Telegraphy – Systems – Printing
Patent
1975-05-29
1976-12-14
Gruber, Felix D.
Telegraphy
Systems
Printing
35 12N, 178DIG22, 178DIG35, 235151, G09B 908, H04N 700
Patent
active
039966739
ABSTRACT:
An apparatus for generating computed images on an electronically controlled display surface is provided which uses a function module for generating the deflection voltages necessary to display a shape, the shape being defined in terms of right edge and left edge vectors. The vectors comprise line segments, placed end-to-end until a closed shape is formed. Each line segment is defined by a start point and slope to the next vector start point. The shape is constructed by sweeping the beam of a cathode ray device in an X coordinate direction and comparing the instantaneous X coordinate beam position with the instantaneous position of the left edge and right edge vectors. Upon the determination that the beam has passed beyond the coordinate position of the right edge or left edge vectors defining the image, beam intensity is blanked and the Y coordinate of the beam is incremented. Upon the determination that the beam has passed beyond the next coordinate position of the right edge or left edge vectors, and sufficient time has been allowed for the new Y position of the beam to become stable and for various computations to be completed, beam direction is reversed. Upon determination that the beam has passed within the next coordinate position of the right edge or left edge vectors respectively, new right edge or left edge values are generated and the beam intensity is again unblanked. The Y coordinate position of the beam is monitored and new vectors commanded whenever the Y ordinate of the preceding vector end is reached. Successive vectors are ordered until the desired, closed image is completed. Means also are provided for varying the intensity of the CRT display to permit CRT simulation of real time visual phenomenon.
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patent: 3422419 (1969-01-01), Mathews et al.
patent: 3497760 (1976-02-01), Kiesling
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patent: 3602702 (1971-08-01), Warnock
patent: 3787619 (1974-01-01), Wolff
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patent: 3878327 (1975-04-01), Uhler
Mackey John
Vorst Carl J.
Gruber Felix D.
Lucchesi Lionel L.
McDonnell Douglas Corporation
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