To run the perspective projection (homography) code:

python homography.py pepsi.jpg
(Pl note that the image coordinates start from top left corner and right/down in positive)
Enter the corner point coordinates for the original image: [[141,276],[503,276],[503,417],[141,417]]
Enter the corner point coordinates for the transformed image: [[955,198],[1071,506],[847,504],[717,281]]

To run the zoompivot code: python zoompivot.py lena.jpg

(Pl note that the image coordinates start from top left corner and right/down in positive)
enter the pivot pixel coordinates: [100,100]
enter the scale: 3

Done