Python OpenCV cv2.line()方法用法介绍

OpenCV的Python是旨在解决计算机视觉问题的Python绑定库。cv2.line()方法用于在任何图像上绘制一条线。

语法：cv2.line(图像, 起点, 终点, 颜色, 厚度)参数：图像：这是要在其上绘制线条的图像。 start_point：线的起始坐标。坐标表示为两个值的元组, 即(X坐标值, Y坐标值)。 end_point：是直线的终点坐标。坐标表示为两个值的元组, 即(X坐标值, Y坐标值)。 color：它是要绘制的线条的颜色。对于BGR, 我们传递一个元组。例如：(255, 0, 0)为蓝色。粗细：是线条的粗细(以像素为单位)。返回值：返回图像。

用于以下所有示例的图像：

范例1：

# Python program to explain cv2.line() 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 (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)

输出如下：

范例2：

# Python program to explain cv2.line() 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 (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)

输出如下：

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