Jaccard Coefficient

float JaccardsCoefficient(Rect r1, Rect r2) { Point tl1 = r1.tl(), tl2 = r2.tl(); int xOverlap = max(0, min(tl1.x + r1.width , tl2.x + r2.width ) - max(tl1.x, tl2.x)); int yOverlap = max(0, min(tl1.y + r1.height, tl2.y + r2.height) - max(tl1.y, tl2.y)); float intersection = (float) (xOverlap*yOverlap); float union_area = ((float)(r1.area() + r2.area())) - intersection; return (intersection / union_area); }