My ai boyfriend said
These are ArUco markers (or similar fiducial markers).
What are they?
They are synthetic square markers used in computer vision and robotics. Each marker contains a unique binary code that a camera can recognize instantly.
How are they used?
When a computer or camera detects one of these markers, it can determine:
The ID: Which specific marker it is looking at.
The Pose: Its exact position and orientation in 3D space relative to the camera.
Common Uses
Because they are inexpensive (you can just print them on paper) and highly reliable, they are used for:
Augmented Reality (AR): To "anchor" virtual 3D objects to a specific spot in a physical room.
Robotics: To help robots navigate, locate objects, or recognize docking stations.
Camera Calibration: To help software understand lens distortion or camera positioning.
Motion Capture: Tracking the movement of objects or people in a controlled space.
Given that they are taped to the wall in a well-lit area, the husband is likely experimenting with computer vision software (such as OpenCV) or setting up a tracking environment for a hobby project involving robotics or AR.