Apple to use augmented reality
Apple has filed for a US patent in which consecutive camera images and associated inertial movement are combined to give continuous indoor navigation.
The method involves taking measurements of image and inertial data on a device and transferring it to a processor as a 'first window'. Then another set of variables associated with a 'second window' of time is recorded, with the first and second windows consecutively overlapping in time. This enables a post-processing module to determine the position and motion of the device, based on the transferred information.
This 'visual-based inertial navigation' - using on-board cameras, gyros and accelerometers - could be prohibitively demanding in processing and storage requirements, but this is overcome by discarding 'Window 1' as soon as 'Window 3' is obtained, and so-on. The 'sliding window inverse filter' (SWF) module is designed to minimise computational load.
The bottom-line, if this patent is fully realised, would be a device that, without access to GNSS - for example, indoors - could continually determine position and orientation in real time, down to a claimed accuracy of centimetres.
Details from the links below . .