Anti-aliasing apparatus and method with automatic snap fit of ho

Details Anti-aliasing apparatus and method with automatic snap fit of ho Anti-aliasing apparatus and method with automatic snap fit of ho

1996-05-28

2000-08-08

Hong, Stephen S.

Data processing: database and file management or data structures

Database design

Data structure types

G06F 1721

Patent

active

061015148

ABSTRACT:
The invention provides a method and apparatus for creating anti-aliasing effects in slanted or curved edge portions of a bit-mapped image while avoiding such effects at horizontal and vertical edge portions. A method in accordance with the invention comprises the steps of: (a) defining a set of plot instructions for plotting an ideal outline of a desired image; (b) identifying a target resolution to be provided by a bit-mapped rendering apparatus; (c) scaling and grid-fitting the outline to the identified target resolution; (d) upwardly scaling the grid-fitted outline to a mezzanine resolution level that is higher than the identified resolution of the target display medium; (e) filling the outline at the mezzanine resolution level (scan conversion); (f) assigning, based on the mezzanine level outline fill, one or more of a grayscale value or other anti-aliasing attribute vales to each corresponding pixel of the target display medium (sampling); and (g) rendering the image in accordance with this attribute assignment onto the target display medium for appreciation by a human observer.

REFERENCES:
patent: 4437122 (1984-03-01), Walsh et al.
patent: 5249242 (1993-09-01), Hanson et al.
patent: 5270836 (1993-12-01), Kang
patent: 5301267 (1994-04-01), Hassett et al.
patent: 5459828 (1995-10-01), Zack et al.

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