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Tip

Video stream and scene requirements for the

Tampering

Video clarity detector

Image requirements for the

Tampering

Video clarity detector

To

...

configure the Video clarity detector, do the following:

  1. Go to the 

...

  1. Detectors tab.

  2. Below the required camera, click Create… → Category: Service

...

  1. → Video clarity detector.

By default, the detection tool detector is enabled and set to respond to all types of video analysis.

If necessary, you can change the detection tool detector parameters. The list of parameters is given in the table:

ParameterValueDescription
Object features
Video streamMain streamIf the camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream reduces the load on the
Server
server
Other
EnableYesBy default, the
detection tool
detector is enabled. To disable the detector, select
the 
the No
 value
 value
No
Name
Tampering Detection
Video clarity detectorEnter the
detection tool
detector name or leave the default name
Decode key frames

Yes

By default, the Decode key frames parameter is enabled. In this case, only key frames are decoded. To disable the parameter, select the No value.
This parameter reduces the load on the

Server

server, but at the same time the detection quality decreases. We recommend enabling this parameter for "blind" (without video image display)

Servers

servers, on which you want to perform detection.
For the MJPEG codec, decoding isn’t relevant, as each frame is considered a key frame.

Note
titleAttention!

The Number of frames processed per second and Decode key frames parameters are interrelated.

If a local

Client

client isn’t connected to the

Server

server, the following rules work for remote

Clients

clients:

  • If the key frame rate is less than the value specified in the Number of frames processed per second field, the
detection tool will work
  • detector works by key frames.
  • If the key frame rate is greater than the value specified in the Number of frames processed per second field, the detection
will be
  • is performed according to the set period.

If a local

Client

client is connected to the

Server

server, the

detection tool

detector will always work according to the set period. After disconnecting the local

Client

client, the above rules

will be

are relevant again.

 
No
Decoder modeAutoSelect a processing resource for video decoding
video
. When you select a GPU, a stand-alone graphics card takes priority (when decoding with
 
Nvidia
 
NVDEC chips). If there is no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources
will be
are used for decoding
CPU
GPU
HuaweiNPU
Number of frames processed per second25Specify the number of frames for the
detection tool
detector to process per second. The value must be in the range [0.016; 100]
Type
Tampering Detection
Video clarity detectorName of the
detection tool
detector type (non-editable field)
Advanced settings
Blurred image analysisYes
Tip

Functions of the

Tampering

Video clarity detector

By default, all types of analysis are applied to the video image. Select the No value for unnecessary types of analysis.

Note
titleAttention!

If you select Compression artifacts analysis, Image noise

analysis 

analysis, and Blurred image analysis, you must specify the values for the Event duration to trigger detection (sec)

,

and Sensitivity parameters.


No
Compression artifacts analysisYes
No
Image noise analysisYes
No
Quality degradation analysisYes
No
Scene change analysisYes
No
Basic settings
Event duration to trigger detection (sec)20

Specify the maximum time of event duration for the response in seconds, after which the

detection tool

detector generates an event. The value must be in the range [5, 1200].

  • If the algorithm
definetely
  • definitely detects a defect in the frame, the response from the
detection tool
  • detector comes before the specified time.
  • If after the specified time, the defect hasn't been detected, you must increase the Sensitivity of the
detection tool
  • detector
Sensitivity 50Specify the sensitivity of the
detection tool
detector as a percentage. The higher the sensitivity, the smaller change in the frame is detected. The value must be in the range [0, 100]

To save the parameters of the detection tooldetector, click the Apply Image Modified button. To cancel the changes, click the Cancel Image Modified button.

Configuring the Video clarity detector is complete.