1D Guilloche Pattern Encoding for ID Document Security
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Solution Overview
Problem
Existing methods for securing identification documents using guilloche patterns and watermarking techniques face challenges in visual perception and readability, particularly with 2D guilloche patterns that hinder the visibility of underlying content, limiting level 1 and 2 security checks, and are sensitive to document deterioration.
Innovation Solution
A method for generating 1D guilloche patterns that encode alphanumeric data using formatted data blocks and carrier functions, modulated to ensure visual acceptability and security, with local or global interpolation and spread spectrum approaches, allowing for secure encoding without disrupting the document's readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2D guilloche patterns are used to encode alphanumeric data, then data security is improved, but visual perception and readability of the photograph are deteriorated
Solution Approach 1:
The patent segments the guilloche pattern encoding into two distinct dimensions: a first dimension (e.g., horizontal lines) and a second dimension (e.g., vertical lines). The alphanumeric data is encoded through the interaction of these two dimensions, where each character is represented by the intersection or relationship between lines from both dimensions. This segmentation allows the pattern to encode complete data while maintaining visual acceptability, as each individual dimension appears less intrusive than a complete 2D pattern would.
Solution Approach 2:
The patent applies different visual properties to different parts of the guilloche pattern. Specifically, the first and second dimensions may have different line densities, spacing, or visual weights. This local differentiation optimizes the balance between encoding capacity and visual perception, allowing certain regions to carry more encoding information while other regions maintain better visual clarity for the underlying photograph.
2Extent of automation
If watermarking techniques are used to protect alphanumeric data, then automatic verification capability is improved, but visual check capability (level 1 and 2 security) is lost
Solution Approach 1:
The patent merges two previously separate security approaches into a single integrated solution: the visual guilloche patterns (providing level 1 and 2 security) and the embedded data encoding (providing automatic verification capability). The same guilloche pattern structure serves dual purposes: it is visually perceivable for manual inspection while simultaneously encoding alphanumeric data that can be automatically read by optical devices. This merging eliminates the need to choose between automated verification and visual check capability.
3Reliability
If guilloche lines are made closer together and/or thicker to increase data encoding capacity, then data security is improved, but visual perception of the photograph is further deteriorated
Solution Approach 1:
The patent transitions from encoding data within a single two-dimensional plane (where increasing line density directly reduces photograph visibility) to utilizing two independent dimensions (first and second dimensions) that interact to encode data. This dimensional approach allows the system to encode alphanumeric information through the relationship between dimensions rather than through increased line density within a single plane, thereby maintaining photograph visibility while achieving data security.
Data Source
AI summary
Generation of one dimensional guilloche patterns able to be affixed on a document, each guilloche pattern being able to encode variable alphanumeric data providing a different appearance to each guilloche pattern, by formatting alphanumeric data to be encoded in the form of a predefined number of data blocks with a predefined size, generating a carrier function having a plurality of parameters, the formatted data blocks forming at least one of the parameters, and modulating the carrier function by the formatted data blocks so as to encode the alphanumeric data graphically, each data block defining a guilloche pattern, the number of data blocks defining the number of guilloche patterns, the carrier function associated with a formatted data block is modulated locally, each datum of the block being encoded locally in the guilloche pattern, by interpolation of a predefined point associated with the carrier function.