Prof. Guido Maria Cortelazzo Profile

Prof. Guido Maria Cortelazzo

Associate Professor at Univ degli Studi di Padova

SPIE Involvement:

Author

Proceedings Article | 6 June 2011 Paper

New trends in imaging spectroscopy: the non-invasive study of the Scrovegni Chapel stained glass windows

E. Rebollo, F. Ratti, G. Cortelazzo, L. Poletto, R. Bertoncello

Proceedings Volume 8084, 808407 (2011) https://doi.org/10.1117/12.888839

KEYWORDS: Glasses, Chromophores, Lamps, Absorption, Imaging spectroscopy, Spectrographs, Transmittance, Signal to noise ratio, Visible radiation, Crown glass

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Imaging spectroscopy (IS) extends the measurement of one-dimensional UV-VIS-NIR spectroscopy to two-dimensional domain providing material characterization and localization. The technique is gaining importance for the study of cultural heritage but its application is mainly focused on the analysis of pigments in paintings. An IS device has been developed and then applied to the study of chromophores in glassy objects. It consists of a visible imaging spectrograph, mounted on a rotation stage, which captures monochromatic images of the sample within a wavelength range from 420 nm to 850 nm. The system has been used for the characterization and mapping of chromophores of hundreds of coloured glass tesserae of the stained glass windows from the Scrovegni Chapel (Padua, Italy). Two measurement methodologies have been performed: transmission and double-transmission modes. In the first case, lamps used to illuminate the sample and the spectrograph are placed on the opposite side of the window, to acquire directly the signal transmitted from the glass. In the latter case, the lamps and the spectrograph are placed on the same side of the window, that is placed on a white scattering screen. The acquired signal comes from the light of the lamps transmitted through the glass, then diffused back by the opaque white screen and finally transmitted again through the glass. Results are discussed comparing both modalities in terms of signal-to-noise ratio and spectral contrast. Visible spectra acquired allow the clear identification of several chromophores, e.g. Co(II), Cr(III) or Mn(III). The IS device acquires numerous spectra in relatively short time in a non-invasive way. According to the authors knowledge, this is the first time in which visible imaging spectroscopy technique has been applied for the study of stained glass windows. As the results show, it could represent a powerful and innovative tool to map chromophores of this kind of artefact, particularly when integrated with other non-invasive techniques as X-ray fluorescence.

Proceedings Article | 19 January 2009 Paper

Estimating angle-dependent systematic error and measurement uncertainty for a conoscopic holography measurement system

Anna Paviotti, Simone Carmignato, Alessandro Voltan, Nicola Laurenti, Guido Cortelazzo

Proceedings Volume 7239, 72390Z (2009) https://doi.org/10.1117/12.805972

KEYWORDS: Optical spheres, Error analysis, Holography, Sensors, 3D metrology, Optical sensors, Optical testing, 3D image processing, Video, Calibration

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Proceedings Article | 23 July 2007 Paper

Simultaneous acquisition of 3D shape and color texture from large frescoed areas

M. Caldon, M. Fedel, L. Poletto, N. Brusco, G. Cortelazzo, A. Paviotti

Proceedings Volume 6618, 66180J (2007) https://doi.org/10.1117/12.725869

KEYWORDS: Spectrographs, 3D modeling, 3D acquisition, Laser scanners, Calibration, Distance measurement, 3D scanning, Reflectivity, Lithium, Lamps

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Proceedings Article | 12 August 2005 Paper

An integrated system for measurement of 3-D shape and color texture of artistic and architectural cultural assets

S. Capeleto, M. De Boni, M. Fedel, F. Mario, L. Poletto, G. Tondello, N. Brusco, G. Cortelazzo

Proceedings Volume 5857, 58570C (2005) https://doi.org/10.1117/12.613062

KEYWORDS: Spectrographs, Laser scanners, 3D vision, Imaging systems, Calibration, 3D scanning, 3D modeling, System integration, 3D metrology, Sensors

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Proceedings Article | 29 October 1993 Paper

Subband coding of museal images

Marco Ardito, Guido Cortelazzo, M. Martelli, Gian Mian

Proceedings Volume 1977, (1993) https://doi.org/10.1117/12.160480

KEYWORDS: Televisions, Cameras, Image compression, Optical filters, Signal attenuation, Visualization, Image quality, Image filtering, Data compression, Data storage

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Proceedings Article | 1 November 1991 Paper

Extension of Rader's algorithm for high-speed multidimensional autocorrelation

R. Rinaldo, Riccardo Bernardini, Guido Cortelazzo

Proceedings Volume 1606, (1991) https://doi.org/10.1117/12.50336

KEYWORDS: Image processing, Visual communications, Direct methods, Signal processing, Transform theory, Multidimensional signal processing, Optical filters, Electronic filtering, Finite impulse response filters, 3D image processing

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Proceedings Article | 1 November 1990 Paper

Open architecture for multispectral computer vision applied to both visual and infrared bands

Paolo Bison, Alberto Braggiotti, Guido Cortelazzo, Ermanno Grinzato, Andrea Mazzoldi, Gian Mian

Proceedings Volume 1349, (1990) https://doi.org/10.1117/12.23544

KEYWORDS: Machine vision, Visualization, Infrared radiation, Computer architecture, Digital image processing, Operating systems, Computer vision technology, Information fusion, Information visualization, Data acquisition

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Proceedings Article | 1 March 1990 Paper

Automatic thermal reference detection in thermographic images

Paolo Bison, Guido Cortelazzo, Ermanno Grinzato, Piergiorgio Svaizer

Proceedings Volume 1313, (1990) https://doi.org/10.1117/12.21946

KEYWORDS: Temperature metrology, Edge detection, Infrared imaging, Hough transforms, Image processing, Sensors, Image enhancement, Thermal modeling, Thermography, Infrared radiation

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Showing 5 of 8 publications

Conference Committee Involvement (1)

Computer Image Analysis in the Study of Art

28 January 2008 | San Jose, California, United States

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