| Lighting Model of the Real World in Augmented Reality |
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| 作者姓名： | 周雅 闫达远 赵虎 |
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| 作者单位： | [1]SchoolofInformationScienceandTechnology,BeijingInstituteofTechnology,Beijing100081,China [2]InstituteofRemoteSensingandGeographyInformationSystem,PekingUniversity,Beijing100871,China |
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| 摘 要： | Construction of a lighting model of the real world is one of the critical aims in an augmented reality (AR) system. The theory of lighting modeling used in computer graphics(CG) is applied in this study. The position of the real light-source is first conjectured from light and shade of the registration image element by element using a ray tracking algorithm. Then the virtual light-source and virtual fiducial are constructed in the CG environment, in which, the Phong model is used to draw the light effect. By comparing the CG scene with the real image, one can modify the parameters of the lighting model over and over again, until the lighting effect of the CG scene is close enough to that of the real image. It is proved that this method works well in the indoor AR system. The method can be used feasibly in most applications with some improvements.
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| 关 键 词： | 照明模型 配准 扩充实体 计算机制图 虚拟实体 |
| 收稿时间： | 2003/3/15 0:00:00 |
Lighting Model of the Real World in Augmented Reality |
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| ZHOU Y,YAN Da-yuan and ZHAO Hu.Lighting Model of the Real World in Augmented Reality[J].Journal of Beijing Institute of Technology,2004,13(2):165-168. |
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| Authors: | ZHOU Y YAN Da-yuan and ZHAO Hu |
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| Affiliation: | 1. School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2. Institute of Remote Sensing and Geography Information System, Peking University, Beijing 100871, China |
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| Abstract: | Construction of a lighting model of the real world is one of the critical aims in an augmented reality (AR) system. The theory of lighting modeling used in computer graphics(CG) is applied in this study. The position of the real light-source is first conjectured from light and shade of the registration image element by element using a ray tracking algorithm. Then the virtual light-source and virtual fiducial are constructed in the CG environment, in which, the Phong model is used to draw the light effect. By comparing the CG scene with the real image, one can modify the pareters of the lighting model over and over again, until the lighting effect of the CG scene is close enough to that of the real image. It is proved that this method works well in the indoor AR system. The method can be used feasibly in most applications with some improvements. |
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| Keywords: | augmented reality lighting model registration |
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