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RANSAC parameters

asked 2013-02-03 06:26:45 -0500

Bomber19 gravatar image

updated 2013-02-04 01:02:48 -0500

Hey, i'm using the RANSAC-Algorithm for estimating homography. The only parameter i can edit is the reprojection error threshold t. What are the values of the other parameters in OpenCV?

  • N --> number of trials
  • T --> threshold for the number of inliers
  • p --> probability that one of the random sample is free from outliers
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answered 2013-02-04 02:06:30 -0500

sammy gravatar image

These parameters are hardcoded. You can find them in modules/calib3d/src/fundam.cpp, line 222.

I won't discuss why they are hardcoded - just that for 99% of situations the defaults are best.

If you want more control over your homography, use cv::findFundamentalMat() - you can specify the algorithm and its parameters in great detail.

And if you still don't like it, fork OpenCV and tune it yo your needs.

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Asked: 2013-02-03 06:26:45 -0500

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Last updated: Feb 04 '13