（10）边缘检测和渐变

1.一些渐变的例子

import cv2                                                                                                                           
import numpy as np

frame = cv2.imread('avengers.jpg')

laplacian = cv2.Laplacian(frame,cv2.CV_64F)
sobelx=cv2.Sobel(frame,cv2.CV_64F,1,0,ksize=5)
sobely=cv2.Sobel(frame,cv2.CV_64F,0,1,ksize=5)

cv2.imshow('laplacian',laplacian)
cv2.imshow('frame',frame)
cv2.imshow('sobelx',sobelx)
cv2.imshow('sobely',sobely)
cv2.waitKey(0)
cv2.destroyAllWindows()
 

2.canny 边缘检测

edges = cv2.Canny(frame,100,200)