Question

我正试图在网络摄像头上使用Opencv和Python获取hough线。

但是我收到一个错误，如Traceback（最近一次调用最后一次）：File＆＃34; C：/Python27/Hough_video_try.py" ;,第14行，in为rho，the行在行[0]中：TypeError ：＆＃39; NoneType＆＃39;对象没有属性＆＃39; getitem＆＃39;

以下是我的代码，请帮助

import numpy as np
import cv2

cam = cv2.VideoCapture(0)

while (True): s, img = cam.read()
  winName = "Movement Indicator"
  cv2.namedWindow(winName, cv2.WINDOW_AUTOSIZE)
  edges = cv2.Canny(img,100,200)
  lines = cv2.HoughLinesP(edges,1,np.pi/180,2,None,30,1)
  if lines is None:
    for rho,theta in lines[0]:

        pt1 = (line[0],line[1])
        pt2 = (line[2],line[3])
        cv2.line(img, pt1, pt2, (0,0,255), 3)


  cv2.imshow('edges',edges)
  cv2.imshow('original',img)
  if cv2.waitKey(1) & 0xff == ord('q'):
     break

  cam.release()
  cv2.destroyAllWindows()

Answer 1

问题在于您正在检查

if lines is None:

    for rho,theta in lines[0]:

如果lines为None，您将如何获得None[0]？

请更改条件

if lines is not None:

    for rho,theta in lines[0]:

houghtransform行中出错

1 个答案: