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Development of a Spectral Acquisition System using a Tunable Light Source and a Trichromatic Camera

Tanksale, Tejas Madan (2015):
Development of a Spectral Acquisition System using a Tunable Light Source and a Trichromatic Camera.
Darmstadt, TU Darmstadt, Fachgebiet Lichttechnik, [Master Thesis]

Abstract

Colours perceived by humans are influenced by a large number of factors. The same object may look different under different lighting conditions. This is also true for images captured by a camera sensor. In addition to this, each measuring device has its own capturing properties. For example, the RGB intensities captured by different cameras are different for the same object in the same lighting conditions. To avoid these variations in the observed colour, it is necessary to know the ground truth of the colour data of the object, which is given by its spectral reflectance. In this thesis, we devise a method for estimating the spectral reflectances at a fast speed using a tunable monochromatic light source and a trichromatic camera. The estimation is a two-step process: first we need to determine the camera sensitivities, secondly, we use the estimated sensitivities to calculate the reflectances. For both experiments we use the same setup which allows us to use software application programming interfaces (APIs) to obtain reflectances for a large number of targets at an extreme speed and accuracy. For the evaluation ofour method, we employ a spectroradiometer which can directly measure the spectra of the targets.

Item Type: Master Thesis
Erschienen: 2015
Creators: Tanksale, Tejas Madan
Title: Development of a Spectral Acquisition System using a Tunable Light Source and a Trichromatic Camera
Language: English
Abstract:

Colours perceived by humans are influenced by a large number of factors. The same object may look different under different lighting conditions. This is also true for images captured by a camera sensor. In addition to this, each measuring device has its own capturing properties. For example, the RGB intensities captured by different cameras are different for the same object in the same lighting conditions. To avoid these variations in the observed colour, it is necessary to know the ground truth of the colour data of the object, which is given by its spectral reflectance. In this thesis, we devise a method for estimating the spectral reflectances at a fast speed using a tunable monochromatic light source and a trichromatic camera. The estimation is a two-step process: first we need to determine the camera sensitivities, secondly, we use the estimated sensitivities to calculate the reflectances. For both experiments we use the same setup which allows us to use software application programming interfaces (APIs) to obtain reflectances for a large number of targets at an extreme speed and accuracy. For the evaluation ofour method, we employ a spectroradiometer which can directly measure the spectra of the targets.

Place of Publication: Darmstadt
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Light Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology
Date Deposited: 03 May 2016 16:36
Referees: Khanh, Prof. Dr. Tran Quoc and Urban, Dr. Philipp
Refereed / Verteidigung / mdl. Prüfung: 2015
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