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Preparing for Installation
5
VIS-CAM Systems
2
Preparing for installation
2.1
Installation Preparation
To prepare for installation, consider the fundamental requirements for an effective deployment of the Vehicle
Imaging Subsystem. There are two basic ways to position the camera: over the lane or beside the lane. Figure 3
and Figure 4 depict a typical over-lane installation. Figure 13 and Figure 14 depict a typical beside-lane camera
installation.
2.1.1
Over Lane Positioning
Over lane camera mounting is always employed when the road width being monitored contains more than two
lanes of traffic, when a convenient overhead structure is already in place, or when preventing vandalism is a
paramount concern.
The VIS’s varifocal (zoom) lens is adjusted during installation to create 135 pixels across a 1
foot wide license plate (standard for US style of plates, may differ by region) placed 2 feet
above the ground level at the nominal trigger position (loop or light curtain, etc.). This
resolution maximizes license plate reader, vehicle matcher, or other image processing
techniques performance. The highest performance from the subsystem is achieved when the
variation in plate size is kept to within ± 5% which typically means that the vehicle trigger
accuracy should be within ± 1 foot (@ trigger plane defined by client.) at all speeds. Low
latency vehicle triggering is very important and should not be overlooked. Please contact JAI
for support on this issue.
Figure 3.
Typical Over Lane Site Layout
Summary of Contents for VIS-CAM System
Page 1: ...VIS CAM System Vehicle Imaging Subsystem Document Version 10436 Document P N E...
Page 2: ......
Page 12: ...VIS CAM Systems xii List of Tables...
Page 20: ...VIS CAM Systems 8 Preparing for Installation Figure 5 VIS 300 U S Camera options chart...
Page 21: ...Preparing for Installation 9 VIS CAM Systems Figure 6 VIS 350 U S Camera options chart...
Page 22: ...VIS CAM Systems 10 Preparing for Installation Figure 7 VIS 400 U S Camera options chart...
Page 23: ...Preparing for Installation 11 VIS CAM Systems Figure 8 VIS 500 U S Camera options chart...
Page 24: ...VIS CAM Systems 12 Preparing for Installation Figure 9 VIS 300 European Camera options chart...
Page 25: ...Preparing for Installation 13 VIS CAM Systems Figure 10 VIS 350 European Camera options chart...
Page 26: ...VIS CAM Systems 14 Preparing for Installation Figure 11 VIS 400 European Camera options chart...
Page 27: ...Preparing for Installation 15 VIS CAM Systems Figure 12 VIS 500 European Camera options chart...
Page 92: ...VIS CAM Systems 80 Appendix B Figure 90 Lane controller setup...
Page 100: ...VIS CAM Systems 88 Appendix E Figure 98 Operation configuration of Serial port 1...
Page 110: ......
Page 111: ......