Automated LetterScreen Verification Using Wave Structure Microtext
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Solution Overview
Problem
The original LetterScreen system for verifying high security documents is inefficient due to the slow and tedious process of comparing text in the LetterScreen with personal data, requiring special magnifiers and not being easily automatable.
Innovation Solution
The enhanced system uses a unique microtext wave structure generated based on personal data from the Machine Readable Zone (MRZ) of the document, allowing for automated verification by regenerating the wave structure and comparing it with the scanned document, using common devices like smartphones or laptops to quickly determine authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If text comparison verification method is used, then document authenticity can be verified, but verification process becomes slow and tedious requiring special magnifiers
Solution Approach 1:
The patent replaces the manual mechanical verification process (using magnifiers to examine microtext) with an automated optical recognition system. The system uses image capture devices and pattern recognition algorithms to automatically detect and compare the LetterScreen microtext patterns, eliminating the need for manual inspection with magnifiers and significantly reducing verification time while maintaining reliability.
Solution Approach 2:
The patent creates a digital copy of the LetterScreen microtext pattern through image capture and stores it for automated comparison. Instead of requiring physical examination with magnifiers, the system captures an image of the microtext, processes it digitally, and compares it with stored reference patterns, enabling rapid automated verification without losing authentication accuracy.
2Measurement precision
If special magnifiers are used for verification, then text comparison can be performed, but device complexity increases and automation becomes difficult
Solution Approach 1:
The patent replaces complex mechanical magnification devices with a simplified optical imaging system combined with digital image processing. Instead of requiring physical magnifiers with specific optical properties, the system uses standard image capture devices to photograph the microtext and employs software algorithms to enhance and analyze the patterns, reducing hardware complexity while maintaining measurement precision.
Solution Approach 2:
The patent transitions from two-dimensional physical examination (viewing microtext through magnifiers) to a three-dimensional approach by capturing the microtext as a digital image that can be processed, enhanced, and analyzed computationally. This allows the system to examine the microtext patterns from multiple processing dimensions (brightness, contrast, pattern recognition) without requiring complex physical magnification equipment.
3Ease of manufacture
If straight horizontal text lines are used, then LetterScreen can be created, but security is reduced compared to waved text lines
Solution Approach 1:
The patent applies curved or waved patterns to the text lines in the LetterScreen microtext, transforming straight horizontal lines into sinusoidal or irregular curved paths. This curvature increases the complexity of reproducing the pattern accurately, thereby enhancing security against counterfeiting while still allowing automated optical systems to detect and verify the patterns through image processing.
Data Source
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AI summary
A method and system for generating a document for use with a personal identifier, personal data and an image, comprising : inputting the personal identifier into a processor; inputting the personal text data into the processor; inputting the image into the processor; generating, by the processor, a first Message Authentication Code (MAC) based on the personal identifier; generating, by the processor, a first wave structure based on the MAC; generating, by the processor, waved microtext based on the wave structure and the personal text data; generating, by the processor, a letter screen image from the input image with the waved microtext; and outputting the letter screen image. A method and system for verification of the generated document is also disclosed.