Sharpen an Image Using the GPU

This example shows how to sharpen an image using gpuArray objects and GPU-enabled functions.

Read the image, and send it to the GPU using the gpuArray function.

image = gpuArray(imread("peppers.png"));

Convert the image to double arrays, and apply convolutions to obtain the gradient image. Then, using the gradient image, sharpen the image by a factor of amount.

dimage = im2double(image); 
gradient = convn(dimage,ones(3)/9,"same") - convn(dimage,ones(5)/25,"same");
amount = 5;
sharpened = dimage + amount.*gradient;

Resize, plot and compare the original and sharpened images.

imshow(imresize([dimage,sharpened],0.7));
title("Original image (left) vs sharpened image (right)");