Development and Calibration of a Gonio-Spectral Imaging System for Measuring Surface Reflection

Akira KIMACHI; Norihiro TANAKA; Shoji TOMINAGA

doi:10.1093/ietisy/e89-d.7.1994

Development and Calibration of a Gonio-Spectral Imaging System for Measuring Surface Reflection

Akira KIMACHI, Norihiro TANAKA, Shoji TOMINAGA

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This paper proposes a gonio-spectral imaging system for measuring light reflection on an object surface by using two robot arms, a multi-band lighting system, and a monochrome digital camera. It allows four degrees of freedom in incident and viewing angles necessary for full parametrization of a reflection model function. Spectral images captured for various incident and viewing angles are warped as if they were all captured from the same viewing direction. The intensity of reflected light is thus recorded in a normalized image form for any incident and viewing directions. The normalized images are used to estimate reflection model parameters at each surface point. To ensure point-wise reflection modeling, a calibration method is also proposed based on a geometrical model of the robot arms and camera. The proposed system can deal with objects with surface texture. Experiments are done on system calibration, reflection model, and spectral estimation. The results using colored objects show the feasibility of the proposed imaging system.

Publication: IEICE TRANSACTIONS on Information Vol.E89-D No.7 pp.1994-2003

Publication Date: 2006/07/01

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Online ISSN: 1745-1361

DOI: 10.1093/ietisy/e89-d.7.1994

Type of Manuscript: Special Section PAPER (Special Section on Machine Vision Applications)

Category: Photometric Analysis

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Akira KIMACHI, Norihiro TANAKA, Shoji TOMINAGA, "Development and Calibration of a Gonio-Spectral Imaging System for Measuring Surface Reflection" in IEICE TRANSACTIONS on Information, vol. E89-D, no. 7, pp. 1994-2003, July 2006, doi: 10.1093/ietisy/e89-d.7.1994.
Abstract: This paper proposes a gonio-spectral imaging system for measuring light reflection on an object surface by using two robot arms, a multi-band lighting system, and a monochrome digital camera. It allows four degrees of freedom in incident and viewing angles necessary for full parametrization of a reflection model function. Spectral images captured for various incident and viewing angles are warped as if they were all captured from the same viewing direction. The intensity of reflected light is thus recorded in a normalized image form for any incident and viewing directions. The normalized images are used to estimate reflection model parameters at each surface point. To ensure point-wise reflection modeling, a calibration method is also proposed based on a geometrical model of the robot arms and camera. The proposed system can deal with objects with surface texture. Experiments are done on system calibration, reflection model, and spectral estimation. The results using colored objects show the feasibility of the proposed imaging system.
URL: https://globals.ieice.org/en_transactions/information/10.1093/ietisy/e89-d.7.1994/_p

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@ARTICLE{e89-d_7_1994,
author={Akira KIMACHI, Norihiro TANAKA, Shoji TOMINAGA, },
journal={IEICE TRANSACTIONS on Information},
title={Development and Calibration of a Gonio-Spectral Imaging System for Measuring Surface Reflection},
year={2006},
volume={E89-D},
number={7},
pages={1994-2003},
abstract={This paper proposes a gonio-spectral imaging system for measuring light reflection on an object surface by using two robot arms, a multi-band lighting system, and a monochrome digital camera. It allows four degrees of freedom in incident and viewing angles necessary for full parametrization of a reflection model function. Spectral images captured for various incident and viewing angles are warped as if they were all captured from the same viewing direction. The intensity of reflected light is thus recorded in a normalized image form for any incident and viewing directions. The normalized images are used to estimate reflection model parameters at each surface point. To ensure point-wise reflection modeling, a calibration method is also proposed based on a geometrical model of the robot arms and camera. The proposed system can deal with objects with surface texture. Experiments are done on system calibration, reflection model, and spectral estimation. The results using colored objects show the feasibility of the proposed imaging system.},
keywords={},
doi={10.1093/ietisy/e89-d.7.1994},
ISSN={1745-1361},
month={July},}

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TY - JOUR
TI - Development and Calibration of a Gonio-Spectral Imaging System for Measuring Surface Reflection
T2 - IEICE TRANSACTIONS on Information
SP - 1994
EP - 2003
AU - Akira KIMACHI
AU - Norihiro TANAKA
AU - Shoji TOMINAGA
PY - 2006
DO - 10.1093/ietisy/e89-d.7.1994
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E89-D
IS - 7
JA - IEICE TRANSACTIONS on Information
Y1 - July 2006
AB - This paper proposes a gonio-spectral imaging system for measuring light reflection on an object surface by using two robot arms, a multi-band lighting system, and a monochrome digital camera. It allows four degrees of freedom in incident and viewing angles necessary for full parametrization of a reflection model function. Spectral images captured for various incident and viewing angles are warped as if they were all captured from the same viewing direction. The intensity of reflected light is thus recorded in a normalized image form for any incident and viewing directions. The normalized images are used to estimate reflection model parameters at each surface point. To ensure point-wise reflection modeling, a calibration method is also proposed based on a geometrical model of the robot arms and camera. The proposed system can deal with objects with surface texture. Experiments are done on system calibration, reflection model, and spectral estimation. The results using colored objects show the feasibility of the proposed imaging system.
ER -