In order to inhibit artifacts a visual processing device is provided with a spatial processing portion extracting surrounding image information US from an input image signal IS, and a special image detection portion outputting a special image effect adjustment signal DS according to a degree of a statistical bias of the image signal IS. The apparatus includes a light source configured to emit light to the subject and an image sensor configured to receive light reflected from the subject. The dispensing valve has an end portion which is normally closed, opening under pressure of fluid from the pump. The DDD is slideably attached to a seat belt of the vehicle such that the dynamically deployed device, when deployed, slides along the seat belt and is held in position by the seat belt.