Smartphone Authentication of Magnetically Induced Marks
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Solution Overview
Problem
Current smartphone-based authentication methods for magnetically induced marks are unreliable due to dependence on high-resolution printing, complex camera movements, and sensitivity to ambient light, making it difficult to accurately distinguish genuine marks from imitations.
Innovation Solution
A method using a smartphone with a light source and imager to capture digital images of magnetically induced marks at varying angles, calculating and comparing reflected light intensity curves to determine authenticity, while minimizing the impact of ambient light with flash illumination and precise positioning guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If smartphone-based authentication methods use high-resolution printing and complex camera movements to detect magnetically induced marks, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent replaces complex mechanical camera movements with a stationary imaging system that uses optical fields (light sources at multiple angles) to capture mark characteristics. Instead of moving the camera to obtain angular information, the system uses multiple light sources positioned at different angles to illuminate the mark simultaneously, eliminating mechanical complexity while maintaining measurement precision
Solution Approach 2:
The patent pre-positions multiple light sources at specific angles relative to the substrate before authentication occurs. This preliminary arrangement of light sources eliminates the need for complex camera movements during authentication, as all necessary angular information is captured in a single static image through the pre-configured illumination geometry
2Ease of operation
If ambient light conditions are allowed to vary during authentication, then ease of operation is improved, but reliability deteriorates due to light interference
Solution Approach 1:
The patent applies preliminary anti-action by using polarized light sources and polarizing filters positioned in the optical path before ambient light can interfere with the measurement. The polarized illumination is configured to predominantly reflect off genuine magnetic marks while suppressing ambient light reflections, thereby preventing interference before it affects authentication reliability
Solution Approach 2:
The patent changes the polarization state parameter of the illumination light to distinguish genuine marks from ambient light reflections. By using polarized light at specific angles and analyzing the polarization characteristics of reflected light, the system can differentiate between mark-induced reflections and ambient light interference, maintaining reliability under varying ambient conditions
3Reliability
If magnetically induced marks use magnetic pigment particles for security features, then resistance to counterfeit is improved, but difficulty in detection by consumers deteriorates
Solution Approach 1:
The patent introduces a smartphone-based intermediary system that bridges the gap between the magnetic mark (invisible to consumers) and the consumer's detection capability. The smartphone with integrated light sources and imaging sensor acts as a mediator that captures optical reflections from the magnetic mark and processes this information to provide authentication feedback, making the detection process easy for consumers while maintaining high counterfeit resistance
Solution Approach 2:
The patent replaces the need for specialized magnetic detection equipment with a smartphone-based optical detection system. Instead of requiring consumers to use magnetic sensors or specialized tools, the system uses the smartphone's camera and light sources to capture optical reflections that reveal magnetic mark characteristics, substituting complex mechanical/magnetic detection with simple optical measurement
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 provides robust, accurate, and reliable authentication of magnetically induced marks, immune to ambient light variations and complex camera movements, effectively differentiating genuine marks from imitations with high precision.
Implementation Method 1
illuminating the zone of the mark with the light source and taking a plurality of digital images of the illuminated zone with the imager being for each different digital image at a corresponding distinct viewing angle θ with respect to said zone
Implementation Method 2
magnetically induced marks, designs and/or patterns through the application of a corresponding magnetic field, causing a local orientation of the magnetic or magnetizable pigment particles in the unhardened coating
Implementation Method 3
Coatings or layers comprising oriented magnetic or magnetizable pigment particles
Data Source
AI summary
The invention relates to a method of authenticating a magnetically induced mark applied on a substrate including magnetically oriented partially reflective platelet-shaped magnetic or magnetizable pigment particles, with a portable device equipped with a light source operable to deliver visible light, an imager, a processor and a memory, the method comprising calculating, with the processor, a corresponding average intensity I of the light reflected by the partially reflective platelet-shaped magnetic or magnetizable pigment particles and collected by the imager at corresponding viewing angle θ, storing the calculated average intensities of the reflected light and corresponding viewing angles to obtain a reflected light intensity curve I(θ), comparing the stored reflected light intensity curve I(θ) with a stored reference reflected light intensity curve Iref(θ) for said magnetically induced mark, and determining whether the magnetically induced mark is genuine based on a result of the comparison.