基于直线成像特征的视觉测量系统综合标定方法

针对视觉测量系统存在复杂系统误差的特点,提出一种基于直线成像特征的系统综合标定方法,有效地保证了测量精度.该方法通过对1等量块的平行直线边缘提取,建立量块边缘空间物点位置和像点位置的原始对应关系,利用量块边缘的理想直线特征,通过统计计算对测量系统进行综合标定,建立描述空间物点位置和像点位置的相互对应关系的二元三次标定函数.对在测量范围内不同方位的量块进行多次测量,表明使用这种标定方法标定的视觉测量系统的测量精度能够达到.

Vision measurement system comprehensive calibration based on linear imaging characteristics

Aimed at the features of various system errors in vision measuring system, the paper proposed a comprehensive system calibration method based on linear imaging characteristics with measurement accuracy, According to the extraction of parallel linear edges of 1 grade gauge blocks, the original correspondence between the space point positions and the image point positions of the edges is built. Using the ideal linear features of gauge block edges, comprehensive calibration of measurement system is carried out through statis- tical calculation, and a two-parameter second-order polynomial which describes the corresponding relation between the space point positions and the image point positions is established. Adopting the general engineer- ing gauge block as the calibration tool, the calibration method is simple to operate and is easy to realize and has good versatility. It can comprehensively correct all kinds of system errors such as the optical distortion, the perspective error, the sensor position error and location error of edge detection algorithm. Bythe calibra- tion method, multiple measurement experiments of different azimuth gauge blocks in the field show that the precision of the measurement system can reach.