1. An image recognition system for searching documents in a source language comprising: an imaged document, the imaged document being stored in a document database; a source language library for storing source language search terms; an image graph constructor coupled to the document database and the source language library, the image graph constructor configured to generate search term image graphs from the source language search terms, and generate a collection of image graphs representing the imaged document by performing an image graph generation process, the process comprising the steps of: reducing characters included in the source language search terms and in the imaged document to skeleton images comprising a plurality of nodes and a plurality of connections, ordering the plurality of nodes for each skeleton image in a first order; reordering the plurality of nodes for each skeleton image in a second order, wherein the second order is the same for all characters having the same number of nodes connected by the same number of connections between nodes; representing the skeleton images of the characters on the basis of an internal structure of the character by a descriptor corresponding to a plurality of nodes and connections between the plurality of nodes of the character, wherein the descriptor is a Connectivity Key that is unique for a given plurality of nodes and connections between the given plurality of nodes, the unique Connectivity Key corresponding to the second order of the plurality of nodes, and constructing the search term image graphs and collection of image graphs from image graphs of the characters; an image graph database for storing the search term image graphs and the collection of image graphs generated by the image graph constructor; and a comparison module coupled to the image graph database, the comparison module configured to search the imaged documents by comparing the collection of image graphs with selected search term image graphs, wherein if at least one image graph from the collection of image graphs matches the selected search term image graphs, the imaged document is flagged as containing a search term justifying further analysis of the document.