Python OpenCV 使用滑动条来调整函数参数的方法

import cv2

d = 0
color = 0
space = 0
def change_d(x):
  d = x
  blur = cv2.bilateralFilter(img,d,color,space)
  cv2.imshow("myImg",blur)

def change_color(x):
  color = x
  blur = cv2.bilateralFilter(img,d,color,space)
  cv2.imshow("myImg",blur)

def change_space(x):
  space = x
  blur = cv2.bilateralFilter(img,d,color,space)
  cv2.imshow("myImg",blur)

img = cv2.imread('car2.jpeg')
cv2.namedWindow('myImg')
cv2.createTrackbar('d','myImg',1,500,change_d)
cv2.createTrackbar('color','myImg',1,500,change_color)
cv2.createTrackbar('space','myImg',1,500,change_space)

while(1):
  k = cv2.waitKey(1)&0xFF
  if k==27:
    break
  d = cv2.getTrackbarPos('d','myImg')
  color = cv2.getTrackbarPos('color','myImg')
  space = cv2.getTrackbarPos('space','myImg')


cv2.destroyAllWindows()