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Proceedings Paper

Perceptually grounded color evaluation in virtual aided recomposition of fragmented frescos
Author(s): Floriana Renna; Lea Venturino; Giovanni Attolico; Arcangelo Distante
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Paper Abstract

The paper deals with a problem arisen in developing a system for the aided virtual recomposition of fragmented frescos (in particular the S. Mathew's fresco of the S. Francis Upper Church in Assisi). The goal is to expand the capabilities of the operators which remains responsible of the whole process. A core functionality is the automatic evaluation of similarity between images of fragments in a consistent way with evaluations made by humans using their visual perception: a critical property for working in tight cooperation with the operators. This requires a color representation close to human color matching. S-CIELAB, a spatial extension of the CIELAB color representation, is a space whose metrics closely reproduces, through the Euclidean norm, the color distances perceived by a human observer and accounts for the effects of the spatial distribution of colors. S-CIELAB extends CIELAB by incorporating factors related to the pattern-color sensitivity of the human eye. The system ascribes to the fragment pattern-color characteristics according to the visual perception the human operator has of the fragment; the use of automatic tools for color evaluation avoids the inconsistent results due to different operators and to fatigue of the same person over time.

Paper Details

Date Published: 19 March 2003
PDF: 9 pages
Proc. SPIE 4877, Opto-Ireland 2002: Optical Metrology, Imaging, and Machine Vision, (19 March 2003); doi: 10.1117/12.464353
Show Author Affiliations
Floriana Renna, CNR-ISSIA (Italy)
Lea Venturino, CNR-ISSIA (Italy)
Giovanni Attolico, CNR-ISSIA (Italy)
Arcangelo Distante, CNR-ISSIA (Italy)

Published in SPIE Proceedings Vol. 4877:
Opto-Ireland 2002: Optical Metrology, Imaging, and Machine Vision
Andrew Shearer; Fionn D. Murtagh; James Mahon; Paul F. Whelan, Editor(s)

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