Every time you start a new motion tracking session, the tracking starts over and reports its position relative to its most recent starting position. Motion tracking does not understand the actual area around it. For example, if you took a photo of a building from far away and then took another photo from closer up, it would be possible to calculate the distance the camera moved based on the change in size and position of the building in the photos. This is done using a type of pattern recognition that looks for moving objects.
The gyroscope and accelerometers are used in a similar manner to how Android detects if the device is in a portrait or landscape orientation, but Tango also uses the wide angle camera to estimate rotation and linear acceleration more accurately. Motion Tracking uses cameras and sensors such as the accelerometer, but does not save any images or send information over the network. Motion Tracking adds capabilities to understand the movement of your device while you use an app. By combining depth perception with motion tracking, you can also measure distances between points in an area that aren't in view at the same time as you move between them. A game might want to detect when the user is approaching a wall or other object in the area and have that be part of the gameplay. The depth data allows an application to understand the distance of visible objects to the device. Walk around a building with a Tango device and it can do something similar.
Human beings also learn to recognize their environment by noticing the features around them a doorway, a staircase, the way to the nearest restroom. It's similar to how a mouse works, but instead of moving around on a flat surface, the world is your mousepad. Walk around with a device and move it forward, backward, up, down, or tilt it in any direction, and it can tell you where it is and which way it's facing. This means that a Tango device can track its own movement and orientation through 3D space. The goal is to give mobile devices a human-like understanding of space and motion by using three core technologies: motion tracking, area learning, and depth perception. Chat with people 1:1 or join a casual conversation in our public chat rooms.Tango brings a new kind of awareness to the Android device platform by adding depth sensors, advanced computer vision and image processing. Share photos, videos with your followers and see updates from others.
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