Method and apparatus for detecting the location of a light sourc

Details Method and apparatus for detecting the location of a light sourc Method and apparatus for detecting the location of a light sourc

1997-03-24

1999-06-22

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

345157, 345179, G09G 508, G01B 1114

Patent

active

059147830

ABSTRACT:
In an audio/visual computer-generated presentation system in which material s presented to an audience through projection of the material to a screen, the position of a remotely-generated spot from a laser illuminator is detected by a so-called sensor which is positioned to detect light from the spot which is diffusely reflected off the screen along the portion of the optical path between the computer-driven light modulator and the screen, with the sensing of the position of the spot at the time of the generation of a selection signal being used to change the on-screen material. The on-axis sensor for detecting the light spot eliminates speed and accuracy problems associated with off-axis CCD camera detection, while at the same time providing a presenter with a robust method of selecting computer-generated material to be presented.

REFERENCES:
patent: 5138304 (1992-08-01), Bronson
patent: 5394183 (1995-02-01), Hyslop
patent: 5502459 (1996-03-01), Marshall et al.
patent: 5502514 (1996-03-01), Vogeley et al.
patent: 5502568 (1996-03-01), Ogawa et al.
patent: 5515079 (1996-05-01), Hauck
patent: 5654741 (1997-08-01), Sampsell et al.

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