Abstract
This study aims to conclusively establish a perfect method for evaluation of the visibility of a solid object. We wish to comprehend what are equivalent to the ultimate visibility of a solid object. It is assumed that the ultimate visibility of a solid object consists of three elemental aspects; “Brightness”, “Comprehensibility” and “Balance”. Furthermore, there are 12 focused items on each elemental aspect. In order to examine the effect of each elemental aspect on the ultimate visibility, a subjective evaluation experiment for the visibility of a solid object was carried out. It was found that the visibility aspect of “Brightness” did not directly lead to the ultimate visibility. However, the aspect of “Comprehensibility” of the outlines of a cube, the aspect of “Balance” of the brightness on surfaces of a cube, and the visibility aspect of “Balance” of light direction do lead to ultimate visibility.
