On Sun, Jun 2, 2013 at 7:30 PM, Torsten Bronger <
[email protected]> wrote:
> Hallöchen!
>
> 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.
jo
> http://wilson.homeunix.com/pc/impossible.jpg cannot be corrected at
> all, although at least a crop of the picture is correctable.
>
> Tschö,
> Torsten.
>
> --
> Torsten Bronger Jabber ID: [email protected]
> or http://bronger-jmp.appspot.com
>
>
>
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