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Python OpenCV cv2.rectangle()用法及代码示例

OpenCV-Python是旨在解决计算机视觉问题的Python绑定库。cv2.rectangle()方法用于在任何图像上绘制矩形。

用法: cv2.rectangle(image, start_point, end_point, color, thickness)

参数:
image:它是要在其上绘制矩形的图像。
start_point:它是矩形的起始坐标。坐标表示为两个值的元组,即(X坐标值,Y坐标值)。
end_point:它是矩形的结束坐标。坐标表示为两个值的元组,即(X坐标值ÿ坐标值)。
color:它是要绘制的矩形的边界线的颜色。对于BGR,我们通过一个元组。例如:(255,0,0)为蓝色。
thickness:它是矩形边框线的粗细像素。厚度-1像素将以指定的颜色填充矩形形状。


返回值:它返回一个图像。

用于以下所有示例的图像:

示例1:

# Python program to explain cv2.rectangle() 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'
  
# Start coordinate, here (5, 5) 
# represents the top left corner of rectangle 
start_point = (5, 5) 
  
# Ending coordinate, here (220, 220) 
# represents the bottom right corner of rectangle 
end_point = (220, 220) 
  
# Blue color in BGR 
color = (255, 0, 0) 
  
# Line thickness of 2 px 
thickness = 2
  
# Using cv2.rectangle() method 
# Draw a rectangle with blue line borders of thickness of 2 px 
image = cv2.rectangle(image, start_point, end_point, color, thickness) 
  
# Displaying the image  
cv2.imshow(window_name, image) 

输出:

示例2:

使用-1 px的厚度用黑色填充矩形。

# Python program to explain cv2.rectangle() method  
    
# importing cv2  
import cv2  
    
# path  
path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png'
    
# Reading an image in grayscale mode 
image = cv2.imread(path, 0) 
    
# Window name in which image is displayed 
window_name = 'Image'
   
# Start coordinate, here (100, 50) 
# represents the top left corner of rectangle 
start_point = (100, 50) 
   
# Ending coordinate, here (125, 80) 
# represents the bottom right corner of rectangle 
end_point = (125, 80) 
   
# Black color in BGR 
color = (0, 0, 0) 
   
# Line thickness of -1 px 
# Thickness of -1 will fill the entire shape 
thickness = -1
   
# Using cv2.rectangle() method 
# Draw a rectangle of black color of thickness -1 px 
image = cv2.rectangle(image, start_point, end_point, color, thickness) 
   
# Displaying the image  
cv2.imshow(window_name, image) 

输出:



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注:本文由纯净天空筛选整理自Rajnis09大神的英文原创作品 Python OpenCV | cv2.rectangle() method。非经特殊声明,原始代码版权归原作者所有,本译文的传播和使用请遵循“署名-相同方式共享 4.0 国际 (CC BY-SA 4.0)”协议。