Viewing angle restrictions, Framing the camera image – Paxton SONY number plate reader User Manual

Page 6

Page 6

Viewing angle restrictions

Set the zoom and focus so that a sharp image of the plate fills about one third of the screen width.

You should also consider if high or wide vehicles may block the view of a close following second vehicle.

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To maximise reliability:-

1. The vehicle must be stationary at the capture point.

2. The barrier has vertical IR reflective banding with no additional lettering or logo.

3. The barrier or IR marker and the number plate are both in focus within the cameras field of view.

4. The camera location conforms to the height and lateral angle limitations.

5. The barrier image is in the top part of the screen. This stops the plate being obscured if the

vehicle should stop short of the barrier.

6. The barrier forms no more than one sixth of the total image height.

7. The vehicle should move out of the field of view within 10 seconds of the data capture to

re-establish the background reference data for the system.

Framing the camera image

4 m

1.5 m

10 m

3 m

15 m

5 m

4 m

2.5 m

10 m

4 m

15 m

6 m

Calculated distances at the 20° maximum

Focus Distance (F)

Maximum offset from the

number plate centre (O)

Calculated distances at the 25° maximum

Focus Distance (F) Maximum height above the

number plate centre (H)

The sum of the height and lateral angles

when combined must not exceed 40°.

25° maximum

vertical angle

20° maximum

lateral angle