Embodiments of present disclosure disclose a method for updating geomagnetic information performed at a computing device, which belong to the field of electronic technologies. The method includes: receiving target geomagnetic information and target location assistance information that are transmitted by a terminal during positioning; determining a target geographical location corresponding to the target location assistance information in a case that geomagnetic information corresponding to a current geographical location of the terminal is invalid; and updating geomagnetic information corresponding to the target geographical location according to the target geomagnetic information in a prestored correspondence between a geographical location and geomagnetic information. According to the embodiments of the present disclosure, efficiency of updating geomagnetic information can be improved.

An image capturing apparatus comprises an angular velocity detection sensor that detects an angular velocity, an acceleration detection sensor that detects an acceleration, a motion vector detection unit that detects a motion vector on the basis of an image captured by the image capturing apparatus; and a calculation unit that calculates an orientation angle of the image capturing apparatus on the basis of a detection value from the angular velocity detection sensor, a detection value from the acceleration detection sensor, and a detection value from the motion vector detection unit, wherein the calculation unit corrects an output of the angular velocity detection sensor using the detection value obtained by the motion vector detection unit, and calculates an orientation angle of the image capturing apparatus on the basis of the corrected value.

An image capturing apparatus comprises an angular velocity detection sensor that detects an angular velocity, an acceleration detection sensor that detects an acceleration, a motion vector detection unit that detects a motion vector on the basis of an image captured by the image capturing apparatus; and a calculation unit that calculates an orientation angle of the image capturing apparatus on the basis of a detection value from the angular velocity detection sensor, a detection value from the acceleration detection sensor, and a detection value from the motion vector detection unit, wherein the calculation unit corrects an output of the angular velocity detection sensor using the detection value obtained by the motion vector detection unit, and calculates an orientation angle of the image capturing apparatus on the basis of the corrected value.

There is provided an information processing apparatus, a program, and an information processing method that are capable of achieving autonomous positioning by geomagnetism without requiring a geomagnetic map, the information processing apparatus including: an acquisition unit; and a calculation unit. The acquisition unit acquires a spatial magnetic gradient and a temporal magnetic change. The calculation unit estimates a motion vector on the basis of the magnetic gradient and the magnetic change.

There is provided an information processing apparatus, a program, and an information processing method that are capable of achieving autonomous positioning by geomagnetism without requiring a geomagnetic map, the information processing apparatus including: an acquisition unit; and a calculation unit. The acquisition unit acquires a spatial magnetic gradient and a temporal magnetic change. The calculation unit estimates a motion vector on the basis of the magnetic gradient and the magnetic change.

A method for estimating the harmonization values of a magnetometer installed in a mobile machine, said magnetometer being associated with its reference coordinate system XM, YM, ZM, said method, implemented by an electronic device, comprising acquiring magnetic field values measured by the magnetometer and determining the horizontal harmonization (hx, hy) by: estimating a first angle equal to the angle between XM and the large axis of an ellipse, defined in the plane comprising the two axes XM, ZM, by said acquired field values; determining hy as being equal to said first estimated angle, estimating a second angle equal to the angle between YM and the large axis of an ellipse defined, in the plane comprising the two axes Y.sub.M, Z.sub.M, by said acquired field vector values; and determining—hx as being equal to said second estimated angle.

A method for estimating the harmonization values of a magnetometer installed in a mobile machine, said magnetometer being associated with its reference coordinate system XM, YM, ZM, said method, implemented by an electronic device, comprising acquiring magnetic field values measured by the magnetometer and determining the horizontal harmonization (hx, hy) by: estimating a first angle equal to the angle between XM and the large axis of an ellipse, defined in the plane comprising the two axes XM, ZM, by said acquired field values; determining hy as being equal to said first estimated angle, estimating a second angle equal to the angle between YM and the large axis of an ellipse defined, in the plane comprising the two axes Y.sub.M, Z.sub.M, by said acquired field vector values; and determining—hx as being equal to said second estimated angle.

According to an example aspect of the present invention, there is provided a method and system for determining and tracking an indoor position of an object, the method comprising: using a primary position indication, based on signals received from an external positioning system of at least two different positions of said object to calibrate tracking of a secondary position indication, which is an indoor position, and wherein the tracking of the secondary position comprises: recording acceleration data of a second part of the object, integrating said acceleration data, determining a characteristic position of the cyclically moving second part of the object in subsequent cycles, measuring a geomagnetic first orientation of the second part of the object in said characteristic position, determining the second direction of movement of the first part of the object, computing a velocity of the object in any direction based on the acceleration data, and determining the secondary position indication of said object based on said direction data and said velocity data.

According to an example aspect of the present invention, there is provided a method and system for determining and tracking an indoor position of an object, the method comprising: using a primary position indication, based on signals received from an external positioning system of at least two different positions of said object to calibrate tracking of a secondary position indication, which is an indoor position, and wherein the tracking of the secondary position comprises: recording acceleration data of a second part of the object, integrating said acceleration data, determining a characteristic position of the cyclically moving second part of the object in subsequent cycles, measuring a geomagnetic first orientation of the second part of the object in said characteristic position, determining the second direction of movement of the first part of the object, computing a velocity of the object in any direction based on the acceleration data, and determining the secondary position indication of said object based on said direction data and said velocity data.

Systems and methods are presented for establishing a communication link between two or more electronic devices. A portable eyewear electronic device is configured to communicate with a handheld electronic device, such as a ring, that in turn is retained by an accessory electronic device to establish a wired communication link. The accessory electronic device may be retained or housed by a second accessory electronic device, such as a remote control or wearable device.