Watermark tamper detection

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I'm doing an invisible watermarking project in C#. On that project, we have to detect what kind of tamper(crop,blur) happen in our watermarked image.(In that case we have watermarked image and watermark image)

For example, insert a watermarked image(It has been blurred) as input,our system have to detect what kind of tamper happen in that image!

Please any one suggest a method for how to accomplish this.!

Thanks in Advance!

Posted 28-Nov-15 3:21am

Kasthuri Gunabalasingam

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BillWoodruff 28-Nov-15 10:07am

What research have you done so far ?

PIEBALDconsult 28-Nov-15 10:59am

Sounds impossible to me.

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George Jonsson · Answer 1 · 2015-11-28T18:55:00

I think you should start with writing down each case of tampering in a list.
Then you need to figure out a method/algorithm to detect each case.
You might find it is impossible or very costly (time) to solve one or more of the cases.

Example:
1. Cropping
Compare size.

2. Blurring
Compare contrast. (maybe)

3. Healing Brush
Parts of image altered.

After that you can start to implement each method one by one.