QR Code Pixel Luminance Optimization for Biometric Embedding
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Solution Overview
Problem
Existing methods for embedding graphic representations and concealed messages into QR codes often result in significant visual distortion and high decoding errors, particularly when incorporating biometric data, which complicates the integration and retrieval of such information.
Innovation Solution
The technique modifies the color or luminance of QR code pixels using an optimization method to minimize visual distortion while maintaining a predetermined decoding error probability, employing cryptographic methods for encryption and spectral weighting masks to embed biometric data like fingerprints, iris imagery, and portraits within QR codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If graphic representations and concealed messages are embedded into QR codes using existing methods, then information capacity is increased, but visual distortion increases and decoding error probability increases
Solution Approach 1:
The patent applies parameter changes by modifying the luminance values of QR code pixels within specific ranges while maintaining the underlying code structure. The optimization method adjusts luminance parameters to minimize visual distortion and decoding errors while embedding additional information, thereby resolving the contradiction between increasing information capacity and maintaining decoding reliability
Solution Approach 2:
The patent employs preliminary action through optimization methods that pre-calculate and pre-adjust the luminance values before final embedding. By performing optimization in advance to minimize visual distortion and ensure decoding accuracy, the system prepares the QR code structure to accommodate additional information without compromising reliability
2Loss of information
If graphic representations and concealed messages are embedded into QR codes using existing methods, then information capacity is increased, but visual distortion increases
Solution Approach 1:
The patent modifies luminance parameters of pixels within acceptable ranges to embed information while maintaining visual fidelity. By carefully controlling luminance changes and using optimization to minimize distortion, the system increases information capacity without significantly degrading the visual appearance of the QR code
Solution Approach 2:
The patent applies local quality by allowing different luminance modifications in different regions of the QR code based on local characteristics. The optimization method adjusts luminance values locally to minimize visual distortion in each region while still embedding the required information, thereby resolving the contradiction between information capacity and visual quality
3Adaptability or versatility
If biometric data is embedded into QR codes, then data security and functionality are enhanced, but integration complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional embedding system that can handle various types of data (standard information, concealed messages, and biometric data) using a unified optimization-based approach. This universal method reduces integration complexity by providing a consistent framework for embedding different data types while enhancing functionality
Data Source
AI summary
The present invention embodies a technique to embed a graphic representation and/or a concealed message such as but not limited to two dimensional codes such as quick response (QR) code matrices, fingerprints, coded fingerprint representations, iris imagery, iris coded representation, biometric hashes, palm print or portraits into a QR matrix code. In the case where biometric data such as finger print representation, iris coded representation or biometric hashes are encoded into the embedding, suitable binary representation of those patterns are generated before encoding. These concealed messages can be further encrypted using any cryptographic method such as public or private key or other suitable encrypting mechanisms adapted to the concealed message. For an implementation of the present invention in which a graphic representation is embedded into the code, the embedding process is based on an optimization method by which the color or luminance of the embedding is modified so as to minimize the visual distortion with respect to a reference image while maintaining the probability of decoding error of the standard and concealed code under a predetermined limit.