1. A computer readable medium embodying instructions executable by a processor to perform a method for determining a blob-like structure in a target image, the method comprising: receiving an input target image is received; determining a mean curvature of the input target image; smoothing the mean curvature is smoothed using a scale that determines a size of the blobs to be found; finding a blob-like structure in the input target image as a portion of the input target image where a smoothed curvature is higher than a threshold value; and outputting a result including an indication of the blob-like structure.