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Sensors 2017, 17(11), 2437;

Securing Color Fidelity in 3D Architectural Heritage Scenarios

Department of Architecture, University of Bologna, Bologna 40136, Italy
3D Optical Metrology (3DOM) Unit, Bruno Kessler Foundation (FBK), Trento 38123, Italy
Author to whom correspondence should be addressed.
Received: 28 August 2017 / Revised: 7 October 2017 / Accepted: 22 October 2017 / Published: 25 October 2017
(This article belongs to the Section Remote Sensors)
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Ensuring color fidelity in image-based 3D modeling of heritage scenarios is nowadays still an open research matter. Image colors are important during the data processing as they affect algorithm outcomes, therefore their correct treatment, reduction and enhancement is fundamental. In this contribution, we present an automated solution developed to improve the radiometric quality of an image datasets and the performances of two main steps of the photogrammetric pipeline (camera orientation and dense image matching). The suggested solution aims to achieve a robust automatic color balance and exposure equalization, stability of the RGB-to-gray image conversion and faithful color appearance of a digitized artifact. The innovative aspects of the article are: complete automation, better color target detection, a MATLAB implementation of the ACR scripts created by Fraser and the use of a specific weighted polynomial regression. A series of tests are presented to demonstrate the efficiency of the developed methodology and to evaluate color accuracy (‘color characterization’). View Full-Text
Keywords: color acquisition; color balance; photogrammetry; automation; color management; structure for motion; photometric calibration color acquisition; color balance; photogrammetry; automation; color management; structure for motion; photometric calibration

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Gaiani, M.; Apollonio, F.I.; Ballabeni, A.; Remondino, F. Securing Color Fidelity in 3D Architectural Heritage Scenarios. Sensors 2017, 17, 2437.

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