199 results about "Saccadic eye movement" patented technology

A system, apparatus, method, and machine readable medium are described for performing eye tracking during authentication. For example, one embodiment of a method comprises: receiving a request to authenticate a user; presenting one or more screen layouts to the user; capturing a sequence of images which include the user's eyes as the one or more screen layouts are displayed; and (a) performing eye movement detection across the sequence of images to identify a correlation between motion of the user's eyes as the one or more screen layouts are presented and an expected motion of the user's eyes as the one or more screen layouts are presented and/or (b) measuring the eye's pupil size to identify a correlation between the effective light intensity of the screen and its effect on the user's eye pupil size; capturing audio of the user's voice; and performing voice recognition techniques to determine a correlation between the captured audio of the user's voice and one or more voice prints.

The presently disclosed invention is a device for measuring horizontal and vertical eye movement. The device is adaptable to utilize multiple measurement technologies (e.g., direct infrared, electro-oculography, ultrasound, or video), and is capable of measuring each eye individually or both eyes jointly. The present invention overcomes the shortcomings of the prior art by requiring minimal adjustment for accurate measurement, only minimally obstructing the user's visual range (i.e., slightly more than the user's own nose), being made of low cost and readily available material, and by being comprised of a comfortable and efficient design of an adjustable nose and forehead piece with an adjustable head strap. An additional advancement over the prior art is that the presently disclosed device does not require an aperture or frame, as did the prior art, or any additional optics such as, lenses, mirrors, or prisms. The device rests on the user's nose with the sensors located near the nasal area of the eye(s) utilizing a nose bridge component to house the measuring technology. The forehead piece and head strap provide for ease of alignment, added stability, and a wide range of test applications. The greater field of vision provided by this device allows for a wide range of test applications.

An alertness monitoring system includes: means to measure velocity and amplitude of eyelid and eye movement; and storage means to continuously record the measurements. A data processor calculates the blink amplitude to velocity ratio and/or the saccade amplitude to velocity ratio and compares the measurements against a predetermined scale. The scale is derived from averaged measurements of the eye and eyelid movement parameters for a sample population measured against predetermined incremental blood alcohol levels. The output of the system can include a display for showing the alertness measurement based on the scale, or an alarm means triggered by the scale reading reaching a predetermined limit based an the blood alcohol level scale.

A laser-based method and apparatus for corneal surgery. The present invention is intended to be applied primarily to ablate organic materials, and human cornea in particular. The invention uses a laser source which has the characteristics of providing a shallow ablation depth (0.2 microns or less per laser pulse), and a low ablation energy density threshold (less than or equal to about 10 mJ/cm.sup.2), to achieve optically smooth ablated corneal surfaces. The preferred laser includes a laser emitting approximately 100-50,000 laser pulses per second, with a wavelength of about 198-300 nm and a pulse duration of about 1-5,000 picoseconds. Each laser pulse is directed by a highly controllable laser scanning system. Described is a method of distributing laser pulses and the energy deposited on a target surface such that surface roughness is controlled within a specific range. Included is a laser beam intensity monitor and a beam intensity adjustment means, such that constant energy level is maintained throughout an operation. Eye movement during an operation is corrected for by a corresponding compensation in the location of the surgical beam. Beam operation is terminated if the laser parameters or the eye positioning is outside of a predetermined tolerable range. The surgical system can be used to perform surgical procedures including removal of corneal scar, making incisions, cornea transplants, and to correct myopia, hyperopia, astigmatism, and other corneal surface profile defects.

The object at which a user is gazing Is accurately determined from among objects displayed on a screen. A gaze target determination device (10) includes: an event setting unit (13) which generates, for each object at different times, a display event which triggers a movement of the gaze direction of the user who is gazing at the object and which indicates a movement or a change of the object; a gaze trajectory calculation unit (12) which calculates a gaze trajectory based on the detected user's gaze direction; an eye movement event detection unit (14) which detects event detection time which is time at which the gaze direction moves according to the display event, based on the calculated gaze trajectory; a synchronization structure analysis unit (15) which calculates, for each object, time difference between the event detection time and event occurrence time; and a gaze target determination unit (16) which determines the object at which the user is gazing from among the objects, based on the calculated time difference.

A head worn device for monitoring alertness and attention which includes a) sensors to monitor eyelid and eye movement, b) a motion sensor and c) data storage means for storing data from said sensors. The motion sensor is an accelerometer to provide data that allows the head position to be analysed and to determine the direction of gaze. The device collects data from an accelerometer worn by the driver to detect if the vehicle is in motion and whether the head is tilted vertical plane. If the vehicle is not in motion data is not processed. When the direction of gaze is downward sensor signals from the eye movement sensors is ignored. However if the duration of downward gaze is greater than a predetermined minimum period and the vehicle is in motion, an alarm is triggered because the driver is inattentive. The device may be used to assess whether workers are sufficiently alert before they commence work. The method of measuring a subjects fitness for a particular task uses the alertness monitor or a video camera to monitor eye and eyelid movement with or without head movement data while the subject is tested with a series of tests that require the subject to follow predetermined images or lights. If the subject is unable to satisfactorily track the images the subject is not fit for work.

A method of measuring and analyzing an ocular response in a subject comprising the steps of: Providing a video oculography based system for the subject with the system configured to collect eye images in excess of 60 hz and configured to resolve eye movements smaller than at least 3 degrees of motion; Collecting eye data with the video oculography based system wherein at least one stimulus is presented to only one eye of the subject and configured to yield a pupil eye response from at least one eye of the subject; Calculating pupilometry measurements from the eye data, wherein the pupil measurements are calculated independently for the subject's left and right eyes for each stimulus presented to the subject, and wherein comparative left and right pupilometry measurements from the eye data are calculated; analyzing a subject's ocular response based upon at least one of the calculated pupilometry measurements.

A method for designing ophthalmic lenses, including progressive addition lenses, and lenses produced by the method are provided. The method permits the direct correlation of an individual's subjective assessment of the lens' performance and the objective measure of lens performance relative to the individual. The method permits generation of lens designs based on the head and eye movement of the individual and the designing of customized lenses.

The present invention generally relates to a method for improving the reliability of a portion of physiological data from an image sensor monitoring an operator positioned in an operator compartment of a vehicle. An embodiment of the method includes receiving, from the image sensor, physiological data including information relating to at least one of eye, face, head, arms and body motion of the operator, identifying an indication of at least an eyelid closure, eye movement or head movement of the operator based on the physiological data; comparing at least one of the physiological data and a lighting condition within the operator compartment with a set of rules for a current operator status; and classifying the type of eyelid closure, eye movement and/or head movement by correlating the identified eyelid closure, eye movement and/or head movement and a result of the comparison.

A vehicle's driving personality is adapted to a driver by determining a driver's ability to operate the vehicle by monitoring the driver's operation. The driver's operation, such as vehicle speed, lane usage, and braking, is compared to known characteristics of the road segment on which the vehicle is being driven. The driver's competency is evaluated by comparing how the driver operates a vehicle on a segment of roadway to how the vehicle could be operated and stay within limits imposed by law. A driver's ability to operate the vehicle can also be obtained from sensors that monitor a driver's heart rate, respiration rate, eye movement, and other health-indicating autonomic responses. After the driver's capabilities are determined, navigation instructions provided to the driver thereafter are modified to route the driver over roads that are either preferred or appropriate for the driver's physical abilities.

A method and apparatus for measuring drowsiness particularly in vehicle operators measures the amplitude to velocity ratio for eyelids closing and opening during blinking as well as measuring duration of opening and closing. The average values for the amplitude to velocity ratios for opening and closing are weighted and added to give a drowsiness measure that is compared to a scale of drowsiness based on data collected from alert and drowsy subjects. Other eye movements can be used in the weighted algorithm. The scale of drowsiness predicts the onset of drowsiness levels that render an operator unfit to continue.

The application provides a liveness detection method capable of implementing liveness detection on a human body, and a liveness detection system that employs the liveness detection method. The liveness detection method comprises: obtaining video data acquired via a video acquisition module; determining, based on the video data, a feature signal of an object to be detected; judging whether the feature signal meets a first predetermined condition, and if the feature signal meets the first predetermined condition, identifying that the object to be detected is a living body, wherein the feature signal is indicative of eye movement of the object to be detected.

A method of analyzing and practicing golf strokes, such as putting strokes, is provided. A surface is provided, wherein a golfer can practice one or more strokes in an environment simulating components of a golf course, such as a green. A club movement detector embedded in the surface and comprising a plurality of photodetectors and associated circuitry determines the position and velocity of the club face A head movement sensor detects rotational movement of the golfer's head during the golf stroke. An eye movement sensor detects movement of the eyes of the golfer during the golf stroke. A processor connected to the club movement sensor, eye movement sensor, and head movements sensor gathers movement data during the golf stroke and produces measurements corresponding to the golf stroke, such as eye, head, and club movement of the golfer. The invention includes measuring head movement data and wirelessly transmitting same for remote analysis during a golf stroke. Club head movement is sensed by an infrared ranger placed along a line perpendicular to the face of the clubhead. Eye, head, and club movement data can be combined into one or more serialized data streams, and transmitted wirelessly over one or more RF channels for remote reception and processing. Finger, wrist, and elbow movements can also be measured and analyzed during a golf stroke or a free throw setting.

The invention discloses an imaging system and method for guiding eyeballs to trace virtual reality. The system comprises eyeball scanners, eyelid tracing devices, a receiving module, a processing module, a display device and a helmet, and the eyeball scanners are used for obtaining eyeball iris and/or retina information; the eyelid tracing devices are used for obtaining eyelid motion form information of a person; the receiving module is used for receiving the eyeball iris and/or retina information sent by the eyeball scanners and the eyelid motion form information sent by the eyelid tracing devices; the processing module is used for analyzing, comparing and processing the eyeball iris and/or retina information and the eyelid motion form information received by the receiving module and judging motion status of the eyeballs; the display device is used for displaying corresponding image information according to the motion status of the eyeballs judged by the processing module. An imaging method for guiding the eyeballs to trace the virtual reality is further disclosed. By means of the system and the method, the effect of enabling an image seen by the eyes of the person to be clearer in a virtual reality system is achieved.

A sight line detector that accurately calculates calibration parameters in a short time to detect sight line coordinates of a person being photographed on the input image from an imaging section mounted on the head of the person being photographed. A sight line detector (100) detects sight line coordinates of a user on the input image from an imaging section (104) mounted on the head of the user.The sight line detector (100) has an ocular movement detection section (101) to detect the ocular movement of the user, a calibration object detection section (105) that acquires the input image to determine whether or not an object available as a calibration object is included on the acquired input image, and that outputs position coordinates indicating a position the object when it is determinedthat such an object is included, an audio instruction section (108) that instructs the user to see the calibration object indicated by the position coordinates, a calibration parameter calculation section (106) to calculate the calibration parameters using the information on the ocular movement of the user receiving the instruction and the position coordinates of the calibration object, and a calibration section (102) to calibrate the information on the ocular movement to the sight line coordinates using the calculated calibration parameters.

In an embodiment, a control device configures session parameters (e.g., related to an audio component, a video component, an eye tracking component, etc.) for a coordinated display session. The control devices maps, for proximate client devices registered as presentation devices for the coordinated display session, a different portion of visual data for the coordinated display session to respective display screens, and delivers the mapped portions of the visual data to the proximate client devices for presentation by the respective display screens during the coordinated display session. The control device obtains eye movement monitoring feedback from a set of eye tracking devices, the eye movement monitoring feedback characterizing eye movements of a viewing population of the coordinated display session. The control device modifies the session parameters associated with the coordinated display session based on the eye movement monitoring feedback.

A head-mounted visual field inspector is characterized by comprising a housing, a control chip, a closed patch and two aspherical convex lenses, wherein an interpupillary distance adjusting shifting rod is arranged on the lower part of the housing and used for adjusting the distance between the two aspherical convex lenses to adapt to the interpupillary distance of a subject; an eye movement monitor and an infrared shooting device which are connected to the control chip are arranged beside each aspherical convex lens and used for monitoring the eye movement; an LED screen is arranged in front of the two aspherical convex lenses and used for providing background light, fixation points and required stimulation points of different directions and different degrees of luminance in the inspection process for inspecting the visual field of the subject; and a perception feedback device is connected with the control chip by a wire and used for feeding back the perception result of the subject for bright spots on the LED screen. The head-mounted visual field inspector can rapidly detect the visual field of the subject, and is capable of reducing the visual field detection result errors caused by the eye movement, so that the screening of visual field for massive population or home follow-up for patients with visual field injury becomes very convenient.

An eyeball motion monitoring system based on virtual reality comprises a virtual image display module and an eyeball motion track image collection module, wherein the virtual image display module comprises a virtual imaging eye lens device and an imaging positioning module; and the eyeball motion track image collection module comprises a pupil positioning and processing module, an eyeball deflection angle mapping and computation module and a data collection module. The system provided by the invention has the advantages that through combined utilization of a virtual imaging eye lens and computer software, external interference to detection courses can be reduced; dynamic vision detection is standardized; reliable eyeball motion characteristic data can be obtained; and a scientific basis can be provided for subsequent dynamic vision characteristic evaluation.

An embodiment of the invention provides a sight positioning device. The device comprises at least four cameras, an image processing device, and an iris three-dimensional reconstruction device. At least two of the at least four cameras are used for separately taking eyeball motion photos of a left eye at different angles in real time, and at least two of the at least four cameras are used for separately taking eyeball motion photos of a right eye at different angles in real time. The at least four cameras take photos synchronously. The image processing device is used for determining a pupil position and an iris edge in each eyeball motion photo. The iris three-dimensional reconstruction device reconstructs according to the positions of the at least two cameras photographing the left eye and the pupil position and iris edge of the left eye in the eyeball motion photos taken by the at least two cameras so as to obtain a three-dimensional left eye iris edge, determines the central point and sight direction of the left eye iris in the three-dimensional space, and determines the central point and sight direction of the right eye iris in the three-dimensional space. In world coordinates, the sight positioning device determines the focus of the sight direction of the left eye iris and the sight direction of the right eye iris to be a sight focus. The sight positioning device can realize high precision sight positioning.

The embodiment of the invention discloses an eye fatigue detection method, a device and a user device. The method comprises steps of when detecting that a user stare at a display screen of the user device, acquiring eyeball motion parameters of the user; carrying out weighting summation on the eyeball motion parameters to acquire a weighted sum value and determining the weighted sum value to be the fatigue degree of the eyes of the user; and judging whether the fatigue degree is higher than a preset threshold value, and if yes, determining that the eyes of the user are in the fatigue state. According to the invention, fatigue state detection can be performed on eyes of the user.

The invention discloses a living body detection method utilizing eye tracing, and aims to solve the technical problem that whether a detected object is a true living body can not be judged accurately due to the fact that a detected person can use methods such as a photo, a video, a waxwork image to cheat a human face detection system in current face recognition and tracing application. The detected object is asked to use eye movement to trace the dynamic moving locus of a randomly selected object at real time in the living body detection method utilizing eye tracing, according to the collected eye image in eye real-time tracing process, the eye movement locus of the detected object is obtained, the obtained eye movement locus is compared with the pre-designed dynamic moving locus of the randomly selected object, so that the authenticity of the human face living body is judged and recognized. The living body detection method utilizing eye tracing has the advantages of being simple, easy to operate and effective. The detected object is asked to use eye movement to trace the pre-designed dynamic moving locus of the supplied random object at real time to recognize the authenticity of the human face living body of the detected object, and accordingly the technical problem that the detected person use the photo, the video, the waxwork image and the like to cheat the human face detection system is effectively resloved.