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Best calibration pattern for accuracy

asked 2013-03-27 03:50:24 -0500

BeLioN gravatar image


I have read opinions with different arguments saying either that chessboard calibration patterns or dotted calibration patterns can help improving the accuracy (considering the same camera and same type of images used).

Do you have reliable information pointing out which one can help accuracy, if it makes a real difference?

Thank you

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answered 2013-03-28 09:28:29 -0500

AgentCain gravatar image

I've tried both methods and I believe that the circle pattern is more accurate than the square one, judging the rms error after calibration. Should I need to explain it, I would bet on the pattern morphology itself. A square is more likely to be distorted while moving around than a circle due to camera focus. A circle tends to stay pretty much the same, regardless of camera focus, whereas a square will loose its corner sharpness. I prefer using the circles pattern, which yields better results on stereo correspondance.

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Asked: 2013-03-27 03:50:24 -0500

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Last updated: Mar 27 '13