VR body tracking without external sensors

    公开(公告)号:US10777006B2

    公开(公告)日:2020-09-15

    申请号:US15791029

    申请日:2017-10-23

    Abstract: Plural individual sensor assemblies are engaged with respective parts of a person's body. Each assembly may include accelerometers, magnetometers, and gyroscopes. Sensor data is fused together to get the orientation at each body location. To simplify, the body is assumed to consist of rigid bars of known length connected with ball joints so that once the relative orientations of all bars are given by the respective assemblies, body pose can be computed. Then the body pose is translated as a virtual body into a virtual world either by a ray cast method that anchors a foot of the virtual body to the ground assuming infinite gravity and infinite friction and then translating the other body parts to make the ground contact point fixed, or by implementing an approximate dynamics physics engine on the virtual body. The technique may be used in VR location-based entertainment and for motion capture.

    EVENT DRIVEN SENSOR (EDS) TRACKING OF LIGHT EMITTING DIODE (LED) ARRAY

    公开(公告)号:US20220057859A1

    公开(公告)日:2022-02-24

    申请号:US17519177

    申请日:2021-11-04

    Inventor: Sergey Bashkirov

    Abstract: An event driven sensor (EDS) is used for simultaneous localization and mapping (SLAM) and in particular is used in conjunction with a constellation of light emitting diodes (LED) to simultaneously localize all LEDs and track EDS pose in space. The EDS may be stationary or moveable and can track moveable LED constellations as rigid bodies. Each individual LED is distinguished at a high rate using minimal computational resources (no image processing). Thus, instead of a camera and image processing, rapidly pulsing LEDs detected by the EDS are used for feature points such that EDS events are related to only one LED at a time.

    Variable magnetic field-based position

    公开(公告)号:US10653943B2

    公开(公告)日:2020-05-19

    申请号:US16216204

    申请日:2018-12-11

    Abstract: To derive three dimensional (3D) position and orientation of a 3-axis (or more) magnetometer/accelerometer device (such as may be implemented in VR or AR headset or computer game controller) without line of sight constraints, a spinning magnetic field is used to discriminate and remove the external (Earth's) magnetic field from the spinning magnetic field. This reduces the problem to finding the distance to the source of the magnetic field using a calibration table (or formula), finding two angles describing the deviation of the magnetic sensor from the axis of rotation of the spinning magnetic field and the phase around this axis, and from these values deriving the orientation of the sensor.

    MODULAR HIERARCHICAL VISION SYSTEM OF AN AUTONOMOUS PERSONAL COMPANION

    公开(公告)号:US20190102667A1

    公开(公告)日:2019-04-04

    申请号:US15721637

    申请日:2017-09-29

    Abstract: An autonomous personal companion utilizing a method of object identification that relies on a hierarchy of object classifiers for categorizing one or more objects in a scene. The classifier hierarchy is composed of a set of root classifiers trained to recognize objects based on separate generic classes. Each root acts as the parent of a tree of child nodes, where each child node contains a more specific variant of its parent object classifier. The method covers walking the tree in order to classify an object based on more and more specific object features. The system is further comprised of an algorithm designed to minimize the number of object comparisons while allowing the system to concurrently categorize multiple objects in a scene.

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