Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Dan
Posts:
1
Registered:
7/29/14


2D Geometric Transformations
Posted:
Jul 29, 2014 7:05 PM


Would appreciate someone at Mathworks (or anyone) could point to the solution to my problem.
Matlab 2014a IPT has a chapter on 2D Geometric Transformations. It gives the transformation matrix for the 4 cases (Translation, Scale, Shear, Rotation) It mentions: "You can combine multiple affine transformations into a single matrix" Then, it shows a simple example using translation. My question is: how ca be a multiple (or combined) transformation matrix be obtained, say for a rigid transformation (translation, rotation, and scale).
The inverse problem is: having a tform (object of class affine2d) obtained from a registration, how can one calculate the registration parameters (tx, ty, theta, scale).
Sorry if this was answered. I was looking long and hard for an answer, but did not find any. It will be nice if Mathworks would add this functionality in next IPT.
Thanks a lot.



