该函数实现的是激光光斑中心检测。首先对光斑进行预处理，然后利用最小二乘法来拟合光斑，得到光斑的中心坐标以及光斑半径。-This function is implemented in the laser spot detection. First spot pretreatment, and then use the method of least squares fitting spot to get a spot center coordinates and the radius of the spot.