The watershed transform is a well-known approach for image segmentation. Watershed from markers and hierarchical watershed are derived from the watershed transform and are suitable for interactive image segmentation: in the former, the user can edit markers and control the segmentation result; in the latter, the user can select an image partition from a nested set of partitions. We investigate and propose ways to transition from one approach to other. Such transitions can be used to integrate both approaches in such a way that allow us to make full use of the strengths of both. We present examples that illustrate the use of the proposed transitions in conjunction with several interaction possibilities from both approaches.
ResumoA transforirlação 'maters/ied é uma abordagem bastante utilizada eín segmentação de imagens. O waíers/led t\ partir de marcadores e o waZezshed liieráiquico são abordageits derivadas da transformação maíershed e adequadas para segmentação interativa dc imagens: na primeira, o usuário pode editar os mttrcadores coittrolando a partição resultante; na outra, o usuáiio pode selecioriai uma partição num conjunto hierárquico de paitições da imagem. O propósito deste trabalho é estudar a relação entre esses dois paradigmas. Em particular, apiesentainos as condições necessárias e formas de se alternar entre os dois paradigliias ilu in processo de segmentação inteiativa (implementado na ferramenta disponível em http://watershed. sourceforge .net/), de fonna que o usuário possa aproveitar os pontos positivos dc cada uma dessas abordagens para obter a partição desejada.
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