Atenção: Todas as denúncias são sigilosas e sua identidade será preservada.
Os campos nome e e-mail são de preenchimento opcional
Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.creator | Estrozi, Leandro Farias | - |
Autor(es): dc.creator | Bianchi, Andrea Gomes Campos | - |
Autor(es): dc.creator | Rios Filho, Luiz Gonzaga | - |
Autor(es): dc.creator | César Júnior, Roberto Marcondes | - |
Autor(es): dc.creator | Costa, Luciano da Fontoura | - |
Data de aceite: dc.date.accessioned | 2019-11-06T13:24:42Z | - |
Data de disponibilização: dc.date.available | 2019-11-06T13:24:42Z | - |
Data de envio: dc.date.issued | 2012-08-08 | - |
Data de envio: dc.date.issued | 2012-08-08 | - |
Data de envio: dc.date.issued | 1999 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/123456789/1265 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/capes/554823 | - |
Descrição: dc.description | This article presents a careful comparative evaluation of two techniques for numerical curvature estimation of 2D closed contours (more specifically closed, regular and simple parametric curves). The considered methods are: (a) a 1-D Fourier-based approach; and (b) a 2-D Fourier-based approach involving the embedding of the contour into a 2-D regular surface (presented for the first time in this article). Both these techniques employ Gaussian smoothing as a regularizing condition in order to estimate the first and second derivatives needed for curvature estimation. These methods are considered according to a multiresolution approach, where the standard deviation of the Gaussians are used as scale parameters. The methods are applied to a standard set of curves whose analytical curvatures are known in order to estimate and compare the errors of the numerical approaches. Three kinds of parametric curves are considered: (i) curves with analytical description; (ii) curves synthesized in terms of Fourier components of curvature; and (iii) curves obtained by splines. A precise comparison methodology is devised which includes the adoption of a common spatial quantization approach (namely square box quantization) and the explicit consideration of the influence of the related smoothing parameters. The obtained results indicate that the 1- D approach is not only faster, but also more accurate. However, the 2-D approach is still interesting and reasonably accurate for applications in situations where the curvature along the whole 2-D domains is needed. | - |
Idioma: dc.language | en | - |
Palavras-chave: dc.subject | Performance evaluation | - |
Palavras-chave: dc.subject | Fourier transform | - |
Palavras-chave: dc.subject | Differential geometry | - |
Palavras-chave: dc.subject | Numerical techniques | - |
Palavras-chave: dc.subject | Cuvature estimation | - |
Título: dc.title | Comparing curvature estimation techniques | - |
Aparece nas coleções: | Repositório Institucional - UFOP |
O Portal eduCAPES é oferecido ao usuário, condicionado à aceitação dos termos, condições e avisos contidos aqui e sem modificações. A CAPES poderá modificar o conteúdo ou formato deste site ou acabar com a sua operação ou suas ferramentas a seu critério único e sem aviso prévio. Ao acessar este portal, você, usuário pessoa física ou jurídica, se declara compreender e aceitar as condições aqui estabelecidas, da seguinte forma: