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How to Display Multiple Images in One Window using OpenCV Python?

  • Difficulty Level : Basic
  • Last Updated : 17 Dec, 2020

Prerequisites: Opencv

In this article, we will show how to display Multiple Images In One window using OpenCV in Python.

Approach 

  • Import module
  • Load the Multiple images using cv2.imread()
  • Concatenate the images using concatenate(), with axis value provided as per orientation requirement
  • Display all the images using cv2.imshow()
  • Wait for keyboard button press using cv2.waitKey()
  • Exit window and destroy all windows using cv2.destroyAllWindows()

Functions Used

  • cv2.imread(): reads an image file from the given specific location
  • concatenate((image1,image2), axis): concatenates multiple images along a given mentioned axis (horizontal or vertical), The value of axis is given as 1 for combining them horizontally and 0 for combining them vertically.
  • cv2.imshow(): displays an image in a window
  • cv2.waitKey(): is a keyboard binding function. Its argument is the time in milliseconds. The function waits for specified milliseconds for any keyboard event.
  • cv2.destroyAllWindows(): If you have multiple windows open and you do not need those to be open, you can use cv2.destroyAllWindows() to close those all.

Program:

Python3




import cv2
import numpy as np
  
# Read First Image
img1 = cv2.imread('GFG.png')
  
# Read Second Image
img2 = cv2.imread('GFG.png')
  
  
# concatanate image Horizontally
Hori = np.concatenate((img1, img2), axis=1)
  
# concatanate image Vertically
Verti = np.concatenate((img1, img2), axis=0)
  
cv2.imshow('HORIZONTAL', Hori)
cv2.imshow('VERTICAL', Verti)
  
cv2.waitKey(0)
cv2.destroyAllWindows()

Input:



GFG.png

Output:

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