OpenCV-Python实战(2) —— 使用OpenCV的绘图功能创建OpenCV的徽标

import cv2 as cv
import numpy as np

def draw_opencv_logo():
  logo = cv.imread("./images/opencv-logo-white.png")
  h,w,c = logo.shape
  # 复制一个opencv-logo矩阵，赋值白色
  img = np.zeros_like(logo)
  # img.fill(255)
  # 使用Photoshop测量外径和内径
  max_d = 86
  max_r = int(max_d / 2)
  min_d = 34
  min_r = int(min_d / 2)
  # 使用Photoshop测量各个圆的颜色
  color_red = (68,42,255)
  color_green = (103,218,139)
  color_blue = (255,141,18)
  color_bg = (255,255,255)
  color_black = (0,0,0)

  # 圆心计算
  center_red = (int(w / 2), max_r)
  center_green = (max_r, max_d + max_r - 8)
  center_blue = (w - max_r, max_d + max_r - 8)

  # 顶部红色圆
  cv.circle(img, center_red, max_r, color_red, -1,cv.LINE_AA)
  cv.circle(img, center_red, min_r, color_black, -1,cv.LINE_AA)
  cv.ellipse(img, center_red, (max_r, max_r + 2), 0, 60, 120, color_black, -1,cv.LINE_AA)

  # 左侧绿色圆【椭圆整体旋转240度】
  cv.circle(img, center_green, max_r, color_green, -1,cv.LINE_AA)
  cv.circle(img, center_green, min_r, color_black, -1,cv.LINE_AA)
  cv.ellipse(img, center_green, (max_r, max_r + 2), 240, 60, 120, color_black, -1,cv.LINE_AA)

  # 右侧蓝色圆【椭圆整体旋转180度】
  cv.circle(img, center_blue, max_r, color_blue, -1,cv.LINE_AA)
  cv.circle(img, center_blue, min_r, color_black, -1,cv.LINE_AA)
  cv.ellipse(img, center_blue, (max_r, max_r + 2), 180, 60, 120, color_black, -1,cv.LINE_AA)

  # 绘制下边的文字
  cv.putText(img, "OpenCV", (0, h - 15), cv.FONT_HERSHEY_DUPLEX, 1.5, color_bg,4)

  # 将原图和自绘图放入一张图片
  create_img = np.zeros((h,w*2,3),np.uint8)
  # 左边原图，右边刚刚绘制的图片
  create_img[:h,:w] = logo
  create_img[:h,w:] = img

  cv.imshow('opencv_logo', create_img)
  cv.waitKey(0)
  cv.destroyAllWindows()

if __name__ == "__main__":
  draw_opencv_logo()