An aruco marker is a square marker composed by a certain number of bits that corresponds to a specific id. The complete ArUco marker with the black border is essential for its detection. The size of the ArUco markers can vary with 5x5 that will consist of 25 bits.
The ArUco markers can be visualized as seen below. A user can define what ID they require and the corresponding ArUco marker will be generated.
OpenCV has a library that detects and generates ArUco markers, the link to the documentation can be found here.
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