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The adjustment of the camera and lenses is a crucial step
in the installation. If they are not adjusted properly, this can
significantly undermine the system's performance.
To carry out the adjustment correctly, Sony recommends
the use of the Web User Interface provided by the Camera.
With this Interface, the video streams provided by the
camera can be visualized on a laptop without any main
software installation. It allows appreciating the quality of the
framing, the camera adjustments, and lens adjustments.
To adjust these settings on sites with a low volume of
traffic, the installer may find it useful to do a test drive with
his own vehicle and/or to put a number plate on the road at
the spot where the number plates are to be read.
Introduction: Lens description
The lens is important for the image quality provided to the
system and for the overall performance of the system.
Refer to the Operating Manual to locate the lens inside the
XCI-NPR.
• ZOOM:
The Zoom should be used to have a licence plate size
corresponding to the description made in the section
below, Adjustment of the lens.
• IRIS:
Outdoor installation:
Setup the iris accordingly to the below picture:
Adjustment of the camera
Zoom
O
Iris
C
Focus
Note that there is no mark on the lens so the setup of the
iris is complex. For long range installation (above 10
meters), open a little more the iris if needed.
Indoor installation: set the shutter speed value to 1/1000
and adjust the iris in order to have the best contrast
between the licence plate background and the characters.
The best contrast is a strong white and a strong black on
a new/cleaned licence plate. Beware to not overexpose
the licence plate.
Please refer
to section
"Web User
Interface"
chapter
"General Tab"
section
"Shutter
speed" for more
information
• FOCUS:
The focus should be used with the Zoom, in order to set
the image in focus at the appropriate distance.
Adjustment of the lens
The software provides excellent performances when the
plate's characters are around 14 pixels width in the image.
Fewer than 14 pixels, some looking like characters like the
"8" and the "B", the "S" and the "5" or the "Q" and the "O"
cannot be distinguished.
Ideally, the width of the number plates at the moment
where they leave the screen should be a third of the image
width (for countries where there are narrow plates with few
characters like Italy Switzerland, Belgium or Monaco, and
with these small plates, zooming is required and 16 meters
will not be reached (maximum distance may decrease
down to 12-13 meters).
Warning: As the setup of the image is done through
IP,
the
image
has
approximately 1 or 2 second. The installer must
operate slowly and carefully while setting up the lens
position. Note that this is a common effect on IP
cameras.
Tip: To faster the process, you can "hide" for 1sec the
image with your hand in order to release the CPU load.
The priority is given to the recognition instead of the
image display. So when a licence plate is in the image,
the delay to send an image is increased a little (but it
doesn't affect the speed of the outputted licence plate
string).
delay
while
displaying,
Page 19 / 42
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