Banknote Edge Foreign Object Detection via Transmission and Remission Imaging
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Solution Overview
Problem
Existing banknote processing systems inaccurately detect adhesive strips due to distortions or deformations, leading to unnecessary sorting and destruction of banknotes.
Innovation Solution
A device and method utilizing both transmission and remission properties of electromagnetic radiation to differentiate between banknote edge profiles, allowing for reliable detection of foreign objects like adhesive strips by comparing spatially resolved sensor signals from transmission and remission images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If adhesive strip detection is based solely on transmission image of the banknote, then detection simplicity is maintained, but false detection occurs due to banknote distortions or deformations being mistaken for adhesive strips
Solution Approach 1:
The patent combines transmission imaging and remission imaging into a unified detection system. By merging the information from both imaging modes, the system can differentiate between actual adhesive strips and banknote deformations, resolving the contradiction between simple detection and reliable detection.
Solution Approach 2:
The remission image serves as an intermediary reference that helps validate the transmission image data. By comparing edge profiles from both imaging modes, the system can identify false positives in the transmission image caused by banknote deformations, thereby improving detection reliability without significantly increasing system complexity.
2Reliability
If both transmission and remission properties are used for detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The sensor device is designed to perform multiple functions: capturing both transmission images and remission images using the same hardware platform. This multi-functionality allows the system to improve detection reliability without proportionally increasing device complexity, as a single sensor system accomplishes what would otherwise require separate dedicated systems.
Solution Approach 2:
The patent adds the remission imaging dimension to the existing transmission imaging approach. By incorporating this additional dimensional data (reflectance properties in addition to transmission properties), the system achieves more reliable detection while managing complexity through integrated sensor design rather than completely separate systems.
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
Accurately distinguishes banknotes with adhesive strips from those with distortions or deformations, preventing incorrect sorting and destruction, and ensuring reliable detection of foreign objects along the banknote edges.
Implementation Method 1
at least one sensor for detecting electromagnetic radiation transmitted by a document of value and generating corresponding first sensor signals
Implementation Method 2
for detecting electromagnetic radiation remitted by the document of value and generating corresponding second sensor signals
Data Source
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AI summary
The invention relates to a device and to a method for examining value documents (3), in particular banknotes, and to a value document processing system having at least one sensor for detecting an electromagnetic radiation transmitted by a value document (3) and generating corresponding first sensor signals and for detecting an electromagnetic radiation remitted by the value document (3) and producing corresponding second sensor signals and an evaluation device for examining whether the value document (3) has a foreign object (4), in particular an adhesive strip, taking into account first and second sensor signals which correspond to the electromagnetic radiation transmitted or remitted in each case in the region of the edge of the value document (3). The invention prevents deformations (5) in the region of the edge of value documents (3) from being identified as foreign objects (4).