Remove background of the image using opencv Python

Question

I have two images, one with only background and the other with background + detectable object (in my case its a car). Below are the images

I am trying to re

Answer 1

The problem is that you're subtracting arrays of unsigned 8 bit integers. This operation can overflow.

To demonstrate

>>> import numpy as np
>>> a = np.array([[10,10]],dtype=np.uint8)
>>> b = np.array([[11,11]],dtype=np.uint8)
>>> a - b
array([[255, 255]], dtype=uint8)

Since you're using OpenCV, the simplest way to achieve your goal is to use cv2.absdiff().

>>> cv2.absdiff(a,b)
array([[1, 1]], dtype=uint8)