1.绘制直线

cv.line(img, (0, 0), (511, 511), (255, 0, 0), 5)

2.绘制圆形

cv.circle(img, (256, 256), 60, (0, 0, 255), -1) 

3.绘制矩形

cv.rectangle(img, (100, 100), (400, 400), (0, 255, 0), 5)

4.向图片中添加文字

cv.putText(img, "hello", (100, 150), cv.FONT_HERSHEY_COMPLEX, 5, (255, 255, 255), 3, )

5.代码展示

import numpy as np
import cv2 as cv
import matplotlib.pyplot as plt

# 1.创建图像
img = np.zeros((512, 512, 3), np.uint8)

# 2.绘制图形
cv.line(img, (0, 0), (511, 511), (255, 0, 0), 5)  # 直线
cv.circle(img, (256, 256), 60, (0, 0, 255), -1)  # 圆形
cv.rectangle(img, (100, 100), (400, 400), (0, 255, 0), 5)  # 方形
cv.putText(img, "hello", (100, 150), cv.FONT_HERSHEY_COMPLEX, 5, (255, 255, 255), 3, )

# 3.显示结果
plt.imshow(img[:, :, ::-1])
plt.show()