提出一种基于反向摄影的光学坐标测量方法。测量系统主要由微型摄像机、测杆和液晶显示器组成。测杆的一端固定微型摄像机,另一端是一个触发测头,液晶显示器上显示的是二维正弦条纹图。测量时,将液晶显示屏置于被测物体周围,触发测头接触被测物体表面,摄像机摄取显示器上的条纹图像。通过条纹图中所携带的相位信息确定摄像机主点在世界坐标系中的空间坐标和姿态,采用最小二乘优化的方法来获得测头在摄像机坐标系内的空间坐标,由此可以得到测头与被测物体点在世界坐标系中的三维坐标。实验结果表明,该方法简单、可靠,可以准确地得到光学坐标测量结果。

We present an optical coordinate measuring method using inverse photogrammetry. It mainly consists of micro-cameras,measuring rods and liquid crystal displays (LCD). One end of measuring rod is the fixed mini-cameras,on the other side is a trigger probe,LCD shows a two-dimensional sinusoidal fringe pattern. When measuring,the probe contacts the surface of the measured object,and then the camera captures the stripes image. The coordinates of camera principal point in the world coordinate system may be determined by the phase information that the fringe pattern carries. The relationship was determined between the principle point and the coordinates of the camera probes using least square optimization method. So that,the three-dimensional coordinate of the probe can be determined. The experimental results show that the method is simple,reliable,and can carry out optical coordinate with high precision.