Fast vertical scan-conversion and filling method and apparatus f

Details Fast vertical scan-conversion and filling method and apparatus f Fast vertical scan-conversion and filling method and apparatus f

1991-07-12

1994-01-04

Harkcom, Gary V.

395141, 395150, G06F 1562

Patent

active

052767906

ABSTRACT:
A fast vertical scan-conversion and filling method and apparatus for outline font character generation in dot matrix devices including a normalized polysegment generation engine for converting spline data to normalized polysegment data, a vertical scan conversion engine comprised of a decision table transitioner (DT) unit for identifying the location of a transition pixel relative to each polysegment or indicating that an identification cannot be made, intersection transition calculating unit (IT) for calculating the position of a transition pixel relative to each polysegment, and a transition pixel coordinate generating unit responsive to the normalized polysegment data and input received from the DT and IT units and operative to generate signals corresponding to the X and Y coordinates of each transition pixel, and a parity filling engine responsive to the x and y coordinate segment and operative to generate bit mapped character image data for use in driving a bit map print or display device.

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patent: 4626838 (1986-12-01), Tsujioka et al.
patent: 4745575 (1988-05-01), Hawes
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Bresenham, J. E., "Algorithm for Computer Control of a Digital Plotter" (IBM Systems Journal, vol. 4, No. 1, 1965; pp. 25-30).
Bresenham, J. E., "A linear Algorithm for Incremental Digital Display of Circular Arcs" (Communication of the ACM, 20(2), Feb. 1977, pp. 100-106; see also Fundamentals of Interactive Computer Graphics, by J. D. Foley and A. VanDam, Addison-Wesley Publishing Co., 1982, pp. 433-436, 461).
Hersch, R. D.; "Vertical Scan-Conversion for Filling Purposes" (Proceeding Computer Graphics International 88, Geneva, May 24-27 (D. Thalmann, ed.), Springer Verlag, 1988).

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