PULSE WAVE DETECTION DEVICE, VEHICLE DEVICE AND PULSE WAVE DETECTION METHOD

The object is to appropriately detect a pulse wave even if brightness is changed due to movement of a subject with respect to lighting. When a face gets closer to a camera with a lighting device, brightness increases, and the size of the face on the camera image increases, while to the contrary, when the face moves away from the camera with a lighting device, the brightness reduces, and the area of the face also reduces. Since the brightness and face size have this correlation, a pulse wave detection device 1 detects the face from a frame image and corrects the brightness of the face in accordance with the size of the face surface. The brightness of the face depends on the distance between the lighting and the face, and this is equal to indirect measurement of the distance from the lighting to the face using the size of the face. As described above, a pulse wave detecting device 1 estimates/measures a pulse rate of the subject from a brightness signal after intensity of the brightness of the face photographed on the frame image is corrected using the size of the face, by using the correlation between the size of the face of the subject on the frame image and the change in the brightness.