Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1991-05-30
1993-05-18
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 973
Patent
active
052125459
ABSTRACT:
A pedestal clamping device clamps a pedestal level of an input video signal in response to a predetermined pedestal voltage, and converts the input video signal into a clamped video signal. A black-level expanding device expands a tone of a black portion of the clamped video signal, and converts the clamped video signal into a black-level expanded video signal. A color greatest detecting device detects a greatest of color signals of the input video signal. A adding device adds an output signal from the color greatest detecting device and the pedestal voltage. A black-level comparing device detects a blackest portion of the black-level expanded video signal; compares the detected blackest portion of the black-level expanded video signal with the output signal from the adding device; and controls a degree of expanding the black tone by the black-level expanding device in response to a difference between the detected blackest portion of the black-level expanded video signal and the output signal from the adding device.
REFERENCES:
patent: 4164750 (1979-08-01), Hosoya
patent: 4922330 (1990-05-01), Saito
patent: 4954884 (1990-09-01), Nakayama
Chin Tommy P.
Matsushita Electric - Industrial Co., Ltd.
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