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(21 articles) Nicolaus Copernicus University
(8 articles) University of Kent
(8 articles) Pierre & Marie Curie University
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They go through the pictures without touching them! (A Swiss Television Video on OCT in Art)
Explore Article Nouvelles tendances & technologies (Jul 5 2010)
Text translation of the web page can be obtained using Google Language Tools. A new technique useful in the restoration attracting interest from major museums. Using a method derived from ophthalmology, researchers are able to get inside even works of art! Its name: optical coherence tomography. In the restoration workshops of the Museum of Art and History in Geneva, a romantic landscape painter undergoes a battery of tests. Fluorescence ultraviolet light to diagnose the condition of the varnish, and then exposed to a raking light to explore the contours of the material, Victor Lopes, the conservator of places, has ten ...
Comment on Article Mentions: Pierre & Marie Curie University Mady Elias Gaël Latour
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Contribution of surface state characterization to studies of works of art
Explore Article opticsinfobase.org (Apr 6 2010)
This paper has two purposes. The first one underlines that qualitative and quantitative studies of surface states lead to relevant information for analyzing works of art, with lots of potential for art history, restorers, and curators. The discrimination between different artistic techniques and the influence of a varnish on the leveling of paint surfaces are presented. The second purpose is the comparison between different nondestructive optical topographic methods, i.e., goniophotometry, optical coherence topography, and confocal microscopy, according to their accuracy, their discriminatory ability, their practicability inside a museum, and the size limits of the studied objects.
Comment on Article Mentions: Pierre & Marie Curie University Mady Elias
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Two New Methods Lend Scientific Muscle To Detecting Art Forgeries
Explore Article io9. We come from the future. (Feb 10 2010)
If you're looking to sell some phony art, your time appears to be running out. Dartmouth researchers can spot art forgeries using neuroscience techniques, while Polish scientists use medical imaging technology to do likewise. The Dartmouth College team of James Hughes, Daniel Graham, and Daniel Rockmore took an established part of neuroscience - the notion of sparse coding - and applied it to the art world. Sparse coding technology imitates the human visual system by attempting to replicate the ways in which the brain takes complex images and breaks them down into simple patterns thanks to a series of filter ...
Comment on Article Mentions: Nicolaus Copernicus University Piotr Targowski
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Imaging method for eye disease used to eye art forgeries
Explore Article PhysOrg.com (Feb 3 2010)
Scientists in Poland are describing how a medical imaging technique has taken on a second life in revealing forgery of an artist's signature and changes in inscriptions on paintings that are hundreds of years old. A report on the technique, called optical coherence tomography (OCT), is in ACS' Accounts of Chemical Research. Piotr Targowski notes that easel paintings prepared according to traditional techniques consist of multiple layers. The artist, for instance, first applies a glue sizing over the canvas to ensure proper adhesion of later layers. Those layers may include an outline of the painting, the painting itself, layers of ...
Comment on Article Mentions: Nicolaus Copernicus University Piotr Targowski
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Structural Examination of Easel Paintings with Optical Coherence Tomography
Explore Article ACS Publications Home Page (Dec 31 2009)
Identification of the order, thickness, composition, and possibly the origin of the paint layers forming the structure of a painting, that is, its stratigraphy, is important in confirming its attribution and history as well as planning conservation treatments. The most common method of examination is analysis of a sample collected from the art object, both visually with a microscope and instrumentally through a variety of sophisticated, modern analytical tools. Because of its invasiveness, however, sampling is less than ideally compatible with conservation ethics; it is severely restricted with respect to the amount of material extirpated from the artwork. Sampling is ...
Comment on Article Mentions: Nicolaus Copernicus University Piotr Targowski
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Speckle noise reduction in optical coherence tomography of paint layers
Explore Article opticsinfobase.org (Dec 21 2009)
We present and characterize a sequential angular compounding method for reducing speckle contrast in optical coherence tomography images of paint layers. The results are compared with postprocessing methods, and we show that the compounding technique can improve the speckle contrast ratio in B-scans by better than a factor of 2 in exchange for a negligible loss of resolution. As a result, image aesthetics are improved, thin layers become more distinct, and edge-detection algorithms work more efficiently. The effect of varying the angular scan size and number of averages is investigated, and it is found that a degree of statistical correlation ...Comment on Article Mentions: Adrian G. Podoleanu University of Kent
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The Nature of the Extraordinary Finish of Stradivaris Instruments
Explore Article www3.interscience.wiley.com (Dec 13 2009)
The composition of Stradivari\9s varnish has raised numerous hypotheses and controversies for the past two centuries, although a clear understanding of the materials could not be reached. In their Communication (DOI: 10.1002/anie.200905131), J.-P. Echard et al. describe the chemical stratigraphy of the varnishes from five representative Stradivari instruments by using a wide array of analytical techniques. In particular, Stradivari used several red pigments, and may have sought a variety of tints to give his instruments their beautiful appearance.Comment on Article Mentions: Jean-Philippe Echard Stéphane Vaiedelich Balthazar Soulier
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Using Optical Coherence Tomography to Study Wood and Wood Finishes on an 18th century Italian violin
Explore Article Optical Coherence Tomography News (Dec 13 2009)
Feature Of The Week 12/13/09: When available, non-contact, non-destructive and in situ techniques are very much favoured to study the cultural heritage artefacts that are precious witnesses of the past, by limiting the number of micro-samples. Optical Coherence Tomography (OCT) is then especially attractive. OCT potentially allows a better representativity than techniques which require a sample, by increasing the number of instruments studied and the number of measurements on each instrument. During the past few years, many applications of OCT have been reported in the field of art technology and art conservation. An original full-field time-domain OCT system dedicated to ...
Comment on Article Mentions: Pierre & Marie Curie University Mady Elias Gaël Latour
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Structural and optical properties of wood and wood finishes studied using optical coherence tomography: application to an 18th century Italian violin
Explore Article opticsinfobase.org (Nov 13 2009)
Optical coherence tomography (OCT) is especially attractive for the study of cultural heritage artifacts because it is noninvasive and nondestructive. We have developed an original full-field time-domain OCT system dedicated to the investigation of varnished and painted artifacts: an interferometric Mirau objective allows one to perform the scan without moving the works of art. The axial and transverse high resolution (respectively, 1.5 and 1 μm) are well adapted to the detection of the investigated structures (pigment grains, wood fibers, etc.). The illumination spectrum is in the visible range (centered at 630 nm, 150 nm wide) to potentially allow us to ...
Comment on Article Mentions: Jean-Philippe Echard Isabelle Emond Mady Elias
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Applicability of Optical Coherence Tomography at 1.55 μm to the Examination of Oil Paintings
Explore Article SpringerLink Home (Aug 9 2009)
With 47 samples of commercially available oil paints, the applicability of Optical coherence tomography to noninvasive tomography of paint layers was examined. Two different instruments, utilizing near-infrared light with central wavelength of 823nm and, for the first time, 1.55 μm, were used to obtain cross-sectional images. Example tomograms are given; a ray tracing correction of images is also discussed. The tests revealed that applicability of OCT is limited to certain pigments and the longer wavelength is better suited for this application.
Comment on Article Mentions: Nicolaus Copernicus University Anna Szkulmowska David Stifter
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Varnish Thickness Determination by Spectral Optical Coherence Tomography
Explore Article SpringerLink Home (Aug 9 2009)
The applicability of spectral optical coherence tomography (SOCT) for noninvasive and noncontact assessment of varnish layer thickness and structure on easel paintings is discussed. The SOCT tomograms of such objects are presented. Content Type Book ChapterDOI 10.1007/978-3-540-72130-7_58Authors I. Gorczynska, Opificio delle Pietre Dure di Firenze Laboratorio Scientifico Viale Strozzi 1 50100 Firenze ItalyM. Wojtkowski, Opificio delle Pietre Dure di Firenze Laboratorio Scientifico Viale Strozzi 1 50100 Firenze ItalyM. Szkulmowski, Opificio delle Pietre Dure di Firenze Laboratorio Scientifico Viale Strozzi 1 50100 Firenze ItalyT. Bajraszewski, Opificio delle Pietre Dure di Firenze Laboratorio Scientifico Viale Strozzi 1 50100 Firenze ItalyB. Rouba, Opificio ...Comment on Article Mentions: Maciej Wojtkowski Nicolaus Copernicus University Andrzej A. Kowalczyk
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Spectral Domain Optical Coherence Tomography as the Profilometric Tool for Examination of the Environmental Influence on Paintings on Canvas
Explore Article SpringerLink Home (Aug 9 2009)
The changes of surface profile of oil paintings on canvas caused by rapid humidity are examined by spectral OCT. The speed, resolution, and long-time stability of SOCT make this technique appropriate for quantitative determination of surface profile changes.Comment on Article Mentions: Nicolaus Copernicus University Tomasz Bajraszewski Iwona Gorczyńska
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Marginal adaptation of ceramic veneers investigated with en face optical coherence tomography
Explore Article SPIE Digital Library (Jul 13 2009)
The aim of this study was to analyze the quality of marginal adaptation and gap width of Empress veneers using en-face optical coherence tomography. The results prove the necessity of investigating the marginal adaptation after each veneer bonding processComment on Article Mentions: Adrian G. Podoleanu Adrian Bradu Cosmin Sinescu
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Laser induced breakdown spectroscopy (LIBS) applied to stratigrafic elemental analysis and optical coherence tomography (OCT) to damage determination of cultural heritage Brazilian coins
Explore Article SPIE Digital Library (Jul 10 2009)
This work presents a compositional characterization of 1939's Thousand "Réis" and 1945's One "Cruzeiro" Brazilian coins, forged on aluminum bronze alloy. The coins were irradiated by a Q-switched Nd:YAG laser with 4 ns pulse width and energy of 25mJ emitting at 1064nm reaching 3.1010Wcm-2 (assured condition for stoichiometric ablation), forming a plasma in a small fraction of the coin. Plasma emission was collected by an optical fiber system connected to an Echelle spectrometer. The capability of LIBS to remove small fraction of material was exploited and the coins were analyzed ablating layer by layer from patina to the bulk. The ... -
Absolute LIBS stratigraphy with optical coherence tomography
Explore Article SPIE Digital Library (Jul 10 2009)
In this contribution preliminary studies on the application of Optical Coherence Tomography (OCT) to absolute depth calibration of Laser Induced Breakdown Spectroscopy (LIBS) data in application to revealing stratigraphy of easel paintings are presented. The procedure of in-situ monitoring of LIBS by means of OCT is described. Numerical method developed for precise extraction of the depth of the LIBS ablation crater is explained. Results obtained with model paintings are discussed.Comment on Article Mentions: Nicolaus Copernicus University Piotr Targowski
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Dear Prof. Dr. Gary S. Mintz, You are an extraordinary expert in imaging, an intelligence ...
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