Toy Structure From Motion Library using OpenCV

Compile

To compile use CMake: http://www.cmake.org

Prerequisite

• OpenCV: http://www.opencv.org
• Eigen3: http://eigen.tuxfamily.org/index.php?title=Main_Page
• OPTIONAL: SSBA & Sparsesuite: http://www.inf.ethz.ch/personal/chzach/opensource.html (bundeled with the library in the '3rdparty' directory) (Now optional when using the USE_SSBA=OFF option)
• OPTIONAL: Qt 4.8.x (for 3D visualization and GUI) and libQGLViewer: http://www.libqglviewer.com/

How to make

• Optionally build SSBA-3.0, by compiling it from '3rdparty' directory, or use "-DUSE_SSBA=OFF" with cmake.
• If SSBA will not be used, the internal OpenCV bundle adjuster will be used, but I’ve had better luck with SSBA (I may be using the OpenCV bundle adjuster wrong, though).

On MacOS

mkdir build
cd build
cmake -DSSBA_LIBRARY_DIR=../../SSBA-3.0/build -G "Xcode" ..
open SfMToyExample.xcodeproj

On Linux

mkdir build
cd build
cmake -SSBA_LIBRARY_DIR=../../SSBA-3.0/build -G "Unix Makefiles" ..
make 

On Windows

Use Cmake's GUI to create a MSVC solution, and build it.

Use

See http://www.morethantechnical.com/2012/02/07/structure-from-motion-and-3d-reconstruction-on-the-easy-in-opencv-2-3-w-code/

Execute

USAGE: SfMToyUI.exe <path_to_images> [use rich features (RICH/OF) = RICH] [use GPU (GPU/CPU) = GPU] [down/upscale factor = 1.0]

Datasets

Here's a place with some standard datasets for SfM: http://cvlab.epfl.ch/~strecha/multiview/denseMVS.html Also, you can use the "Crazy Horse" (A national memorial site in South Dakota) dataset, that I pictured myself, included in the repo.

References

1. Multiple View Geometry in Computer Vision, Hartley, R. I. and Zisserman, A., 2004, Cambridge University Press [http://www.robots.ox.ac.uk/~vgg/hzbook/]
2. Modeling the World from Internet Photo Collections, N. Snavely, S. M. Seitz, R. Szeliski, IJCV 2007 [http://phototour.cs.washington.edu/ModelingTheWorld_ijcv07.pdf]
3. Triangulation, R.I. Hartley, P. Strum, 1997, Computer vision and image understanding
4. Recovering baseline and orientation from essential matrix, B.K.P. Horn, 1990, J. Optical Society of America [http://people.csail.mit.edu/bkph/articles/Essential_Old.pdf]

Troubleshooting

• If you get linker errors "mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '0' doesn't match value '2' in Visualization.obj", you must make sure you are compiling vs. the right VTK static libs (Debug have "-gd" postfix, Release don't).