Building 3D Models from photographs

1
Building 3D Models from photographs
Paper PhotoBuilder -- 3D Models of
Architectural Scenes from Uncalibrated Images,
Roberto Cipolla, et al. IEEE International
Conference on Multimedia Computing and Systems,
1999., Volume 1 , 1999 Page(s) 25 -31
Presentation By Jason Yindong Zhu Nov. 21, 2000
2
Overview

• Three Approaches
• Geometry-based, image-based and hybrid-based
• Geometric Background
• Approaches and finding vanishing points
• Outline of a simple algorithm
• Demonstration of PhotoBuilder Software
• Facade (Canoma)
• Conclusion

3
Three approaches
See reference 8 in my bibliography web-site
4
Geometric Background (1)

• Projection Matrix

• P K R T

5
Geometric Background (2)

• Finding vanishing point

6
Outline of a simple algorithm (1)

• Based on constraints
• Input to the algorithm (1) two images

7
Outline of a simple algorithm (2)

• Input to the algorithm (2) User select
  edges and Connors

8
Outline of a simple algorithm (3)

• Camera calibration Determine the
  internal camera parameters

9
Outline of a simple algorithm (4)

• Camera Position and Orientation
  Determine the position and orientation of camera

10
Outline of a simple algorithm (5)

• Computing projection matrix and Reconstruction

11
Outline of a simple algorithm (6)

• Compute 3D textured triangles

12
Demonstration of PhotoBuilder
CD Box
House
13
Facade (1)

• A more complicated but precise method of
  modeling and rendering architecture
  photorealistically from a small number of
  photographs. (Canoma)
• Photogrammetric Modeling
• View-Dependent Texture Mapping
• Model-Based Stereo

14
Facade (2)
SFMOMA (San Francisco Museum of Modern Art) by
Yizhou Yu, Reference 9 in my bibliography web
site
15
Conclusion

• PhotoBuilder is a simple and fast way to build
  3D architectural models
• Improvements could be made to build 3D models
  from more complicated object
• Wide application

16
Disscussion
1) The possible application of building 3D model
from uncalibrated images. 2) Is there anything
that could be improved in this software or
algorithm? 3) Is there any other software that
can build 3D model from photographs?