Digital display system

Details Digital display system Digital display system

1983-04-25

1986-09-16

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340723, 340728, 340744, 340747, G09G 100

Patent

active

046125400

ABSTRACT:
The system displays linear features on a gray-scale or other multiple-intensity display device with greater apparent smoothness by selecting the intensities of picture elements in the neighbourhood of the feature in dependence on their closest distances to the feature. Straight lines are generated by a vector generator (4) which conducts scans across the line. The closest distance from the picture element currently reached by the scan to the center of the line is held in an accumulator (18), which at each step of the scan is incremented or decremented from a register (20 or 21) holding the change in the distance. Each scan is terminated when a comparator (26) indicates that the intensity has reached that of the background. This scanning technique allows lines of varying width to be displayed easily. The position of the picture element along the line is held in an accumulator 19, used to address a table (22) holding the width at that point. A similar scanning technique is used in a circle generator.

REFERENCES:
patent: 3870922 (1975-03-01), Shutoh
patent: 3984664 (1976-10-01), Berwin
patent: 4158200 (1979-06-01), Seitz et al.
patent: 4237457 (1980-12-01), Houldsworth
patent: 4262290 (1981-04-01), Vallins
patent: 4371872 (1983-02-01), Rossman
patent: 4479192 (1984-10-01), Yamagami
F. C. Crow, "The Aliasing Problem in Computer-Generated Shaded Images", Communications of the AGM, Nov. 1977, pp. 799-805.
S. Gupta et al, "Filtering Edges for Gray-Scale Displays", Computer Graphics, Aug. 1981, pp. 1-5.

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