13. A system for processing documents, said system comprising: at least one processor programmed to: acquire an image of a paper document with an imaging device; textualize data from the acquired document image; define specific local partial models of the acquired document image based on regular expressions and geometric proximity, the define operation further programmed to, apply context free regular expression patterns to identify key phrase entities and related entities, group the key phrase entities with the related entities when a specified geometric relationship between the key phrase entities and the related entities is found; extract information from the textualized data according to the local partial models; classify the image of a paper document as being a receipt image; in response to the classification of the image of the paper document as being a receipt image: apply receipt-specific rules to the extracted information; and generate document data from the application of the receipt-specific rules; and wherein the applied receipt-specific rules include user defined rules specified during operation of the imaging device.
13. A system for processing documents, said system comprising: at least one processor programmed to: acquire an image of a paper document with an imaging device; textualize data from the acquired document image; define specific local partial models of the acquired document image based on regular expressions and geometric proximity, the define operation further programmed to, apply context free regular expression patterns to identify key phrase entities and related entities, group the key phrase entities with the related entities when a specified geometric relationship between the key phrase entities and the related entities is found; extract information from the textualized data according to the local partial models; classify the image of a paper document as being a receipt image; in response to the classification of the image of the paper document as being a receipt image: apply receipt-specific rules to the extracted information; and generate document data from the application of the receipt-specific rules; and wherein the applied receipt-specific rules include user defined rules specified during operation of the imaging device. 17. The system according to claim 13 , wherein extraction of information is accomplished without prior knowledge of a model layout of the overall document image.