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Re: Rotation matrix definition


From: Francesco Potortì
Subject: Re: Rotation matrix definition
Date: Thu, 21 Nov 2019 20:16:08 +0100

>> >I need to convert the translations + rotations from global coordinate
>> >system into a new coordinate system that is translated+rotated from the
>> >global one. How do I obtain that ?
>>
>> Load the 'image' package, and look at the tform functions:
>>
>>         cp2tform
>>         maketform
>>         tformfwd
>>         tforminv

>Thank you, I will check then, if you could please also indicate which one
>of these four you were intending?

Please answer below, not above, as is the custom of this list.

I used them long ago.  You read the help and you get it.  Essentially,
they are used for transforming a set of points in 2-D from5A one reference
system to a different one, with possible affine or projection
transformation.  You create a transformation matrix using maketform or
cp2tform and give this matrix as argument to either tformfwd or tforminv
depending on the transformation direction.

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