Encontrados 4 documentos, a visualizar página 1 de 1
Variational image segmentation for endoscopic human colonic aberrant crypt foci
Figueiredo, I. N.; Figueiredo, P. N.; Stadler, G.; Ghattas, O.; Araújo, A.The aim of this paper is to introduce a variational image segmentation method for assessing the aberrant crypt foci (ACF) in the human colon captured in vivo by endoscopy. ACF are thought to be precursors for colorectal cancer, and therefore their early detection may play an important clinical role. We enhance the active contours without edges model of Chan and Vese to account for the ACF’s particular structure...
Modeling and numerical study of actuator and sensor effects for a laminated pie...
Costa, L.; Figueiredo, I.; Leal, R.; Oliveira, P.; Stadler, G.The aim of this paper is to derive a reduced model for a piezoelectric plate and to study its actuator and sensor capabilities. In the first part, we focus on the asymptotic modeling for thin plates formed by stacking layers of different piezoelectric materials. In the asymptotic model, the mechanical and electric unknowns are shown to be partly decoupled. In the second part, we study the actuator and sensor ca...
Numerical experiments for segmenting medical images using level sets
Araújo, A.; Comissiong, D. M. G.; Stadler, G.Image segmentation is the process by which objects are separated from background information. Structural segmentation from 2D and 3D images is an important step in the analysis of medical image data. In this technical report, we utilize level set algorithms and active contours without edges to segment two and three-dimensional image data. Besides synthetical data, we also use magnetic resonance images of the hu...
Smart capabilities of a laminated piezoelectric plate model
Costa, I.; Figueiredo, I.; Leal, R.; Oliveira, P.; Stadler, G.This paper focuses on the modelling and analysis of actuator and sensor effects for thin laminated plates, which are formed by stacking several layers of different piezoelectric materials. We first discuss features and properties of a two-dimensional asymptotic model for a piezoelectric anisotropic plate, whose unknowns are the Kirchhoff-Love displacement and the electric potential. We prove that the latter is ...
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