Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-12-16
1993-03-02
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358169, 358 39, 358174, H04N 557, H04N 552, H04N 977
Patent
active
051914204
ABSTRACT:
A non-linear (e.g., "white stretch") processor and a brightness control processor are coupled in cascade between an input for receiving a video input signal to be processed and an output for providing a processed video output signal. A control signal for controlling the transfer characteristics of the non-linear processor is provided by an amplifier having a first input coupled to receive an average picture level (APL) indicating signal derived from the processed video output signal and having a second input coupled to receive a reference level signal supplied thereto. A brightness control signal is applied to a control input of the brightness control processor for controlling the brightness level of the processed video output signal. Circuit means are provided for deriving at least a portion of the reference level signal for the amplifier from the brightness control signal supplied to the brightness control processor thereby reducing a tendency for variations in the brightness control signal to alter the transfer characteristics of the non-linear processor.
REFERENCES:
patent: 4489349 (1984-12-01), Okada
patent: 4599643 (1986-07-01), Harlan
patent: 4980756 (1990-12-01), Lagoni
patent: 5003394 (1991-03-01), Lagoni
Lagoni William A.
O'Brien Robert L.
Emanuel Peter M.
Lenihan Thomas F.
Peng John K.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Video system with feedback controlled "white stretch" processing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video system with feedback controlled "white stretch" processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video system with feedback controlled "white stretch" processing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-130278