Ichihara Shigeru, Kitagawa Norimichi, Akutsu Hiromi
Department of Psychology, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
Perception. 2007;36(5):686-95. doi: 10.1068/p5696.
Many objects in natural scenes have textures on their surfaces. Contrast of the texture surfaces (the texture contrast) reduces when the viewing distance increases. Similarly, contrast between the surfaces of the objects and the background (the area contrast) reduces when the viewing distance increases. The texture contrast and the area contrast were defined by the contrast between random dots, and by the contrast between the average luminance of the dot pattern and the luminance of the background, respectively. To examine how these two types of contrast influence depth perception, we ran two experiments. In both experiments two areas of random-dot patterns were presented against a uniform background, and participants rated relative depth between the two areas. We found that the rated depth of the patterned areas increased with increases in texture contrast. Furthermore, the effect of the texture contrast on depth judgment increased when the area contrast became low.
自然场景中的许多物体表面都有纹理。当观察距离增加时，纹理表面的对比度（纹理对比度）会降低。同样，当观察距离增加时，物体表面与背景之间的对比度（区域对比度）也会降低。纹理对比度和区域对比度分别由随机点之间的对比度以及点图案的平均亮度与背景亮度之间的对比度定义。为了研究这两种对比度如何影响深度感知，我们进行了两个实验。在两个实验中，均在均匀背景下呈现两个随机点图案区域，参与者对这两个区域之间的相对深度进行评分。我们发现，图案区域的评分深度随着纹理对比度的增加而增加。此外，当区域对比度变低时，纹理对比度对深度判断的影响会增强。
