Adaptive Pulse Wave Estimation via Dynamic Measurement Region Resetting
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Solution Overview
Problem
The existing non-contact pulse wave estimation techniques face precision deterioration due to changes in camera installation layouts or image resolution, affecting the accuracy of pulse wave estimation.
Innovation Solution
A pulse wave estimating device that dynamically resets measurement regions by adjusting the number of divisions or extending measurement regions over adjacent areas to maintain a threshold pixel ratio, ensuring sufficient pixel count and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If measurement regions are divided into multiple small regions, then the measurement coverage increases, but the number of pixels per region decreases leading to deterioration of pulse wave estimation precision
Solution Approach 1:
The patent applies dynamics by making the measurement region configuration adaptive rather than fixed. The processing circuitry dynamically adjusts the number of divisions and pixel allocation based on detected skin region characteristics, allowing the system to optimize between coverage and precision for each measurement condition.
Solution Approach 2:
The patent changes parameters by adjusting the number of measurement regions and pixels per region based on skin region area and aspect ratio. The system modifies these parameters adaptively to maintain optimal pulse wave estimation precision while ensuring sufficient measurement coverage.
2Area of stationary object
If the camera installation layout changes, then the measurement area coverage changes, but the image resolution deteriorates leading to loss of resolving power
Solution Approach 1:
The system changes parameters by detecting skin region characteristics and adjusting measurement region divisions accordingly. When camera layout changes affect image resolution, the processing circuitry adapts the number of divisions and pixels per region to compensate and maintain measurement quality.
Solution Approach 2:
The patent implements feedback by continuously monitoring skin region characteristics and using this information to adjust measurement region configuration. The system measures skin region area and aspect ratio, then uses this feedback to optimize the division strategy for maintaining both coverage and resolution.
3Adaptability or versatility
If the number of measurement regions is increased, then the measurement comprehensiveness improves, but the pixel count per region decreases affecting estimation accuracy
Solution Approach 1:
The patent applies local quality by allocating different numbers of pixels to different measurement regions based on their specific characteristics. Rather than uniform division, the system adjusts pixel allocation locally to ensure each region has sufficient resolution while maintaining overall comprehensiveness.
Solution Approach 2:
The system changes parameters adaptively by adjusting both the number of measurement regions and pixels per region based on skin region characteristics. This allows the system to maintain measurement comprehensiveness while preserving estimation accuracy through optimized parameter selection.
Data Source
AI summary
A pulse wave estimating device includes processing circuitry configured to; acquire a captured image of a human; detect a skin region of the human on the captured image; set, as a plurality of measurement regions for extracting luminance signals representing luminance changes, regions formed by dividing the skin region on the captured image in a predetermined manner; extract the luminance signals on a basis of the luminance changes in the measurement regions on the captured image; and estimate a pulse wave of the human on a basis of the extracted luminance signals; perform measurement region resetting, when a ratio of measurement regions, in which the number of pixels is equal to or greater than a preset reference value among the set plurality of measurement regions, is lower than a threshold, in such a manner as to make the ratio of measurement regions equal to or higher than the threshold.