[sldev] Anyone here with OpenCV experience?

[Tigro Spottystripes]

What about Freetrack ? http://www.free-track.net/english/

or you're going for more than just 6dof positioning, or positioning
without anything but a webcam?

Philip Rosedale escreveu:
> Have you seen this video...  http://www.youtube.com/watch?v=r7Gn2TyEyHw
>
> It is a cheap logitech camera tracking a head and head rotation really
well (which you can see by the registration quality of the video overlay).
>
> This is what we want - simple head position and movement tracking from
a camera.  I suppose we could just use the logitech API but that would
restrict us to their cameras.  I believe that the code they ship with
their cameras is based on OpenCV?  Hence the question.
>
> Philip
>
> Jan Ciger wrote:
> Philip Rosedale wrote:
>  
> >>> Has anyone here worked with camera-based gesture recognition before?  
> >>> How about OpenCV?  Is OpenCV the best package for extracting basic
> head
> >>> position/gesture information from a camera image stream?  Merov and I
> >>> are pondering a Snowglobe project to detect head motion from simple
> >>> cameras and connect it to the SL Viewer.
> >>>     
>
> I have done something like that. First of all, OpenCV is does not do any
> gesture recognition. It is an image processing library and you need to
> know quite a bit about computer vision to be able to use it
> meaningfully. I have found this book indispensable for that:
> http://oreilly.com/catalog/9780596516130/ , plus a good basic computer
> vision textbook.
>
> If you want to track the orientation of the head with a webcam, that is
> doable - NaturalPoint is selling infrared webcams that track either a
> single point or a simple rig on your head and translate that to mouse
> motion. That is easy enough to do. If that is all you want to do
> (translate head motion to 2DOF mouse-like signal), OpenCV is even an
> overkill - capture image, threshold it to extract the marker and measure
> where it is compared to the initial position. Then use that difference
> to steer camera.
>
> The main issue you will have will be a cross-platform video capture
> library. I have yet to find one that is not too buggy and actually works
> without doing crazy stuff. OpenCV has some code for capturing video, but
> that is mainly for debugging and shouldn't be used for production (it is
> *really* buggy and slow).
>
> On the other hand, if you want to do something more complex - e.g. full
> 6DOF tracking, OpenCV is a good starting point. For example, I have the
> Minoru 3D webcam (http://www.minoru3d.com/) connected to a 3D tracker on
> Linux that allows me to track both the position and orientation in space
> - like a 3D mouse. The tracker is made using OpenCV. However,
> calibrating that is not something for an average Joe to do ...
>
> Regards,
>
> Jan
>
>

> -------------------------

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