Paper Sheet Recognition Using Optical Resolution Magnetic Templates
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Solution Overview
Problem
Conventional paper-sheet recognition apparatuses face challenges in reducing the number of magnetic templates and accurately specifying evaluation target areas due to the need for numerous templates to account for skew and positional shifts, leading to increased memory requirements and labor, especially with lower magnetic sensor resolution.
Innovation Solution
A paper-sheet recognition apparatus utilizing an optical line sensor and a magnetic line sensor, where magnetic templates are defined at optical resolution, allowing for rotation correction based on skew and positional shift data from the optical sensor, reducing the need for multiple templates and improving accuracy by comparing rotation-corrected magnetic templates with magnetic data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic templates are prepared to account for skew and positional shift, then recognition accuracy is improved, but memory capacity and labor for defining templates increase significantly
Solution Approach 1:
The patent combines multiple magnetic templates for different skew angles and positional shifts into a single unified template. By using optical sensor data to dynamically determine the actual skew and position, the system selects and applies the appropriate region from the unified template, eliminating the need to store and manage multiple separate templates while maintaining recognition accuracy.
Solution Approach 2:
The patent changes the approach from storing multiple fixed templates to storing a single template with variable parameter regions. The optical sensor measures actual skew angle and positional shift, and these parameter values are used to select and adjust the evaluation target area within the unified magnetic template, allowing adaptive recognition without increasing template quantity.
2Ease of manufacture
If magnetic templates are defined at magnetic sensor resolution, then template definition is simpler, but evaluation target area specification becomes difficult due to lower resolution
Solution Approach 1:
The patent introduces optical sensor data as an intermediary between the magnetic template and the evaluation process. The high-resolution optical sensor accurately determines skew angle and positional shift, which then guide the selection of the evaluation target area in the magnetic template. This intermediary measurement allows precise area specification without requiring the magnetic template itself to be defined at high resolution.
Solution Approach 2:
The patent performs preliminary measurement of skew angle and positional shift using the optical sensor before conducting magnetic template matching. This preliminary action provides accurate positional information that enables precise specification of the evaluation target area in subsequent magnetic template processing, even though the magnetic template itself is defined at lower resolution.
3Measurement precision
If templates are prepared for respective banknote denominations and transport directions, then recognition accuracy is improved, but the number of templates and memory requirements increase
Solution Approach 1:
The patent makes the template selection dynamic by using optical sensor measurements of banknote denomination and transport direction to automatically select the appropriate evaluation target area from a unified magnetic template. Instead of statically storing separate templates for each denomination and direction, the system dynamically adjusts which region of the unified template to use based on real-time optical measurement, reducing template management complexity while maintaining accuracy.
Data Source
AI summary
A paper-sheet recognition apparatus recognizes a paper sheet, which is being transported, by using an optical line sensor and a magnetic line sensor. The paper-sheet recognition apparatus includes a memory unit that stores therein magnetic templates defined in advance for respective types and respective transport directions of paper sheets, wherein the magnetic templates are defined at optical resolution representing resolution of the optical line sensor; a selecting unit that selects a magnetic template based on a type and a transport direction of the paper sheet, the type and the transport direction being obtained by analyzing optical data acquired by the optical line sensor; and a comparing unit that divides magnetic data acquired by the magnetic line sensor into pieces of data each corresponding to the optical resolution, and compares the magnetic template selected by the selecting unit with the divided magnetic data.