This is a very simple Flask app that let's the user upload a image and detects how many (if any) faces are there in the picture.
pipenv install opencv-contrib-python
pipenv install Flask
pipenv install gunicorn
pipenv install numpy
https://elements.heroku.com/buildpacks/heroku/heroku-buildpack-apt
and include a list of apt package names to be installed the Aptfile
Docker container based on: https://hub.docker.com/r/shosoar/alpine-python-opencv/
To build the docker image and run locally:
cd face_detection_flask
docker build -t face_detection_flask .
docker run -it -p 3000:80 face_detection_flask