Bill Damage Detection Using Pixel Density Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing paper sheet processing apparatuses face conveyance failures due to damaged bills, such as folded or missing portions, which can cause bills to be stuck or incorrectly judged, leading to inefficiencies and errors in authentication and processing.
Innovation Solution
A paper sheet processing apparatus equipped with a damage determination mechanism that assesses the density values of pixels in the leading end area of the bill before reading, using multiple light sources to improve authenticity judgment accuracy and control the conveyance mechanism to prevent damaged bills from being conveyed further, thereby preventing conveyance failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pull-out prevention mechanism is installed in the bill traveling route, then the bill can be prevented from being drawn out toward the bill insertion slot, but a bill may be easily stuck on the portions which increases the likelihood of conveyance failure
Solution Approach 1:
The damage determination means performs preliminary detection of folded portions in the bill before the bill reaches the pull-out prevention mechanism. By identifying damage early in the conveyance process, the system can take preventive action (such as stopping conveyance or alerting the user) before the bill interacts with the pull-out prevention mechanism, thereby avoiding the sticking problem while maintaining security.
2Measurement precision
If the reading means reads the entire bill, then complete information is obtained for authenticity judgment, but the reading time increases and productivity decreases
Solution Approach 1:
The damage determination means performs preliminary detection of folded portions in the bill during the reading process, before complete reading is finished. This allows the system to identify damaged bills early and either reject them immediately or prioritize their processing, thereby reducing the overall processing time for the bill stream while maintaining accurate authenticity judgment for undamaged bills that require full reading.
Solution Approach 2:
The damage determination means focuses detection resources on specific critical areas of the bill (such as the leading end portion where folded portions most commonly occur) rather than uniformly processing the entire bill. This localized detection approach reduces the time required for damage identification while maintaining high accuracy in detecting the most problematic damage types.
3Measurement precision
If damaged bills are conveyed further after detection, then the authenticity judgment process can be completed, but conveyance failures occur due to folded portions hooking on mechanisms
Solution Approach 1:
The damage determination means detects folded portions in the bill before the bill reaches critical mechanisms such as the pull-out prevention mechanism and authenticity judgment components. Once damage is detected, the control means can immediately stop conveyance or redirect the damaged bill, preventing it from interacting with mechanisms that would cause sticking or conveyance failure. This preliminary detection and intervention approach ensures that damaged bills are handled separately, maintaining both conveyance reliability and the option to perform completeness checks if needed.
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
The apparatus effectively identifies and prevents damaged bills from being processed, reducing the likelihood of conveyance failures and improving the accuracy of authenticity judgments by determining damage before the bill reaches the pull-out prevention mechanism.
Implementation Method 1
a light receiving part (81a) which receives transmitted light and reflected light of the bill
Data Source
AI summary
A paper sheet processing apparatus capable of preventing conveyance failure. A bill processing apparatus includes a bill insertion slot, a bill conveyance mechanism capable of conveying the bill inserted from the bill insertion slot, a bill reader reading the conveyed bill, a converter which converts an image read by the bill reader into data for each pixel as a unit of a predetermined size including color information having brightness, an authenticity judging mechanism determining an authenticity based on a density value for each pixel converted by the converter and a density value for each pixel of a reference bill, a bill determination processing part for determining a damage of the bill, before the bill reader completes reading, and a controller controlling the conveyance of the bill based on a determination result by the bill determination processing part.