激光照射性能测量中异源相机的标定方法

Calibration of Different-source Cameras for Laser Irradiation Performance Measurement

激光照射性能测量相机包括可见光相机和近红外相机,可完成激光照射器照射精度立靶成像测量。可见光相机用来拍摄运动靶板,近红外相机用来拍摄照射激光。为解决在测量过程中卡塞格林光学系统使图像产生畸变和两个相机光轴不严格一致问题,在远距离测量中忽略透视误差的影响,对张正友相机标定方法进行改进,使相机内参数中扭曲因子为0,实现相机标定;根据可见光相机和近红外相机成像面的空间透视关系,实现双相机轴线一致性标定。实验结果表明:可见光相机标定的重投影误差为0.08像素,近红外相机标定的重投影误差为0.19像素,相机配准轴线一致性精度为0.37μrad,满足激光照射器照射精度外场测试中的需求。

Measuring cameras,including visible light camera and near-infrared camera,are used for imaging measurement of vertical target illuminated by a laser irradiator.The visible light camera is used to capture moving targets,and the near-infrared camera is used to take laser irradiation.For the problem that the cassegrain optical system makes the image distorted during measuring and the optical axes of two cameras are not strictly consistent,the influence of the perspective error is neglected in the long-distance measurement,Zhengyou Zhang camera calibration method is improved,so that the distortion factor in the camera parameters is zero and the camera calibration is realized.A near-field calibration method for camera far-field imaging is proposed.According to the spatial perspective relationship between the imaging planes of visible light camera and near-infrared camera,a dual camera axis consistency calibration method is proposed.The re-projection error of visible light camera calibration is 0.08 pixels,the re-projection error of near-infrared camera calibration is 0.19 pixels,and the camera registration axis consistency accuracy is 0.37μrad,which meet the needs of laser irradiator irradiation accuracy field test.