Add 5

5/1.py

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+import cv2 as cv
+import numpy as np
+import matplotlib.pyplot as plt
+
+plt.rcParams["font.sans-serif"] = ["SimSun"]
+
+img = cv.imread(r"img\alphabet.jpg", cv.IMREAD_GRAYSCALE)
+
+dx = dy = 50
+rows, cols = img.shape[:2]
+M1 = np.float32([[1, 0, dx], [0, 1, dy]])  # type: ignore
+dst1 = cv.warpAffine(img, M1, (cols, rows))  # type: ignore
+
+M2 = cv.getRotationMatrix2D((cols / 2, rows / 2), 30, 1)
+dst2 = cv.warpAffine(img, M2, (cols, rows))
+
+M3 = np.float32([[1, 0, 0], [0, -1, rows]])  # type: ignore
+dst3 = cv.warpAffine(img, M3, (cols, rows))  # type: ignore
+
+plt.figure()
+plt.subplot(141)
+plt.imshow(img, cmap="gray")
+plt.title("待处理灰度图像")
+plt.axis("off")
+plt.subplot(142)
+plt.imshow(dst1, cmap="gray")
+plt.title("平移变换")
+plt.axis("off")
+plt.subplot(143)
+plt.imshow(dst2, cmap="gray")
+plt.title("旋转 30 度")
+plt.axis("off")
+plt.subplot(144)
+plt.imshow(dst3, cmap="gray")
+plt.title("垂直镜像")
+plt.axis("off")
+plt.tight_layout()
+plt.show()