Infrared Bio-Signal Measurement via Multi-Spectral Imaging
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Solution Overview
Problem
Existing non-contact bio-signal measurement systems are limited in accurately measuring multiple bio-signals simultaneously due to noise sensitivity, inaccuracy, and loss of feature points, especially in environments with varying lighting conditions, and struggle to measure blood pressure without physical contact.
Innovation Solution
A perfusion imaging-based non-contact autonomic nervous system response multi-dimensional bio-signal measurement system utilizing a light source that emits light outside the visible spectrum, a multi-dimensional multi-spectral camera to capture amplified reflected light, and a measurement diagnosis part for image processing to measure heart rate, oxygen saturation, blood flow, and blood pressure without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a regular camera is used to measure multiple bio-signals within the field of view, then the system can capture images in visible light region, but the measurement becomes noise-sensitive and inaccurate
Solution Approach 1:
The patent changes the wavelength parameter of light from visible region to infrared region. The infrared light source emits light at wavelengths outside the visible spectrum, and the infrared camera captures reflected infrared light, thereby avoiding visible light noise while enabling accurate non-contact measurement of multiple bio-signals including heart rate, oxygen saturation, and blood pressure
2Measurement precision
If channel separation method is used to measure oxygen saturation in visible light region, then oxygen saturation can be measured using light absorption difference, but the small absorption difference requires amplification process that reduces accuracy
Solution Approach 1:
The patent changes the measurement wavelength from visible light to infrared light. By using infrared wavelengths, the system exploits larger differences in light absorption between oxidized and deoxygenated hemoglobin in the infrared region, eliminating the need for noisy amplification processes while directly capturing accurate oxygen saturation measurements
3Measurement precision
If blood pressure is measured using PTT method requiring pulse measurement in two areas, then blood pressure can be estimated from pulse travel time, but the system requires partial contact to solve feature point loss
Solution Approach 1:
The patent transitions from one-dimensional point measurement to two-dimensional area measurement using infrared imaging. By capturing infrared images of a larger skin area, the system identifies multiple feature points within the field of view, enabling complete non-contact PTT-based blood pressure measurement without requiring partial contact
Solution Approach 2:
The infrared camera system performs multiple functions simultaneously: it measures heart rate, oxygen saturation, and blood pressure all through non-contact infrared imaging, eliminating the need for separate measurement systems or contact requirements
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 system enhances the accuracy and efficiency of bio-signal measurement by reducing visible light noise and enabling early diagnosis of complex lesions through multi-dimensional bio-signal analysis, with improved measurement accuracy for heart rate, oxygen saturation, and blood pressure.
Implementation Method 1
a light source configured to emit light outside a visible light region
Implementation Method 2
a multi-dimensional multi-spectral camera configured to photograph amplified reflected light reflected after emitted from the light source
Data Source
AI summary
Proposed are a perfusion imaging-based non-contact autonomic nervous system response multi-dimensional bio-signal measurement system and method, the system including a light source, a multi-dimensional multi-spectral camera, and a measurement diagnosis part. The light source is configured to emit light outside a visible light region, for measuring a multi-dimensional bio-signal in a non-contact manner. The multi-dimensional multi-spectral camera is configured to photograph amplified reflected light reflected after emitted from the light source, and generate an image sequence of the bio-signal accordingly. The measurement diagnosis part is configured to measure heart rate, oxygen saturation, blood flow per second, and blood pressure through image processing of the image sequence of the bio-signal generated from photographing by the multi-dimensional multi-spectral camera.