Abstract: A vehicular cabin monitoring system includes an interior rearview mirror assembly having a mirror head that accommodates a prismatic mirror reflective element. A camera is accommodated by the mirror head. The mirror reflective element is adhesively attached at a mirror back plate of the mirror head. An optically clear adhesive (OCA) and a neutral density (ND) filter are disposed between the mirror back plate and a mirror reflector coating disposed at a rear side of the mirror reflective element. The camera views through (i) the OCA, (ii) the ND filter, (iii) the mirror reflector coating of the mirror reflective element, and (iv) the glass substrate of the mirror reflective element. With the interior rearview mirror assembly attached at an interior portion of a vehicle, image data captured by the camera is processed at an electronic control unit (ECU) for a cabin monitoring function.

Abstract: This application provides a data processing method and an apparatus. The data processing method includes: acquiring a first frame of time-of-flight (TOF) data; processing the first frame of TOF data into a TOF image; and performing face recognition by using the first frame of TOF image to obtain a recognition result. When TOF data is used for face recognition, higher security can be achieved. In addition, the first frame of TOF image is used for face recognition immediately after the first frame of TOF image is obtained, so that the execution speed is high. Because the TOF data is less affected by light, a high-quality TOF image can be obtained even if the first frame of TOF data is used, and therefore, the recognition accuracy is high.

Abstract: This disclosure discloses a display method performed by an electronic device which includes a first screen, a foldable screen, and a first camera. The foldable screen may be folded into a second screen and a third screen. Orientations of the first screen and the second screen are opposite. The method includes: when it is determined that the electronic device is in a first preset posture, displaying a first user interface on the first screen, where the first user interface includes an image captured by the first camera; when it is determined that the electronic device is in a second preset posture, displaying a second user interface on the second screen, where the second user interface includes an image captured by the second camera. In this way, in a specific posture of the electronic device, a corresponding camera and display are automatically started for real-time preview, thereby avoiding complex user operations.

Abstract: A system including a range of motion, quality of sleep, overall, and control modules. The range of motion module, prior to a procedure being performed on a patient, determines a first range of motion score of the patient based on a first signal generated by a sensor. The quality of sleep module, prior to the procedure being performed on the patient, determines a first quality of sleep score or a first pain score based on the first signal. The overall module determines a combined score based on the first range of motion score and the first quality of sleep score or the first pain score. The control module compares the combined score to a predetermined threshold and predicts an outcome of the procedure based on the comparison. The control module, based on the combined score, determines whether to perform the procedure, adjust the procedure or refrain from performing the procedure.

Abstract: A system including a light source that, in operation, projects dots onto a target, the dots being formed by first light; a first photodetector that, in operation, detects second light resulting from the projection of the dots onto the target; and a circuit that in operation, performs an individual authentication, wherein the individual authentication includes at least the following step (i) and step (ii): step (i) determining whether the target is a living body or not based on the second light, and step (ii) performing a biometric authentication of the target.

Abstract: An ultrasound imaging system is controlled by pose and/or gesture detection. The system may detect poses or gestures performed by a user, e.g., using a machine learning (ML) model that may include a neural network, and implement a command associated with the detected pose or gesture to control the ultrasound imaging system.

Abstract: A method for monitoring cleaning of a medical room includes: receiving imaging of the medical room, the imaging capturing signatures of cleaning deposits on one or more surfaces of the medical room deposited via a cleaning process; analyzing the imaging to: identify one or more surfaces in the medical room that should be cleaned, and determine which of the one or more surfaces have been cleaned by identifying the signatures of the cleaning deposits; and displaying an indication of at least one of: (1) the surfaces that have been cleaned, and (2) one or more surfaces that have not been cleaned.

Abstract: An intelligent epidemic prevention system includes a calibration device, an access control system, a visible-light camera recording a first calibration device image of the calibration device and a first user image of a user, a thermographic camera recording a second calibration device image of the calibration device and a second user image of the user, and a computing device that calculates a calibration value according to the first and second calibration device images. The computing device determines whether the user wears a mask properly according to the first user image and generates a first result, and determines whether the temperature of the user is greater than or equal to a threshold temperature according to the calibration value and the second user image and generates a second result. The computing device controls the access control system to open or close according to the first and second results.

Abstract: A method to monitor a baby by evaluating live images through use of machine learning techniques. The bodily position of the baby is determined and a decision is made whether the position constitutes a potentially unsafe situation, such as a prone position correlated with Sudden Infant Death Syndrome events. In the event of an unsafe situation, an alarm is generated to alert the caretaker and allow a chance to intervene. This system is highly adaptable to user preferences by nature of allowing the user to select from a variety of image evaluation schemes.

Abstract: Systems and methods based on thermal imaging for rapid detection of fever conditions in humans that provide for extremely inexpensive, mass producible, field deployable devices accurate in specific, relatively low temperature ranges, and in particular temperatures near nominal human body temperature. The system may include a thermal imager tailored for the application and a corresponding mass producible controlled temperature calibration source configured to provide real time calibration near the human body temperature of interest. The imager and source are deployed in a way such that target people and the calibration source will be within the imager FOV for fever detection. The combination of real time near measurement temperature calibration, with suitable thermography approaches, yield fast, accurate measurements in the fever range using low cost, easy-to-produce components.

Abstract: The present disclosure provides an ultrasonic sensor, a method for driving the same, and a method for manufacturing the same. The ultrasonic sensor includes a back plate, a sounding structure on the back plate and a backing layer on a side of the sounding structure distal to the back plate; the sounding structure includes a plurality of emitting electrodes, an opposite electrode, a piezoelectric layer and a plurality of signal leads, and the plurality of emitting electrodes and the opposite electrode are respectively arranged on two sides of the piezoelectric layer; and the plurality of emitting electrodes are arranged in an array, and each of the emitting electrodes is individually coupled to one of the signal leads. The ultrasonic sensor may achieve an independent control for each patterned electrode such that the ultrasonic sensor may be used as a point sound source.

Abstract: Ultrasound imaging systems for automatically identifying and saving ultrasound images relevant to a needle injection procedure, and associated systems and methods, are described herein. For example, an ultrasound imaging system includes a transducer for transmitting/receiving ultrasound signals during a needle injection procedure, and receive circuitry configured to convert the received ultrasound signals into ultrasound image data. The image data can be stored in a buffer memory. A processor can analyze the image data stored in the buffer memory to identify image data that depicts a specified injection event of the needle injection procedure, and the identified image data can be stored in a memory for archival purposes.

Abstract: A contactless patient monitoring system includes a first imager configured to capture first image data of a target area within a first field of view. A second imager is operably coupled to the first imager. The second imager is configured to capture second image data of the target area within a second field of view. An emitter is operably coupled to at least one of the first imager and the second imager. The emitter is configured to emit light within a predetermined wavelength range. A controller is communicatively coupled to the first imager, the second imager, and the emitter. The controller is configured to determine a facial region of a person in the first image data, determine a region of interest in the second image data that coincides with the facial region in the first image data, and determine a coordinate of a head position within the facial region.

Abstract: A display system changes display in accordance with a gesture of an operator in a vehicle. The display system includes a gesture detector that detects the gesture, a vision area detector that detects a vision area of the operator, a display that displays a gesture operation result that is an operation result of the gesture, and a display controller that executes a control related to display processing of the display. The display controller acquires the vision area detected by the vision area detector and a display area of the display, determines a positional relationship between the vision area and the display area, and displays the gesture operation result to the operator. The display controller determines a display mode of the gesture operation result based on the positional relationship between the vision area and the display area.

Abstract: An imaging system includes a mirror assembly. An imager is centrally disposed on the mirror assembly and configured to acquire an image of a biometric feature of a vehicle occupant within a field of view of the imager. A first light source is disposed within the mirror assembly and configured to project a ray of light onto a target surface corresponding to an eye of the vehicle occupant. The first light source is spaced from the target surface by a first distance. The first light source is spaced from the imager by a second distance. The ray of light forms an angle of incidence having legs extending from the target surface to the first light source and to the imager, and wherein the first distance and the second distance are operable to define the angle of incidence in the range of 5° to 15°.

Abstract: Various implementations for an automatic system and processes for monitoring the use of personal protective equipment in a work space are provided. The system includes barcodes attached to the personal protective equipment. The operation of the system involves capturing images of the work space and detecting human form objects and barcode objects in the images. The system and processes further involve calculating the probability that a user is wearing all personal protective equipment in accordance with safety rules applicable to the work space. In some implementations, the system and processes may be used to track personal protective equipment and other objects in a work space. Accordingly, the system and processes may be used to prevent or limit the occurrence of accidents, incidents and/or injuries in hazardous work environments.

Abstract: A surveillance apparatus (100) includes a feature value storage apparatus (200) that associates and stores a feature value of a person belonging to the same group, a detection unit (102) that detects an approach of a person not belonging to the same group to the person belonging to the same group within a reference distance by processing a captured image by using the feature value, and an output unit (104) that performs a predetermined output by using a detection result of the detection unit (102).

Abstract: In examples, a relative skin reflectance of a captured image of a subject is quantified. Based on the relative skin reflectance, the captured image is determined as suitable or not suitable for biometric identification. When the captured image is determined not suitable, a remedial capture setting is calculated and provided to an image capturing resource. Another captured image of the subject, captured under the remedial capture setting, is received from the image capturing resource. The relative skin reflectance of the another captured image is quantified and based thereon, there is a determining of whether the another captured image is suitable or is not suitable.

Abstract: A computing system may include a fail-safe learning engine configured to access camera data captured by multiple cameras positioned within an environment during a learning phase, generate training data based on the camera data captured by the multiple cameras, and construct a human detection model using the training data. The computing system may also include a fail-safe trigger engine configured to access camera data captured by the multiple cameras positioned within the environment during an active phase, and the camera data captured during the active phase may include a target object. The fail-trigger engine may further be configured to provide, as an input to the human detection model, the camera data that includes the target object and execute a fail-safe action in the environment responsive to the determination, provided by the human detection model, indicating that the target object is a human.

Abstract: A vehicular interior rearview mirror assembly includes a mirror head accommodating an interior rearview mirror reflective element. The mirror reflective element has a mirror transflector that transmits near infrared light incident thereon, transmits visible light incident thereon and reflects visible light incident thereon. The mirror transflector includes repeating alternating layers of a higher refractive index layer and a lower refractive index layer. A megapixel camera is disposed within the mirror head behind the mirror reflective element and views through the mirror transflector. A near infrared illumination source is disposed within the mirror head and operable to emit near infrared light that passes through the mirror transflector. Responsive at least in part to the data processor processing captured image data, at least one selected from the group consisting of (i) driver attentiveness is monitored, (ii) driver drowsiness is monitored and (iii) driver gaze direction is monitored.

Abstract: Aspects of the disclosure relate to user authentication. A computing platform may validate, after launch of an application, initial authentication credentials and geolocation information for a user of a client device. The computing platform may cause the client device to activate the integrated camera. The computing platform may receive, from the client device, video information indicating multiple viewpoints from perspectives of the client device, and including any individuals within a predetermined distance of the client device. The computing platform may generate faceprints, each corresponding to one of the individuals within the predetermined distance. The computing platform may compare, using an AI engine, the faceprints to stored faceprints of authenticated users. Based on identifying that at least one of the individuals is not authenticated, the computing platform may mask an application user interface for the application.

Abstract: An interaction information estimation method is provided. The method includes the steps of: determining, on the basis of a relationship between a product region and a first person detected in a plurality of video frames, whether contact is made between the first person and a product included in the product region, thereby estimating information on an interaction between the first person and the product on the basis of a result of the determination; and validating the estimated information on the interaction.

Abstract: An example system includes a first camera to capture a first image of a first facial body part and a second camera to capture a second image of a second facial body part. The example system further includes a transformation engine to transform respective scales of the first image and the second image to a scale of full facial images. The example system further includes a local location engine to: identify first facial landmarks and second facial landmarks in respective transformed versions of the first image and the second image, the first facial landmarks and the second facial landmarks used to determine that an action has occurred.

Abstract: An image processing device includes: a light emitting unit that emits a near-infrared ray to a target; a light emission controlling unit that controls a light emission amount of the light emitting unit on a basis of a distance value between the target and the light emitting unit; and a detecting unit that detects a feature point on the basis of a captured image of the target irradiated with the near-infrared ray.

Abstract: A vehicular cabin monitoring system includes an interior rearview mirror assembly configured for attaching at an interior portion of an equipped vehicle and having a having a mirror head accommodating a driver monitoring camera and first and second near infrared light emitters. When the equipped vehicle is a left hand drive vehicle, a beam of light emitted by the first near infrared light emitters is directed toward a driver-side front seating location of the left hand drive vehicle when the first near infrared light emitter emits near infrared light for a driver monitoring function. When the equipped vehicle is a right hand drive vehicle, a beam of light emitted by the second light emitting element is directed toward a driver-side front seating location of the right hand drive vehicle when the second near infrared light emitter emits near infrared light for the driver monitoring function.

Abstract: Techniques for an objection detection feature are described herein. Images of an object captured by a camera may be received along with information that includes a first timestamp. A presence of the object and a type of the object may be determined based on a computer vision model that uses the images. First RFID data may be received from an RFID sensor from an RFID tag associated with the object. The first RFID data may include a second timestamp and an identifier for the RFID tag. A determination that the object has entered the area may be determined based on the presence of the object within the images, the first RFID data, the first timestamp, and the second timestamp. A threshold for the object may be determined based on the first timestamp, the second timestamp, and one or more policies for the area.

Abstract: Disclosed is a method of measuring a physiological parameter in a contactless manner. The method includes acquiring a plurality of image frames for a subject, acquiring a first color channel value, a second color channel value, and a third color channel value for at least one image frame included in the plurality of image frames. The method further includes calculating a first difference and a second difference on the basis of the first color channel value, the second color channel value, and the third color channel value for at least one image frame included in the plurality of image frames. The first difference represents a difference between the first color channel value and the second color channel value for the same image frame, and the second difference represents a difference between the first color channel value and the third color channel value for the same image frame.

Abstract: The present disclosure generally relates to a method for authenticating a user using an electronic device, where the electronic device comprises a biometric sensing system as well as a first, a second and a third control unit. The present disclosure also relates to a corresponding electronic device and to a computer program product.

Abstract: The present disclosure relates generally to medical imaging, and more specifically to enhancing medical images (e.g., images taken in low-light conditions) using machine-learning techniques. An exemplary method of obtaining an enhanced fluorescence medical image of a subject comprises: receiving a fluorescence medical image of the subject (e.g., NIR images); providing the fluorescence medical image to a generator of a trained generative adversarial network (GAN) model trained using a plurality of white light images; and obtaining, from the generator, the enhanced fluorescence medical image of the subject.

Abstract: Embodiments of the present application provide a method for fingerprint identification, and electronic device. The method includes: acquiring a first image collected by a fingerprint sensor at a first exposure time; determining whether to acquire a second image collected by the fingerprint sensor at a second exposure time according to the first image, where the second exposure time is continuous with the first exposure time, and a length of the second exposure time is greater than or equal to a length of the first exposure time; performing fingerprint identification according to the first image, or, the first image and the second image. The method, and electronic device of the embodiments of the present application can take into account an unlocking rate and unlocking time, thereby improving unlocking experience of a user.

Abstract: A gateway-based situation monitoring system, includes: a plurality of edge sensor terminals each installed in a specific place, connected according to at least one wireless communication scheme, and collecting life signals generated in the specific place as monitoring information; a gateway terminal selectively connected to the plurality of edge sensor terminals according to the at least one wireless communication scheme, receiving the life signal, and transmitting the received life signal to a cloud server; and a cloud server detecting the occurrence of an abnormal situation while monitoring the specific space by analyzing the life signal received from the gateway terminal.

Abstract: An overhead lighting system is set forth comprising a master module having a sensor for measuring distance to an area of interest, and at least one peripheral module pivotally connected to the master module, the at least one peripheral module having at least one lamp and a mechanism for pivoting the at least one peripheral module to an angle relative to the master module based on the distance to the area of interest, for focusing the at least one lamp on the area of interest.

Abstract: In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, characteristics of multipath reflection signals of the ultrasonic sensor are accessed, wherein the characteristics of the multipath reflection signals include a relationship of primary signal contributions to multipath reflection signal contributions for acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. Acoustic signals are received at the ultrasonic sensor over a time of flight range while a target is interacting with the ultrasonic sensor, wherein the acoustic signals include a primary signal contribution and a multipath reflection signal contribution. The characteristics of the multipath reflection signals are compared to received acoustic signals.

Abstract: Systems and methods for visualizing fluid flows in a virtual reality (VR) environment are disclosed. A digital volume image representing a reservoir formation sample is obtained from an imaging device. The digital volume is segmented by assigning hydraulic properties of the formation sample to each volume element based on image properties associated with that volume element. Fluid flow is simulated using the segmented digital volume. A vector field representing flow properties at different points along one or more flow lines through the pore space is generated. An interactive visualization of a three-dimensional (3D) virtual environment representing the formation sample with the flow line(s) is provided via a VR display. Responsive to receiving user input specifying an area of the environment to view at a selected level of detail, the specified area is rendered at the selected level of detail and a current view of the interactive visualization is updated accordingly.

Abstract: An electronic device may include: a display device; a battery; a digitizer positioned between at least the display device and the battery and including a first circuit board; a fingerprint sensor including a second circuit board and a third circuit board; and a processor electrically connected to the display device, the digitizer, and the fingerprint sensor. The first circuit board may include a first conductive pattern for recognizing an input device, the second circuit board may include a second conductive pattern for recognizing the input device, the third circuit board may include a third conductive pattern for recognizing a fingerprint, and the first conductive pattern and the second conductive pattern may be electrically connected. Various other embodiments that can be recognized through the specification are also possible.

Abstract: This application relates to teaching applications of virtual reality technology, and provides a three-dimensional (3D) integrated teaching field system based on a flipped platform and a method for operating the same. The system includes a device deployment module, a teaching resource matching module, an acquisition and processing module and an edge computing module. The method includes spatial division of the 3D comprehensive teaching field system in an offline classroom, device deployment, edge computing, holographic display, data acquisition, motion positioning, and construction of a teaching interactive environment.

Abstract: A method for 3D imaging of a sample, in a vessel having a longitudinal axis orthogonal to a horizontal plane, includes capturing, by at least three cameras located at different positions around the vessel, respective 2D images of the sample. Each image comprises pixels having associated pixel values. The optical axis of a first camera is inclined or declined at a first angle relative to the horizontal plane, with the first angle being greater than or equal to zero degrees. The optical axis of a second camera is inclined or declined at a second, larger angle relative to the horizontal plane. The method also includes generating a 3D image of the sample based on the pixel values associated with the 2D image pixels, and one or more look-up tables that collectively indicate, for pixels in each image, expected paths for light traversing the vessel and the sample.

Abstract: A visual sensor having a light sensitive element and a processor, the processor being adapted to recognize whether a cap is on or off the light sensitive element by recognizing a unique identification pattern coded into the light sensitive element.

Abstract: A vehicular interior rearview mirror assembly includes a mirror head accommodating an interior mirror reflective element. The mirror reflective element has a mirror transflector that transmits near infrared light incident thereon, transmits visible light incident thereon and reflects visible light incident thereon. A camera is disposed within the mirror head and views through the mirror transflector. The camera includes an imaging sensor having a quantum efficiency (QE) of at least 15% for near infrared light having a wavelength of 940 nm. First, second and third near infrared illumination sources are disposed within the mirror head and operable to emit near infrared light that passes through the mirror transflector. The near infrared illumination sources are at respective locations at the mirror reflective element and, when powered, illuminate respective seat regions for a driver-monitoring function or an occupant-detection function.

Abstract: A system is used to excite an object at a vibration frequency, in order to induce stationary or travelling waves having the vibration frequency on the surface of the object. An optical interferometer is configured to use optical interference to determine vibration amplitude and phase data of the stationary or travelling wave at each of a plurality of points on the surface, relative to a reference phase. A processing system is used to apply a spatial derivative filter to the vibration phase data, and the resulting spatial-derivative-of-phase data is processed to determine a property of the object, and is further processed to generate graphical-representation data for outputting on a display device.

Abstract: An optical filter array is used in a photodetection device that generates image data separately for each of N (where N is an integer greater than or equal to 4) wavelength bands. The optical filter array includes a plurality of optical filters. The plurality of optical filters include plural types of optical filters differing in transmittance from each other in each of the N wavelength bands. Assuming that pi is an average of transmittances of the plurality of optical filters for light in an ith wavelength band (where i is an integer greater than or equal to 1 and less than or equal to N) of the N wavelength bands, a standard deviation of the average ?i of the transmittances for the N wavelength bands is less than or equal to 0.13.

Abstract: A room device comprising two or more connectors (2a, 2b, 15) for providing building power to the room device (1); a device controller (3a) configured to operate a heating, ventilation and/or air-conditioning system (4); a device memory (3b) in operative communication with the device controller (3a); wherein the device memory (3b) and the device controller (3a) require building power for standard operation; a transponder controller (5a) and an antenna (5c); a transponder memory (5b) being powerable by the transponder controller (5a); a device firmware stored in the device memory (3b), the device firmware including instructions causing the device controller (3a) upon providing building power to the room device (1) to: connect to the transponder controller (5a) such that the device controller (3a) is in operative communication with the transponder controller (5a); transfer the initial configuration data stored in the transponder memory (5b) to the device memory (3b).

Abstract: A surgical monitoring system including a machine vision sensor, an electronic controller communicatively coupled to the machine vision sensor, the electronic controller including a processor and a memory storing a computer readable instruction set, where, when the computer readable instruction set is executed by the processor, the electronic controller, detects a position of a subject with the machine vision sensor, detects a position of a person support apparatus, compares the detected position of the subject with the detected position of the person support apparatus, and determines if the detected position of the subject and the detected position of the person support apparatus indicates that the subject is not aligned with the person support apparatus.

Abstract: Devices, systems, and methods for monitoring musculoskeletal (MSK) health conditions of an individual, including joint flexibility, strength, and endurance as part of their overall care plan are described here. The overall system includes: a sensor that can be worn anywhere on the human body, an engaging app on a mobile-computing device, and software-based analytics and care management engine running on a cloud-computing infrastructure. The sensor is tuned to measure any human joint movement in any direction or axis as well as elevation and temperature. Methods performed by the various devices and systems and how it improves MSK health are provided.

Abstract: Object overlay for vehicle occupants includes determining that visibility of an object in a view of a vehicle occupant through a transparent surface of the vehicle is degraded, the object being in an environment in which the vehicle travels, selecting from an image repository a reference image of the object, extracting, from the reference image, an image portion comprising an image of a least a portion of the object, transforming the extracted image portion to correspond to the view of the vehicle occupant, the transforming producing a transformed image portion, and displaying the transformed image portion on the transparent surface and interposed in a line-of-sight of the vehicle occupant to the object in the environment such that the transformed image portion overlays at least a portion of the vehicle occupant's view through the transparent surface to the object in the environment.

Abstract: A user device (e.g., voice assistant device, voice enabled device, smart device, computing device, etc.) may receive/detect audio content (e.g., speech, etc.) that includes a wake word and/or words similar to a wake word. The user device may require a wake word, a portion of the wake word, or words similar to the wake word to be detected prior to interacting with a user. The user device may, based on characteristics of the audio content, determine if the audio content originates from an authorized user. The user device may decrease and/or increase scrutiny applied to wake word detection based on whether audio content originates from an authorized user.

Abstract: Object recognition scanning systems and methods for implementing artificial intelligence based item determination are disclosed herein. Example object recognition scanning systems and methods include imaging, by an imager having a field of view (FOV) extending over a scanning area, one or more items within the FOV, and receiving image data of an item imaged by the imager during a scanning session. A trained object recognition model, taking the image data as input, determines a product identification probability for the item. The object recognition scanning systems and methods include executing one of: (a) a first decoding sequence including, (b) a second decoding sequence, or (c) a mismatch detection sequence.

Abstract: Methods, devices, and systems related to determining biometric data using an array of infrared (IR) illuminators are described. In an example, a method can include projecting a number of IR dots on a user using a dot projector and an array of IR illuminators, capturing an IR image of the number of IR dots using an IR camera, comparing a number of pixels of the captured IR image to a number of corresponding pixels of a baseline IR image using a processing resource, and determining biometric data of the user at least partially based on comparing the captured IR image to the baseline IR image using the processing resource.

Abstract: A system and method to measure blood oxygenation levels and total hemoglobin on individually selected blood vessels, to provide a representation of the subject condition and of tissue perfusion that may be used for diagnosing specific tissue conditions. Reflection spectra from individual blood vessels or a collection of vessels are measured by using wide-field imaging for selecting target vessels and a narrow-field confocal detection system to enable measuring local blood oxygenation and hemoglobin. Optical fibers may be used to illuminate the target vessel and to detect light diffusively reflected therefrom. The reflection spectra may be analyzed in a spectrometer to extract the ratio of the deoxy- to oxyhemoglobin and to determine their absolute concentration for computing total hemoglobin levels. An alternative implementation uses image processing on camera images of a blood vessel, generated at an isosbestic wavelength of the deoxy- and oxyhemoglobin, and optionally also at neighboring wavelengths.

Abstract: A frictionless access control system and method embodying satellite cameras for facial recognition are disclosed. The cameras capture image data of individuals at an access point such as a door. Preferably, two or more cameras are placed on opposite sides of the access point to increase the likelihood that the individuals are captured in the image data. A facial cropper module extracts facial patches from the image data, and a facial signature module computes facial signatures from the facial patches. A facial recognition module receives the computed facial signatures from the facial signature module, matches the computed facial signatures to stored facial signatures, and sends user identity information of individuals corresponding to the stored facial signatures to the facial signature module when the computed facial signatures match the stored facial signatures.