FACE IMAGE CAPTURING DEVICE AND DRIVER CONDITION DETERMINATION DEVICE

摘要

In a face image capturing device, a focal point of a fixed-focus in-vehicle camera is set to a position where a circle of confusion with respect to a foremost face position is larger than the circle of confusion with respect to a rearmost face position. The rearmost face position is where the driver's face is positioned when a driver's seat is moved to the rearmost limit. The foremost face position is where the driver's face is positioned when the driver's seat is moved to the foremost limit. When the focal point of the in-vehicle camera is set to the above position, the focal point can be moved rearward to reduce the blurring of a face image at the rearmost face position. Even if the blurring of the face image at the rearmost face position is increased, a driver condition can be accurately determined at all times.

主权项

1. A face image capturing device that is mounted in a vehicle capable of permitting a driver to adjust a position of a driver's seat in a front-rear direction and is used to capture a face image of the driver from the front of the driver, the face image capturing device comprising:
an image sensor that generates image data of the face image; and an imaging optical system that forms the face image on the image sensor, wherein a focal point of the imaging optical system is fixed at a position where a circle of confusion with respect to a foremost face position is larger than the circle of confusion with respect to a rearmost face position, the rearmost face position being where the face of the driver is positioned when the driver's seat is moved to a rearmost limit, the foremost face position being where the face of the driver is positioned when the driver's seat is moved to a foremost limit.