How to Flip Images Vertically and Horizontally in Julia 📂Julia

How to Flip Images Vertically and Horizontally in Julia

Overview

This section introduces how to vertically or horizontally flip an image in Julia. It might seem intuitive to expect a function like flip in Images.jl, but it’s not present¹. However, such functionality is implemented in the Augmentor.jl package². Considering dependencies, it’s inefficient to use a package just for the flipping feature, so let’s implement it using only built-in functions.

Code

We will use this example image.

Horizontal Flip `rotr90(img')`

Transpose the image and then rotate it 90 degrees with rotr90.

Vertical Flip `reverse(rotr90(img'))`

Flip the horizontally flipped image using the reverse function.

Complete Code

using Images
img = load("seola.png")
flipedH = rotr90(img')
flipedV = reverse(rotr90(img'))

save("seolaH.png", flipedH)
save("seolaV.png", flipedV)

Environment

OS: Windows
julia: v1.10.0