Research on Sub-pixel Location of the Laser Spot Center

Laser has the advantages of high precision, being able to realize non-contact measurement, non sensitiveness to electromagnetic interference and so on, and so many measurement systems use laser technology as the auxiliary measurement means now. Yet precise location of laser spot center is a key issue of ensuring the measurement accuracy. This paper combined the average background model method with the curve fitting sub-pixel positioning algorithm of bar center to do the sub-pixel localization of laser spot center. First, the average background model method is used to extract the laser spot, and then the curve fitting sub-pixel positioning algorithm of barycenter is employed to calculate the sub-pixel coordinates of laser spot center. The simulation results show that the positioning accuracy can reach 0.1 pixels.