Select the traffic direction for license plate recognition

By default, the LPR channel recognizes license plates of all vehicles passing the camera FOV: moving toward the camera and away from it. You can set the module to recognize and save the license plates of vehicles moving in certain direction: from the camera, to the camera, or 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 is generated. You can disable this event. If the direction of vehicle movement is undefined, the Entered the oncoming lane alarm event isn't generated.

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

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

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

     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, select the traffic direction relative to the camera in which it is necessary to recognize the license plates.

   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 to display the direction as Undefined in the Vehicle Tracer module if it is impossible to determine the vehicle direction.

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

   Note

   The following variations are possible depending on the selected traffic direction:

   • If you select the to the camera direction and set the Record violation checkbox, the recognition is performed in both directions; if the movement is from the camera, the alarm event is generated.
   • If you select the from the camera direction and set the Record violation checkbox, the recognition is performed in both directions; if the movement is towards the camera, the alarm event is generated.
   • If you select the to the camera direction and the Record violation checkbox is clear, the recognition is performed only in the direction of the camera.
   • If you select the from the camera direction and the Record violation checkbox is clear, 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.
   

   Note

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

7. Click the Apply button to save the settings.

The direction of traffic movement for license plate recognition is selected.