3D Coordinate Measurement using an Optical-Probe Single-Camera Vision System with an Initial Measuring Net

The single-camera vision measurement system based on an optical probe (a light pen) has been developed quickly and used widely in the field of 3D coordinate measurement because of its simplicity of operation, low costs, and portability. However, as the measuring space enlarges and requirements of measuring uncertainty grow, the limitations of the optical-probe single-camera 3D coordinate vision measurement system prevent it from satisfying requirements. Thus, an optical-probe single-camera vision method based on an initial net is proposed in this paper. We incorporate bundle adjustment, which is largely used in movable vision measurement. Using the proposed method, we applied a fixed-size optical probe to realize small- and large-scale measurements, maintaining the same accuracy. Experiments verified the feasibility of the proposed method.