message: fix the bug, when k[4] is negative, icdist may be negative at the edge of image.
diff: @@ -480,6 +480,12 @@ static void cvUndistortPointsInternal( const CvMat* _src, CvMat* _dst, const CvM
  break;
  double r2 = x*x + y*y;
  double icdist = (1 + ((k[7]*r2 + k[6])*r2 + k[5])*r2)/(1 + ((k[4]*r2 + k[1])*r2 + k[0])*r2);
  + if (icdist < 0) // test: undistortPoints.regression_14583
  + {
  + x = (u - cx)*ifx;
  + y = (v - cy)*ify;
  + break;
  + }
  double deltaX = 2*k[2]*x*y + k[3]*(r2 + 2*x*x)+ k[8]*r2+k[9]*r2*r2;
  double deltaY = k[2]*(r2 + 2*y*y) + 2*k[3]*x*y+ k[10]*r2+k[11]*r2*r2;
  x = (x0 - deltaX)*icdist;
  