Printed image for stitch calibration

[Ben Knill]

I'm attempting to use Hugin as a video stitcher (with FFMPEG) - this is going well, however I'm wondering if a rig could be calibrated by photographing something that is placed around the camera, i.e. a light box with the camera inside, with something printed on it that would make it really easy for Hugin to automatically find control points?  This is for a template that can be used for every frame in a video. 

I've used chess board style images for lens calibration before, and I'm only using 2 cameras and fisheye lenses so there is only one seam to stitch.  

Would something like this work but with different colours, numbers printed on etc? What does Hugin look for when it attempts to find control points? How can I print something to make it really easy on the control point finder? 

[Bruno Postle]

Hugin cpfind looks for features that are unique, so a chessboard
really confuses it. Also for calibration parallax is a big problem, so
it is much better to use a scene where the features are a long
physical distance from the camera, i.e. go outside and hold the rig
high above the ground.

The fine-tune function in the Control Points tab uses different code
altogether, this is happiest with corners - when manually picking
control points you should always be looking for corners - in this case
chessboard-like features are ideal.

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Bruno