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This work addresses the detection and localization of the faults through a wavelet based subspace decomposition scheme. ... The test artwork is heated and the thermal response of the different layers is captured with the help of a thermal infrared camera. ... State-of-the-art decomposition of thermal responses An SVD based defect detection scheme in artworks using the thermal responses was developed by Vrabie et al.  . ...arXiv:1508.06010v1 fatcat:ud55lzm4jnegzbgh2l7y3bc6p4
Publication in the conference proceedings of EUSIPCO, Bucharest, Romania, 2012 ... These values can then be reshaped in a matrix format indexed by the coordinates (x,y), providing two images for the diagnostic of artworks. ... methods to estimate and remove the trend or adaptation of methods insensitive to trend such as ICA-wavelet decomposition  . ...doi:10.5281/zenodo.42986 fatcat:xvgqnnzwifcwxi6yv7gun7ouwy
Further, image processing based on the Hilbert transform increases defect detection and characterization. ... Even if a maximum ΔT slightly exceeding 1 °C was detected during the PuCT test of the inlay sample, it is shown that this is enough for detecting several defects. ... An efficient scheme based on wavelet subspace decomposition was used, which helped in the identifying of otherwise invisible weaker faults. ...doi:10.3390/app10124233 fatcat:enaejinlazb3phsbzmhrf7wmp4
New pulsed thermography processing techniques that improve upon the results of the existing techniques were developed. 3. A proof-of-concept for detecting subsurface ink writings in documents. 4. ... Current common signal processing techniques are evaluated for their effectiveness in enhancing subsurface writings found within a set of test documents. ... Acknowledgments Special thanks to Pedro Sevilla and James Peterson of the Space Dynamics Laboratory for the use of their equipment and helping with the acquisition of the thermal images. ...doi:10.26076/63f2-eb77 fatcat:5pilb5532bco5joesfkmdkwwyq