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This detection tool notifies the Operator about camera tampering, resulting in focus loss or camera sensitivity degradation. The high frequency component of the video signal is analyzed to check for presence of distinct contours.
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The detection is performed by key frames. If detection tool configuration process described below does not result in a proper detection quality, i.e. the detection tool does not trigger or triggers with a delay, it is recommended to reduce key frame rate for video camera (see Configuring video compression) or video analytics stream if the camera has multiple streams (see Configuration of multistream video). |
To configure Focus detection tool, do the following:
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