Bill,
As an alternative to silk screening you might look at vinyl printing. It can be printed and then a transfer sheet can be used to accurately lay it down. And there are a lot of places with the ability to cut vinyl.
Tully
On Tue, 2010-11-16 at 18:35 -0800, Radu Bogdan Rusu wrote:Ivan gets the credit for this, I just helped with the rubber cement.
> Hi Bill,
>
> Great work!
The glass we are using is slightly reflective to IR but it is
> A few suggestions:
>
> * use a larger calibration pattern that covers more of the image
> * use a calibration pattern with more squares
manageable. However, the transparency film we are using to make the
squares is much more reflective and we had to cut out the individual
black squares. We are probably going to look at silk screening the
pattern on to a larger sheet of glass to improve alignment.
We will make a bag file of our calibration tests tomorrow to help move
> * if the estimates of the corners (after subpixel refinement) are still bad, an iterative fitting process (or LMedS or
> RANSAC) could help
this forward.
Can this code be made available somewhere so we can test it before
> Alternatively, a calibration plate with circles would be better. We already have code ready that we need to commit for
> finding out centers of circles/ellipses and using those for calibration plates a la
> http://www.mvtec.com/halcon/applications/imgs/3d-vision-example-3d-calibration01.png, so this might improve things.
resorting to silk screening?
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