Werbung
Verfügbare Sprachen
Verfügbare Sprachen
As can be seen from these figures, the horizontal angle of the camera should not be more than 20°
from the vehicle's axis and the vertical angle should not be more than 30°.
The greater the angle, the more the characters will be distorted. This distortion makes recognition
more difficult, and therefore significantly impairs the recognition rate. The human eye can still read a
character even when observing from large angles, since the brain can interpret what it sees and can
read correctly with the aid of this additional information.
A camera-based character recognition system does not have this much intelligence. The more the
line widths and sizes of the individual letters and numbers differ from those that would be seen when
pictured from an angle of 0°, the more difficult it is for the system to read them correctly.
For this reason, you should always try to achieve the smallest possible horizontal and vertical angles
when choosing the location of the camera.
It is possible to calculate the acceptable distance between the camera and the number plate from the
erection conditions given by the place of use, and from the maximum permitted angle.
The system already makes the maximum possible use of the retroreflective properties of number
plates, because camera and illumination are installed right next to each other. Additionally, the
daylight blocking filter minimizes glare by sun and headlights. The powerful illumination guarantees
bright illumination even over longer distances.
User manual
40
Back to the
table of contents
Werbung
