# US 2014/0152550 A1 · Precision position tracking device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152550 A1 - Document ID: US20140152550A1 - Status: Published application - Kind: A1 - Application number: 14/073,037 - Filed: 2013-11-06 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: WorldViz, Inc. - Applicants: WorldViz LLC - Inventors: Andrew C. Beall; Matthias Pusch - Web page: https://patentgrep.com/patent/US20140152550A1 ## CPC - G06F 3/012: {Head tracking input arrangements} - G01S 7/4808: {Evaluating distance, position or velocity data} - G01S 17/46: Indirect determination of position data - G06F 3/005: {Input arrangements through a video camera} - G06V 20/52: Surveillance or monitoring of activities, e.g. for recognising suspicious objects (recognising microscopic objects G06V20/69) - H04N 7/183: {for receiving images from a single remote source} - H04N 23/20: for generating image signals from infrared radiation only - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Embodiment of a lightweight and compact wireless precision position tracking device and a precision position tracking motion capture system are described. Optionally, the wireless precision position tracking device is configured to be worn by a user. The wireless precision position tracking device may be configured to emit optical light from two or more respective markers, where the light from one of the markers is distinguishable from light from another of the markers. ## Claims ### Claim 1 A precision positioning tracking apparatus, comprising: a head mountable system, comprising: a housing configured to be worn by a person in a head region; two or more infrared Light-Emitting Diodes (LED); a battery; a position tracking device powered by the battery and positioned at least in part in the housing, the position tracking device configured to: provide orientation information to a remote device; cause a first infrared LED in the two or more infrared LEDs to emit a first repetitive pattern of infrared light pulses, wherein the first repetitive pattern of infrared light pulses comprises: a first combination of light pulses over a first period of time; and cause a second infrared LED in the two or more infrared LEDs to emit a second repetitive pattern of infrared light pulses, wherein the second repetitive pattern of infrared light pulses comprises: a second combination of light pulses over a second period of time, and wherein the second combination of light pulses is distinguishable from the first combination of light pulses, and wherein a beginning of each pattern in the first repetitive pattern and the second repetitive pattern occurs at substantially the same time. ### Claim 2 (depends on 1) The precision positioning tracking apparatus of claim 1, further comprising: the remote device, wherein the remote device is configured to: receive image data from one or more cameras; detect from the image data two or more distinct patterns of infrared LED light pulses; identify from the two or more distinct patterns of detected infrared LED light pulses the presence of the first signal pattern and the second signal pattern; and, calculate a first orientation of the positioning tracking device based at least in part on the identified presence of the first signal pattern and the second signal pattern. ### Claim 3 (depends on 2) The precision positioning tracking apparatus of claim 2, wherein the image data comprises multiple frames. ### Claim 4 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein the positioning tracking device is configurable to generate eight distinguishable signal patterns. ### Claim 5 (depends on 1) The precision positioning tracking apparatus of claim 1, the precision positioning tracking apparatus further configured to: receive image data from one or more cameras; and detect at least one pattern of one or more infrared LED light pulses from the image data. ### Claim 6 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein at least one pulse period comprises a distinguishing characteristic with respect to the first repetitive pattern. ### Claim 7 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein the first repetitive pattern of infrared light pulses comprise light intensity state transitions. ### Claim 8 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein the housing is configured to be attached to an eyeglass frame. ### Claim 9 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein the precision position tracking device is configured to provide orientation information corresponding to at least one eye of the person. ### Claim 10 (depends on 1) The precision positioning tracking apparatus of claim 1, wherein the precision position tracking device is configured to provide orientation information corresponding to a head position of the person. ### Claim 11 A precision positioning tracking apparatus, comprising: a positioning tracking device, comprising: two or more infrared Light-Emitting Diodes (LED); a housing configured to be worn by a person in a head region; a battery; a precision position tracking device powered by the battery and positioned at least in part in the housing, the precision position tracking device configured to: cause a first infrared LED in the two or more LEDs to emit a first pattern of infrared light pulses, wherein the first pattern of infrared light pulses comprises: a first combination of light pulses over a first period of time; and cause a second infrared LED in the two or more LEDs to emit a second repetitive pattern of infrared light pulses, wherein the second repetitive signal pattern of infrared light pulses comprises: a second combination of light pulses over a second period of time, and wherein the second combination of light pulses is distinguishable from the first combination of light pulses. ### Claim 12 (depends on 11) The precision positioning tracking apparatus of claim 11, further comprising a tracking system, wherein the tracking system is configured to: receive image data from one or more cameras; detect from the image data six or more infrared LED light pulses; identify from the six or more detected infrared LED light pulses the presence of the first signal pattern and the second signal pattern; and calculate a first position of the precision positioning tracking device based at least in part on the identified presence of the first signal pattern and the second signal pattern. ### Claim 13 (depends on 12) The precision positioning tracking apparatus of claim 12, wherein the image data comprises multiple frames. ### Claim 14 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein the positioning tracking device is configurable to generate eight distinguishable signal patterns. ### Claim 15 (depends on 11) The precision positioning tracking apparatus of claim 11, further comprising a tracking system, wherein the tracking system is configured to: receive image data from one or more cameras; and detect at least one pattern of one or more infrared LED light pulses from the image data. ### Claim 16 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein at least one pulse period comprises a distinguishing characteristic of the pattern. ### Claim 17 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein the first pattern of infrared light pulses comprise light intensity state transitions. ### Claim 18 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein the housing is configured to be attached to an eyeglass frame. ### Claim 19 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein the position tracking device is configured to provide orientation information corresponding to at least one eye of the person. ### Claim 20 (depends on 11) The precision positioning tracking apparatus of claim 11, wherein the position tracking device is configured to provide orientation information corresponding to a head position of the person. ### Claim 21 A method, comprising: receiving image data from one or more cameras; detecting from the image data two or more distinct patterns of light pulses; identifying from the two or more distinct patterns of detected light pulses a presence of a first signal pattern, emitted by a first light source, and a second signal pattern, emitted by a second light source; and calculating a first orientation of at least a portion of a person's head based at least in part on the identified presence of the first signal pattern and the second signal pattern. ### Claim 22 (depends on 21) The method as defined in claim 21, wherein the first light source is an infrared LED. ### Claim 23 (depends on 21) The method as defined in claim 21, wherein the first light source and the second light source are positioned on either side of the user's head.