A laser scanning graphic system for multimedia podium presentations Conference Paper uri icon


  • 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. 2004 Copyright SPIE - The International Society for Optical Engineering.

name of conference

  • Optical Scanning Systems: Design and Applications

published proceedings


author list (cited authors)

  • Gadhok, J., Belur, R., Strganac, T. W., & Junkins, J. L.

citation count

  • 0

complete list of authors

  • Gadhok, J||Belur, R||Strganac, TW||Junkins, JL

editor list (cited editors)

  • Beiser, L., & Sagan, S. F.

publication date

  • July 1997