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:
Jan. 07, 1997
Filed:
May. 25, 1995
Nikon Corporation, Tokyo, JP;
Abstract
An image reading apparatus for reading an image on film which uses a shading correction coefficient computation unit for obtaining a shading correction coefficient in order to correct irregularities in image signals of a photoelectric conversion unit, and a quantity of light ratio measurement unit for obtaining the ratio of the quantity of light of each emission color in order to equalize the quantity of light emitted by a light emission unit. The shading correction coefficient and the quantity of light ratio are obtained immediately before reading of a first original medium, and additional original mediums can then be read using the correction coefficients obtained for the first original. Alternately, the shading correction coefficient and the quantity of light ratio can be obtained immediately before reading each original medium.