#Deepfakes are everywhere, but #DigitalForensics investigators are fighting back:

[vekkq@social.vivaldi.net]

@FabMusacchio in the first picture, the lines may be off by measurements inaccuracies. a mirror image depends on a perfect mirror on the physical mirror. and the shadows may be off by camera lens distortion.

[kawazoe@transfem.social]

@FabMusacchio@mastodon.social If you think floor tiles are a good indication for parallel lines, you need to watch more CyFy videos

All jokes aside, this is a very good trick to spot AI content, and it still works with the most recent models.

[h3mmy@tech.lgbt]

@JonnyT I like using redirect checkers like WhereGoes, RedirectDetective, etc which I've found to be quite convenient

@NatureMC @ilusenn @FabMusacchio

[ghoppe@mastodon.social]

@seachaint @leadore @leah @f4grx @FabMusacchio in most situations, shadow perspective is apparent when the camera is pointing towards the sun. It’s different if camera is overhead.

[frankiezafe@mastodon.xyz]

@YannC @mathieu_ @AudeCaussarieu je crois que la chaîne qui rentre dans le bras gauche du soldat sur la gauche est un meilleur indice de fake que la perspective inexacte

[naturemc@mastodon.online]

@h3mmy Why should I do that work: I only click and boost posts with real links, that's it. So easy. @JonnyT @ilusenn @FabMusacchio

[mamalake@beige.party]

@FabMusacchio damn, this is why they taught us math? To find the deep fakes posing as truth?

[flop_ysh@hostux.social]

@YannC quand même il y a largement assez de pixel !

[christianschwaegerl@mastodon.social]

@FabMusacchio Perhaps they came to arrest the tiler?

[freagle@mastodon.social]

@FabMusacchio Someone should do this with moon landing videos

[urwumpe@hessen.social]

@FabMusacchio I would be more tolerant in the first example with the soldiers, because many builldings are not build perfectly straight or remain like that. If there is only a small error, it would not be a strong indicator for a fake. Of course, this doesn't apply to the other examples.

[viraptor@cyberplace.social]

@nihilarc
Not just that: lens distortion, uneven lighting, confusing shades, etc. - we'll see lots of people claiming something is genai since it's not perfect, but... the world is not perfect. People are already getting called out for AI writing when it's just their style.
@FabMusacchio

[biggreenjoe@mastodon.social]

@FabMusacchio Also, what's with the chains? And look at the left thumb on front and center guy.

[johan@s.cafe]

@Walrus @nihilarc @FabMusacchio

Well, and besides, in a photograph with shadows, what's important is not that the lines don't converge, but that the shadows are basically at different angles, which means (would mean, in the case of a real photo or a render) that the light source is located very close.

Shadows from an “infinitely” distant sun should be parallel (well, on the scale of a single city square).

[grishka@friends.grishka.me]

oh this is a neat trick, I usually look for distorted writing and other small detail, but latest AI models are getting better at those

[zven@bsd.network]

@FabMusacchio you forgot to poison your data , you post they learn

[stevecrozz@ruby.social]

@FabMusacchio I don't know, I've seen some pretty bad tile jobs