Detecting Video & Audio Tampering 39
* * Beatles-Beatles writes "Dartmouth professor Hany Farid already devised software tools to detect when someone has tampered with digital photos. His next challenge: determining whether video or audio files have been retouched. "
Umm... (Score:4, Funny)
Nevermind (Score:2)
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Depending on who is doing the tampering, that doesn't necessarily work.
You can thank the Chinese for blabbing it to everyone.
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Reuters, an international news wire service, caught heat by publishing a Beirut battle photo that contained an extra plume of smoke for dramatic effect. (Farid's software helped reveal that enhancement.)
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they needed software to detect this? the 'enhancements' were so blatantly obvious that anyone that's ever used photoshop would have been able to see them...
hilarious
National Inquirer, Beware (Score:2)
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Re:No can do (Score:4, Funny)
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And might I mention that this work is more in the fields of mathematics or signals filtering/processing than acoustics? (BTW, who gives degrees in acoustics? I know of ME's with specialization in acoustics engineering, but that's a whole different field than this signals analysis)
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OK, hopefully that clarifies a little something or two. As for finding fiddled with files (yes, that's another synonym) programmatically is going to require data processing by software more in line with that of signals processing of the sort done by... wait for it... signals processing applications, not "acoustics processing applications".
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Of course it is, that's what the data represents. But we're working on the data only. Which goes right back to signals processing. Because the processes in the article do not recreate the picture/movie/audio for examination, what they do is look for deviations in the data from what's expected. i.e., pixels that don't match/line
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MIT has an ocean acoustics [mit.edu] program. That at least used to deal to a large extent with submarine detection, with lots of military research money available. MIT also has an acoustics and vibration lab [mit.edu]. And Amar Bose [wikipedia.org], who may well have designed your loud speakers, taught acoustics at MIT until his retirement in 2000. I took his intro acoustics course many years ago. I think that he may still teach a course. He is still listed [mit.edu] in the MIT directory.
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Funny thing is when we see the guy meticulously laying everything out for the test recording we have a policeman laying on the bed shooting a gun into the ceiling... Funny, but I though the dead person fired a gun into her head.
And they won
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All the time (Score:2)
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i'd love it if american anime publishers would plan on an "uncut DVD" version from the start so that, once there's a big enough fan base, they can sell the real thing through niche market and online. it'
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Good point; however, it's merely a symptom of another problem: the perception of 'animation = for kids' on this side of the Pac. To be fair, some projects (such as Cool World have attempted to break out of that mold...
Yeah, why don't they? This is already done with quite a few movies, as I recall. And the popularity of fansubs lea
security through obscurity (Score:4, Interesting)
It just doesn't strike me as a terribly reliable way to ID a picture's origin. Might as well rely on the EXIF data.
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A real world image will have a lot of artifacts tying it back to a particular camera make and model, and a base noise level that is a virtual fingerprint identifiable
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Yes.
Just take a picture with the same camera. There may well be signs the image has been manipulated, but in terms of tying elements of a photograph back to an individual camera, why not just
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Even that might not be good enough. The camera will have to be in the same orientation, as that will affect both JPEG quantization and Moire artifacts. You may need the "paste-in" subject to be at the same part of the image sensor as he'll be in the final image. And it still has to be edited to match the other attributes -- depth of field, lighting, and focus, all of which are features experts co
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Simple. (Score:5, Funny)
This formula can also be adapted to Lindsay Lohan, but hasn't been tested on Tara Reid or others yet.
The Four Horsemen of the Infocalypse (Score:2)
A story on detecting photomanipulation apparently wasn't interesting in and of itself, so the author felt the need to drag in one of the Four Horsemen of the Infocalypse [wikipedia.org]: "Child pornographers also employ photo retouching to skirt felony laws."
No amount of photo retouching makes sexual abuse of a child legal. The only way I can see to "skirt" the law would be to transform the images so they plausible look artificial (Court rulings have upheld that as long as no children are involved, it's protected by the
Edit adult to look like a child (Score:2)
As sick as these people are, I don't see why we should throw them in jail for that...
Melissa
Not always necessary. (Score:1)
Like we really needed the software to show that a Photoshop clone tool was used. Nearly every person who saw it said it looked fake; even people who don't know how to use Photoshop said it looked "wrong".