Patent Publication Number: US-2023161959-A1

Title: Ring motion capture and message composition system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of U.S. Application Serial No. 17/004,344 filed on Aug. 27, 2020, and claims priority to U.S. Provisional Application Serial No. 62/907,679 filed on Sep. 29, 2019, the contents of which are incorporated fully herein by reference. 
    
    
     TECHNICAL FIELD 
     Examples set forth in the present disclosure relate to portable electronic devices, including wearable devices such as eyewear. More particularly, but not by way of limitation, the present disclosure describes systems and methods for composing a message based on the motion of a handheld electronic device such as a ring. 
     BACKGROUND 
     Many types of computers and electronic devices available today, including mobile devices (e.g., smartphones, tablets, and laptops), handheld devices (e.g., smart rings), and wearable devices (e.g., smartglasses, digital eyewear, headwear, headgear, and head-mounted displays), include internal sensors for collecting information about the location, orientation, motion, and heading of the device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Features of the various implementations disclosed will be readily understood from the following detailed description, in which reference is made to the appending drawing figures. 
       A reference numeral is used with each element in the description and throughout the several views of the drawing. When a plurality of similar elements is present, a single reference numeral may be assigned to like elements, with an added lower-case letter referring to a specific element. 
       The various elements shown in the figures are not drawn to scale unless otherwise indicated. The dimensions of the various elements may be enlarged or reduced in the interest of clarity. The several figures depict one or more implementations and are presented by way of example only and should not be construed as limiting. Included in the drawing are the following figures: 
         FIG.  1 A  is a side view (right) of an example hardware configuration of an eyewear device that may be utilized in a message composition and sharing system; 
         FIG.  1 B  is a top, partly sectional view of a right chunk of the eyewear device of  FIG.  1 A  depicting a right visible-light camera, and a circuit board; 
         FIG.  1 C  is a side view (left) of an example hardware configuration of the eyewear device of  FIG.  1 A , which shows a left visible-light camera; 
         FIG.  1 D  is a top, partly sectional view of a left chunk of the eyewear device of  FIG.  1 C  depicting the left visible-light camera, and a circuit board; 
         FIGS.  2 A and  2 B  are rear views of example hardware configurations of an eyewear device utilized in the message composition and sharing system; 
         FIG.  3    is a diagrammatic depiction of a three-dimensional scene, a left raw image captured by a left visible-light camera, and a right raw image captured by a right visible-light camera; 
         FIG.  4    is a functional block diagram of an example message composition and sharing system including an eyewear device, a mobile device, a handheld device (e.g., a smart ring), and a server system connected via various networks; 
         FIG.  5    is a diagrammatic representation of an example hardware configuration for a mobile device of the message composition and sharing system of  FIG.  4   ; 
         FIG.  6    is a diagrammatic representation of an example hardware configuration for a handheld device (e.g., a smart ring) of the message composition and sharing system of  FIG.  4   ; 
         FIG.  7    is a schematic view of an example hardware configuration for a handheld device (e.g., a smart ring) of the message composition and sharing system of  FIG.  4   ; and 
         FIG.  8    is an illustration of a handheld device (e.g., a smart ring) moving along a course and a trace on a displayed keyboard, wherein the displayed trace is correlated with the course in near real-time, in the message composition and sharing system of  FIG.  4   . 
     
    
    
     DETAILED DESCRIPTION 
     Various implementations and details are described with reference to an example: a message composition and sharing system for presenting a keyboard on a display (e.g., projected onto at least one lens of a portable eyewear device), collecting course data associated with a course traveled by a hand in motion holding a handheld device (e.g., a ring), overlaying a trace onto the displayed keyboard, such that the trace is correlated in near real-time with the course being traveled by the hand (e.g., for selecting alphanumeric characters in a swiping motion from letter to letter), identifying and selecting candidate words from a set, presenting as text the highest-ranked word for each course, composing a message, and sending the message. In addition to the message composition and sharing system, the systems and methods described herein may be applied to and used with any of a variety of systems, especially those in which a user desires to compose and send a message using a handheld device and a displayed keyboard without necessarily using a mobile telephone. 
     The following detailed description includes systems, methods, techniques, instruction sequences, and computing machine program products illustrative of examples set forth in the disclosure. Numerous details and examples are included for the purpose of providing a thorough understanding of the disclosed subject matter and its relevant teachings. Those skilled in the relevant art, however, may understand how to apply the relevant teachings without such details. Aspects of the disclosed subject matter are not limited to the specific devices, systems, and method described because the relevant teachings can be applied or practice in a variety of ways. The terminology and nomenclature used herein is for the purpose of describing particular aspects only and is not intended to be limiting. In general, well-known instruction instances, protocols, structures, and techniques are not necessarily shown in detail. 
     The term “coupled” or “connected” as used herein refers to any logical, optical, physical, or electrical connection, including a link or the like by which the electrical or magnetic signals produced or supplied by one system element are imparted to another coupled or connected system element. Unless described otherwise, coupled or connected elements or devices are not necessarily directly connected to one another and may be separated by intermediate components, elements, or communication media, one or more of which may modify, manipulate, or carry the electrical signals. The term “on” means directly supported by an element or indirectly supported by the element through another element integrated into or supported by the element. 
     The orientations of the eyewear device, the handheld device, associated components and any other complete devices incorporating a camera or an inertial measurement unit such as shown in any of the drawings, are given by way of example only, for illustration and discussion purposes. In operation, the eyewear device may be oriented in any other direction suitable to the particular application of the eyewear device; for example, up, down, sideways, or any other orientation. Also, to the extent used herein, any directional term, such as front, rear, inward, outward, toward, left, right, lateral, longitudinal, up, down, upper, lower, top, bottom, side, horizontal, vertical, and diagonal are used by way of example only, and are not limiting as to the direction or orientation of any camera or inertial measurement unit as constructed as otherwise described herein. 
     Additional objects, advantages and novel features of the examples will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following and the accompanying drawings or may be learned by production or operation of the examples. The objects and advantages of the present subject matter may be realized and attained by means of the methodologies, instrumentalities and combinations particularly pointed out in the appended claims. 
     Reference now is made in detail to the examples illustrated in the accompanying drawings and discussed below. 
       FIG.  1 A  is a side view (right) of an example hardware configuration of an eyewear device  100  utilized in a message composition and sharing system, as described herein, which shows a right visible-light camera  114 B for gathering image information. As further described below, two cameras  114 A,  114 B capture image information for a scene from two separate viewpoints. The two captured images may be used to project a three-dimensional display onto a screen for viewing with 3D glasses. 
     The eyewear device  100  includes a right optical assembly  180 B with an image display to present images, such as depth images. As shown in  FIGS.  1 A and  1 B , the eyewear device  100  includes the right visible-light camera  114 B. The eyewear device  100  can include multiple visible-light cameras  114 A,  114 B that form a passive type of three-dimensional camera, such as stereo camera, of which the right visible-light camera  114 B is located on a right chunk  110 B. As shown in  FIGS.  1 C-D , the eyewear device  100  also includes a left visible-light camera  114 A. 
     Left and right visible-light cameras  114 A,  114 B are sensitive to the visible-light range wavelength. Each of the visible-light cameras  114 A,  114 B have a different frontward facing field of view which are overlapping to enable generation of three-dimensional depth images, for example, right visible-light camera  114 B depicts a right field of view  111 B. Generally, a “field of view” is the part of the scene that is visible through the camera at a particular position and orientation in space. The fields of view  111 A and  111 B have an overlapping field of view  813 . Objects or object features outside the field of view  111 A,  111 B when the visible-light camera captures the image are not recorded in a raw image (e.g., photograph or picture). The field of view describes an angle range or extent, which the image sensor of the visible-light camera  114 A,  114 B picks up electromagnetic radiation of a given scene in a captured image of the given scene. Field of view can be expressed as the angular size of the view cone, i.e., an angle of view. The angle of view can be measured horizontally, vertically, or diagonally. 
     In an example, visible-light cameras  114 A,  114 B have a field of view with an angle of view between 15° to 30°, for example 24°, and have a resolution of 480 × 480 pixels. The “angle of coverage” describes the angle range that a lens of visible-light cameras  114 A,  114 B or infrared camera  220  (see  FIG.  2 A ) can effectively image. Typically, the camera lens produces an image circle that is large enough to cover the film or sensor of the camera completely, possibly including some vignetting toward the edge. If the angle of coverage of the camera lens does not fill the sensor, the image circle will be visible, typically with strong vignetting toward the edge, and the effective angle of view will be limited to the angle of coverage. 
     Examples of such visible-light cameras  114 A,  114 B include a high-resolution complementary metal-oxide-semiconductor (CMOS) image sensor and a digital VGA camera (video graphics array) capable of resolutions of 640 p (e.g., 640 × 480 pixels for a total of 0.3 megapixels), 720 p, or 1080 p. Other examples of visible-light cameras  114 A,  114 B that can capture high-definition (HD) still images and store them at a resolution of 1642 by 1642 pixels (or greater); or record high-definition video at a high frame rate (e.g., thirty to sixty frames per second or more) and store the recording at a resolution of 1216 by 1216 pixels (or greater). 
     The eyewear device  100  may capture image sensor data from the visible-light cameras  114 A,  114 B along with geolocation data, digitized by an image processor, for storage in a memory. The left and right raw images captured by respective visible-light cameras  114 A,  114 B are in the two-dimensional space domain and comprise a matrix of pixels on a two-dimensional coordinate system that includes an X-axis for horizontal position and a Y-axis for vertical position. Each pixel includes a color attribute value (e.g., a red pixel light value, a green pixel light value, a blue pixel light value, or combination thereof); and a position attribute (e.g., an X-axis coordinate and a Y-axis coordinate). 
     In order to capture stereo images for later display as a three-dimensional projection, the image processor  912  (shown in  FIG.  4   ) may be coupled to the visible-light cameras  114 A,  114 B to receive and store the visual image information. A timestamp for each image may be added by the image processor  912  or another processor which controls operation of the visible-light cameras  114 A,  114 B, which act as a stereo camera to simulate human binocular vision. The timestamp on each pair of images allows the images to be displayed together as part of a three-dimensional projection. Three-dimensional projections create an immersive, life-like experience that is desirable in a variety of contexts, including virtual reality (VR) and video gaming. 
       FIG.  3    is a diagrammatic depiction of a three-dimensional scene  715 , a left raw image  858 A captured by a left visible-light camera  114 A, and a right raw image  858 B captured by a right visible-light camera  114 B. The left field of view  111 A may overlap, as shown, with the right field of view  111 B. The overlapping field of view  813  represents that portion of the image captured by both cameras  114 A,  114 B. The term ‘overlapping’ when referring to field of view means the matrix of pixels in the generated raw images overlap by thirty percent (30%) or more. ‘Substantially overlapping’ means the matrix of pixels in the generated raw images - or in the infrared image of scene - overlap by fifty percent (50%) or more. As described herein, the two raw images  858 A,  858 B may be processed to include a timestamp, which allows the images to be displayed together as part of a three-dimensional projection. 
     For the capture of stereo images, as illustrated in  FIG.  3   , a pair of raw red, green, and blue (RGB) images are captured of a real scene  715  at a given moment in time - a left raw image  858 A captured by the left camera  114 A and right raw image  858 B captured by the right camera  114 B. When the pair of raw images  858 A,  858 B are processed (e.g., by the image processor  912 ), depth images are generated. The generated depth images may be viewed on an optical assembly  180 A,  180 B of an eyewear device, on another display (e.g., the image display  880  on a mobile device  890 ), or on a screen. 
     The generated depth images are in the three-dimensional space domain and can comprise a matrix of vertices on a three-dimensional location coordinate system that includes an X axis for horizontal position (e.g., length), a Y axis for vertical position (e.g., height), and a Z axis for depth (e.g., distance). Each vertex may include a color attribute (e.g., a red pixel light value, a green pixel light value, a blue pixel light value, or a combination thereof); a position attribute (e.g., an X location coordinate, a Y location coordinate, and a Z location coordinate); a texture attribute, a reflectance attribute, or a combination thereof. The texture attribute quantifies the perceived texture of the depth image, such as the spatial arrangement of color or intensities in a region of vertices of the depth image. 
     In one example, the message composition and sharing system  1000  includes the eyewear device  100 , which includes a frame  105  and a left temple  110 A extending from a left lateral side  170 A of the frame  105  and a right temple  110 B extending from a right lateral side  170 B of the frame  105 . The eyewear device  100  may further include at least two visible-light cameras  114 A,  114 B which may have overlapping fields of view. In one example, the eyewear device  100  includes a left visible-light camera  114 A with a left field of view  111 A, as illustrated in  FIG.  3   . The left camera  114 A is connected to the frame  105  or the left temple  110 A to capture a left raw image  858 A from the left side of scene  715 . The eyewear device  100  further includes a right visible-light camera  114 B with a right field of view  111 B. The right camera  114 B is connected to the frame  105  or the right temple  110 B to capture a right raw image  858 B from the right side of scene  715 . 
       FIG.  1 B  is a top cross-sectional view of a right chunk  110 B of the eyewear device  100  of  FIG.  1 A  depicting the right visible-light camera  114 B of the camera system, and a circuit board.  FIG.  1 C  is a side view (left) of an example hardware configuration of an eyewear device  100  of  FIG.  1 A , which shows a left visible-light camera  114 A of the camera system.  FIG.  1 D  is a top cross-sectional view of a left chunk  110 A of the eyewear device of  FIG.  1 C  depicting the left visible-light camera  114 A of the three-dimensional camera, and a circuit board. Construction and placement of the left visible-light camera  114 A is substantially similar to the right visible-light camera  114 B, except the connections and coupling are on the left lateral side  170 A. As shown in the example of  FIG.  1 B , the eyewear device  100  includes the right visible-light camera  114 B and a circuit board  140 B, which may be a flexible printed circuit board (PCB). A right hinge  126 B connects the right chunk  110 B to a right temple  125 B of the eyewear device  100 . A left hinge  126 A connects the left chunk  110 A to a left temple  125 A of the eyewear device  100 . In some examples, components of the right visible-light camera  114 B, the flexible PCB  140 B, or other electrical connectors or contacts may be located on the right temple  125 B or the right hinge  126 B. 
     The right chunk  110 B includes chunk body  211  and a chunk cap, with the chunk cap omitted in the cross-section of  FIG.  1 B . Disposed inside the right chunk  110 B are various interconnected circuit boards, such as PCBs or flexible PCBs, that include controller circuits for right visible-light camera  114 B, microphone(s), low-power wireless circuitry (e.g., for wireless short range network communication via Bluetooth™), high-speed wireless circuitry (e.g., for wireless local area network communication via WiFi). 
     The right visible-light camera  114 B is coupled to or disposed on the flexible PCB  140 B and covered by a visible-light camera cover lens, which is aimed through opening(s) formed in the frame  105 . For example, the right rim  107 B of the frame  105 , shown in  FIG.  2 A , is connected to the right chunk  110 B and includes the opening(s) for the visible-light camera cover lens. The frame  105  includes a front side configured to face outward and away from the eye of the user. The opening for the visible-light camera cover lens is formed on and through the front or outward-facing side of the frame  105 . In the example, the right visible-light camera  114 B has an outward-facing field of view  111 B (shown in  FIG.  3   ) with a line of sight or perspective that is correlated with the right eye of the user of the eyewear device  100 . The visible-light camera cover lens can also be adhered to a front side or outward-facing surface of the right chunk  110 B in which an opening is formed with an outward-facing angle of coverage, but in a different outwardly direction. The coupling can also be indirect via intervening components. 
     As shown in  FIG.  1 B , flexible PCB  140 B is disposed inside the right chunk  110 B and is coupled to one or more other components housed in the right chunk  110 B. Although shown as being formed on the circuit boards of the right chunk  110 B, the right visible-light camera  114 B can be formed on the circuit boards of the left chunk  110 A, the temples  125 A,  125 B, or the frame  105 . 
       FIGS.  2 A and  2 B  are perspective views, from the rear, of example hardware configurations of the eyewear device  100 , including two different types of image displays. The eyewear device  100  is sized and shaped in a form configured for wearing by a user; the form of eyeglasses is shown in the example. The eyewear device  100  can take other forms and may incorporate other types of frameworks; for example, a headgear, a headset, or a helmet. 
     In the eyeglasses example, eyewear device  100  includes a frame  105  including a left rim  107 A connected to a right rim  107 B via a bridge  106  adapted to be supported by a nose of the user. The left and right rims  107 A,  107 B include respective apertures  175 A,  175 B, which hold a respective optical element  180 A,  180 B, such as a lens and a display device. As used herein, the term “lens” is meant to include transparent or translucent pieces of glass or plastic having curved or flat surfaces that cause light to converge/diverge or that cause little or no convergence or divergence. 
     Although shown as having two optical elements  180 A,  180 B, the eyewear device  100  can include other arrangements, such as a single optical element (or it may not include any optical element  180 A,  180 B), depending on the application or the intended user of the eyewear device  100 . As further shown, eyewear device  100  includes a left chunk  110 A adjacent the left lateral side  170 A of the frame  105  and a right chunk  110 B adjacent the right lateral side  170 B of the frame  105 . The chunks  110 A,  110 B may be integrated into the frame  105  on the respective sides  170 A,  170 B (as illustrated) or implemented as separate components attached to the frame  105  on the respective sides  170 A,  170 B. Alternatively, the chunks  110 A,  110 B may be integrated into temples (not shown) attached to the frame  105 . 
     In one example, the image display of optical assembly  180 A,  180 B includes an integrated image display. As shown in  FIG.  2 A , each optical assembly  180 A,  180 B includes a suitable display matrix  177 , such as a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, or any other such display. Each optical assembly  180 A,  180 B also includes an optical layer or layers  176 , which can include lenses, optical coatings, prisms, mirrors, waveguides, optical strips, and other optical components in any combination. The optical layers  176 A,  176 B, ...  176 N (shown as  176 A-N in  FIG.  2 A  and herein) can include a prism having a suitable size and configuration and including a first surface for receiving light from a display matrix and a second surface for emitting light to the eye of the user. The prism of the optical layers  176 A-N extends over all or at least a portion of the respective apertures  175 A,  175 B formed in the left and right rims  107 A,  107 B to permit the user to see the second surface of the prism when the eye of the user is viewing through the corresponding left and right rims  107 A,  107 B. The first surface of the prism of the optical layers  176 A-N faces upwardly from the frame  105  and the display matrix  177  overlies the prism so that photons and light emitted by the display matrix  177  impinge the first surface. The prism is sized and shaped so that the light is refracted within the prism and is directed toward the eye of the user by the second surface of the prism of the optical layers  176 A-N. In this regard, the second surface of the prism of the optical layers  176 A-N can be convex to direct the light toward the center of the eye. The prism can optionally be sized and shaped to magnify the image projected by the display matrix  177 , and the light travels through the prism so that the image viewed from the second surface is larger in one or more dimensions than the image emitted from the display matrix  177 . 
     In one example, the optical layers  176 A-N may include an LCD layer that is transparent (keeping the lens open) unless and until a voltage is applied which makes the layer opaque (closing or blocking the lens). The image processor  912  on the eyewear device  100   may execute programming to apply the voltage to the LCD layer in order to create an active shutter system, making the eyewear device  100  suitable for viewing visual content when displayed as a three-dimensional projection. Technologies other than LCD may be used for the active shutter mode, including other types of reactive layers that are responsive to a voltage or another type of input. 
     In another example, the image display device of optical assembly  180 A,  180 B includes a projection image display as shown in  FIG.  2 B . Each optical assembly  180 A,  180 B includes a laser projector  150 , which is a three-color laser projector using a scanning mirror or galvanometer. During operation, an optical source such as a laser projector  150  is disposed in or on one of the temples  125 A,  125 B of the eyewear device  100 . Optical assembly  180 B in this example includes one or more optical strips  155 A,  155 B, ...  155 N (shown as  155 A-N in  FIG.  2 B ) which are spaced apart and across the width of the lens of each optical assembly  180 A,  180 B, across a depth of the lens between the front surface and the rear surface of the lens, or a combination thereof. 
     As the photons projected by the laser projector  150  travel across the lens of each optical assembly  180 A,  180 B, the photons encounter the optical strips  155 A-N. When a particular photon encounters a particular optical strip, the photon is either redirected toward the user’s eye, or it passes to the next optical strip. A combination of modulation of laser projector  150 , and modulation of optical strips, may control specific photons or beams of light. In an example, a processor controls optical strips  155 A-N by initiating mechanical, acoustic, or electromagnetic signals. Although shown as having two optical assemblies  180 A,  180 B, the eyewear device  100  can include other arrangements, such as a single or three optical assemblies, or each optical assembly  180 A,  180 B may have arranged different arrangement depending on the application or intended user of the eyewear device  100 . 
     As further shown in  FIGS.  2 A and  2 B , eyewear device  100  includes a left chunk  110 A adjacent the left lateral side  170 A of the frame  105  and a right chunk  110 B adjacent the right lateral side  170 B of the frame  105 . The chunks  110 A,  110 B may be integrated into the frame  105  on the respective lateral sides  170 A,  170 B (as illustrated) or implemented as separate components attached to the frame  105  on the respective sides  170 A,  170 B. Alternatively, the chunks  110 A,  110 B may be integrated into temples  125 A,  125 B attached to the frame  105 . 
     In another example, the eyewear device  100  shown in  FIG.  2 B  may include two projectors, a left projector  150 A (not shown) and a right projector  150 B (shown as projector  150 ). The left optical assembly  180 A may include a left display matrix  177 A (not shown) or a left set of optical strips 155’A, 155’B, ... 155’N (155 prime, A through N, not shown) which are configured to interact with light from the left projector  150 A. Similarly, the right optical assembly  180 B may include a right display matrix  177 B (not shown) or a right set of optical strips 155”A, 155”B, ... 155”N (155 double-prime, A through N, not shown) which are configured to interact with light from the right projector  150 B. In this example, the eyewear device  100  includes a left display and a right display. 
       FIG.  4    is a functional block diagram of an example message composition and sharing system  1000  including an eyewear device  100 , a mobile device  890 , a handheld device  500  (e.g., a ring), and a server system  998  connected via various networks  995  such as the Internet. The system  1000  includes a low-power wireless connection  925  and a high-speed wireless connection  937  between the eyewear device  100  and a mobile device  890  - and between the eyewear device  100  and the ring  500  - as shown. 
     The eyewear device  100  includes one or more visible-light cameras  114 A,  114 B which may be capable of capturing still images or video, as described herein. The cameras  114 A,  114 B may have a direct memory access (DMA) to high-speed circuitry  930 . A pair of cameras  114 A,  114 B may function as a stereo camera, as described herein. The cameras  114 A,  114 B may be used to capture initial-depth images that may be rendered into three-dimensional (3D) models that are texture-mapped images of a red, green, and blue (RGB) imaged scene. The device  100  may also include a depth sensor  213 , which uses infrared signals to estimate the position of objects relative to the device  100 . The depth sensor  213  in some examples includes one or more infrared emitter(s)  215  and infrared camera(s)  220 . 
     The eyewear device  100  further includes two image displays of each optical assembly  180 A,  180 B (one associated with the left side  170 A and one associated with the right side  170 B). The eyewear device  100  also includes an image display driver  942 , an image processor  912 , low-power circuitry  920 , and high-speed circuitry  930 . The image displays of each optical assembly  180 A,  180 B are for presenting images, including still images and video. The image display driver  942  is coupled to the image displays of each optical assembly  180 A,  180 B in order to control the images displayed. The eyewear device  100  further includes a user input device  991  (e.g., a touch sensor or touchpad) to receive a two-dimensional input selection from a user. 
     The components shown in  FIG.  4    for the eyewear device  100  are located on one or more circuit boards, for example a PCB or flexible PCB, located in the rims or temples. Alternatively, or additionally, the depicted components can be located in the chunks, frames, hinges, or bridge of the eyewear device  100 . Left and right visible-light cameras  114 A,  114 B can include digital camera elements such as a complementary metal-oxide-semiconductor (CMOS) image sensor, a charge-coupled device, a lens, or any other respective visible or light capturing elements that may be used to capture data, including still images or video of scenes with unknown objects. 
     As shown in  FIG.  4   , high-speed circuitry  930  includes a high-speed processor  932 , a memory  934 , and high-speed wireless circuitry  936 . In the example, the image display driver  942  is coupled to the high-speed circuitry  930  and operated by the high-speed processor  932  in order to drive the left and right image displays of each optical assembly  180 A,  180 B. High-speed processor  932  may be any processor capable of managing high-speed communications and operation of any general computing system needed for eyewear device  100 . High-speed processor  932  includes processing resources needed for managing high-speed data transfers on high-speed wireless connection  937  to a wireless local area network (WLAN) using high-speed wireless circuitry  936 . In certain examples, the high-speed processor  932  executes an operating system such as a LINUX operating system or other such operating system of the eyewear device  100  and the operating system is stored in memory  934  for execution. In addition to any other responsibilities, the high-speed processor  932  executes a software architecture for the eyewear device  100  that is used to manage data transfers with high-speed wireless circuitry  936 . In certain examples, high-speed wireless circuitry  936  is configured to implement Institute of Electrical and Electronic Engineers (IEEE) 802.11 communication standards, also referred to herein as Wi-Fi. In other examples, other high-speed communications standards may be implemented by high-speed wireless circuitry  936 . 
     The low-power circuitry  920  includes a low-power processor  922  and low-power wireless circuitry  924 . The low-power wireless circuitry  924  and the high-speed wireless circuitry  936  of the eyewear device  100  can include short range transceivers (Bluetooth™) and wireless wide, local, or wide-area network transceivers (e.g., cellular or WiFi). Mobile device  890 , including the transceivers communicating via the low-power wireless connection  925  and the high-speed wireless connection  937 , may be implemented using details of the architecture of the eyewear device  100 , as can other elements of the network  995 . 
     Memory  934  includes any storage device capable of storing various data and applications, including, among other things, camera data generated by the left and right visible-light cameras  114 A,  114 B, the infrared camera(s)  220 , the image processor  912 , and images generated for display by the image display driver  942  on the image display of each optical assembly  180 A,  180 B. Although the memory  934  is shown as integrated with high-speed circuitry  930 , the memory  934  in other examples may be an independent, standalone element of the eyewear device  100 . In certain such examples, electrical routing lines may provide a connection through a chip that includes the high-speed processor  932  from the image processor  912  or low-power processor  922  to the memory  934 . In other examples, the high-speed processor  932  may manage addressing of memory  934  such that the low-power processor  922  will boot the high-speed processor  932  any time that a read or write operation involving memory  934  is needed. 
     As shown in  FIG.  4   , the high-speed processor  932  of the eyewear device  100  can be coupled to the camera system (visible-light cameras  114 A,  114 B), the image display driver  942 , the user input device  991 , and the memory  934 . As shown in  FIG.  5   , the CPU  830  of the mobile device  890  may be coupled to a camera system  870 , a mobile display driver  882 , a user input layer  891 , and a memory  840 A. The eyewear device  100  can perform all or a subset of any of the functions described herein which result from the execution of the message composition and sharing system  1000  in the memory  934  by the processor  932  of the eyewear device  100 . The mobile device  890  can perform all or a subset of any of the functions described herein which result from the execution of the message composition and sharing system  1000  in the flash memory  840 A by the CPU  830  of the mobile device  890 . Functions can be divided in the message composition and sharing system  1000  such that the ring  500  collects raw data from the IMU  572  and sends it to the eyewear device  100  which performs the displaying, comparing, and composing functions. 
     The server system  998  may be one or more computing devices as part of a service or network computing system, for example, that include a processor, a memory, and network communication interface to communicate over the network  995  with an eyewear device  100  and a mobile device  890 . 
     The output components of the eyewear device  100  include visual elements, such as the left and right image displays associated with each lens or optical assembly  180 A,  180 B as described in  FIGS.  2 A and  2 B  (e.g., a display such as a liquid crystal display (LCD), a plasma display panel (PDP), a light emitting diode (LED) display, a projector, or a waveguide). The eyewear device  100  may include a user-facing indicator (e.g., an LED, a loudspeaker, or a vibrating actuator), or an outward-facing signal (e.g., an LED, a loudspeaker). The image displays of each optical assembly  180 A,  180 B are driven by the image display driver  942 . In some example configurations, the output components of the eyewear device  100  further include additional indicators such as audible elements (e.g., loudspeakers), tactile components (e.g., an actuator such as a vibratory motor to generate haptic feedback), and other signal generators. For example, the device  100  may include a user-facing set of indicators, and an outward-facing set of signals. The user-facing set of indicators are configured to be seen or otherwise sensed by the user of the device  100 . For example, the device  100  may include an LED display positioned so the user can see it, a loudspeaker positioned to generate a sound the user can hear, or an actuator to provide haptic feedback the user can feel. The outward-facing set of signals are configured to be seen or otherwise sensed by an observer near the device  100 . Similarly, the device  100  may include an LED, a loudspeaker, or an actuator that is configured and positioned to be sensed by an observer. 
     The input components of the eyewear device  100  may include alphanumeric input components (e.g., a touch screen or touchpad configured to receive alphanumeric input, a photo-optical keyboard, or other alphanumeric-configured elements), pointer-based input components (e.g., a mouse, a touchpad, a trackball, a joystick, a motion sensor, or other pointing instruments), tactile input components (e.g., a button switch, a touch screen or touchpad that senses the location, force, of both of touches or touch gestures, or other tactile-configured elements), and audio input components (e.g., a microphone), and the like. The mobile device  890  and the server system  998  may include alphanumeric, pointer-based, tactile, audio, and other input components. 
     In some examples, the eyewear device  100  includes a collection of motion-sensing components referred to as an inertial measurement unit  972 . The motion-sensing components may be micro-electro-mechanical systems (MEMS) with microscopic moving parts, often small enough to be part of a microchip. The inertial measurement unit (IMU)  972  in some example configurations includes an accelerometer, a gyroscope, and a magnetometer. The accelerometer senses the linear acceleration of the device  100  (including the acceleration due to gravity) relative to three orthogonal axes (x, y, z). The gyroscope senses the angular velocity of the device  100  about three axes of rotation (pitch, roll, yaw). Together, the accelerometer and gyroscope can provide position, orientation, and motion data about the device relative to six axes (x, y, z, pitch, roll, yaw). The magnetometer, if present, senses the heading of the device  100  relative to magnetic north. The position of the device  100  may be determined by location sensors, such as a GPS receiver, one or more transceivers to generate relative position coordinates, altitude sensors or barometers, and other orientation sensors. Such positioning system coordinates can also be received over the wireless connections  925 ,  937  from the mobile device  890  via the low-power wireless circuitry  924  or the high-speed wireless circuitry  936 . 
     The IMU  972  may include or cooperate with a digital motion processor or programming that gathers the raw data from the components and compute a number of useful values about the position, orientation, and motion of the device  100 . For example, the acceleration data gathered from the accelerometer can be integrated to obtain the velocity relative to each axis (x, y, z); and integrated again to obtain the position of the device  100  (in linear coordinates, x, y, and z). The angular velocity data from the gyroscope can be integrated to obtain the position of the device  100  (in spherical coordinates). The programming for computing these useful values may be stored in memory  934  and executed by the high-speed processor  932  of the eyewear device  100 . 
     The eyewear device  100  may optionally include additional peripheral sensors, such as biometric sensors, specialty sensors, or display elements integrated with eyewear device  100 . For example, peripheral device elements may include any I/O components including output components, motion components, position components, or any other such elements described herein. For example, the biometric sensors may include components to detect expressions (e.g., hand expressions, facial expressions, vocal expressions, body gestures, or eye tracking), to measure biosignals (e.g., blood pressure, heart rate, body temperature, perspiration, or brain waves), or to identify a person (e.g., identification based on voice, retina, facial characteristics, fingerprints, or electrical biosignals such as electroencephalogram data), and the like. 
     The message composition and sharing system  1000 , as shown in  FIG.  4   , includes a computing device, such as mobile device  890 , coupled to an eyewear device  100  and to a handheld device or ring  500  over a network. The eyewear device  100 , as described herein, includes an inertial measurement unit  972  for collecting data about the position, orientation, and motion of the eyewear device  100 . 
     The message composition and sharing system  1000  further includes a memory for storing instructions (including those in a message composition system) and a processor for executing the instructions. Execution of the instructions of the message composition system by the processor  932  configures the eyewear device  100  to cooperate with the ring  500  and compose a message. The system  1000  may utilize the memory  934  of the eyewear device  100  or the memory elements  840 A,  840 B of the mobile device  890  ( FIG.  5   ) or the memory  540  of the ring  500  ( FIG.  6   ). Also, the system  1000  may utilize the processor elements  932 ,  922  of the eyewear device  100  or the central processing unit (CPU)  830  of the mobile device  890  ( FIG.  5   ) or the microcontroller  530  of the ring  500  ( FIG.  6   ). Furthermore, the system  1000  may further utilize the memory and processor elements of the server system  998 . In this aspect, the memory and processing functions of the message composition and sharing system  1000  can be shared or distributed across the eyewear device  100 , the mobile device  890 , the ring  500 , or the server system  998 . 
     The mobile device  890  may be a smartphone, tablet, laptop computer, access point, or any other such device capable of connecting with eyewear device  100  using both a low-power wireless connection  925  and a high-speed wireless connection  937 . Mobile device  890  is connected to server system  998  and network  995 . The network  995  may include any combination of wired and wireless connections. 
       FIG.  5    is a high-level functional block diagram of an example mobile device  890 . Mobile device  890  includes a flash memory  840 A which includes programming to perform all or a subset of the functions described herein. Mobile device  890  may include a camera  870  that comprises at least two visible-light cameras (first and second visible-light cameras with overlapping fields of view) or at least one visible-light camera and a depth sensor with substantially overlapping fields of view and an IMU  872 . Flash memory  840 A may further include multiple images or video, which are generated via the camera  870 . 
     As shown, the mobile device  890  includes an image display  880 , a mobile display driver  882  to control the image display  880 , and a controller  884 . In the example of  FIG.  4   , the image display  880  includes a user input layer  891  (e.g., a touchscreen) that is layered on top of or otherwise integrated into the screen used by the image display  880 . 
     Examples of touchscreen-type mobile devices that may be used include (but are not limited to) a smart phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or other portable device. However, the structure and operation of the touchscreen-type devices is provided by way of example; the subject technology as described herein is not intended to be limited thereto. For purposes of this discussion,  FIG.  4    therefore provides a block diagram illustration of the example mobile device  890  with a user interface that includes a touchscreen input layer  891  for receiving input (by touch, multi-touch, or gesture, and the like, by hand, stylus or other tool) and an image display  880  for displaying content 
     As shown in  FIG.  4   , the mobile device  890  includes at least one digital transceiver (XCVR)  810 , shown as WWAN XCVRs, for digital wireless communications via a wide-area wireless mobile communication network. The mobile device  890  also includes additional digital or analog transceivers, such as short range XCVRs  820  for short-range network communication, such as via NFC, VLC, DECT, ZigBee, Bluetooth™, or WiFi. For example, short range XCVRs  820  may take the form of any available two-way wireless local area network (WLAN) transceiver of a type that is compatible with one or more standard protocols of communication implemented in wireless local area networks, such as one of the Wi-Fi standards under IEEE 802.11. 
     To generate location coordinates for positioning of the mobile device  890 , the mobile device  890  can include a global positioning system (GPS) receiver. Alternatively, or additionally the mobile device  890  can utilize either or both the short range XCVRs  820  and WWAN XCVRs  810  for generating location coordinates for positioning. For example, cellular network, Wi-Fi, or Bluetooth™ based positioning systems can generate very accurate location coordinates, particularly when used in combination. Such location coordinates can be transmitted to the eyewear device over one or more network connections via XCVRs  810 ,  820 . 
     The transceivers  810 ,  820  (i.e., the network communication interface) conforms to one or more of the various digital wireless communication standards utilized by modern mobile networks. Examples of WWAN transceivers  810  include (but are not limited to) transceivers configured to operate in accordance with Code Division Multiple Access (CDMA) and 3rd Generation Partnership Project (3GPP) network technologies including, for example and without limitation, 3GPP type 2 (or 3GPP2) and LTE, at times referred to as “4G.” For example, the transceivers  810 ,  820  provide two-way wireless communication of information including digitized audio signals, still image and video signals, web page information for display as well as web-related inputs, and various types of mobile message communications to/from the mobile device  890 . 
     The mobile device  890  further includes a microprocessor that functions as a central processing unit (CPU); shown as CPU  830  in  FIG.  4   . A processor is a circuit having elements structured and arranged to perform one or more processing functions, typically various data processing functions. Although discrete logic components could be used, the examples utilize components forming a programmable CPU. A microprocessor for example includes one or more integrated circuit (IC) chips incorporating the electronic elements to perform the functions of the CPU. The CPU  830 , for example, may be based on any known or available microprocessor architecture, such as a Reduced Instruction Set Computing (RISC) using an ARM architecture, as commonly used today in mobile devices and other portable electronic devices. Of course, other arrangements of processor circuitry may be used to form the CPU  830  or processor hardware in smartphone, laptop computer, and tablet. 
     The CPU  830  serves as a programmable host controller for the mobile device  890  by configuring the mobile device  890  to perform various operations, for example, in accordance with instructions or programming executable by CPU  830 . For example, such operations may include various general operations of the mobile device, as well as operations related to the programming for applications on the mobile device. Although a processor may be configured by use of hardwired logic, typical processors in mobile devices are general processing circuits configured by execution of programming. 
     The mobile device  890  includes a memory or storage system, for storing programming and data. In the example, the memory system may include a flash memory  840 A, a random-access memory (RAM)  840 B, and other memory components, as needed. The RAM  840 B serves as short-term storage for instructions and data being handled by the CPU  830 , e.g., as a working data processing memory. The flash memory  840 A typically provides longer-term storage. 
     Hence, in the example of mobile device  890 , the flash memory  840 A is used to store programming or instructions for execution by the CPU  830 . Depending on the type of device, the mobile device  890  stores and runs a mobile operating system through which specific applications are executed. Examples of mobile operating systems include Google Android, Apple iOS (for iPhone or iPad devices), Windows Mobile, Amazon Fire OS, RIM BlackBerry OS, or the like. 
       FIG.  6    is a high-level functional block diagram of an example handheld device, such as a ring  500 . The ring  500 , as shown, includes an input device  591  (e.g., a touchpad), a lamp  550  (e.g., a light-emitting diode), a touch driver  582 , a touch controller  584 , a short-range transceiver  520 , a microcontroller  530 , a memory  540 , an inertial measurement unit (IMU)  572 , a battery  505 , and one or more charging and communications pins  510 . 
     The ring  500  includes at least one short-range transceiver  520  that is configured for short-range network communication, such as via NFC, VLC, DECT, ZigBee, Bluetooth™, BLE (Bluetooth Low-Energy), or WiFi. The short-range transceiver(s)  520  may take the form of any available two-way wireless local area network (WLAN) transceiver of a type that is compatible with one or more standard protocols of communication implemented in wireless local area networks, such as one of the Wi-Fi standards under IEEE 802.11. 
     The ring  500  may also include a global positioning system (GPS) receiver. Alternatively, or additionally, the ring  500  can utilize either or both the short-range transceiver(s)  520  for generating location coordinates for positioning. For example, cellular network, WiFi, or Bluetooth™ based positioning systems can generate very accurate location coordinates, particularly when used in combination. Such location coordinates can be transmitted to one or more eyewear devices  100 , or to one or more mobile devices  890 , over one or more network connections via the transceiver(s)  520 . 
     The transceivers  520  (i.e., the network communication interface) conforms to one or more of the various digital wireless communication standards utilized by modern mobile networks. Examples of WWAN transceivers include but are not limited to transceivers configured to operate in accordance with Code Division Multiple Access (CDMA) and 3rd Generation Partnership Project (3GPP) network technologies including, for example and without limitation, 3GPP type 2 (or 3GPP2) and LTE, at times referred to as “4G.” For example, the transceivers  520  provide two-way wireless communication of information including digitized audio signals, still image and video signals, web page information for display as well as web-related inputs, and various types of mobile message communications to or from the ring  500 . 
     The ring  500  further includes a microcontroller  530  that functions as a central processing unit (CPU) for the ring  500 , as shown in  FIG.  6   . A processor is a circuit having elements structured and arranged to perform one or more processing functions, typically various data processing functions. Although discrete logic components could be used, the examples utilize components forming a programmable CPU. A microprocessor for example includes one or more integrated circuit (IC) chips incorporating the electronic elements to perform the functions of the microprocessor. The microcontroller  530 , for example, may be based on any known or available microprocessor architecture, such as a Reduced Instruction Set Computing (RISC) using an ARM architecture, as commonly used today in mobile devices and other portable electronic devices. Of course, other arrangements of processor circuitry may be used to form the microcontroller  530  or processor hardware in smartphone, laptop computer, and tablet. 
     The microcontroller  530  serves as a programmable host controller for the message composition and sharing system  1000  by configuring the ring  500  to perform various operations; for example, in accordance with instructions or programming executable by the microcontroller  530 . For example, such operations may include various general operations of the ring  500 , as well as operations related to the programming for applications that reside on the ring  500 . Although a processor may be configured by use of hardwired logic, typical processors in mobile devices are general processing circuits configured by execution of programming. 
     The ring  500  includes one or more memory elements  540  for storing programming and data. The memory  540  may include a flash memory, a random-access memory (RAM), or other memory elements, as needed. The memory  540  stores the programming and instructions needed to perform all or a subset of the functions described herein. The RAM, if present, may operate as short-term storage for instructions and data being handled by the microcontroller  530 . Depending on the particular type of handheld device, the ring  500  stores and runs an operating system through which specific applications are executed. The operating system may be a mobile operating system, such as Google Android, Apple iOS, Windows Mobile, Amazon Fire OS, RIM BlackBerry OS, or the like. 
     In some examples, the ring  500  includes a collection of motion-sensing components referred to as an inertial measurement unit  572 . The motion-sensing components may be micro-electro-mechanical systems (MEMS) with microscopic moving parts, often small enough to be part of a microchip. The inertial measurement unit (IMU)  572  in some example configurations includes an accelerometer, a gyroscope, and a magnetometer. The accelerometer senses the linear acceleration of the ring  500  (including the acceleration due to gravity) relative to three orthogonal axes (x, y, z). The gyroscope senses the angular velocity of the ring  500  about three axes of rotation (pitch, roll, yaw). Together, the accelerometer and gyroscope can provide position, orientation, and motion data about the device relative to six axes (x, y, z, pitch, roll, yaw). The magnetometer, if present, senses the heading of the ring  500  relative to magnetic north. The position of the ring  500  may be determined by location sensors, such as a GPS receiver, one or more transceivers to generate relative position coordinates, altitude sensors or barometers, and other orientation sensors. Such positioning system coordinates can also be received over the wireless connections  925 ,  937  from the mobile device  890  via the low-power wireless circuitry  924  or the high-speed wireless circuitry  936 . 
     The IMU  572  may include or cooperate with a digital motion processor or programming that gathers the raw data from the components and compute a number of useful values about the position, orientation, and motion of the ring  500 . For example, the acceleration data gathered from the accelerometer can be integrated to obtain the velocity relative to each axis (x, y, z); and integrated again to obtain the position of the ring  500  (in linear coordinates, x, y, and z). The angular velocity data from the gyroscope can be integrated to obtain the position of the ring  500  (in spherical coordinates). The programming for computing these useful values may be stored in memory  934  and executed by the high-speed processor  932  of the eyewear device  100 . 
     The ring  500  may optionally include additional peripheral sensors, such as biometric sensors, specialty sensors, or display elements integrated with the ring  500 . For example, peripheral device elements may include any I/O components including output components, motion components, position components, or any other such elements described herein. For example, the biometric sensors may include components to detect expressions (e.g., hand expressions, facial expressions, vocal expressions, body gestures, or eye tracking), to measure biosignals (e.g., blood pressure, heart rate, body temperature, perspiration, or brain waves), or to identify a person (e.g., identification based on voice, retina, facial characteristics, fingerprints, or electrical biosignals such as electroencephalogram data), and the like. 
       FIG.  7    is a schematic view of an example hardware configuration for a ring  500 . The touchpad  591 , a shown, may be sized and shaped to conform closely to an outer surface of the ring  500 . The ring  500  may also include an LED  550 . The battery  505  may be sized and shaped to fit within the body of the ring  500 , with connections to one or more charging and communications pins  510 . As shown, the ring  500  may include an internal space (beneath the pins  510  in this example) to house a variety of components, such as a touch driver  582 , a touch controller  584 , a short-range transceiver  520 , a microcontroller  530 , a memory  540 , and an inertial measurement unit (IMU)  572 . 
       FIG.  8    is an illustration of a ring  500  on the index finger of a hand  10 . The thumb is touching the touchpad  591 . In use, the hand  10  moves the ring  500  along a course  610  from a start location  622 , by and past one or more intermediate locations  625 , to a stop location  629 . When the ring  500  is in motion along the course  610 , the IMU  572  is collecting course data. The course data includes information about the location, orientation, motion, heading, or a combination thereof of the ring  500  at each of a plurality of locations along the course  610 . 
     The display  650  illustrated in  FIG.  8   , in some implementations, includes a keyboard  660 , a cursor  661 , a candidate words area  680 , and a message composition area  690  where a message  700  in progress may be shown. The display  650  also includes a trace  665  that is presented in an overlay relative to the keyboard  660 . As shown, the trace  665  has nearly the same path and shape as the course  610  traveled by the ring  500 . When the ring  500  is in motion along the course  610 , the course data collected by the IMU  572  is used to display the trace  665 , so that the trace  665  is correlated with the course  610  in near real-time. In this aspect, the motion of the ring  500  by the hand along a course  610  is nearly immediately translated into a correlated motion of the trace  665  from key to key on the keyboard  660 . 
     The display  650  in some implementations, is projected onto a surface, such as a head-mounted screen or an optical element  180 A,  180 B of an eyewear device  100  as described herein. The eyewear device  100  may include a projector  150  ( FIG.  2 B ) that is positioned and configured to project the keyboard  660 , the cursor  661 , and the trace  661  onto at least one optical element (e.g., right lens  180 B). In this implementation, the ring  500  cooperates with the eyewear device  100  to compose a message. 
     The message composition and sharing system  1000 , as shown in  FIG.  4   , in some implementations, includes a handheld device (ring  500 ) and a portable device (eyewear  100 ). The ring  500  includes a microcontroller  530 , an input device (touchpad  591 ), and an inertial measurement unit  572 . The eyewear  100 , which is in communication with the ring  500 , includes a processor  932 , a memory  934 , and a display (e.g., the image display associated with at least one lens or optical assembly  180 A,  180 B). 
     In an example method of using the message composition and sharing system  1000 , a user may begin by sending a start input to the ring  500 ; for example, by tapping the touchpad  591  with a thumb or finger. The start input may include any of a variety of tap patterns, which may be set or established through a user interface associated with the ring  500 . 
     In response to detecting a start input, the system  1000  may present a keyboard  660  and a cursor  661  on a display  650 . The cursor  661  may appear at a default location relative to the keyboard  660 . At this time, the cursor  661  may move in correlation with any motion of the ring  500  by the hand  10 . In this aspect, the IMU  572  may be collecting position data before the start of a course  610  for a particular word. 
     The IMU  572  inside the ring  500 , in accordance with programming instructions stored in the memory  540 , performs the step of collecting course data associated with a course  610  traveled by the hand  10  in motion. The course data is associated with a first word, as well as subsequent words, in a message. 
     The eyewear device  100  in some implementations, receives the course data from the ring  500  in near real time and in accordance with programming instructions stored in the memory  934 , performs the step of overlaying a trace  665  onto the display  650  in a semitransparent layer superimposed on top of the keyboard  660 . The path of the trace  665  is based on the course data being received in near real time from the ring  500 . 
     As the course  610  proceeds, and as the trace  665  passes near one or more letter keys on the keyboard  660 , the eyewear device  100  performs the step of identifying one or more candidate words from a set of words stored in the memory  934 . The set of words includes, for each word in the set, a usage frequency and path data relative to the key locations (letters) on a keyboard. For example, as illustrated in  FIG.  8   , the example trace  665  passes near the letter keys for H, then E, then Y. The candidate words THEY and HE and HELLO are displayed in a candidate words area  680 . 
     During this step in the process, the eyewear device  100  performs the step of comparing the course data for the first word to the path data associated with one or more of the candidate words to generate a ranked list of candidate words. The ranked list may be displayed in rank order (e.g., first THEY, then HE, and third HELLO) in a candidate words area  680 . 
     When the highest-ranked word is identified, the eyewear device  100  performs the step of presenting the highest-ranked word as text on the display; in some implementations, in a message composition area  690 . In the example shown in  FIG.  8   , the highest-ranked word is HEY, which represents the first output word generated by the system  1000  in a message  700  in progress. 
     Starting and stopping a course  610  associated with a word, in some implementations, includes one or more particular inputs by the thumb or finger that is touching the touchpad  591 . 
     To move into position for starting a new word, the user (while viewing the cursor  661  on the display  650 ) moves her hand  10  until the cursor  661  relative to the displayed keyboard  660  is near a first key location associated with the first letter of the new word. This motion places the ring  500  near the start location  622  for the course  610  to be traveled by the hand  10  for the new word. 
     To start a course  610  for a new word, the user in some implementations will press and hold thumb or finger on the touchpad  591  and, thus, engage the IMU  572  to begin and continue the process of collecting the course data for a word while moving the hand  10  along the course  610 . The course data includes information from the IMU  572  about the location, orientation, motion, heading, or a combination thereof of the ring  500  at each of a plurality of locations along the course  610 . 
     To stop a course  610  for a new word, the user in some implementations will release the thumb or finger from the touchpad  591  and, thus, stop the IMU  572  from collecting further course data for the word. The act of releasing occurs when the trace  661  relative to the displayed keyboard  660  is near a last key location associated with a last letter of the word. 
     As described herein, the trace  665  moves in near real-time and follows the path of the course  610  traveled by the hand  10  in motion. The trace  665  in some implementations has a leading end and a trailing end. The cursor  661  may be persistently displayed near the leading end of the trace  665 . For lengthy words, the trace  665  may obscure all or part of the keyboard  660 . The trace  665  may have an active length that is shorter than the distance between the first letter key and the last letter key in a word. To clear part of the trace  665 , the system may fade or slowly dissipate a portion the trailing end of the trace  665 , leaving only the active length visible on the display. 
     The message composition and sharing system  1000  may be used, of course, to compose a message  700  that includes a number of words and characters. When the process is completed for a first word, the system  1000  is configured to repeat the process for a subsequent word. In some implementations, the eyewear device  100  in accordance with programming instructions stored in the memory  934  performs the steps of fading the first trace from the display; displaying a subsequent trace based on subsequent course data for a subsequent word; comparing the subsequent course data to the path data associated with the candidate words to generate a subsequent ranked list; presenting as text a subsequent highest-ranked word according to the subsequent ranked list, where the subsequent highest-ranked word represents a subsequent output word in the message. The system  1000  may receive a recipient identifier and then send the message to the recipient. 
     The IMU  572  inside the ring  500  is collecting course data when the ring  500  is in motion along the course  610 . The course data includes information about the location, orientation, motion, heading, or a combination thereof of the ring  500  at each of a plurality of locations along the course  610 . In some implementations, the ring  500  in accordance with programming instructions stored in the memory  540  performs the step of placing (mathematically) an origin of three orthogonal axes near the start location  622  of the course  610  for a first word. In this aspect, the ring  500  establishes an origin (with zero coordinates: 0, 0, 0) at the start location  622 . The accelerometer element of the IMU  572  collects a first linear acceleration of the ring  500  and the gyroscope element of the IMU  572  senses the angular velocity of the ring  500  at each of the plurality of locations along the course  610 . The ring  500  (or the eyewear device  100 ) in accordance with programming instructions, then performs the step of computing a first position (in three coordinates: x, y, z), based on the course data, for each of the plurality of locations along the course  610 . 
     In some implementations, the ring  500  performs the step of computing the first position of the ring  500  for each of the plurality of locations along the course  610  based on both the accelerometer data and the gyroscope data from the IMU  572 . Together, the accelerometer and gyroscope can provide position, orientation, and motion data about the device relative to six axes or degrees of freedom (x, y, z, pitch, roll, yaw). The ring  500  computes the course  610  based on the combination, blending, or fusion of the accelerometer data and the gyroscope data. In this aspect, both the accelerometer data and the gyroscope data are useful in computing the course  610  of the ring  500  which, in turn, influences the display of the trace  661  on the display  650 . 
     The systems and methods described herein may be used for composing a message  700  for sending to others, such as a text message, and also for any other text-related task. For example, the course  610 , the display  650 , and the trace  665  may be used to enter a username or password, to name a file when saving, to add a hashtag to a photo or other file, to select from a list, and to enter search terms, and the like. 
     Any of the message composition and sharing functionality described herein for the eyewear device  100 , the ring  500 , the mobile device  890 , and the server system  998  can be embodied in one more computer software applications or sets of programming instructions, as described herein. According to some examples, “function,” “functions,” “application,” “applications,” “instruction,” “instructions,” or “programming” are program(s) that execute functions defined in the programs. Various programming languages can be employed to create one or more of the applications, structured in a variety of manners, such as object-oriented programming languages (e.g., Objective-C, Java, or C++) or procedural programming languages (e.g., C or assembly language). In a specific example, a third-party application (e.g., an application developed using the ANDROID™ or IOS™ software development kit (SDK) by an entity other than the vendor of the particular platform) may include mobile software running on a mobile operating system such as IOS™, ANDROID™, WINDOWS® Phone, or another mobile operating systems. In this example, the third-party application can invoke API calls provided by the operating system to facilitate functionality described herein. 
     Hence, a machine-readable medium may take many forms of tangible storage medium. Non-volatile storage media include, for example, optical or magnetic disks, such as any of the storage devices in any computer devices or the like, such as may be used to implement the client device, media gateway, transcoder, etc. shown in the drawings. Volatile storage media include dynamic memory, such as main memory of such a computer platform. Tangible transmission media include coaxial cables; copper wire and fiber optics, including the wires that comprise a bus within a computer system. Carrier-wave transmission media may take the form of electric or electromagnetic signals, or acoustic or light waves such as those generated during radio frequency (RF) and infrared (IR) data communications. Common forms of computer-readable media therefore include for example: a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD or DVD-ROM, any other optical medium, punch cards paper tape, any other physical storage medium with patterns of holes, a RAM, a PROM and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave transporting data or instructions, cables or links transporting such a carrier wave, or any other medium from which a computer may read programming code or data. Many of these forms of computer readable media may be involved in carrying one or more sequences of one or more instructions to a processor for execution. 
     Except as stated immediately above, nothing that has been stated or illustrated is intended or should be interpreted to cause a dedication of any component, step, feature, object, benefit, advantage, or equivalent to the public, regardless of whether it is or is not recited in the claims. 
     It will be understood that the terms and expressions used herein have the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein. Relational terms such as first and second and the like may be used solely to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” “includes,” “including,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises or includes a list of elements or steps does not include only those elements or steps but may include other elements or steps not expressly listed or inherent to such process, method, article, or apparatus. An element preceded by “a” or “an” does not, without further constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. 
     Unless otherwise stated, any and all measurements, values, ratings, positions, magnitudes, sizes, and other specifications that are set forth in this specification, including in the claims that follow, are approximate, not exact. Such amounts are intended to have a reasonable range that is consistent with the functions to which they relate and with what is customary in the art to which they pertain. For example, unless expressly stated otherwise, a parameter value or the like may vary by as much as ± 10% from the stated amount. 
     In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in various examples for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed examples require more features than are expressly recited in each claim. Rather, as the following claims reflect, the subject matter to be protected lies in less than all features of any single disclosed example. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separately claimed subject matter. 
     While the foregoing has described what are considered to be the best mode and other examples, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that they may be applied in numerous applications, only some of which have been described herein. It is intended by the following claims to claim any and all modifications and variations that fall within the true scope of the present concepts.