Digital video black expander

Details Digital video black expander Digital video black expander

1988-12-28

1990-06-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 39, H04N 557

Patent

active

049376713

ABSTRACT:
A black expander circuit for a digital video signal includes a pair of moving average filters, one sampling pixels on a line basis and another sampling the pixel samples on a field basis to develop a moving digital average. The moving digital average is added to a constant to form a breakpoint value and supplied to a comparator along with the digital video signal. The output of the comparator controls a mutiplexer. The digital video signal is multiplied by a factor, algebraically summed with the breakpoint value and supplied as one input to the multiplexer with the digital video signal being supplied as the other input. The output of the multiplexer comprises a digital video signal that has portions below the breakpoint value expanded.

REFERENCES:
patent: 4187519 (1980-02-01), Vitols et al.
patent: 4204229 (1980-05-01), Heuze
patent: 4654710 (1987-03-01), Richard
patent: 4710805 (1987-12-01), Markle et al.

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