单相机几何量检测新方法

按照常规摄影测量,如果仅使用一台相机而要获取点的三维坐标则至少需要在2个不同的位置进行摄影.本文则提出了利用单台相机仅拍摄单像片,来对平面内的几何量进行检测的方法:借助一个带有3个以上基准长度的共面工装,来辅助计算原始图像与正射摄影图像的转换参数;使用上述转换参数,将原始图像转换为正射图像;由正射图像的相似比例关系,进行平面内几何量的检测.另外,通过实验验证了本文所述的单台相机测量原理及所达到的相关精度.

New method for geometrical shape acquisition using single camera

In conventional point of view, images must be taken from at least two different positions to acquire absolute 3D coordinates, if only one single camera is used. This paper puts forward a new method for geometrical shape acquisition using one single camera. The conversion parameters between original images and orthophotos are calculated using a coplane reference with more than three scale bars. With these conversion parameters original images are transformed into orthophotos. In the orthophotos, geometrical shapes can be measured based on similar relation. Experiment was carried out, which verifies the measurement accuracy of the proposed method.