Re: [Toon-members] tag tag/absorient.h src/absorient.cpp test/sim.cpp

[Gerhard Reitmayr]

I just updated the tag implementations with this algorithm. only for 3D but 
could easily be extended.

Gerhard

On 27 Jun 2011, at 17:06, Ryan Pavlik wrote:

> FYI: The Eigen matrix math template library (similar to toon and tag) 
> includes an implementation of the Umeyama algorithm.  
> http://eigen.tuxfamily.org/dox/group__Geometry__Module.html#ga8161fbeb4627372152bae900f89b5daa
> 
> On Mon, Jun 27, 2011 at 2:05 AM, Gerhard Reitmayr <address@hidden> wrote:
> Hi Pekka,
> 
> Thanks for the reference, I didn't know that paper. I will probably implement 
> it, as it will provide better guarantees. I have not seen a reflexion in real 
> life, but I can imagine that it may happen.
> 
> cheers,
>  Gerhard
> 
> On 27 Jun 2011, at 07:26, Pekka Paalanen wrote:
> 
> > On Sat, 25 Jun 2011 09:12:21 +0000
> > Gerhard Reitmayr <address@hidden> wrote:
> >
> >> CVSROOT:     /cvsroot/toon
> >> Module name: tag
> >> Changes by:  Gerhard Reitmayr <gerhard>      11/06/25 09:12:21
> >>
> >> Modified files:
> >>      tag            : absorient.h
> >>      src            : absorient.cpp
> >> Added files:
> >>      test           : sim.cpp
> >>
> >> Log message:
> >>      added estimating a similarity transform (se3 + scale) between
> >> two 3D point sets after Horn
> >
> > Hi,
> >
> > I see you refer to Horn. Are you aware of the paper by Shinji Umeyama,
> > Least-Squares Estimation of Transformation Parameters Between Two Point
> > Patterns, IEEE TPAMI 13(4), April 1991?
> >
> > I did not check your code nor which Horn's paper you refer to, but
> > Umeyama claims to avoid the problem of reflections in comparison to
> > Horn. IIRC the biggest difference is that Umeyama uses SVD instead of
> > eigenvalue decomposition.
> >
> > Just in case you might find it interesting.
> >
> >
> > Cheers.
> >
> > --
> > Pekka Paalanen, M.Sc. (Eng.)   LUT/IT, room 6505
> > doctoral student               http://www.it.lut.fi/project/rtmosaic/
> > address@hidden          http://www.iki.fi/pq/
> 
> --
> Gerhard Reitmayr
> Institute for Computer Graphics and Vision
> http://www.icg.tugraz.at/Members/gerhard
> tel: ++43 316 873 5082
> 
> 
> 
> 
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> 
> 
> -- 
> Ryan Pavlik
> HCI Graduate Student
> Virtual Reality Applications Center
> Iowa State University
> 
> address@hidden
> http://academic.cleardefinition.com

--
Gerhard Reitmayr
Institute for Computer Graphics and Vision
http://www.icg.tugraz.at/Members/gerhard
tel: ++43 316 873 5082