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How to get a higher target rating

April 1, 2012 - 9:16am #1

Hi there :)

I'm new to the vuforia sdk and I'm currently working together with 3 students on a research project.
We currently try to detect a specific belt buckle with a unique pattern and place a 3D model of the buckle over it in different colors...

Unfortunately we ran into big trouble when trying to convert the design sketches or original photos. The rating is (I think) below 0 stars, maybe -1 :rolleyes:

So what could we do to create a better result here.
I attached 2 variants, the one with the noisy structure has a rating of 2 stars.
This would work although only sub-optimal.

Thanks for any help
Alex

How to get a higher target rating

April 26, 2017 - 10:51pm #6

Hi 

i am new  to Vuforia. I am trying to capture images with my phone camera and uploading these images to cloud database.

On uploading i am always getting 1 or 2 rating always . Can someone please help how to improve target rating .

What are the key points i should follow to get maximum rating.

 

Thanks ,

Manjit kaur 

Re: How to get a higher target rating

April 7, 2012 - 12:05am #5

The major problem is that we want to track a "real world" object.
So the buckle is not printed or on screen.

It's manufactured and on someone's pants ;)

Therefore it's impossible to change anything at the layout or the structure...
That's bad for our project, I know...

So, in short, there's probably no way to "mark" some sharp edges or something or an insider tipp to get at least an "ok" tracking rate?

Thanks for your help, it's very appreciated :)

Re: How to get a higher target rating

April 3, 2012 - 8:12pm #4

The first and third images should track well. Are you printing these targets, or trying to capture them from your computer screen? - print them.

Computer screens can be tricky when there is a light background because they tend to 'blow out' the whites.

Re: How to get a higher target rating

April 2, 2012 - 11:22pm #3

Hi David,

thanks for your fast response.
I played a little with Photoshop and tried to add some "distortions" to the reference image and removed the 3D effects.

Now it's at least possible to detect the buckle but tracking doesn't work well.

It's a little bit difficult to figure out what could be a good pattern or method to optimize an existing object with repetitive patterns.
I wish we could change the buckle, but I think this will remain a dream :)

Maybe you could give me some few more hints on this topic.
I attached some new samples for you ;)

Thanks

Re: How to get a higher target rating

April 1, 2012 - 1:01pm #2

You can try increasing the complexity of the gold region and/or add a pattern to the black region. Vuforia looks for sharp transitions, like corners. It also looks for contrast variation.

A pattern like this performs well..

Take a look at the target analysis of your image in the TMS that depicts the descriptors ( the yellow crosses ). This will show you what type of features are detected. I've also attached a sheet of hatch types that you can analyze.

Be aware that Vuforia is designed for tracking planar images, not 3D surfaces. So if your buckle is contoured, your should isolate a flat region to serve as the target.

Also it's often worthwhile to test targets w/ moderate ratings. They may perform better than expected.

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