Video signal processing apparatus with reduced noise sensitivity

Details Video signal processing apparatus with reduced noise sensitivity Video signal processing apparatus with reduced noise sensitivity

1990-12-31

1992-10-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5208, H04N 514

Patent

active

051537273

ABSTRACT:
An improved video signal processing circuit employs a control signal generating device, first and second delay circuits, a signal selection circuit, an addition circuit, a subtraction circuit, and an addition/subtraction circuit. The signal selection circuit is responsive to switch control signals from the control signal generating device for selecting a first signal path when providing signal contour compensation or a second signal path when functioning as a sensitivity enhancement device. At the final output terminal of the present circuit is produced a contour-compensated luminance signal under medium or high illumination selection control and an enlarged luminance signal without noise under low illumination selection control. Mode change is a function of and dependent on the amount of incident light to be automatically achieved by the control signal generating device.

REFERENCES:
patent: 3562424 (1971-02-01), Legler
patent: 4541014 (1985-09-01), Yagi
patent: 4654709 (1987-03-01), Umezawa
patent: 4979043 (1990-12-01), Suzuki et al.
patent: 4991021 (1991-02-01), Nikoh et al.
"A Vertical Aperture Equalizer for Television", by Gibson et al., Journal of the Society of Motion Picture and Television Engineers, vol. 69, No. 6, Jun. 1960, pp. 395-401.

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