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Hardware requirements for License plate recognition RR and Vehicle recognition RR

Camera requirements for the License plate recognition RR, Vehicle recognition RR and their sub-detectors

Optimizing the operation of License plate recognition RR and Vehicle recognition RR on GPU in Windows OS

Parameters that specify the conditions for starting a macro when recognizing a vehicle

To configure the License plate recognition RR—Parking detectorTo configure the License Plate Recognition RR—Parking detection tool, do the following:

  1. Go
    2. to the Detection Tools tab
  2. to the Detectors tab.
  3. Below the required camera,
    4. click 
  4. click Create… → Category: Vehicle →
    5.  
  5. License
    6. Plate Recognition
  6. plate recognition RR—Parking.

By default, the detection tool detector is enabled and set to recognize vehicle license plates in the parking lot.

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

Select the accuracy and performance of vehicle recognition:

  • Medium accuracy and high performance—provides medium recognition accuracy and high GPU performance (less load on GPU);
    • High accuracy and medium performance—provides maximum recognition accuracy and medium GPU performance (high load on GPU)Event timeout time in seconds after which the alarm must be generated after recognizing a license plate in the frame. If the value is 0, the alarm will be generated after the track with a license plate is lost1 3600Info on unrecognized LPs
    ParameterValueDescription
    Object features
    Check in listsYes

    The parameter is disabled by default. If you want to use this detection tool detector to check in lists of vehicle license plates, select the  Yes value  value (see Configuring vehicle license plate recognition based on the created lists Checking in lists of LPs)

    No
    Record objects trackingYesThe metadata of the video stream is recorded to the database by default. To disable the parameter, select the No value value
    No
    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 Serverserver
    Second stream
    Other
    EnableYesThe detection tool detector is enabled by default. To disable the detection tooldetector, select the the No value value
    No
    NameLicense Plate Recognition plate recognition RR—ParkingEnter the detection tool detector name or leave the default nameAccuracy and performanceMedium accuracy and high performance
    High accuracy and medium performance
    Decoder modeAutoSelect a processing resource for decoding video streams. When you select a GPU, a stand-alone graphics card takes priority (when decoding with NVIDIA Nvidia NVDEC chips). If there is no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding
    CPU
    GPU
    HuaweiNPU
    Period of ignoring repeated recognitions
    		0

    Specify the period in seconds during which re-recognized license plates will be ignored. The value must be in the range [0, 86400]

    TypeLicense Plate Recognition plate recognition RR—ParkingName of the detection tool detector type (non-editable field)
    Advanced settings
    Accuracy and performance 


    		Medium accuracy and high performance

    Select vehicle recognition accuracy and performance:

    • Medium accuracy and high performance—provides medium recognition accuracy and high GPU performance (lower GPU load);
    • High accuracy and medium performance—provides maximum recognition accuracy and medium GPU performance (high GPU load)
    High accuracy and medium performance
    Calibration area height (m)0Specify the
    height of the calibration area in meters. The value must be in the range [0, 500]
    Calibration area width (m)0Specify the width of the calibration area in meters. The value must be in the range [
    0,
    500]
    Frame size change1920

    The analyzed frames are scaled down to a specified resolution (1920 pixels on the longer side) by default. The value must be in the range [640, 10000]. The following algorithm is used:

    • If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.
    • If the resulting resolution falls below the specified value, the algorithm stops, and this resolution will be used further.
    • If the resulting resolution still exceeds the specified value, it is divided by two until it is less than the specified resolution.
    Info
    titleNote

    For example, the source image resolution is 2048*1536, and the specified value is set to 1000.   In this case, the source resolution will be halved two times (512*384), as after the first division, the number of pixels on the longer side exceeds the specified value (1024 > 1000).   If detection is performed on a higher resolution stream and detection errors occur, we recommend reducing the compression.

    Initiate event in (sec)
    		0

    Specify the time in seconds after which an event must be generated after recognizing a license plate in the frame. If the value is 0, an event is generated after the track with a license plate is lost. The value must be in the range [1, 3600]

    Minimum recognition quality, in %80Specify the minimum quality of license plates plate recognition as a percentage. The higher the minimum recognition quality, the fewer false alarmsevents. The value must be in the range [0, 100]
    GDPR policy-

    By default, on the layout and in the archive, the characters of a license plate are completely hidden "GDPR ON". To display the characters of a license plate, you must enter a value:

    "-"—hide all characters (default value),

    " (blank field of a parameter value)"—show all characters,

    "N-"—hide the first N characters,

    "-N"—hide the last N characters,

    where N is the number of characters

    Speed detectionOff

    Select from the list the mode for determining the speed unit of vehicles.

    Note
    titleAttention!

    Margin of error in determining the speed of vehicles is about 5% with a good calibration, as this function gives only a general idea of the situation. The consumption of resources doesn't change when the Speed detection parameter is enabled.

    Info
    titleNote

    For the correct displaying of the speed measurement unit, you must create the MEASUREMENT_UNIT system variable (see Appendix 9. Creating system variable) and specify the value:

    • 0—to display kmph;
    • 1—to display mph.
    Kmph
    Mph
    Speed detection area height0
    Note
    titleAttention!

    Before you specify the value of the Speed detection area height parameter, you must select the area in the preview window (see Recommendations for configuring the speed detection area). 

     Specify the speed detection area height in meters. The value must be in the range [0, 500]

    Speed detection area width0
    Note
    titleAttention!

    Before you specify the value of the Speed detection area width parameter, you must select the area in the preview window (see Recommendations for configuring the speed detection area). 

     Specify the speed detection area width in meters. The value must be in the range [0, 500]

    Basic settings
    Algorithm for detecting vehicle directionBy LP coordinatesThe By LP coordinates algorithm algorithm is used by default. It works as follows: if the coordinates of the vehicle license plate shift from top to bottom (the vehicle moves towards the camera) and if the coordinates of the vehicle license plate shift from bottom to top (the vehicle moves away from the camera). Select the By LP scale change parameter if in the Surveillance window, the scale of the vehicle license plate increases (the vehicle moves towards the camera) and if the scale of the vehicle license plate decreases (the vehicle moves away from the camera)
    By LP scale change
    Yes

    The parameter is disabled by default. If it is necessary to determine all possible information from unrecognized license plates, select the Yes value

    Detection mode
    No
    ModeCPU

    Select the a processor for the detection tool operation—CPU or NVIDIA GPU detector operation (see Selecting Nvidia GPU when configuring detection toolsdetectors).

    Note
    titleAttention!

    It may can take several minutes to launch the algorithm on NVIDIA Nvidia GPU. You can use caching to speed up future launches (see Optimizing the operation of License Plate Recognition plate recognition RR and Vehicle Recognition recognition RR on GPU in Windows OS)

    Nvidia GPU 0
    Nvidia GPU 1
    Nvidia GPU 2
    Nvidia GPU 3
    Info on unrecognized LPs

    		Yes

    The parameter is disabled by default. If it is necessary to determine all possible information from unrecognized license plates, select the Yes value

    No
    Vehicle recognitionYes

    Theparameter is disabled by default. If you want to search for vehicles in the archive by vehicle make, model, vehicle class, or other specified criteria, select the Yes value (see see Search by LPs)

    No
    Country selection
    Country 1 name

    Armenia, Argentina, Austria, Azerbaijan, Bulgaria, Brunei, Belarus, Brazil, Belgium, China, Cyprus, Ivory Coast, Czech Republic, Germany, Colombia, Denmark, Estonia, Egypt, Finland, France, Georgia, Greece, Croatia, Hungary, Indonesia, Ireland, Italy, Kyrgyzstan, Kazakhstan, Lithuania, Luxembourg, Latvia, Malta, Malaysia, Mexico, Moldova, Myanmar, Netherlands, Peru, Poland, Portugal, Romania, Serbia, Russia, Sweden, Slovakia, Slovenia, Tunisia (starting with Detector Pack 3.13), Turkmenistan, Tajikistan, Spain, Ukraine, USA (starting with Detector Pack 3. 12), Uzbekistan, Vietnam, Not used

    		In the corresponding fields, select from the list one or more countries whose license plates you want to recognize
    Country 2 name
    Country 3 name
    Country 4 name
    Country 5 name

    In the window, specify the area in which license plate detection and recognition will be performed. You can adjust the area by moving the anchor points Image Removed. 

    Image Removed

    ...

    titleNote

    ...

    If necessary, in the preview window, you can set the calibration area or detection area (see Configuring calibration area and detection area).

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

    Configuration of the License plate recognition RR—Parking is complete. If necessary, you can create and configure the necessary sub-detectors on the basis of the License plate recognition RR—Parking (see Standard sub-detectors).