Biometric Identification Using Laser Speckle Bloodstream Mapping
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Solution Overview
Problem
Existing personal identification methods based on fingerprint ridge-and-recess patterns and venous patterns face reliability issues due to potential falsification and lack of integration with subcutaneous bloodstream data, and there is no method combining these for composite identification.
Innovation Solution
A method that measures subcutaneous bloodstream distribution using laser scattering to create a two-dimensional bloodstream map, which is then used to extract ridge-and-recess patterns from fingertips or palms, providing a reliable and accurate form of personal identification by comparing the patterns with pre-registered data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fingerprint ridge-and-recess patterns are used for personal identification, then identification can be carried out, but reliability is insufficient due to potential falsification
Solution Approach 1:
The patent combines multiple identification features (fingerprint ridge-and-recess patterns, venous patterns, and subcutaneous bloodstream patterns) into a composite identification system. By merging these different biometric features that are difficult to falsify simultaneously, the system achieves higher reliability and resistance to falsification compared to using any single feature alone.
Solution Approach 2:
The invention creates a composite biometric identification system that integrates multiple types of biological data (optical fingerprint patterns, infrared venous patterns, and laser speckle bloodstream patterns). This composite approach is analogous to using composite materials - combining different properties to achieve superior performance that individual components cannot provide alone, specifically in terms of anti-falsification capability.
2Ease of operation
If venous patterns are used for personal identification, then identification can be carried out without bloodstream, but reliability is insufficient due to ease of falsification
Solution Approach 1:
The patent merges venous pattern detection with subcutaneous bloodstream detection using laser speckle technology. By combining these two features that are physiologically linked and difficult to falsify simultaneously, the system maintains ease of operation while significantly improving reliability and resistance to falsification.
3Measurement precision
If subcutaneous bloodstream measurement is performed using laser scattering, then two-dimensional bloodstream map can be obtained, but integration with fingerprint patterns for identification has not been established
Solution Approach 1:
The patent merges subcutaneous bloodstream measurement (using laser speckle pattern analysis) with surface fingerprint ridge-and-recess pattern detection into a unified identification system. By integrating these measurement technologies that operate at different depths and use different physical principles, the system achieves comprehensive biometric identification while managing complexity through coordinated processing.
Solution Approach 2:
The invention adds a new dimension to fingerprint identification by incorporating subcutaneous bloodstream patterns (deeper tissue layer) alongside surface ridge-and-recess patterns. This multi-dimensional approach to biometric data collection enhances identification reliability by utilizing information from different spatial layers of the finger.
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 enhances identification reliability and accuracy by utilizing the unique modulation of bloodstream by ridge-and-recess patterns, making it difficult to falsify and allowing for composite personal identification.
Implementation Method 1
measuring subcutaneous bloodstream by irradiating a laser beam onto at least a part of a fingertip surface
Implementation Method 2
the intensity distribution of the reflected and scattering light dynamically changes due to moving scattering particles such as blood cells, and forms laser speckles
Implementation Method 3
receiving light reflected from subcutaneous blood vessel layers at an irradiation spot to which a laser beam is irradiated
Data Source
AI summary
The present invention provides a method for acquiring personal identification data by extracting a ridge-and-recess pattern corresponding to a fingerprint or a knuckle joint and lines on a palm by utilizing characteristics by which subcutaneous bloodstream distribution is spatially modulated by the ridge-and-recess pattern on the surface when measuring a subcutaneous bloodstream distribution based on a bloodstream measuring technology utilizing laser scattering, and by acquiring the same as personal identification data based on living body information, and the same method for acquiring personal identification data includes the steps of: irradiating a laser beam onto at least a part of a fingertip surface or a palm; imaging reflection light from subcutaneous blood vessel layers at an irradiation spot to which a laser beam is irradiated by receiving the same on an image sensor as laser speckles; calculating a change ratio of a light-receiving amount at respective pixels of the laser speckles; preparing a two-dimensional bloodstream map of the irradiation spot based on the numerical values obtained in the step of calculating a change ratio of a light-receiving amount; and storing a ridge-and-recess pattern of the irradiation spot appearing in the two-dimensional bloodstream map as personal identification data.