7. The system of claim 1 , wherein the index is constructed, at least in part, by segmenting each of the plurality of images into a respective plurality of segments, and performing a multi-phase contour detection on each respective plurality of segments.
7. The system of claim 1 , wherein the index is constructed, at least in part, by segmenting each of the plurality of images into a respective plurality of segments, and performing a multi-phase contour detection on each respective plurality of segments. 8. The system of claim 7 , wherein each segment of each respective plurality of segments is identified based upon at least one of color and gradient changes.