The Technical Architecture: Bridging React and Python One of the biggest hurdles in this project was managing the data flow. Python is the king of Computer Vision, but React is the king of User Experience. To make them talk to each other efficiently, I built a decoupled system. The Frontend (The Collector) Using React.js, I implemented a custom hook to handle the MediaDevices API. The challenge wasn't just showing the video; it was capturing frames at a consistent interval and shipping them to the backend without blocking the UI thread. The Backend (The Processor) The heart of the app is a Python server. I chose Python specifically to leverage the open-rppg library and OpenCV. Processing Pipeline: The backend receives the frame, applies skin-tone detection, and calculates the remote photoplethysmography (rPPG) signal. API Design: I built a lightweight RESTful interface (or WebSocket for real-time) to handle the inference results.…