Banknote Skew Detection Using Sector Segmentation
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Solution Overview
Problem
Existing ATM systems struggle to accurately detect and correct skew angles of banknotes, particularly when banknotes are deformed into irregular shapes, leading to potential jams and operational errors.
Innovation Solution
The apparatus includes a plurality of sensors arranged on the conveying route at regular intervals to detect tips of banknotes and a microprocessor that calculates skew angles for each sector of the banknotes, enabling detection of various types of skews, including one-way and V-shaped skews.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pair of sensors disposed at both ends of a plurality of sensors provided on a conveying route is used to detect skew, then one-way skew detection is relatively useful, but it cannot effectively detect irregular shape skews such as V-shaped skew at both ends inclined in different directions
Solution Approach 1:
The patent divides the banknote into multiple sectors (first sector and second sector) along its width direction and calculates skew angles separately for each sector. This segmentation allows the system to detect different skew types (one-way skew, V-shaped skew) by comparing skew angles across different sectors, thereby resolving the limitation of detecting only one-way skew with conventional sensor pairs.
Solution Approach 2:
The patent calculates skew angles for different sectors of the banknote separately and compares them to detect various skew types. By analyzing local skew characteristics in different sectors, the system can identify both one-way skew and V-shaped skew conditions, improving adaptability to different deformation patterns while maintaining measurement precision.
2Reliability
If conventional skew detection methods are used, then simple sensor arrangement is maintained, but detection accuracy for deformed banknotes deteriorates leading to potential jams and operational errors
Solution Approach 1:
The patent segments the banknote into multiple sectors and calculates skew angles for each sector separately. This allows detection of complex deformation patterns (V-shaped skew, crumpled states) that conventional methods miss, thereby improving reliability by preventing jams and operational errors caused by undetected skew variations.
Solution Approach 2:
The patent uses detected skew angles from multiple sectors to determine the overall skew state of the banknote. By comparing skew angles across sectors and using this feedback to identify deformation patterns, the system can accurately detect deformed banknotes and prevent operational errors, improving both measurement precision and reliability.
Data Source
AI summary
The present invention relates to an apparatus for detecting a skew of banknotes in an automated teller machine (ATM), and particularly, to an apparatus for detecting a skew of banknotes in an ATM capable of more effectively and accurately detecting a defective conveying state of the banknotes passing through a conveying route by including sensors on the conveying route, where the banknotes put into the ATM are conveyed, at regular intervals from each other along a direction crossing the conveying route and detect tips of the banknotes passing through the conveying route to separately detect skew angles for each sector of the banknotes passing through the conveying route based on banknote tip detection signals detected from each detection sensor and support detection of various types of skews of the banknotes, including one-way skew of the banknotes and V-shaped skew at both ends inclined in different directions.