Interactive Camera-Projector System

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** [http://www.somgnu.org/?p=66 kmando on somgnu.org]
 
** [http://www.somgnu.org/?p=66 kmando on somgnu.org]
 
** [http://linmagazine.co.il/hacking/kmando-camera-projector-system-37794 kmando on linmagazine.co.il]
 
** [http://linmagazine.co.il/hacking/kmando-camera-projector-system-37794 kmando on linmagazine.co.il]
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** [http://www.opennewsshow.org/node/14 kmando on Open News Podcast]
  
 
<!-- Has iSightSee taken of now? [http://mydreamapp.com/forums/viewtopic.php?id=960 Mike Gaboury about his project iSightSee] -->
 
<!-- Has iSightSee taken of now? [http://mydreamapp.com/forums/viewtopic.php?id=960 Mike Gaboury about his project iSightSee] -->

Revision as of 23:40, 6 February 2008

Developed by Juan Roldan, ERASMUS exchange student from Cordoba, Spain
Ushakiran Soutapalli, MSc student at Sheffield Hallam worked on the graphical user-interface
Playing Reversi against the computer (available as Google-Video or 5.54 MByte DivX-video)

Contents

Camera-Projector System

Application

kmando is a human computer interface using a camera and a projector. It was developed by Juan Roldan (prototype), Ushakiran Soutapalli (user interface), Julien Faucher (calibration), Jan Wedekind (technical supervision), and Claudia Amico (artwork) at the Microsystem & Machine Vision Laboratory (MMVL) at Sheffield Hallam University, UK.

The software makes use of a Logitech Quickcam Pro 4000 webcam with a resolution of 640x480. The camera is calibrated against a standard projector screen and then used to determine the position of physical pointer (e.g. a pen) which is then used to virtually move the X11 pointer. Point-and-click functionality has also been implemented. The software now also supports IIDC/DCAM compatible firewire digital cameras (see Damien Douxchamps list for cameras with IIDC=yes/1.30/1.31). Note that Video for Linux version 2 (V4L2) currently is not supported by kmando.

The required parts of the Mimas real-time computer vision toolkit are included in the package.

How it works

Detection

The detection is a simple colour-segmentation using a thresholded colour-histogram. Therefore you need to use a marker pen or some other object with a distinct colour. The colour should not appear on the screen itself. If the colour of the pen will change due to different illumination conditions, you need to capture these colours when taking the reference image.

Mouse clicks

The standard deviation of a few recent mouse-positions is used as a criterion, wether the mouse is stationary or moving. If the mouse is stationary, a mouse click is issued.

Design

UML-diagram of static structure
UML-diagram showing collaboration of classes

Changelog

2007-03-27 Jan Wedekind <ja2008-02-06 Jan Wedekind <jan at wedesoft.de> 1.5

  • Adding support for firewire digital camera
  • image_v4linput.cc: Accepting YUV422 (assuming it is same as UYVY).
  • Wizard has new combo-box for selecting video mode (PAL/NTSC/SECAM/AUTO)
  • image_v4linput.cc: Not preferring RGB support of camera. Prefer UYVY or YUV420p instead.

2007-04-14 Jan Wedekind <jan at wedesoft.de> 1.4

  • Added spin-box for selecting camera channel.
  • GUI now has sliders for adjusting brightness, contrast, and others.

2007-03-27 Jan Wedekind <jan at wedesoft.de> 1.3

  • Added some explanation about capturing reference image.
  • Distorted e-mails because of spam.

2007-02-12 Jan Wedekind 1.2

  • configure.ac: Configure script must not use Qt3-moc.

2007-02-11 Jan Wedekind <jan at wedesoft.de> 1.1

  • Makefile.am: Added moc-, qrc-, and uic-files to clean-rule.
  • configure.ac: Call "make clean" to delete built sources.

2007-02-02 Jan Wedekind <jan at wedesoft.de> 1.0

  • Applications seems to run stable now -> releasing version 1.0

2006-10-20 Jan Wedekind 0.6

  • Minor fixes on configure-script

2006-10-20 Jan Wedekind 0.5

  • Fixed the check for gfortran (using AC_PROG_FC now). Thanks to Steven G. Johnson! 
# On the older Mandriva version you may have to configure using
./configure FLIBS="-lgfortran"

# On openSuSE 10.0 libgfortranbegin.a was compiled without "-fPIC". You need to configure using
./configure F77=gfortran FLIBS="-lgfortran"

2006-10-17 Jan Wedekind 0.4

  • Added support for UYVY-cameras.

2006-10-16 Jan Wedekind 0.3

  • Video display can be zoomed using the mouse-wheel.
  • Display error-messages when accessing camera fails.

2006-10-13 Jan Wedekind 0.2

  • Removed dependency on ImageMagick.

Downloads

Download mando-1.5.tar.bz2 (366 kByte). For your convenience the required parts of Mimas are included in the package. To build and run the package do 

tar xjf mando-1.5.tar.bz2
cd mando-1.5
./configure
make
./mando

Treviño Treviño supplied a Ubuntu package of mando-1.4 for Ubuntu Edgy at http://3v1n0.tuxfamily.org/dists/edgy/3v1n0/

Gallery

Accessing the KDE-menu using the system (2.72 MByte video)
Artist's impression of the system
Interactive camera-projector system
Long demonstration of the prototype-system (11.4 MByte video)
Short interactive slides presentation with the system (6.3 MByte video)
Browsing the file-system and trying to play minigolf (14.4 MByte video)
Calibration of the screen using projected patterns
Prototype of early user-interface (13.7 MByte video)
Screenshot of the wizard for configuring the recognition algorithm
Playing Reversi against the computer (5.54 MByte video)

Future Work

  • Port application to Ruby using HornetsEye and Qt4-Ruby
  • Develop port for MS Windows
  • Add support for firewire cameras (libdc1394, libdc1394 version 2)
  • Support for V4L version 2
  • Test with cheap IR-camera
  • Test with 90 fps camera

You can help by donating some of your spare time and expertise ;)

See Also

External Links

Retrieved from "https://vision.eng.shu.ac.uk/mmvl/mmvlwiki/index.php?title=Interactive_Camera-Projector_System&oldid=2262"
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