Laser scanning graphic system for multimedia podium presentations

Jagmohan S. Gadhok; Raghu R. Belur; Thomas W. Strganac; John L. Junkins

doi:10.1117/12.277749

7 July 1997 Laser scanning graphic system for multimedia podium presentations

Jagmohan S. Gadhok, Raghu R. Belur, Thomas W. Strganac, John L. Junkins

Proceedings Volume 3131, Optical Scanning Systems: Design and Applications; (1997) https://doi.org/10.1117/12.277749
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The present paper introduces new electro-optical sensing technology for electronic blackboard and related passive stereo measurement applications. The electronic blackboard enables real-time digitization of hand-written and hand-drawn information using a totally passive writing surface and writing instrument. Two resonant laser scanners sweep out a plane, the angular position of the two beams (at the instants that the beams are interrupted by the laser beams of a hand- held stylus such as a felt tip marker) are detected. These data are used to digitize coordinates along hand-drawn lines with high precision (approximately 1 part in 25,000) and digitization rates (approximately 160 Hz). The data input surface dimensions vary from small to large (permitting digitization on wall-sized writing surfaces as large as 2 meters by 6 meters) thus enabling a new family of applications. In particular, we discuss a novel application of this laser digitizing system to the automation of class or conference room presentations, and the authors describe a newly developed multimedia podium for classroom presentations. Other applications exist in emerging multi-media systems, manufacturing and robotics, large area digitizing for the drafting market, and automated note taking for the education market.

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Jagmohan S. Gadhok, Raghu R. Belur, Thomas W. Strganac, and John L. Junkins "Laser scanning graphic system for multimedia podium presentations", Proc. SPIE 3131, Optical Scanning Systems: Design and Applications, (7 July 1997); https://doi.org/10.1117/12.277749

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KEYWORDS

Laser scanners

Digital signal processing

Sensors

Mirrors

Signal processing

Laser systems engineering

Multimedia

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