OpenCV-Python系列·第十六集：打開攝像頭

Tip：通過攝像頭獲取信息。

# -*- coding: utf-8 -*-
"""
Spyder Editor

This is a temporary script file.
"""

import cv2

#獲取默認攝像頭
cap = cv2.VideoCapture(0)
#判斷攝像頭是否打開
if not cap.isOpened():
    raise IOError('Cannot open webcam!')
#無限循環顯示
while True:
    #每一幀frame
    ret,frame = cap.read()
    #擴大1.5倍顯示
    frame = cv2.resize(frame,None,fx = 1.25,fy = 1.05,
                       interpolation = cv2.INTER_CUBIC)
    cv2.namedWindow('Video',cv2.WINDOW_FULLSCREEN)
    cv2.imshow('Video',frame)
    #等待鍵盤響應.按下ESC，退出。
    key = cv2.waitKey(1)
    if key & 0xFF == 27:
        break
#釋放資源
cap.release()
#關閉窗口
cv2.destroyAllWindows()