1. A system, comprising: a fractal signature module to determine a fractal signature of each pixel of a first set of edge pixels of an image, and of a first pixel of the image outside of the first set of edge pixels; a threshold module to determine a first fractal signature threshold from the fractal signatures of the first set of edge pixels; and an edge pixel identification module to compare the fractal signature of the first pixel to the first fractal signature threshold, and selectively identify the first pixel as an edge pixel based on the comparison.