2/4-Channel Cam Viewer E-series for Automatic License Plate Recognition
CV7-LP
8
Chapter 2. Camera Installation
The precision of the CV7-LP’s recognition depends on many factors, including: the image
quality in the video, the pixels counts shown, user applications, camera installation, etc.
Below are a few guidelines to take into consideration when installing your camera device:
1)
Shooting Angle of the Camera:
the shooting angle of the camera to the license place
should range from 10° to 45°, as shown in the illustration below:
2)
Frame Rate in the Video Stream:
Your camera device’s frame rate should be set to 25fps or 30fps or higher.
3)
Shutter Speed:
The shutter speed on your camera device should be faster than or equal to 1/100 or
1/120 seconds.
4)
Shape of the License Plate:
The shape of the license plate captured in your video should be as similar to a
rectangle as possible.
5)
Height of Characters and Distance between Characters on License Plate:
When captured by your camera device, the height of the characters should be taller
than 40 pixels, and the distance between characters should be wider than 4 pixels.
6)
Image Quality:
Image quality is critical for the CV7-LP’s recognition function to work properly. Please
make sure the exposure, sharpness, and color presentation of the image captured by
your camera device is adequate.