message: Fix cleanFoundConnectedQuads.
diff: @@ -1256,7 +1256,7 @@ int ChessBoardDetector::cleanFoundConnectedQuads(std::vector<ChessBoardQuad*>& q
  Mat points(1, quad_count, CV_32FC2, &centers[0]);
  cv::convexHull(points, hull, true);
  centers[skip] = temp;
  - double hull_area = contourArea(hull, true);
  + double hull_area = contourArea(hull, false);
  // remember smallest box area
  if (hull_area < min_box_area)
  