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dc.contributor.authorMartínez-Finkelshtein, Andrei
dc.contributor.authorRamos López, Darío
dc.contributor.authorCastro-Luna, Gracia M.
dc.contributor.authorAlio y Sanz, Jorge L.
dc.date.accessioned2012-07-31T11:42:57Z
dc.date.available2012-07-31T11:42:57Z
dc.date.issued2011
dc.identifier.urihttp://hdl.handle.net/10835/1623
dc.description.abstractIn this paper we describe an adaptive and multi-scale algorithm for the parsimonious t of the corneal surface data that allows to adapt the number of functions used in the reconstruction to the conditions of each cornea. The method implements also a dynamical selection of the parameters and the management of noise. It can be used for the real-time reconstruction of both altimetric data and corneal power maps from the data collected by keratoscopes, such as the Placido rings based topographers, decisive for an early detection of corneal diseases such as keratoconus. Numerical experiments show that the algorithm exhibits a steady exponential error decay, independently of the level of aberration of the cornea. The complexity of each anisotropic gaussian basis functions in the functional representation is the same, but their parameters vary to fit the current scale. This scale is determined only by the residual errors and not by the number of the iteration. Finally, the position and clustering of their centers, as well as the size of the shape parameters, provides an additional spatial information about the regions of higher irregularity. These results are compared with the standard approximation procedures based on the Zernike polynomials expansions.es_ES
dc.language.isoenes_ES
dc.sourceInvestigative ophthalmology and visual science Vol. 52 Nº 8 (2011)es_ES
dc.subjectPolinomios de Zernikees_ES
dc.subjectSuperficie de reconstrucciónes_ES
dc.subjectModelado de superficieses_ES
dc.subjectIrregularidades de la córneaes_ES
dc.subjectFunciones de base radiales_ES
dc.subjectMétodos multi-escalaes_ES
dc.subjectZernike polynomialses_ES
dc.subjectSurface reconstructiones_ES
dc.subjectSurface modelinges_ES
dc.subjectCorneal irregularitieses_ES
dc.subjectGaussian functionses_ES
dc.subjectRadial basis functionses_ES
dc.subjectMulti-scale methodses_ES
dc.titleAn adaptive algorithm for the cornea modeling from keratometric dataes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES


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