Coding Explanation

Within our Jupyter Notebook we use python library called subprocess

Python code allows us to import many libraries into our code. The libraries are bundles of pre written python modules, with many functions with different roles.

This Library subprocess allows us to spawn new command line processes, send input informations to them and recieve output results or errors.

For example, when we wish to open our original image:

  1. We define the location of our program (for this case show.sh).

  2. We use the call function from subprocess library.

# Check the original image
run_command_before = 'bash ~/ai_example/show.sh orange before' #1st
subprocess.call((run_command_before.split('\n')), shell=True)  #2nd

The call function allows us to execute our command in command line interface and recieve the returncode from the said command. We can force the cell to create a new shell window by turning the shell option within call function True.

Our command is a shell script which is a file that contains pre-written shell commands inside them.

We have total of 3 shell programs:

  1. show.sh

  2. detect.sh

  3. kill.sh

  • show.sh program would create a new display to show either the input image or the input video.

  • detect.sh program would run inference on an input image(s), video(s) or a camera feed.

  • kill.sh program would kill the created display, and the camera feed (if it ever was created)