Biometric Device Optical Layer Diffraction Pattern Vein Recognition
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Solution Overview
Problem
Current biometric devices for smart wearable devices face challenges with high power consumption and slow processing speeds due to large vein image data, making them unsuitable for efficient identity recognition.
Innovation Solution
A biometric device with an optical layer and infrared light emitting diodes (IR LEDs) is designed to reduce data volume and processing time, featuring a diffraction pattern and planar light source to decrease power consumption and increase processing speed, and a method of sequentially lighting IR LEDs to accelerate image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional image capture is used for vein recognition, then recognition accuracy is maintained, but power consumption increases and processing speed decreases
Solution Approach 1:
The patent divides the image capture process into multiple stages: first capturing a low-resolution guide image to identify vein regions, then capturing high-resolution images only at those specific regions. This segmentation of the imaging process reduces the total data volume processed while maintaining recognition accuracy, thereby decreasing power consumption and improving processing speed.
Solution Approach 2:
The patent applies partial action by capturing images only at specific regions of interest (vein areas) rather than the entire field of view. The guide image is used to identify these critical regions, and subsequent high-resolution captures are performed only at those locations, reducing overall data processing requirements and energy consumption while maintaining sufficient recognition accuracy.
2Measurement precision
If high-resolution vein images are captured, then recognition accuracy is improved, but data amount increases and processing time increases
Solution Approach 1:
The imaging process is segmented into two phases: first, a low-resolution guide image is captured to identify vein region locations; second, high-resolution images are captured only at the identified vein regions. This segmentation ensures that high-resolution data is collected only where necessary, maintaining recognition accuracy while minimizing overall processing time and data volume.
Solution Approach 2:
The patent uses partial action by capturing high-resolution images only at specific vein regions rather than the entire field of view. The guide image identifies the critical regions, and subsequent captures are performed partially only at those locations, reducing total data amount and processing time while maintaining sufficient accuracy for recognition.
3Length of moving object
If conventional optical modules are used, then image quality is maintained, but device thickness increases
Solution Approach 1:
The patent merges the guide image capture function and the high-resolution image capture function into a single integrated optical system. The same optical components (lens, image sensor) are used for both the low-resolution guide image and the high-resolution vein region images, eliminating the need for separate optical modules and reducing overall device thickness while maintaining image quality.
Solution Approach 2:
The optical system is designed with multi-functionality, where the same optical components serve dual purposes: capturing the low-resolution guide image to identify vein regions and capturing high-resolution images at those regions. This universal optical system reduces the number of separate components needed, thereby reducing device thickness while maintaining the required image quality for accurate vein recognition.
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 solution achieves a thinner, more efficient biometric device with reduced power consumption and faster processing speeds, enabling quick recognition results suitable for smart wearable devices.
Implementation Method 1
The optical layer is disposed on the image sensor and includes a diffraction pattern. The IR LED is disposed on the diffraction pattern of the optical layer
Implementation Method 2
at least one infrared light emitting diode (IR LED)
Data Source
AI summary
A biometric device includes a substrate, an image sensor, an optical layer and at least one infrared light emitting diode (IR LED). The image sensor is disposed on the substrate. The optical layer is disposed on the image sensor and includes a diffraction pattern. The IR LED is disposed on the diffraction pattern of the optical layer. The optical layer is located between the IR LED and the image sensor.