How to join two images horizontally and vertically using OpenCV Python?
Have you ever wanted to combine two images together, either horizontally or vertically, using OpenCV and Python? Combining images is a necessary task in many computer vision and image processing applications. In this article, we will discuss and demonstrate how to join two images horizontally and vertically using OpenCV and Python.
Joining two images horizontally
Joining images horizontally means that we want our two images to appear side-by-side. To do this in OpenCV, we can use the hconcat
function. The function takes in a tuple of images as a parameter and returns a joined image.
Here is sample code that demonstrates how to horizontally join two images in OpenCV:
import cv2
# Load the two images
image1 = cv2.imread('image1.jpg')
image2 = cv2.imread('image2.jpg')
# Combine the two images horizontally
joined_image = cv2.hconcat([image1, image2])
# Display the result
cv2.imshow('Joined image', joined_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
Joining two images vertically
Joining images vertically means that we want our two images to appear one on top of the other. To do this in OpenCV, we can use the vconcat
function. The function takes in a tuple of images as a parameter and returns a joined image.
Here is sample code that demonstrates how to vertically join two images in OpenCV:
import cv2
# Load the two images
image1 = cv2.imread('image1.jpg')
image2 = cv2.imread('image2.jpg')
# Combine the two images vertically
joined_image = cv2.vconcat([image1, image2])
# Display the result
cv2.imshow('Joined image', joined_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
Joining images of different sizes
If we have two images of different sizes, we can still join them together using the resize
function in OpenCV. The resize
function allows us to resize an image to a desired size.
Here is sample code that demonstrates how to join two images of different sizes horizontally in OpenCV:
import cv2
# Load the two images
image1 = cv2.imread('image1.jpg')
image2 = cv2.imread('image2.jpg')
# Resize the first image to the same height as the second image, then join them horizontally
resized_image1 = cv2.resize(image1, (image2.shape[1], image2.shape[0]))
joined_image = cv2.hconcat([resized_image1, image2])
# Display the result
cv2.imshow('Joined image', joined_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
Similarly, we can join two images of different sizes vertically by resizing the first image to the same width as the second image using the resize
function.
Conclusion
Joining two images horizontally or vertically is a common image processing task. In this article, we demonstrated how to use OpenCV and Python to easily join two images together. By using the hconcat
and vconcat
functions, we can combine images of the same size. Additionally, we can use the resize
function to resize images of different sizes to join them together. We hope this article was helpful and informative for your image processing needs.