Banknote Crack Detection via Optical Transmission Imaging
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Solution Overview
Problem
Banknote processing systems face challenges in detecting cracks on banknotes, which can lead to equipment failures such as jamming, disrupting self-service transactions and requiring manual intervention.
Innovation Solution
A banknote crack detection apparatus and method utilizing an image collection unit, pre-processing, crack detection, and determining units to assess crack length and depth, determining the banknote's qualification based on preset thresholds to prevent jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional crack detection methods are used, then the detection process is simple, but the detection precision is insufficient leading to false positives or negatives
Solution Approach 1:
The patent segments the crack detection process into multiple independent modules: image collection unit, pre-processing unit, crack detection unit, and determining unit. Each module performs a specific function (image acquisition, noise reduction/edge enhancement, crack pixel identification, and threshold-based qualification determination), allowing the complex detection task to be divided into manageable steps that improve overall precision while maintaining systematic organization.
Solution Approach 2:
The pre-processing unit performs preliminary actions on the banknote image before crack detection, including noise reduction and edge enhancement. This preliminary processing improves the quality of input data for the crack detection unit, enabling more accurate crack identification while separating the preprocessing complexity from the core detection logic.
2Reliability
If no crack detection is performed, then the equipment operates continuously, but banknote cracks cause jamming and service disruption
Solution Approach 1:
The system performs preliminary crack detection on banknotes before they enter the main processing channel. By identifying cracked banknotes in advance using the image collection and crack detection units, the system prevents cracked notes from causing jamming downstream, thereby maintaining equipment reliability and avoiding service interruptions.
Solution Approach 2:
The crack detection system acts as an intermediary between banknote input and equipment processing. The determining unit serves as a gatekeeper that decides whether to accept or reject banknotes based on crack detection results, preventing problematic banknotes from entering the equipment and causing failures.
3Productivity
If all banknotes are accepted without inspection, then processing speed is high, but cracked banknotes cause equipment failure
Solution Approach 1:
The system extracts only the necessary inspection functions (crack detection) from the overall banknote processing flow. The image collection unit and crack detection unit perform rapid optical inspection without requiring full physical examination of each banknote, enabling quick rejection of cracked notes while maintaining high processing speed for the overall system.
Solution Approach 2:
The patent replaces manual or mechanical inspection methods with optical-based image collection and digital image processing. The optical transmission image collection and pixel-based crack detection enable automated, high-speed inspection that is both faster than manual methods and reliable enough to prevent equipment failures.
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 detects cracks on banknotes, calculates crack length and depth, and determines the banknote's suitability for circulation, preventing equipment failures and ensuring smooth transactions.
Implementation Method 1
an image collection unit, configured to collect an optical transmission image of an inputted banknote
Data Source
AI summary
A banknote crack detection method and a banknote crack detection apparatus are provided. The banknote crack detection apparatus includes an image collection unit, configured to collect an optical transmission image of an inputted banknote, a pre-processing unit, configured to receive a banknote image signal collected by the image collection unit, and perform foreground region positioning and cutting on the banknote image signal; a crack detection unit, configured to detect whether a crack exists; and a determining unit, configured to determine whether the banknote is qualified according to a detection result of the crack detection unit; and a control unit, configured to control operation of each of the above units.