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Camera-Based Monitoring of Vital Signs Improved

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Refined signal processing allows video cameras to monitor vital signs regardless of ambient lighting and the subject’s skin color. A new algorithm developed by researchers at Rice University detects subtle variations in skin tone caused by blood circulation to determine pulse and breathing rates. The idea of using a camera to track vital signs is based on photoplethysmography (PPG), a way to measure physiological processes under the skin by monitoring subtle changes at the skin’s surface. Camera-based PPG has been studied previously, but its applications were limited...Read full article

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    Published: April 2015
    Glossary
    photoplethysmography
    Photoplethysmography (PPG) is a non-invasive optical technique used to detect changes in blood volume in tissues. It measures variations in light absorption caused by the pulsatile nature of blood flow. Typically, PPG is employed to monitor physiological parameters such as heart rate and blood oxygen saturation. The basic principle involves illuminating the skin or a tissue with a light source, often an LED, and detecting the transmitted or reflected light using a photodetector. The key...
    machine vision
    Machine vision, also known as computer vision or computer sight, refers to the technology that enables machines, typically computers, to interpret and understand visual information from the world, much like the human visual system. It involves the development and application of algorithms and systems that allow machines to acquire, process, analyze, and make decisions based on visual data. Key aspects of machine vision include: Image acquisition: Machine vision systems use various...
    camerasResearch & TechnologyAmericasTexasRice UniversityMayank KumarphotoplethysmographyPPGmachine visionImagingBiophotonicsBioScanTech Pulse

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