摘要
摄像机标定是计算机视觉中的一个重要过程。大视场摄像机标定中,大尺寸靶标加工困难,而使用单一小靶标只能得到局部最优解。本文针对这一问题,提出一种基于小尺寸靶标组合的大视场摄像机标定方法。利用摄像机多项式投影模型,通过差分式求解方法将各个小尺寸靶标组合成一个大尺寸靶标,然后使用大尺寸靶标对大视场摄像机进行精确标定;在小尺寸靶标组合过程中,为了消除利用差分式方法进行求解时各个小尺寸靶标间只能平移、不能旋转的安放限制,提出了一种基于交比不变性的直线夹角求解方法,并设计了相应的复合靶标,提高了方法的灵活性。仿真和实际的实验结果表明,本文所提方法能够实现对大视场摄像机的精确标定。
Camera calibration is an important process in computer vision. For the issue that a large scale target is hard to fabricate,while using a small target can only get the local optimal results in the calibration of camera with large field-of-view, a calibration method based on spliced small targets is proposed. In this method, small targets are spliced into a large scale target through camera polynomial projective mod- el using difference solution. High precision calibration of camera with large field-of-view is then conduc- ted with the spliced large scale target through traditional calibration approach. At the same time, in order to eliminate the restriction that small targets only can translate, not rotate when using difference solution to splice them,a method to solve the angle between two straight lines based on invariance of cross ratio is proposed, while respective composite target is designed, which makes the method proposed in this pa- per more flexible. Feasibility and stability of the method in this paper are verified through simulation and experiments. The experiment results show that the method proposed in this paper can achieve the high precision calibration for camera with large field-of-view.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第8期1569-1575,共7页
Journal of Optoelectronics·Laser
基金
中央高校基本科研业务费专项资金(HIT.NSRIF.2014019)
关键词
机器视觉
大视场摄像机标定
多项式投影模型
小尺寸靶标
machine vision
calibration of camera with large field-of-view
polynomial projective model
small target
