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. 17, 1988
Filed:
Jan. 22, 1987
Applicant:
Inventors:
Noriyuki Kaifu, Hiratsuka, JP;
Shinichi Seito, Atsugi, JP;
Hiromi Kodama, Atsugi, JP;
Katsuhiko Yamada, Hiratsuka, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358294 ; 2502 / ; 358280 ;
Abstract
An image reader, comprises a plurality of photosensors which photoelectrically convert incident light from an object to be read, a memory for storing, as correction reference data, data corresponding to photoelectric conversion outputs from said photosensors when said object to be read presents a uniform halftone image, and a correction circuit for obtaining uniform photoelectric conversion output levels among said photosensors using the correction reference data.