1. A method for visualizing an object of interest, said method comprising: obtaining an image of an object of interest; automatically separating the image into tissue clusters; automatically selecting foreground clusters from the tissue clusters, wherein each of the foreground clusters represents a first group of voxels that defines an object or region for segmentation, wherein the foreground clusters are represented by a first shade or color; identifying background clusters based on the selected foreground clusters, wherein each of the background clusters represents a second group of voxels separated from the foreground clusters, wherein the background clusters are represented by a second shade or color that differs from the first shade or color; generating a set of contours based on the selected foreground clusters and the identified background clusters; automatically selecting a contour from the set of contours; automatically generating the contour based on the selected foreground clusters and the identified background clusters; and displaying an image of the object of interest including the foreground clusters, the background clusters, and the contour.