text: import sys
  import numpy as np
  import cv2
  import random as rand
  
  def increase_brightness(amount, img):
      img = np.where((255 - img) < amount, 255, img + amount)
      return img
  
  def decrease_brightness(amount, img):
      img = np.where(img < amount, 0, img - amount)
      return img
  
  def change_brightness(amount, img):
      if rand.randint(0, 1) == 0:
          return decrease_brightness(amount, img)
      else:
          return increase_brightness(amount, img)
  