1. A system comprising: an image analysis unit that calculates distances between representations of electrodes in an electronic image and that identifies groups based on the calculated distances, wherein each identified group includes a plurality of electrode representations, and wherein a distance between a first electrode representation and a second electrode representation in the electronic image is substantially a same distance as a distance between the second electrode representation and a third electrode representation in the electronic image; and a characterization unit that determines one or more lead types based on the identified groups.