Ultrasonic Value Document Irregularity Detection
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Solution Overview
Problem
Existing methods for detecting irregularities in value documents, such as adhesive strips, folds, and material removal, using ultrasonic transmission are hindered by noisy data and low spatial resolution, making it difficult to accurately identify these features.
Innovation Solution
A method that records ultrasound data in a spatially resolved manner, compares it to a model of reference documents without irregularities, and uses a deviation data record to indicate the presence of irregularities, employing a device with a data processing unit to execute this comparison and determine the presence of adhesions, folds, or material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic transmission measurement is used to detect irregularities in value documents, then the detection capability for adhesive strips and folds is improved, but the measurement data becomes very noisy and spatial resolution is significantly lower than with optical examinations
Solution Approach 1:
The patent segments the ultrasonic measurement process into multiple discrete measurement points across the document surface. By taking measurements at numerous separated locations and comparing each to reference values, the system achieves both noise tolerance and adequate spatial resolution for detecting irregularities like adhesive strips and folds.
Solution Approach 2:
The patent changes the ultrasonic measurement parameters by using frequency-dependent attenuation coefficients and comparing against reference documents of the same type. This parameter-based approach allows the system to filter noise while maintaining sensitivity to actual irregularities, resolving the contradiction between reliability and precision.
2Reliability
If ultrasonic transmission data is used to detect irregularities, then the ability to detect adhesive strips is improved, but the data becomes very noisy making detection difficult
Solution Approach 1:
The patent implements feedback by comparing measured ultrasonic attenuation at each point against reference attenuation values from documents of the same type. This feedback mechanism allows the system to distinguish actual irregularities from noise by identifying deviations from the expected reference pattern.
Solution Approach 2:
The patent uses reference documents as copies of the ideal state. By creating and storing ultrasonic measurement data from multiple reference documents of the same type, the system establishes a noise-filtered baseline that enables accurate detection of irregularities in test documents without being affected by measurement noise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for a high degree of accuracy in detecting irregularities, even when their influence on ultrasonic properties is small, improving the reliability of identifying adhesive strips, folds, and material removal on value documents.
Implementation Method 1
an ultrasound data record is recorded which describes at least one ultrasound property, in particular the ultrasound transmission, of the value document in a spatially resolved manner
Data Source
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AI summary
The invention relates to a method for examining a value document of a specified value document type for the presence of at least one irregularity of at least one specified type, such as an irregularity in the form of at least one attachment, preferably an adhesive strip, and/or a fold and/or a material removal, wherein an ultrasonic data set is recorded, which describes at least one ultrasonic property, preferably the ultrasonic transmission, of the value document in a spatially resolved manner, a deviation data set is determined, which describes a deviation between the ultrasonic data set and a model in a spatially resolved manner and is determined in such a way that the deviation described by the deviation data set is minimal in relation to the model, wherein the model comprises a model for the spatial dependence of the at least one ultrasonic property of reference value documents of the specified value document type without irregularities of the at least one specified type, and the deviation data set is used to examine whether there is an indication of an irregularity of the at least one type on the value document. The invention further relates to means for performing the method.