Ein Traum für jeden 3D-Modeller: Einfach ein beliebiges Foto nehmen und das 3D-Modell der abgebildeten Objekte automatisch erzeugen lassen. Ich habe mich umgeschaut, welche kostenlos nutzbare Software vorhanden ist und welche Ausgabequalität man erwarten kann. Das Ergebnis habe ich auf dem Photocamp 2010 vorgestellt, Live-Mitschnitt und Blogeintrag gibts auf www.elaspix.de

1. 3D Models from Photos
Tobias Günther @elaspix

2. The Issue
● Create a textured 3d model based on a photo
● Without calibrating the camera or anything else

3. The “manual” working process
● Get photos without perspective distortion
● Step 1: Modeling
● Step 2: Texture Projection

4. Without orthogonal textures
● The modeler's live is much more complicated
● You need to measure
– The width, height and depth of
the object
● You need to know/guess
– camera angle
– camera position
– camera direction
● Required for projection: Match of photo and 3D-Cam

5. Live is easier with smart software
● Sketchup7 is made for handling perspectives
● What you have to do
– Match the green and
red axis with parallel
edges in your photo

6. Sketchup Step 2
● After the camera is in place
● Build the model
● The difference to my
earlier setup:
– The model is built only
AFTER the cam was
placed correctly

7. Insight-3D
Requires multiple images
With 2°-6° rotation diff.
Identified unique pattern in all images The user marks key edges and faces

8. Texture projection and modeling
● The user models manually
● Modelling and texture projection is supported by
software
Ease of Automatic pattern robust Number of Method
use matching among photos images
required
Sketchup ++ no +++ 1 Perspective
Geometry
Insight3D - yes - 3-4 Stereopsis

9. Free Software to create 3D from 2D
● Supports texture ● Contextual folding and
projection and modeling inflation
● Output: fully usable 3d- ● Output: a folded Sheet
model of “Paper”

10. Contextual folding
● calculates the depth map based on image features
● Folds the image at prominent ground lines
D. Hoim, A.A. Efros, M. Hebert, Automatic Photo Pop-up, 2005

11. Automatic Photo Pop-up
http://www.youtube.com/watch?v=PulpuyVx3lk

12. Make-3D
http://make3d.stanford.edu/images/showall

13. Contextual Folding
Photo-Sculpt Photo-to-3D.com

14. Free Software for Contextual Folding
● Created fully automatically without calibration
● Output: planar surfaces or inflated areas
Ease of Automatic pattern robust Number of Method
use matching among images
photos required
Photo-Sculpt ++++ yes - 2 undisclosed
(front+right)
Photo-to-3d + yes - many Stereopsis
Make-3D ++ Not required ? 1 Image
understanding
Automatic ++ Not required ? 1 Planar Plane
Photo Pop-Up understanding

15. Conclusion
● (All) automatic software creates “pseudo-3D”
models by folding and inflation
● High quality can be achieved with
semi-automatic software only
● SketchUp
● The modeling of complex models
requires calibration of camera and 3dsom.com
scene using artificial landmarks