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What is the smallest size of ImageTarget I can have

July 2, 2015 - 8:08pm #3

I want to create very small Image targets, I wonder if anyone knows the smallest physical marker dimensions that I can track using Vuforia?

What is the smallest size of ImageTarget I can have

July 6, 2015 - 9:52pm #2

What is the smallest size of ImageTarget I can have

July 20, 2015 - 9:50pm #1

I have the same requirements to use very small targets, in the order of 10mm x 10mm for Frame Markers or otherwise 10mm x Wmm for cylindrical targets with a rectangular width of the label equal to W.

I've tried finding and reading all the information I could about Vuforia's suggested approach to trackables.

I understand the ~10 rule of thumb. So, if I use my 10mm x 10mm example, I will have an operating distance of approx 10cm to the camera. I need about 30-40cm.

I also read that with Image Targets, the minimum pixel height of the image should be 320pix. How does that relate to a printed object, as it depends on how many DPI I print that image out with. For example, my 10mm height target needs to be 236pix for be printed at 600DPI. I've tried some examples with this size and it does work, but does not track consistently. How does the 320pix apply?

So, I'd like to know what is my best approach to achieve trackables at this size?

Using Image Targets with good textures, will give me more feature points per small area. But getting a good texture at that scale might be difficult.

On the other hand, using Frame Markers might be better as they are potentially easier printed (coarser features) but will have less features to help with consistent tracking.

More 'coarse' markers like binary 2D barcodes as used in ARToolKit might be easier printed at this scale, but also lacks in features-per-square-mm.

And lastly, the resolution of the camera obviosuly plays a roll as well. Clarifying relationships would be great.

What is the best approach in all of this? 

Thanks for the help!

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