Abstract: A head-mounted device may include display projectors and waveguides. The head-mounted device may have a head-mounted housing in which the display projectors and waveguides are mounted. The head-mounted housing may have a housing wall forming cavities containing the display projectors and waveguides. A moisture-impermeable cover may be used to cover and protect each of the display projectors. The cover may be formed from an elastomeric sock. The sock may have an opening that allows the display projector to emit image light that is received by a corresponding one of waveguides. Partitions may also be formed in the housing to block moisture and other contaminants. An elastomeric gasket or bellows serving as a partition may be used to separate a display projector cavity from a waveguide cavity.

Abstract: A system may include a head-mounted device and a storage case for storing and calibrating the head-mounted device. The storage case may include a recess that receives the head-mounted device. The case may include optically detectable features for calibrating cameras in the head-mounted device. For example, the case may include optical charts, physical fiducials, and/or reflective calibration spheres for calibrating inward-facing cameras on the head-mounted device such as gaze tracking image sensors. For calibrating outward-facing cameras on the head-mounted device that have larger focal distances, the case may include a light source and a diffractive optical element to create a light pattern that virtually originates from infinity. The case may include cameras for capturing images of displayed images on the head-mounted device to determine if a waveguide and display in the head-mounted device are misaligned.

Abstract: A wearable electronic device can include displays and/or cameras that can be calibrated for accurate recording and visual output. Whereas some aspects of a wearable electronic device can be calibrated at the time of production, usage and wear of the wearable electronic device can result in certain components becoming misaligned. A calibration device can provide an output that serves as a reference for each of a pair of displays of the wearable electronic device. Each of the displays can be independently adjusted so their corresponding outputs are properly aligned with the view of the external environment.

Abstract: A head-mounted device may include a first display having a first projector and a first waveguide, a second display having a second projector and a second waveguide, first and second cameras, an optical sensor that couples the first waveguide to the second waveguide, and position sensors mounted to the first and second cameras and the optical sensor. The optical sensor may gather image sensor data from first image light propagating in the first waveguide and second image light propagating in the second waveguide. The cameras may capture real-world images. The position sensors may gather position measurements. Control circuitry may calibrate optical misalignment in the device by adjusting the first and/or second image light based on the image sensor data, the position measurements, and/or the world light.

Abstract: In examples, a method comprises receiving input from a first user relating to a first variable of a first portion of a road network, determining first semantic data associated with the first variable, determining the absence of a lock for the first portion based on the first semantic data, and causing a first lock to be implemented for the first portion based on the first semantic data. The first lock in examples indicates that users other than the first user are to be prevented from making changes to a first set of variables of the first portion that are associated with the first semantic data.

Abstract: A securement arm for an optical device includes a first portion having a first electronic component, the first portion connected to a viewing frame of the optical device. The securement arm also includes a second portion having a second electronic component coupled to the first portion by a spring element. The spring element can include a plastic deformation element and an elastic element. The securement arm also includes an electrical connector extending through the spring element and electrically connecting the first electronic component and the second electronic component.

Abstract: A head-mounted device may have head-mounted support structures configured to be worn on a head of a user. The head-mounted device may have stereo optical components such as left and right cameras or left and right display systems. The optical components may have respective left and right pointing vectors. Deformation of the support structures may cause the camera pointing vectors and/or the display system pointing vectors to become misaligned. Sensor circuitry such as strain gauge circuitry may measure pointing vector misalignment. Control circuitry may control the cameras and/or the display systems to compensate for measured changes in pointing vector misalignment.

Abstract: Techniques are discussed for generating, maintaining, and accessing maps to be used for vehicle localization and navigation. A map of a region may include map data representing discrete tiles of the region, and be associated with a map manifest listing pointers to content of the map. In some cases, the map manifest may have a recursive structure which references other map manifests. The map files may be stored on a storage system that avoids duplication and allows efficient determination of changes to content. For example, the stored map files may each be associated with a content-based hash value, which may be incorporated into a filename or URI of the map file. Computing systems on a vehicle may use comparison of the content-based hash values to determine files that have changed and need to be downloaded. The computing systems may also use hash values to determine accuracy of downloaded files.

Abstract: A head-mounted device such as a pair of glasses may have a head-mounted housing. The head-mounted device may include displays such as projector displays and may include associated optical components. The optical components may include waveguides that are used in providing images received from the displays to corresponding eye boxes for viewing by a user. Changes in the relative orientation between the displays and waveguides may warp the images in the eye boxes. To compensate for this effect, control circuitry in the head-mounted device may use position sensors to measure the relative positions of the displays and waveguides. Image warping due to misalignment between the displays and waveguides may be removed by applying compensating image warping to the images being produced by the displays.

Abstract: A head-mounted device may have display projectors that provide images. Waveguides may be used in conveying the images to eye boxes. Optical couplers such as prisms may be used to couple the images from the projectors into the waveguides. The waveguides may guide the images to output couplers that couple the images toward eye boxes for viewing by a user. During operation of the head-mounted device, sensor circuitry may be used to measure for potential misalignment between optical components such as projectors, couplers, and waveguides. Control circuitry may provide control commands to zero hold power piezoelectric actuators or other positioners based on the sensor measurements, thereby tilting and otherwise repositioning the optical components relative to each other to correct for optical component misalignment.

Abstract: A head-mounted device may have a head-mounted frame. The head-mounted frame may have an internal frame member such as a metal frame member (metal frame structure). Frame structures such as polymer frame structures may be molded over the internal frame member and may be provided with lens openings. The head-mounted device may have lenses with waveguides that are mounted in the lens openings. The waveguides may be used in guiding images received from projectors to eye boxes for viewing by a user. Strain gauge circuitry may be attached to a central portion of the internal frame member. During operation of the head-mounted device, the strain gauge circuitry may measure for deformation of the internal frame member, so that image warping operations may be performed or so that other actions may be taken to correct for image distortion arising from the measured deformation.

Abstract: A head-mounted device may have a head-mounted frame with lens openings. The head-mounted device may have left and right lenses mounted in the lens openings. The lenses may include waveguides that help guide images from projectors to eye boxes for viewing by a user. The frame may include a metal frame member that supplies the frame with structural support. Circuitry such as strain gauge circuitry and cabling may be coupled to the metal frame member. A protective polymer such as thermoset epoxy may be used to encapsulate and protect the circuitry. The protective polymer may encapsulate the strain gauge, the cabling, and/or other circuitry so that this circuitry need not be exposed to elevated temperatures during subsequent injection molding operations. Injection molding may be used to apply one or more shots of thermoplastic polymer to the metal frame member to form the head-mounted frame.

Abstract: A head-mounted device may have projectors that provide images. Waveguides in lenses may be used in conveying the images to eye boxes. A head-mounted frame in the head-mounted device may have lens openings that receive the lenses. The frame may include a frame member such as an elongated metal member that extends across the frame above the left and right lenses. The frame may include frame structure such as polymer structures that cover the frame member and that are configured to form the lens openings. The frame member may have a cable channel. Cabling may be used to route signals between the projectors, strain gauge circuitry, control circuitry, and other circuits in the head-mounted device. The cabling may be received within the cable channel and encapsulated in a protective polymer. Additional polymer may be molded over the protective polymer to form the frame.

Abstract: Various methods are provided for secure two-factor authentication, and more specifically, for incorporating a layer of security to two-factor authentication using Short Message Service in a manner virtually transparent to the end-user. Methods may include receiving a request for registration for two-factor authentication from a client including a username and password; providing a request for a mobile device number; receiving the mobile device number and a pre-shared key; sending to a mobile device an identity of the client and a server key share; receiving from the mobile device a mobile device key share; sending information corresponding to an exchange with the mobile device and a challenge derived from the pre-shared key to the client in response to the device key share corresponding to the server key share; receiving confirmation of registration with the mobile device; and establishing a shared key in response to verification of the confirmation.

Abstract: A head-mounted device may have head-mounted support structures configured to be worn on a head of a user. The head-mounted device may have stereo optical components such as left and right cameras or left and right display systems. The optical components may have respective left and right pointing vectors. Deformation of the support structures may cause the camera pointing vectors and/or the display system pointing vectors to become misaligned. Sensor circuitry such as strain gauge circuitry may measure pointing vector misalignment. Control circuitry may control the cameras and/or the display systems to compensate for measured changes in pointing vector misalignment.

Abstract: A head-mounted device may have head-mounted support structures configured to be worn on a head of a user. The head-mounted device may have stereo optical components such as left and right cameras or left and right display systems. The optical components may have respective left and right pointing vectors. Deformation of the support structures may cause the camera pointing vectors and/or the display system pointing vectors to become misaligned. Sensor circuitry such as strain gauge circuitry may measure pointing vector misalignment. Control circuitry may control the cameras and/or the display systems to compensate for measured changes in pointing vector misalignment.

Abstract: Techniques for generating and validating map data that may be used by a vehicle to traverse an environment are described herein. The techniques may include receiving sensor data representing an environment and receiving map data indicating a traffic control annotation. The traffic control annotation may be associated, as projected data, with the sensor data based at least in part on a position or orientation associated with a vehicle. Based at least in part on the association, the map data may be updated and sent to a fleet of vehicles. Additionally, based at least in part on the association the vehicle may determine to trust the sensor data more than the map data while traversing the environment.

Abstract: Various methods are provided for secure two-factor authentication, and more specifically, for incorporating a layer of security to two-factor authentication using Short Message Service in a manner virtually transparent to the end-user. Methods may include receiving a request for registration for two-factor authentication from a client including a username and password; providing a request for a mobile device number; receiving the mobile device number and a pre-shared key; sending to a mobile device an identity of the client and a server key share; receiving from the mobile device a mobile device key share; sending information corresponding to an exchange with the mobile device and a challenge derived from the pre-shared key to the client in response to the device key share corresponding to the server key share; receiving confirmation of registration with the mobile device; and establishing a shared key in response to verification of the confirmation.

Abstract: Systems and methods are provided for generating numerical values indicative of risk factors across multiple dimensions in an organization. A first hierarchy of auditable entities in an organization are generated using a first parameter, and a second hierarchy of auditable entities in the same organization are generated using a second parameter. The first hierarchy and the second hierarchy correspond to a first dimension and a second dimension of the organization, respectively. An indication of a risk factor and a numerical score for the risk factor are received. Additionally, selections of a first auditable entity in the first hierarchy and a second auditable entity in the second hierarchy, with which the risk factor is to be associated, are received. In response to the received selections, respective risk scores for the first auditable entity and the second auditable entity are automatically calculated using the received numerical score for the risk factor.

Abstract: The present invention features a single aqueous solution that imparts acceptable levels of water resistance, fire resistance, mold resistance and pest resistance to wood, and which may be used in standard wood treatment techniques commonly utilized in the wood treatment industry. The aqueous solution contains a fire retardant, an insect and termite repellant, a mold inhibitor and a pH buffer.