Video camera with flare correcting circuit

Details Video camera with flare correcting circuit Video camera with flare correcting circuit

1992-03-30

1994-01-18

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, 358166, 358163, 358160, H04N 5235, H04N 557, H04N 514

Patent

active

052803546

ABSTRACT:
A video camera equipped with an image sensor for producing an analog video signal, an A-D converter for converting the analog video signal to a digital video signal in a manner that any component thereof above a predetermined luminance level is clipped, and a flare correcting circuit for removing any flare component superposed on the digital video signal. The flare correcting circuit comprises an average luminance level detector for detecting the average luminance level during a time period of several fields of the digital video signal; a clip period detector for detecting the time period, during which the analog signal is clipped, when the analog video signal is converted to the digital video signal by the A-D converter; a flare correction signal generator for producing a flare correction signal in accordance with the output signal of the average luminance level detector and the output signal of the clip period detector; and a subtracter for subtracting the flare correction signal from the digital video signal.

REFERENCES:
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patent: 4302777 (1981-11-01), Kemner et al.
patent: 4575758 (1986-03-01), Egerod
patent: 4589019 (1986-05-01), Dischert et al.
patent: 4799106 (1989-01-01), Moore et al.
patent: 4974810 (1990-12-01), Fiske
patent: 5155586 (1992-10-01), Levy et al.

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