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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.
>
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> 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

--
Sent from: http://octave.1599824.n4.nabble.com/Octave-General-f1599825.html

```