opencv3.0第一天读取摄像头和图片大小类型

import cv2 as cv
import numpy as np
def video_demo():        ##调用摄像头
    capture = cv.VideoCapture(0)
    while(True):
        capture = cv.VideoCapture(0)
        while (True):
            ret, frame = capture.read()
            frame = cv.flip(frame, 1)
            cv.imshow("video", frame)
            c = cv.waitKey(50)
            if c == 27:
                break

def get_image_info(contours):          ##读取图片大小
    print(type(contours))
    print(contours.shape)
    print(contours.size)
    print(contours.dtype)
    pixel_data = np.array(contours)
    print(pixel_data)




print("--------- Python OpenCV Tutorial ---------")
src = cv.imread("C:/Users/weiqiangwen/Desktop/sest/contours.png")
cv.namedWindow("input contours",cv.WINDOW_AUTOSIZE)
cv.imshow("contours", src)
cv.imwrite("C:/Users/weiqiangwen/Desktop/sest/baocun/contours.png", src)
get_image_info(src)
video_demo()
cv.waitKey(0)

cv.destroyAllWindows()