16 Oct 2012

Software detects image manipulation - video version on the way

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Tungstene - real or fake" Tungstene - real or fake" Tungstene/RedShark

Tungstène is an application used to detect digital image manipulation. It's a heavy-weight mathematical engine with a GUI front-end. It doesn't only rely on metadata or other tamper-sensitive information in the image, but mainly analyses the image itself. Erik Vlietinck reports.

Used by press agencies, forensic institutes and the military, Tungstène is currently looking for a somewhat broader distribution network, but its French developer and patent owner Roger Cozien, states quite specifically that this is no software for end-users. It requires at least one full week of training before you can work with it. When you can, you can tell with virtually 100% confidence an image has been altered digitally.

Agence Presse, France, uses Tungstène to check whether what is depicted by a photo is was really there when the photographer shot the image, or whether elements have been added or left out.

Tungstène can do more, though.

It will also show areas that have been retouched. If part of a face has been shadow-lifted because of cosmetic reasons, the software will show the affected area in bright colours.

Interpretation

While Tungstène can show whether a photograph has been tampered with, and which areas have been affected, it can't interpret the results. For example, when a shot of three F16s shows one of them lacks the invisible heat footprint that real F16s produce in the vapour trail, the interpretation is easy: that one plane has been digitally added.

When Tungstène shows a shadow area has been altered, the interpretation becomes more of a puzzle: was it changed because of cosmetic reasons, or to emphasise the person's importance by making her stand out more?

The interpretation part and the rather complicated filter technology used in Tungstène makes it software that requires training. Cozien and his firm eXo Makina are already working on a video version. In 2013, Tungstène is set to conquer the US.

Tungstène's power: A photo of Kate Middleton proves to be fake. The software reveals the full head and hair have been "Photoshopped" on someone else's body.

The software also detected an edited square right in the middle of the chest. Cozien used the app's multispectral tools to find these "retouches".


Erik Vlietinck

Based in Holland and Belgium, Erik Vlietinck is the publisher of the IT Enquirer, a pan-European online publication covering multimedia content production.

He also regularly creates online textual and video content for websites of companies across Europe and writes for Photoshop User and occasionally contributes to Post Magazine. Erik has been a freelance writer for over a dozen IT-magazines in Great-Britain, Holland and Belgium.

He has written product reports on editorial systems, superwide format UV-curing inkjets, Postscript RIPs and DAM systems. From 1998 to 2004 Erik wrote the Administrator Guides for DMPartners’ linguistic search engine for publishers and WoodWing Software’s Enterprise 7 cross-media publishing system.

Up to 1990, Erik served as a solicitor at the Antwerp Bar Association and a lecturer at Vlekho, a university located in Brussels, where he bored post-graduate students with IT contracts law.

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