how image sharpening is perform in matlab?

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Durgesh Naik 2016-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/278522-how-image-sharpening-is-perform-in-matlab

编辑： Durgesh Naik 2016-4-13

please suggest.

% Filter 1
kernel3 = [-1 -1 -1; -1 8 -1; -1 -1 -1]/3;
% Filter the image.  Need to cast to single so it can be floating point
% which allows the image to have negative values.
filteredImage = imfilter(single(im), kernel3);
filteredImage =im2double(filteredImage);
filteredImage =1.5 .*filteredImage;
figure(),imshow(filteredImage);
out1=imadd(im,filteredImage);
figure(), imshow(out1);
Z = imabsdiff(im,out1);
% figure(), 
imtool(Z);