【発明の名称】ダークシェーディング補正回路

Title:

【発明の名称】ダークシェーディング補正回路

Document Type and Number:

Japanese Patent JP3137339

Kind Code:

B2

Abstract:

Disclosed is a dark shading correction circuit for a television camera or a video camera, which circuit is intended for canceling a dark shading signal component contained in a video signal outputted from an image pickup device (6), thereby effecting the dark shading correction on the video signal. In synchronization with a vertical synchronizing signal, the image pickup device (6) outputs a video signal containing an optical black reference signal outputted in response to each horizontal scanning signal, while a timing signal generator (10) generates at least two timing signals for detecting the optical black reference signal in the video signal. On the other hand, detection means (7a, 7b) detect at least two optical black reference signals contained in the video signal based on the at least two timing signals. Correction signal generating means (3, 8, 9) generate and output a correction signal for correcting the video signal in synchronization with the vertical synchronizing signal, based on the detected at least two optical black reference signals, so that the dark shading signal component contained in the video signal is canceled.

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Inventors:

Nobuo Iwai

Application Number:

JP51259097A

Publication Date:

February 19, 2001

Filing Date:

September 18, 1996

Export Citation:

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