不均一な輝度分布をもつ灯火の明るさ知覚

抄録

The brightness perception of a light with non-uniform luminance distribution is not clearly understood, especially at suprathreshold levels. Two experiments were done to clalify this mode of brightness perception. In the first experiment, subjects made brightness matches between a test stimulus with non-uniform luminance distribution and a matching stimulus with uniform luminance distribution. Matches were made as function of background luminance. In the second experiment, brightness matches were made between a multiple-point stimulus and a one-point stimulus as a function of the point and separation.
With respect to the variables of stimulus size and background luminance, the results show that the brightness perception of the non-uniform stimulus and the multiple point stimulus is similar to that of the uniform stimulus. The brightness of the non-uniform stimulus may be obtained with an element-contribution function derived from circular stimuli with uniform luminance distribution. The brightness of the multiple-point stimulus also agrees with the from the elementcontribution model at a background luminance of 0 cd/m², but does not agree at a background luminance of 10 cd/m².