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:
Jun. 07, 2016
Filed:
Mar. 30, 2015
Brother Kogyo Kabushiki Kaisha, Nagoya, Aichi, JP;
Yuji Hori, Gifu, JP;
Kentaro Sugiyama, Gifu, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, Aichi, JP;
Abstract
An image scanning apparatus is configured to obtain a greatest gray gradation value when the light source illuminates the gray reference member at a first light quantity value, obtain a gradation value of a black signal output by the signal conversion unit when the light source is powered off, calculate a first difference value, set a second light quantity value, set a correction light quantity value, obtain a second difference value by subtracting the gradation value of the black signal from the second gradation value of a white signal, calculate a shading correction value based on a ratio of the second difference value to the first difference value, control the scanning unit to scan the image on the original sheet with controlling the light source to illuminate the original sheet in accordance with the second light quantity value, and apply the shading correction in accordance with the shading correction value.