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False negatives in Face Detection

asked 2016-02-19 04:35:56 -0500

Mustansar Saeed gravatar image

Hi,

I have integrated OpenCv For Android successfully but the problem is it also shows false negatives. Sometimes it show faces when there is not. I have tried to set the setMinFaceSize to .5, .4,.3.2 all shows fase negativs, How to eradicate false negatives?

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there is a minNeighbours param in the detectMultiScale() call. increase it (like, 3,4,5,6), until you start losing positives.

berak gravatar imageberak ( 2016-02-19 04:40:15 -0500 )edit

But be aware that avoiding false positives on frame by frame basis is near impossible unless your application is very constrained. A good solution to that is to take into account time and average over 10 frames for example. That works for my application.

StevenPuttemans gravatar imageStevenPuttemans ( 2016-02-19 06:19:31 -0500 )edit

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answered 2016-02-19 17:27:23 -0500

sarmad gravatar image

How the average of 10 frames is calculated ?

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Asked: 2016-02-19 04:35:56 -0500

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Last updated: Feb 19 '16