funsec mailing list archives
Re: Image forensics
From: Martin Tomasek <tomasek () ufe cz>
Date: Mon, 28 Dec 2009 11:20:10 +0100
Imri Goldberg napsal(a):
Since seam-carving was all the rage back then, we tried to think what would be a good algorithm to detect seam carving when used to remove parts of an image. The idea we had was that since seam carving removes parts of the image with low gradients, you could look for parts of the image that don't have low gradients, even though "they should".
I think seam-carving produce unnaturally looking images. I think algorithms that catches distortion or repetition would catch it.
We never put this one to the test, but more ideas to automate photo forgery detection are always interesting.
I like wavelet-based algorithms the most. "Below we describe three such applications: (1) detecting hidden messages (steganography); (2) differentiating between computer graphic and natural images; and (3) detecting re-broadcast attacks against biometric identification systems." http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.66.3047&rep=rep1&type=pdf _______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
Current thread:
- Image forensics Rob, grandpa of Ryan, Trevor, Devon & Hannah (Dec 27)
- Re: Image forensics Dan Kaminsky (Dec 27)
- Re: Image forensics Martin Tomasek (Dec 28)
- Re: Image forensics Imri Goldberg (Dec 28)
- Re: Image forensics Martin Tomasek (Dec 28)
- Re: Image forensics Martin Tomasek (Dec 28)
- Re: Image forensics Dan Kaminsky (Dec 27)
- Re: Image forensics Martin Tomasek (Dec 28)
- Re: Image forensics Gadi Evron (Dec 28)
- <Possible follow-ups>
- Re: Image forensics Dr. Neal Krawetz (Dec 28)
- Re: Image forensics Dan Kaminsky (Dec 28)
- Re: Image forensics Dr. Neal Krawetz (Dec 28)