Digital Image Processing Techniques for Evaluating Façade Flatness in Historical Buildings
Publication: Journal of Architectural Engineering
Volume 25, Issue 2
Abstract
This study reports a rapid method of analysis for evaluating the flatness of the façades of historical buildings. This method applies topographic, digital photogrammetric, and image processing techniques to measurements acquired by a semimetric camera in order to provide a planar metrified and rectified image. The use of this technique allows for the virtual control of alterations of a building’s geometrical and physical surface characteristics that have been induced by environmental decay and have possibly resulted in some deviation from flatness. We used the semimetric cameras Rolleiflex 3003 and Rolleiflex 6006 and a two-dimensional (2D) algorithm to verify the flatness of the main façade of a monument, the Zisa Palace in Palermo (Italy). The results of this study, which highlighted some deviations in the left edge of the façade with respect to the points of support, were obtained with an estimated 10−3 accuracy. Accurate statistical analysis applied to the measurements showed that the façade of this historical building is not a flat surface, suggesting that decay processes have occurred. Hence, this method can be used to easily demonstrate nonflatness of a façade of a historical building and to highlight structural failures in areas of the façade.
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Acknowledgments
I am grateful to Prof. Vincenzo Franco (Faculty of Engineering of the University of Palermo, Italy) for his kind help in carrying out the measurements with the semimetric cameras, Rolleiflex 3003 and Rolleiflex 6006, and for the permission to use the MR2 and MSR software packages.
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Published In
Journal of Architectural Engineering
Volume 25 • Issue 2 • June 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Dec 18, 2017
Accepted: Nov 15, 2018
Published online: Feb 27, 2019
Published in print: Jun 1, 2019
Discussion open until: Jul 27, 2019
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