Documentation for Auto PSIM 1.0.1.

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The following video camera requirements should be met in order to ensure the recognition of license plate numbers using the Auto PSIM system.

№

Property

Range

Comment

1

Camera type

Analog color PAL camera, or analog monochrome CCIR camera

IP cameras with not less than 25 fps and 4 Mbit/s bitrate also can be used.

2

Camera resolution

Not less than 320x240


3

Illuminance in the monitored area

Not less than 0.02 lux


4

Signal/noise ration

50 dB or more


5

Auto aperture and auto electronic shutter

1/1000


6

Focal length

4-8 mm for 1/3'' CCD
Lens with adjusting focal length and auto aperture can be used.


It is not recommended to use the frame resolution more than 352 x 288 (CIF) because it will result in large spend of resources and video will be compressed until 352 x 288 (CIF).

The video camera should be located at the top of the lamp pole at the edge of the road (side location), or at the horizontal truss above the road (central location).

If the camera meets the main requirements (see the General requirements for mounting and configuring of cameras section) and is aimed at the recommended directions, up to six lanes can be processed in case of a central camera location, and up to four lanes in case of a side location.

If recommendations for parameters, mounting and configuring video camera are fulfilled, the typical error of counting the following characteristics will be as follows:

  • 5% − while determining number of vehicles;
  • 10% − while determining average speed of moving;
  • 10% − while determining average distance;
  • 10% − while classifying vehicles.

Note.

Depending on conditions of monitoring and factors of video camera mounting/configuring, errors can differ from typical error.

Conditions of applicability of the Traffic Detection module are following:

  • visibility of vehicle or vehicle headlight (at night) − not less than 50m;
  • speed of vehicle − more than 20 km/h;
  • statistical sampling − not less than 1000 vehicles.

When mounting the Traffic Detection cameras, follow these recommendations:

  1. Mount the cameras at a height of 8 to 20 m.

    Note.

    Optimum camera height is 12 m.

  2. Mount the cameras not farther than 3 m from the road edge.
  3. Horizon is not to be in the camera visibility scope.

The camera operates properly if its viewing zone contains not less than 25 m of road length, and the road in the image is as close to vertical as possible. The figure shows the road image if the camera is mounted at the recommended location. 

The following figure shows the maximum allowable deviation of the road image from the vertical line (30 degrees).

The camera mount should have two degrees of freedom, which allows it to adjust its orientation in the directions shown in the following figure.

The camera can be tilted and rotated during its mounting and setup.

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