3D Models from Photos
Tobias Günther @elaspix
The Issue
● Create a textured 3d model based on a photo
● Without calibrating the camera or anything else
The “manual” working process
● Get photos without perspective distortion
● Step 1: Modeling
● Step 2: Texture Projection
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
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
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
Insight-3D
Requires multiple images
With 2°-6° rotation diff.
The user marks key edges and facesIdentified unique pattern in all images
Texture projection and modeling
● The user models manually
● Modelling and texture projection is supported by
software
Ease of
use
Automatic pattern
matching among photos
robust Number of
images
required
Method
Sketchup ++ no +++ 1 Perspective
Geometry
Insight3D - yes - 3-4 Stereopsis
Free Software to create 3D from 2D
● Supports texture
projection and modeling
● Output: fully usable 3d-
model
● Contextual folding and
inflation
● Output: a folded Sheet
of “Paper”
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
Automatic Photo Pop-up
http://www.youtube.com/watch?v=PulpuyVx3lk
Make-3D
http://make3d.stanford.edu/images/showall
Contextual Folding
Photo-Sculpt Photo-to-3D.com
Free Software for Contextual Folding
Ease of
use
Automatic pattern
matching among
photos
robust Number of
images
required
Method
Photo-Sculpt ++++ yes - 2
(front+right)
undisclosed
Photo-to-3d + yes - many Stereopsis
Make-3D ++ Not required ? 1 Image
understanding
Automatic
Photo Pop-Up
++ Not required ? 1 Planar Plane
understanding
● Created fully automatically without calibration
● Output: planar surfaces or inflated areas
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
scene using artificial landmarks3dsom.com
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