| Presentation | 2012/1/12 Position Estimation of Near Light Sources Using Specular Reflection on Clear Hollow Sphere TAKAHITO AOTO, TAKAFUMI TAKETOMI, TOMOKAZU SATO, NAOKAZU YOKOYA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Position estimation of near light sources is one of the important problems for 3D shape estimation by photometric stereo. In this paper, we propose a novel method for estimating position of near light sources by using reflected positions of light sources on a clear hollow sphere. Conventionally, this problem has been solved by using observed reflected lights on multiple reference objects or self-shadows of a single reference object of known 3D shape. However, the former approach requires geometric calibrate of reference objects, and the latter approach has a problem for estimating light positions stably due to many unknown parameters. In order to solve these problems, we propose a method for estimating positions of near light sources by using reflected positions of the two kinds, outside and inside, specular lights on a single clear hollow sphere. This method has the following features; (1) geometric calibration for multiple reference objects is not required. (2) positions of corresponding reflections are observed on an epipolar line and thus it easy to find corresponding pair of reflected positions. (3) position of near light sources can be accurately and stably estimated by minimizing re-projection errors. In experiments, we demonstrate the effectiveness of our method showing the accuracy of light positions estimation, using simulation and real image data. |
| Keyword(in Japanese) | (See Japanese page) |
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| Paper # | Vol.2012-CVIM-180 No.11 |
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| Committee | MVE |
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| Conference Date | 2012/1/12(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Media Experience and Virtual Environment (MVE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Position Estimation of Near Light Sources Using Specular Reflection on Clear Hollow Sphere |
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| 1st Author's Name | TAKAHITO AOTO |
| 1st Author's Affiliation | Nara Institute of Science and Technology() |
| 2nd Author's Name | TAKAFUMI TAKETOMI |
| 2nd Author's Affiliation | Nara Institute of Science and Technology |
| 3rd Author's Name | TOMOKAZU SATO |
| 3rd Author's Affiliation | Nara Institute of Science and Technology |
| 4th Author's Name | NAOKAZU YOKOYA |
| 4th Author's Affiliation | Nara Institute of Science and Technology |
| Date | 2012/1/12 |
| Paper # | Vol.2012-CVIM-180 No.11 |
| Volume (vol) | vol.111 |
| Number (no) | 380 |
| Page | pp.pp.- |
| #Pages | 8 |
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