Patent Document ID: 4748678
Application ID: 06863242

Base Claim:
1. A method of storing document data in a filing system comprising the steps of: (a) storing data representing a processed image, which includes the content of an original document, and secondary data added to the document in a first memory region of said filing system; (b) comparing the processed image as stored in said first memory region with the image of the original document in order to detect portions which differ in respective images; (c) classifying the portions which differ as detected in the comparing step (b) according to predetermined classification standards; (d) specifying at least one local region of said processed image which has a predetermined relationship in position that is determined by a selected classification standard with respect to the portion which differs in the processed image; and (e) storing the data that represents said local region in a second memory region of said filing system as retrieval data together with a code that indicates the relationship of said retrieval data to said original document.

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Claim 5:
5. A method of storing document data in a filing system according to claim 1, wherein said retrieval data is stored during the storing step (e) in said second memory region for each of the classifications determined in the classifying step (c).