Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/3760
Título: Towards a formally designed and verified embedded operating system: case study using the B method
Autor: Passos, André Brito
Orientador: Sousa, Simão Melo de
Faria, Jos é Miguel
Palavras-chave: Sistemas operativos
Método B
Data de Defesa: 2009
Resumo: The dramatic growth in practical applications for iris biometrics has been accompanied by relevant developments in the underlying algorithms and techniques. Along with the research focused on near-infrared images captured with subject cooperation, e orts are being made to minimize the trade-o between the quality of the captured data and the recognition accuracy on less constrained environments, where images are obtained at the visible wavelength, at increased distances, over simpli ed acquisition protocols and adverse lightning conditions. At a rst stage, interpolation e ects on normalization process are addressed, pointing the outcomes in the overall recognition error rates. Secondly, a couple of post-processing steps to the Daugman's approach are performed, attempting to increase its performance in the particular unconstrained environments this thesis assumes. Analysis on both frequency and spatial domains and nally pattern recognition methods are applied in such e orts. This thesis embodies the study on how subject recognition can be achieved, without his cooperation, making use of iris data captured at-a-distance, on-the-move and at visible wavelength conditions. Widely used methods designed for constrained scenarios are analyzed.
URI: http://hdl.handle.net/10400.6/3760
Designação: Dissertação apresentada à Universidade da Beira Interior para a obtenção do grau de mestre em Engenharia Informática
Aparece nas colecções:FE - DI | Dissertações de Mestrado e Teses de Doutoramento

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