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:
May. 13, 2003
Filed:
Jun. 01, 1999
Hiroyuki Morimatsu, Kurume, JP;
Seiichiro Hiratsuka, Kitakyushu, JP;
Abstract
A method of gradation reproduction including (a) taking image data of a pixel subject to transaction as observing pixel data; (b) weighting the image data with an error diffusion matrix based on an error data calculated on a previously processed neighboring pixel of the observing pixel; (c) obtaining a data of pixel neighboring the observing pixel; (d) calculating a density gradient around the observing pixel from the weighted observing pixel data and the neighboring pixel data, and determining whether or not the pixel lies in an image edge region; (e) determining a dot size by comparing the weighted observing pixel data with a threshold value corresponding to an individual dot size, and selecting a predetermined smaller dot size if the weighted observing pixel data lies in the edge region; (f) producing an output of dot data by taking dot coordinates as a standard position of the observing pixel, if the dot size data is greater than a threshold value for coordinates determination after a comparison between them; and (g) calculating an error data from the observing pixel data, the dot size data and the dot coordinates, and storing it in a storage means for use in a transaction of the succeeding pixel. Repeating the foregoing transaction controls both the dot size and dot coordinates, to realize a method of gradation reproduction that can prevent moire and texture from merging, and maintain fine transaction in the edge region.