TRANSPORT
Imaging simplifies road lighting inspection
Dr Constantinos Bouroussis, a tunnel lighting expert and a research associate at the National Technical University of Athens’ Lighting Laboratory, describes a mobile imaging system developed to inspect tunnel and road lighting
The measurement system can be attached to a car A
ccording to European and international standards relating to
illumination of roads and tunnels, validating lighting levels is mandatory for safety purposes. As part of my PhD, I developed an imaging system that measures road surface luminance in real time. Te system was designed so that motorway operators,
motorway maintenance service providers and engineering companies can gather data to ensure road and tunnel lighting adheres to the standards. Te system has been used to
validate lighting in more than 60 road tunnels and tens of road interchanges around Greece and the Balkan countries, and further projects are being negotiated in
other countries. Te results of these tests were used to support the official delivery of lighting installations, or to redefine and reschedule maintenance plans for lighting equipment. Te imaging system device was
developed using machine vision technology and specialised image processing techniques. It can be installed on any vehicle without modification. Te images are recorded as the vehicle moves through the tunnel at normal driving speeds – around 40- 60km/h. Several images are captured, resulting in a full scan of the
tunnel or road section. Te system adapts to changing illumination levels, especially in tunnel lighting, ensuring accurate measurements. Te results and the quality indices can be exported in real time, and it takes less than a minute for each passage through the tunnel. Te equipment traditionally
used for collecting this data is time-consuming to operate and designed mainly for laboratory measurements, limiting their use to external field tests. Tis work would also normally require partial or total interruption of traffic flow while the tests were
Variation of road surface luminance in a typical tunnel 28 Imaging and Machine Vision Europe • August/September 2018
Typical region of interest in a tunnel scene @imveurope
www.imveurope.com
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