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. 14, 2002
Filed:
Nov. 10, 1998
Atsushi Miyazawa, Tokyo, JP;
Namco Limited, , JP;
Abstract
A pseudo random number pattern which does not contain the minimum and maximum gradation values of pixels of input image data, and consists of, as elements, threshold values set at nearly equal intervals, is generated, and input image data is binarized by ordered dithering using this pseudo random number pattern. Since the elements of the pseudo random number pattern do not contain the minimum and maximum gradation values of the pixels of the input image data, even when a binary image is input, noise components, i.e., black or white isolated pixels can be prevented from periodically appearing. Since the threshold values of the pseudo random number pattern are set at nearly equal intervals, a dither image with quality as high as that can be obtained by the conventional method can be obtained even when a halftone image is input.