2026-04-29T15:25:29Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/236872024-11-28T19:52:59Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16967

00925njm 22002777a 4500 dc Miró-Nicolau, Miquel author Moyà-Alcover, Gabriel author González-Hidalgo, Manuel author Jaume-i-Capó, Antoni author 2023 This study presents a method to improve state-of-the-art concave point detection methods as the first step towards effectively segmenting overlapping objects in images. The approach relies on analysing the curvature of the object contour. This method comprises three main steps. First, the original image is preprocessed to obtain the curvature value at each contour point. Second, the regions with higher curvatures are selected and a recursive algorithm is applied to refine previously selected regions. Finally, a concave point is obtained for each region by analysing the relative position of their neighbourhood. Furthermore, the experimental results indicate that improving the detection of concave points leads to better division of clusters. To evaluate the quality of the concave point detection algorithm, a synthetic dataset was constructed to simulate the presence of overlapping objects. This dataset includes the precise location of concave points, which serve as the ground truth for evaluation. As a case study, the performance of a well-known application, such as the splitting of overlapping cells in images of peripheral blood smears samples from patients with sickle cell anaemia, was evaluated. We used the proposed method to detect concave points in cell clusters and then separated these clusters by ellipse fitting. Miró-Nicolau M, Moyà-Alcover G, González-Hidalgo M, Jaume-i-Capó A. Improving concave point detection to better segment overlapped objects in images. Multimed Tools Appl. 2023 Aug 14. 10.1007/s11042-023-15382-1 1573-7721 1380-7501 Multimedia Tools and Applications https://hdl.handle.net/20.500.13003/19346 2-s2.0-85168159566 https://hdl.handle.net/20.500.12105/23687 1048894900001 Improving concave point detection to better segment overlapped objects in images