OpenCV REST API Extract faces from any image by building a REST API microservice using OpenCV Lesson Code Lessons 1-3: no significant code added 4 - Hello World with Flask and Gunicorn 5 - Storage Dirs Config 5 - Storage Directories 6 - Serve Static Files 7 - Allowed File Extensions 8 - API Upload View 8 - API Upload View 9 - Python Requests Uploader Module 10 - Save File Uploads 11 - File Upload Handler 12 - Display Image via OpenCV 13 - Loading HaarCascades 14 - Extracting Faces with OpenCV 15 - Faces Extract Utility Function 16 - OpenCV Upload & Extract View