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// x1/y1/x2/y2 are dimensions of the inner (empty) part of the rectangle // w/h = line width/height static int bwIntegralImage_sumBorder(BWIntegralImage img, int x1, int y1, int x2, int y2, int w, int h) { ret BWIntegralImage_sumRect(x1-w, y1-h, x2+w, y2+h) -BWIntegralImage_sumRect(x1, y1, x2, y2); }