Algorithm of laser spot detection based on optimal arc

Laser spot detection is the key technique used in optical measurement, and widely used in optical measurement system, optical automatic alignment system and laser communication target tracing. In order to improve the optical measurement and anti-interference of spot center and radius, a kind of laser spot center detecting algorithm was put forward based on the optimal arc, according to the symmetry of a circle, the algorithm overcame the interference edges, and then selected the arc with good sysmmetry as the optimal arc to provid the fitting data, calculated center and radius of a circle by using the least squraes method. And it was compared with other commonly used algorithms. Experiments show that the proposed algorithm has high orientation precision for the center and radius, fast speed, and can improve the anti-interference of testing center. The algorithm is suitable for real-time detection.