Method and apparatus for comparing document features using texture analysis
First Claim
1. A method of determining a level of similarity between a feature in a subject document and expected characteristics of said feature, the method comprising:
- a) obtaining a digital image of at least a portion of said document;
b) isolating said feature in said digital imagec) gathering data from an analysis of said featured) comparing data gathered in step c) with expected data from expected characteristics of said featuree) generating a score based on a comparison between said data and said expected datawherein said expected characteristics are based on methods used to manufacture said subject document.
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Accused Products
Abstract
Systems and methods for assisting in the determination of the authenticity of security documents based on known characteristics of similar but authentic security documents. The system and methods use digital processing to capture a digital image of the document being examined and they use a feature localization or detection technique to search for a specific feature in the document based on a stored image of a similar feature from an authentic document. Once the feature on the subject document has been found, the digital image of the localized feature is transformed, by applying mathematical transforms or other image/mathematical operators, such that the result will have distinguishing characteristics that can be derived or analyzed. When the distinguishing characteristics have been analyzed, these are then compared to the stored distinguishing characteristics of similar features from known authentic documents. Based on the comparison, a score is then generated that is indicative of how similar or how different the distinguishing characteristics of the feature being examined are from the features from known authentic documents. The system may also be used such that multiple features from a single document are assessed and scored separately from one another with a final aggregate or weighted score being provided to the user for the whole document.
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Citations
21 Claims
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1. A method of determining a level of similarity between a feature in a subject document and expected characteristics of said feature, the method comprising:
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a) obtaining a digital image of at least a portion of said document; b) isolating said feature in said digital image c) gathering data from an analysis of said feature d) comparing data gathered in step c) with expected data from expected characteristics of said feature e) generating a score based on a comparison between said data and said expected data wherein said expected characteristics are based on methods used to manufacture said subject document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for determining a printing process used to create a document, the method comprising:
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a) selecting at least one test to be applied to said document; b) obtaining a digital image of a relevant area of said document c) applying said at least one test to said image of said relevant area d) gathering data from said at least one test e) retrieving reference data related to an expected printing process f) comparing said reference data with data gathered from said at least one test g) determining a score based on a level of similarity between said reference data and said data gathered from said at least one test. - View Dependent Claims (17, 18, 19)
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20. Computer readable media having embodied thereon computer instructions for executing a method of determining a level of similarity between a feature in a subject document and expected characteristics of said feature, the method comprising:
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a) obtaining a digital image of at least a portion of said document; b) isolating said feature in said digital image c) gathering data from an analysis of said feature d) comparing data gathered in step d) with expected data from expected characteristics of said feature e) generating a score based on a comparison between said data and said expected data wherein said expected characteristics are based on methods used to manufacture said subject document.
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21. Computer readable media having embodied thereon computer instructions for executing a method for determining a printing process used to create a document, the method comprising:
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a) selecting at least one test to be applied to said document; b) obtaining a digital image of a relevant area of said document c) applying said at least one test to said image of said relevant area d) gathering data from said at least one test e) retrieving reference data related to an expected printing process f) comparing said reference data with data gathered from said at least one test g) determining a score based on a level of similarity between said reference data and said data gathered from said at least one test.
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Specification
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- Resources
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Current AssigneeCanadian Bank Note Company, Limited
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Original AssigneeCanadian Bank Note Company, Limited
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InventorsO'Neil, David Giles
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current358/448
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CPC Class CodesG07D 7/2016 using feature extraction, e...G07D 7/206 Matching template patterns
