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head tracking system

A technology of head and head position, applied in the field of head tracking system

Active Publication Date: 2018-05-08
HARMAN BECKER AUTOMOTIVE SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the geometric arrangement used in this patent application, only small head rotations of about + / - 20° can be detected

Method used

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Embodiment Construction

[0035] exist figure 1 In , a head tracking system 2 is schematically shown. The head tracking system 2 is used to determine the absolute head position of the user's head 3 . The user and the head tracking system 2 are located inside the vehicle 1 .

[0036] The absolute head position can be determined using the first positioning system 10 . Such a first positioning system 10 comprises a reference unit 11 fixedly mounted remote from the head 3 and a positioning unit 12 attached to the head 3 . Since the reference unit 11 is not attached to the head 3, it can be used to define a first coordinate system of the head position ( figure 1 not shown). The absolute head position can then be defined by, for example, the first lateral rotation angle 40, which defines the figure 1 The axis marked A in , is rotated away from the orientation directly facing the reference unit 11 . Of course, the zero first lateral rotation angle may be defined relative to any other direction (eg head ...

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Abstract

The invention relates to a head tracking system (2) for determining the absolute head position of a user's head (3). The head tracking system includes a first positioning system (10) and a second positioning system (20). The first positioning system includes a reference unit (11) fixedly mounted remote from the head (3) and defining a first coordinate system (5), and also includes a reference unit (11) attached to the head and configured to communicate with the reference unit (11) A positioning unit (20) to create position data comprising an indicator indicating the position of the head in a first coordinate system (5) when the positioning unit is located within the field of view (8) of the reference unit (11). The second positioning system (20) includes a digital compass (21) attached to the head (3) and configured to establish second position data including an indication of the head in a second coordinate system (6) An indicator of the location. The head tracking system also includes a head position determination module configured to determine an absolute head position based on at least one of the first position data and the second position data.

Description

technical field [0001] The present application relates to a head tracking system and a method of determining an absolute head position of a user. Background technique [0002] Head tracking systems are known which determine the position of the head, eg by detecting different types of movements of the head. For example, a gyroscope is used to detect the rotation of the head about the longitudinal axis of the head, ie in the horizontal plane of the head. Use this gyroscope to detect angular acceleration. [0003] EP2012170A1 discloses a head tracking system in which a position sensitive device (PSD) and a light source such as a light emitting diode (LED) are used to correct for drift occurring in a gyroscope. With the geometrical arrangement used in this patent application, only small head rotations of about + / - 20° can be detected. The limiting factor is the field of view of the LED relative to the PSD. The light spot produced by the LED falls on the PSD only within a lat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00G01B21/00
CPCG02B27/0093G06F3/012H04S7/304H04R2499/13G01B21/16G06F17/00
Inventor W.赫斯T.迈耶P.康泽曼
Owner HARMAN BECKER AUTOMOTIVE SYST
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