Press Release 085/2018

Networked Lighting: Away with the Blind Spot

KIT Researchers Want to Make Road Traffic Safer by Interconnecting Street Lighting and Headlights in Particular of Autonomous Vehicles
2018_085_Weg mit dem blinden Fleck_72 dpi
The camouflage effect (left) makes pedestrians invisible for car drivers in spite of good lighting. Smart interconnection of headlights and street lighting reverses this effect (right) and enhances safety. (Photo: Markus Breig, KIT)

It is a horror scenario for every car driver: suddenly, a previously invisible pedestrian comes out of the dark between two street lights or the shade of two parked cars. Researchers of Karlsruhe Institute of Technology (KIT) are working on a method to optimally adapt car headlights to local conditions with the help of external sensors that may be located at the roadside or in other vehicles.

When lighting conditions blur the contrast between an object and its surroundings, experts refer to it as the “camouflage effect.” The human eye cannot perceive the object under these conditions. The same applies to camera eyes of autonomous vehicles.


The “Propix” (the acronym of projector pixel light) headlight developed at KIT’s Light Technology Institute (LTI) a few years ago was the point of departure of the scientists. Propix can adapt its light distribution to the environment, i.e. suppress certain areas completely, whereas others are illuminated brightly. Now, the researchers are working on interconnecting Propix with other ultrasonic, radar or lidar (using laser radiation instead of radiowaves) sensors of the car. In case the sensors detect an obstacle located in a blind spot of the eye or camera, the headlight is to react autonomously and to illuminate the spot or dim the light. “By combining stationary street lights with variable headlights, optimum visibility will be achieved,” Professor Cornelius Neumann, Head of LTI, says.


Cornelius Neumann forscht am KIT zur intelligenten Straßenbeleuchtung.
Cornelius Neumann conducts research relating to smart street lighting at KIT. (Photo: Markus Breig, KIT)


And the goal is far more ambitious: Propix control is to be supplied not only with information from sensors of the own vehicle, but also from sensors on board of other vehicles or at the roadside. “The challenge consists in the interaction between the different sensors and the headlights,” Neumann says. Transferred to humans, the scientists want to equip the car with additional sensory organs. “No matter whether we see a person coming our way or we only hear this person’s steps, the information is the same: Somebody is approaching us,” Neumann explains. “If we can equip a car accordingly, we can make road traffic safer.”

The researchers plan to test their new technology on the Baden-Württemberg Test Area for Autonomous Driving that was opened in Karlsruhe in May this year. The project OpEr (Optimization of visibility of pedestrians based on interconnected infrastructure), hence, will be one of the first research projects executed on this area. For this, funding is granted by the state government.

Short video:

Explanation of the short video: In case of the camouflage effect, lighting conditions blur the contrast between an object and its surroundings. In road traffic, this may have fatal consequences. Researchers of KIT want to enhance safety by interconnecting headlights and street lighting. The pedestrian on the left between the two street lights is hardly visible. Evaluation of the interconnected sensor images enables the high-resolution headlight to adapt light distribution and to make the pedestrian stand out from the background as a negative projection. For comparison: The woman on the front right that is not illuminated by the smart headlight remains barely visible.  


More about the KIT Information · System · Technologies Centre:



Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 10,000 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,800 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

mex, 18.07.2018

Margarete Lehné
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