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:
Jan. 15, 1991
Filed:
Sep. 19, 1989
Winrich Gall, Klausdorf, DE;
Intergraph Corporation, Huntsville, AL (US);
Abstract
An improved method and apparatus for generating halftone images using a beam of variable intensity. A look-up table that is accessed, at a minimum, by position coordinates and image intensity data provides beam intensity information. In certain embodiments, the look-up table may be accessed by dot set identification data and/or randomly generated numbers in addition to the position coordinates and the image intensity data. The position coordinates (x,y) may be generated by performing a coordinate transformation on the beam position coordinates (u,v). The beam intensity data stored in the look-up table may permit the formation of soft dots, i.e. halftone dots that are formed by different levels of beam exposure. The look-up table also permits an increase in dot frequency in the middle tones.