IPP face detection with bottom-up image

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IPP face detection with bottom-up image

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I've found 2 applications in IPP samples that use IPP face detection: Face_Detection and picnic.

1) What is the difference between them in performance?
First processes images with more than 2**17 pixels in parts, the other does not differentiate larger images.

2) It uses flipped images around horizontal axis (that is bottom-up bitmap) and adjusts Haar cascade y coordinate accordingly. Is there specific performance reason to use bottom-up bitmaps instead of ordinary top-down?

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