2つの照明認識視空間の相互作用

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One can immediately judge the state of illumination of a room by observing various objects in the room such as furniture and wall paper. The appearance of the objects, e.g., their color and brightness, constitutes the initial visual information about the room, and the recognized visual space of illumination, RVSI, of the room that the observer gains is based on that information. The observer's later judgment about the appearance of objects in the room is based on the RVSI. Here, we consider the interaction between RVSIs for two rooms connected by a window of variable size: one for an observer's room with Dlight type illumination and the other for a test room with Alight type illumination. The RVSI of the test room was evaluated by measuring the appearance of colors of nine test color charts placed in the test room as a function of the illuminance of the observer's room, which was varied between 0lx and 270lx, with the illuminance of the test room constant at 270lx; it was also measured as a function of the window size. The RVSI of the test room was not affected by the RVSI of the observer's room for the illuminance of 0lx through 1lx, but it was affected for illuminance above 1lx, and the effect increased for higher illuminance values. A greater effect was also found for smaller windows. The direction of color change of the color charts varied along the hue circle, depending on the hues. That phenomenon was explained using a chromaticity diagram.