Mosaics with a Copy Stand

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Michael Perry

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Oct 16, 2014, 1:41:01 PM10/16/14
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I stitch mosaics using Hugin. My camera is mounted to a copy stand and can slide in both X and Y and uses a (calibrated) Macro lens about 40cm above the artwork. 

I am convinced that I am not using the right optimisation processes in Hugin. The workflow is:

•  Optimise in x and y to get all the images in roughly the right place and spot cpfind Control Point errors (if any)
•  Optimise in all of y,p,r,x,y and v to bring down the errors

As the HFoV approaches some (arbitrarily) small value, optimisation is complete. That just seems a bit wrong.

•  Surely I should have a constant yaw, pitch and roll? One that is applied to all of the images (including the anchor image). After all the camera only moves in X and Y and the artwork is fixed.
•  Should I be using the Plane Yaw and Plane Pitch tools - but how?
•  Is the importance of the HFoV in achieving optimisation a reflection of panotools origins as a panorama tool?

Any thoughts would be much appreciated.



Bruno Postle

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Oct 16, 2014, 7:09:05 PM10/16/14
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On Thu 16-Oct-2014 at 10:41 -0700, Michael Perry wrote:
>I stitch mosaics using Hugin. My camera is mounted to a copy stand and can
>slide in both X and Y and uses a (calibrated) Macro lens about 40cm above
>the artwork.
>
>I am convinced that I am not using the right optimisation processes in
>Hugin. The workflow is:
>
>• Optimise in x and y to get all the images in roughly the right place and
>spot cpfind Control Point errors (if any)
>• Optimise in all of y,p,r,x,y and v to bring down the errors
>
>As the HFoV approaches some (arbitrarily) small value, optimisation is
>complete. That just seems a bit wrong.

You need an anchor image that has fixed values for XYZ, and there is
no need to optimise v if the photos are all parallel.

--
Bruno
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