照明認識視空間への初期視覚情報の影響

Abstract

People can immediately understand how a room is illuminated when s/he enters the room. The state is called that s/he got the Recognized Visual Space of Illumination (RVSI) for the room. To get a RVSI one utilizes the appearance of objects and light source in the room as the initial visual information. One can suppose then that a RVSI can be altered by changing the initial visual information such as lightness and color of the objects. We measured, in Experiment 1, the illuminance of a test room to equate the brightness appearance of the room with that of a standard room when the lightness of objects in the test room was made lower compared to that of the standard room, when all the objects of both rooms were made of grey surface. A higher illuminance was needed for the test room to get the equality implying that lower lightness produced a smaller RVSI in the subjects brain when both rooms were illuminated to a same illuminance. In Experiment 2, colored surfaces were employed for objects in the test room to investigate the effect of color as well as of its saturation upon the RVSI. Less illuminance was need to get the equality of brightness appearance of space when the color was used for the objects in the test room and still less illuminance was needed if more saturated color was used for the objects in the test room, while keeping the standard room grey. Colored objects produced a larger RVSI in the subjects brain than grey objects.