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Draw a Line in OpenCV and Python beyond given points

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by vigneshchennai74 dot icon Updated: Feb 1, 2023

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OpenCV is a computer vision library written in C++ and widely used for image and video processing. It offers a range of features for working with photographs and movies, including the ability to load and save images, use filters, find edges, and find and track objects. In collaboration, applications involving image and video processing are frequently created using Python and OpenCV. This combination enables you to develop solid and adaptable programs that can address various computer vision issues.  


In our work as developers, we frequently must read and rotate the photos in our applications to complete various image processing activities, such as recognition, upload, augmentation, training, and many more. There are numerous libraries for Python that enable working with images. Python has features for manipulating, enhancing, and creating more images. In addition to using additional OpenCV functions to apply other transformations to the image, such as scaling, cropping, and applying filters, you can modify the angle of rotation and the image's size to get the desired effect.  


Here is an example of how we can draw a line beyond the second point using opencv


Preview of the output that you will get on running this code from your IDE

CODE

In this solution we use the numpy and open cv library

Draw a Line in OpenCV and Python beyond given points

PythondotLines of Code : 52dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
import cv2
import numpy as np

sizeofscr = 500

blank_image = np.zeros((sizeofscr,sizeofscr,3), np.uint8)

p1 = (290,230)
p2 = (100,100)

blank_image = cv2.circle(blank_image, p1, 10, (255, 0, 0), 2)
blank_image = cv2.circle(blank_image, p2, 10, (255, 0, 0), 2)

fx = abs(p1[0] - p2[0])
fy = abs(p1[1] - p2[1])

if (p1[0]+p1[1]) > (p2[0]+p2[1]):
    if fx < fy:
        temp = abs(sizeofscr - p1[1]) / fy

        fx = (temp * fx) + p1[0]
        fy = (temp * fy) + p1[1]

        blank_image = cv2.line(blank_image,(int(fx),int(fy)),p2,(0,0,255),3)

    else:
        temp = abs(sizeofscr - p1[0]) / fx
    
        fx = (temp * fx) + p1[0]
        fy = (temp * fy) + p1[1]
    
        blank_image = cv2.line(blank_image,(int(fx),int(fy)),p2,(0,0,255),3)    
else:
    if fx < fy:
        temp = abs(sizeofscr - p1[1]) / fy

        fx = (temp * fx) + p1[0]
        fy = (temp * fy) + p1[1]

        blank_image = cv2.line(blank_image,(int(fx),int(fy)),p1,(0,0,255),3)
    else:
        temp = abs(sizeofscr - p1[0]) / fx
    
        fx = (temp * fx) + p1[0]
        fy = (temp * fy) + p1[1]
    
    
        blank_image = cv2.line(blank_image,(int(fx),int(fy)),p1,(0,0,255),3)    

cv2.imshow("test",blank_image)
cv2.waitKey(0)
  1. Copy the code using the "Copy" button above, and paste it in a Python file in your IDE.
  2. Import open Cv library and Numpy library.
  3. Modify the name and Length of the points.
  4. Run the file to draw a line.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


ifound this code snippet by searching for "Draw a line in open cv and python beyond given points" in kandi. You can try any such use case!

Dependent Library

numpyby numpy

Python doticonstar image 23755 doticonVersion:v1.25.0rc1doticon
License: Permissive (BSD-3-Clause)

The fundamental package for scientific computing with Python.

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            numpyby numpy

            Python doticon star image 23755 doticonVersion:v1.25.0rc1doticon License: Permissive (BSD-3-Clause)

            The fundamental package for scientific computing with Python.
            Support
              Quality
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                  License
                    Reuse

                      opencvby opencv

                      C++ doticonstar image 69456 doticonVersion:4.7.0doticon
                      License: Permissive (Apache-2.0)

                      Open Source Computer Vision Library

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                                opencvby opencv

                                C++ doticon star image 69456 doticonVersion:4.7.0doticon License: Permissive (Apache-2.0)

                                Open Source Computer Vision Library
                                Support
                                  Quality
                                    Security
                                      License
                                        Reuse

                                          If you do not have OpenCV and numpy that is required to run this code, you can install it by clicking on the above link and copying the pip Install command from the OpenCV page in kandi.

                                          You can search for any dependent library on kandi like OpenCV and numpy

                                          Environment Test

                                          I tested this solution in the following versions. Be mindful of changes when working with other versions


                                          1. The solution is created and executed in python version 3.7.15 .
                                          2. The solution is tested on OpenCV 4.6.0 version
                                          3. The solution is tested on numpy 1.21.6


                                          Using this solution, we are going to draw a line beyond the second given point using the OpenCv library and numpy library in Python with simple steps. This process also facilities an easy to use, hassle free method to create a hands-on working version of code which would help us draw a image in Python

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