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. 01, 1990
Filed:
Sep. 12, 1989
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A color film reading apparatus capable of generating high-gradation color signals from either a color negative or positive film includes a holding device for holding a color negative film, illuminating apparatus for projecting illumination light onto the color negative film, a reading unit for reading image data from the light projected through the color negative film, and shading circuitry for performing shading correction. Control circuitry controls the reading unit to cause the reading unit to raed data from an unexposed portion of the negative to obtain shading correction data. In the case of a positive film, the controlling circuitry sets the shading correction data on the basis of data obtained from the illumination light. Further, a high-gradation color image may be obtained from either a film original or a reflection from an original document.