3D Modeling from A Single Photo

Comments

• Mike Green Posts: 23,101

  2013-09-17 09:03 edited 2013-09-17 09:03

  I'm sure it's real. There's a human providing hints to the modeling system. Next time you hear about someone being accused of some impropriety based on a photograph, remember how easy it is to fabricate any sort of an image these days.
• LoopyByteloose Posts: 12,537

  2013-09-17 09:14 edited 2013-09-17 09:14

  It is pretty obvious that there are some assumptions about symmetry and perspective in play.
  
  Since the software has no clue of what the backside looks like, it is limited to replicating the front side in reverse.
  
  And it appears that items in perspective are symetrical from center out.
  
  I suspect that lighting is critical as well and some assumption about the actual depth that shadows create has to be made.
• erco Posts: 20,261

  2013-09-17 09:38 edited 2013-09-17 09:38

  This software might blow a gasket trying to model from a photo of your Klein bottle, eh Loopy?
  
  http://forums.parallax.com/showthread.php/150174-Serving-beverages-from-your-Klein-bottle
• Dave Hein Posts: 6,347

  2013-09-17 10:00 edited 2013-09-17 10:00

  The 3D modeling software seems to be making assumptions about the shape of the objects based on the edge lines. Or maybe the user is manually indicating whether the object is cylindrical or square. Once the outline and shape are defined the software uses the picture for the skin of the 3D model. Notice how the skin of the telescope moves when it's rotated. The original reflections just rotate around with the skin.
• xanadu Posts: 3,347

  2013-09-17 10:39 edited 2013-09-17 10:39

  The part that makes me wonder is the patchmatch algorithm. It seems too good, if it is that good that is amazing. If the telescope part of the video were one picture then the background would have to be auto generated. The hill, flowers and sky behind the telescope have too much random detail to be auto generated. That means they used two pics and layers.
• ElectricAye Posts: 4,561

  2013-09-17 12:28 edited 2013-09-17 12:28

  Mike Green wrote: »

  ... Next time you hear about someone being accused of some impropriety based on a photograph, remember how easy it is to fabricate any sort of an image these days.

  
  Ain't that the truth. The internet is peppered with photos of me and tipsy supermodels in uncompromising positions, but I swear they're all fakes.
  
  As for the software, it looks amazing. Should save the product forgery business a ton of time.
• Duane Degn Posts: 10,588

  2013-09-17 13:16 edited 2013-09-17 13:16

  The failures near the end of the video provide a lot of clues to how it works.
  
  I agree about the patchwork algorithm looking almost too good to be true. I'm inclined to think it's all legitimately amazing.