Python OpenCV cv2.rectangle()方法绘制矩形示例

2021年4月7日18:54:42 发表评论 999 次浏览

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

Python OpenCV绘制矩形语法:
cv2.rectangle(image, start_point, end_point, color, thickness)
参数:
image:这是要在其上绘制矩形的图像。
start_point: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:矩形的终点坐标。坐标表示为两个值的元组, 即(X坐标值, Y坐标值)。
color:是要绘制的矩形的边界线的颜色。对于BGR, 我们传递一个元组。例如:(255, 0, 0)为蓝色。
thickness:是矩形边框线的粗细(以像素为单位)。 -1 px的厚度将用指定的颜色填充矩形。
返回值:返回图像。

用于以下所有示例的图像:

Python OpenCV  cv2.rectangle()方法绘制矩形

Python OpenCV cv2.rectangle示例1:

# Python program to explain cv2.rectangle() method 
   
# importing cv2 
import cv2 
   
# path 
path = r 'C:\Users\Rajnish\Desktop\lsbin\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)

输出如下:

Python OpenCV  cv2.rectangle()方法绘制矩形

Python OpenCV绘制矩形示例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\lsbin\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)

输出如下:

Python OpenCV | cv2.rectangle()方法绘制矩形

以上就是Python OpenCV的cv2.rectangle()方法绘制矩形示例,如有问题,请在下方评论


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