I found this. Seems to be using cameras and I feared but note that the disclaimer says performance is based on technical and environmental conditions.
The Driver Monitoring System – Driver Focus keeps a watchful eye over the driver to help ensure their attention is focused on the road ahead.
www.subaru.com.au
Driver Monitoring System – Driver Focus1 (DMS)
The Driver Monitoring System – Driver Focus keeps a watchful eye over the driver to help ensure their attention is focused on the road ahead. Using an infrared LED and a camera, the system monitors the driver for signs of inattention or sleepiness and if detected, warns them to refocus their attention. The innovative system can also recognise up to five individual drivers, memorising their preset preferences and adjusting the cabin environment for both their safety and comfort
No matter how diligent you are as a driver, distractions can happen at any moment. That’s why Subaru’s revolutionary Driver Monitoring System – Driver Focus keeps a watchful eye over the driver to help ensure their attention is focused on the road ahead. Using an infrared LED and a camera, the system monitors the driver for signs of inattention or sleepiness and if detected, warns them to refocus their attention. The system’s intelligent facial recognition also recognises up to five individual drivers, memorising their preset preferences and adjusting the cabin environment – including climate control, instrument settings and Multi Information Display screen - for both their safety and comfort.
1. Driver Monitoring System performance and capability dependent on environmental and technical conditions. Refer to Owner’s Manual for full details.