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:
Oct. 31, 2006
Filed:
Jul. 25, 2001
Takeshi Shibuya, Chiyoda, JP;
Yukio Yamamoto, Fujishiro, JP;
Naoyuki Urata, Hadano, JP;
Toshiyuki Yamada, Hadano, JP;
Natsuhiko Hirayama, Hadano, JP;
Takeshi Shibuya, Chiyoda, JP;
Yukio Yamamoto, Fujishiro, JP;
Naoyuki Urata, Hadano, JP;
Toshiyuki Yamada, Hadano, JP;
Natsuhiko Hirayama, Hadano, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
In an image output device a test chartincluding tests chartsof each color is used, and a tone correction table is calculated. The test chartsare patterned in a checkered pattern, each including continuous areasin which the tones increase in steps and reference areasfor comparison with the continuous areas. The reference areasare formed of white ground of paper in a highlight proof part, a solid pattern with a maximum density in a shadow proof part, and halftone dot-concentrated or line screens with a lower resolution than in the continuous areas in a middle proof part. Tone correction values are calculated from characteristic values of the highlight, shadow and middle parts, obtained from visual data of the test chart