import numpy as np

img = np.array([
    [255, 255, 0,   0],
    [255, 255, 0,   0],
    [0,   0,   255, 255],
    [0,   0,   255, 255]
], dtype=np.uint8)

white_count = np.sum(img == 255)
black_count = np.sum(img == 0)
print(f"白色像素数量：{white_count}")
print(f"黑色像素数量：{black_count}")

img_flip = np.fliplr(img)
print("\n水平翻转后的图像：")
print(img_flip)

img_rot90 = np.fliplr(img.T)
print("\n逆时针旋转90度后的图像：")
print(img_rot90)