message: Fixed blob detector parameters range.
diff: @@ -83,8 +83,8 @@ public:
  if (p.thresholdStep <= 0)
  CV_Error(Error::StsBadArg, "thresholdStep>0");
  - if (p.minThreshold > p.maxThreshold || p.minThreshold <= 0)
  - CV_Error(Error::StsBadArg, "0<minThreshold<=maxThreshold");
  + if (p.minThreshold > p.maxThreshold || p.minThreshold < 0)
  + CV_Error(Error::StsBadArg, "0<=minThreshold<=maxThreshold");
  if (p.minDistBetweenBlobs <=0 )
  CV_Error(Error::StsBadArg, "minDistBetweenBlobs>0");
  