Wide angle lenses calibration with Opencv

asked 2013-11-21 08:37:26 -0500

Josep Bosch gravatar image

updated 2013-11-26 05:19:26 -0500

I'm using a wide-angle lens (178º Diagonal FOV ) and I'm trying to calibrate it properly using Opencv Calibration module. All the detection and calibration process are working fine, but the result is very poor.

I have tried many different configurations:

  • Different set of images
  • Different radial coefficient numbers: 2,3,4,5 even 6.(CV_CALIB_FIX_K1,...,CV_CALIB_FIX_K6 )
  • Fixing principal point and tangential disortion to 0 (CV_CALIB_FIX_ASPECT_RATIO, CV_CALIB_FIX_PRINCIPAL_POINT)
  • Using expected focal length as initial camera matrix. (CV_CALIB_USE_INTRINSIC_GUESS)

The best I can get is something like:Bad calibration

Any ideas about how could I get a good calibration? Do you think using two calibrattion patterns at the same time, or using a circles grid as calibration pattern would help?

I've tried as well the opencv 3.0 thin prism coeffs, but they didn't help.

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Comments

Hi @Josep, did you manage to solve the issue? I'm having the same problem with no clues...

caffarattig gravatar imagecaffarattig ( 2017-04-26 11:33:10 -0500 )edit