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:
Sep. 01, 2009
Filed:
Sep. 10, 2004
Tatsuo Kimura, Kanagawa, JP;
Tatsuo Kimura, Kanagawa, JP;
Canon Kabuhsiki Kaisha, Tokyo, JP;
Abstract
An image processing apparatus for obtaining image information by detecting, as an image signal, an electrical signal corresponding to a reflectance or transmittance of an original, including: an A/D converting circuit for converting an analog signal outputted from a photoelectric conversion element into an n-bit digital signal; and a shading correcting circuit for correcting an output characteristic of the photoelectric conversion element, high m bits of the n-bit digital signal being set as effective bits when white shading data is obtained, low m bits of the n-bit digital signal being set as effective bits when black shading data is obtained, bits being added as low bits to the m-bit white shading data, bits being added as high bits to the black shading data, shading calculation being performed. In the image processing apparatus, a capacity of a shading memory can be suppressed without reduction in quantifying resolution of the black shading data.