Itseez/opencv — pull request #953 by jet47 (2013-06-05 10:11:53+00:00)
Title: Fixed Bug #3069 (infinite loop in GPU LBP Cascade detectMultiScale)

Related bug : http://code.opencv.org/issues/3069

The second parameter in PyrLevel constructor is `_scale`, so I suppose we mast pass `scaleFactor` parameter. `1.0f` value leads to infinite loop.