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Viola Jones Algorithm:Detector Scaling

asked 2015-05-04 20:49:02 -0500

I am actually implementing parallel version of the whole algorithm from scratch. I am able to detect the faces of particular size from image by resizing it to appropriate value. But how exactly the scaling of detector has to be done to scan the faces of different sizes? Position and size of feature can be multiplied by scaling factor, there is no problem in that. But what about the threshold, which makes the criteria for a particular (weak) classifier to qualify a window as face or non-face.

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answered 2015-05-05 16:45:49 -0500

SR gravatar image

You should not scale the classification window but do a multi-scale search on the input image. That is, you incrementally downsize the input image while your classification window size is kept fixed.

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Asked: 2015-05-04 20:49:02 -0500

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Last updated: May 05 '15