[magick-users] Interpolate from 2 Images

[Anthony Thyssen]

On Wed, 3 Jun 2009 09:12:24 -0700
Fred Weinhaus <fmw at alink.net> wrote:

| You would need to use -resize not scale and 
| change the size of both images to match perfectly 
| (that is unfortunately an issue) and then 
| composite -blend them together.
| 
| The problem is that just resizing will not make 
| them match pixel-for-pixel and you will get an 
| image doubling.
| 
| Unfortunately, IM does not have an image 
| registration function, yet. But that would then 
| require picking many control points and IM does 
| not have that feature either.
| 
| You could look at ImageJ and some of its plugins. In particular,
| 
| http://rsb.info.nih.gov/ij
| http://rsb.info.nih.gov/ij/plugins/
| http://bigwww.epfl.ch/thevenaz/pointpicker/
| http://biocomp.cnb.uam.es/~iarganda/bUnwarpJ/
| 
| 
However if you can pick corresponding control points.  Preferably
down to a 'sub-pixel' level that many auto-mated image registration
programs can do.  Then IM can use -distort to align the two images
at the right scale, rotation, and translation   (using 'affine' or
'perspective').

NOTE: When making pixel selections, you need to give coordinates as the
'middle' of that selected pixel's area, as a floating point number.

That is, to select pixel 4,5 (as integers) then the correct 'sub-pixel'
coordinate should be 4.5,5.5 within the image,  this is the coordinate
that should be input as a control point.



  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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