A High-Speed 3D Shape Measurement System Using a Multi-Sided Mirror

Abstract

In this paper, the authors propose a new concept for high spatial resolution 3D shape measurement based on the light-section method by setting a multi-sided mirror between an image sensor and measured object. The authors developed a prototype system for 3D measurement based on a high-speed vision hardware, which can process a 1024×1024 pixel image at 1000 fps, and evaluated its effectiveness by showing the experimental results for a printed circuit board.

A Self-Projected Light-Section Method for Fast Three-Dimensional Shape Inspection

“…For recent improvement of the integration technology, many high-speed vision systems, such as vision chips (Bernard, Zaridovique, and Devos 1993;Eklund, Svenson, and Astrom 1996;Komuro, Kagami, and Ishikawa 2004) and FPGA-based vision systems (Hirai et al 2005, Watanabe, Komuro, andIshikawa 2007;Ishii et al 2009) have been developed for real-time video processing at frame rates of 1,000 fps or more. In particular, many high-speed smart sensors (Sugiyama et al 2002;, Oike, Ikeda, and Yamamoto et al (2007) developed a high-speed vision system to measure 3-D shapes of planar objects at 1,000 fps in a wider measurement range than the spatial resolution of the image sensor by setting a multisided mirror between the image sensor and the measurement object.…”

Phase unwrapping of fringe images for dynamic 3D measurements without additional pattern projection

“…To avoid motion artifacts, the time of simultaneously pattern projection and image acquisition needs to be decreased significantly. This could be realized by the usage of high-speed hardware, as proposed by Yamamoto et al, 1 Schaffer et al 2 and Heist et al 3 Otherwise, the number of diverse projection pattern has to be reduced. [4][5][6][7] Minimal motion effects are achieved by the reduction to only one pattern projection.…”