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multiple camera self calibration Toolbox
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README.rst

Multi Camera Self Calibration toolbox

The is an updated version of the Multi Camera Self Calibration toolbox by Svoboda et al.

Links:

  • This version of the code lives on github.
  • The original website remains a good source of information. (This version of the code is being made publicly available with the permission of Tomas Svoboda.)
  • We have an online discussion group.

If you use this library, please cite:

Svoboda T, Martinec D, Pajdla T. (2005) A convenient multi-camera self-calibration for virtual environments. PRESENCE: Teleoperators and Virtual Environments. 14(4):407-422. [link]

Changes from the original version

At a high level, the changes are all in the usage, and not in the algorithmic domain. Those I remember are:

  • Various small changes to get to work using Octave
  • Disable plotting when running using Octave
  • Implementation of new configuration file format that lives alongside the calibration data rather than in the source code files
  • Inclusion of some sample data and tests
  • Inclusion of a python interface to run the MultiCamSelfCal application
  • Improved the interface for maximally aligning a new calibration to existing camera centers. See Align-Existing config option, and the original_cam_centers.dat input file.

The version history should make all of the changes clear.

The original readme file is in MultiCamSelfCal/README.txt

Quick test

To test if everything is working for you, do the following:

cd MultiCamSelfCal
octave gocal.m --config=../strawlab/test-data/DATA20100906_134124/no-global-iterations.cfg

This will run most of the algorithm on some sample data. Your computer should churn for a few minutes and finally should end with some lines indicating a successful calibration (with mean reprojection error 0.62 pixels):

GNU Octave, version 3.2.3
Copyright (C) 2009 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Octave was configured for "x86_64-pc-linux-gnu".

Additional information about Octave is available at http://www.octave.org.

Please contribute if you find this software useful.
For more information, visit http://www.octave.org/help-wanted.html

Report bugs to <bug@octave.org> (but first, please read
http://www.octave.org/bugs.html to learn how to write a helpful report).

For information about changes from previous versions, type `news'.

arg = --config=../strawlab/test-data/DATA20100906_134124/no-global-iterations.cfg
config_dir = /home/astraw/astraw-git-root/flydra/MultiCamSelfCal/MultiCamSelfCal/../strawlab/test-data/DATA20100906_134124/
Multi-Camera Self-Calibration, Tomas Svoboda et al., 07/2003
************************************************************
Experiment name: strawlab_test
warning: The calibration file config.files.CalPmat does not exist
warning: No P mat available
warning: The calibration file config.files.CalPmat does not exist
warning: No P mat available
warning: The calibration file config.files.CalPmat does not exist
warning: No P mat available
warning: The calibration file config.files.CalPmat does not exist
warning: No P mat available
warning: No Pmat available

********** After 0 iteration *******************************************
RANSAC validation step running with tolerance threshold: 10.00 ...
RANSAC: 2 samples, 523 inliers out of 523 points
RANSAC: 1 samples, 523 inliers out of 523 points
RANSAC: 2 samples, 432 inliers out of 434 points
RANSAC: 1 samples, 362 inliers out of 362 points
522 points/frames have survived validations so far
Filling of missing points is running ...
Repr. error in proj. space (no fact./fact.) is ...  0.708677 0.688062
************************************************************
Number of detected outliers:   0
About cameras (Id, 2D reprojection error, #inliers):
CamId    std       mean  #inliers
  1      0.62      0.69    432
  2      0.81      0.70    523
  3      0.83      0.78    523
  4      0.49      0.53    362
***************************************************************
**************************************************************
Refinement by using Bundle Adjustment
Repr. error in proj. space (no fact./fact./BA) is ...  0.714557 0.686345 0.620358
2D reprojection error
All points: mean  0.62 pixels, std is 0.61

Python wrapper

John Stowers wrote an API to let this code be directly called from Python. To install:

cd python python setup.py install

To test:

cd python/tests nosetests
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