Page 32
VIS CAM 300/400 Installation Manual
System Set-Up
4.1.2 Select a Suitable Vehicle, License Plate, and Plate Stand for the Setup
To accurately set up the Vehicle Imaging Subsystem, the system installers need access to:
1.
A vehicle that can be temporarily parked on the road
2.
A plate that is:
a. typical in size and color for the site
b. clean, flat and in “like new” condition
3.
An adjustable plate stand that allows the plate to be mounted in a vertical plane, at various heights
above the road, and at variable roll angles. The stand must allow the plate to be placed at both the
nominal plate height and the minimum expected plate height. The stand must also allow the plate to
be rolled at least + or – 10 degrees from horizontal but held firmly in place once a specific roll angle
is selected. The stand should be heavy enough so that the wind will not blow it over or move it.
TABLE 11.
Typical minimum plate heights and nominal plate heights:
4.1.3 Select the Camera to Align
•
If the site employs a single camera per lane, then you can choose any lane to start the alignment
procedure.
•
If the site employs multiple cameras regularly spaced across a roadway to provide continuous field-
of-view coverage from edge to edge, select one of the cameras at either edge of the roadway to be
the first camera to align.
•
Align all remaining cameras in order from the first camera aligned to the last camera at the other
side of the roadway. The next camera aligned is always the one adjacent to the camera most
recently aligned.
4.1.4 Validate the Installation Geometry
The VIS cameras and vehicle trigger line should have been installed at the locations agreed to by you
and JAI. Typically JAI utilizes a specially developed Excel worksheet to confirm the suitability of the
equipment placement at the site from an image processing perspective. See Figure for an example
worksheet. However, equipment is often not located where the worksheet specifies. It is therefore
imperative that the actual equipment layout at any given site be measured to verify that the cameras and
trigger are located at the desired locations relative to each other. If necessary, move the camera/trigger
positions until the distances required in the worksheet are met. If it is not possible to move the
equipment to the required locations, then the impact of any changes to the subsequent image processing
must be assessed. Enter the actual camera locations into the Input section of the JAI worksheet and then
note the changes in the Results section. If there are any questions about the suitability of a specific
camera/trigger layout, contact your JAI representative for advice.
Plate Height
Front of Vehicle
Back of Vehicle
minimum (bottom edge)
8in or 20cm
15in or 38cm
nominal (middle)
16in or 40cm
24in or 60cm
Summary of Contents for Vehicle Imaging Subsystem 300
Page 2: ...Page ii Vehicle Imaging Subsystem 300 400 ...
Page 12: ...Page xii List of Tables ...
Page 114: ...Page 102 VIS CAM 300 400 Installation Manual ...
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