Image processing system and method with improved reconstruction of continuous tone images from halftone images including those without a screen structure
March 25, 2012. 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 ReferencesMultiple measurement noise reducing system using space-variant filters Image enhancement Halftone picture processing apparatus Image scanning and recording method Image processing apparatus with high- and low-resolution image sensors and an edge detector Digital facsimile/image producing apparatus Image processing method Patent #: 4841374 InventorAssigneeApplicationNo. 857557 filed on 03/25/1992US Classes:358/3.08, Descreening (e.g., inverse halftone conversion)358/462, Text and image detection and processing358/465, Picture signal thresholding358/466, Variable thresholding technique382/233Including details of decompressionExaminersPrimary: Coles, Sr., Edward L.Assistant: Lee, Fan Attorney, Agent or FirmInternational ClassH04N 001/40AbstractAn image processing system converts unscreened and other halftone images to continuous tone images. Value data is sequencitally generated for successive pixels of a screened or unscreened halftone image. Each image pixel is Sigma filtered with a predetermined set of filter parameters including the filter window size and a Sigma difference range that is applied to determine which pixels in the filter window are counted in determining average window pixel values. An output continuous tone image containing the Sigma filtered pixels is generated for storage and/or processing to a halftone copy or print. | |
