Пишу код по гайду, но он работает некорректно. Пожалуйста, укажите на ошибку

 import numpy as np
from PIL import ImageGrab
import cv2
import time
from directkeys import ReleaseKey, PressKey, W, A, S, D
def process_img(original_image):
    processed_img = cv2.cvtColor (original_image, cv2.COLOR_BGR2GRAY)
    processed_img = cv2.Canny (processed_img, threshold1=200, threshold2=300)
    return processed_img
for i in list (range (4))[::-1]:
    print(i+1)
    time.sleep(1)
last_time = time.time()
while(True):
    screen =  np.array(ImageGrab.grab(bbox=(0,40, 800, 640)))
    new_screen = process_img(screen)
    print('down')
    PressKey(W)
    time.sleep(3)
    print('up')
    PressKey(W)
    print ('Loop took {} seconds'.format(time.time()-last_time))
    last_time = time.time()
    cv2.imshow ('window', new_screen)
    #cv2.imshow('window2',cv2.cvtColor(screen, cv2.COLOR_BGR2RGB))
    if cv2.waitKey(25) & 0xFF == ord('q'):
        cv2.destroyAllWindows()
        break

 import ctypes
import time
SendInput = ctypes.windll.user32.SendInput
W = 0x11
A = 0x1E
S = 0x1F
D = 0x20
# C struct redefinitions 
PUL = ctypes.POINTER(ctypes.c_ulong)
class KeyBdInput(ctypes.Structure):
    _fields_ = [("wVk", ctypes.c_ushort),
                ("wScan", ctypes.c_ushort),
                ("dwFlags", ctypes.c_ulong),
                ("time", ctypes.c_ulong),
                ("dwExtraInfo", PUL)]
class HardwareInput(ctypes.Structure):
    _fields_ = [("uMsg", ctypes.c_ulong),
                ("wParamL", ctypes.c_short),
                ("wParamH", ctypes.c_ushort)]
class MouseInput(ctypes.Structure):
    _fields_ = [("dx", ctypes.c_long),
                ("dy", ctypes.c_long),
                ("mouseData", ctypes.c_ulong),
                ("dwFlags", ctypes.c_ulong),
                ("time",ctypes.c_ulong),
                ("dwExtraInfo", PUL)]
class Input_I(ctypes.Union):
    _fields_ = [("ki", KeyBdInput),
                 ("mi", MouseInput),
                 ("hi", HardwareInput)]
class Input(ctypes.Structure):
    _fields_ = [("type", ctypes.c_ulong),
                ("ii", Input_I)]
# Actuals Functions
def PressKey(hexKeyCode):
    extra = ctypes.c_ulong(0)
    ii_ = Input_I()
    ii_.ki = KeyBdInput( 0, hexKeyCode, 0x0008, 0, ctypes.pointer(extra) )
    x = Input( ctypes.c_ulong(1), ii_ )
    ctypes.windll.user32.SendInput(1, ctypes.pointer(x), ctypes.sizeof(x))
def ReleaseKey(hexKeyCode):
    extra = ctypes.c_ulong(0)
    ii_ = Input_I()
    ii_.ki = KeyBdInput( 0, hexKeyCode, 0x0008 | 0x0002, 0, ctypes.pointer(extra) )
    x = Input( ctypes.c_ulong(1), ii_ )
    ctypes.windll.user32.SendInput(1, ctypes.pointer(x), ctypes.sizeof(x))
# directx scan codes http://www.gamespp.com/directx/directInputKeyboardScanCodes.html
if __name__ == '__main__':
    while (True):
        PressKey(0x11)
        time.sleep(1)
        ReleaseKey(0x11)
        time.sleep(1)