Demonstration of Napari Interactive Tool to segment vesicles from scratch. This video shows how to use the tool to segment vesicles from scratch. This can be used for example if only a handful of vesicles are present in a tomogram or to quickly build a training set. The tool does not need a probability map. The user puts a point in each vesicle to segment. The compute labels function then instantly refines the vesicle center position and computes the vesicle radius. 30 frames per second.