Results 1 to 10 of about 127,992 (197)

Colour cluster analysis for pigment identification [PDF]

SPIE Proceedings, 2008
This paper presents image processing algorithms designed to analyse the colour CIE Lab histogram of high resolution images of paintings. Three algorithms are illustrated which attempt to identify colour clusters, cluster shapes due to shading and finally to identify pigments.
Martinez, Kirk, Goodall, Simon
openaire   +3 more sources

Reflectance Imaging Spectroscopy (RIS) for Operation Night Watch: Challenges and Achievements of Imaging Rembrandt’s Masterpiece in the Glass Chamber at the Rijksmuseum

Sensors, 2021
Visible and infrared reflectance imaging spectroscopy is one of the several non-invasive techniques used during Operation Night Watch for the study of Rembrandt’s iconic masterpiece The Night Watch (1642).
Francesca Gabrieli, John K. Delaney, Robert G. Erdmann, Victor Gonzalez, Annelies van Loon, Patrick Smulders, Roy Berkeveld, Robert van Langh, Katrien Keune   +8 more
doaj   +1 more source

A Comparative Study of the Method to Rapid Identification of the Mural Pigments by Combining LIBS-Based Dataset and Machine Learning Methods

Chemosensors, 2022
Due to the similar chemical composition and matrix effect, the accurate identification of mineral pigments on wall paintings has brought great challenges.
Duixiong Sun, Yiming Zhang, Yaopeng Yin, Zhao Zhang, Hengli Qian, Yarui Wang, Zongren Yu, Bomin Su, Chenzhong Dong, Maogen Su   +9 more
doaj   +1 more source

Mapping Pigments in a Painting with Low Frequency Electron Paramagnetic Resonance Spectroscopy

Heritage, 2021
An electron paramagnetic resonance (EPR) mobile universal surface explorer (MOUSE) was recently introduced for noninvasively studying paramagnetic pigments in paintings.
Shane McCarthy, Haley Wiskoski, Joseph P. Hornak   +2 more
doaj   +1 more source

Identification of Chromobacterium violaceum: Pigmented and Non-pigmented Strains [PDF]

Journal of General Microbiology, 1975
The classification and, therefore, identification of Chromobacterium violaceum has been based upon its ability to produce a violet pigment. Although the organism may yield non-pigmented variants when subcultured on artificial media, the isolation of non-pigmented strains from pathological tissues or from nature had not been reported.
R. SIVENDRA, H. S. LO, K. T. LIM
openaire   +2 more sources

Towards building a Cathodoluminescence (CL) database for pigments: characterization of white pigments

Heritage Science, 2021
Paintings and painted surfaces are considered to be extremely complex due to their multitude of materials and thus form the basis for particularly intricate Cultural Heritage studies.
E. Palamara, P. P. Das, S. Nicolopoulos, L. Tormo Cifuentes, E. Kouloumpi, A. Terlixi, N. Zacharias   +6 more
doaj   +1 more source

Chromatographic Techniques to Separate and Identify Bioactive Compounds in Microalgae

Frontiers in Energy Research, 2022
Microalgae are potential sources for the sustainable production of valuable chemicals including polyphenols, pigments, and ω-3 PUFAs. However, successful exploitation of these high value compounds in the food, healthcare and pharmaceutical sectors ...
Hossein Kiani, Hossein Kiani, Hossein Kiani, Ramón Aznar, Mahesha M. Poojary, Brijesh K. Tiwari, Ronald Halim, Ronald Halim   +7 more
doaj   +1 more source

Identification of black sturgeon caviar pigment as eumelanin

Food Chemistry, 2022
Reported herein is the purification of the pigment of black sturgeon caviar and its unambiguous identification as a typical eumelanin by means of chemical degradation coupled with electron paramagnetic resonance (EPR) evidence. HPLC and LC-MS analysis of oxidative degradation mixtures revealed the formation of pyrrole-2,3,5-tricarboxylic acid (PTCA), a
Panzella L., Benning K., Nesbeth D. N., Setaro B., D'Errico G., Napolitano A., d'Ischia M.   +6 more
openaire   +4 more sources

A Novel Spectral Matching Approach for Pigment: Spectral Subsection Identification Considering Ion Absorption Characteristics

Remote Sensing, 2020
Background: Hyperspectral technology has made it possible to perform completely non-invasive investigations on pigment analysis, in particular, on pigment identification.
Yiyi Liu, Shuqiang Lyu, Miaole Hou, Zhenhua Gao, Wanfu Wang, Xiao Zhou   +5 more
doaj   +1 more source

Automatic classification system of Raman spectra applied to pigments analysis [PDF]

, 2016
Raman spectroscopy is one of the few non-destructive techniques capable of identifying pigments in art works. Raman spectra contain powerful information that can be used to identify unknown compounds and their chemical structures.
González Vidal, Juan José, Pérez Pueyo, Rosanna, Soneira Ferrando, M. José   +2 more
core   +2 more sources