how can I do sharpening attack?

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Hi, I want to do sharpening attack on image but I do not know how can I do it in matlab. is it any function or code for this?

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Guillaume 2017-1-23

You may want to explain what a sharpening attack is for those of us who've never heard the term. Neither google nor sciencedirect are particularly enlightening on the subject.

I suspect it's something you're going to have to code yourself in any case.

nadia 2017-1-23

sharpening attack is kind of attack that is used in watermarking test like jpeg. I know imsharpen function in matlab do this and enhances edges and changes high and low frequencies in image. but I want to know other functions or code like this that change low frequency band in image?

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