!7

static double[][] ii;

p {
  ii = integralImage(toBW(new RGBImage(10, 10, Color.gray)));
  printStruct(ii);
  checkRect(rect(1, 1, 2, 2));
  checkRect(rect(1, 2, 2, 2));
  checkRect(rect(2, 2, 2, 2));
  checkRect(rect(2, 3, 3, 3));
  haarFeature(rect(1, 1, 2, 2), rect(3, 1, 2, 2));
}

svoid checkRect(Rect r) {
  print("Expected: " + rectVolume(r)*0.5 + ", sum: " + iiSumRect(ii, r));
}

svoid haarFeature(Rect black, Rect white) {
  if (rectVolume(black) != rectVolume(white))
    fail("Unequal volumes: " + rectWithVolume(black) + "/" + rectWithVolume(white));
  double value = iiSumRect(ii, white)-iiSumRect(ii, black);
  print("Haar " + black + " with " + white + " => " + value);
}