Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-03-31
1989-04-18
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 37, H04N 5208
Patent
active
048231908
ABSTRACT:
An apparatus for effecting contour enhancement in a non-linear manner, in accordance with the amplitude of a contour signal, includes an upper limiter for clipping a portion of the contour signal exceeding an upper level and a lower limiter for clipping a portion of the contour signal below a lower level. The gain of the contour signal for a brightness signal having a large level difference is decreased relative to the gain of the contour enhancement signal for a brightness signal having a small level difference, and thus glare and cross-color noise can be reduced materially, while the contour for a brightness signal having a small level difference can be enhanced sufficiently.
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Coles Sr. Edward L.
Faris E. Anne
Ikegami Tsushinki Co. Ltd.
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