多站位CCD相机参数的标定方法研究

Study on multi-position calibration methods for intrinsic parameters digital camera

单站位的标定方法对于大视场的相机只能保证标定区域有很好的测量精度。为此,提出了多站位数字相机内部参数的标定方法。该方法将相机像面划分为若干个区域,规划相机的站位分布和位置姿态,确保所有站位下控制点能够分布相机整个像面,从而使标定的结果能够反映整个像面的畸变影响。多站位标定方法能够很好地解决单站位标定中被测点超出标定的区域时成像精度无规则变化的问题。实验结果表明:对基准尺在6个位置进行测量,多站位标定方法计算出的结果都可以保持在一定的水平上,不会出现单站位计算出的个别位置误差过大的情况。

Mono-position calibration method can merely guarantee the accuracy for a camera with the area of well calibration, so multi-position calibration methods for intrinsic parameters digital camera is raised. In this method, the image surface is divided into several regions, the distribution and location of the camera is programmed, and all control points can be as sured to distributed on the whole image surface, so that the calibrated results can show the influences of distortion of the whole image surface. The calibration of multi-position can solve the problem of the points, whose accuracy vary irregularly, while exceeding the calibrating regions, when they are being calibrated by the position. The result of the experiment has proved that while measuring six positions on the standard rule with multi-position, the calculating results can remain stable to some extent, rather than showing too many errors on some parts. Therefore, the application of multi-erect position for calibration is effective to solve the problem of the irregular variation of the accuracy of the image formation.