I’m using the local threshold effect to segment different kinds of tissues (eg. lung parenchyma), and I was wondering about how does the segmentation algorithms work in the extension.
I read that the effect adds connected voxels to segments that are within a specified threshold (that could be selected either manually or automatically) by performing a flood fill based on masking, growcut or watershed. So, my question is: how is the starting point (i.e. the point from which the connected voxels within the intensity range are added) of the algorithms chosen? And, is there any difference with simple thresholding if I don’t ctrl+left click? In other words, once the theshold is selcted, is the flood fill automatic or I necessary have to manually ctrl+left click?