Image processing apparatus and system having detachably mounted read cartridge
Patent 5987186 Issued on November 16, 1999. Estimated Expiration Date: 
November 25, 2016. 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.
November 25, 2016. 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 References 3886371 Image forming apparatus Image reader Non-destructive target marking for image stitching White-level correction circuit used with an analog-to-digital converter for an image reading apparatus Image reading device and method for correcting image exposure data Patent #: 5721626 InventorsAssigneeApplicationNo. 755949 filed on 11/25/1996US Classes:382/274, Intensity, brightness, contrast, or shading correction358/445, Signal sampling and conversion358/446, Signal voltage or gain control358/461, Shade correction358/497Scanning element moves relative to a flat stationary documentExaminersPrimary: Rogers, Scott A.Attorney, Agent or FirmForeign Patent References
International ClassesH04N 001/024H04N 001/04 H04N 001/407 Foreign Application Priority Data1995-12-07 JPAbstractIn an image processing device, a white level reference value is obtained by allowing an CCD sensor to scan a white level standard sheet. The white level reference value is stored in SRAM which is resident in a scan cartridge. The white level reference value in the SRAM is modified when an original document is read through a clear sheet, to obtain a high-quality image.Field of SearchIntensity, brightness, contrast, or shading correctionShade correction Facsimile measuring, testing, or calibrating Signal sampling and conversion Signal voltage or gain control Scanning element moves relative to a flat stationary document Linear scanning pattern Picture signal generator Combined read and write head Recording apparatus | |
