Generating perceptually-correct shadows for mixed reality

• Published in: 2008 7th IEEE International Symposium on Mixed and Augmented Reality pp. 173 - 174
• Main Authors: Nakano, G., Kitahara, I., Ohta, Y.
• Format: Conference Proceeding
• Language: English; Japanese
• Published: Washington, DC, USA IEEE Computer Society 01.09.2008; IEEE
• Series: ACM Other Conferences
• Subjects: [I.3.7] Three-Dimensional Graphics and Realism; Applied computing > Document management and text processing > Document capture > Graphics recognition and interpretation; Augmented reality; Computing methodologies > Artificial intelligence > Computer vision; Computing methodologies > Artificial intelligence > Computer vision > Computer vision tasks > Scene understanding; Computing methodologies > Artificial intelligence > Computer vision > Image and video acquisition > 3D imaging; Computing methodologies > Computer graphics; Computing methodologies > Computer graphics > Animation; Computing methodologies > Computer graphics > Graphics systems and interfaces > Virtual reality; Distance measurement; Fluorescence; Human-centered computing > Human computer interaction (HCI) > Interaction paradigms > Mixed > augmented reality; Human-centered computing > Human computer interaction (HCI) > Interaction paradigms > Virtual reality; Image Based Lighting; Image generation; Image resolution; Lighting; Photometric Consistency; Soft Shadow; Subjective Evaluation Experiment; Virtual reality
• ISBN: 9781424428403; 1424428408
• DOI: 10.1109/ISMAR.2008.4637352

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.