Nondestructive Investigation of Paintings on Canvas by Infrared Thermography, Air-Coupled Ultrasound, and X-Ray Radiography
In this paper, shortwave infrared (SWIR), mid-wave infrared (MWIR) thermography, air-coupled ultrasound (ACU), and X-ray radiography results were combined to retrieve the differences between a painting on the canvas sample constructed following the art master rules and an imitation far from it. Advanced image processing techniques including pulsed phase thermography (PPT), principal component thermography (PCT), and partial least square thermography (PLST) were applied to the MWIR images in order to highlight the shapes of subsurface features. Interestingly, additional defects were also discovered since the samples were handmade. Finally, a comprehensive and comparative study of these techniques was conducted to summarize their advantages and disadvantages.
KeywordsPainting on canvas SWIR MWIR Air-coupled ultrasound X-ray radiography Nondestructive evaluation
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