Camera Biometric Capture With Adaptive Display Lighting for rPPG Accuracy
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Solution Overview
Problem
Existing remote photoplethysmography (rPPG) technologies for biometric information measurement are affected by factors such as skin tone, motion artifacts, ambient light, and ambient temperature, leading to decreased accuracy and reliability of measurement results.
Innovation Solution
An electronic device with a camera and display adjusts light output based on ambient brightness and distance information to improve biometric information accuracy, using a processor to control the display's light intensity, waveform, and partitioning the screen into areas for optimal biometric signal measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display outputs light for normal operation, then the display functions properly, but the biometric measurement accuracy decreases due to light interference
Solution Approach 1:
The display screen is divided into multiple regions: a first region that outputs light for normal display operation and a second region that outputs light specifically for biometric measurement. This segmentation allows the display to serve dual purposes without interfering with each other, as the biometric measurement region can be independently controlled to minimize light interference while maintaining measurement accuracy.
Solution Approach 2:
Different regions of the display are assigned different functions with different light output characteristics. The first region operates with normal display light output, while the second region is specifically optimized for biometric measurement with adjusted light properties. This local differentiation enables the display to simultaneously support both normal operation and accurate biometric measurement without mutual interference.
2Measurement precision
If the display adjusts light output for biometric measurement, then measurement accuracy improves, but the display's normal operation is affected
Solution Approach 1:
By dividing the display into separate regions with distinct functions, the patent enables the display to maintain normal operation in the first region while performing biometric measurement in the second region. This segmentation ensures that adjustments made for biometric measurement do not propagate to the entire display, preserving normal operation functionality.
Solution Approach 2:
The display is designed to perform multiple functions simultaneously: normal display operation in the first region and biometric measurement in the second region. This multi-functionality allows the display to serve both as a normal display device and as a biometric measurement tool without requiring separate devices, thereby maintaining ease of operation while improving measurement accuracy.
3Reliability
If the camera captures images in ambient light conditions, then the device operates simply, but measurement reliability decreases due to environmental factors
Solution Approach 1:
The patent combines the display and camera systems into an integrated biometric measurement device where the display serves dual purposes as both a normal display and a light source for biometric measurement. This merging eliminates the need for separate external lighting devices, thereby improving measurement reliability through controlled lighting while avoiding the complexity of additional independent lighting systems.
Solution Approach 2:
The display is designed to perform multiple functions: normal display operation, biometric measurement, and providing controlled lighting for measurement. This multi-functionality reduces the need for separate dedicated lighting devices, maintaining device simplicity while improving measurement reliability through integrated light control.
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 solution enhances biometric information measurement accuracy by minimizing the influence of environmental factors, allowing reliable biometric data capture even in varying conditions.
Implementation Method 1
obtaining, through the camera, an input image including a part of a body of a user
Implementation Method 2
controlling the display to adjust a light output through the display based on the sensed ambient brightness information
Implementation Method 3
widening or narrowing of blood vessels as a blood flow rate changes over time may be measured by using properties such as light absorbance and transmittance
Implementation Method 4
Remote photoplethysmography (rPPG) refers to the use of light to measure a blood flow rate
Data Source
AI summary
Provided is a method of obtaining biometric information through a camera. The method may include sensing ambient brightness information; controlling the display to adjust a light output through the display, based on the sensed ambient brightness information; obtaining, through the camera, an input image including a part of a body of a user; and obtaining biometric information of the user based on the input image.