Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/13202
Título: Microscopy image segmentation by active contour models
Autor: Ferreira, Pedro Miguel Raminhos
Orientador: Fonseca, José
Palavras-chave: Segmentation
Active contour
Snakes
Data de Defesa: Mar-2014
Resumo: In this thesis a semi-automated cell analysis system is described through image processing. To achieve this, an image processing algorithm was studied in order to segment cells in a semi-automatic way. The main goal of this analysis is to increase the performance of cell image segmentation process, without affecting the results in a significant way. Even though, a totally manual system has the ability of producing the best results, it has the disadvantage of taking too long and being repetitive, when a large number of images need to be processed. An active contour algorithm was tested in a sequence of images taken by a microscope. This algorithm, more commonly known as snakes, allowed the user to define an initial region in which the cell was incorporated. Then, the algorithm would run several times, making the initial region contours to converge to the cell boundaries. With the final contour, it was possible to extract region properties and produce statistical data. This data allowed to say that this algorithm produces similar results to a purely manual system but at a faster rate. On the other hand, it is slower than a purely automatic way but it allows the user to adjust the contour, making it more versatile and tolerant to image variations.
URI: http://hdl.handle.net/10362/13202
Designação: Dissertação
Aparece nas colecções:FCT: DEE - Dissertações de Mestrado

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