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:
Mar. 23, 1999
Filed:
Apr. 10, 1997
Toru Matsui, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
This invention relates to an image reader capable of reading document images in parallel with the measurement of the state of curvature of the document surface, and correcting image distortion caused by said curvature in real time. An illumination light source for reading documents is provided with a filter to separate infrared light and visible light. The visible light is used to read document image information, and the infrared light is used to measure the state of curvature of the document. Since document reading and document curvature measurement are accomplished using light having different characteristics, these operations can be accomplished simultaneously.