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Detecting a pebble in videos

I would like to detect a pebble in videos, the image below is an example of how the pebble(s) look like. I would ideally like to detect and track the pebbles. What is the best approach to solving this problem?

image description

  • The approach needs to be computationally inexpensive as it needs to be able to run on a mobile device
  • The background will not be of a uniform colour - like it is in the image, the background will be dynamic
  • Only need to detect and track a single pebble
  • Don't want to use colour for detection as lighting conditions will be varied
  • I am able to obtain multiple images of the pebble for training purposes

Any help will be greatly appreciated.