3D Position Detection Using a 2D PSD and a Marker Composed of Light Sources

Abstract

In recent years, three-dimensional (3D) measurement is used in various fields. However, the con- ventional 3D measurement method has various problems such as complicated preset, slow processing and high price. In order to achieve 3D measurement with simple preset, high speed processing and low price, we propose a 3D measurement method based on a new principle in this study. It consists of a two-dimensional (2D) Position Sensitive Device (PSD) camera and a marker composed of two light sources paralleled to the PSD. The major merits of the proposed method are simple preset, high speed processing and low price. In addition, the proposed method is not influenced by the reflectance of the object. We performed experiments of four types to verify the measurement accuracy, compared the experimental result of accuracy standard with the experimental results in the case of setting wide interval of light sources, using the high luminance light sources and controlling the photographing magnification. From four experiments, we show that the proposed method is an e ff ective 3D measurement method and measurement accuracy is largely improved by three proposed solutions.