Patent Publication Number: US-11663793-B2

Title: Geospatial image surfacing and selection

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of U.S. application Ser. No. 16/821,188 filed on Mar. 17, 2020, which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present subject matter relates to mobile devices, e.g., eyewear devices, and, more particularly, to visually presenting images based on the physical location of the mobile devices. 
     BACKGROUND 
     Mobile devices, including cellular telephones and eyewear devices, such as smart glasses, headwear, and headgear, integrate image displays and cameras. Such devices can capture and present images. Many mobile devices also integrate sensors capable of determining the physical location of the mobile devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawing figures depict one or more implementations, by way of example only, not by way of limitations. In the figures, like reference numerals refer to the same or similar elements. 
         FIG.  1 A  is a side view of an example hardware configuration of an eyewear device, which includes a visible light camera on a corner and a speaker on a temple. 
         FIGS.  1 B and  1 C  are rear views of example hardware configurations of the eyewear device of  FIG.  1 A , including two different types of image displays. 
         FIGS.  2 A and  2 B  are rear views of example hardware configurations of the eyewear device of  FIG.  1 A , including eye movement tracking hardware. 
         FIG.  2 C  is an illustration depicting a technique for tracking eye movement. 
         FIG.  2 D  is a top cross-sectional view of a corner of the eyewear device of  FIG.  1 A  depicting the visible light camera, a head movement tracker, and a circuit board. 
         FIG.  3    is a high-level functional block diagram of an example image selection and display system including the eyewear device, a mobile device, and a server system connected via various networks. 
         FIG.  4    shows an example of a hardware configuration for the mobile device in simplified block diagram form. 
         FIGS.  5 A and  5 B  are flowcharts of example steps for capturing and distributing images for use in the image selection and display system of  FIG.  3   . 
         FIGS.  5 C,  5 D,  5 E, and  5 F  are flowcharts of example steps for presenting image overlays for use in the image selection and display system of  FIG.  3   . 
         FIG.  6 A  is a perspective view of a scene viewed through a see-though optical assembly of an eyewear device with selectable images corresponding to where they were captured in relation to the physical location of the user. 
         FIG.  6 B  is a perspective view of a scene viewed through the see-though optical assembly of  FIG.  6 A  with a selected image presented by the see-through optical assembly. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description includes examples for viewing audio and visual content captured by others on a user&#39;s mobile device (e.g., a mobile eyewear device) based on where they were captured in relation to the location of the user&#39;s mobile device. This enables a user of a mobile device to see activity and detail in their vicinity—mimicking the functionality of high-powered binoculars and enabling the user to see content obstructed from the user&#39;s view from their current location (such as a performer on a stage inside a restaurant when the user is outside). In one example, content captured by others (or previously by the user) is tagged with location coordinates (e.g., GPS coordinates) and stored on a server. A mobile device of the user provides its current location to the server, which retrieves content corresponding to that location and sends it to the mobile device. The mobile device overlays icons associated with the content on a scene being viewed with the mobile device for selection by the user. Upon selection of an icon by the user, the device displays the associated content. 
     In the following detailed description, numerous specific details are set forth by way of examples in order to provide a thorough understanding of the relevant teachings. However, it should be apparent to those skilled in the art that the present teachings may be practiced without such details. In other instances, description of well-known methods, procedures, components, and circuitry are set forth at a relatively high-level, without detail, in order to avoid unnecessarily obscuring aspects of the present teachings. 
     The term “coupled” as used herein refers to any logical, optical, physical or electrical connection, link or the like by which electrical signals produced or supplied by one system element are imparted to another coupled element. Unless described otherwise, coupled elements or devices are not necessarily directly connected to one another and may be separated by intermediate components, elements or communication media that 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. As used herein, the term “about” means ±10% from the stated amount. 
     The orientations of the mobile devices, eyewear devices, associated components and any complete devices incorporating a camera such as shown in any of the drawings, are given by way of example only, for illustration and discussion purposes. In operation, for particular programming, devices may be oriented in any other direction suitable to the particular application, 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 and side, are used by way of example only, and are not limiting as to direction or orientation of any camera or component of a camera constructed as otherwise described herein. 
     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 examples illustrated in the accompanying drawings and discussed below. 
       FIG.  1 A  depicts an example hardware configuration of a mobile device in the form of an eyewear device  100  for capturing and displaying content (e.g., visual content such as images and video, and audio content). The mobile device may take other forms such as a mobile phone or a tablet. Additionally, the eyewear device  100  can take other forms and may incorporate other types of frameworks, for example, a headgear, a headset, or a helmet. The eyewear device  100  includes at least one visible light camera  114  on a corner  110 B for capturing images in a viewing area (e.g., field of view). The illustrated eyewear device  100  also includes a speaker  115  and a microphone  116 . 
     The visible light camera  114  is sensitive to the visible light range wavelength. As shown in the example, the visible light camera  114  has a front facing field of view from the perspective of a wearer that is configured to capture images of a scene being viewed thought an optical assembly  180 B. Examples of such a visible light camera  114  include a high-resolution complementary metal-oxide-semiconductor (CMOS) image sensor and a video graphic array (VGA) camera, such as 640p (e.g., 640×480 pixels for a total of 0.3 megapixels), 720p, or 1080p. The eyewear device  100  captures image sensor data from the visible light camera  114 , and optionally other data such as geolocation data and audio data (via microphone  116 ), digitizes the data using one or more processors, and stores the digitized data in a memory. The term “field of view” is intended to describe the viewing area which the user of a mobile device can see with his or her eyes through optical assemblies  180  or on a display of a mobile device presenting information captured with the visible light camera  114 . 
     Visible light camera  114  may be coupled to an image processor (element  312  of  FIG.  3   ) for digital processing and adding of timestamp and location coordinates corresponding to when and where an image of a scene is captured. Image processor  312  includes circuitry to receive signals from the visible light camera  114  and process those signals from the visible light camera  114  into a format suitable for storage in memory (element  334  of  FIG.  3   ). The timestamp can be added by the image processor  312  or other processor, which controls operation of the visible light camera  114 . The image processor  312  may additionally add the location coordinates, e.g., received from a global positioning system (element  331  of  FIG.  3   ). 
     The microphone  116  may be coupled to an audio processor (element  313  of  FIG.  3   ) for digital processing and adding a timestamp indicating when audio is captured. The audio processor  313  includes circuitry to receive signals from the microphone  116  (or from memory) and process those signals into a format suitable for storage in the memory  334  and/or presentation by speaker  115 . The timestamp can be added by the audio processor  313  or other processor, which controls operation of the speaker  115  and the microphone  116 . 
     As shown in  FIGS.  1 A,  1 B, and  1 C , the eyewear device  100  includes a frame  105  having a left rim  107 A connected to a right rim  107 B via a bridge  106  adapted for a nose of the user. The left and right rims  107 A-B include respective apertures  175 A-B that hold a respective optical assembly  180 A-B. Left and right temples  125 A-B extend from respective lateral sides  170 A-B of the frame  105 , for example, via respective left and right corners  110 A-B. Each temple  125 A-B is connected to the frame  105  via a respective hinge  126 A-B. A substrate or materials forming the frame  105 , corners  110 , and temples  125 A-B can include plastic, acetate, metal, or a combination thereof. The corners  110 A-B can be integrated into or connected to the frame  105  and/or temples  125 A-B. 
     Although shown as having two optical assemblies  180 A-B, the eyewear device  100  can include other arrangements, such as a single or three optical assemblies, or the optical assembly  180 A-B may have a different arrangement depending on the application or intended user of the eyewear device  100 . 
     In one example, such as depicted in  FIG.  1 B , each optical assembly  180 A-B includes a display matrix  171  and an optical layer or layers  176 A-N. The display matrix  171  may include a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, or other such display. The optical layer or layers  176  may include lenses, optical coatings, prisms, mirrors, waveguides, optical strips, and other optical components in any combination. As used herein, the term lens is meant to cover transparent or translucent pieces of glass or plastic having curved and/or flat surfaces that cause light to converge/diverge or that cause little or no convergence or divergence. 
     The optical layers  176 A-N can include a prism having a suitable size and configuration and including a first surface for receiving light from 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-B formed in the left and right rims  107 A-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-B. The first surface of the prism of the optical layers  176 A-N faces upwardly from the frame  105  and the display matrix overlies the prism so that photons and light emitted by the display matrix 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  171 , and the light that 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  171 . 
     In another example, such as depicted in  FIG.  1 C , the image display device of optical assembly  180 A-B includes a projection image display. The illustrated projection image display includes a laser projector  150  (e.g., a three-color laser projector using a scanning mirror or galvanometer) disposed adjacent one of the corners  110 A-B of the eyewear device  100  and optical strips  155 A-N spaced apart across the width of the lens of the optical assembly  180 A-B or across a depth of the lens between the front surface and the rear surface of the lens. 
     As the photons projected by the laser projector  150  travel across the lens of the optical assemblies  180 A and  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&#39;s eye, or it passes to the next optical strip. A combination of modulation of laser projector  150 , and modulation of optical strips, 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. 
     In one example, the produced visible output on the optical assembly  180 A-B of the eyewear device  100  includes an overlay image that overlays at least a portion of the field of view through the optical assemblies  180 A-B. In one example, the optical assemblies  180 A-B are see-through displays that present the overlay image as an overlay on a scene (or features within a scene) that the wearer is viewing through the lenses of the optical assembly. In another example the optical assemblies  180 A-B are not see-through displays (e.g., are opaque displays) that present the overlay image by combining the overlay with real-time images captured by the cameras  114  of the eyewear device for presentation to the user on the displays. 
       FIG.  2 A  is a rear view of an example hardware configuration of the eyewear device  100 , which includes an eye movement tracker  213  on the frame  105 , for tracking the eye movement of the user of the eyewear device  100 . The eye movement tracker  213  of the eyewear device  100  includes an infrared emitter  215  and an infrared camera  220 . Visible light cameras typically include a blue light filter to block infrared light detection. In an example, the infrared camera  220  is a visible light camera, such as a low-resolution video graphic array (VGA) camera (e.g., 640×480 pixels for a total of 0.3 megapixels), with the blue filter removed. The infrared emitter  215  and the infrared camera  220  are co-located on the frame  105 , for example, both are shown as connected to the upper portion of the left rim  107 A. As described in further detail below, the frame  105  or one or more of the left and right corners  110 A-B include a circuit board that includes the infrared emitter  215  and the infrared camera  220 . The infrared emitter  215  and the infrared camera  220  can be connected to the circuit board by soldering, for example. 
     Other arrangements of the infrared emitter  215  and infrared camera  220  can be implemented, including arrangements in which the infrared emitter  215  and infrared camera  220  are both on the right rim  107 B, or in different locations on the frame  105 , for example, the infrared emitter  215  is on the left rim  107 A and the infrared camera  220  is on the right rim  107 B. In another example, the infrared emitter  215  is on the frame  105  and the infrared camera  220  is on one of the corners  110 A-B, or vice versa. 
     The infrared emitter  215  can be connected essentially anywhere on the frame  105 , left corner  110 A, or right corner  110 B to emit a pattern of infrared light  250  ( FIG.  2 C ) on the eye  252  of the user. Similarly, the infrared camera  220  can be connected essentially anywhere on the frame  105 , left corner  110 A, or right corner  110 B to capture at least one reflection variation  254  in the emitted pattern of infrared light from the eye of the user. 
     The infrared emitter  215  and infrared camera  220  are arranged to face inward toward the eye of the user with a partial or full angle of coverage of the eye in order to pick up an infrared image of the eye to track eye movement of the eye of the user. For example, the infrared emitter  215  and infrared camera  220  are positioned directly in front of the eye, in the upper part of the frame  105  or in the corners  110 A-B at either ends of the frame  105 . The eye movement includes a variation of eye direction on a horizontal axis, a vertical axis, or a combination thereof from the initial eye direction during presentation of the initial displayed image on the image display of optical assembly  180 A-B. 
     Eye movement tracker  213  can track eye movement by measuring the point of eye gaze direction (where the user is looking in the optical assembly  180 A-B of the eyewear device  100 ), comparing currently captured images to previously captured calibration images, or detecting motion of the eye relative to the head. For example, eye movement tracker  213  non-invasively measures eye motion utilizing video images from which the eye position is extracted. As noted above, a pattern of infrared light is emitted by the infrared emitter  215  and infrared light is reflected back from the eye with variations that are sensed and imaged by a video camera, such as infrared camera  220 . Data forming the picked up infrared image is then analyzed to extract eye rotation from changes in the reflection variations. Such video-based eye movement trackers typically utilize corneal reflection (first Purkinje image) and the center of the pupil as features to track over time. In a second example, a dual-Purkinje eye movement tracker, utilizes reflections from the front of the cornea (first Purkinje image) and the back of the lens (fourth Purkinje image) as features to track. In a third example, image features from inside the eye are tracked, such as the retinal blood vessels, and these features are followed as the eye of the user rotates. 
     Calibration of the eyewear device  100  based on the unique anatomical features of the eyes of the user may be performed before using the eye movement tracker  213  to track eye position. Generally, the user looks at a point or series of points, while the eye movement tracker  213  records the value that corresponds to each gaze position. Prior to presenting, via the image display of the optical assembly  180 A-B, the initial displayed image, eyewear device  100  calibrates the eye movement tracker  213  by presenting, via the image display of optical assembly  180 A-B, a series of calibration images for viewing by the eye of the user. Each of the calibration images has a respective point of interest at a respective known fixed position on the horizontal axis and the vertical axis. In response to the eye of the user viewing the respective point of interest, eyewear device  100  records, in an eye direction (e.g., scanpath) database, anatomical feature positions of the eye in relation to the respective known fixed position of the respective point of interest. 
     After calibration, the video-based eye movement tracker  213  can focus on one or both eyes of the user and records eye movement as the user (e.g., wearer of the eyewear device  100 ) looks at the image display of optical assembly  180 A-B. When infrared or near-infrared non-collimated light is shined on the pupil of the eye as the pattern of infrared light by the infrared emitter  215 , corneal reflections are generated in the reflection variations of infrared light. The vector between the pupil center and the corneal reflections in the captured infrared images contain the reflection variations of infrared light and can be used to compute the point of regard on surface or the eye gaze direction. 
     Two general types of infrared and near-infrared (also known as active light) eye movement tracking techniques can be utilized: bright-pupil and dark-pupil. Whether bright-pupil or dark-pupil is utilized depends on the location of the illumination source (infrared emitter  215 ) with respect to the infrared camera  220  and the eye of the user. If the illumination from the infrared emitter  215  is coaxial with the optical path, then the eye acts as a retroreflector as the light reflects off the retina generating a bright pupil effect similar to red eye. If the illumination from the infrared emitter  215  is offset from the optical path, then the pupil appears dark because the retro reflection from the retina is directed away from the infrared camera  220 . 
     In one example, the infrared emitter  215  of the eye movement tracker  213  emits infrared light illumination on the user&#39;s eye, which can be near-infrared light or other short-wavelength beam of low-energy radiation. Alternatively, or additionally, the eye movement tracker  213  may include an emitter that emits other wavelengths of light besides infrared and the eye movement tracker  213  further includes a camera sensitive to that wavelength that receives and captures images with that wavelength. For example, the eye movement tracker  213  may comprise a visible light camera that captures light in the visible light range from the eye, such as a red, green, and blue (RGB) camera. 
     As noted above, the eyewear device  100  is coupled to a processor and a memory, for example in the eyewear device  100  itself or another part of the system. Eyewear device  100  or the system can subsequently process images captured of the eye, for example, a coupled memory and processor in the system to process the captured images of the eye to track eye movement. Such processing of the captured images establishes a scanpath to identify movement of the user&#39;s eye. The scanpath includes the sequence or series of eye movements based on captured reflection variations of the eye. Eye movements are typically divided into such fixations and saccades—when the eye gaze pauses in a certain position, and when it moves to another position, respectively. The resulting series of fixations and saccades is called the scanpath. Smooth pursuit describes the eye following a moving object. Fixational eye movements include micro saccades: small, involuntary saccades that occur during attempted fixation. The scanpaths are then utilized to determine the field of view adjustment. 
     An eye direction database can be established during calibration. Since the known fixed position of the respective point of interests during calibration are known, that scanpath database can be used to establish similarities to the previously calibration images. Because the known fixed position of the point of interest is known when the calibration image and is recorded in the eye direction database, the eyewear device  100  can determine where the eye of the user is looking by comparing currently captured images of the eye with the eye direction database. The calibration image(s) which most closely resembles the currently captured image can have the known fixed position of the point of interest utilized as a good approximation of the eye direction for the currently captured image. 
       FIG.  2 B  is a rear view of an example hardware configuration of another eyewear device  200 . In this example configuration, the eyewear device  200  is depicted as including an eye movement tracker  213  on a right corner  210 B for tracking the eye movement of the user of the eyewear device. As shown, the infrared emitter  215  and the infrared camera  220  are co-located on the right corner  210 B. The eye movement tracker  213  or one or more components of the eye movement tracker  213  can alternatively or additionally be located on the left corner  210 A and other locations of the eyewear device  200 , for example, the frame  105 . Eye movement tracker  213  has an infrared emitter  215  and infrared camera  220  like that of  FIG.  2 A , but the eye movement tracker  213  can be varied to be sensitive to different light wavelengths as described previously in  FIG.  2 A . 
       FIG.  2 D  is a top cross-sectional view of the corner of the eyewear device  100  of  FIG.  1 A  depicting the right visible light camera  114 , a head movement tracker  109 , and a microphone  116 . Construction and placement of a left visible light camera is substantially similar to the right visible light camera  114 , except the connections and coupling are on the left lateral side  170 A. As shown, the eyewear device  100  includes a circuit board, which may be a flexible printed circuit board (PCB)  240 . The right hinge  126 B connects the right corner  110 B to a right temple  125 B of the eyewear device  100 . In some examples, components of the right visible light camera  114 , the flexible PCB  240 , or other electrical connectors or contacts may be located on the right temple  125 B or the right hinge  126 B. 
     The head movement tracker  109  includes, for example, an inertial measurement unit (IMU). An inertial measurement unit is an electronic device that measures and reports a body&#39;s specific force, angular rate, and sometimes the magnetic field surrounding the body, using a combination of accelerometers and gyroscopes, sometimes also magnetometers. The inertial measurement unit works by detecting linear acceleration using one or more accelerometers and rotational rate using one or more gyroscopes. Typical configurations of inertial measurement units contain one accelerometer, gyro, and magnetometer per axis for each of the three axes: horizontal axis for left-right movement (X), vertical axis (Y) for top-bottom movement, and depth or distance axis for up-down movement (Z). The gyroscope detects the gravity vector. The magnetometer defines the rotation in the magnetic field (e.g., facing south, north, etc.) like a compass which generates a heading reference. The three accelerometers to detect acceleration along the horizontal, vertical, and depth axis defined above, which can be defined relative to the ground, the eyewear device  100 , or the user wearing the eyewear device  100 . 
     Eyewear device  100  detects movement of the user of the eyewear device  100  by tracking, via the head movement tracker  109 , the head movement of the head of the user. The head movement includes a variation of head direction on a horizontal axis, a vertical axis, or a combination thereof from the initial head direction during presentation of the initial displayed image on the image display. In one example, tracking, via the head movement tracker  109 , the head movement of the head of the user includes measuring, via the inertial measurement unit  109 , the initial head direction on the horizontal axis (e.g., X axis), the vertical axis (e.g., Y axis), or the combination thereof (e.g., transverse or diagonal movement). Tracking, via the head movement tracker  109 , the head movement of the head of the user further includes measuring, via the inertial measurement unit  109 , a successive head direction on the horizontal axis, the vertical axis, or the combination thereof during presentation of the initial displayed image. 
     The right corner  110 B includes corner body  110 B and a corner cap, with the corner cap omitted in the cross-section of  FIG.  2 D . Disposed inside the right corner  110 B are various interconnected circuit boards, such as PCBs or flexible PCBs, that include controller circuits for right visible light camera  114 , 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). 
     Flexible PCB  240  is disposed inside the right corner  110 B and is coupled to one or more other components housed in the right corner  110 B. Although shown as being formed on the circuit boards of the right corner  110 B, the right visible light camera  114 B can be formed on the circuit boards of the left corner  110 A, the temples  125 A-B, or frame  105 . 
       FIG.  3    is a high-level functional block diagram of an example image selection and display system  300 . The image selection and display system  300  includes a mobile device, which is the eyewear device  100  in the example. The mobile device can communicate via one or more wireless networks or wireless links with other mobile devices  390  or server systems  398 . The image selection and display system  300  further includes the other mobile devices  390  and server systems  398 . A mobile device  390  may be a smartphone, tablet, laptop computer, access point, or other such device capable of connecting with eyewear device  100  using, for example, a low-power wireless connection  325  and a high-speed wireless connection  337 . The mobile device  390  is connected to the server system  398  via the network  395 . The network  395  may include any combination of wired and wireless connections. 
     The eyewear device  100  includes and supports a visible light camera  114 , a speaker  115 , a microphone  116 , a user interface  301 , an image display of the optical assembly  180 , image display driver  342 , image processor  312 , audio processor  313 , low-power circuitry  320 , and high-speed circuitry  330 . The components shown in  FIG.  3    for the eyewear device  100  are located on one or more circuit boards, for example a PCB or flexible PCB, in the temples. Alternatively, or additionally, the depicted components can be located in the corners, frames, hinges, or bridge of the eyewear device  100 . Memory  334  includes image capture programming  344 , image retrieval programming  345 , and device location/orientation programming  346  to perform the functions described herein for image selection and display. Memory  334  additionally includes a rendering engine  348  for rendering overlay images on the displays  180 A and  180 B using image processor  312  and image display driver  342 . 
     Image capture programming  344  implements instructions to cause the eyewear device  100  to capture, via the visible light camera  114 , image(s) of a scene and to add time stamp and location coordinates. Image retrieval programming  345  implements instructions to cause the eyewear device  100  to request images from the server system  398  or memory  334  based on the location where the images were captured in relation to the current location of the eyewear device  100 . Device location/orientation programming  346  implements instructions to cause the eyewear device  100  to determine the current location of the eyewear device  100  and to determine the orientation of the eyewear device (e.g., to determine the field of view through the optical assemblies  180 ). 
     As shown in  FIG.  3   , high-speed circuitry  330  includes high-speed processor  343 , memory  334 , and high-speed wireless circuitry  336 . In an example, the image display driver  342  is operated by the high-speed processor  343  in order to drive the image display of the optical assembly  180 . High-speed processor  343  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  343  includes processing resources needed for managing high-speed data transfers on high-speed wireless connection  337  to a wireless local area network (WLAN) using high-speed wireless circuitry  336 . In some examples, the high-speed processor  343  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  334  for execution. In addition to any other responsibilities, the high-speed processor  343  executes a software architecture for the eyewear device  100  to manage data transfers with high-speed wireless circuitry  336 . In some examples, high-speed wireless circuitry  336  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, high-speed wireless circuitry  336  implements other high-speed communications standards. 
     Low-power wireless circuitry  324  and the high-speed wireless circuitry  336  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  390 , including the transceivers communicating via the low-power wireless connection  325  and high-speed wireless connection  337 , may be implemented using details of the architecture of the eyewear device  100 , as can other elements of network  395 . 
     Memory  334  includes a storage device capable of storing various data and applications, including, among other things, camera data generated by the visible light camera  114  and the image processor  312 , as well as images generated for display by the image display driver  342  on the image display of the optical assembly  180  and audio data generated by the microphone  116  and the audio processor  313 . While memory  334  is shown as integrated with high-speed circuitry  330 , in other examples, memory  334  may be an independent standalone element of the eyewear device  100 . In some examples, electrical routing lines may provide a connection through a chip that includes the high-speed processor  343  from the image processor  312 /audio processor  313  or low-power processor  324  to the memory  334 . In other examples, the high-speed processor  343  may manage addressing of memory  334  such that the low-power processor  324  will boot the high-speed processor  343  any time that a read or write operation involving memory  334  is needed. 
     Eyewear device  100  further includes a global positioning system  331 , a compass  332 , and an inertial measurement unit  333 . GPS  331  is a receiver for use in a satellite-based radio navigation system that receives geolocation and time information from GPS satellites. Compass  332  provides direction relative to geographic cardinal directions (or points). IMU  333  is an electronic device that measures and reports a force, angular rate, and/or orientation using a combination of accelerometers, gyroscopes, and/or magnetometers. 
     Eyewear device  100  may connect with a host computer. For example, the eyewear device  100  may pair with the mobile device  390  via the high-speed wireless connection  337  or connected to the server system  398  via the network  395 . In one example, eyewear device  100  captures, via the camera  114 , image of a scene and sends the images (along with location and timestamp information) to the host computer for forwarding to server system  398 . In another example, the eyewear device  100  receives images and/or instructions from the host computer. 
     The eyewear device  100  further includes other output component and input components. The other output components include acoustic components (e.g., speakers  115 ), haptic components (e.g., a vibratory motor), and other signal generators. The input components of the eyewear device  100 , the mobile device  390 , and server system  398 , may include alphanumeric input components (e.g., a keyboard, a touch screen configured to receive alphanumeric input, a photo-optical keyboard, or other alphanumeric input components), point-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 physical button, a touch screen that provides location and force of touches or touch gestures, or other tactile input components), audio input components (e.g., a microphone), and the like. 
     Image selection and display system  300  may optionally include additional peripheral device elements  319 . Such peripheral device elements  319  may include biometric sensors, additional sensors, or display elements integrated with eyewear device  100 . For example, peripheral device elements  319  may include any I/O components including output components, motion components, position components, or any other such elements described herein. 
     For example, the biometric components of the image selection and display system  300  include components to detect expressions (e.g., hand expressions, facial expressions, vocal expressions, body gestures, or eye tracking), measure biosignals (e.g., blood pressure, heart rate, body temperature, perspiration, or brain waves), identify a person (e.g., voice identification, retinal identification, facial identification, fingerprint identification, or electroencephalogram based identification), and the like. The motion components include acceleration sensor components (e.g., accelerometer), gravitation sensor components, rotation sensor components (e.g., gyroscope), and so forth. The position components include location sensor components to generate location coordinates (e.g., a Global Positioning System (GPS) receiver component), WiFi or Bluetooth™ transceivers to generate positioning system coordinates, altitude sensor components (e.g., altimeters or barometers that detect air pressure from which altitude may be derived), orientation sensor components (e.g., magnetometers), and the like. Such positioning system coordinates can also be received over wireless connections  325  and  337  from the mobile device  390  via the low-power wireless circuitry  324  or high-speed wireless circuitry  336 . 
     In one example, image processor  312  comprises a microprocessor integrated circuit (IC) customized for processing image sensor data from the visible light camera  114 , along with volatile memory used by the microprocessor to operate. In order to reduce the amount of time that image processor  312  takes when powering on to processing data, a non-volatile read only memory (ROM) may be integrated on the IC with instructions for operating or booting the image processor  312 . This ROM may be minimized to match a minimum size needed to provide basic functionality for gathering sensor data from visible light camera  114 , such that no extra functionality that would cause delays in boot time are present. The ROM may be configured with direct memory access (DMA) to the volatile memory of the microprocessor of image processor  312 . DMA allows memory-to-memory transfer of data from the ROM to system memory of the image processor  312  independent of operation of a main controller of image processor  312 . Providing DMA to this boot ROM further reduces the amount of time from power on of the image processor  312  until sensor data from the visible light camera  114  can be processed and stored. In some examples, minimal processing of the camera signal from the visible light camera  114  is performed by the image processor  312 , and additional processing may be performed by applications operating on the mobile device  390  or server system  398 . 
     Low-power circuitry  320  includes low-power processor  322  and low-power wireless circuitry  324 . These elements of low-power circuitry  320  may be implemented as separate elements or may be implemented on a single IC as part of a system on a single chip. Low-power processor  324  includes logic for managing the other elements of the eyewear device  100 . Low-power processor  324  is configured to receive input signals or instruction communications from mobile device  390  via low-power wireless connection  325 . Additional details related to such instructions are described further below. Low-power wireless circuitry  324  includes circuit elements for implementing a low-power wireless communication system via a short-range network. Bluetooth™ Smart, also known as Bluetooth™ low energy, is one standard implementation of a low power wireless communication system that may be used to implement low-power wireless circuitry  324 . In other examples, other low power communication systems may be used. 
     Mobile device  390  and elements of network  395 , low-power wireless connection  325 , and high-speed wireless architecture  337  may be implemented using details of the architecture of mobile device  390 , for example utilizing the short range XCVRs and WWAN XCVRs of mobile device  390  described in  FIG.  4   . 
       FIG.  4    is a high-level functional block diagram of an example of a mobile device  390  that provides processing for the image selection and display system  300  of  FIG.  3   . Shown are elements of a touch screen type of mobile device  390  having image capture programming  344 , image retrieval programming  345 , and device location/orientation programming  346  loaded along with other applications such as a chat application. Examples of touch screen 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 touch screen type devices is provided by way of example; and 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  390  having a touch screen display for displaying content and receiving user input as (or as part of) the user interface. Mobile device  390  also includes a camera(s)  470 , such as visible light camera(s), and a microphone  471 . 
     As shown in  FIG.  4   , the mobile device  390  includes at least one digital transceiver (XCVR)  410 , shown as WWAN XCVRs, for digital wireless communications via a wide area wireless mobile communication network. The mobile device  390  also includes additional digital or analog transceivers, such as short range XCVRs  420  for short-range network communication, such as via NFC, VLC, DECT, ZigBee, Bluetooth™, or WiFi. For example, short range XCVRs  420  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 and WiMAX. 
     To generate location coordinates for positioning of the mobile device  390 , the mobile device  390  can include a global positioning system (GPS) receiver  331 . Alternatively, or additionally the mobile device  390  can utilize either or both the short range XCVRs  420  and WWAN XCVRs  410  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 the eyewear device  100  over one or more network connections via XCVRs  420 . Additionally, mobile device  390  can include a compass  332  and an inertial measurement unit  333  for determining direction information. 
     The transceivers  410 ,  420  (network communication interfaces) conform to one or more of the various digital wireless communication standards utilized by modern mobile networks. Examples of WWAN transceivers  410  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  410 ,  420  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  390  for user authorization strategies. 
     The mobile device  390  further includes a microprocessor, shown as CPU  430 . 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 processor  430 , 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. Other processor circuitry may be used to form the CPU  430  or processor hardware in smartphone, laptop computer, and tablet. 
     The microprocessor  430  serves as a programmable host controller for the mobile device  390  by configuring the mobile device  390  to perform various operations, for example, in accordance with instructions or programming executable by processor  430 . For example, such operations may include various general operations of the mobile device, as well as operations related to determining the location of the device when an image is captured and determining the location and orientation of the device when generating and presenting image overlays. 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  390  includes a memory or storage device system, for storing data and programming. In the example, the memory system may include a flash memory  440 A and a random access memory (RAM)  440 B. The RAM  440 B serves as short term storage for instructions and data being handled by the processor  430 , e.g., as a working data processing memory. The flash memory  440 A typically provides longer term storage. 
     Depending on the type of device, the mobile device  390  stores and runs a mobile operating system through which specific applications, which may include image capture programming  344 , image retrieval programming  345 , device location/orientation programming  346 , and rendering engine  348 , are executed. However, in some implementations, programming may be implemented in firmware or a combination of firmware and an application layer. For example, the instructions to capture the image of the scene, track positional and orientation information of the device, and generate an overlay may reside in firmware (e.g., with a dedicated GPU or VPU SOC). Instructions to produce the visible output to the user may reside in an application. Applications, like the audio visualizer programming  344  and other applications, may be a native application, a hybrid application, or a web application (e.g., a dynamic web page executed by a web browser) that runs on mobile device  390 . Examples of mobile operating systems include Google Android, Apple iOS (I-Phone or iPad devices), Windows Mobile, Amazon Fire OS, RIM BlackBerry operating system, or the like. 
       FIGS.  5 A,  5 B,  5 C,  5 D,  5 E, and  5 F  are flowcharts  500 ,  505 ,  520 ,  530 ,  532 , and  536 , respectively, illustrating example operation of a mobile device (e.g., an eyewear device  100 ) or a mobile device  390  and other components of the image selection and display system  300 . Although shown as occurring serially, one or more of the blocks in flow charts  500 ,  505 ,  520 ,  530 ,  532 , and/or  536  may be reordered or parallelized depending on the implementation. 
     The flowcharts are described below with reference to an example where the mobile device is an eyewear device  100  that captures and presents images. It is understood that the functionality described with reference to the eyewear device  100  may be performed by other eyewear devices and other mobile devices such as mobile phones and tablets. Suitable modifications for implementation of the following with other mobile devices (including those with see through displays and those with non-see through displays such as touchscreens) will be readily understood from the description herein. 
     With reference to flow chart  500  of  FIG.  5 A , at block  502 , the eyewear device  100  captures content (e.g., images, audio, and associated meta data). The eyewear device  100  captures images, e.g., using visible light camera  114 , and stores the images in memory  334 . Additionally, the eyewear device  100  captures location coordinates and timestamp information, e.g., using GPS  331  and image processor  312 , and stores the location coordinates and timestamp information in memory  334 . The eyewear device  100  stores the location coordinates and timestamp information as meta data associated with the respective images it captures. The images, audio, and meta data are captured by many mobile devices throughout the physical world. 
     At block  504 , the eyewear device  100  sends the images and associated meta data to the server  398 . The eyewear device  100  (and other mobile devices) sends the images and meta data captured at block  502  to the server system  398 , e.g., through network  395  and optionally mobile device  390 , for aggregation and central storage. 
     With reference to flow chart  505  of  FIG.  5 B , at block  506 , the server  398  receives the images and meta data and, at block  508 , the server  398  stores the received images and meta data. In an example, the server  398  receives and stores images and meta data from millions of mobile devices. As such, the server  398  generates a repository of images for later retrieval by the mobile devices. 
     At block  510 , the server  398  receives location coordinates for the eyewear device  100 . In an example, the server  398  receives GPS position location coordinates from the eyewear device  100 . The server  398  may receive location coordinates via network  395  and optionally mobile device  390 . 
     At block  512 , the server  398  retrieves images from memory corresponding to where they were captured in relation to the location coordinates of the eyewear device  100 . In an example, the server identifies a coordinate range surrounding the location coordinates of the eyewear device  100  that includes, for example, all GPS coordinates within a half mile of the GPS location coordinates received from the mobile device representing the current position of the eyewear device  100 . The server  398  then identifies all images having location coordinates meta data that are within the coordinate range surrounding the location coordinates of the eyewear device  100 . 
     At block  514 , the server  398  sends to the eyewear device  100  the images corresponding to where they were captured in relation to the location coordinates of the eyewear device  100 . In an example, the server  398  organizes the images chronologically and based on distance from the eyewear device  100  such that recent images that are relatively close to the current position of the eyewear device  100  are sent before older images and/or images with meta data indicating a location that is relatively far away. 
     With reference to flow chart  520  of  FIG.  5 C , at block  522 , the eyewear device  100  monitors its location. The eyewear device  100  may monitor its location using GPS  331 . Location coordinates monitored by the eyewear device may be used to capture location coordinates meta data being added to images sent to the server  398  and as described below for retrieving and displaying content. 
     At block  524 , the eyewear device  100  monitors its orientation corresponding to a field of view. The eyewear device  100  field of view is a view seen through the optical elements (assuming see-through displays). The eyewear device  100  monitors its orientation in three-dimensional space (e.g., two axes X and Y or three axes X, Y, and Z) and rotation about one or more axes (e.g., pitch, yaw, and/or roll). The eyewear device  100  may use various sensors to monitor its orientation, e.g., the compass  332  to determine direction and the IMU  333  to determine orientation. In an example, where a tablet is a mobile device, the field of view is the image viewed on a screen that is substantially simultaneously being captured by a visible light camera of the tablet. 
     At block  526 , the eyewear device  100  sends its location coordinates (monitored at block  522 ) to the server  398 . The eyewear device  100  send its location coordinates to the server system  398  through, for example, network  395  and optionally mobile device  390 . 
     At block  528 , the eyewear device  100  receives images corresponding to its location from the server  398  (which determines images as described with reference to block  512 ). The eyewear device  100  receives images from the server system  398  through, for example, network  395  and optionally mobile device  390 . 
     At block  530 , the eyewear device  100  selects images corresponding to the location and orientation of the eyewear device  100  for display in the viewing area of the eyewear device  100 . In an example, the eyewear device  100  selects images by determining orientation of the mobile device (block  530   a ;  FIG.  5 D ), determining its viewing area (e.g., field of view; block  530   b ), calculating a location coordinate range within the field of view for the determined orientation (block  530   c ), and selecting images having location coordinates within the calculated location coordinate ranges (block  530   d ). Orientation may be determined as described above with reference to block  524 . Field of view may then be determined based on an angular value associated with the optical assembly (e.g., a cone of 30 degrees surrounding the direction a central axis of the optical assembly is pointing). A coordinate range is then calculated for all coordinates within the field of view extending one half mile from the eyewear device  100  (e.g., all coordinates within the cone of 30 degrees having a distance of one-half mile between the tip and base of the cone). The eyewear device  100  then identifies all images having location coordinates meta data that are within the calculated coordinate range. 
     At block  532 , the eyewear device  100  generates overlay images including image icons associated with the selected images for presentation by the mobile device. In an example, the eyewear device  100  generates overlay images by monitoring orientation of the mobile device ( 532   a ), monitoring the field of view of the mobile device ( 532   b ), calculating location coordinates within the field of view for the determined orientation ( 532   c ), and mapping the select images to the calculated location coordinates ( 532   d ). Optionally, the eyewear device  100  may identify visual cues within the field of view ( 532   e ) for refining the mapping and displaying of content. For example, buildings, restaurants, concert venues, and landmarks may be identified (e.g., using object recognition technology.) The eyewear device  100  then generates image icons (which may be thumbnails of the received content) and positions the image icons within an overlay image responsive to calculated location coordinates and visual cues ( 532   f ). 
     The eyewear device  100  may aggregate content corresponding to a particular location. In one example, all content within a location range associated with a particular visual cue such as a restaurant may be represented by an icon thumbnail image corresponding to the most recent content (e.g., image or video) of that content within the location range. In another example, the icons may be stacked on top of one another with only the icon for the most recent content fully visible. Additionally, the eyewear device  100  may alter the icon based on factors such as distance to the visual cue or quantity of content with the icon being reduced in size the further it is away from the mobile device and increased in size for larger quantities. 
     At block  534 , the eyewear device  100  presents the overlay image on the optical assembly  180  of the eyewear device  100 .  FIG.  6 A  depicts an example scene viewed through an optical assembly  180  of the eyewear device  100  with an overlay image. In the illustrated example, the scene is a pier extending from a beach into the water. The overlay image includes three icons  600 . A first icon  600   a  represents content captured at a particular location on the beach at the water&#39;s edge. A second icon  600   b  represents content depicting a street performer captured at a midpoint on the pier. A third icon  600   c  represents content captured at the end of the pier. In the illustrated example, the first icon  600   a  is bigger than the second icon  600   b  and the third icon  600   c  because the content was captured at a location closer to the current location of the eyewear device  100 . In other example, the second icon  600   b  may be bigger than the first icon  600   a  if, for example, there were 10 videos of the street performer captured within the last hour and only one image captured at the water&#39;s edge. 
     At block  536 , the eyewear device  100  receives an image selection identifying one of the image icons in the presented overlay image. Eyewear device may receive the image selection via a user interface  301 . In one example, the optical assembly  180  and eye movement tracker  213  provide the input selection.  FIG.  6 A  depicts a cursor  602  positioned on the optical assembly  180  indicating the current position for user interaction. The eye movement tracker  213  tracks the eye of the wearer of the eyewear device  100  and moves the cursor responsive the movement of the eye (blocks  536   a  and  536   b ;  FIG.  5 F ). To select content, the user can adjust their gaze toward one of the icons, which moves the cursor  602  to that icon. In one example, content is selected when the user&#39;s gaze on the icon associated with that content exceeds a predetermined period of time (e.g., 250 milliseconds; blocks  536   c  and  536   d ). In another example, content is selected when the user&#39;s gazes at the icon associated with that content and performs a specific action detected by the eye movement tracker  213  (e.g., blinking twice in rapid succession). In examples where the mobile device is, for example, a tablet with a touchscreen display, the overlay with icons is presented on the touchscreen display of the mobile device and the user may make a selection by pressing an icon with their finger. 
     At block  538 , the eyewear device  100  presents the selected image associated with the identified image icon. The image processor  312  and image display driver  342  present the image on the optical assembly  180  of the eyewear device  100 .  FIG.  6 B  depicts content  604  (e.g., a video) on the optical assembly  180 . In the illustrated example, the content  604  is associated with the icon  600   b  ( FIG.  6 A ) and is presented in response to selection of that icon. 
     At block  540 , the eyewear device  100  monitors for an image termination selection. Eyewear device may receive the image termination selection via a user interface  301 . In one example, the eye movement tracker  213  provide the image termination selection in response to a specific action detected by the eye movement tracker  213  (e.g., blinking three times in rapid succession) or gazing in a specific direction for a prolonged period of time (e.g., up and to the right for over 250 milliseconds). In another example, the user interface  301  may be a physical button or touchpad on the eyewear device  100  and the user may select image termination by pressing the button or swiping a finger across the touchpad (e.g., downward). 
     At block  542 , the eyewear device  100  processes a decision based on whether an image termination selection is received. If an image termination selection is received, processing proceeds at block  544  with the presentation of the image canceled and the optical assembly reverting to depicting icons such as depicted in  FIG.  6 A  and repeating the steps of blocks  522 - 542 . If an image termination selection is not received, processing proceeds at block  546 . 
     At block  546 , the eyewear device  100  processes a decision based on whether there is additional content corresponding to the location of the selected image associated with the identified image icon. If there is not additional content, the optical assembly reverting to depicting icons such as depicted in  FIG.  6 A  and repeating the steps of blocks  522 - 542 . If there is additional content (e.g., one or more additional image(s) corresponding to the location of the selected image associated with the identified image icon), processing proceeds at block  548 . 
     At block  548 , the eyewear device  100  receives an image advance selection. The additional images may be stored such that they are presented in reverse chronological order (i.e., from newest to oldest). The image advance selection cycles through the ordered images. In one example, the eye movement tracker  213  provide the image advance selection in response to a specific action detected by the eye movement tracker  213  (e.g., blinking twice in rapid succession) or gazing in a specific direction for a prolonged period of time (e.g., down and to the left for over 250 milliseconds). In another example, the user interface  301  may be a physical button or touchpad on the eyewear device  100  and the user may select an image forward advance by a specific press of the button (e.g., one press) or with a swiping gesture with a finger across the touchpad (e.g., back to front). In accordance with this example, the user may select an image backward advance (e.g., to view previously viewed or skipped content) by another specific press of the button (e.g., double press) or another swiping gesture with a finger across the touchpad (e.g., front to back). 
     At block  550 , the eyewear device  100  identifies an additional image responsive to the image advance selection and, at block  552 , the eyewear device  100  presents the identified image. The image processor  312  and image display driver  342  present the additional image on the optical assembly  180  of the eyewear device  100 . 
     Any of the methods described herein such as the image capture programming  344 , the image retrieval programming  345 , the device location/orientation programming  346 , and programming for the rendering engine  348  for the eyewear device  100 , mobile device  390 , and server system  398  can be embodied in one or more methods as method steps or in one or more applications as described previously. According to some examples, an “application,” “applications,” or “firmware” are program(s) that execute functions defined in the program, such as logic embodied in software or hardware instructions. Various programming languages can be employed to generate 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 be mobile software running on a mobile operating system such as IOS™, ANDROID™, WINDOWS® Phone, or another mobile operating system. In this example, the third-party application can invoke application programming interface (API) calls provided by the operating system to facilitate functionality described herein. The applications can be stored in any type of computer readable medium or computer storage device and be executed by one or more general-purpose computers. In addition, the methods and processes disclosed herein can alternatively be embodied in specialized computer hardware or an application specific integrated circuit (ASIC), field programmable gate array (FPGA) or a complex programmable logic device (CPLD). 
     Program aspects of the technology may be thought of as “products” or “articles of manufacture” typically in the form of executable code and/or associated data that is carried on or embodied in a type of machine-readable medium. For example, programming code could include code for navigation, eye tracking or other functions described herein. “Storage” type media include any or all the tangible memory of the computers, processors or the like, or associated modules thereof, such as various semiconductor memories, tape drives, disk drives and the like, which may provide non-transitory storage at any time for the software programming. All or portions of the software may at times be communicated through the Internet or various other telecommunication networks. Such communications, for example, may enable loading of the software from one computer or processor into another, for example, from the server system  398  or host computer of the service provider into the computer platforms of the eyewear device  100  and mobile device  390 . Thus, another type of media that may bear the programming, media content or meta-data files includes optical, electrical and electromagnetic waves, such as used across physical interfaces between local devices, through wired and optical landline networks and over various air-links. The physical elements that carry such waves, such as wired or wireless links, optical links or the like, also may be considered as media bearing the software. As used herein, unless restricted to “non-transitory”, “tangible”, or “storage” media, terms such as computer or machine “readable medium” refer to any medium that participates in providing instructions or data to a processor for execution. 
     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(s) 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 and/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. 
     The scope of protection is limited solely by the claims that now follow. That scope is intended and should be interpreted to be as broad as is consistent with the ordinary meaning of the language that is used in the claims when interpreted considering this specification and the prosecution history that follows and to encompass all structural and functional equivalents. Notwithstanding, none of the claims are intended to embrace subject matter that fails to satisfy the requirement of Sections 101, 102, or 103 of the Patent Act, nor should they be interpreted in such a way. Any unintended embracement of such subject matter is hereby disclaimed. 
     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, 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.