python - TypeError : src is not a numpy array, 既不是标量。无流

Question

import cv2
import numpy as np
cam = cv2.VideoCapture('tcp://192.168.1.1:5555')
img_gray = cv2.cvtColor(cam,cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(img_gray, 127, 255,0)
contours,hierarchy = cv2.findContours(thresh,2,1)
cnt = contours[0]

hull = cv2.convexHull(cnt,returnPoints = False)
defects = cv2.convexityDefects(cnt,hull)

for i in range(defects.shape[0]):
    s,e,f,d = defects[i,0]
    start = tuple(cnt[s][0])
    end = tuple(cnt[e][0])
    far = tuple(cnt[f][0])
    cv2.line(img,start,end,[0,255,0],2)
    cv2.circle(img,far,5,[0,0,255],-1)

cv2.imshow('img',cam)
cv2.waitKey(0)
cv2.destroyAllWindows()

当从我的无人机流式传输以检测排水沟的轮廓时，我试图找到轮廓，但我收到此错误。我不确定如何修复它。任何帮助将不胜感激。

Answer 1

import cv2
import numpy as np

cam = cv2.VideoCapture('tcp://192.168.1.1:5555')
if not cam.isOpened():
    print("VideoCapture failed to open")

while True:
    ret, frame = cam.read()

    if ret == False:
        print("frame empty")
        break

    img_gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    ret, thresh = cv2.threshold(img_gray, 127, 255,0)
    contours,hierarchy = cv2.findContours(thresh,2,1)
    cnt = contours[0]

    hull = cv2.convexHull(cnt,returnPoints = False)
    defects = cv2.convexityDefects(cnt,hull)

    for i in range(defects.shape[0]):
        s,e,f,d = defects[i,0]
        start = tuple(cnt[s][0])
        end = tuple(cnt[e][0])
        far = tuple(cnt[f][0])
        cv2.line(img,start,end,[0,255,0],2)
        cv2.circle(img,far,5,[0,0,255],-1)

   cv2.imshow('img',frame)
   cv2.waitKey(0)

cv2.destroyAllWindows()

我认为你可以做这样的事情来解决你的代码的问题。