Wang Zemin

A fast on-site calibration method designed based on hierarchical coupled discrete mathematical model

Abstract For re-calibration all parameters if the sites layout changing, a fast on-site calibration algorithm for dual linear CCD intersection measuring system is designed, which can avoid invariant parameters re-calibration when the measuring system is moved. The measurement model of this system expresses the mathematical relation between output variables of the target coordinates and input variables of sites layout parameters as well as pixel coordinates. In accordance with the stability of interior parameters of the linear CCD camera, considering the stability of some external parameters, these stable parameters are coupled to a certain degree, which can reduce the calibration parameters number, and improve the speed of the calibration process. According to the coupling parameter, hierarchical mathematical model about the input variables, the coupling parameters and output variables is established, and target coordinates resolved mathematical model with changing site layout parameters is established, which can realize the fast on-site calibration for measuring system. The experiment results show that the calibration precision of proposed method meet the practical requirement of dual linear CCD intersection measuring system.