Using Device Tracking with Image Targets
The Device Tracker improves tracking robustness by using features of the environment surrounding the target. It enables you to use smaller targets and allows for tracking targets farther away from the camera. It additionally, enables Extended Tracking where your target can be tracked even when the Image Target is no longer in the camera view.
See: Device Tracker
Using Virtual Buttons with Image Targets
Virtual Buttons enable you to know when a specific area of the target image has been covered by the user. They provide a way to make Image Targets interactive. The following articles explain how to define and configure Virtual Buttons and how to add them to an Image Target.
See: How To Implement Virtual Buttons
Using Multiple Image Targets Simultaneously
For your specific scenarios and better use cases, Vuforia offers simultaneous tracking of targets and target types. You can also manage the number of tracked targets to limit the performance strain on the devices. Let multiple Image Target cards activate based on proximity or deliver an event when all targets have been found and collected to provide your users an immersive and interactive experience.
Visit Detect and Track Multiple Targets Simultaneously for more information.
Image Target API Overview
The ImageTarget is tracked by the ObjectTracker as part of the ObjectTarget trackable types. The corresponding TrackableResult (in this case a ImageTargetResult) returns the tracking data of the Image Target.
Please, refer to the ObjectTracker API Overview for more information.