RESUMO

To delineate arbitrarily shaped clusters in a complex multimodal feature space, such as the brain MRI intensity space, often requires kernel estimation techniques with locally adaptive bandwidths, such as the adaptive mean shift procedure. Proper selection of the kernel bandwidth is a critical step for a better quality in the clustering. This paper presents a solution for the bandwidth selection, which is completely nonparametric and is based on the sample point estimator to yield a spatial pattern of local bandwidths. The method was applied to synthetic brain images, showing a high performance even in the presence of varying noise level and bias.

Assuntos

Encéfalo/anatomia & histologia , Imageamento por Ressonância Magnética/estatística & dados numéricos , Algoritmos , Engenharia Biomédica , Análise por Conglomerados , Humanos , Interpretação de Imagem Assistida por Computador , Modelos Estatísticos , Estatísticas não Paramétricas