TU Darmstadt / ULB / TUbiblio

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

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

Kurzbeschreibung (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.

Typ des Eintrags: Masterarbeit
Erschienen: 2015
Autor(en): Tanksale, Tejas Madan
Titel: Development of a Spectral Acquisition System using a Tunable Light Source and a Trichromatic Camera
Sprache: Englisch
Kurzbeschreibung (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.

Ort: Darmstadt
Fachbereich(e)/-gebiet(e): Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen > Lichttechnik
Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen
Fachbereich Elektrotechnik und Informationstechnik
Hinterlegungsdatum: 03 Mai 2016 16:36
Gutachter / Prüfer: Khanh, Prof. Dr. Tran Quoc ; Urban, Dr. Philipp
Datum der Begutachtung bzw. der mündlichen Prüfung / Verteidigung / mdl. Prüfung: 2015
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