Edge Detection preprocessing block

This implements an edge detection processing block in Edge Impulse. How to use:

1. Docker:

   1. Build the container:

      $ docker build -t edge-detection-block .
      

   2. Run the block:

      $ docker run -p 4446:4446 -it --rm  edge-detection-block
      

2. Or, locally:

   1. Install Python 3.8.

   2. Install the dependencies:

      $ pip3 install -r requirements-blocks.txt
      

   3. Run the block:

      $ python3 dsp-server.py
      

3. Install ngrok and open up port 4446 to the world:

   $ ngrok http 4446
   

   Note down the 'Forwarding' address that starts with https, e.g.:

   Forwarding                    https://4e9e1e61e3aa.ngrok.io -> http://localhost:4446
   

4. In Edge Impulse, go to Create impulse, click Add a processing block, click Add custom block and enter the URL from the previous step.

5. You now have edge detection as a preprocessing block:

   

6. Train your model as usual 🚀