Problems with new Cube-Trackers

March 3, 2015 - 8:04am #1

Hi 

since my problem seems to be connected to the new website, which correlated with the 4.0 release I´m writing it in this categorie:

Apparantly Vuforia changed some things with the cube-trackers, since old cube-trackers dissappeared (or broke down into the single image targets),when the webside was changed.
I just uploaded my cube-tracker anew and have a very specific problem: 

When I import this tracker-package into an old package (3.0.9) the tracking is quite bad. When I import the tracker into a new projekt (4.0.103) the first recognition is much better.

Unfortunately here comes a very strange behaviour: only some sides of the cube get recognized good, the other ones are quite bad (but they stick, when one side was recognized and the tracking doesn´t break, when we rotate the cube). Interestingly the affected sides change with every start of the app! Only secured thing is that the FIRST tracker shown to the cam is recognized good(always) - independend which one it is.

We testet it for about 2 days now in all possible variations but always get to the same behaviour.

The problem doesn´t lie with the images, since they are recognized as single ImageTargets just fine. (and as mentioned: every image is tracked just fine, if it was the first shown to the cam)

@ Vuforia: please help with this issue.

 

Best regards

Maik Krücken

Problems with new Cube-Trackers

March 16, 2015 - 4:52am #9

I've tried with your images (by creating a MT target with size 90 x 90 x 90), but I was not able to reproduce the issue;

in fact, I was able to correctly detect all faces, by rotating the cuboid so that only one face at a time is visible;

the detection occurred on all faces within a same run, regardless of what was the first face to be detected (i.e. they all seemed to detect equally well);

however, I did notice that the features in most faces (except for the "back" face) are primarily concentrated around a very small area of the image, primarily along the "scale" (or "ruler") pattern which crosses each image from left to right;  

along that pattern, the features are very close to each other and depending on the distance from the camera, they may be hard to spot d as the webcam resolution is typically not so high and can make things appear a bit  "blurry" (this may also vary from a webcam model to another). In general the faces you use in your target seem to need a very well-lit environment when using Play Mode, and the target need to be kep quite close to the Camera (otherwise the features tend to disappear at the resolution and contrast levels of the webcam).

Also, you mentioned this only happens in Play Mode;  so, I assume on Android and/or iOS devices you tested things work pretty OK ?

 

 

Problems with new Cube-Trackers

March 16, 2015 - 3:58am #8

Got them, thanks, I will investigate..

Problems with new Cube-Trackers

March 12, 2015 - 7:20am #7

I have asked for the Target Size (as well as the images used to create the MT)  simply because I would like to reproduce the issue on a small repro project and debug it, and I'd like to be sure that I have the same assets as you.

Would that be possible for you to provide the images and the target sizes ? (maybe via PM ?)

 

Problems with new Cube-Trackers

March 12, 2015 - 7:15am #6

The problem is apparantly restricted to the Unity Play-Mode.

About the Target Dimensions: We tried a couple of different ones, with no difference. But this tpoic seems quite fuzzy either way: It is always said, that the dimension for the tracker-creation are only needed for the correct scaling in 3D Space. But since you ask directly for it and I´ve seen some other post, that implicate, that the dimensions are indeeed important for the tracking, too : could you say something about in wihch way the dimensions can effect the tracking quality?

Problems with new Cube-Trackers

March 12, 2015 - 7:10am #5

?

Problems with new Cube-Trackers

March 4, 2015 - 6:12am #4

And could you specify if the problem occurs in Play Mode or on a specific device ? 

Problems with new Cube-Trackers

March 4, 2015 - 6:11am #3

Hi,

could you post or send me the images (in JPEG or PNG) you use for the side faces of your cuboid ?

and also, the target size (width, height, length) you are using ?

 

Problems with new Cube-Trackers

March 4, 2015 - 12:40am #2

I´d very much like to send a moderator a screencapture I made, that shows the behaviour, that the first tracker shown to the camera always gets much better tracking but unfortunately it seems, that the forum has a little bug that came with the new website. I can´t seem to get a "detail-page" for any user. Therefor I can´t send any private messages. 

Are you guys experiencing the same?!

 

*edit:

When I click an any name besides myself I only get an empty Vuforia page. Try this one:

https://developer.vuforia.com/users/alessandrob

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