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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。
A method of optical coordinate measurement based on reverse photography is proposed. Measuring system mainly consists of miniature camera, measuring rod and liquid crystal display. One end of the rod fixed micro-camera, the other end is a trigger probe, liquid crystal display shows a two-dimensional sine fringe pattern. Measurement, the LCD screen is placed around the measured object, touch the probe touch the surface of the measured object, the camera uptake the streak image on the display. Through the phase information carried by the fringe pattern, the space coordinate and attitude of the camera’s main point in the world coordinate system are determined. The least square method is adopted to obtain the space coordinates of the probe in the camera coordinate system, and the probe can be obtained And the measured object points in the world coordinate system in the three-dimensional coordinates. The experimental results show that the method is simple and reliable, and can accurately obtain the optical coordinate measurement results.