Issues using augment image exemple with an android emulator virtual scene

Hi,
I'm experimenting ARCore, and because i don't have a compatible phone for the moment, i'm forced to use an android emulator.
The HelloAR example works fine, but when it come to the augment images example, i am unable to detect the images that are on the scene.

I directly imported the images from the ARCore Unity package examples in my emulator like that :


and here is what i get while in the app :


when i display m_TempAugmentedImages.Count
where m_TempAugmentedImages is filled by
Session.GetTrackables<AugmentedImage>(m_TempAugmentedImages, TrackableQueryFilter.Updated);
i get 0.

Is it because Augment Images is'nt compatible with an android emulator, or does the problem come from something else ?

I hope someone will be able to help me !