About OpenCV Haar Cascades: Calculation and retrieval of x, y, w, h values for the bounding rectangle for face detection

Python
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code is here, gl parsing it …

no, srsly, – read the fine paper, say something like: ah, integral images !

… and then move on, QUICKLY !
ssd/yolo like cnns have superseded this technique,
it may not even be partof the future opencv api …