Structured Light

Seeing 3D in a whole new light…

Structured light illumination (SLI) is the process of projecting a series of light striped patterns onto an object while a digital camera records the deformation in the patterns to reconstruct a 3-D model of the object’s surface. In the past, SLI has not been used for video applications because of the very high frame rate needed. Based on the complexity of the calculations, video-based SLI systems have been required to record camera frames to memory and then apply off-line processing in order to reconstruct depth.
A list of references to Dr. Lau’s work in biometrics includes the following:

C. Guan, L. G. Hassebrook, and D. L. Lau,“Composite structured light pattern for three-
dimensional video,” Optics Express, vol. 11, no. 5, March 2003, pp. 406-417.

K. Liu, Y. Wang, D. L. Lau, Q. Hao and L. G. Hassebrook, “Lookup Table Based High- speed and High-quality Structured Light Illumination 3-D Reconstruction,” Optics Express, vol. 18, no. 5, March 1, 2010, pp. 5229-5244, DOI: 10.1364/OE.18.005229.

D. L. Lau, K. Liu, and and L. G. Hassebrook, “Real-Time Three-Dimensional Shape Mea- surement of Moving Objects without Edge Errors by Time Synchronized Structured Illumination,” Optics Letters, vol. 35, no. 14, July 15, 2010, pp. 2487-2489. DOI: 10.1364/OL.35.002487.

Y. Wang, K. Liu, Q. Hao, X. Wang, D. L. Lau, and L. G. Hassebrook, “Robust Active Stereo Vision Using Kullback-Leibler Divergence,” IEEE Transactions on Pattern Analysis and Machine Intelligence, July 30, 2011, DOI: 10.1109/TPAMI.2011.162.