Draw a line on an image using OpenCV

In this program, we will draw a simple line on an image using the OpenCV function line().

Original Image

Algorithm

Step 1: Import cv2. Step 2: Read the image using imread(). Step 3: Get the dimensions of the image using the image.shape method. Step 4: Define starting point of the line. Step 5: Define the end point of the line. Step 6: Define the thickness of the line. Step 7: Draw the line using the cv2.line() function and pass Step 3 to Step 4 as parameters.

Example Code

import cv2 image = cv2.imread('testimage.jpg') height, width, channels = image.shape startpoint = (0, 0) endpoint = (height, width) thickness = 9 color = (255, 0, 0) image = cv2.line(image, startpoint, endpoint, color, thickness) cv2.imshow('Line', image)

Output

Explanation

As you can see, a blue line is drawn on the image.