This is a non-linear transform defined in the scikit-image documentation. The next code snippet shows how to use the swirl() function to implement the transform, where strength is a parameter to the function for the amount of swirl, radius indicates the swirl extent in pixels, and rotation adds a rotation angle. The transformation of radius into r is to ensure that the transformation decays to ≈ 1/1000th ≈ 1/1000th within the specified radius:
im = imread("../images/parrot.png")swirled = swirl(im, rotation=0, strength=15, radius=200)plt.imshow(swirled)plt.axis('off')plt.show()
The next figure shows the output image generated with swirl transformation by running the previous code snippet:
