Python OpenCV | cv2.line()方法
原文:https://www.geesforgeks.org/python-opencv-cv2-line-method/
OpenCV-Python 是一个 Python 绑定库，旨在解决计算机视觉问题。cv2.line()方法用于在任意图像上画线。
语法: cv2.line(图像、起点、终点、颜色、厚度)
参数: 图像:就是要画线的图像。 起点:是直线的起始坐标。坐标表示为两个值的元组(即 X 坐标值、 Y 坐标值)。 终点: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)。 颜色:是要画的线的颜色。对于 BGR ，我们传递一个元组。例如:(255，0，0)代表蓝色。 厚度:是 px 中线条的厚度。
返回值:返回图像。
图像用于以下所有示例:
示例#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)
输出:
例 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)
输出:
