| Presentation | 2020-03-16 Joint Estimation of Illumination Distribution and Response Function from Shadows Takuto Nakashima, Ryo Matsuoka, Takahiro Okabe, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We estimate the illumination distribution of a scene from a single image. Conventional methods assume that the radiometric response function of a camera is linear or that the scene is convex and has no cast shadow. However, since the response function of a consumer camera is nonlinear, the conventional methods cannot be applied to images on the Internet. Furthermore, the high-frequency components of the illumination distribution cannot be estimated from the image of a convex Lambertian scene without cast shadows. Therefore, we jointly estimate the illumination distribution and radiometric response function based on cast shadows. Specifically, we use Haar wavelets for representing an illumination distribution and perform sparse optimization. Furthermore, we show that by applying a mask to the edge region, robust estimation from approximate shapes in the real image is possible. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Inverse lighting / cast shadows / radiometric response function / Haar wavelets |
| Paper # | PRMU2019-77 |
| Date of Issue | 2020-03-09 (PRMU) |
| Conference Information | |
| Committee | PRMU / IPSJ-CVIM |
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| Conference Date | 2020/3/16(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Yoichi Sato(Univ. of Tokyo) |
| Vice Chair | Toru Tamaki(Hiroshima Univ.) / Akisato Kimura(NTT) |
| Secretary | Toru Tamaki(NTT) / Akisato Kimura(OMRON SINICX) |
| Assistant | Yusuke Uchida(DeNA) / Takayoshi Yamashita(Chubu Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Pattern Recognition and Media Understanding / Special Interest Group on Computer Vision and Image Media |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Joint Estimation of Illumination Distribution and Response Function from Shadows |
| Sub Title (in English) | |
| Keyword(1) | Inverse lighting |
| Keyword(2) | cast shadows |
| Keyword(3) | radiometric response function |
| Keyword(4) | Haar wavelets |
| 1st Author's Name | Takuto Nakashima |
| 1st Author's Affiliation | Kyushu Institute of Technology(Kyutech) |
| 2nd Author's Name | Ryo Matsuoka |
| 2nd Author's Affiliation | Kyushu Institute of Technology(Kyutech) |
| 3rd Author's Name | Takahiro Okabe |
| 3rd Author's Affiliation | Kyushu Institute of Technology(Kyutech) |
| Date | 2020-03-16 |
| Paper # | PRMU2019-77 |
| Volume (vol) | vol.119 |
| Number (no) | PRMU-481 |
| Page | pp.pp.65-70(PRMU), |
| #Pages | 6 |
| Date of Issue | 2020-03-09 (PRMU) |