Introduction• Digital medical devices promise to transform the future ofmedicine because of their ability to produce exquisitely detailedindividual physiological data.• Current techniques for physiological monitoring typicallyrequire users to strap on bulky sensors, chest straps or stickyelectrodes.• A new mirror interface for real-time, contact-freemeasurements of heart rate without the need for externalsensors.
Design• Medical Mirror to provide a natural user Interface.• An LCD monitor with a built-in webcam to provide an interactivedisplay.• A two-way mirror was fitted onto the frame to present a reflectivesurface for the users in normal lighting conditions.• The user is visible to the webcam and the LCD monitor can be usedto project information onto the reflective surface of the mirror.• The monitor and webcam are connected to a laptop running theanalysis software in real-time.
How does this technology work??• It uses light to measure the information from your body.• Every time your heart beats, the blood in your vessels increases very slightly.• Blood absorbs light and so this increase absorbs more mono light, decreasing the amount of light being transmitted or reflected by your body.• In this case were just using the ambient light around you: sunlight, room light or anything thats illuminating your environment.• The camera then measures the mono light being reflected off you, in this case, your face.
Working• An automated face tracker detects the largest face within the videofeed from the webcam and localizes the measurement region ofinterest (ROI) for each video frame.• It uses light to measure the information from your body.• The raw RGB signals are decomposed into three independentcomponents using independent component analysis.• The power spectrum of the component containing the strongestblood volume pulse signal is then computed.• The user’s heart rate is quantified as the frequency thatcorresponds to the highest power of the spectrum within anoperational frequency band (45-240 bpm).
Interaction• A single user will be able to interact with the mirror at a time.• When looking into the mirror, the user will see a box appear aroundhis/her face and a timer will be displayed on the top corner of the box.• Users will be asked to stay relatively as the timer counts down.• User’s heart rate will be displayed on the mirror, allowingsimultaneous visualization of his/her physical appearance andphysiological state.• The heart rate measurement will be updated continuously until theuser looks away.
Advantages• The Medical Mirror fits seamlessly into the ambient homeenvironment.• Blending the data collection process into the course of our dailyroutines.• This interface is intended to provide a convenient means for peopleto track their daily health with minimal effort.• You could also use it on a phone or laptop or any device that has acamera.
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