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. 04, 2005
Filed:
Sep. 26, 2000
Takafumi Naka, Nagoya, JP;
Takafumi Naka, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
A reference image signal level curve Vand a predetermined coefficient are provisionally stored in a ROM of a main controller. The predetermined coefficient provides a threshold level curve by multiplying by the curve V. A white color image signal level curve Vis formed upon reading a white reference surface by optical sensors. The white color image signal level curve Vis compared with the reference image signal curve V. If at least a part of the curve Vis not coincident with at least a part of the curve V, the curve Vis multiplied by ΔV percent, and this percentage is stored in a RAM. These are performed repeatedly until a part of the curve Vis coincident with a part of the curve Vas a result of increase in cumulative ΔV percent. Thus, a correction coefficient K is determined based on the cumulative ΔV percent to provide a corrected image signal level curve. The corrected image signal level curve is compared with the threshold level curve to obtain a binary image data.