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

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')


# concatenate image Horizontally
Hori = np.concatenate((img1, img2), axis=1)

# concatenate 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: