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2012-11-27 12:35:55 -0500 received badge  Teacher (source)
2012-11-26 08:11:45 -0500 answered a question Cascade Classifier in commercial app

It depends on country. Despite OpenCV itself is under BSD licence, some algorithms are patented hence there are limitation on using it in countries where algorithms can be patented (USA for example).

But Haar Feature-based Cascade Classifier seems to be free everywhere.

See for example:

2012-11-20 02:59:13 -0500 asked a question cv::PlanarObjectDetection in OpenCV 2.4.

Why PlanarObjectDetector is obsolete (moved to legacy in OpenCV 2.4)? What better to use instead?