Brief description
The Heart Rate Engine is a software library designed to estimate a person's heart rate in real-time from a standard video stream of their face. This is achieved using a non-invasive technique that analyzes subtle color changes in the skin caused by blood flow (remote photoplethysmography - rPPG). The engine detects a face, tracks a region of interest, and processes the color signal from this region to calculate the beats per minute (BPM).

This solution provides the following:

• Detect faces in the image
• Track faces and label them frame by frame with a unique identifier
• Detect subtle colour changes in the faces caused by blood flow to measure heart rate
• Provides the heart beats per minute (BPM) and the heart rate diagram measured from the changes in face colour
• The limitation is that the user cannot move during the measurement

Technology

The approach to remote detection is the following:

• [Skin pixel selection] The face in the captured webcam image is detected and modeled in order to determine facial landmarks and head orientation. Subsequently, approximately the top two-thirds of the face, where most of the blood vessels are concentrated, is selected as the region of interest.
• [Signal extraction] The average of each pixel colors (red, green, blue) of the region is measured over time (both specular + diffuse reflections).
• [Signal filtering] The noise from the head motions is detected by fitting the facial model and then noise-free heart rate is produced.
• [Output calculations] By detecting peaks, inter-beat intervals are measured and then the heart rates and heart rate variability are estimated.

What's Included:

• Complete C++ source code files
• Detailed code documentation
• Pre-trained neural networks
• Precompiled OpenCV WebAssembly Module
• Instructions for compiling the project with Emscripten
• Bonus: Build guide for OpenCV that shows how to compile it to WebAssembly

Technical Requirements:

• Knowledge of C++ programming and basic understanding of neural networks.
• Emscripten SDK for compiling to WebAssembly.

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License
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