title: Blob ID matching over multiple frames in C++ (image analysis)
body: <p>I'm working on a blob matching and tracking library in C++. Currently I'm using <strong>OpenCV</strong> to detect blobs and try to match blobs in a new frame by checking the position, velocity and size of the blob. This works quite okay and I'm receiving a high blob match rate (95% or higher).</p>
  
  <p>Sometimes blobs fall out of the image or new blobs appear. Now I need to give matched blobs the same ID as they had before. I'm wondering if there are typical or commonly used techniques for doing this. Or even some keywords I can use to Google on.</p>
  
  <p>Thanks</p>