Add padding to images to get them into the same shape

Question

l have a set of images of different sizes (45,50,3), (69,34,3), (34,98,3). l want to add padding to these images as follows:

Take the max width and leng

Answer 1

Like this (Padding is called borders on openCV):

BLUE = [255,255,255]
constant= cv2.copyMakeBorder(image.copy(),10,10,10,10,cv2.BORDER_CONSTANT,value=BLUE)

And blue can become white even

source: https://docs.opencv.org/3.4/da/d0c/tutorial_bounding_rects_circles.html