Image processing method and apparatus
February 21, 2011. 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 multimode continuous halftone line copy reproduction Electronic rescreen technique for halftone pictures Multi-resolution image signal processing apparatus and method Device for disconnecting the receiver in case of a small signal-to-noise ratio for a digital-modulated radio system Multiple measurement noise reducing system using artifact edge identification and selective signal processing Multiple measurement noise reducing system using space-variant filters Text/continuous tone image decision processor Vision inspection system Method and apparatus for forming a combined image signal Edge enhancement filtering for digital fluorography images InventorsAssigneeApplicationNo. 657949 filed on 02/21/1991US Classes:382/266, Edge or contour enhancement348/625, Transition or edge sharpeners358/447, Signal enhancing358/462Text and image detection and processingExaminersPrimary: Mancuso, JosephAttorney, Agent or FirmForeign Patent References
International ClassG06K 009/48Foreign Application Priority Data1984-12-28 JPAbstractThere are image processing method and apparatus for use in digital copying apparatuses, facsimile apparatuses, etc. which handle an image signal. This apparatus comprises an edge detector to detect the edge portion of the image signal, a smoothing circuit to smooth the image signal, an edge emphasizer to emphasize the edge of the image signal, and a mixer to mix the output of the smoothing circuit and the output of the edge emphasizer. A mixture ratio of the output of the smoothing circuit and the output of the edge emphasizer is varied in response to the output of the edge detector. The edge detection of the edge detector is performed due to the linear differentiation. With this apparatus, the moire in the case of a mesh original image is removed and the characters and line drawings can be reproduced with a high degree of fidelity.Other References
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