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Tracking non-cubic shape?

June 2, 2011 - 7:57pm #1

Hi,

Is it possible for QCAR to track a non-cubic shape? E.g I take multiple images of my phone, jigsaw them into a shape similar to the real phone, can QCAR track that model?

Re: Tracking non-cubic shape?

June 6, 2011 - 9:28am #6

QCAR can detect up to 50 ImageTargets in one application. QCAR can track up to 5 targets simultaneously. Of course tracking requires each target to be in the field of view of the camera which can be difficult with 5 ImageTargets.

If you need to detect more targets at once, I would suggest looking at FrameMarkers. All 512 FrameMarkers can be used in one application.

-Peter

Re: Tracking non-cubic shape?

June 3, 2011 - 9:11pm #5

So, do anyone know that how many ImageTarget that QCAR can track ? I means the maximum number of ImageTarget in one QCAR app

Re: Tracking non-cubic shape?

June 3, 2011 - 8:10am #4

Ah right.
I was unaware of this.
Good call.

Re: Tracking non-cubic shape?

June 3, 2011 - 6:25am #3

Well, you can create multi targets that are non-cubic, although they still must be made up of image target planes. You need to upload all of your target planes as image targets in the TMS, and then you can manually edit the config.xml file to create a custom multi target. Take a look at the Dev Guide > Trackables > Multi Targets section.

If you're using our Unity extension you can visualize the target in the Unity editor as you build it, which is handy!

I do warn you that tracking arbitrary 3D objects (like phones, with raised buttons, etc.) with 2D image representations doesn't necessarily work well. Also, each plane that you use in your multi target needs to be feature-rich for it to track.

- Kim

Re: Tracking non-cubic shape?

June 3, 2011 - 1:44am #2

It would be tracking each planar surface individually.

But I suppose you could define an object and transform the co-ordinates for each target so the object stays in the same spacial position relative to the camera.

So if 2 targets are side by side and you want an object to appear between them you'd define the co-ordinates of the object to be off to the left for the right hand target and off to the right for the left hand target.

target 1................target 2
|...............|....|...............|
|...............|....|...............|
|............[object].............|
|............[object].............|
|...............|....|...............|
|...............|....|...............|

If that picture makes sense.

You might find however that the object may flicker when transferring from one surface to the next.

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