Assessment of real aging in selection process of replacement materials for stone monuments conservation.

Nicolas Concha Lozano; Dominique Lafon; Olivier Eterradossi; Pierre Gaudon

doi:10.4995/var.2011.4579

Authors

Nicolas Concha Lozano Ecole des Mines d’Alès
Dominique Lafon Ecole des Mines d’Alès
Olivier Eterradossi Ecole des Mines d’Alès
Pierre Gaudon Ecole des Mines d’Alès

DOI:

https://doi.org/10.4995/var.2011.4579

Keywords:

Compatibility, Stone, Calibration, Colour, Cultural heritage

Abstract

Reconstruction of monuments often raises the question of stones replacement. It must be aesthetically durable, which means the stone must age like the original one. This study presents an image processing chain, from capture to visualisation, to compare stones at different states of aging: recently extracted from quarry, weathered on old buildings, and cleaned on monuments recently restored. This tool includes: (1) a digital still camera calibration, (2) a chromatic adaptation transform and (3) a resizing process. To test it, a case study was conducted to assess the compatibility of three types of limestone. This graphical tool helps the selection of replacement materials by visual comparison between several possible stones in order to select them by aging properties and visual resemblance.

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Author Biographies

Nicolas Concha Lozano, Ecole des Mines d’Alès

Centre des Matériaux de Grande Diffusion (CMGD). Ecole des Mines d’Alès, Alès, France

Dominique Lafon, Ecole des Mines d’Alès

Lab. Propriétés Psycho-Sensorielles des Matériaux (2PSM). Ecole des Mines d’Alès, Pau, France

Olivier Eterradossi, Ecole des Mines d’Alès

Lab. Propriétés Psycho-Sensorielles des Matériaux (2PSM). Ecole des Mines d’Alès, Pau, France

Pierre Gaudon, Ecole des Mines d’Alès

Centre des Matériaux de Grande Diffusion (CMGD). Ecole des Mines d’Alès, Alès, France

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