11
GeneralFieldofView(FOV)Considerations
TheVersiCamWirelesssystemdoesnotprovidelivevideotothecabi net.Allvideodetectionprocessing
is performed in the Camera Processor unit. Detection data is send to the ICC‐2W to activate the
appropriate outputs. The system provides snapshots of the FOV to facilitate the setup of the camera,
pleaserefertoSection4.4formoredetailonFOVsetup.
• NohorizonintheFOV
• Enoughcameraangletopreventsunlightfromdirectlyhittingthecameralens,especiallyon
eastandwestfacingapproaches
• PreferredwidthofatleastthreelanesintheFOV,withtwolane
detectioncapability
• Cameraviewcenteredovertheroadwayapproach
• Enoughmountingheighttoavoidcrosstrafficocclusion
TheVersiCamWirelessCameraisequippedwithalensprovidingahorizontalfieldofview(HFOV)of85
o
.
This permits the camera to be mounted in traditional ‘across the intersection’ locations as well as on
polesnearthestopbarorattheadjacentcorner.
To provide an acceptable field of view the closer the camera is tothe stop bar the higher the camera
needs to be
positioned. The following tables details mounting height requirements for installation at
twoandthreelaneapproaches.
10' 13' 15'
19.5' 16.7' 14.5' 12.5' 12'
18' 15.0' 12.4' 9.9' 11'
16.5' 13.1' 10.2' 6.9' 10'
15' 11.2' 7.5' 0' 9'
LaneWidth
Camerato
StopBar
MountingHeights‐3LaneApproach
RequiredCameraSetbacks
10' 13' 15'
13' 8.3' 1.0' 0' 12'
12' 6 .6' 0' 0' 11'
11' 4 .6' 0' 0' 10'
10' 1 .0' 0' 0' 9'
Camerato
StopBar
LaneWidth
RequiredCameraSetbacks
MountingHeights‐2LaneApproach
Note:
The values in the tables above represent the ‘minimum’ camera setback for various mounting heights
and required FOV widths. Other variations are possible. The key is to remember that for accurate
detection where the attained camera FOV compliments the vehicle size where the algorithms will
performthe best, a
minimumof3 laneswidthsshould bevisiblewhen takingasnapshot imageofthe
intersection.
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