Accession Number : ADD009895

Title :   Cursor Apparatus for Interactive Graphic Display System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Burns,Richard H ; Smith,Michael R ; Bell,Irving J ; Crabtree,Kenneth

Report Date : 12 Oct 1982

Pagination or Media Count : 13

Abstract : Graphic data entry in an interactive graphic display system is achieved by means of an apparatus that provides automatic centering of a pointing laser beam on a hand held cursor. The graphic display system provides a means for displaying and comparing through superposition full size overlaid graphical data and projected graphical data on a common display screen. It includes a steerable pointing laser the beam of which scans the display screen in response to a laser beam deflection circuit. The system also includes laser beam position sensing ad indicating circuits which accurately measure the laser beam position. Centering of the laser beam o the cursor at the display screen is accomplished by dithering the beam uniformly about its average position in a discrete dither pattern and utilizing the dither pattern to determine misalignment of the beam's average position with respect to the center of the cursor.

Descriptors :   *Patents, *Display systems, *Interactive graphics, Graphics, Light pens, Data displays, Computer graphics, Analog to digital converters, Input, Laser beams, Aiming, Inventions

Subject Categories : Lasers and Masers
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE