Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-06-09
1993-07-06
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, 358448, 382 54, H04N 140
Patent
active
052259153
ABSTRACT:
In an image processing device for processing image data representing an image, and including an image filtering arrangement, a filter function is applied to the image data that greatly amplifies or enhanced high frequency imge data, including noise inherent in the image. Such noise, which may be the granularity of the image, when enhanced, serves to mask the beating pattern of moire. One function which accomplishes adequate high frequency and noise filtering is a modified Laplacian function with a maximum modulation at a frequency of the noise or granularity of the image. Similarly, the special effect of a random screen image or mezzo tint is obtained when a continuous tone image is processed with the modified Laplacian filtering function, and subsequently thresholded in a thresholding arrangement.
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Bhaskar Ranjit
Ciccone Theresa J.
Coles Sr. Edward L.
Costello Mark
Lee Thomas D.
Xerox Corporation
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