Andriamasinoro Rahajaniaina wrote:
> I already use ARToolkit in my application and I'd like
> to change to ARToolkitPlus. Could Someone  give me an
> idea for building a function for grabbing video with
> ARToolkitPlus ?

A simple approach is to use the OpenCV computer vision toolkit.  It 
includes a very high-level cross-platform means of capturing video:
     http://opencvlibrary.sourceforge.net/HighGui

Once you've used cvCaptureFromCAM, pulling video is as simple as:
     IplImage* img = cvQueryFrame(cvCapture* capture);
     markerId = mTracker->calc((unsigned char*)(img->imageData));

Notes:

1) Highgui's camera capture on Windows uses ancient VFW.  We found it to 
be slow and have since switched to DirectShow.  (Search the opencv yahoo 
group for "DirectShow".)  Still, the above will get you going.

2) You'll likely want to place the cvQueryFrame() call in a thread.  It 
blocks until a new frame is ready, time that is usually needed for your 
program's logic and/or graphics updates.

Cheers,
Darran.

-- 
Darran Edmundson [darran@e ............]
Interactive visualization for museums and industry
http://www.edmstudio.com

Hi everyone,
I already use ARToolkit in my application and I'd like
to change to ARToolkitPlus. Could Someone  give me an
idea for building a function for grabbing video with
ARToolkitPlus ?
What does mean the parameter "nFileName" of
ARFileGrabber in CameraCalib directory ?
Thanks


	

	
		
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hi Andriamasinoro,

the ARFileGrabber class is just a simple replacement to let the
calibration tool run with files instead of a real camera feed. this
comes handy if you want to calibrate cameras from devices on which you
can't run the calibration tool natively (e.g. embedded devices or
phones/PDAs). i believe that ARFileGrabber is not what you are looking
for. actually we recommend calibrating cameras for ARToolKitPlus with
the MatLAB camera calibration toolkit today since it delivers more
accurate results and is a lot faster to do.

ARToolKitPlus does not come with a built-in camera library, since we
believe that basically all advanced AR users already have a working
solution for that or have no problems applying one. (also: HitLabNZ does
an excellent job in maintaining ARToolKit's camera library and we do not
want to duplicate their work.)

actually you are also in the situation i just described: you already
have a camera library running in your application (the one from
ARToolKit) and it should therefore not be easy to use that as a basis
for switching to ARToolKitPlus.

bye,
Daniel

Take a look at our video capture package on sourceforge  
(videowrapper).  It supports directshow, as well as native camera  
api's from pointgrey, canon, and videre design.  It also supports  
macosx.



On Sep 11, 2006, at 8:56 PM, Darran Edmundson wrote:

> Andriamasinoro Rahajaniaina wrote:
>> I already use ARToolkit in my application and I'd like
>> to change to ARToolkitPlus. Could Someone  give me an
>> idea for building a function for grabbing video with
>> ARToolkitPlus ?
>
> A simple approach is to use the OpenCV computer vision toolkit.  It  
> includes a very high-level cross-platform means of capturing video:
>     http://opencvlibrary.sourceforge.net/HighGui
>
> Once you've used cvCaptureFromCAM, pulling video is as simple as:
>     IplImage* img = cvQueryFrame(cvCapture* capture);
>     markerId = mTracker->calc((unsigned char*)(img->imageData));
>
> Notes:
>
> 1) Highgui's camera capture on Windows uses ancient VFW.  We found  
> it to be slow and have since switched to DirectShow.  (Search the  
> opencv yahoo group for "DirectShow".)  Still, the above will get  
> you going.
>
> 2) You'll likely want to place the cvQueryFrame() call in a  
> thread.  It blocks until a new frame is ready, time that is usually  
> needed for your program's logic and/or graphics updates.
>
> Cheers,
> Darran.
>
> -- 
> Darran Edmundson [darran@e ............]
> Interactive visualization for museums and industry
> http://www.edmstudio.com