opencv-python 应用滑动条改变canny边缘检测的阈值

# -*- coding:utf - 8 -*-
import cv2
img = cv2.imread("C:/Users/Administrator/Desktop/gou.jpg", 0)

def on_canny():
mix = cv2.getTrackbarPos("mix","s")
max = cv2.getTrackbarPos("max","s")
edges = cv2.Canny(img,mix,max)
cv2.imshow("s", edges)

cv2.namedWindow("s")
cv2.createTrackbar("mix","s",0,255,on_canny)
cv2.createTrackbar("max","s",0,255,on_canny)

while(1):
on_canny()
k = cv2.waitKey(1)&0xFF
if k == 27:
break
cv2.destroyAllWindows()