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All basic detection tools have a number of common settings.To set up the tampering detection, do the following:

  1. If a camera supports multistreaming, select the stream for which detection is needed (1). Selecting a low-quality video stream allows reducing the load on the Server.
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  2. Select one or more analyzes to be applied to the video image (2).
  3. Set the frame rate value for the detection tool to process (3). This value should be in the range [0.016, 100].

  4. The default setting for all detection tools analyzes is Decode only key frames (24). In this case, the frames are processed every 500 milliseconds or less often.  To To disable Decode the decoding of key frames, select No in the appropriate field.

    Note
    titleImportant

    This setting applies to all codecs. If a codec has keyframes and p-frames, the keyframe is decoded no more often than every 500 miliseconds. For the MJPEG codec, each frame is considered to be I-frame.

    This feature reduces the Server load but, as can be expected, negatively impacts the quality of detection.

    This setting should be activated on "blind" Servers (Servers that do not display video) on which it is necessary to perform detection.


    Note
    titleImportant

    Period and Decode key frames parameters are correlated.

    If no local Clients are connected to a Server, the following rules are set for remote Clients:

    • If the interval between consecutive I-frames exceeds the value specified in the Period field, the detection tool will process I-frames.
    • If the I-frame frequency is lower than the value specified in the Period field, the detection tool will use the set value.

    If at least one local Client connects to the Server, the detection tool is forced to use the set value. After the local Client disconnects, the indicated rules become valid again.


  5. Select a processing resource for decoding video streams (35). When you select a GPU, a stand-alone graphics card takes priority (when decoding with NVidia Nvidia NVDEC chips). If there's no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding.

  6. Set the frame rate value for each detection tool to process (4). This value should be in the range [0.016, 100]. 


If you select Noise detection analysis, Blurred image analysis, or Compression artifacts anlysis, it is necessary to specify the following parameters:

  1. Event duration to trigger detection (sec) is the maximum time of the event duration after which the detection tool will trigger (1). But, the detection tool can trigger even earlier if the algorithm undoubtedly determines the noise. If the detection tool does not trigger after the event duration time expires, it means that the corresponding image defect was not detected with the specified detector sensitivity.
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  2. Sensitivity of detection tool operation

To configure detection of noise, blurred image and compression artifacts, do as follows:

  1. Max Processing Time is the maximum time for detection (1). If the bad image is not detected within the specified time, change the sensitivity settings.
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  2. Sensitivity in standard units from 0 to 100 (2).

To save settings, click the Apply button.

Tip

Video requirements for tampering detection