for (std::vector<cv::KeyPoint>::iterator blobIterator = keypoints.begin(); blobIterator != keypoints.end(); blobIterator++)
{
std::cout << "size of blob is: " << blobIterator->size << std::endl;
std::cout << "point is at: " << blobIterator->pt.x << " " << blobIterator->pt.y << std::endl;
}