原始圖

角點檢測

points = cv2.goodFeaturesToTrack(gray,100,0.01,10)
points = np.int0(points).reshape(-1,2)

for point in points:
  x,y = point.ravel()
  cv2.circle(img,(x,y),10,(0,255,0),-1)

連線

cv2.line(img,y1),(1000,thickness=3,lineType=8)
cv2.line(img,y2),lineType=8)

完整程式碼

""" 
@author: qq群686070107
""" 
import cv2
import numpy as np
img=cv2.imread("1.jpg")
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
points = cv2.goodFeaturesToTrack(gray,-1)


y1 = min(points[:,1])
y2 = max(points[:,1])

## small and big enough 
cv2.line(img,lineType=8)

cv2.imshow("img",img)
cv2.waitKey(0)

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