sharpening picture using unsharp - please check my code

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Hasbullah Hady 2011-12-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/22810-sharpening-picture-using-unsharp-please-check-my-code

I have a grayscale picture, uint8 jpeg. The picture is about a blurred tomato. I tried to do some unsharp, I tried to blur it, take it edges, and add to the original one. But it seems different. Im using matlab 7.9.0(r2009b)

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blur_filter = [1/9 1/9 1/9; 1/9 1/9 1/9; 1/9 1/9 1/9];
tomato = imread('tomato.jpg');
blur_filter = blur_filter / sum(sum(blur_filter));
blur_tomato = imfilter(tomato, blur_filter);
edge_filter = [-1,-1,-1;-1,8,-1;-1,-1,-1];
edge_tomato=imfilter(blur_tomato, edge_filter);
sharp_tomato = tomato + edge_tomato;
subplot(2,2,1), image(tomato), title('Original tomato');
subplot(2,2,2), image(blur_tomato), title('Blur tomato');
subplot(2,2,3), image(edge_tomato), title('The edge taken from the 
blur');
subplot(2,2,4), image(sharp_tomato), title('Sharp tomato');
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