[Elphel-support] camera image undistortion rectification

[Gergely Debreczeni]

Dear Andrey and all,

 Sorry for returning back to your question so slowly, I was distracted with other issues.
 Unfortunately we still have the problem of the correctly calibrating the stereo camera. 

We have a MNC354-2 Stereo Camera with 353-70-50 f=5 mm C mount lenses.

What is the best toolkit / distortion model to calibrate these lenses ?
We have tried OpenCV stereo calibration utility, and now trying "Camera Calibration Toolbox for Matlab"
but none of them gives very good results. (By eye it looks ok, but disparity fails...)

For the calibration we used 25 stereo image of a big chessboard from different viewpoints.

Questions:
- Do you have specific suggestions how to track down the problem ?
- Is there somebody having similar lenses and managed to calibrate them successfully ?
- What typical errors one gets (order of magnitude of calibration parameter errors) ?

thanks a lot in advance for any help,
Gergely




________________________________________
De : support-list
Envoyé : jeudi 6 juin 2013 01:14
À : Gergely Debreczeni; Elphel List
Objet : Re: [Elphel-support] camera image undistortion rectification

Gergely,

That camera is not calibrated - it is just hardware that allows to capture synchronized pairs of images, so there is some shift, rotation and lens distortion. The easiest thing you can do to start - capture a pair of images that include fine details at large distance and then manually match the images, shift and rotation is the first thing to process.

What type of lenses did you get?

Andrey




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