OpenCV-Python 绘制基本图形

参考

• Drawing Functions in OpenCV

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代码

import numpy as np
import cv2

img = np.zeros((512, 512, 3), np.uint8) # 创建一张黑色的图像

img = cv2.line(img, (0, 0), (511, 511), (255, 0, 0), 5) # 从img的(0,0)坐标到(511, 511)坐标以(255, 0, 0)的颜色画5px的直线
img = cv2.rectangle(img, (384, 0), (510, 128), (0, 255, 0), 3) # 画矩形
img = cv2.circle(img, (447, 63), 63, (0, 0, 255), -1) # 画圆，(447,63)圆心，63半径，(0,0,255)颜色，-1填充
img = cv2.ellipse(img, (256, 256), (100, 50), 0, 0, 360, (0, 255, 255), -1) #画椭圆

# 画多边形
pts = np.array([[10, 5], [20, 30], [70, 20], [50, 10]], np.int32)
pts = pts.reshape((-1, 1, 2))
img = cv2.polylines(img, [pts], True, (0, 150, 255))

# 画文字
font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(img, 'Hello OpenCV', (30, 400), font, 1, (255, 255, 255), 2, cv2.LINE_AA)

cv2.imshow('Draw', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

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效果图