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Re: 3D registration [message #53804 is a reply to message #53767]

Thu, 03 May 2007 08:34

Mike[2]
Messages: 99
Registered: December 2005

Member

On May 1, 1:25 pm, Bita <rahm...@sbox.tugraz.at> wrote:
> Hi,
> I would like to implement an affine transformation for 3D
> registration.
> I have done a linear rigid transfomation with T3D IDL-function,
> but how can I do the shear operations?

You can use t3d to incorporate translations, scaling, and rotations,
i.e.

t3d, /reset
t3d, translate=[dx,dy,dz]

Then you can multiply by a shear transformation "by hand" (without
t3d):

shear = [ [ 1, Sxy, Sxz, 0 ],
[ 0, 1, Syz, 0 ],
[ 0, 0, 1, 0 ],
[ 0, 0, 0, 1 ] ]
!p.t = shear # !p.t

I think I may be remembering the correct form for a shear
transformation, but don't take my word for it!

Mike

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[Message index]

		3D registration By: Bita on Tue, 01 May 2007 10:25
		Re: 3D registration By: Mike[2] on Thu, 03 May 2007 08:34

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