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)







以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持中文源码网。