DOCUMENT AUTHENTICATION USING EXTRACTED DIGITAL FINGERPRINTS

摘要

Methods and systems for detecting changes, alterations and forgeries in documents utilize digital fingerprinting. A set of documents of a given type that are known to be altered or forgeries are scanned and “fingerprinted” to build a forgery database. Suspect documents are scanned and the resulting fingerprint data is used to query the forgery database to look for matching records, although a match need not be exact. Matches may be counted and compared to a threshold number to assess a confidence that a document is forged or not. The fingerprinting may be directed to at least one authentication region of a document, and one or more features in a region may be incorporated into a fingerprint of the document.

主权项

1. A method comprising:
acquiring digital image data of an image of at least a selected authentication region of a document, wherein the document has been forged or altered at least in the authentication region from its original state; extracting at least one feature from the acquired image data from the authentication region; combining the extracted features to form a digital fingerprint of the forged document; designating the digital fingerprint as tending to evidence a forgery or alteration; storing the designated digital fingerprint in a database record for use in detecting forged or altered documents; and repeating the foregoing steps over additional documents that have been forged or altered so as to build a forgery database comprising multiple digital fingerprint records for use in detecting forged or altered documents.