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17 March 2008 Thermographic signal processing through correlation operators in pulsed thermography
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In non-destructive testing by Infrared Thermography it is usually needed to locate defects and region of interests suspected to contain defects. The defects cannot always be observed directly from one single IR image taken at a single given time t. Thus, in the case of pulsed thermography, direct course techniques as the Fourier transform process the information of many images recorded for a given duration into one resulting image. Another way to compile the temporal information of a sequence of images into a single one is to compute a correlation image. This paper details an approach to use a statistical correlation operator to help improving defect detection in pulsed infrared thermography.
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Matthieu T. Klein, Clemente Ibarra-Castanedo, Abdelhakim Bendada, and Xavier P. Maldague "Thermographic signal processing through correlation operators in pulsed thermography", Proc. SPIE 6939, Thermosense XXX, 693915 (17 March 2008);

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