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:
Mar. 14, 1995
Filed:
Jun. 30, 1994
Youichi Satoh, Kanagawa, JP;
Joji Tajima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a digital halftone screen generating device for generating a digital halftone screen comprising a plurality of periodic patterns, a configuration determining section (53) determines a grid (27) indicative of a configuration of one of the periodic patterns in the digital halftone screen by using periodic constants (51). Supplied with the periodic constants (51) and a function (50) defining a procedure for obtaining threshold values in a square area, a threshold value distributing section (54) rotates the threshold values defined by the function (50) by a screen angle. The threshold value distributing section (54) expands on the grid (27) threshold values enlarged by an enlargement ratio. When the threshold values on the grid (27) have discontinuous numbers, the threshold value distributing section (54) rearranges the threshold values so as to have continuous numbers. The threshold value distributing section produces a periodic pattern signal (52) indicative of the threshold values having the continuous numbers.