Shading correcting method in image reading device
Patent 5084772 Issued on January 28, 1992. Estimated Expiration Date: 
December 31, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 31, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAutomatic control of iris and clamping voltage in video signal generator Method and apparatus for calibrating a linear array scanning system System for correcting shading or non-uniformity in a photosensitive element array Automatic light control system Patent #: 4618254 InventorApplicationNo. 633207 filed on 12/31/1990US Classes:358/461, Shade correction358/475Facsimile illumination controlExaminersPrimary: Groody, James J.Assistant: Harvey, David E. Attorney, Agent or FirmForeign Patent References
International ClassH04N 001/40Foreign Application Priority Data1986-10-31 JPAbstractAn original document image is irradiated with light emitted from a light source, and light reflected from or passed through the original document image is applied to a line sensor for reading the image. A maximum output value of the line sensor is determined within a linear characteristic region thereof with respect to the amount of exposure of the line sensor to the light reflected from or passed through the original document image. The amount of light emitted from the light source is regulated within the maximum output value to determine a sensitivity correcting value for the line sensor with respect to a reference object, and the sensitivity correcting value is stored as corrective data. An image signal from the line sensor is corrected with the corrective data when the original document image is read.Other References
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