Biological State Detection Using Multi-Wavelength Imaging
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Solution Overview
Problem
Existing non-contact biological state detection methods, such as those using pulse wave detectors, provide limited information for comprehensive determination of a subject's biological state, failing to generate sufficient data for accurate assessment.
Innovation Solution
A biological state detecting apparatus and method utilizing two light sources of different wavelengths, alternately emitting light and capturing reflected images with a multi-element imaging device to generate enhanced biological information, including distance images, which are processed to estimate the subject's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a simple pulse wave detector is used for non-contact detection, then the device complexity is reduced and ease of operation is improved, but the quantity of biological information obtained is insufficient
Solution Approach 1:
The imaging device is divided into multiple independent light receiving elements arranged in a matrix, with each element capable of detecting light at different wavelengths. This segmentation allows simultaneous collection of multiple biological parameters (pulse wave, respiration, blood flow, temperature) from different spatial locations, thereby increasing the quantity of biological information without requiring multiple separate devices
Solution Approach 2:
The imaging device serves multiple functions: it detects pulse waves, respiration, blood flow, and temperature simultaneously using the same hardware platform. By capturing reflected light at multiple wavelengths with multiple light receiving elements, the system provides comprehensive biological state monitoring through a single device, resolving the contradiction between information quantity and device complexity
2Quantity of substance
If multiple light sources and imaging elements are used to increase biological information, then the quantity of biological information is improved, but the device complexity increases
Solution Approach 1:
Multiple light sources emitting at different wavelengths are combined into a single imaging system, and multiple light receiving elements are integrated into one imaging device. The controller coordinates the alternating emission of light sources and the corresponding detection by specific light receiving elements, merging multiple detection functions into a unified system that increases biological information while managing complexity through integrated design
Solution Approach 2:
The light sources are controlled to emit light alternately in a periodic manner, with each light source emitting for a specific time period. The controller synchronizes the imaging device to capture images during each emission period, allowing sequential collection of data at different wavelengths. This periodic action enables multiple measurements to be taken over time using the same hardware, increasing information quantity without proportionally increasing device complexity
3Quantity of substance
If light sources emit alternately to capture different wavelength images, then the quantity of biological information is improved, but the time required for detection increases
Solution Approach 1:
The light sources emit light alternately in a continuous sequence without interruption, and the imaging device continuously captures images during each emission period. The controller maintains continuous operation by immediately switching to the next light source after one completes its emission cycle. This continuous alternating emission and detection process ensures that multiple biological parameters are measured in an uninterrupted time sequence, minimizing detection time while maximizing information quantity
Solution Approach 2:
The system uses periodic alternating emission of light sources with synchronized periodic detection by the imaging device. Each complete cycle of alternating light emission and corresponding image capture is performed rapidly and repeatedly. This periodic action allows the system to collect data at multiple wavelengths in a time-multiplexed manner, where the total detection time is the sum of brief sequential measurement periods rather than simultaneous measurement 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 approach generates a larger amount of biological information compared to existing methods, enabling more comprehensive and accurate detection of the subject's state, including pulse, breathing, and posture, without disturbing the subject.
Implementation Method 1
an imaging device including a plurality of elements which receive reflected light of the light emitted from the first light source and reflected light of the light emitted from the second light source, the light emitted from the first light source and the light emitted from the second light source being reflected by the person
Data Source
AI summary
A biological state detecting apparatus which generates biological information of a person, light sources which emit light having a first wavelength and light having a second wavelength, respectively, an imaging device which receives reflected light of the emitted light, a controller which controls the light sources, an arithmetic operator which reads out a first image and a second image from the imaging device and performs an arithmetic operation thereon, and a state estimator which generates the biological information of the person. The arithmetic operator generates a distance image based on the first image and the second image.