Banknote Serial Number Recognition with Digit Shift Correction
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Solution Overview
Problem
Conventional methods for character recognition of identification numbers on paper sheets, such as banknotes, fail to accurately manage and search for serial numbers due to digit shifts caused by staining or scribbling, leading to inefficient database utilization and incorrect registration and retrieval of serial numbers.
Innovation Solution
A paper-sheet management method and system that performs character recognition, allocates error characters for unrecognizable digits, calculates matching ratios, shifts characters to account for potential digit shifts, and corrects serial numbers based on these ratios to ensure accurate registration and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If character recognition is performed on stained or scribbled banknotes, then automatic registration of serial numbers is achieved, but digit shift occurs causing incorrect registration
Solution Approach 1:
The system performs preliminary character recognition on the banknote image, then compares the recognized serial number with the actual serial number printed on the banknote. If a digit shift is detected, the system automatically corrects the recognized serial number by shifting digits in the opposite direction before registration. This preliminary detection and correction action prevents incorrect registration while maintaining automation.
Solution Approach 2:
The system uses feedback from comparing the recognized serial number with the actual serial number to detect digit shifts. When a discrepancy is found, the system adjusts the recognized serial number based on the feedback information about the direction and magnitude of the shift, ensuring accurate registration while maintaining automatic processing.
2Ease of operation
If error characters are allocated to unrecognizable digits, then user work burden is reduced, but digit shift cannot be detected
Solution Approach 1:
The system performs character recognition and allocates error characters to unrecognizable digits as a preliminary action. Then, it compares the recognized serial number with the actual serial number to detect digit shifts. This allows the system to maintain ease of operation by automatically handling unrecognizable characters while still being able to detect and correct digit shifts through the subsequent comparison and correction process.
3Adaptability or versatility
If serial numbers with digit shift are registered in the database, then all banknotes can be registered, but search efficiency decreases
Solution Approach 1:
The system performs preliminary detection of digit shifts by comparing the recognized serial number with the actual serial number before registration. When a digit shift is detected, the system automatically corrects the recognized serial number by shifting digits in the opposite direction. This preliminary correction ensures that only accurately registered serial numbers are stored in the database, maintaining high search efficiency while preserving the ability to register all banknotes.
Solution Approach 2:
The system converts the harmful effect of digit shift into a beneficial correction process. By detecting the digit shift through comparison with the actual serial number, the system automatically corrects the recognized serial number before registration. This transforms the error into an opportunity for automatic correction, ensuring database accuracy while maintaining comprehensive registration capability.
Data Source
AI summary
A first identification number obtained by performing character recognition of each of a plurality of digits of an identification number and allocating predetermined characters to digits where characters cannot be determined and a second identification number representing an identification number that is the target of character recognition processing or search processing are compared with each other by calculating a matching ratio between the two numbers. When the matching ratio is lower than a predetermined reference value, a shifted identification number obtained by shifting each character forming the first identification number one digit in a predetermined direction and the second identification number are compared with each other by calculating a matching ratio between the two numbers. If this matching ratio is equal to or higher than the predetermined reference value, subsequent processing is continued, so that the shifted identification number is treated as the first identification number.