Python OpenCV cv2.circle()用法及代碼示例

OpenCV-Python是旨在解決計算機視覺問題的Python綁定庫。cv2.circle()方法用於在任何圖像上繪製圓。

用法： cv2.circle(image, center_coordinates, radius, color, thickness)

參數：
image:它是要在其上繪製圓的圖像。
center_coordinates：它是圓的中心坐標。坐標表示為兩個值的元組，即(X坐標值，Y坐標值)。
radius:它是圓的半徑。
color:它是要繪製的圓的邊界線的顏色。對於BGR，我們通過一個元組。例如：(255，0，0)為藍色。
thickness:它是圓邊界線的粗細像素。厚度-1像素將以指定的顏色填充矩形形狀。

返回值：它返回一個圖像。

用於以下所有示例的圖像：

示例1:

# Python program to explain cv2.circle() method  
    
# importing cv2  
import cv2  
    
# path  
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png'
    
# Reading an image in default mode 
image = cv2.imread(path) 
    
# Window name in which image is displayed 
window_name = 'Image'
   
# Center coordinates 
center_coordinates = (120, 50) 
  
# Radius of circle 
radius = 20
   
# Blue color in BGR 
color = (255, 0, 0) 
   
# Line thickness of 2 px 
thickness = 2
   
# Using cv2.circle() method 
# Draw a circle with blue line borders of thickness of 2 px 
image = cv2.circle(image, center_coordinates, radius, color, thickness) 
   
# Displaying the image  
cv2.imshow(window_name, image)

輸出：

示例2:
使用-1 px的厚度用紅色填充矩形。

# Python program to explain cv2.circle() method  
    
# importing cv2  
import cv2  
    
# path  
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png'
    
# Reading an image in default mode 
image = cv2.imread(path) 
    
# Window name in which image is displayed 
window_name = 'Image'
   
# Center coordinates 
center_coordinates = (120, 100) 
  
# Radius of circle 
radius = 30
   
# Red color in BGR 
color = (0, 0, 255) 
   
# Line thickness of -1 px 
thickness = -1
   
# Using cv2.circle() method 
# Draw a circle of red color of thickness -1 px 
image = cv2.circle(image, center_coordinates, radius, color, thickness) 
   
# Displaying the image  
cv2.imshow(window_name, image)

輸出：

相關用法

注：本文由純淨天空篩選整理自Rajnis09大神的英文原創作品 Python OpenCV | cv2.circle() method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。