Steganographic Benday Pattern Detection for Lottery Ticket Fraud
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Solution Overview
Problem
Existing scratch-off lottery tickets are vulnerable to illicit fraud through cut-and-paste alterations and photocopying, as conventional Benday patterns can be easily replicated using identical background patterns from losing tickets, defeating traditional countermeasures.
Innovation Solution
Implementing a steganographic Benday pattern in the background area of lottery tickets, which is undetectable to the human eye but becomes visible through digital image processing, allowing automated detection of fraudulent alterations and photocopies using an Electronic Validation Machine (EVM) or smartphone applications, enhanced by AI neural networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional Benday patterns are used in the background area, then the ticket can be easily manufactured and printed, but the pattern can be easily replicated by fraudsters using identical patterns from losing tickets
Solution Approach 1:
The patent applies local quality by making the Benday pattern properties location-dependent. Different regions of the ticket have Benday patterns with specific characteristics (frequency, orientation, density) that are unique to that location. This prevents fraudsters from simply copying patterns from one ticket to another, as the local pattern characteristics must match the authentic ticket's specific region.
Solution Approach 2:
The patent changes parameters of the Benday pattern including spatial frequency, orientation angles, and dot density based on location. These parameter variations create a complex pattern that is easy to print but difficult to replicate, as fraudsters would need to precisely match multiple varying parameters across different ticket regions.
2Object-affected harmful factors
If a Benday pattern is made visible to the human eye, then it can serve as a clear visual countermeasure, but it reduces contrast with the variable indicia and makes winning tickets harder to identify
Solution Approach 1:
The patent moves the Benday pattern detection from the visible dimension to the digital/image processing dimension. The pattern remains invisible or low-contrast to human eyes, maintaining good visual contrast for winning indicia, while being detectable through automated systems that analyze spatial frequency and other digital image parameters.
Solution Approach 2:
The patent replaces human visual inspection with automated digital image processing systems. Instead of relying on human eyes to detect the Benday pattern, the system uses computers to analyze spatial frequency characteristics, allowing the pattern to remain visually subtle while providing robust fraud detection capabilities.
3Ease of manufacture
If identical Benday patterns are used throughout a pack of tickets, then manufacturing is simplified, but cut-and-paste forgery becomes easier when donor tickets with matching patterns are available
Solution Approach 1:
The patent introduces asymmetry into the Benday pattern design by varying parameters such as spatial frequency, orientation, and dot density across different tickets and regions. This asymmetric variation maintains manufacturing feasibility while making forgery detection possible, as the asymmetric parameters can be verified against authentic ticket characteristics.
Data Source
AI summary
The present disclosure relates to systems, methods, and devices for automatically verifying the authenticity and integrity of documents such as but not limited to instant lottery tickets.