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Re: find rotation between two images [message #40846 is a reply to message #40702] Wed, 01 September 2004 18:01 Go to previous messageGo to previous message
R.G. Stockwell is currently offline  R.G. Stockwell
Messages: 363
Registered: July 1999
Senior Member
"Tobi" <tbeetz@yahoo.com> wrote in message news:7f0cc27.0409011354.45cce42f@posting.google.com...
> i have several images where i would like to find the rotation and
> shift compared to a reference image. i use an alignment routine to
> seperate the shifting part. however, there is still the remaining
> problem of image rotation. is there a routine available? thanks!

Cool problem! Ignoring scale (zoom) problems and assuming the shift of
the center of rotation is in the middle (since you did the shift already),
to find a rotation between images I'd
1) clip the corners (since they presumably will not show up in
the rotated image) leaving a circular image.
2) find the edges using a canned routine (with a high threshold) for both
3) then calculate the Radon transform of the edge image for both.
4) read off the angle of particular lines for both, and subtract the two

Cheers,
bob

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