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## Re: Transform Matrix from sets of points

**From**: |
Pantxo |

**Subject**: |
Re: Transform Matrix from sets of points |

**Date**: |
Mon, 2 Oct 2017 06:46:12 -0700 (MST) |

Mirea Andrei Marian wrote
>* Hello Octave Community!*
>* I haven't used Octave since I graduated College and even letting*
>* "downtime" aside I wouldn't know how to approach it.*
>* I was hoping Octave had a function for outputting the transformation*
>* matrix, affine or otherwise (projective (conformal or otherwise)), by*
>* providing input of 2 or 3 sets of points. My guess is no but who knows?If*
>* not, how would I go about it for mapping points from a projected curved*
>* space or at least a plane space, onto a plane (projection plane)?Note that*
>* I don't know the nature of the curved surface or the orientation of the*
>* plane to be projected. All I have is a set of points on the projected and*
>* its corresponding set on the projection surface, respectively.*
>* Any help is warmly appreciated.*
>* *
>* _______________________________________________*
>* Help-octave mailing list*
>* Help-octave@*
>* https://lists.gnu.org/mailman/listinfo/help-octave*
Hi,
If your aim is to map points in one 2D space to another 2D space, then you
may find "cp2tform" useful:
https://octave.sourceforge.io/image/function/cp2tform.html
The function can't handle arbitrary transforms but the most common ones are
present including 2nd to 4th order polynomial.
Pantxo
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