Why Contactless Vital Signs Matter
Traditional vital sign measurement requires dedicated hardware — pulse oximeters, blood pressure cuffs, and thermometers. For remote patient monitoring, this creates barriers: patients must purchase devices, learn to use them correctly, and remember to take measurements consistently.
Contactless vital sign technology eliminates these obstacles entirely. By analyzing subtle color changes in the skin captured through a standard smartphone camera, clinicians can obtain heart rate, respiratory rate, blood oxygen saturation, and stress indicators without any wearable or peripheral device.
How Camera-Based Measurement Works
Camera-based photoplethysmography (rPPG) uses computer vision and signal processing to detect the tiny fluctuations in skin color caused by blood flow. Each heartbeat pushes oxygenated blood through capillaries near the skin's surface, creating measurable changes in reflected light.