US 2009/0154778 A1 · IDENTIFICATION AND VERIFICATION OF AN UNKNOWN DOCUMENT ACCORDING TO AN EIGEN IMAGE PROCESS

Abstract

Techniques are described for identifying and validating security documents according to an Eigen image process method. For example, a security document authentication device selects one or more reference documents of different document types, calculates, from the reference documents, one or more Eigen images and Eigen values for the plurality of different document types, and calculates a reference weight coefficient vector of each of the plurality of document types. Upon receiving at least one captured image of an unknown document, the device calculates a weight coefficient vector of the captured image, compares the weight coefficient vector of the captured image and each of the reference weight coefficient vectors of the document types to calculate a plurality of distances, and, based on the plurality of distances, identifies the unknown document as one of the plurality of document types.

Claims24

Dependent claims

A method for verifying an unknown document as one of a plurality of possible document types, the method comprising:

selecting one or more reference documents of different document types;
calculating, from the reference documents, one or more Eigen images and Eigen values for the plurality of different document types;
calculating a reference weight coefficient vector for each of the plurality of document types based on the Eigen images and Eigen values calculated from the reference documents;
receiving at least one captured image of an unknown document;
calculating a weight coefficient vector for the captured image;
comparing the weight coefficient vector of the captured image and each of the weight coefficient vectors of the document types to calculate a plurality of distances;
and
identifying the unknown document as one of the plurality of document types based on the plurality of calculated distances.

5 more elements

A security document authentication device comprising:

a memory storing one or more Eigen images and Eigen values for a plurality of reference document types;
an image capture interface that captures at least one image from an unknown document;
a document processing engine that, in response to the captured image, select one or more of the reference document types as possible reference document types, calculates a reference weight coefficient vector of each of the plurality of possible reference documents, calculates a weight coefficient vector of the captured image, compare the weight coefficient vector of the captured image and each of the weight coefficient vectors of the possible reference documents to calculate a plurality of distances, and, based on the plurality of distances, identifying the unknown document as one of the plurality of possible document types.

Dependencies are inferred from the claim text.

Identification and verification of an unknown document according to an eigen image process

Life of this patent

Identification and verification of an unknown document according to an eigen image process

Life of this patent

Abstract

Claims24