Review of Advanced Acoustical Imaging Techniques for Nondestructive Evaluation of Art Objects

A 2D-FFT signal processing technique to enhance the contrast of air-coupled ultrasonic C-scans

A NOVEL BI-DIMENSIONAL FOURIER TRANSFORM METHOD TO SURFACE RECONSTRUCTION BY SHADOW MOIRÉ

“Woden surface investigation: an optical Approach based on shadow Moiré”

A direction/orientation-based method for shape measurement by shadow moiré

In this paper, a methodology to process fringe patterns is presented. The core of the signal processing technique is the use of the direction information, which is a modulo 2 pi quantity that locally indicates the direction along which fringes grow at a maximum rate. By using this information, it was possible to perform adaptive and direction/orientation-based operations on fringe images to remove unwanted effects (mainly distortions at the image borders), to enhance the contrast, and to extract the phase information encoded. The method has been applied on shadow-moire interferograms with carrier fringes in order to measure the surface of small objects. The developed algorithm allows proces…

Physics and Art: Look Inside

AIR-COUPLED ACOUSTICAL IMAGING NDE FOR ART OBJECT STUDY

A hybrid frequency-space approach for fringe pattern improvement and phase recovery

VALUTAZIONE DEGLI EFFETTI DI CURVATURA E SCORRIMENTO LOCALE NELLE MISURE DI DEFORMAZIONE MEDIANTE SENSORI FBG

An air-coupled ultrasonic technique for NDE of ancient paintings

Air-coupled imaging method applied to the study and conservation of paintings

Advanced acoustical imaging techniques for non-destructive evaluation of art objects – Review

Ultrasonic imaging techniques for painting diagnostic

Air-coupled imaging method applied to the study and conservation of paintings

A Hybrid Frequency-Space Approach for Shape Measurement by Shadow Moirè Technique with Carrier Fringe Pattern

In this paper, a novel methodology to process fringe pattern is presented. The core of the signal processing technique is the use of the direction information, a modulo 2π quantity that locally informs about the direction along which fringes grow with maximum rate. By using this information, it was possible to perform adaptive, direction - and orientation-based operations on fringe images in order to remove unwanted effects, to enhance the contrast and to extract the phase information encoded. The method has been applied on shadow moiré interferograms with carrier fringes in order to measure the surface of small objects. The developed algorithm allows to process fringes whose phase informat…