Clotilde Boust

Clotilde Boust
Ministère de la culture et de la communication · Centre de recherche et de restauration des Musées de France & CNRS PCMTH PSL

PhD Optronics (imaging and perception)

About

45
Publications
10,711
Reads
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190
Citations
Citations since 2017
24 Research Items
105 Citations
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Introduction
Head of the imaging group in C2RMF, Center for research and conservation for French Museum, Paris. https://c2rmf.fr/ Research blog : https://copa.hypotheses.org/
Additional affiliations
September 2013 - present
Center for research and restoration for French museum C2RMF
Position
  • Head of Department
September 2011 - September 2013
Université de Versailles Saint-Quentin
Position
  • Professor (Assistant)
April 2000 - October 2001
Muséum National d'Histoire Naturelle
Position
  • Research Assistant
Education
December 2002 - December 2005
Paris 5 University
Field of study
  • optronic

Publications

Publications (45)
Article
Full-text available
Chasing is one of the main decorative techniques found in metal work. The imprints left by different chasing tools are unique not only to the tool, but also to the chaser. The analysis and characterisation of toolmarks provide vast information that is valuable for the understanding of an object. Microtopography is a non-contact imaging technique th...
Preprint
Full-text available
This paper outlines the use of bidirectional reflectance measurements for thecharacterisation and evaluation of appearance changes in gilded surfaces causedby varnishing and cleaning. Oil and water gilding mock-ups representative of a15th century panel painting were varnished, and a selection of four varnishcleaning methods were applied. By measuri...
Preprint
Full-text available
In the past few decades, there has been intensive research concerning the Unmixing of hyperspectral images. Some methods such as NMF, VCA, and N-FINDR have become standards since they show robustness in dealing with the unmixing of hyperspectral images. However, the research concerning the unmixing of multispectral images is relatively scarce. Thus...
Article
In the past few decades, there has been intensive research concerning the Unmixing of hyperspectral images. Some methods such as NMF, VCA, and N-FINDR have become standards since they show robustness in dealing with the unmixing of hyperspectral images. However, the research concerning the unmixing of multispectral images is relatively scarce. Thus...
Article
Patinas are a form of metal polychromy used to decorate metallic artworks. Due to the nature of the metallic surface, their colour and gloss is perceived differently when the illumination and viewing directions vary. Sparkle effect on surfaces is a physical phenomenom caused by micro-facets on the surface coating which are also perceived with chang...
Article
Full-text available
The famous Persian illustrated manuscript’s page called “Humay meets the Princess Humayun” from Louvre Museum was investigated using multispectral imaging, X-ray fluorescence mapping and Raman spectroscopy for a deepen study of its constitutive materials and painting techniques and to evaluate the state of conservation of the artwork. Cross image t...
Article
Pigment classification of paintings is considered an important task in the field of cultural heritage. It helps to analyze the object and to know its historical value. This information is also essential for curators and conservators. Hyperspectral imaging technology has been used for pigment characterization for many years and has potential in its...
Article
We report the development of a 3D positioner for the elemental mapping of non-flat surfaces of heritage targets and its implementation in the external beam of the AGLAE accelerator, a joint research activity of the IPERION-CH European program. The positioner operates in two steps: 1) object surface is digitized using a 3D scanner implemented in the...
Conference Paper
Full-text available
This article describes several methods, in 2D and 3D, which could be used to increase the knowledge of a precious object. Here we presented a jointed work between the AOROC department of the ENS and the C2RMF [Centre de Recherche et de Restauration des Musées de France]. This crossed research had a common purpose: to enhance the understanding of a...
Article
This scientific study of color prints from chiaroscuro woodcuts is of particular interest and has not yet been carried out on Northern European prints. The aim of this work is to analyze the ink and paper chemical composition, and to define the sequence of printed layers in order to understand how the artists and their workshop achieved visual effe...
Article
Louis Ducos du Huron (1837-1920) dedicated his entire life to the elaboration of physical-chemical processes for color photography. This study aimed at highlighting his unique contribution to three-color printing through 1) an in-depth review of the many protocols he published and 2) the synchrotron-based IR and X-ray microanalysis of fragments sam...
Article
Full-text available
Louis Ducos du Hauron (1837–1920), photographed here by L. Lumière, was one of the pioneers of color photography. Having patented a first three‐color printing process in 1869, he tirelessly sought to improve his processes. In their Communication (DOI: 10.1002/anie.201712617), M. Cotte and co‐workers focus on how he printed positives through an exte...
Article
Full-text available
Louis Ducos du Hauron (1837–1920), hier photographiert von L. Lumière, war ein Pionier der Farbphotographie. Nach der Patentierung seines ersten Verfahrens zum dreifarbigen Druck im Jahr 1869 arbeitete er unermüdlich an der Verbesserung seiner Prozesse. In ihrer Zuschrift (DOI: 10.1002/ange.201712617) untersuchen M. Cotte et al. seine Methoden zum...
Article
Louis Ducos du Huron (1837–1920) dedicated his entire life to the elaboration of physical–chemical processes for color photography. This study aimed at highlighting his unique contribution to three‐color printing through 1) an in‐depth review of the many protocols he published and 2) the synchrotron‐based IR and X‐ray microanalysis of fragments sam...
Poster
Full-text available
In 2016, a collection of Louis Ducos du Hauron heliochromes, among which some diaphanies, was observed and analyzed at the Centre de Recherche et de Restauration des Musées de France (C2RMF) to better understand this primitive indirect photographic color process. The results from three diaphanies (transparent trichrome views) from this collection a...
Conference Paper
Quentin Lemasson, Brice Moignard, Claire Pacheco, Laurent Pichon, Thomas Calligaro, et al.. IBA and VIS-NIR- spectroscopic mappings applied to the analysis of cultural heritage artefacts: last improviments on the AGLAE facility. TECHNART 2017 "Non-destructive and microanalytical techniques in art and cultural heritage", May 2017, Bilbao, Spain. ⟨ha...
Technical Report
https://copa.hypotheses.org/552 Several pigments/colorants were registred using Hasselblad photography imaging under several radiations, from UV (365 nm) to IR (780-1000 nm). We obtained several images : VIS : normal image, in visible domain under visible light (380-780 nm; REF_UV_UV : reflection in UV domain under UV radiations (360-400); UVFC :...
Article
Over the last quarter of the 20th century, chromogenic colour process was the predominant photographic process on the market and has been used by the professionals, artists and the public at large. Today it represents a precious part of our photographic heritage. Unfortunately, some colour prints are very fragile and discolour during display or sto...
Conference Paper
Full-text available
Cet article décrit les principales techniques d’imagerie actuelles et leurs appli­ cations pour la conservation des œuvres d’art. Parution de la publication électronique, novembre 2018 https://www.culture.gouv.fr/Thematiques/Conservation-restauration/Actualites/Publication-electronique-des-journees-d-etude-du-C2RMF
Article
Archaeologists have been interested in the survey and analysis of mobile works of Paleolithic art since their discovery during excavations in the 19th century. Examples of mobile art — made of stone, bone, antler, ivory or clay — are often found as weathered fragments with surface wear that makes the reading of these objects difficult. Since the 19...
Article
Full-text available
Pigments characterization on paintings is usually made with X-ray fluorescence, traditional false color photography and optical microscopy. The use of optical techniques based on reflectance spectra, like reflectance spectrophotometry or hyperspectral imaging, is limited today to some case studies. We would like to improve these optical techniques...
Article
Full-text available
Hyperspectral imaging has been used for pigment characterization on paintings for the last 10 years. It is a noninvasive technique, which mixes the power of spectrophotometry and that of imaging technologies. We have access to a visible and near-infrared hyperspectral camera, ranging from 400 to 1000 nm in 80–160 spectral bands. In order to treat t...
Conference Paper
Full-text available
LED (Light Emitting Diode) based spectral imaging is advantageous for its fast computer controlled switching ability, availability of many different types of LEDs and cost effectiveness. It has been used in some applications like biometrics and arts, however, it has not been explored in film scanning. Here in this paper, we have proposed a LED base...
Article
In this work, we address the problem of having an accurate colorimetric characterization of a scanner for traditional positive film in order to guarantee the accuracy of the color information during the digitization of a movie. The scanning of a positive film is not an usual task, however it can happen for cultural heritage purpose. Art-movies, are...
Chapter
This paper presents the first results of the application of fibre optic visible reflectance spectroscopy to a group of fourteen underglaze polychrome painted tiles from nineteenth century Iran. The measurement of the entire range of colours appearing on the tiles is aimed at investigating the practices of the Persian master potter Ali Muhammad Isfa...
Conference Paper
Full-text available
Since 2006, the Contemporary Art Group al the Research Department of French Museum Conservation and Research Center (C2RMF - Ministry of Culture) has been working on technological obsolescence phenomena. The purpose of this program is to study the impact of technological evolution on contemporary art works and, more precisely, on their preservation...
Article
Full-text available
The advantages of LED lighting are discussed. We report experiments where observers graded the quality of several light-emitting diode (LED) illuminations. One experiment is based on color discrimination and two experiments are based on the judgement of appearance. We conclude that clusters with red, green, blue, and/or amber LEDs impair color disc...
Article
Full-text available
In museum, the choice of light, with a particular color temperature, impact the visual appearance of artworks. Visual appearance is part of observer's perception and contributes to the appraisal of the object. When we change the visual appearance of an artwork, does it modify the meaning given by the artist and does it disturb our comprehension of...
Article
Full-text available
We studied the preference judgment of pictorial images by image experts and naive observers. We first asked image experts to improve pictorial images the way they preferred. Then, we showed the different versions of each image to naive observers and asked them which version they preferred. To enhance an image, an expert divides it into large areas...
Conference Paper
Full-text available
Computer graphics provides a powerful tool to study lighting and visual signalling as well as information requirements of transport and traffic. However, real-world luminance dynamic range is often too high for display devices. Compression must be achieved using a so-called "tone-mapping" operator, and the question arises whether tampering with the...
Conference Paper
Full-text available
We have studied the preference judgement of pictorial images with two types of population: image experts and naive observers. We used eight images of indoor and outdoor scenes. The images were first presented to image experts working in pre-press companies. We asked them to improve the images the way they preferred and to comment on their manipulat...

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Projects

Projects (2)
Archived project
The "CLARO" project deals with the analysis of the inks (pigments and colorants) and the watermarks of color prints carried out in Germany, France and the Netherlands between 1508 and 1640. This archaeometric study of color prints from chiaroscuro woodcuts is of particular interest for those artworks still unfamiliar with this type of approach. The aim of this work is to analyze the ink and paper chemical composition, and to define the sequence of printed layers in order to understand how the artists and their workshop achieved visual effects. The methodology, entirely non-invasive and non-destructive, consists in the complementary use of imaging and spectroscopic techniques. On one hand, imaging techniques provide microscopic and macroscopic observations of the color prints. Together with false color infrared photography (IRFC), they allow a first evaluation of the pigments and dyes used in the inks and the study of their sequence of application. On the other hand, fiber optics reflectance spectroscopy (FORS) in infrared and visible ranges, X-ray fluorescence spectroscopy (XRF), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy allow the detection of presence of paper treatments and the characterization of pigments and in some cases dyes. Finally, the study of watermarks by transmitted light provides information about the origin of the paper support. We shall see the great potentiality and ability of the imaging and spectroscopic methodology, totally non-invasive, and for the first time the results on the chiaroscuro woodcuts produced in Northern Europe between the 16th and 17th century.