
>
so you want inverse texture mapping? the current thing just removes the
perspective, essentially giving you an ortho camera instead of a
perspective one.
(all those pictures look horrible btw).
-jo
> http://wilson.homeunix.com/pc/correct.jpg In this case, the aspect
> ratio of the piano keys is approx. 1:6.2, which is the same as if
> you take a picture with the sensor parallel to the piano keys plane
> like here: http://wilson.homeunix.com/pc/frontal.jpg
>
> In other words, a chessboard photographed with a tilt angle should
> be transformed into a chessboard with *squares* rather than
> rectangles.
>
> Tschö,
> Torsten.
>
> --
> Torsten Bronger Jabber ID: [email protected]
> or http://bronger-jmp.appspot.com
>
>
>
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