Apparatus for correcting a black level of a video signal

Details Apparatus for correcting a black level of a video signal Apparatus for correcting a black level of a video signal

H - Electricity

04

N

H04N 9/68 (2006.01) H04N 5/18 (2006.01) H04N 9/72 (2006.01)

Patent

CA 2043828

A pedestal clamping device clamps a pedestal level of an input video signal in response to a predetermined pedestal voltage, and converts the input video signal into a clamped video signal. A black-level expanding device expands a tone of a black portion of the clamped video signal, and converts the clamped video signal into a black- level expanded video signal. A color greatest detecting device detects a greatest of color signals of the input video signal. A adding device adds an output signal from the color greatest detecting device and the pedestal voltage. A black-level comparing device detects a blackest portion of the black-level expanded video signal; compares the detected blackest portion of the black-level expanded video signal with the output signal from the adding device; and controls a degree of expanding the black tone by the black-level expanding device in response to a difference between the detected blackest portion of the black-level expanded video signal and the output signal from the adding device.

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