我正在开发一款增强现实应用，可在Google的Project Tango平板电脑和普通的Android设备上使用。普通设备上的AR由Vuforia提供支持，因此它的库可以在应用程序的开发中使用。
虽然Tango的功能提供了创建无标记AR系统的独特机会，但Pose数据具有显着的漂移，这使得由于数据的不稳定性而难以证明Tango的发展。
当Vuforia被研究以最终包含在应用程序中时，我遇到了Extended Tracking功能。它使用一些先进的计算机视觉技术，在屏幕上没有AR标记的情况下提供设备位置的暂定信息。我试用了这个演示，它实际上很棒。理性上相当准确，漂移极小（特别是与Tango的姿势数据相比！）
我想在应用程序的Tango版本中实现此扩展跟踪功能，但在查看文档后，似乎利用扩展跟踪功能的唯一方法是在查看AR标记时激活它，以及然后，一旦标记从视图中消失，该功能就会接管。
有没有办法激活此扩展跟踪功能而无需AR标记来源其原始位置，只需使用它来稳定和纠正Tango姿势数据中的错误？这似乎是解决我已经提出的漂移问题的最现实的解决方案，而且我真的希望能够利用这项技术。
答案 0 :(得分：2)
this is my first answer on stack overflow, so I hope it can help! I too have asked myself the same question for vuforia, as it can often be more stable with extended tracking than with a marker, like when far from a marker, or/and at an angle for example, it can be unstable, if I then cover up the marker, therefor forcing the extended tracking, it works better! I've not come across a way to just use extended tracking, but I haven't looked very far.
My suggestion is that you look into maybe using a UDT (user defined target) In the vuforia examples, you can find how to use UDT. They are made so that the user can take a photo of whatever he likes as a target. but what you could maybe do, is take this photo automatically, without user input, and the use this UDT, and the extended tracking from the created target.
A suggestion I thought useful. Personally I find the tracking of the tango amazing and much better than vuforia's extended tracking (to be expected with the extra sensors) But i suppose it all depends on the environment.
Good luck, hope this suggestion could work,
Beau