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Figure 4
(a) Light microscopy area of a mock-up paint sample stratigraphy (sample UD1, 2000, National Gallery London) mapped by Ge ATR-FTIR (4000–700 cm−1) coupled to a linear array detector (64 × 192 pixels with 1.56 µm spacing). From bottom to top, embedding resin (polyester), ground layer (lead white in oil), painted layer (azurite and lead white in oil). (b) Classification result on spectra not taking into account their pixel position. Each colour corresponds to one of the 15 classes used in the classification. (c) Result obtained by the spatially enhanced Gaussian mixture modelling. The squares denote zones of identical stochastic distribution of spectra.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 18| Part 5| September 2011| Pages 765-772
https://doi.org/10.1107/S090904951102334X
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