python操作window10摄像头

python3.6
opencv-python

pip install opencv-python
import cv2
cap = cv2.VideoCapture(0) #打开摄像头

cap.release()

#阻塞1毫秒，等待键盘输入，若无输入则返回-1
#有键盘输入，则返回键盘ASCII码对应的十进制数
cv2.waitKey(1) 

按space 键，拍照
按q键退出

import cv2
import time
import os

def make_photo(n=None):
    """
        n:连续拍照n张
    """
    #打开摄像头
    cap = cv2.VideoCapture(0)
    
    if n is None:
        #默认拍一张照片
        #空格键，拍照
        #q键 退出
        while True:
            #捕获一帧的数据
            ret, frame = cap.read()

            if ret:
                #默认不阻塞
                cv2.imshow("picture", frame) 
            
            #阻塞等待输入按键， 返回按键对应的十进制
            #key = cv2.waitKey()
            # print("key:", key, chr(key))
            while True:
                key = cv2.waitKey()
                
                #q键退出，不拍照
                if key == 113:
                    break
                elif key == 32:
                    #数据帧写入图片中
                    label = 1
                    while os.path.exists("%d.png"%label):
                        label += 1
                    cv2.imwrite("%d.png"%label, frame)
                    continue

            break
        
    else:
        #n连拍
        count = 0
        while count < n:
            ret, frame = cap.read()
            if ret:
                cv2.imshow("picture", frame)
                time.sleep(1.5)
                cv2.imwrite("%d.png"%count, frame)
            count += 1
    
    #释放摄像头
    cap.release()
    cv2.destroyAllWindows()

if __name__ == "__main__":
    
    make_photo(5)

def make_video():
    """使用opencv录像"""
    # 默认的摄像头
    cap = cv2.VideoCapture(0)  
    # 指定视频代码
    fourcc = cv2.VideoWriter_fourcc(*"DIVX")
    writer = cv2.VideoWriter('video.avi', fourcc, 20.0, (640, 480))
    while cap.isOpened():
        ret, frame = cap.read()
        if ret:
            writer.write(frame)
            #
            cv2.imshow('frame', frame)
            # 等待按键q操作关闭摄像头
            if cv2.waitKey(1)&0xff == 113:
                break
        else:
            break

    cap.release()
    writer.release()
    cv2.destroyAllWindows()