期刊
OPTICS AND LASERS IN ENGINEERING
卷 107, 期 -, 页码 176-181出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2018.03.030
关键词
High dynamic range; Structured light; Binary defocusing technique; Real-time; Dark period
类别
资金
- startup fund of Iowa State University
- National Natural Science Foundation of China (NSFC) [61603360]
This paper introduces a novel method for 3D shape measurement of high-contrast surfaces in real-time by taking advantage of the transitioning state of digital micromirror device. We propose to project defocused 1-bit binary patterns for sinusoidal generation to bypass the rigid camera-projector synchronization requirement. Each pattern is capture twice in one projection cycle to obtain two fringe images with different brightness: the first fringe is captured when the camera is totally exposed within the projector's bright period; the second fringe is captured when part of the projector's dark period is within the camera exposure. The two fringes will be combined to alleviate the saturation problem. Experiments demonstrate the success of the proposed method by showing the real-time 3D shape measurement capability (image acquisition rate: 166 Hz; 3D frame rate: 14 Hz). Moreover, since 1-bit binary patterns are used, it is potentially applicable to high-speed measurements.
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