Accession Number:

ADD009895

Title:

Cursor Apparatus for Interactive Graphic Display System.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Report Date:

1982-10-12

Pagination or Media Count:

13.0

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 beams average position with respect to the center of the cursor.

Subject Categories:

  • Lasers and Masers
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE