Finding blob centers with keypoints or centroids?

berak · August 14, 2021, 2:27pm

the keypoint center is already derived from the contour moments:

opencv/opencv/blob/917cd13ce24cd89770b78769d7bc9729277ff4c8/modules/features2d/src/blobdetector.cpp#L271

    
      
              double hullArea = contourArea(hull);
              if (fabs(hullArea) < DBL_EPSILON)
                  continue;
              double ratio = area / hullArea;
              if (ratio < params.minConvexity || ratio >= params.maxConvexity)
                  continue;
          }
          
          
if(moms.m00 == 0.0)
              continue;
          center.location = Point2d(moms.m10 / moms.m00, moms.m01 / moms.m00);
          
          
if (params.filterByColor)
          {
              if (binaryImage.at<uchar> (cvRound(center.location.y), cvRound(center.location.x)) != params.blobColor)
                  continue;
          }
          
          
//compute blob radius
          {
              std::vector<double> dists;

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Finding blob centers with keypoints or centroids?

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