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Can't get Multi-Targets example to work with custom device database

July 23, 2013 - 11:22pm #1

Hi,

I got the demo Multi-Targets to work just fine. It recognises the FlakesBox really well.

However, when I modify the FlakesBox model with my own model, I simply cannot get it to work.

Here is an image of one side of my model:

http://i39.tinypic.com/5wm6tc.png

All six sides are the same (so it looks a bit like a white Rubik's cube)

I set the width of the model to 700. I don't know if this is right or not. My cube is 5.5cm x 5.5cm x 5.5cm in real life.

Can anyone please help me to recognise these Rubik's cube -like objects?

Many thanks in advance,

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 1:03pm #8

AlessandroB wrote:

Using the color image or its black-and-white version should not make any difference;

what matters is the amount of features in the image, their contrast and their distribution across the image;

also, one of the main issues with the Rubik's cube face is that they contain a repetition pattern (i.e. the squares and lines are repeated in 3 rows and 3 columns); such repetition patterns can degrade the rating of your image.

Adding some extra graphical details would also be a way of breaking such repetitions.

 

 

Great insight.

Many thanks again,

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 12:41pm #7

Using the color image or its black-and-white version should not make any difference;

what matters is the amount of features in the image, their contrast and their distribution across the image;

also, one of the main issues with the Rubik's cube face is that they contain a repetition pattern (i.e. the squares and lines are repeated in 3 rows and 3 columns); such repetition patterns can degrade the rating of your image.

Adding some extra graphical details would also be a way of breaking such repetitions.

 

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 12:30pm #6

Hi Alessandro,

Do you know the answer to this?

If I upload black and white images of a 3d cube, can I get the Android application to recognise in black and white (and not colour!)

Do you think this would improve my chances of my Rubik's cube being recognised?

Many thanks for your help,

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 3:04am #5

Hi Alessandro,

You have been really helpful.

Thank you so much.

If I make any progress, I'll report back here.

 

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 1:43am #4

 

the results that you get (the image is not suitable for detection...) from the Target Manager already indicate that an image like a Rubik's cube face is not easily detectable as it is.

the only option would be to add some extra graphical details to the faces (instead of using the cube "as is").

 

Can't get Multi-Targets example to work with custom device datab

July 24, 2013 - 1:32am #3

Hi Alessandro,

Many thanks for the very useful information.

When I followed your instructions, I got:

This image is not suitable for detection and tracking. You should consider an alternative image or significantly modify this one. Your image should have the following properties:

  • High feature density
  • Uniform feature distribution
  • High local contrast
  • No repetitive patterns

Could you please suggest a way of detecting a Rubik's cube?

Many thanks for your help,

Can't get Multi-Targets example to work with custom device datab

July 23, 2013 - 11:29pm #2

Hi, what is the "star rating" of the images ? If you click on each face of the cube in the Target Manager, you will see the rating; frm the picture, it looks like you might have low rated targets, which may be difficult to detect.

Concerning the size: if your cube is 5.5 cm, and you start with from the MultiTarget example, I would recommend to use "millimeters" as unit, i.e. assingn a size of 55 to each side of the cube (instead of 700)

 

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