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Python OpenCV | cv2.line() method

  • Last Updated : 13 Aug, 2019

OpenCV-Python is a library of Python bindings designed to solve computer vision problems.cv2.line() method is used to draw a line on any image.

Syntax: cv2.line(image, start_point, end_point, color, thickness)

Parameters:
image: It is the image on which line is to be drawn.
start_point: It is the starting coordinates of line. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
end_point: It is the ending coordinates of line. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
color: It is the color of line to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color.
thickness: It is the thickness of the line in px.

Return Value: It returns an image.

Image used for all the below examples:

Example #1:




# Python program to explain cv2.line() 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 (0, 0)
# represents the top left corner of image
start_point = (0, 0)
  
# End coordinate, here (250, 250)
# represents the bottom right corner of image
end_point = (250, 250)
  
# Green color in BGR
color = (0, 255, 0)
  
# Line thickness of 9 px
thickness = 9
  
# Using cv2.line() method
# Draw a diagonal green line with thickness of 9 px
image = cv2.line(image, start_point, end_point, color, thickness)
  
# Displaying the image 
cv2.imshow(window_name, image) 

Output:

Example #2:




# Python program to explain cv2.line() 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 (225, 0)
# represents the top right corner of image
start_point = (225, 0)
  
# End coordinate, here (0, 225)
# represents the bottom left corner of image
end_point = (0, 225)
  
# Black color in BGR
color = (0, 0, 0)
  
# Line thickness of 5 px
thickness = 5
  
# Using cv2.line() method
# Draw a diagonal black line with thickness of 5 px
image = cv2.line(image, start_point, end_point, color, thickness)
  
# Displaying the image 
cv2.imshow(window_name, image) 

Output:


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