24. The system of claim 14 , wherein the feature retrieval unit sorts a plurality of output electronic documents based on a number of feature points in each document, ranks the plurality of output electronic documents using a first geometric constraint to produce a first ranking, ranks the plurality of output electronic documents using a second geometric constraint to produce a second ranking, reconciles the first ranking with the second ranking to generate a third ranking, and selects information corresponding to an electronic document having a highest rank in the third ranking.
24. The system of claim 14 , wherein the feature retrieval unit sorts a plurality of output electronic documents based on a number of feature points in each document, ranks the plurality of output electronic documents using a first geometric constraint to produce a first ranking, ranks the plurality of output electronic documents using a second geometric constraint to produce a second ranking, reconciles the first ranking with the second ranking to generate a third ranking, and selects information corresponding to an electronic document having a highest rank in the third ranking. 25. The method of claim 24 , wherein the feature retrieval unit ranks the plurality of output electronic documents using the first geometric constraint to produce the first ranking at least partially in parallel with ranking the plurality of output electronic documents using the second geometric constraint to produce the second ranking.