Uniform distribution video processor with controlled reference v

Details Uniform distribution video processor with controlled reference v Uniform distribution video processor with controlled reference v

1981-12-28

1983-09-06

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, 358166, H04N 514

Patent

active

044032536

ABSTRACT:
A video processor that provides non-linear amplification of an input video signal by automatically modulating a non-linear transfer function of an amplifier having a plurality of piece-wise, analog-to-digital (A/D) converter sections. Each A/D converter has both high and low reference levels set at the input break points of the non-linear transfer function to assign an equal number of shades or levels of gray thereto. The high and low reference levels are connected in a "totem pole" configuration with the high reference level of the first converter providing the low reference level to the second converter, and so on for the remaining converters. Each of a plurality of reference control generators continuously adjusts the reference levels applied to an associated A/D converter by comparing the output video signal with a pre-determined reference voltage to nearly uniformly distribute each level of gray in accordance with the percentage of time various levels of the output video signal are detected, to thereby enhance the perception of visual information.

REFERENCES:
patent: 3979555 (1976-09-01), Opittok et al.
patent: 3983320 (1976-09-01), Ketcham et al.
patent: 3999047 (1976-12-01), Green
patent: 4268363 (1981-05-01), Los
patent: 4353092 (1982-10-01), Bailey et al.

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