This page contains a Flash digital edition of a book.
14 traffic and transport
to a toll system,’ says Scholz. As well as security and tolling lanes,’ explains Scholz. The systems systems and eliminates the need for
TollChecker Freeflow provides a applications, ANPR can also be used also use LED infrared high-power installing ground loops.
single-gantry solution that doesn’t for speed enforcement. By capturing flashes, which are invisible to the ‘The reliability and accuracy of the
interfere with traffic, thereby the time taken between two or three driver and produce high quality system is of paramount importance,
reducing congestion and improving points, the average speed can be images. as it is collecting sensitive data,’
safety – vehicles switching lanes determined and violators captured. Infrared light reflected from states Scholz.
when approaching a toll plaza can ‘ANPR and lidar technology are passing vehicles can also be used Blom of Abstract Computing
be a source of accidents. considered much more accurate as a trigger. JAI’s IIT (In-Image International agrees: ‘The first
Vitronic’s systems use cameras than radar-based detection, which Triggering) Camera System uses this challenge with developing an ANPR
manufactured in-house, and lidar can have limitations when vehicles technology, which is more reliable system is finding the number plate,
technology to trigger the camera. are driving in parallel over multiple than software-based triggerless as colour, size, position, as well
as the body text will differ with
different licensing schemes.’ Once
m
.
c
o
the software has recognised the
t
o
e
n
number plate, optical character
.
l
e
m
w
w
recognition (OCR) is used to read
w
the text. ‘In order for the plate to
be read accurately the picture must
be of a high enough resolution for
the text to be identified by the OCR
software,’ he says.
However, Scholz notes that
several medium resolution cameras
provide sufficient image quality for
the software to read the number plate
over multiple lanes without having
Ready to meet
to deal with the large amounts of
the world’s
data involved with higher resolution
cameras. He adds: ‘It’s not just the
most fl exible
resolution that’s important, but the
entire dynamics of the camera, as
infrared cameras?
the technology has to handle factors
such as glare from direct sunlight
Perfect vision day and night
and vehicle headlights.’
‘Currently, the main limitation for
ANPR concerns data protection and
many European countries are not
using ANPR on their roads for this
om
reason,’ says Scholz. ‘However, the
ope.c
ability to provide speed enforcement
eur
information gives a big boost to the
.imv
technology, and, in Germany as
www well as in other European countries,
Gobi-���
ANPR is a growing market sector.’

2009 
ch
Hearn of Stemmer Imaging
suggests a final challenge for
machine vision companies targeting
Imagine the invisible
the traffic and transport market:

f
ebruary/mar
‘The real challenge is for technology
ope companies to understand what
users require from machine vision,
and for users to understand what
technology companies can supply.
Most traffi c accidents happen at night. Integrating night vision and obstacle
It’s only through machine vision
detection into the driving process helps save lives. Integrating Xenics’ Gobi
infrared cameras into these systems brings sensing to the next level.
companies talking to potential
Small, smart cameras with a unique on-board and real-time Digital Signal
customers in the traffic sector that
Processor (DSP). Cost-eff ective. Also available as modules. www.xenics.com the use of digital camera technology
will increase.’
imaging and machine vision eur
20090218 ad_195x135_image&machin1 1 18-02-2009 09:47:47
IMVEfeb09 pp12-15 traffic.indd 14 18/2/09 11:12:32
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