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Using a larger chessboard for ROS stereo calibration ?

asked 2018-04-06 10:05:25 -0500

malharjajoo gravatar image

Hi,

I have been trying to calibrate (using chessboard pattern) a pair of stereo cameras using the ROS camera_calibration tool.

However, when I move the stereo cameras far apart (eg:- baseline > 30-40 cm ), I cannot get the "Size" bar to be filled completely green (please see the GUI images on the above link) even after placing the chessboard calibration pattern very close to the stereo camera.

I am currently using a simple A4 size printed paper (stuck on a rigid surface) for calibration.

My question: Has anyone used a larger calibration pattern (A3 , A2 , A1 ,A0 size ?) and got better calibration results ?

Thanks!

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answered 2018-04-06 12:15:26 -0500

ahendrix gravatar image

Yes. I've used large (roughly 1m) chessboard patterns for calibration on the PR2 with good results. (see http://wiki.ros.org/pr2_calibration/T... for pictures)

Keep in mind that if you change the chessboard size or number of squares, you'll also need to change the matching parameters to the calibrator node.

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Hi, thanks a lot for confirming and the reminder, I will try it out and soon..Not sure if this can work out for different setups of stereo cameras (I would like to place them as far apart, probably inclined towards each other to increase common field of view and then try to get a good calibration)

malharjajoo gravatar imagemalharjajoo ( 2018-04-06 12:51:30 -0500 )edit

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Asked: 2018-04-06 10:05:25 -0500

Seen: 203 times

Last updated: Apr 06 '18