opencv——python(1)

1. 导入opencv模块

import cv2

2.导入numpy模块

import numpy as np

3.读取当前目录图片

img = cv2.imread("1.jpg")

4.创建图像

emptyImage = np.zeros(img.shape, np.uint8)

5.复制图像

emptyImage2 = img.copy()

6.得到图像副本，并做灰度处理

emptyImage3 = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

7.显示图像

cv2.imshow("EmptyImage", emptyImage)
cv2.imshow("EmptyImage1", img)
cv2.imshow("EmptyImage2", emptyImage2)
cv2.imshow("EmptyImage3", emptyImage3)

8.写入保存图片

cv2.imwrite("./cat2.jpg", img, [int(cv2.IMWRITE_JPEG_QUALITY), 5])
cv2.imwrite("./cat3.jpg", img, [int(cv2.IMWRITE_JPEG_QUALITY), 100])
cv2.imwrite("./cat.png", img, [int(cv2.IMWRITE_PNG_COMPRESSION), 0])
cv2.imwrite("./cat2.png", img, [int(cv2.IMWRITE_PNG_COMPRESSION), 9])

9.窗口等待

cv2.waitKey(0)
cv2.destroyAllWindows()