Non-linear luminance signal processor responsive to average pict

Details Non-linear luminance signal processor responsive to average pict Non-linear luminance signal processor responsive to average pict

1991-12-16

1992-11-10

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 557

Patent

active

051629020

ABSTRACT:
A signal processor responsive to a video input signal provides a first video output signal linearly related to the input signal and a second video output signal non-linearly related to the video input signal. A first combining circuit combines the first and second video output signals in predetermined proportions to provide a third video output signal having both linear and non-linear components. A second combining means combines the second and third video output signals in proportions determined by an average picture level (APL) representative control signal to provide a processed video output signal having enhanced contrast for all values of the average picture level of displayed images.

REFERENCES:
patent: 4599643 (1986-07-01), Harlan
patent: 4829381 (1989-05-01), Song et al.
patent: 4975773 (1990-12-01), Rabii
patent: 5003394 (1991-03-01), Lagoni
patent: 5047861 (1991-09-01), Houchin et al.

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