Security Device Grayscale Image Segmentation for Identity Documents
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Solution Overview
Problem
Current security devices for identity documents are vulnerable to counterfeiting and require a simpler yet more secure authentication method.
Innovation Solution
The method involves creating grayscale images representing color components of a digital color image, which are positioned contiguously or interlaced on a physical support, and can be viewed at different angles using a lens array, making the security feature difficult to reproduce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional printed security data is used on identity documents, then authentication is simple and visible, but the security device is vulnerable to counterfeiting
Solution Approach 1:
The patent divides the color image into multiple grayscale images corresponding to different color components (e.g., red, green, blue channels). Each grayscale image is printed separately on the security device, and special viewing tools (such as colored filters or digital processing software) are required to recompose the original color image. This segmentation makes counterfeiting difficult while maintaining simple authentication for legitimate users.
Solution Approach 2:
The patent transforms the color image into grayscale images by changing the color parameter representation. Each pixel's color information is converted to grayscale values that represent specific color components. This parameter transformation allows the security feature to be easily reproduced by authorized systems while being difficult to counterfeit without the proper decoding knowledge.
2Ease of operation
If multiple grayscale images are positioned at different locations on the physical medium, then authentication can be performed by simple image recomposition, but the device complexity increases
Solution Approach 1:
The patent positions multiple grayscale images in different spatial locations or layers on the physical medium. Instead of overlaying all images at the same position, they are distributed across different areas or depth layers. Special viewing tools or digital processing are required to properly align and recompose the images, adding a dimensional aspect to the authentication process that simplifies verification while maintaining security.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5
AI summary
The invention relates essentially to a method for manufacturing a security device, comprising the following steps: - obtaining (S310) at least a first, a second, a third and/or a fourth greyscale image from a color digital image: -- said first greyscale image comprising a plurality of pixels each presenting a greyscale level representing a first color component of the corresponding pixel of the color digital image, and -- said second greyscale image comprising a plurality of pixels each presenting a greyscale level representing a second color component of the corresponding pixel of the color digital image, - forming (S320) said at least a first and second greyscale images on a physical support of said security device.