Real-time composite pattern demodulation using optical correlators

Daniel L. Lau; Laurence G. Hassebrook; Thomas Lu; Tien-Hsin Chao

doi:10.1117/12.665902

19 May 2006 Real-time composite pattern demodulation using optical correlators

Daniel L. Lau, Laurence G. Hassebrook, Thomas Lu, Tien-Hsin Chao

Proceedings Volume 6220, Spaceborne Sensors III; 62200F (2006) https://doi.org/10.1117/12.665902
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Structured light illumination refers to a technique of acquiring 3-D surface scans through triangulation between a camera and a projector. Because traditional structured-light systems use multiple patterns projected sequentially in time, SLI is not typically associated with applications involving moving surfaces. To address this problem, the authors have introduced a technique referred to as composite pattern projection which involves the combining of a set of standard SLI patterns into a continuously projected pattern such that depth can be recovered from a single, captured image. As such, composite patterns can be used for tracking moving objects in 3-D space. The problem with composite patterns, though, is the added computational complexity associated with demodulating the captured image and extract the component SLI patterns. So in this paper, we introduce a means of achieving real-time pattern demodulation through the use of optical correlators with demonstrated results achieving a processing rate of over 100 frames per second.

Citation Download Citation

Daniel L. Lau, Laurence G. Hassebrook, Thomas Lu, and Tien-Hsin Chao "Real-time composite pattern demodulation using optical correlators", Proc. SPIE 6220, Spaceborne Sensors III, 62200F (19 May 2006); https://doi.org/10.1117/12.665902

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KEYWORDS

Composites

Spatial light modulators

Laser imaging

Cameras

Image processing

Video

Modulation

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