Generating perceptually-correct shadows for mixed reality

Even though shadows are important for photometric consistency in Mixed Reality (MR) [1]. When human cannot perceive the inconsistency of artificial shadows which are not physically correct, they are acceptable as “perceptually-correct” shadows. This paper focuses on the simplification of light source models for generating the perceptually-correct artificial shadows. First, we conducted subjective evaluations to obtain knowledge about the human perception of the shadows. Then the knowledge was applied to control the resolution of the light source map to generate perceptually-correct artificial shadows. Comparative studies among artificial and real shadows justified perceptually correctness. All experiments were done using still images, not videos. Our research becomes a reference to determine the resolution of light source map in an MR scene. CR Categories and Subject Descriptors: [I.3.7] ThreeDimensional Graphics and Realism

• Type: Conference
• Year: 2008
• Where: ISMAR
• Authors: Gaku Nakano, Itaru Kitahara, Yuichi Ohta
• Keywords: Artificial Shadows, Augmented Reality, ISMAR 2008, Light Source, Perceptually-correct Artificial Shadows