#练习1----------
import numpy as np
image=np.array([
    [100,150, 200],
    [80, 120, 180],
    [60, 90,  140]
],dtype=np.uint8)
print("原图:")
print(image)
darker=image-20
print(darker)
top_left=image[0:2, 0:2]
print(top_left)
flipped=np.fliplr(image)
print(flipped)
#练习2-----------
import numpy as np
image=np.array([
    [255, 255,  0,   0],
    [255, 255,  0,   0],
    [  0,  0, 255, 255],
    [  0,  0, 255, 255]
],dtype=np.uint8)

#练习3-----------
import numpy as np
feature_map1=np.array([[1, 0, 1], [0, 1, 0], [1, 0, 1]])
feature_map2=np.array([[1, 1, 1], [1, 0, 0], [1, 0, 0]])

vector1=feature_map1.flatten()
vector2=feature_map2.flatten()

print("vector1", vector1)
print("vector2", vector2)