i have this old artk+ discussion in my browser. dated back from Jun03:
sonderformat: [03.06.07 03:31 ](03.06.07 03:31 )
you wrote, that you copied the ArToolKitPlus.dll of the artk+ distribution into the vvvv bin. this is totally the wrong way.
you don’t really need the “ARToolkitPlus library”.
only to get markers and a camera calib file.
just download the ARTK+Tracker.zip.
unzip the ARTK+Tracker.dll and the helpfile into the vvvv “freeframe” folder and start the helppatch.
if it is not working, what exactly is not working?
do you get a camera image?
foxonfire: [04.06.07 11:14 ](04.06.07 11:14 )
i have finally get it working after the weekend !!!
thanks for your detailed steps which made me looking into everything again, it was my fault copying a bad camera calibration file to the Freeframe folder… so many .dat product when i was playing around with ARTK+ previously :P
now i can see a good list of tag numbers when the markers show up. Nice!!!
absolutely no need to copy the ARTookKitPlus.dll to the path. (it was one of the desperate moves i tried when there was no clue at all…)
camera calib file is essential: use the one supplied with the ARTK+ package is a good start (LogitechPro4000.dat). it should work with most webcams (i tried)
if you suspect the webcam is not working, you can replace the ‘videoin’ with a ‘filetexture’->‘asVideo’ and load a test image from the ARTK+ (e.g. image_320_240_8_marker_id_bch_nr0100.jpg)
hope this is useful in case someone run into problem.
dujoducom: [05.06.07 04:59 ](05.06.07 04:59 )
I can’t get this to work, where do you get the .pat files for use with the “marker” node? I’ve found the patterns to print, they are saved as .png in the id-markers/simple/ folder, but I can’t find the .pat files (I just searched for *.pat). Am I missing something?
tonfilm: [05.06.07 05:07 ](05.06.07 05:07 )
don’t you mean .dat?
dujoducom: [05.06.07 05:13 ](05.06.07 05:13 )
no, the camera file I can find without a problem. It’s the .pat files that are apparently supposed to be loaded into the pin labeled “Marker Files” that I can’t find.
joreg: [05.06.07 06:53 ](05.06.07 06:53 )
you don’t need a .pat file. they are only needed for custom patterns but that functionality is not implemented yet. all the markers you found for printing are detected automatically.
foxonfire: [05.06.07 10:12 ](05.06.07 10:12 )
a quick question on ‘marker width’: i used to set the ‘border width’ in ARTK+ (for bch-thin it is 0.125). is that correct if i put 0.75 for ‘marker width’ in this case?
joreg: [05.06.07 16:01 ](05.06.07 16:01 )
thanks, good question. forgot to mention that:
the value is to be given in millimeters/100. the default is 80mm/100 = 0.8. it means the actual physical width of your markers.
elektromeier: [06.06.07 16:13 ](06.06.07 16:13 )
i have some troubles with the stability of the tracker…
i observed two problems:
* the markers get lost completly often for one frame (echanged with a -1 id) * the id stays correctly but the transform values change very rapidly to very high values, so high i cant filter them with damper anymore
i tested with a bw cctv camera with variable zoom and iris. how can i improve the stabilty? could that instability be caused of the wrong cameracalibration file (LogitechPro4000.dat)? what cameraparams are defined in that file?
kalle: [06.06.07 21:30 ](06.06.07 21:30 )
if you are wondering about strange transformations of the teapot:
disconnect translate and rotate from the renderer (or reset them…)
sonderformat: [06.06.07 21:45 ](06.06.07 21:45 )
the instability you describe is a big problem which
i have not solved till now.
i’m nearly shure that it is not the camera calib file.
Daniel Wagner from artk+ told me that the tracking must be filtered
by “Kalman” or “Desp” Filter to get more stable.
Kalman should be better but comparing to the effort of implementing DESP, the DESP should be the choice
don’t know if this could be done in VVVV.
should better be implemented in the Freeframe-Code i think but haven’t understood howto till now.
kalle: [06.06.07 23:38 ](06.06.07 23:38 )
projection output of the tracker seems to be constant.
for what reason is the S+H (Animation) in the helpfile?
sonderformat: [07.06.07 00:31 ](07.06.07 00:31 )
i think you’re right with the S+H-Node.
kalle, do you mean the strange transformations you get by using a damper? how and when do you reset the transforms to be aware of this?
oschatz: [07.06.07 00:37 ](07.06.07 00:37 )
@sonderformat: should better be implemented in the Freeframe-Code i think but haven’t understood howto till now.
no - better have it in one vvvv module, so it can be used with all different kind of trackers…
kalle: [07.06.07 04:55 ](07.06.07 04:55 )
with “strange transformations” i mean that the helpfiles “teapot” has an offset translation and rotation relative to the “marker”-quad.
this is due to the settings of translate and rotate node which are connected to the renderers projection transform inlet.
seems that the helpfile was packed in hurry…
today i read on skype that a least two other users tried to retransform that stuff on the teapot and spended some time on this…
another thing 'bout the marker size:
my markers are about 80mm²
and i am SURE that i had it running pretty well this afternoon (at work) with the recommended setting 80/100 = 0.8.
and now (at home) i have to set it to 0.0110 !!!
and same result with girlfriend’s daughter’s webcam.
sonderformat: [07.06.07 21:11 ](07.06.07 21:11 )
sorry kalle. don’t know why you have had to down to 0.0110 marker width.
80mm² are quasi 9*9mm says tuniel.
this physical marker width/100 is working pretty good for us.
also with totally different cams.
i thought you always have to change the transformations
depending by the size of the model you display on the marker.
and it has also to be pitched by 0.25
when i think about it at the moment why not doing this dynamically?
i tried to damp the tracking. but i always get this strange behaviour
(see gaultier screenshot).
i’m wearing this shirt to put artoolkit tracking to the acid test. harhar!
see this. i tried to damp with dynamic filtertime.
i think this is not the ultimate truth in this case.
attachment artk+damper.zip (3.91 Kb)
Desaxismundi: [08.06.07 18:58 ](08.06.07 18:58 )
Here, u can find the Help patch revisited (tx 2 Elektromeier)…it works for me…Hope it helps!!
attachment ARTK+Tracker.zip (513.98 Kb)