Value Document Testing With Wavelength-Specific Line Illumination
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Solution Overview
Problem
Conventional methods for testing valuable documents, such as banknotes and identity cards, require high-resolution images and significant storage and computing power for authenticity and fitness tests, making them complex and resource-intensive.
Innovation Solution
Illuminating valuable documents line by line with alternating wavelengths of light, processing the reflected or transmitted light data to generate images with different resolutions, and comparing these images with reference images to test specific features, allowing for lower resolution processing and reduced computing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution images are used for testing valuable documents, then measurement precision is improved, but device complexity and computing power requirements increase
Solution Approach 1:
The document is divided into multiple line groups that are illuminated and processed separately. Each line group can be processed at different resolutions depending on the specific testing requirements, allowing high resolution where needed and lower resolution where sufficient, thereby reducing overall computing power requirements while maintaining necessary measurement precision.
Solution Approach 2:
Different line groups are processed with different image resolutions according to their specific testing requirements. Some line groups may require high resolution for authenticity feature detection, while others can be processed at lower resolution for fitness testing, optimizing the balance between measurement precision and device complexity.
2Measurement precision
If high-resolution images are stored for authenticity testing, then measurement precision is improved, but storage space requirements increase
Solution Approach 1:
Instead of storing one large high-resolution image of the entire document, the system processes and stores multiple smaller image segments corresponding to different line groups. Each segment can be stored at the resolution needed for its specific purpose, significantly reducing total storage space requirements while maintaining the necessary measurement precision for authenticity testing.
Solution Approach 2:
Different line groups are stored at different resolutions based on their specific requirements. High-resolution images are stored only for line groups requiring detailed authenticity feature analysis, while lower-resolution images are stored for line groups used for fitness testing, optimizing the balance between measurement precision and storage space.
3Productivity
If multiple authenticity features are tested simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
The illumination system can illuminate different line groups with different wavelengths of light, and the detector can detect reflection light, transmission light, or both. This multi-functional capability allows a single device to test multiple authenticity features and fitness characteristics without requiring separate dedicated systems for each feature type, thereby improving productivity while controlling device complexity.
Solution Approach 2:
The system can sequentially illuminate different line groups with different wavelengths and detect different types of light (reflection, transmission, or both) in a periodic manner. This allows multiple authenticity features and fitness tests to be performed using the same hardware components in sequence, improving productivity without increasing device 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
This approach simplifies the testing process by using images with minimum required resolutions for each feature, reducing computational demands and enabling simpler device implementation.
Implementation Method 1
the valuable document is illuminated line by line in such a way that a first group of lines of the valuable document is illuminated with light of a first wavelength and that at least one second group of lines of the valuable document is illuminated with light of a second wavelength
Implementation Method 2
reflection light that is reflected from the lines and/or transmission light that passes through the lines are/is detected
Data Source
AI summary
A method for testing a valuable document including illuminating the valuable document line by line such that a first group of lines is illuminated with light of a first wavelength and a second group of lines is illuminated with light of a second wavelength, reflection light that is reflected from the lines and/or transmission light that passes through the lines. First data are representative of the reflection light and/or transmission light assigned to the lines of the first group and second data are representative of the reflection light and/or transmission light assigned to the lines of the second group. Further, processing the first data such that a first image generated from the first data has a first resolution, and the second data such that a further image generated from the second data has a second resolution, comparing the first and second images with first and further reference images.