根据您给的文本内容，

1. 打开图像文件

python import cv2

img = cv2.imread cv2.imshow cv2.waitKey cv2.destroyAllWindows

2. 图像滤波和二值化

python import cv2 import numpy as np

img = cv2.imread

img = cv2.medianBlur

ret, th1 = cv2.threshold th2 = cv2.adaptiveThreshold th3 = cv2.adaptiveThreshold

cv2.imshow cv2.imshow cv2.imshow cv2.imshow cv2.waitKey cv2.destroyAllWindows

3. 形态学操作

kernel = np.ones, np.uint8)

erosion = cv2.erode

dilation = cv2.dilate

opening = cv2.morphologyEx

4. 图像旋转

rows, cols = img.shape

M = cv2.getRotationMatrix2D, -45, 1)

dst = cv2.warpAffine)

5. 绘制图形

python import numpy as np import cv2

cv2.rectangle, , , 2)

cv2.circle, 30, , 2)

6. 图像缩放

res = cv2.resize