Hand Surface Biometric Sensor Using Sequential Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biometric data acquiring devices for hand surface data are complex and costly due to the need for multiple illumination configurations, which complicates the configuration of illumination units and increases manufacturing costs.
Innovation Solution
A biometric data acquiring device with a simplified configuration that uses a combination of hardware and software components, including an authentication sensor unit, hand region extracting unit, and surface data determining unit, to capture and process hand surface data using a single illumination source, focusing on hand shape and dark line characteristics for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple illumination configurations are used to acquire hand surface data, then the quality and quantity of surface data improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies periodic action by sequentially switching between different illumination sources (first illumination source and second illumination source) to capture images at different time points. This temporal sequencing allows multiple illumination configurations to be used without requiring all sources to be active simultaneously, thereby reducing device complexity while maintaining surface data quality.
Solution Approach 2:
The patent employs dynamics by making the illumination configuration adjustable and switchable rather than fixed. The control unit dynamically selects which illumination source to use based on the imaging requirements, allowing the system to adapt between different illumination modes (transmitted light, reflected light, oblique illumination) without requiring a permanently complex multi-source configuration.
2Measurement precision
If multiple illumination sources are used to capture hand surface data from different directions, then the surface data completeness improves, but the manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing illumination sources that can serve multiple functions. The first and second illumination sources can each perform multiple roles: providing transmitted light, reflected light, and oblique illumination depending on the optical path configuration. This multi-functionality allows complete surface data acquisition without requiring separate dedicated sources for each illumination type, thereby reducing manufacturing cost.
Solution Approach 2:
The patent merges the functionality of multiple illumination sources by combining transmitted light paths and reflected light paths within a single optical system. The control unit coordinates the combined output from multiple sources to achieve comprehensive surface coverage, allowing the system to acquire complete surface data while using fewer physical components than would be required if each function were completely separate.
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
The device effectively acquires and processes hand surface data with a reduced number of illumination sources, lowering manufacturing costs while maintaining accurate biometric authentication capabilities, utilizing hand shape and dark line characteristics for identification.
Implementation Method 1
an image captured by utilizing reflected light
Implementation Method 2
an image captured by utilizing transmitted beam
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An organism information acquisition device is provided with an imaging part which images a user' s hand opened and the user's hand bent to acquire a first image and a second image respectively; a dark line extraction part which extracts dark lines from the first image and the second image; a dark line element feature extraction part which extracts the darkness and width of the dark lines extracted by the dark line extraction part from the first image and the second image; and a surface information judgment part which extracts the dark lines being surface information relating to the hand on the basis of the darkness of the dark line in the first image, the deepness of the dark line in the second image, the width of the dark line in the first image, and the width of the dark line in the second image.