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. 24, 2005
Filed:
Aug. 23, 2001
Yukio Okamura, Nagano, JP;
Yukio Okamura, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A light source is turned off (S), incidence of light on a line sensor is shut off, and the output value of an electric signal output from each of pixels of the line sensor (S). Since the output value is detected 128 times (S), random noise can be reduced equal to or less than the variation in the output values for each pixel of the line sensor. The output values detected by a detection section are added up by an average value difference calculation section (S). The sum total of the output values is divided by the number of detection times (S) to calculate the average value of the output values (S). The average value difference calculation section calculates the difference between a setup value and the average value as an average value difference (S) and the average value difference is stored in black reference memory for each pixel (S). The average value difference is stored in the black reference memory, so that the storage capacity can be decreased as compared with the case where black reference data itself is stored.