We design a two stage image segmentation method, comprising a distance transform estimating neural network and watershed segmentation. It allows segmentation and tracking of colliding objects without any assumptions on object behavior or global object appearance as the proposed machine learning step is trained on contour information only. Our method is also capable of segmenting partially vanishing contact surfaces of visually merged objects. The evaluation is performed on a dataset of collisions of Drosophila melanogaster larvae manually labeled with pixel accuracy. The proposed pipeline needs no manual parameter tuning and operates at high frame rates. We provide a detailed evaluation of the neural network design including 1200 trained networks.
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