Fingerprint Sensor Pulse Wave Measurement Adaptation
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Solution Overview
Problem
Current methods for non-invasive blood pressure measurement, such as cuff-based and cuff-less techniques, face challenges in accuracy and user comfort, particularly in dynamic environments where finger position changes occur.
Innovation Solution
An apparatus and method utilizing a sensor to generate pixel data from a fingerprint image, acquiring a pulse wave signal by setting a region of interest based on feature points, and estimating amplitude values to guide user adjustments for optimal signal acquisition, incorporating light sources and detectors for precise bio-signal measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed sensor position is used for pulse wave measurement, then the device structure is simple, but the measurement accuracy deteriorates when finger position changes
Solution Approach 1:
The patent applies dynamics by making the sensor arrangement adaptable to different finger positions. Instead of a fixed sensor layout, the system dynamically determines optimal sensor positions based on detected fingerprint features, allowing the measurement configuration to change according to actual usage conditions while maintaining measurement accuracy
Solution Approach 2:
The patent changes the spatial parameters of the sensor arrangement based on fingerprint analysis. By extracting feature points from the fingerprint image and calculating optimal positions relative to these features, the system adjusts the sensor coordinates and arrangement to match the actual finger placement, thereby maintaining measurement precision across different positions
2Area of stationary object
If the entire fingerprint image area is used for pulse wave measurement, then the signal acquisition area is maximized, but the signal-to-noise ratio deteriorates due to inclusion of non-vascular regions
Solution Approach 1:
The patent applies local quality by differentiating between different regions of the fingerprint image and assigning different functions to each. The system identifies vascular regions through fingerprint feature analysis and selectively uses only those regions for pulse wave measurement, while excluding non-vascular areas, thereby improving signal quality without sacrificing necessary measurement area
Solution Approach 2:
The patent extracts the relevant vascular regions from the complete fingerprint image. By identifying feature points and determining regions of interest based on fingerprint patterns, the system separates and isolates the useful measurement areas containing blood vessels from the rest of the image, using only the extracted relevant portions for pulse wave signal acquisition
3Adaptability or versatility
If multiple sensors are arranged to cover all possible finger positions, then the measurement coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by first capturing a fingerprint image and analyzing its features before proceeding to sensor arrangement. This preliminary fingerprint-based positioning allows the system to determine the optimal sensor configuration for the actual finger placement, enabling accurate measurement with a smaller number of sensors positioned strategically based on pre-acquired fingerprint data
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 enables accurate and user-friendly non-invasive blood pressure measurement, providing bio-information like blood pressure, vascular age, and stress index, while adapting to changes in finger position, enhancing measurement reliability and comfort.
Implementation Method 1
a sensor configured to generate pixel data representing a fingerprint image of an object by detecting light scattered or reflected from the object
Implementation Method 2
a sensor configured to generate pixel data representing a fingerprint image of an object by detecting light scattered or reflected from the object
Implementation Method 3
one or more light emitting diodes (LEDs) or one or more laser diodes as a light source configured to emit the light to the object
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An apparatus for measuring a signal is provided. The apparatus for measuring a signal may include a sensor configured to generate pixel data representing a fingerprint image of an object by detecting light scattered or reflected from the object and a processor configured to acquire the fingerprint image of the object based on the pixel data and acquire a pulse wave signal based on the fingerprint image and the pixel data.