基于室外检校场的航空数码相机检校方法

Aerial Digital Camera Calibration Approach Based on Outdoor Calibration Yard

针对精确检校航空数码相机的应用需求,提出了一种基于室外检校场的航空数码相机检校方法。以共线约束方程为基础,首先详细推导了检校的数学公式;然后以实际的室外检校场为基础,进行数码相机检校实验。实验表明,检校过程收敛,且2组数据的相机检校结果较为吻合,证明了检校方法的可行性和有效性;由检校后所得的相机内外参数解算检查点的空间坐标,并与实测坐标比较,平面和高程中误差分别为0.039和0.170,证明检校结果具有较高的精度。

In view of the application requirement of accurately calibrating aerial digital camera ,an approach for calibrating aerial digital camera based on the outdoor calibration yard ia proposed .First-ly ,the mathematic formulas which are based on the collinear constraints are derived .Afterwards the calibration experiments are carried out based on the built outdoor calibration square .The calibration procedures converge well ,and the results produced from multiple groups of data are generally consist-ent ,demonstrating the effectiveness of the approach .The spatial coordinates of check points ,which are obtained according to the cameras＇intrinsic and extrinsic parameters ,are compared with their true values .The RMS errors in plane and altitude are respectively 0 .039 and 0 .170 ,demonstrating the high accuracy of calibration .