import cv2 as cv
import numpy as np

def video_demo():#读取视频
    capture = cv.VideoCapture(0)
    while(True):
        ret, frame = capture.read()
        frame = cv.flip(frame, 1)#如果没有这一句，左右会颠倒
        cv.imshow("video", frame)
        c = cv.waitKey(50)
        if c == 27:
            break


def get_image_info(image):
    print(type(image))#imread读取到的数据类型是numpy,ndarray
    print(image.shape)
    print(image.size)
    print(image.dtype)
    pix_data = np.array(image);#获取像素数据
    print(pix_data)


src = cv.imread(r‘H:\coding\opencvpicture\coins.jpg‘)
cv.namedWindow("input image", cv.WINDOW_AUTOSIZE)
cv.imshow("input image", src)
gray = cv.cvtColor(src, cv.COLOR_BGR2GRAY)#获得灰度图像
get_image_info(src)#调用函数，获取通道数据
cv.imwrite(r"H:\coding\python_opencv_tutorial_codes\practice\result.png", gray)#存储图像到指定位置
#video_demo()
cv.waitKey(0)
cv.destroyAllWindows()