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. 24, 2011
Filed:
Aug. 22, 2006
Takeshi Shibuya, Ibaraki, JP;
Nobuyuki Sato, Kanagawa, JP;
Naoyuki Urata, Kanagawa, JP;
Shiro Kofuji, Kanagawa, JP;
Takeshi Shibuya, Ibaraki, JP;
Nobuyuki Sato, Kanagawa, JP;
Naoyuki Urata, Kanagawa, JP;
Shiro Kofuji, Kanagawa, JP;
Ricoh Company, Ltd., Ohta-Ku, Tokyo, JP;
Abstract
A halftoning device that converts an input pixel signal of 8 bits per pixel into an output pixel signal of r bits per pixel(r<8), the halftoning device includes: a gradation correction unit that expands the input pixel signal into an expanded pixel signal of n bits per pixel(n>8); a threshold value array storage that stores a threshold value array having a threshold value of 8 bits; and a threshold value expansion unit that expands the threshold value of 8 bits to expanded threshold value of n bits per pixel. A range of the expanded pixel signal output from the gradation correction unit is matched with a range of the expanded threshold value. The output pixel signal is set according to a comparison of the expanded pixel signal with the expanded threshold value corresponding to the threshold value that is selected for each input pixel signal.