Authors:
Avery Cole
1
;
Sheikh Ziauddin
1
;
2
and
Michael Greenspan
1
;
2
;
3
Affiliations:
1
Department of Electrical and Computer, Engineering, Queen’s University, Kingston, Ontario, Canada
;
2
Ingenuity Labs, Queen’s University, Kingston, Ontario, Canada
;
3
School of Computing, Queen’s University, Kingston, Ontario, Canada
Keyword(s):
Range Sensing, 3D, Structured Light, Procam.
Abstract:
A novel method is proposed to imperceptibly embed structured light patterns in projected content to extract a real time range image stream suitable for dynamic projection mapping applications. The method is based on a novel pattern injection approach that exploits the dithering sequence of modern Digital Micromirror Device projectors, so that patterns are injected at a frequency and intensity below the thresholds of human perception. A commercially available DLP projector is synchronized with camera capture at rates that allow a stream of grey code patterns to be imperceptibly projected and acquired to realize dense, imperceptible, real time, temporally encoded structured light. The method is deployed on a calibrated stereo procam system that has been rectified to facilitate fast correspondences from the extracted patterns, enabling depth triangulation. The bandwidth achieved imperceptibly is nearly 8 million points per second using a general purpose CPU which is comparable to, and e
xceeds some, hardware accelerated commercial structured light depth cameras.
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