Results 261 to 270 of about 131,408 (305)

Hyperspectral crack detection in paintings

2015 Colour and Visual Computing Symposium (CVCS), 2015
Several approaches to the crack detection of paintings are available for grayscale and color images, and recently also for spectral images. However, the approaches that are used for the multivariate data are either using a marginal approach or requiring a data reduction which enable the use of grayscale operators.
Hilda Deborah, Noël Richard, Jon Yngve Hardeberg   +2 more
openaire   +1 more source

A cue generator for crack detection

Image and Vision Computing, 1989
Abstract This paper describes a computationally efficient method for identifying weakly visible cracks in images of man-made surfaces. The method relies on a multistage nonlinear filtering process designed to yield maximum response to symmetrical fine structure.
Peter W. Woods, Philip D. Allen
openaire   +1 more source

Token based crack detection

Journal of Intelligent & Fuzzy Systems, 2019
Crack detection has drawn much attention in the last two decades, because of dramatic bloom in monitoring images and the urgent need of corresponding crack detection. However, recent methods have not taken advantage of structure information effectively, resulting in low accuracy when dealing with crack-like noises.
Fan Meng, Zhiquan Qi, Zhensong Chen 0001, Bo Wang 0049, Yong Shi 0001   +4 more
openaire   +1 more source

The dynamic behaviour and crack detection of a beam with a crack

Journal of Sound and Vibration, 1990
Abstract In this paper, an element stiffness matrix of a beam with a crack is first derived from an integration of stress intensity factors, and then a finite element model of a cracked beam is established. This model is applied to a cantilever beam with an edge-crack, and the eigenfrequencies are determined for different crack lengths and locations.
G.-L. Qian, S.-N. Gu, J.-S. Jiang
openaire   +1 more source

Crack detection and vibration behavior of cracked beams

Computers & Structures, 2001
Abstract A theoretical and experimental dynamic behavior of different multi-beams systems containing a transverse crack is presented. The additional flexibility that the crack generates in its vicinity is evaluated using the strain energy density function given by the linear fracture mechanic theory.
P.N. Saavedra, L.A. Cuitiño
openaire   +1 more source

Crack Gages for Detecting Fatigue Crack Initiation

Journal of Structural Engineering, 1987
The use of fatigue crack gages is examined, in order to provide a clear indication of fatigue crack inititation and early subscritical crack growth in structural steel details. The crack gage consists of a thin steel coupon that can be bonded to a structural member in the vicinity of a known stress raiser, such as at the end of a cover plate or near a ...
Charles K. Nmai, Mark D. Bowman
openaire   +1 more source

A Method for Crack Detection on a Concrete Structure

18th International Conference on Pattern Recognition (ICPR'06), 2006
Recently, interest in automatic crack detection on concrete structure images for non-destructive inspection has been increasing. In general, there are various noises such as irregularly illuminated conditions, shading, blemishes and divots in the concrete images. These lead to difficulties for automatic crack detection.
Yusuke Fujita, Yoshihiro Mitani, Yoshihiko Hamamoto   +2 more
openaire   +1 more source

Automated Crack Detection on Concrete Bridges

IEEE Transactions on Automation Science and Engineering, 2016
Detection of cracks on bridge decks is a vital task for maintaining the structural health and reliability of concrete bridges. Robotic imaging can be used to obtain bridge surface image sets for automated on-site analysis. We present a novel automated crack detection algorithm, the STRUM (spatially tuned robust multifeature) classifier, and demonstrate
Prateek Prasanna, Kristin J. Dana, Nenad Gucunski, Basily B. Basily, Hung Manh La, Ronny Salim Lim, Hooman Parvardeh   +6 more
openaire   +1 more source

Thermographic crack detection and failure classification

Journal of Electronic Imaging, 2010
In the case of thermographic inspection, the workpiece is heated in a particular manner followed by the observation of the resulting temperature increase at the material surface by means of an infrared camera. Inhomogeneities such as surface cracks cause a nonuniform distribution of the temperature; consequently, they can be localized in the infrared ...
Beata Oswald-Tranta, Mario Sorger, Paul O'Leary   +2 more
openaire   +1 more source

Holographic detection of cracks

Journal of Strain Analysis, 1974
A brief report is given on the detection of fine cracks in concrete cubes and cylinders by holographic interferometry.
openaire   +1 more source