Image processing apparatus and method
Patent 5909287 Issued on June 1, 1999. Estimated Expiration Date: 
February 29, 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.
February 29, 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 ReferencesSignal processing system and the method Image reader having an editor for setting a threshold value Patent #: 5208873 InventorAssigneeApplicationNo. 610089 filed on 02/29/1996US Classes:358/461, Shade correction358/448Image processingExaminersPrimary: Grant, II, JeromeAttorney, Agent or FirmInternational ClassH04N 001/40Foreign Application Priority Data1995-03-02 JPAbstractA document serving as a white reference (a reference white background) is read to create shading data, the shading data are stored, the checksum of these shading data is obtained and this value also is stored. The checksum of the stored shading data is obtained before the document is read, and this obtained value of the checksum is compared with the already stored value of the checksum of the shading data. If the values of both checksums are found to coincide as a result of the comparison, image processing using the stored shading data is executed. If the values of both checksums do not coincide, however, image processing using shading data having a fixed value is executed.Field of SearchShade correctionImage processing Variable thresholding technique Noise elimination Color correction Gradation With memory for storage of conversion data Specific image-processing circuitry Selecting a portion of an image COLOR IMAGE PROCESSING Color correction With a gray-level transformation (e.g., uniform density transformation) | |
