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How to efficiently detect and track this marker?

Given the following images, I want to detect the location of the marker.

image description image description

  • GOAL: find center of marker
  • no scale or rotation required
  • 240x240 video feed running at around ~60fps
  • implementation should be as light-weight as possible
  • accuracy is not too important

What combination of OpenCV functionality would you recommend?

What I tried so far: - Detect contours, find rectangles and match them based on corners, this is too heavy though