Typical problems concerning to Digital imageprocessing (DIP) and to Digital signals processing require specific models for each particular problem and the characteristics of the data involved. However, usually these ...
Typical problems concerning to Digital imageprocessing (DIP) and to Digital signals processing require specific models for each particular problem and the characteristics of the data involved. However, usually these data show a high degree of uncertainty due to the acquisition system itself, noise or uncertainties related to the nature of the problem. They often require considering different points of view of experts in a single model to determine a set of rules or predicates that would achieve the desired solution. Type-2 fuzzy sets can adequately model such uncertainties. This paper presents a study on different applications of type-2 fuzzy sets in image and signalprocessing, analyzing the main advantages of this type of fuzzy sets in modeling uncertainties. We also review the definitions of type-2 fuzzy sets, their main properties and operations between them.
The development and research of micro and nanostructures for the manufacture of ultrasonic piezoacoustic elements has been carried out. The structures obtained in this work have practical applications for the manufact...
The development and research of micro and nanostructures for the manufacture of ultrasonic piezoacoustic elements has been carried out. The structures obtained in this work have practical applications for the manufacture of piezoelectric and piezoacoustic elements, in particular, for using in liquid flowmeters as receivers and emitters of an ultrasonic signal. A structure of nanocells was obtained that was different from standard piezoelectric elements (disk, cylinder), but with the same coefficients, characteristics, and radiation pattern.
作者：
A KatuninJ v Araújo dos SantosH LopesInstitute of Fundamentals of Machinery Design
Silesian University of Technology Konarskiego 18A 44-100 Gliwice Poland IDMEC
Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portugal DEM
ISEP Instituto Politécnico do Porto Rua Dr. António Bernardino de Almeida 431 4249-015 Porto Portugal
Shearography is an effective non-destructive testing method which already found numerous applications in structural damage identification and for various industrial branches. This method, however, consider the detecti...
Shearography is an effective non-destructive testing method which already found numerous applications in structural damage identification and for various industrial branches. This method, however, consider the detection and localization based on the irregularities found on rotation fields. This paper presents the concept of non-destructive damage identification in structural elements using modal rotation together with advanced signalprocessing for the enhancement of its sensitivity, thus allowing for overcoming the problem of small damage detectability. The presented approach uses a set modal rotations fields of a beam, initially processed from shearographic phase maps, for undamaged and damage states. The difference in modal rotations, between the two damages states, is initially calculated and afterward is subjected to a wavelet transform. The presented results show the effectiveness of the presented approach in tasks of structural damage identification.
Wireless capsule endoscopy (WCE) can be considered an example of 'disruptive technology' since it represents a bright alternative to traditional diagnostic methodologies. However, currently available clinical ...
详细信息
ISBN:
(纸本)9781457711992
Wireless capsule endoscopy (WCE) can be considered an example of 'disruptive technology' since it represents a bright alternative to traditional diagnostic methodologies. However, currently available clinical products are passive devices whose locomotion is driven by natural peristalsis, with the drawback of failing to capture the images of potential pathological gastrointestinal tract regions, due to the impossibility to control the camera's motion and orientation. As a consequence, many research groups are working to develop active locomotion devices and endoscopic platforms that allow WCE to be performed in a totally controlled manner. In this paper we propose a system to reliably calibrate a Shape-from-Shading system to recover the unknown scale factor immediately prior to a WCE procedure. The system would allow to reconstruct in a metrically accurate fashion the surfaces obtained intraoperatively from the WCE capsule, which can be exploited for accurate trajectory planning and ultimately automatic WCE active capsule navigation. To the best of our knowledge, this is the first practical system for Shape-from-Shading calibration aimed at guidance applications that will finally be applied to an endoscopic active locomotion platform developed by the authors.
暂无评论