Phase messaging method for time-of-flight cameras
Author(s)
Yuan, Wenjia; Howard, Richard E.; Dana, Kristin J.; Raskar, Ramesh; Ashok, Ashwin; Gruteser, Marco; Mandayam, Narayan; ... Show more Show less
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Ubiquitous light emitting devices and low-cost commercial digital cameras facilitate optical wireless communication system such as visual MIMO where handheld cameras communicate with electronic displays. While intensity-based optical communications are more prevalent in camera-display messaging, we present a novel method that uses modulated light phase for messaging and time-of-flight (ToF) cameras for receivers. With intensity-based methods, light signals can be degraded by reflections and ambient illumination. By comparison, communication using ToF cameras is more robust against challenging lighting conditions. Additionally, the concept of phase messaging can be combined with intensity messaging for a significant data rate advantage. In this work, we design and construct a phase messaging array (PMA), which is the first of its kind, to communicate to a ToF depth camera by manipulating the phase of the depth camera's infrared light signal. The array enables message variation spatially using a plane of infrared light emitting diodes and temporally by varying the induced phase shift. In this manner, the phase messaging array acts as the transmitter by electronically controlling the light signal phase. The ToF camera acts as the receiver by observing and recording a time-varying depth. We show a complete implementation of a 3×3 prototype array with custom hardware and demonstrating average bit accuracy as high as 97.8%. The prototype data rate with this approach is 1 Kbps that can be extended to approximately 10 Mbps.
Date issued
2014-05Department
Massachusetts Institute of Technology. Media Laboratory; Program in Media Arts and Sciences (Massachusetts Institute of Technology)Journal
2014 IEEE International Conference on Computational Photography (ICCP)
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Yuan, Wenjia, Richard E. Howard, Kristin J. Dana, Ramesh Raskar, Ashwin Ashok, Marco Gruteser, and Narayan Mandayam. “Phase Messaging Method for Time-of-Flight Cameras.” 2014 IEEE International Conference on Computational Photography (ICCP) (May 2014).
Version: Author's final manuscript
Other identifiers
INSPEC Accession Number: 14383061
ISBN
978-1-4799-5188-8