2019-06-22（day003）

import cv2 as cv
import numpy as np
def function():
    img = cv.imread("./image.jpg")
    cv.namedWindow("input", cv.WINDOW_AUTOSIZE)
    cv.imshow("input", img)
    gray_img = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
    cv.namedWindow("gray_image", cv.WINDOW_AUTOSIZE)
    cv.imshow("gray_image", gray_img)
    img1 = np.copy(img)
    img2 = img
    #虽然是在赋值后才做的修改，但是还是会影响img2
    img[100: 200, 200: 300, :] = 0
    cv.imshow("fuzhi", img2)
    cv.imshow("xiugaixiangsu", img)
    img3 = np.zeros(img.shape, img.dtype)
    cv.imshow("np.zeros", img3)
    img4 = np.ones(shape = [512, 512, 3], dtype = np.uint8)
    img4[:, :, 0] = 255
    cv.imshow("np.ones, B_channel=255", img4)
    img5 = np.zeros([512, 512], np.uint8)
    cv.imshow("erweishape", img5)
    
function()
cv.waitKey(0)
cv.destroyAllWindows()