Two approaches for orientation field segmentation based on directional morphology.
Luis Alberto Morales-Hernandez, Federico Manríquez-Guerrero, Iván R. Terol‐Villalobos · Biblioteca Digital da Memória Científica do INPE (National Institute for Space Research) · 2007
In the present paper morphological approaches for segmenting orientation fields are proposed. First, it is investigated the use of directional granulometries and a quadtree structure to extract the main directional structutres of the image. Then, it is proposed a method based on the concept of line-segment and orientation functions. The line segments function is computed from the supremum of directional erosions. This function contains the sizes of the longest lines that can be included in the structure. On the other hand, the orientation function contins their angles. Combining both functions permits the construction of a weighted partition using the watershed transformation. Finally, the elements of the partition are merged using a region adjacency graph (RAG) structure.