Method and apparatus for motion sensing of a handheld device relative to a stylus

摘要

A handheld device and method of operation for determining motion of the handheld device relative to a stylus is presented, in which the stylus is used to provide a frame of reference for the handheld device rather than as a user input device. Stylus orientation data, descriptive of an absolute orientation of a stylus, and handheld device orientation data, descriptive of an absolute orientation of the handheld device, are used to determine motion of the handheld device relative to the stylus. The handheld device has orientation and/or motion sensors, a communication module operable to receive stylus orientation data, and a processor operable to determine the motion or orientation of the handheld device relative to the stylus and execute an application dependent thereon.

主权项

1. A method for determining motion of a handheld device relative to a stylus, the method comprising:
receiving, from the stylus, stylus orientation data comprising data descriptive of an absolute orientation of the stylus; determining handheld device orientation data, descriptive of an absolute orientation of the handheld device, from signals from sensors of the handheld device; sensing local motion of the handheld device, the sensing generating local motion data descriptive of handheld device motion in a frame of reference of the handheld device; calculating a relative orientation between the handheld device and the stylus from the local motion data and the stylus orientation data; determining motion of the handheld device relative to the stylus from the relative orientation; and in response to user input, selecting if a software application executed on the handheld device is to be controlled in response to an absolute motion of the handheld device or in response to the determined motion of the handheld device relative to the stylus.