Some reflective vests that are commonly sold here are not visible in the dark. Researchers from BUT in Brno found this. These are, for example, vests bought at the market. Although they have a label about the atheists, they are still not working. The obligation to wear reflective elements in the dark has pedestrians outside the village for more than a year.
Researchers at the Faculty of Electrical Engineering and Communication of BUT test the reflective high visibility vests directly on the field. They use a special camera with a camera to create a so-called bright map. It depicts how much the character is at night in contrast to the surroundings. “What you see here is a luminous analyzer, which is built on a digital SLR camera, which is specially adapted for this case, and the photo is analyzed by the software,” explains the head of the Jan Skoda Lighting Laboratory.
Two figurants went into the dark, 80 meters from the car. At such a distance, it must be seen that the driver has reacted to the pedestrian at speeds of about 90 km. The technician with the device in the car is focused, photographed and analyzed. “There is only one safety vest visible from the bright map, the other one can not be seen,” Jan Skoda said.