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Resolution and camera calibration

asked 2013-01-30 06:14:23 -0500

NightLife gravatar image

Hey guys, I have a conceptual problem in the field of camera calibration.

If I reduce the resolution of images(the chessboard images and the images that should aplly to algorithm for final results), the calibration algorithm works normally?

Thanks

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answered 2013-01-30 23:04:37 -0500

mgb gravatar image

Yes if you scale down the calibration images and the final images in the same way then everything cancels out.

You can also do the calibration at full resolution and then scale down the images - you just have to scale some of the calibration factors, fx,fy,cx,cy and the distortion values by the same factor.

Trickier is using a sub region of the calibrated image, the undistort is based on radial terms from the center so you need a little more 'finesse'

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Thanks, but my problem is that with high resolution images, the openCV can not find the corners to do the calibration. do you have any Idea about this problem?!!!!

NightLife gravatar imageNightLife ( 2013-01-31 02:08:38 -0500 )edit

Try adding a thick white border to the chessboard. I find this helps to improve the detection.

LostStar gravatar imageLostStar ( 2013-02-04 21:18:23 -0500 )edit
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Asked: 2013-01-30 06:14:23 -0500

Seen: 1,109 times

Last updated: Jan 30 '13