公开(公告)号：US11828818B2

公开(公告)日：2023-11-28

申请号：US17895254

申请日：2022-08-25

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Andrey Zobenko ,  Gwon Sedo ,  Jungwoong Yoon

IPC: G01R33/00

CPC classification number: G01R33/0035

Abstract: A method of calibrating a magnetometer may include; obtaining at least four measurement values using the magnetometer, calculating a center and a radius of a sphere in accordance with the measurement values, wherein the center and the radius of the sphere correspond to an internal magnetic field associated with an electronic device including the magnetometer, and calibrating an output of the magnetometer in accordance with the center of the sphere.

公开(公告)号：US10564177B2

公开(公告)日：2020-02-18

申请号：US15337531

申请日：2016-10-28

Applicant: Samsung Electronics Co., Ltd.

Inventor： Xue Li ,  Linbo Li ,  Andrey Zobenko ,  Seongwook Song

IPC: G01P15/18

Abstract: A system to recognize user activity includes a filter to form a gravity measurement from a three-dimensional (3D) accelerometer measurement of a user activity; a body component extractor to form a body measurement of the user activity by removing the gravity measurement from the 3D accelerometer measurement; a rotation matrix calculator to form a rotation matrix that is used to rotate the extracted gravity to align with a predetermined direction, and to rotate the 3D accelerometer measurements and the body measurement to be the input to features determiner module; and a features determiner to determine values of a predetermined number of features of the user activity based on the rotated 3D accelerometer measurement and the rotated body measurement in which the predetermined number of features are invariant under arbitrary rotation of the accelerometer measurement around the predetermined direction.