Lifesaver with infrared signature: ZF LIFETEC makes the seat belt visible to in-cabin cameras

“The significant role that in-cabin cameras already play in mobility is highlighted by the EU requirement, which came into force on July 7, 2026, mandating in-cabin camera-based fatigue and distraction detection in new vehicles to monitor driver attention,” Lutz added. However, it is not only the European Union that is placing increasing importance on reliable camera-based occupant detection. Euro NCAP is also giving greater emphasis to this technology, with the reliable detection of correct seat belt positioning being one of its key focus areas. This is exactly where ZF LIFETEC’s new “Infrared Belt” comes into play. The seat belt is one of the most important restraint systems in a vehicle and can only provide its full protective effect when worn correctly. With an infrared seat belt webbing specifically developed for camera-based occupant detection, ZF LIFETEC enables vehicle manufacturers to reliably determine whether the seat belt is positioned correctly. “Our new seat belt enables infrared cameras to more accurately identify whether an occupant is optimally protected. By doing so, we create the foundation for higher-quality occupant detection and significantly enhance safety for drivers, front passengers, and rear-seat occupants alike,” said Lutz.

Clear visibility for interior cameras

The new “Infrared Belt” from ZF LIFETEC is based on a targeted material design of the fabric. This involves combining different yarns which have specific spectral properties. They produce an integrated infrared signature that camera-based systems can clearly interpret. Cameras operating in this optical spectrum detect differences in the reflection and absorption of materials. Based on this physical principle, the seat belt stands out clearly from clothing, skin, or seat surfaces, regardless of lighting conditions inside the vehicle. The result is a stable, high-contrast signal that makes it possible to precisely determine the belt’s position. Series production is scheduled to begin in August 2026 – for all seating positions, including the rear seats.

Reliable detection independent of light and environment

Infrared cameras can track the path of the seat belt along the body (seat belt position). Based on this information, automakers can use intelligent detection algorithms to determine whether the seat belt is correctly routed over the shoulder or, for example, runs under the arm or behind the occupant’s back. Compared to traditional sensor systems, this approach therefore offers clear advantages: Seat belt buckle sensors, for example, only detect whether a seat belt is fastened – but provide no information about its actual protective effect. Only the combination of infrared sensors and an optimized seat belt fabric make it possible to clearly assess the actual seat belt position. The solution also proves to be more robust than conventional RGB cameras. Optical reflections or backgrounds of identical colors can hinder the detection of the belt’s path. Infrared-based detection, on the other hand, relies on clearly defined physical material properties, allowing the belt to be reliably identified regardless of clothing, lighting, or the environment.

Presentation at AIRBAG 2026

The new infrared seatbelt webbing for the driver, front passenger, and rear passengers is part of the product portfolio that ZF LIFETEC will present at AIRBAG 2026 (December 8 –10, 2026, in Mannheim). This international event is a key platform for passive safety and brings together automakers, suppliers, research institutions, and regulatory agencies.