Compression of the dynamic range of video signals

Details Compression of the dynamic range of video signals Compression of the dynamic range of video signals

1982-11-30

1985-05-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514

Patent

active

045161674

ABSTRACT:
Video signals are subjected to two-dimensional high-pass spatial filtering as a first step in reducing their dynamic range. Then, in a second step of the compression process, differentiation spikes generated in response to edges of large objects in the original video signals are suppressed. This is done in real time using an adaptive non-linear amplifier, the gains of which in a number of amplitude zones are controlled by a histogram of the high-pass-filtered video signals.

REFERENCES:
patent: 4091420 (1978-05-01), Omori et al.
patent: 4326258 (1982-04-01), de la Guardia
patent: 4353092 (1982-10-01), Bailey et al.
patent: 4445138 (1984-04-01), Zwirn et al.

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