Colorimetric characterization of digital cameras with unrestricted capture settings applicable for different illumination circumstances

With colorimetric characterization, digital cameras can be used as image-based tristimulus colorimeters for color communication. In order to overcome the restriction of fixed capture settings adopted in the conventional colorimetric characterization procedures, a novel method was proposed considerin...

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Bibliographic Details
Published in:Journal of modern optics 2016-05, Vol.63 (9), p.847-860
Main Authors: Fang, Jingyu, Xu, Haisong, Wang, Zhehong, Wu, Xiaomin
Format: Article
Language:English
Subjects:
camera characterization
capture settings
Color temperature
Colorimetry
Construction
correlated color temperatures (CCTs)
Digital cameras
Error analysis
Errors
Illumination
illumination levels
image-based tristimulus colorimeter
Mathematical models
Optics
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Summary:With colorimetric characterization, digital cameras can be used as image-based tristimulus colorimeters for color communication. In order to overcome the restriction of fixed capture settings adopted in the conventional colorimetric characterization procedures, a novel method was proposed considering capture settings. The method calculating colorimetric value of the measured image contains five main steps, including conversion from RGB values to equivalent ones of training settings through factors based on imaging system model so as to build the bridge between different settings, scaling factors involved in preparation steps for transformation mapping to avoid errors resulted from nonlinearity of polynomial mapping for different ranges of illumination levels. The experiment results indicate that the prediction error of the proposed method, which was measured by CIELAB color difference formula, reaches less than 2 CIELAB units under different illumination levels and different correlated color temperatures. This prediction accuracy for different capture settings remains the same level as the conventional method for particular lighting condition.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2015.1107647