Aiming at the problem of precision and stability of circle center extraction in the calibration of microfeature three-dimensional measurement system

an accurate ellipse center extraction algorithm is proposed. Firstly

Zernike orthogonal moments are used for sub-pixel edge detection

and then ellipse fitting is performed by block decomposition of matrix. According to the sub-pixel edge data points extracted before

the best ellipse parameters are calculated and the center is extracted. The calibration experiment is carried out by using Zhang Zhengyou’s plane calibration algorithm. The experimental results show that the algorithm has high precision

good stability and is easy to implement.