精密测角法的线阵CCD相机几何参数实验室标定方法

Calibration of geometric parameters of line-array CCD camera based on exact measuring angle in lab

建立了线阵CCD相机几何参数标定系统,对该标定方案所用的设备、实验条件、基于精密测角法的算法和精度进行研究。根据标定精度要求,确定了实验室主要测试设备和环境条件。利用高精度二维转台和CCD细分技术测得被标定系统的一系列视场角和对应像高。最后,利用建立的数学模型,应用最小二乘回归的方法,求得相机几何参数。误差分析结果表明:该方法对主距主点的标定精度可以达到μm级,相对畸变的标定精度可以优于1×10-4。该方法可以满足线阵相机的高精度几何标定要求,具有较高的实际应用价值。

A calibration system for geometric calibration of line-array CCD camera is established. The equipment, environment, algorithm based on exact measuring angle and calibration precision are investigated. According to the requirement of calibration precision, equipment and environment are confirmed. The field angles and image heights are tested by combining high-accuracy two-dimension turntable with CCD subdivision measurement. Finally, the geometric parameters of the camera are calculated by a least square regression analysis. The analysis results show that the calibration precision of principal distance and principal point have reached micron level and the calibration precision of relative distortion is smaller than 1× 10^-4. This method can meet the requirements of high precision calibration of line-array CCD and has higher practical application value.