1. A method for segmenting one or more objects in a subject image resulting from subjecting one or more objects to imaging using an imaging apparatus, comprising: generating image object borders comprising: performing edge detection on the subject image; and identifying object border locations, in the subject image, corresponding to merely outline edges of respective one or more objects; generating a geometric difference of at least some of the image object borders for respective one or more slices of the subject image; and identifying one or more transitions between two or more objects in the subject image using one or more the geometric difference values.