We know it’s shopped, but we can’t tell because of the pixels. PhD student [Kevin Karsch] along with a few other friends will be presenting their methods to render objects into preexisting photos at SIGGRAPH Asia next month.

The paper (PDF…) covers how [Kevin] et al. go about putting impossible objects into photos. The user first defines the geometry of the picture; legs of tables are defined and the table top is extruded from these legs. The lights are then defined by drawing a bounding box and with a little bit of algorithmic trickery, a 3D object is inserted into the scene.

Comparing the results to the original picture is jaw-dropping. For us, photoshopping a bunch of billiard balls on a pool table would take hours, and it would never look quite right. [Kevin]‘s work for SIGGRAPH can do the whole scene in minutes and produces results we couldn’t dream of.

There’s no downloadable software yet, but the algorithms are there. Check out the video demo of the techniques and results after the break.

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Among the courses at this year’s SIGGRAPH (an annual technical conference and showcase of the latest in computer graphics research) was an introduction to 3D scanning that covers all the bases: mathematical foundations, two different build-your-own hardware approaches, and how to process and render the resulting datasets. The presenters have assembled all the course materials on a top-notch web site featuring slide shows, complete source code, and an extensive round-up with links to both commercial and homebrew 3D scanning gear. The simplest of these methods requires nothing more than a webcam, halogen light source, and a stick!

SIGGRAPH and 3D scanning have been highlighted many times on Hack a Day, but we’re swelling with pride now seeing an academic venue give a favorable nod to the DIY hacking community (on their links page). Okay, so Hack a Day isn’t called out by name, but just wait’ll next year!

[Thanks Fahrzin]

Long before we started reporting on [Dan Kaminsky]‘s DNS chicanery, he contributed a guest post about one of our favorite sources of new technology: SIGGRAPH. The stars have aligned again and we’re happy to bring you his analysis of this year’s convention. [photo: Phong Nguyen]

So, last week, I had the pleasure of being stabbed, scanned, physically simulated, and synthetically defocused. Clearly, I must have been at SIGGRAPH 2008, the world’s biggest computer graphics conference. While it usually conflicts with Black Hat, this year I actually got to stop by, though a bit of a cold kept me from enjoying as much of it as I’d have liked. Still, I did get to walk the exhibition floor, and the papers (and videos) are all online, so I do get to write this (blissfully DNS and security unrelated) report.

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While attending LA SIGGRAPH Maker Night, we got to talk to [Brett Doar] about his Bronco Table. The table is meant to make life more difficult by bucking off anything that’s set on top of it. Right now, it uses a tiny piezo mic to listen for the impact and then drives three leg motors in a random pattern. He envisions later generations either running away or following you intently when something is set on them.

The main problem with the current design is that you have to hit the table hard enough to make a noise the mic can pick up. The ideal solution would be able to detect anything, no matter what the material or how forcefully it was set down. How would you detect objects being placed on the surface (table doesn’t have to be wood)?

We coaxed our friends at Mahalo Daily into coming along with us to LA SIGGRAPH’s Maker Night. There were a handful of interesting projects there. [Univac] was showing a circuit bent Teletubby and his CellularRecombomat. [Brett Doar] brought his Bronco Table. Tired of engineers building items that made life easier, he decided to make something that made life more difficult. The table uses a piezo to detect the sound of something being set on top. It then starts twitching and bucking to shake the item free. The motors look like they’re salvaged window motors. Finally, we talked to [Mark Frauenfelder] from BoingBoing/Make about how he got into the DIY culture.

We’re headed to Cleveland at the end of the week (we’ve heard rumors it rocks) and thought it would be good to list the events we’re planning on hitting in the next five months.

• Notacon / Blockparty April 4-6 Cleveland, OH – This will be a first for us, but we’re definitely excited, especially for the demoscene madness at Blockparty (like Trixter’s MONOTONE PC speaker tracker).
• ToorCon Seattle April 18-20 Seattle, WA – In its second year, this small gathering is sure to be a blast just like last year.
• The Last HOPE July 18-20 New York, NY – Our first HOPE and the last one ever.. since the hotel is being torn down.
• Black Hat US August 2-7 Las Vegas, NV – If anything gets released this year, it’ll be here.
• DefCon August 8-10 Las Vegas, NV – The first con we ever went to. It’s not the best con, but it’s always interesting.
• SIGGRAPH August 11-15 Los Angeles, CA – SIGGRAPH is where you need to be if you want to see cutting edge graphics and interaction projects. It’s a favorite of ours and a nice break from computer security.

Anything we’re missing?

UPDATE: Maker Faire May 3-4 San Mateo, CA – Can’t believe we forgot it. Thanks [pt]!