Browsing by Issue Date, starting with "2000-05"
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- Linguística, filosofia da linguagem e operações cognitivas: a propósito da noção de presentePublication . Sousa, OtíliaO presente trabalho pretende ser uma pequena achega, do ponto de vista linguístico, a uma das noções mais discutidas em filosofia: a noção de presente...
- Estimation of 3D shapes using active surface modelsPublication . Nascimento, Jose; Marques, Jorge S.This paper addresses the estimation of surfaces from a set of 3D points using the unified framework described in [1]. This framework proposes the use of competitive learning for curve estimation, i.e., a set of points is defined on a deformable curve and they all compete to represent the available data. This paper extends the use of the unified framework to surface estimation. It o shown that competitive learning performes better than snakes, improving the model performance in the presence of concavities and allowing to desciminate close surfaces. The proposed model is evaluated in this paper using syntheticdata and medical images (MRI and ultrasound images).