Height-Adjustable rPPG Terminal for Face-Centered Signal Capture
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Solution Overview
Problem
Remote photoplethysmography (rPPG) technology is affected by noise from ambient light and subject movement, and existing devices are not easily adjustable for user convenience and accurate positioning.
Innovation Solution
A height-adjustable biological signal measuring device that uses infrared wavelength lasers and RGB cameras to photograph and analyze video images, with a method to recognize user information, set focus, and adjust height to center the user's face for accurate biometric measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rPPG technology is used to measure biological signals remotely, then contactless measurement is achieved, but signal quality deteriorates due to noise from ambient light and subject movement
Solution Approach 1:
The patent changes the optical parameters by using specific wavelength lasers (red light at 630nm, infrared at 940nm) and controlling light intensity to improve signal quality while maintaining contactless measurement. The system adjusts laser wavelengths and intensities to optimize blood volume pulse detection against ambient light interference.
Solution Approach 2:
The patent implements dynamic height adjustment of the terminal device to maintain optimal positioning relative to the user's face. The height-adjustable mechanism dynamically adapts to different user heights and positions, reducing movement-induced noise and improving signal stability during measurement.
2Device complexity
If fixed-height measurement devices are used, then device structure is simplified, but measurement accuracy deteriorates due to inability to adapt to different user heights
Solution Approach 1:
The patent implements a height-adjustable terminal device with movable mounting structures that allow dynamic positioning at different heights. This enables the camera and lasers to be positioned optimally for each user, ensuring accurate face centering and consistent measurement geometry across users of varying heights.
Solution Approach 2:
The height-adjustable design makes the measurement device universal, capable of accommodating users with different heights and body types. The same device can be used across diverse populations by adjusting the height position, eliminating the need for multiple fixed-height devices.
3Device complexity
If manual positioning of the device is used, then device structure is simplified, but ease of use deteriorates due to difficulty in centering user's face
Solution Approach 1:
The patent implements automatic face centering through image processing algorithms that detect the user's face position and automatically adjust the device height or camera angle. The system uses the camera to capture the user's face, analyzes the image to determine if the face is centered, and automatically positions the device to achieve proper centering without manual intervention.
Solution Approach 2:
The system incorporates feedback loops where the camera continuously monitors the user's face position, and the control system adjusts the device height or camera orientation based on this feedback. The face centering status is detected and used to control the positioning mechanism, creating a closed-loop system that automatically maintains optimal positioning.
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 device reduces errors in signal collection by adjusting height based on user height, ensuring reliable biometric results without being restricted by the user's position, and minimizes noise interference.
Implementation Method 1
measuring the user's biometric information by irradiating the user's face with near-infrared rays from an optical output unit of the terminal and analyzing the irradiating near-infrared rays in the video image with the video image measuring device
Implementation Method 2
analyzing the irradiating near-infrared rays in the video image
Implementation Method 3
photographing the reflected R-value and the change of the infrared wavelength laser as video images
Data Source
AI summary
Proposed is a driving method for a height-adjustable biological signal measuring device. The method includes a step of recognizing a user's unique information, a step of setting the focus of a video image measuring device to a preset value, a step of photographing the user and acquiring the user's images from the video image measuring device, a step of acquiring the image data from the photographed video image data and preprocessing the images in a video image processing unit, a step of recognizing a face according to the user's state using the pre-processed image, a step of determining whether the user's face is at the center of the screen, and a step of fixing the position of a terminal and measuring the user's biometric information.