Projected image light pen

Details Projected image light pen Projected image light pen

1990-08-02

1992-08-11

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340709, 358 93, G09G 302

Patent

active

051383047

ABSTRACT:
A technique for interaction with a projected video image with a light pen and/or target marks on the projection screen in which light reflected from the projected image is compared with the video image to detect the position of a spot positioned on the projected image by the light pen and/or the reflection of the target marks. The computer used to generate the video image is then caused to position a cursor in the video image in response to the spot position and/or otherwise modify the generated and/or projected video image.

REFERENCES:
patent: 3534359 (1970-10-01), Harris
patent: 3885096 (1975-05-01), Inuiya
patent: 4280135 (1981-07-01), Schlossberg
patent: 4371893 (1983-02-01), Rabeisen
patent: 4413314 (1983-11-01), Slater et al.

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