In one embodiment, a system of detecting seat belt operation in a vehicle includes at least one light source configured to emit a predetermined wavelength of light onto structures within the vehicle, wherein at least one of the structures is a passenger seat belt assembly having a pattern that reflects the predetermined wavelength at a preferred luminance. At least one 3-D time of flight camera is positioned in the vehicle to receive reflected light from the structures in the vehicle and provide images of the structures that distinguish the preferred luminance of the pattern from other structures in the vehicle. A computer processor connected to computer memory and the camera includes computer readable instructions causing the processor to reconstruct 3-D information in regard to respective images of the structures and calculate a depth measurement of the distance of the reflective pattern on the passenger seat belt assembly from the camera.

A seatbelt device, including: a seatbelt formed in a belt shape; a tongue plate through which the seatbelt has been inserted; a buckle that is provided at one side in a seat width direction of a vehicle seat, with the tongue plate being attachably and detachably anchored to the buckle; and a belt-end anchor section that is provided at another side in the seat width direction of the vehicle seat, and that includes a separation operation portion, with an end portion of the seatbelt being anchored to the belt-end anchor section and the end portion of the seatbelt becoming separable as a result of an occupant of the vehicle operating the separation operation portion during a vehicle emergency.