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Morphology-Based Automated Baseline Removal for Raman Spectra of Artistic Pigments

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Abstract:

The interpretation of a Raman spectrum is based on the identification of its characteristic molecular bands. However, the assignment of the vibrational modes is often compromised by the presence in the spectrum of an intense fluorescence background that covers the measured spectra. Several techniques have been employed to minimize the presence of this fluorescence in order to resolve and analyze Raman spectra. In this paper a new automated method for fluorescence subtraction is described, based on morphology operations. This method is compared with the most commonly used polynomial fitting methods. Results indicate that the proposed automated method is efficient in fluorescence subtraction and retains the line shapes and positions of the Raman bands in the spectra.

Keywords: ART CONSERVATION; BACKGROUND SUBTRACTION; FLUORESCENCE; MATHEMATICAL MORPHOLOGY; PIGMENT IDENTIFICATION; RAMAN SPECTROSCOPY; SPECTRAL PROCESSING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210791414281

Affiliations: Signal Theory and Communications Department, ETSETB, Universitat Polit├Ęcnica de Catalunya, C/ Sor Eulalia de Anzizu s/n, D5, Campus Nord, 08034 Barcelona, Spain

Publication date: June 1, 2010

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