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static RGBImage scaleDownUsingIntegralImage(IntegralImage img, int w, int h) { int w1 = img.w, h1 = img.h; RGBImage out = new(w, h); for y to h: for x to w: { int x1 = x*w1/w, x2 = max(x1+1, (x+1)*w1/w); int y1 = y*h1/h, y2 = max(y1+1, (y+1)*h1/h); int area = (x2-x1)*(y2-y1); int r = integralImage_sumRect(x1, y1, x2, y2, 0)/area; int g = integralImage_sumRect(x1, y1, x2, y2, 1)/area; int b = integralImage_sumRect(x1, y1, x2, y2, 2)/area; out.setPixel(x, y, r, g, b); } ret out; }