As cars take on more of the driving — lane-centering, hands-off assistance — a new question becomes safety-critical: is the human still engaged and capable of taking back control? Driver monitoring systems answer it, traditionally by watching the eyes and head: where is the driver looking, are their eyes open, is their head pointed at the road? A 2024 Magna grant pushes past gaze into something more intimate — the driver's heart rate.
The record: on April 9, 2024, Magna Electronics Inc. was granted US11951993B2, a “Vehicular driver monitoring system with driver attentiveness and heart rate monitoring.” The CPC classes pair driver-condition estimation (B60W 40/08, B60W 50/14) with face-and-gaze vision (G06V 40/162, G06V 20/597) and a notable addition — G06T 7/74 image processing used to extract a physiological signal. The camera is reading the body, not just the gaze.
Here is the mechanism, and it is cleverer than it sounds. A camera can estimate heart rate without contact, by detecting the tiny, periodic color changes in facial skin caused by blood flow with each beat — a technique called remote photoplethysmography. The same driver-facing camera that tracks attentiveness can, with the right processing, also recover heart rate. So the system gets a physiological channel for free, using hardware that is already there.
Why add heart rate to attentiveness? Because where a driver is looking does not tell you everything about their state. Heart rate can hint at drowsiness, acute stress, or a medical event — conditions that affect a driver's ability to take over but might not show in gaze alone. Combining the two gives a fuller picture: not just “are they looking at the road” but “are they physically in a state to drive.”
Trace it to the product and the significance is the handoff problem. The hardest moment in partial automation is when the car needs the human back — and that only works if the human is ready. A monitoring system that reads both attention and physiology is trying to know, before that moment arrives, whether the handoff is safe. It is the safety system treating the driver as a monitored variable, which is uncomfortable and probably necessary.
The skeptic's caveat: camera-based heart rate is an estimate, sensitive to lighting and motion, and a granted method is not proof it works reliably in a moving car. Reading physiological state raises real privacy questions too. But the direction is honest about the central truth of partial autonomy: the system is only as safe as its model of the human. A 2024 Magna grant shows that model getting richer — from where you look to how your heart is beating.