Security system and warning method using edge detection of image signal
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United States of America Patent
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Issued Date -
Jan 13, 2005
app pub date -
Apr 1, 2004
filing date -
Nov 15, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosed are a warning generation method and a security system using edge detection of a video image signal. The warning generation method includes the steps of: a) decoding video image signals and extracting luminance signals from the decoded video image signals: b) filtering high-frequency components of the extracted luminance signals and detecting edge components within the video image signals: c) extracting only values within a range of a predetermined first threshold value form the detected edge componenets: d) accumulating the detected edge components for one video image: and e) operating a warning device if an accumulation value is smaller than a predetermined second threshold value. When an intruder blinds a camera lens using a cover, the security system can generate a warning by identifying the fact that the camera is blinded by the cover.
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