摘要
为了满足多探测器拼接成像系统像素级精度的图像拼接要求,需要对各探测器的空间位置进行精确标定,构建了基于经纬仪角度补偿功能的高精度四维标定平台。平台由两个直线导轨和载物台搭建的二维平移台、改造式发光经纬仪和伺服控制器三部分组成。首先,由发光经纬仪提供无穷远目标源,发出带有十字丝的图案。然后,通过求解运动位移方程,控制二维平移台和经纬仪运动到指定位置,将十字丝分别成像在每个探测器靶面中心,完成各探测器的装调标定。最后,对标定平台的对准精度进行了误差分析。实验结果表明:二维平移台的安装误差在经纬仪的角度补偿范围内,四维标定平台的水平角和垂直角对准精度均高达5″,可实现多探测器拼接成像系统的精确标定。
In order to meet the pixel-level accuracy of image stitching for multidetector montage imaging system, the position of each detector should be ensured. A high-accuracy four-axis calibration table based on angle compensation of theodolite was established. The table consists of a two-axis translation stage including two linear rails and object stage, a reforming luminous theodolite and a servo controller. To align and calibrate the detector of any camera, the luminous theodolite is used to provide an infinite reticule, and then the table utilizes two-axis translation stage and theodolite to project the reticule into the detector center of any specified camera by solving the motion equations. The alignment accuracy of the calibration table is analyzed finally. The experimental results show that the installation error of two-axis translation is within the angle compensation range of theodolite, four-axis calibration table has an alignment accuracy of 5arc sec for both horizontal and vertical angle, which is able to calibrate any detector of muhidetector montage imaging systems accurately.
出处
《电子测量与仪器学报》
CSCD
北大核心
2015年第8期1187-1195,共9页
Journal of Electronic Measurement and Instrumentation
关键词
多探测器拼接
角度补偿
四维标定平台
对准精度
multidetector mosaic
angle compensation
four-axes calibration table
alignment accuracy
