Heart Rate Measurement Using Ambient Light Wavelength Selection
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Solution Overview
Problem
Existing heart rate measurement systems using ambient light as a light source face challenges in stability and accuracy due to variations in ambient light conditions over time, location, and other factors.
Innovation Solution
A heart rate measurement system that acquires ambient light information across multiple wavelength ranges, references an ambient light map to select an optimal wavelength for measurement, and calculates heart rate based on this selected wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ambient light is used as a light source for heart rate measurement, then the system can operate without additional lighting equipment, but the measurement accuracy and stability deteriorate due to variations in ambient light conditions
Solution Approach 1:
The patent applies parameter changes by measuring ambient light characteristics across multiple wavelength ranges and dynamically selecting the optimal wavelength based on current lighting conditions. This allows the system to adapt to varying ambient light parameters (intensity, spectrum) while maintaining measurement accuracy, resolving the contradiction between using simple ambient light and achieving precise heart rate measurement
2Measurement precision
If ambient light information is measured across multiple wavelength ranges to select optimal wavelength, then heart rate measurement accuracy improves, but the system complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing an ambient light map that stores optimal wavelength information for different imaging locations and ambient light conditions. During actual heart rate measurement, the system simply queries this pre-computed map rather than performing complex real-time analysis, thereby achieving high measurement accuracy while keeping the runtime system relatively simple
Solution Approach 2:
The patent introduces a new dimension by creating an ambient light map that adds spatial and spectral dimensions to the measurement system. This map stores wavelength optimization data across multiple imaging points and wavelength ranges, allowing the system to navigate this extended parameter space to find optimal measurement conditions without increasing basic system complexity
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 more accurate and stable heart rate measurement by minimizing the influence of ambient light variations, ensuring consistent results across different environmental conditions.
Implementation Method 1
heart rate measurement using reflected light from a face is performed mainly using ambient light as a light source
Data Source
AI summary
There is provided a heart rate measurement system, a heart rate measurement method, and a program that enable more accurate heart rate measurement to be performed stably. Ambient light information is acquired from a moving image obtained by imaging a subject with light for each of at least three or more of a plurality of wavelength ranges, the ambient light information including at least a luminance intensity for each wavelength range of ambient light in which the moving image is captured. Further, an ambient light map in which reference ambient light information, which is the ambient light information obtained by measuring ambient light at a plurality of imaging points in advance, is registered for each of the imaging points is referred to, and a desired wavelength is selected on the basis of the ambient light information at an imaging point at which the moving image is captured. Then, a heart rate of the subject shown in the moving image is calculated on the basis of the selected wavelength. The present technology can be applied to, for example, a heart rate measurement system.