具体程序如下
import cv2
import numpy as np
def xunhuangetimage1():
folder_path = 'D:\image2\picture' # 在image2文件夹生成循环截图成果
cap = cv2.VideoCapture(1, cv2.CAP_DSHOW)
i=0
while i<400:
ret, frame = cap.read()
cropped = frame[316:345, 114:141]
gray = cv2.cvtColor(cropped, cv2.COLOR_BGR2GRAY)
ret, thresh1 = cv2.threshold(gray, 240, 255, cv2.THRESH_BINARY)
cv2.imwrite(folder_path + str(i) + '.jpg', thresh1) # 存储为图像
i+=1
cap.release()
cv2.destroyAllWindows()
def xunhuangetimage2():
folder_path = 'D:\image3\picture' # 在image3文件夹生成循环截图成果
cap2 = cv2.VideoCapture(0, cv2.CAP_DSHOW)
j=0
while j<400:
ret2, frame2 = cap2.read()
cropp2 = frame2[265:300, 161:190]
cropped2 = np.rot90(cropp2, 3)
gray2 = cv2.cvtColor(cropped2, cv2.COLOR_BGR2GRAY)
ret2, thresh2 = cv2.threshold(gray2, 240, 255, cv2.THRESH_BINARY)
cv2.imwrite(folder_path + str(j) + '.jpg', thresh2) # 存储为图像
j+=1
cap2.release()
cv2.destroyAllWindows()
import threading
p1 = threading.Thread(target=xunhuangetimage1, args=())#同时运行循环和截图功能,摄像头一进行循环采集图片操作
p2 = threading.Thread(target=xunhuangetimage2, args=())#摄像头二进行循环采集图片操作
p1.start()
p2.start()
两个函数各自单独运行是能达到预期效果的，但一旦多线程工作就会报如下错误
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python39\lib\threading.py", line 892, in run
self._target(*self._args, **self._kwargs)
File "D:/pythonProject/循环截图.py", line 10, in xunhuangetimage1
cropped = frame[316:345, 114:141]
TypeError: 'NoneType' object is not subscriptable
Exception in thread Thread-6:
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python39\lib\threading.py", line 954, in _bootstrap_inner
self.run()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python39\lib\threading.py", line 892, in run
self._target(*self._args, **self._kwargs)
File "D:/pythonProject/循环截图.py", line 10, in xunhuangetimage1
cropped = frame[316:345, 114:141]
TypeError: 'NoneType' object is not subscriptable
Process finished with exit code -1
能请问大家这是哪里出了问题，该怎么修改么？
xunhuangetimage1函数中VideoCapture打开的1通道摄像头存在吗,单独运行xunhuangetimage1报错吗,我这里实验,两个摄像头,不保错
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