Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-06-30
1986-05-27
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340723, 340732, 340747, 340793, G09G 106
Patent
active
045918430
ABSTRACT:
The system forms displays as an array of picture elements each of which can have more than two possible intensities (e.g. a grey scale). The circle generator derives the intensities for elements in and near an arc of a circle to be drawn. The intensity for an element is determined by the closest distance d from the element to an ideal circle characterizing the arc in such a way as to give a smoothed appearance. The distance d is obtained from a distance accumulator (39) and applied, adjusted for the width of the arc, to a sample table (42) holding the intensities. A step sequencer (40) causes the circle generator to execute scans along lines of picture elements across the arc. At each step d is changed by a distance increment or decrement obtained from one or both of two increment accumulators (36) and (37). These in turn are changed at each step by a constant amount obtained from a register (38) and equal to the step size divided by the radius of the ideal circle. Arcs are bounded by radial lines and may be abutted.
REFERENCES:
patent: 3870922 (1975-03-01), Shutoh
patent: 3984664 (1976-10-01), Berwin
patent: 4237457 (1980-12-01), Houldsworth
patent: 4262290 (1981-04-01), Vallins
patent: 4314351 (1982-02-01), Postel et al.
patent: 4371872 (1983-02-01), Rossman
Brier Jeffery A.
Brigance Gerald L.
International Computers Limited
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