python opencv捕获摄像头并显示内容的实现

1、捕获摄像头和实时显示

import cv2
import numpy as np
import pickle
import matplotlib.pyplot as plt

cap = cv2.VideoCapture(0)

while True:
 ret,frame = cap.read()
 # Our operations on the frame come here
 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
 # Display the resulting frame
 cv2.imshow('frame',gray)
 if cv2.waitKey(1) & 0xFF == ord('q'):
   break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

2、从摄像头内抓拍图片

import cv2
import numpy as np
import pickle
import matplotlib.pyplot as plt

cap = cv2.VideoCapture(0)
index = 0
while True:
 ret,frame = cap.read()
 # Our operations on the frame come here
 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
 # Display the resulting frame
 cv2.imshow('frame',gray)
 if cv2.waitKey(1) & 0xFF == ord('p'):
   cv2.imwrite("kk.jpg",frame)
   index = index + 1
 if cv2.waitKey(1) & 0xFF == ord('q'):
   break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

补充：python-----从本地摄像头和网络摄像头截取图片

import cv2

# 获取本地摄像头
# folder_path 截取图片的存储目录
def get_img_from_camera_local(folder_path):
 cap = cv2.VideoCapture(0)
 i = 1
 while True:
   ret, frame = cap.read()
   cv2.imshow("capture", frame)
   print str(i)
   cv2.imwrite(folder_path + str(i) + '.jpg', frame) # 存储为图像
   if cv2.waitKey(1) & 0xFF == ord('q'):
     break
   i += 1
 cap.release()
 cv2.destroyAllWindows()

# 获取网络摄像头，格式：rtsp://username:pwd@ip/
# folder_path 截取图片的存储目录
def get_img_from_camera_net(folder_path):
 cap = cv2.VideoCapture('rtsp://username:pwd@ip/')
 i = 1
 while True:
   ret, frame = cap.read()
   cv2.imshow("capture", frame)
   print str(i)
   cv2.imwrite(folder_path + str(i) + '.jpg', frame) # 存储为图像
   if cv2.waitKey(1) & 0xFF == ord('q'):
     break
   i += 1
 cap.release()
 cv2.destroyAllWindows()

# 测试
if __name__ == '__main__':
 folder_path = 'D:\\img_from_camera\\'
 get_img_from_camera_local(folder_path)

来源：https://www.cnblogs.com/xiaodai0/p/10474750.html