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Designing and evaluating an expert system for restoring damaged byzantine icons

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Abstract

The use of image processing techniques in cultural heritage applications has been gaining increasing interest in the research community. In this paper, an integrated framework that can be used for virtual restoration of the facial region of damaged Byzantine icons is presented. A key aspect of the proposed methodology is the integration of practices adopted by expert icon restorers into a machine-based expert system that incorporates the modules of damage detection, shape and texture restoration. Damage detection is performed based on a residual-based approach, while the shape restoration method utilizes a 3D shape model generated by incorporating a set of geometrical rules defined by expert Byzantine style iconographers. Texture restoration is based on the recursive Principal Component Analysis (PCA) technique so that combinations of colors learned from a training set are applied to the damaged icon regions. All modules, developed as part of this framework, are incorporated into a user-friendly application that can be used by amateurs or professional Byzantine icon restorers and conservators. The potential of the developed tool has been validated through a quantitative experimental process and a user-based evaluation.

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Acknowledgments

This work was supported by the Cyprus Research Promotion Foundation and the European Union Structural Funds (project ΤΠΕ/ΠΛΗΡΟ/0609(ΒΙΕ)/05). We would also like to thank the iconographers Dr. D. Demosthenous and Mr. C. Karis and the 3D modeler Mr. A. El Kater for their contribution.

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Correspondence to A. Maronidis.

Appendix A

Appendix A

Byzantine geometric rules

Table 5 Description of 23 utilized Byzantine geometric rules
Fig. 20
figure 20

Indicative 3D distances used for the implementation of discrepancy metrics. In the figure the distances d0, d1, d2, d3, d4, d5, d9, d10, d29, d30, d31, d40, d41, d42 and d43 are shown. Distances are derived based on the coordinates of the corresponding vertices

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Maronidis, A., Voutounos, C. & Lanitis, A. Designing and evaluating an expert system for restoring damaged byzantine icons. Multimed Tools Appl 74, 9747–9770 (2015). https://doi.org/10.1007/s11042-014-2149-1

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