Bill Authenticity Judgment Using Pixel Brightness Segmentation
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Solution Overview
Problem
The accuracy of bill authenticity judgment is reduced when bills are wet, as the change in surface condition affects the brightness of transmitted and reflected light data, leading to false identification of legitimate bills as forged.
Innovation Solution
A paper sheet processing apparatus that converts transmitted and reflected light into data with pixel-level brightness information, excluding a predetermined area from the judgment process if it shows a significant brightness difference, to prevent misidentification due to surface changes like wetness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmitted light data and reflected light data are used for bill authenticity judgment, then the judgment process can identify bill characteristics, but the accuracy is reduced when the bill surface is wet due to brightness changes
Solution Approach 1:
The bill surface is divided into multiple pixel regions, and the brightness of each region is independently analyzed. This segmentation allows the system to identify and exclude specific wet areas from the authenticity judgment, preventing localized brightness changes from affecting the overall judgment accuracy.
Solution Approach 2:
Different treatment is applied to different regions of the bill based on their brightness characteristics. Areas with abnormal brightness (indicating wetness) are identified and excluded from the authenticity judgment, while normal areas are used for judgment. This local quality approach ensures that only reliable regions contribute to the final authenticity determination.
2Measurement precision
If the entire bill surface is used for authenticity judgment, then comprehensive verification is achieved, but wet areas cause false identification of legitimate bills as forged
Solution Approach 1:
Wet areas exhibiting abnormal brightness characteristics are extracted and excluded from the authenticity judgment process. By removing these harmful regions from consideration, the system prevents false identification of legitimate bills as forged, while still utilizing the remaining normal areas for comprehensive verification.
Solution Approach 2:
The brightness change caused by wetness, which initially appears as a harmful factor, is converted into a useful indicator. By detecting abnormal brightness patterns, the system automatically identifies and excludes wet areas, transforming the harmful effect of wetness into a beneficial mechanism for improving judgment accuracy.
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
This approach enhances the accuracy of bill authenticity judgment by isolating areas with surface changes, reducing the likelihood of legitimate bills being incorrectly identified as forged and maintaining high accuracy even when bills are wet.
Implementation Method 1
a bill moving along the bill travelling route is irradiated with light, and the transmitted light and reflected light from the bill are detected by a light receiving sensor
Implementation Method 2
the transmitted light data and reflected light data from the conveyed bill are acquired, converted for example to brightness information
Data Source
AI summary
A paper sheet processing apparatus capable of preventing authentication accuracy from degrading even when a state change occurs due to attachment of water or the like. The paper sheet processing apparatus includes: a light receiving unit which receives transmitted and reflected lights from the paper sheet radiated by light emitting parts; a converter which converts the transmitted and reflected lights received by the light receiving part per pixel into data including color information having brightness; a RAM which stores transmitted and reflected light images received by the light receiving unit; an authenticity judgment processing part which determines the authenticity of the paper sheet based on the images stored in the RAM; and a determining part which excludes, based on a comparison result between brightness of the transmitted and reflected images in the predetermined area.