When your heart beats, your skin “micro blushes” red. Undetectable by the human eye, Lifelight’s algorithms captures these tiny changes in colour, cleans up the signals and converts them into vital sign measurements.
Our solution is based on photoplethysmography (PPG), used today in the finger pulse oximeter. Widely used by clinicians to measure pulse, the wired clip is placed on your fingertip. Lifelight has uniquely taken the science one step further by using rPPG – remote photoplethysmography – enabling Lifelight to be 100% contactless.
In clinical terms, PPG is a non-invasive technology that uses a light source and a photodetector at the surface of skin to measure the volumetric variations of blood circulation. Remote PPG (rPPG) is an evolution of PPG technology that no longer requires physical contact, relying instead on ambient light being reflected from the skin and captured remotely by a CMOS (complementary metal-oxide semiconductor) camera. The colour signals captured can then be filtered using AI techniques such as Independent Component Analysis (ICA).
When a patient looks at Lifelight on a tablet or smartphone, the device’s camera uses the ambient light to pick up changes in the skin by light reflecting off blood vessels in the hypodermis. The camera’s readings are then converted into red, green and blue (RGB) values at a rate of 30 times a second and sent to the cloud.
These RGB values are then passed through independent component analysis, followed by signal processing and finally analysed by Lifelight’s algorithms to return the vital signs readings.
In just 40 seconds Lifelight delivers a single set of measurements – which currently requires multiple devices.
Due to the market-first nature of the technology, Lifelight is effectively patented (two), contractually protected and proven by a uniquely large clinical dataset. This proprietary databank has proven the accuracy of Lifelight over traditional methods.
Lifelight’s technology is a practical application of rPPG using ubiquitous mobile phones and tablets for static non-contact health monitoring of patients/consumers, eliminating the need for additional devices.