ATM Cassette Cash Dispensing Error Detection via Image Processing
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Solution Overview
Problem
Existing ATM terminals lack the capability to detect errors in the internal dispensing process, such as discrepancies between the expected and actual cash dispensed, and incorrect loading or placement of currency denominations in cassettes, leading to inaccuracies in cash dispensation.
Innovation Solution
An image processing system is integrated into the ATM, utilizing cameras to capture images of dispensed bills and an image processing engine to determine the actual currency denominations and quantities, comparing them to the expected amounts, and generating alerts for any discrepancies, ensuring accurate dispensing and preventing incorrect cash distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing ATM terminals operate without image processing detection, then the device complexity is low, but the reliability of cash dispensing is insufficient due to inability to detect discrepancies between expected and actual cash
Solution Approach 1:
A camera is introduced as an intermediary device between the cassette and cash dispenser to capture images of dispensed cash. The camera acts as a mediator that provides visual data to the processor, enabling verification of cash dispensing without directly modifying the mechanical dispensing mechanism. This resolves the contradiction by adding a detection layer that improves reliability while maintaining the simplicity of the original dispensing system.
Solution Approach 2:
The patent replaces potential mechanical verification mechanisms with an optical imaging system. Instead of using mechanical sensors or physical verification mechanisms to check cash dispensing, the system uses a camera to capture images and processes these images to detect discrepancies. This substitution improves reliability through non-contact detection while avoiding the complexity of mechanical verification systems.
2Measurement precision
If no image processing system is used, then the ease of operation is maintained, but the measurement precision of dispensed cash denominations and quantities is insufficient
Solution Approach 1:
The system creates an optical copy (image) of the dispensed cash instead of directly measuring the physical cash. The camera captures a visual representation of the cash, and the processor analyzes this copy to determine denominations and quantities. This copying approach enables precise measurement of cash characteristics without direct physical contact, improving measurement precision while keeping the system relatively simple.
Solution Approach 2:
The patent substitutes mechanical or electrical sensing mechanisms with optical imaging to measure cash properties. Instead of using mechanical sensors to detect cash presence or electrical sensors to identify denominations, the system uses a camera to capture visual information and processes this information to determine both denomination and quantity with high precision.
3Reliability
If image processing detection is added to detect cassette errors, then the reliability of cash dispensing improves, but the loss of time increases due to additional image capture and processing steps
Solution Approach 1:
The camera captures images of dispensed cash during the dispensing process itself, rather than requiring separate verification steps after dispensing. This preliminary capture of visual data allows the system to verify cash accuracy as part of the normal dispensing operation, reducing the additional time cost. The image processing occurs concurrently with or immediately after dispensing, minimizing delays.
Solution Approach 2:
The image capture and processing function is integrated into the continuous dispensing operation rather than being a separate batch process. The camera continuously monitors cash dispensing, and the processor continuously analyzes images to verify accuracy. This continuous operation eliminates idle verification time and ensures that reliability checking is performed without interrupting the cash dispensing workflow.
Data Source
AI summary
A system is configured for detecting errors in an ATM. The system includes a processor that receives a withdrawal request from a user to receive cash from a cash dispenser of the ATM. Currency denominations and a number of bills for each currency denomination needed to fulfill the withdrawal request is determined. The system sends signal commands to cassettes of the ATM to dispense bills to fulfill the withdrawal request. A camera is positioned in a pathway of the bills being dispensed from the cassettes to the cash dispenser. The camera captures images of bills being dispensed from the cassettes and sends them to the processor. The processor generates an alert if a number of bills dispensed from at least one cassette does not match a corresponding number of bills expected to be dispensed from the at least one cassette.