3D Document Body Reconstruction for Internal Manipulation Detection
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Solution Overview
Problem
Modern identification documents often have internal manipulations, such as altered personalization or facial images, which are difficult to detect as these changes are not visible on the surface, making it challenging to verify their authenticity.
Innovation Solution
A method involving the three-dimensional reconstruction of the document body using X-ray imaging and comparison with a reference image to detect internal changes, utilizing transmitted light sources like lasers or infrared light for transillumination and gradient-based reconstruction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface illumination methods (white light, UV-A, near-infrared) are used to verify document authenticity, then surface structures and visible features can be detected, but internal manipulations and traces within the document body remain undetected
Solution Approach 1:
The patent transitions from two-dimensional surface imaging to three-dimensional volumetric imaging by using transmitted light to penetrate the document body and capture internal structures. This dimensional change enables detection of internal manipulations that are invisible to surface illumination methods, resolving the contradiction between surface detection capability and internal manipulation detection.
Solution Approach 2:
The patent introduces transmitted light as an intermediary medium that penetrates the document body to reveal internal features. This intermediary approach allows indirect detection of internal manipulations through the light transmission properties of the document, overcoming the limitation of direct surface illumination.
2Reliability
If traditional document verification devices with surface illumination are used, then visible surface features can be verified, but the complexity increases when attempting to detect invisible internal manipulations
Solution Approach 1:
The patent makes the verification system universal by enabling a single transmitted light imaging system to detect both surface features and internal manipulations. This multi-functional capability improves reliability without proportionally increasing complexity, as one system performs multiple detection functions.
Solution Approach 2:
The patent changes the illumination parameters by using transmitted light instead of reflected light, and by varying light wavelengths (visible, UV-A, near-infrared). This parameter change enables the system to detect different types of features including internal manipulations, improving reliability while maintaining manageable system complexity.
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
Enables the detection of manipulations within the document body, such as cuts, glue traces, or inserted passport photos, thereby enhancing the ability to verify the authenticity of identification documents.
Implementation Method 1
shining a light through the document body to obtain a reflective image of the document body
Implementation Method 2
utilizing transmitted light sources like lasers or infrared light for transillumination
Implementation Method 3
simple light sources, such as a laser or infrared light sources, can be used to illuminate the document body
Implementation Method 4
infrared light sources, in particular at a wavelength of, for example, 900 nm
Data Source
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AI summary
The invention relates to a method for verifying the authenticity of an identification document comprising a document body, by (401) illuminating the document body with a luminaire to obtain a luminaire image of the document body, (403) generating a three-dimensional image of the document body from the luminaire image, and (405) comparing the three-dimensional image of the document body with a reference image to verify the authenticity of the identification document.