63 results about "Fixation (visual)" patented technology

Alteration of a fixation or peripheral stimulus displayed on a computer-driven display allows a human subject to maintain extended visual fixation upon the resulting dynamic stimulus. The fixation is presented upon the display and the stimulus is altered to allow resensitization of the subject's retina, thereby allowing prolonged visual fixation upon the resulting dynamic target. A dynamic stimulus may utilize a frequency doubling illusion.

The invention belongs to the technical field of holographic images of intelligent glasses, and discloses an intelligent adjusting method for preventing holographic images from blocking sight of near-to-eye display equipment. The intelligent adjusting method comprises the following steps: judging three-dimensional space coordinates of a fixation points of eyeballs; judging the change condition of pupils of human eyes; judging whether a real object exists at the position of the fixation points or not through an artificial intelligence image recognition technology; based on the judgment result, judging whether the user has a watching requirement on an object behind the holographic image or not at the moment; and if the user is paying attention to the object behind the holographic virtual image, controlling the near-eye display equipment to reduce the brightness of the holographic image or turn off the near-eye display equipment by the computer control system, or moving a watching shielding program, wherein when the visual fixation points of the human eyes leave the body of the object or the fixation points returns to the holographic virtual image, the holographic virtual image state (light brightness and position) presented by the optical near-to-eye display equipment recovers to the initial state. For the intelligent adjusting method for preventing holographic images from blocking sight of near-to-eye display equipment, the problem that the light brightness of the holographic image light source interferes with real object observation of a user is solved.

The invention relates to a wearable visual fixation target positioning device and method, the hardware portion includes a shoulder support bracket, Rotating shaft and angle sensor, Neck rotating clasp, vision sensor, microprocessor, for data reception and processing, the device was placed on the subject, First, the angular orientation of the head and neck position is obtained, so that that visualgaze direction is obtain, Synchronize the vision sensor with the visual orientation by turning the snap ring around the neck. so that the vision sensor is synchronized with the front-view direction ofthe person, Two-dimensional machine vision positioning technology and depth information are used to determine the spatial position of the object in the gaze field, and the position information of theobject is obtained through coordinate transformation and visual gaze orientation information fusion, and then the three-dimensional information is converted to the required application coordinates. The device can be used for realizing the visual active selection target of human-machine mixing and determining the spatial coordinate position of the target relative to the body.

A prism prescription value acquisition system that includes a calculation part for numerically transforming a fixation disparity amount (unit: angle), which indicates a degree at which the visual axis is shifted from the central fovea of the retina when a subject conducts visual fixation of a target, into a prism prescription value by multiplying the fixation disparity amount by a coefficient when the fixation disparity amount is within ±4 minutes. Herein, the prism prescription value is calculated according to the following equation: AP_ver=k_ver*FD_ver, AP_hor=k_hor*FD_hor providing that each of coefficients k_hor and k_ver satisfies the following conditions: 0.3≦k_ver≦0.7, 1.4≦k_hor≦2.0.

The invention discloses a virtual reality system space positioning method based on depth perception. The method comprises the steps that firstly, a fixation point perceived by a human vision system istracked through a sight tracking system integrated with VR head-mounted equipment, and a depth perception model when a user fixes at a target object in a virtual environment is constructed based on the fixation point; secondly, an internal reference matrix relative to visual perception is established according to the gaze point so as to calculate the 2D projection positions of the 3D fixation points on the image and calculate the position of the target point gazed by human eyes accordingly; then the depth perception difference set by the VR system and formed the visual system is quantified; and finally the position of the virtual camera is compensated according to the depth perception difference to obtain the position of the virtual camera in the virtual space perceived by the visual system. The deep perception difference of the visual system in the virtual environment is considered, and the perception position of the user in the virtual scene is directly positioned so that the user can interact with the virtual object more accurately, and the interaction experience of the user is improved.

The embodiment of the invention discloses an eyeball tracking method combined with head motion detection and a related device. The eyeball tracking method is used for improving the tracking judgment precision of a terminal on eyeball fixation points of a user. The embodiment of the method comprises the steps that when a terminal detects that a user is watching a screen, the terminal extracts eyeball feature information of the user through an eyeball tracking technology, and coordinates of a watching point are obtained through calculation; the terminal displays a visual feedback identifier on the screen, wherein the visual feedback identifier is used for prompting a user that the fixation point is located in an area; when the terminal detects that the fixation point is not in the target area, the terminal sets a head movement range by taking a preset value as a radius; the terminal detects head movement information of a user within the head movement range; and the terminal judges the head movement condition according to the head movement information, and corrects the fixation point coordinates and the visual feedback identifier according to the head movement condition.

The embodiment of the invention provides a determination method of emotion processing tendency and a related product. The method comprises the steps that visual stimulation is presented, wherein the visual stimulation comprises positive emotion stimulation and negative emotion stimulation at the same time; a fixation point of eyes of a test target within a first time threshold value after the testtarget receives the visual stimulation and fixation duration of the fixation point are acquired; and the emotion processing tendency of the test target is determined according to the fixation point and the fixation duration. According to the method and the product, a stimulation paradigm presented by the positive emotion stimulation and the negative emotion stimulation at the same time is combined with an eye movement tracking technology, therefore, the emotion processing tendency of an individual can be objectively and accurately determined, and the efficiency of determining the emotion processing tendency of the individual is improved.

The invention provides a shading plate assembly, a control method and a control device thereof and a vehicle, which relate to the technical field of shading, and can avoid the problems of darkening ofan exterior scene and worsening of a visual field while solving the problem of visual dizziness of human eyes caused by direct sunlight in the driving process of the vehicle. An image acquisition module in the shading plate assembly is used for acquiring image information of a transparent panel and human eyes; a control module is used for determining target position information of fixation pointsof human eyes positioned on the transparent panel according to the image information, and determining a target control area, corresponding to the target position information, on the transparent panel; a detection module is used for detecting corresponding optical information when light penetrates through the target control area and is emitted to human eyes; and the control module is also used foradjusting the light transmission degree of the transparent panel in the target control area according to the optical information, so that the optical information is within a preset range. The shadingplate assembly provided by the invention is used for shading.

The invention discloses a brain-computer interface method based on steady-state asymmetric visual evoked potentials, and the method comprises the steps: constructing an SSaVEP coding normal form withN instruction sets, enabling a visual field fixation point to be at an original point, and enabling a visual stimulation signal to appear around the original point in two different time periods; acquiring electroencephalogram signal data of a subject by using a Neuroscan Synamps2 system, and performing preprocessing to extract a feature signal; constructing a spatial filter, and respectively obtaining a training set template and a test set template by utilizing the spatial filter to realize feature enhancement of the SSaVEP; extracting correlation coefficients of the training set template andthe test set template by using a CCA algorithm to maximize the potential correlation. In mode matching, the relationship between the training set template and the test signal is represented by a vector, a final correlation coefficient decision value is further obtained, and a target category is obtained based on the decision value. According to the technology, the signal-to-noise ratio of SSVEP can be remarkably improved, and the technology is suitable for a low frequency band, a medium frequency band and a high frequency band; and meanwhile, visual fatigue can be reduced by utilizing a hiddenvisual fixation mode.

The invention discloses a device for reducing a visual detection misjudgment rate of an aluminum profile. The device comprises a conveying belt, an angle unit, a rotating unit and a lifting unit, the conveying belt is longitudinally and horizontally arranged; the angle unit comprises arc-shaped plates, sliding rails, sliding blocks, supporting columns and cameras, the two transverse arc-shaped plates are arranged above the conveying belt, the sliding blocks are slidably connected with the sliding rails, and the lower ends of the supporting columns are fixedly connected with the middles of the upper ends of the cameras; the rotating units are mounted on the left and right sides of the arc-shaped plate; the lifting units are installed on the left and right sides of the arc-shaped plate. The arc-shaped plate is arranged to support the camera, so that products can be detected in all directions and angles, the same distance of detection of the products can be ensured, the application range is wide, different arc-shaped plates can be replaced according to different products through the installation assembly, convenience and rapidness are achieved, in addition, the sliding assembly is arranged to facilitate movement and fixation of the camera, and the practicability is high. And a rotating disc and wheels are further arranged, so that the equipment is convenient to move.

The invention discloses a visual fatigue measurement method as well as a system, a storage medium and an electronic device thereof. The visual fatigue measurement method comprises the following steps:acquiring eye movement parameters of the eyes, wherein the eye movement parameters include one or more selected from fixation frequency and scanning range; and then, obtaining fatigue degree of the eyes on basis of the eye movement parameters. For the fatigue degree is obtained by adopting the fixation frequency and the scanning range as the eye movement parameters, the visual fatigue measurementmethod is reliable in measurement result; and thus, the visual fatigue measurement method is capable of accurately determining fatigue degree of a user.

The invention belongs to the technical field of application of near-to-eye display equipment, and discloses a method for enhancing the visual ability of human eyes based on MR glasses, a system and equipment. The method comprises activating a telescopic mode according to the visual demand of a user, and capturing a long-distance scene in the front of the visual field of the user through a telephoto camera of the equipment; and after optimization or/and AI image enhancement are/is carried out on the image of an magnified fixation area, presenting the image to the user, so that the user can see the distant scene beyond the visual ability range clearly, and the visual ability of the user in looking at the distance is enhanced. The optical structure of a front camera on the existing MR glasses is improved by utilizing a light guide optical fiber, an optical waveguide or a periscope technology, so that the whole MR glasses are lighter and thinner. An eye movement tracking device and a head movement tracking device are used for selecting the focusing area of the image, the magnification power is determined through eye movement interaction and/or gesture interaction, a MR glasses display previews the photographing area in real time, and finally a picture is taken.

The invention relates to the technical field of computer visualization, in particular to a heat map generation method based on eye jump information, which comprises the following steps: S1, inputtingan original fixation point; S2, preprocessing the fixation point data to remove error data; S3, carrying out merging operation on the preprocessed fixation points; S4, converting the combined fixationpoint parameterization processing into eye jump type data; S5, generating an effective heat map from the parameterized fixation points; According to the invention, a mixed data structure of fixationpoints and eye skips is used, and a heat map deformation method for eye skips type data is added. The heat map generated by using the method provided by the invention has a good function of indicatingthe transfer path of the gaze area on the basis of keeping the original function of displaying the gaze area, and has strong creativity.

The invention discloses a method for evaluating visual distribution of a pilot by adopting visual tracking equipment. The method is established based on an eye movement measurement index (glancing track length) in a search process and an eye movement index (fixation time percentage/fixation number percentage) in a processing process. The method comprises the following steps: firstly, decomposing a flight mission into a plurality of typical stages, and then, confirming weight degrees of an attention search process and an attention information processing process and the weight of each typical stage through subjective questionnaire survey; and then, collecting eye movement data of both eyes of a tested pilot and an excellent pilot through SMI glasses type visual tracking equipment, recording an experimental scene in real time through a scene video recorder, playing back a scene video to obtain attention interest areas and sight change data of the tested pilot and the excellent pilot, carrying out data analysis and calculation to obtain correlation between the eye movement data of the tested flight trainee and the excellent pilot, and finally presenting an evaluation grade of attention distribution of the tested pilot.