摘要
为了解决大视场时间延迟积分(TDI)电荷耦合器件(CCD)相机静态传递函数(TF)测试过程中视场覆盖率不高、测试精度和效率较低等问题,设计了一种全视场静态TF自动测试系统。首先,将整个相机视场以TDI CCD为单元进行划分,移动转台调整TDI CCD对应视场与平行光管的位置关系,计算机接收相机采集的靶标图像,分析靶标图像特征并绘制TF变化曲线,根据TF变化曲线确定每片TDI CCD对应视场的最佳TF测试点,建立位置信息库。然后,计算机根据位置信息自动控制转台,分别移动到每片TDI CCD对应视场的最佳TF测试点,从每片TDI CCD第一个像元开始,以固定步长逐渐向最后一个像元移动,一边移动一边测试TF。最后,绘制大视场TDI CCD相机整个视场的静态TF曲线。实验结果表明:静态TF测试系统覆盖了相机整个视场,测试的静态TF平均值为0.2965,和以前测试方法比较,整个视场的静态TF平均值提高了0.02,同时提高了静态TF测试的精度和效率。
In order to solve the problems that the coverage rate of visual field is not high and that the test precision and efficiency are lower in the course of testing static transfer function（TF） of the big visual field time-delayed integration（TDI） charge coupled device（CCD） camera,a kind of automatic test system for static TF is designed.First,taking TDI CCD as unit,entire visual field of camera is divided.Then revolving stage is moved and the location relation of TDI CCD is adjusted corresponding visual field and the parallel optical pipe.Computer receives the target mark image acquired by camera,analyses target image feature and draws TF change curves.From these curves,the best TF test points of each slice of TDI CCD corresponding visual field are defined and location information storehouse is established.Then according to location information,the revolving stage is automatically moved to the best TF test point of each slice of TDI CCD corresponding visual field.Beginning from the first pixel of each slice of TDI CCD,it is moved to the last pixel gradually with regular step.When it is moving,it tests TF.Finally,static TF curve of entire visual field of the big visual field TDI CCD camera is drawn.Experimental results indicate that the test system of static TF has covered the entire visual field of camera.The tested average of static TF is 0.2965.Compared with the previous test method,the average of static TF of entire visual field has raised 0.02.At the same time,the test system has also raised test efficiency and test precision of the static TF.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第11期3171-3176,共6页
Acta Optica Sinica
基金
国家863计划(863-2-5-1-13B)资助课题
关键词
成像系统
静态传递函数
传递函数变化曲线
时间延迟积分电荷耦合器件
矩形靶标
imaging systems
static transfer function（TF）
TF change curve
time-delayed integration（TDI） charge coupled device（CCD）
rectangular target
