• Python packages: OpenCV, Pillow, Pytesseract. pip3 install -r requirements.txt
• Tesseract executable: apt install tesseract-ocr

Here's the detailed walkthrough:

• Run ./clocks.sh on a terminal and zoom in for bigger characters.
• Start your video pipeline and point the camera to the ./clocks.sh terminal.
• Have your video show its output on your screen.
• Run ./main.py and use your left and middle mouse buttons to enclose the clocks.
• Press q to continue.
• The time difference in between clocks should be printing on your screen.

For more, call main.py --help. Expect having to do some image fine-tuning (thresholding, grayscaling...), mostly due to Tesseract's pitfalls.