Patent Document ID: 8144921
Application ID: 11776520

Base Claim:
1. A computer-implemented method for retrieving an electronic document using invisible junction features, the method comprising: receiving an image of an input electronic document; extracting, with a processor, an invisible junction feature descriptor from the image; and retrieving, with the processor, information for an output electronic document using the invisible junction feature descriptor and a geometric constraint.

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Claim 9:
9. The method of claim 1 , wherein retrieving information for the output electronic document comprises: sorting a plurality of output electronic documents based on a number of feature points in each document; ranking the plurality of output electronic documents using a first geometric constraint to produce a first ranking; ranking the plurality of output electronic documents using a second geometric constraint to produce a second ranking; reconciling the first ranking with the second ranking to generate a third ranking; and selecting information corresponding to an electronic document having a highest rank in the third ranking.