1. A system for active lighting for stereo reconstruction of edges ( 11 ), the system comprising: a plurality of lights ( 14 ) positioned to illuminate the edges ( 11 ) differently at different times; at least two cameras ( 12 ) positioned to view the edges ( 11 ) from different directions; and a processor ( 16 ) configured to receive images from a first of the different directions, different images from the first direction being of the edges ( 11 ) illuminated differently by the lights ( 14 ), configured to receive images from a second of the different directions, different images from the second direction being of the edges ( 11 ) illuminated differently by the lights ( 14 ), and configured to generate the stereo reconstruction of the edges ( 11 ) as a function of the images from the first and second different directions.