Banknote Recognition Unit Using Dual Infrared Channels
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Solution Overview
Problem
Current banknote recognition systems often misidentify soiled notes as counterfeit due to their reliance on single-channel infrared output analysis, failing to distinguish between oil stains and counterfeit features, and locally soiled portions are mistakenly classified as counterfeit.
Innovation Solution
The proposed solution involves a banknote recognition unit that utilizes both reflected and transmitted infrared outputs to differentiate between soiled and counterfeit portions by comparing pixel values against reference templates, with a secondary determination step to assess the size and location of abnormal areas, thereby reducing misclassification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-channel infrared output analysis is used for banknote recognition, then the recognition process is simple and fast, but soiled notes are misidentified as counterfeit
Solution Approach 1:
The patent divides the infrared analysis into two separate channels: reflected infrared output and transmitted infrared output. Each channel provides different information about the banknote - the reflected channel detects counterfeit features while the transmitted channel detects soiled portions. By segmenting the analysis into these two independent channels, the system can simultaneously maintain fast processing speed and high authentication accuracy without misidentifying soiled notes as counterfeit.
2Device complexity
If reflected infrared output alone is used to detect counterfeit portions, then the detection process is simple, but soiled portions are mistakenly classified as counterfeit
Solution Approach 1:
The patent introduces transmitted infrared output as an intermediary channel that mediates between the reflected infrared output and the final counterfeit determination. The transmitted infrared output serves as a reference that helps distinguish between genuine soiled portions and counterfeit features. By using this intermediary channel, the system achieves precise counterfeit detection without increasing overall system complexity, as both channels are processed through the existing optical sensor framework.
3Reliability
If multiple infrared output channels are analyzed to distinguish soiled from counterfeit portions, then authentication accuracy is improved, but the recognition process becomes more complex
Solution Approach 1:
The patent merges the analysis of reflected infrared output and transmitted infrared output into a unified authentication process. Both channels are processed simultaneously by the optical line sensor and integrated by the authenticity determination unit to reach a final determination. This merging approach improves authentication accuracy by combining complementary information from both channels while avoiding the need for separate, complex analysis systems, as the entire process uses the same hardware infrastructure.
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 effectively reduces the misidentification of soiled notes as counterfeit by accurately distinguishing between oil stains and genuine features, and correctly classifying locally soiled portions, enhancing the accuracy of banknote authentication.
Implementation Method 1
A portion printed with infrared non-absorbing ink absorbs visible light and does not absorb infrared light. Thus, the pattern printed with this ink is visually observable under a visible light source, while the pattern cannot be imaged even with an optical line sensor under an infrared light source
Implementation Method 2
a counterfeit portion printed not with infrared non-absorbing ink but with infrared absorbing ink absorbs infrared light. Thus, the reflected infrared output and the transmitted infrared output are both low
Data Source
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AI summary
The present invention provides a banknote recognition unit capable of reducing misdetermination of a soiled note as a counterfeit note, a banknote handling device, and a banknote recognition method. The banknote recognition unit includes a first determination unit that compares an infrared reflection image and a first reference data set to determine whether the infrared reflection image includes an abnormal area that is outside a tolerance relative to the first reference data set, a second determination unit that compares a determination target area, corresponding to the abnormal area, of an infrared transmission image with a second reference data set to determine whether the determination target area is within a tolerance relative to the second reference data set, and a main determination unit that executes authenticity determination processing on an area at least excluding the abnormal area of the infrared reflection image when the determination target area is within the tolerance.