Opencv3 Python基础教程2_视频

Opencv 基础教程

用摄像头捕获视频

• 此代码实现了一个用摄像头捕获视频

# -*- coding: utf-8 -*-import numpy as npimport cv2cap = cv2.VideoCapture(0)print cap.get(3)print cap.get(4)cap.set(3,220)cap.set(4,220)while(True):    ret, frame = cap.read()    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)    cv2.imshow('frame', gray)    if cv2.waitKey(1) == ord('q'):        breakcap.release()cv2.destroyAllWindows()

• 使用获取电脑摄像头数据

cap = cv2.VideoCapture(0)

• get(3)和get(4)是获取视频长宽，而set()则是设置视频长宽

print cap.get(3)print cap.get(4)cap.set(3,220)cap.set(4,220)

• ret 是布尔值，若读取成功为TRUE，否则为FLASE，frame为读取的像素，cvtColor()第二个参数为设置图片的显示设置

while(True):    ret, frame = cap.read()    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)    cv2.imshow('frame', gray)    if cv2.waitKey(1) == ord('q'):        breakcap.release()