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:
Feb. 04, 2003
Filed:
May. 16, 2002
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A document-image reading device that can analyze a speed fluctuation state of a scanner when scanning an image in the feed direction by separately extracting speed fluctuation components by reading a change in density of reference scale lines and, on the basis of the analysis result, prevents the occurrence of an image blur that may be resulting from unstable factors of a driving mechanism. The document-image reading device for reading a document image data at a specified time-interval given by the reference clock signal, which comprises an image sensor for reading a document image by moving the image sensor or the document in the feed direction and is featured in that the document-image reading device is further provided with a chart reader for reading a reference chart portion having alternations of a high-density division and a low-density division arranged one after another at a distance-interval equal to a least pitch readable by the document-image reading device along the feed direction and a processor for processing image data read from the reference chart portion by using a comb-type filter and by integration.