Moire Parallax Authentication via Correlated S-Random Layers
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Solution Overview
Problem
Current anti-counterfeiting methods using moire effects are vulnerable to simulation and lack dynamic visual effects, as they rely on fixed latent images or repetitive patterns, making them easily replicable and lacking in security against skilled counterfeiters.
Innovation Solution
The introduction of a compound layer with a base layer and a revealing layer, both comprising s-random elements correlated in location, which generates a dynamically moving single moire shape instance when tilted, providing enhanced security through a built-in encryption system and sensitivity to microscopic variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase modulation methods with latent images are used, then authentication capability is provided, but the method is simple to simulate and counterfeit
Solution Approach 1:
The patent transforms static latent images into dynamic moire patterns that change with viewing angle. The base layer and revealing layer are designed with specific geometric transformations (rotation, scaling, shearing) so that the moire pattern dynamically scrolls, rotates, or changes shape when the document is tilted, making counterfeiting extremely difficult while maintaining authentication capability
Solution Approach 2:
The patent applies geometric transformations to the base layer elements (rotation, scaling, shearing, distortion) to create moire patterns with specific dynamic characteristics. By controlling parameters such as transformation angles, scaling factors, and element distributions, the system generates unique moire behaviors that are easy to authenticate but hard to replicate
2Ease of operation
If fixed latent images are used for authentication, then the authentication method is simple, but dynamic visual effects such as scrolling, magnification, and rotation are not provided
Solution Approach 1:
The patent introduces dynamic visual effects by designing the base layer and revealing layer with geometric transformations. When the document is tilted or viewed from different angles, the moire patterns dynamically scroll, rotate, magnify, or change shape, providing engaging visual effects while maintaining simple authentication through observation of these dynamic behaviors
3Ease of manufacture
If periodic structures are used for moire effects, then the patterns are repetitive and predictable, but the encryption strength is reduced
Solution Approach 1:
The patent introduces asymmetry and aperiodicity into the base layer element distributions while maintaining controlled geometric relationships. By using non-uniform spacing, varied element shapes, and irregular patterns combined with geometric transformations, the system creates moire patterns that are unique and difficult to predict, significantly enhancing encryption strength while remaining manufacturable
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 significantly increases the difficulty of counterfeiting by creating a dynamic, recognizable moire effect that is hard to replicate, offering robust authentication and distinguishing real documents from counterfeits.
Implementation Method 1
authentication methods and devices which are based on the parallax effects that occur in the cases of 1D random moire or 2D random moire
Implementation Method 2
authentication methods and devices which are based on the parallax effects that occur in the cases of 1D random moire or 2D random moire
Data Source
AI summary
This invention discloses new methods and security devices for authenticating documents and valuable products which may be applied to any support, including transparent synthetic materials and traditional opaque materials such as paper. The invention relates to parallax moire shapes which occur in a compound layer consisting of the superposition of specially designed and possibly geometrically transformed s-random base layer and s-random revealing layer with a small gap between them. The base and revealing layers are formed respectively by base layer element shapes and revealing layer sampling elements positioned at s-random locations, where the base layer locations and the revealing layer locations are strongly correlated. When tilting the compound layer or changing the viewing angle, a parallax moire intensity profile of a chosen shape is seen moving in the superposition, thereby allowing the authentication of the document. A major advantage of the present invention is in its intrinsically incorporated encryption system due to the arbitrary choice of the s-random number sequences used for defining the positions of the specially designed base layer element shapes and revealing layer sampling elements that are used in this invention.