opencv 튜토리얼

import cv2
import numpy as np
from matplotlib import pyplot as plt

# # Load an color image in grayscale# img = cv2.imread('lena.jpg',0)# cv2.imshow('image', img)# cv2.waitKey(0)# cv2.destroyAllWindows()# cv2.imwrite('lena.png', img)## plt.imshow(img, cmap = 'gray', interpolation='bicubic')# plt.xticks([]), plt.yticks([])# plt.show()
# # Drawing Line#Create a black imageimg = np.zeros((512,512,3), np.uint8)

#Draw a diagonal blue line with thickness of 5pximg = cv2.line(img, (0,0), (511,511),(255,0,0), 5)

img = cv2.circle(img, (447,63), 63, (0,0,255), -1)

img = cv2.ellipse(img, (256,256),(100,50), 0, 0, 180,255,-1)

font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(img,'opencv', (10,500), font, 4, (255,255,255),2,cv2.LINE_AA)

cv2.imshow('image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

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cv2.namedWindow('img', cv2.WINDOW_AUTOSIZE)

for i in range( ):

    cv2.imshow('img', img )
    key = cv2.waitKey(0)
    cv2.destroyAllWindows()
    if key==27:
        break