The patented technology consists of a network of (overhead and/or underwater) cameras that are connected to a computer vision system that uses multiple overlapping views (epipolar geometry, fundamental matrix, essential matrix, etc.) to detect motionless bathers below the surface of the water in swimming pools.
An incident is detected within 10 to 15 seconds and the algorithms in the system allow to provide the lifeguards with a precise 3 Dimensional position of the person in difficulty.