iPhys

iPhys implements imaging-based non-contact physiological measurement methods to extract cardiac and respiratory signals from video using imaging photoplethysmography (iPPG) and imaging ballistocardiography (iBCG).

Key Features:

• Non-Contact Measurement: Enables acquisition of physiological data from video without physical contact with the subject.
• Imaging Photoplethysmography (iPPG): Measures volumetric changes in blood flow by capturing variations in light transmission or reflection across image sequences.
• Imaging Ballistocardiography (iBCG): Detects cardiac-induced vertical head or body movements using optical flow estimation on video frames.
• Spatial and Concomitant Measurement: Supports simultaneous, spatially resolved measurement from a single sensor to capture signals across regions.
• Video Signal Processing Algorithms: Implements algorithms for processing video sequences to extract physiological signals such as heart rate and respiratory patterns.
• Standardized Computational Tools: Provides consistent algorithmic implementations to facilitate reproducibility and comparability across studies.

Scientific Applications:

• Remote Health Monitoring: Extraction of heart rate and respiratory patterns from video for remote physiological assessment.
• Stress Analysis: Analysis of video-derived cardiac and respiratory signals to support studies of stress-related physiological responses.
• Sleep Studies: Non-contact monitoring of cardiac and respiratory patterns during sleep using video recordings.

Methodology:

Computational methods explicitly include video-sequence processing algorithms implementing imaging photoplethysmography (iPPG) and imaging ballistocardiography (iBCG) with optical flow estimation to extract heart rate and respiratory signals.