Koizumi Tomomi, Ito Hiroyuki, Sunaga Shoji, Ogawa Masaki
Graduate School of Design, Kyushu University, Fukuoka, Japan.
Faculty of Design, Kyushu University, Fukuoka, Japan; Research Center for Applied Perceptual Science, Kyushu University, Fukuoka, Japan.
Iperception. 2017 Jan 1;8(1):2041669516682267. doi: 10.1177/2041669516682267. eCollection 2017 Jan-Feb.
Previous studies have demonstrated that the perception of shading is based upon assumptions about lighting direction, for example, light from above. However, it is not clear whether these assumptions are used in the perception of cast shadows. Moreover, it is unclear whether a perceptual interaction exists between shading and cast shadows because until now they have been studied separately. In this study, we investigated through three experiments whether the light-from-above (or another direction) assumption is used in interpreting ambiguous cast shadows, and whether shading information influences the interpretation of cast shadows. Our results indicate the existence of the light-from-above assumption in interpreting cast shadows. Consistent shading information enhanced the interpretation, and judgments of lighting direction were also based on both cast shadow and shading information. However, the perceptual determination of shape from shading was relatively independent of the cast shadow interpretation or the lighting direction judgments of the scene.
先前的研究表明，对阴影的感知基于关于光照方向的假设，例如来自上方的光。然而，尚不清楚这些假设是否用于投射阴影的感知。此外，尚不清楚在阴影和投射阴影之间是否存在感知交互作用，因为到目前为止它们一直是分开研究的。在本研究中，我们通过三个实验调查了在解释模糊的投射阴影时是否使用了来自上方（或其他方向）的光假设，以及阴影信息是否会影响投射阴影的解释。我们的结果表明在解释投射阴影时存在来自上方的光假设。一致的阴影信息增强了这种解释，并且光照方向的判断也基于投射阴影和阴影信息。然而，从阴影中感知形状相对独立于投射阴影的解释或场景的光照方向判断。
