Hao Gao, Tadayoshi Aoyama, Takeshi Takaki, and Idaku Ishii
Structured light, high-speed vision, DLP projector, real-time 3Dscanner, GPU, shape inspection
In this paper, we propose a self-projected structured light method that can reduce the number of projections for fast three-dimensional (3D) shape inspection even when there are large height differences in the measured 3D scene. In our method, multiple curved-stripe patterns generated by a reference 3D shape are projected onto the measured 3D scene, and 3D shapes can be obtained by processing multiple straight-stripe-like patterns projected in the camera view. Compared with the straight-stripe projections in most structured light methods, our self-projected structured light method can reduce the number of curved-stripe projections by facilitating fast processing and accurate acquisition of 3D shapes when a reference 3D shape is provided prior. We implemented our proposed method on a GPU-based high-frame-rate (HFR) structured light system that can obtain and process 512 × 512 depth images in real time at 500 fps, synchronized with an HFR projector. The effectiveness of our self-projected light system was demonstrated by means of several real-time experimental results measured at 500 fps.
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