Computer vision basics

The link to the python notebook and the two images used is provided below:
Notebook: https://colab.research.google.com/drive/1e6C30pNh70OkqnUEj0cG2Ftme5XDAavr
chair2.jpg: https://drive.google.com/open?id=1ASzdRORVahgWRIOqcFIE5U7ibGOCeSu7
chair3.jpg: https://drive.google.com/open?id=1cUIlJGGbVRKcGsZ2s8-48wcFDI9sT4Jv