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:
Feb. 06, 2001
Filed:
Apr. 30, 1998
Applicant:
Inventor:
Jae Hwal Yoo, West Hills, CA (US);
Assignee:
Hitachi Koki Imaging Solutions, Inc., Simi Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 1/52 ; H04N 1/60 ; H04N 1/405 ; H04N 1/407 ;
U.S. Cl.
CPC ...
H04N 1/52 ; H04N 1/60 ; H04N 1/405 ; H04N 1/407 ;
Abstract
A method and apparatus for halftoning over a region of output pixels by defining large, or macro, halftone cells corresponding to regions of contiguous pixels and partitioning the macro halftone cells into smaller halftone cells. The gray, or hue, level within a macro halftone cell is determined by the number of pixels which are darkened within the macro halftone cell. Selection of the number of pixels to be darkened in response to input data can be effected in a manner to achieve automatic gamma correction.