We will be implementing an image sharpening technique used by modern graphical editors, such as GIMP and Photoshop. This suggests that we apply the Gaussian smoothing filter to a copy of an image and subtract the smoothed version from the original image (in a weighted way so that the values of a constant area remain constant).
Let's try to apply sharpening to our image of cats and see the change:
using Images, ImageViewgaussian_smoothing = 1intensity = 1# load an image and apply Gaussian smoothing filterimg = load("sample-images/cats-3061372_640.jpg");imgb = imfilter(img, Kernel.gaussian(gaussian_smoothing));# convert images to Float to perform mathematical operationsimg_array = Float16.(channelview(img));imgb_array
