Data Bearing Pattern Anti-Counterfeiting via Spatial Frequency Segmentation
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Solution Overview
Problem
Information bearing devices are vulnerable to unauthorized copying and misuse due to advancements in image capture technologies, as existing solutions do not effectively differentiate between legitimate and copied images, especially when captured by low-fidelity devices or under hand-tremor distortion.
Innovation Solution
The information bearing device employs a data bearing pattern with spatially distributed frequency data elements, featuring a first group at a characteristic frequency of 150LPI and a second group at a higher frequency up to 1000LPI, allowing detection of copying by distinguishing between different image capture apparatuses and mitigating hand-tremor distortion through strategic angular orientation and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If information bearing patterns are used with staple image reproduction apparatus, then ease of operation is improved, but measurement precision deteriorates because copying detection is not effective
Solution Approach 1:
The data bearing pattern is segmented into multiple frequency groups (first group at or above 150LPI, second group above the first frequency), where each group serves a specific detection purpose. This segmentation allows the system to detect different types of copying operations by analyzing responses at different frequency levels.
Solution Approach 2:
The patent transitions from spatial domain patterns to frequency domain analysis by distributing data defining elements to correspond to spatial frequency data. This dimensional change enables the detection of copying operations that are imperceptible in the spatial domain by examining frequency spectrum characteristics.
2Measurement precision
If high frequency data elements are added to detect copying, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The data bearing pattern serves multiple functions simultaneously: it encodes information for legitimate reading, enables copying detection through frequency analysis, and provides apparatus identification. The same frequency distribution structure supports all these functions without requiring separate systems.
Solution Approach 2:
The patent changes the frequency domain parameters of the data bearing pattern by introducing specific frequency groups (first group at or above 150LPI, second group above the first frequency). This parameter change enables copying detection capability while maintaining compatibility with existing image capture and processing systems.
3Measurement precision
If frequency data elements are distributed to correspond to spatial frequency data, then measurement precision is improved for copying detection, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent introduces frequency domain analysis as an intermediary step between capturing an image of the data bearing pattern and detecting copying. By transforming the detection process to the frequency domain, the system can identify copying artifacts that are not apparent in the spatial domain while using standard image capture equipment.
Data Source
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Figure 1C~1D
Figure 2~2A
AI summary
An information bearing device comprising a data bearing pattern, wherein the data bearing pattern comprises a plurality of data defining elements, the data defining elements being spatially distributed to define a set of spatial frequency data, and the set of spatial frequency data comprising a plurality of frequency data elements (F1, F2,…, Fn); and wherein each frequency data (Fi) has a data frequency magnitude (fi) and a data frequency angle (θi), the data frequency magnitude being above a first characteristic spatial frequency (fA) which corresponds to a characteristic frequency of a staple or commonplace image reproduction apparatus, the characteristic frequency representing an image data frequency above which reproduction quality by the staple or commonplace image reproduction apparatus begins to drop substantially.