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By default, the LPR channel recognizes the LP numbers license plates of all vehicles passing the camera viewing zone: i.e. FOV: moving toward the camera and away from the camera. The module can be set to recognize and save the LP numbers license plates of the vehicles moving in certain direction: F rom from the camera, To to the camera, Any any. The following results can appear as an outcome of the vehicle movement direction recognition: From the camera, To the camera, Undefined.

If traffic direction is set, then by default, if the direction of vehicle movement does not coincide with the specified value, the Entered the oncoming lane alarm event will be is created. This event can be disabled. If vehicle movement direction is undefined, the Entered the oncoming lane alarm event is not created.

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To select the direction of traffic for LP number license plate recognition, do the following:

1. Go to the settings panel of the LPR channel object settings panel, corresponding to the activated module module (see Activating the software module used for identifying the plates).
   
2. From the Direction calculation drop-down list (1), select the mode of determining the vehicle's movement direction:
   • by LP position—the direction is determined by the position of the upper part of the LP numberlicense plate. If the upper part of the LP number license plate at the start of tracking is lower than the upper part of the LP number license plate at the end of tracking, then the direction is defined as From "from the camera", otherwise—To "to the camera".
   • by LP area—the direction is determined by the license plate area. If the LP license plate area at the start of tracking is larger than the LP license plate area at the end of tracking, then the direction is defined as From "from the camera", otherwise—"To the camera".

   • by SDK—the direction is determined by the SDK.  CurrentlyCurrently, the following LP license plate recognition modules support this mode: RR, VT, AUTO-Uragan, IV.

     Info
     title Note
     If the direction of movement is detected incorrectly or the license plate recognition stops, it is recommended to select the by LP area mode.

3. From the Direction drop-down list (2), select the select the traffic direction relative to the camera in which it is necessary to recognize the LP numberslicense plates.

   Info
   title Note
   For the RIDR IV and CIDR IV modules, the direction of carriages in the camera view is selected from left to right or from right to left.

4. Set the Undefined checkbox (3) to display the direction as Undefined in the Vehicle Tracer module, if it is impossible to determine the vehicle direction.

5. If the from the camera or to the camera value is selected in the Direction drop-down list, the Record violation checkbox becomes available (4). By default this checkbox is set. That means that if the direction of vehicle moving movement doesn't coincide with the specified value, the Entering an oncoming lane alarm event will be is created. If this event should must not be created, clear the checkbox.

   Info
   title Note
   The following variations are possible depending on the selected traffic direction: if the to the camera direction is selected and the Record violation checkbox is set, the recognition is performed in both directiondirections; if the movement is from the camera, the alarm event will be is created; if the from the camera direction is selected and the Record violation checkbox is set, the recognition is performed in both directiondirections; if the movement is towards the camera, the alarm event will be is created; if the to the camera direction is selected and the Record violation checkbox is not set, the recognition is performed only in direction to the camera; if the from the camera direction is selected and the Record violation checkbox is not set, the recognition is performed only in the direction from the camera.

6. If you want the LPR channel to record the direction of vehicle movement as Entrance to the territory, set the Entrance checkbox (5).
   

   Info
   title Note
   This setting is taken into account in WEB Report System PSIM when working with AUTO reports (see WEB Report System PSIM. User Guide).

7. Click the the Apply button (56) to save the settings.

The vehicle traffic movement direction is now selected.