Pedometer and Health Watcher

Pedômetro, frequência cardíaca, pressão arterial, frequência respiratória e taxa de oxigênio

The Pedometer and Health Watcher stores the user's step count per hour and it can estimate Heart rate, Blood pressure, Respiration rate and Oxygen rate from only the camera of the mobile without using any extra sensors.

👣 The user can review the recorded steps in a daily, weekly and monthly report 📊. These reports also display the calculated distance and calories. As a bonus feature the app can record training sessions (e.g. a jogging session) in a different view. The user can choose whether the app should remind him if the achievement of his daily step goal is in danger.

This application uses the PPG signal which will be obtained from the mobile camera, only by applying image processing method on each frame to get the RGB intensities, each of them contains the PPG signal that will be processed to estimate the four vital signs.

How the processes works 👶👶👶

A preview for 30 seconds of recording will be processed frame by frame to get the intensities of RBG colors on each frame.

💖 Heart rate

Red and Green intensities will be stored in an array that will be applied on a Fast Fourier Transform, on the resultant array the highest peak after neglecting the noise which will be on the first few stored data will contain the frequency of the heart rate on 1 second, after that the heart beat will be estimated. (Fft)

💙 Blood pressure

After estimating the heart rate, blood pressure can be estimated by using some equation which will be mentioned in the references.

👃 Respiration Rate

Same as Heart Rate, the difference is a bandpass filter must be applied from 0.1 Hz to 0.4Hz with 0.2Hz center frequency to get the Respiration rate. (Fft2)

💧 Oxygen Saturation Level

Ac and Dc signals must be obtained from the PPG signal. Dc signal is the mean values of the Red and Blue intensities for the whole period of time, while the Ac Signal is the Standard Deviation