The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2000
Filed:
May. 28, 1996
Allen M Chan, Cupertino, CA (US);
Apple Computer, Inc., Cupertino, CA (US);
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.