287 results about "Visual axis" patented technology

A line-of-sight direction tracking method includes: providing corneal reflection for an eye of a user by using a plurality of light sources, and capturing images including a face of the user by using a plurality of cameras; determining coordinates of a light source reflection point and coordinates of a pupil center in a world coordinate system by means of a human eye feature set acquired from the images including the face, based on hardware calibration parameters; determining a line-of-sight optical axis according to the coordinates of the light source reflection point and the coordinates of the pupil center, and reconstructing, based on the line-of-sight optical axis, a line-of-sight visual axis by means of a compensation angle; and determining a point of sight on a target object according to the line-of-sight visual axis and a position of the target object in the world coordinate system.

The invention belongs to the technical field of space remote sensing surveying and mapping, and particularly relates to a monitoring system and method for a front and rear view visual axis included angle and absolute direction of a surveying and mapping camera. The method comprises the following steps: S1, through side sway of a satellite platform, taking a time for sky imaging calibration as a reference time; s2, calculating a rotation matrix from a front and rear view ground camera measurement coordinate system to a star camera coordinate system at a reference moment; s3, calculating respective thermal deformation matrixes of the star camera coordinate system, the front-view camera measurement coordinate system and the rear-view camera measurement coordinate system; s4, obtaining a real-time rotation matrix from the measurement coordinate system of the front-view camera to the coordinate system of the star camera and a real-time rotation matrix from the measurement coordinate system of the rear-view camera to the coordinate system of the star camera at the measurement moment; and S5, carrying out arc cosine calculation on the two absolute pointing vectors to obtain a visual axis included angle between the front-view camera and the rear-view camera at the measurement moment. According to the invention, while the geometric accuracy of the surveying and mapping camera is ensured, the real-time performance of measurement and the comprehensiveness of subsystem monitoring are realized at the same time.

The invention relates to a method for the automated operation of a device (1) for capturing biometric identification features of a person (2), as well as to a device. The method comprises the following: providing the device (1) with a camera device (4) for capturing a digital biometric facial image and a fingerprint device (13), wherein the camera device (4) for setting a recording position and the fingerprint device (13) for setting a usage position for capturing the fingerprint are adjustable by means of a displacement device (8) at least with regard to a respective height above a reference plane (5) and independently of one another;Moving the camera device (4) by means of the displacement device (8) into a current recording position such that a horizontal viewing axis (6) is formed between the camera device (4) and a person (2) arranged opposite the camera device (4); determining a current height of the camera device (4) above the reference plane (5); providing assignment data which, for a plurality of persons of different sizes, indicate a respective size-adjusted assignment between a reference height of the camera device (4) and an assigned reference position of the fingerprint device (13); determining a reference height corresponding to the current height of the camera device (4) and a reference position of the fingerprint device (13) assigned to this height;Moving the fingerprint device (13) to the assigned reference position and capturing the digital biometric facial image of the person (2) and / or the digital fingerprint of the person (2);

The invention discloses an airborne low-detectability photoelectric long-distance stable tracking and aiming method based on a time-sensitive opposite target, and belongs to the technical field of airborne photoelectric detection and target tracking. The method comprises the following steps: step 1, target detection and miss distance calculation: in a level flight section of an airplane, imaging a target in a field of view, carrying out target detection by adopting an optical flow method, and detecting a moving target by analyzing a motion vector of pixel points in an image sequence; and resolving the deviation amount of the target image relative to the visual axis in real time, namely the target pixel miss distance. 2, designing a stable tracking loop: designing a two-layer control structure for the stable tracking loop, stably inhibiting high-frequency disturbance by a gyroscope of an inner loop, performing tracking correction on low-frequency deviation by an outer loop based on pixel miss distance, and finally realizing high-precision tracking. On the basis of real-time pixel miss distance feedback, a two-layer control structure is designed, the miss distance fed back by an outer ring tracking loop is converted into an inner ring control instruction, and the tracking precision and stability are improved.

The invention belongs to the technical field of automatic control, and particularly relates to a memory tracking method for a two-axis photoelectric holder. The method comprises the following steps: S1, fixing a two-axis photoelectric holder on a carrier; s2, performing stable tracking on the tracking target by adopting a stable tracking mode, and calculating the movement speed # imgabs0 # of the tracking target under the geographic coordinate system; s3, judging whether the tracked target is in a shielded state in the tracking process of the two-axis photoelectric holder, if so, executing the step S4, and otherwise, executing the step S5; s4, the azimuth guide angular rate and the pitching guide angular rate of the two-axis photoelectric holder are solved reversely, and memory tracking of the tracking target is achieved until the visual axis of the two-axis photoelectric holder points to the tracking target again; and S5, judging whether the tracking task continues to be executed or not, if so, executing the step S2, and otherwise, ending the tracking task for the tracking target. According to the invention, memory tracking is carried out when the tracking target is lost, so that the target can be automatically captured and re-tracked when the tracking target appears again.

The invention relates to an eye movement tracking method and device based on adaptive filtering and eye movement equipment, and the method comprises the steps: obtaining an eye movement image of a to-be-tracked eyeball, and calculating a visual axis result of a current frame; performing feature comparison based on the eye movement image, and judging whether the eyeballs to be tracked move or not; when it is determined that the eyeballs to be tracked do not move, a visual axis result subjected to filtering processing is output; and when it is determined that the eyeballs to be tracked move, directly outputting a visual axis result. Through the eyeball tracking method and device, the state of the eyeball to be tracked can be determined through feature comparison, filtering processing is carried out according to the state of the eyeball to be tracked when fixation does not move, and the visual axis result is directly output when glancing moves, so that the problem that the requirements of sight calculation accuracy and quick response cannot be met is solved.

The invention relates to an optical element desensitization method based on thermal stability of a visual axis of a space optical camera, and relates to the technical field of space optical cameras, and the method comprises the following steps: establishing a visual axis stability optical sensitivity matrix; key optical elements are positioned and optimized; analyzing the surface performance of the optical element; and the visual axis error is calculated through complete machine thermal load simulation analysis. According to the optical element desensitization method based on the thermal stability of the optical axis of the space optical camera, the key optical element influencing the stability of the optical axis of the space optical camera is accurately positioned by establishing the linear optical model, targeted optimization is performed, and the efficiency is improved; an optical element influencing the stability of the visual axis is directly subjected to structural optimization, rigid body displacement constraints are integrated in an optimization model, the sensitivity of the optical element to thermal loads is reduced, and the stability of the visual axis of the whole machine is more effectively guaranteed.

The invention relates to the technical field of image processing, and discloses an image motion error processing method, system and device and a medium, and the method comprises the steps: determining a real position and an expected position through the position, corresponding to a selected region in wide-angle imaging, of a long-focus picture in the wide-angle imaging, thereby determining the image motion error of all long-focus regions in the wide-angle imaging; the image motion error is converted into the azimuth angle and the pitch angle of the visual axis under the coordinate system of the two-dimensional pointing mirror, so that the rotation degree required for adjusting the image motion error currently is determined, the image motion error is effectively reduced, image distortion is avoided, complex calculation is not needed, the problem of difficulty in accurate positioning of a visual field expansion system is effectively solved, and the visual field effect is also improved. And fatigue and easy damage are caused by frequent use.

The application discloses a rotating mirror type binocular vision laser tracking light break recovery system and method. The system comprises a rotating mirror type laser tracker and a binocular vision module, two cameras in the binocular vision module are symmetrically installed on both sides of a laser beam, and camera visual axes and a laser optical axis are reflected to a working area through a rotating mirror of the tracker. The method comprises the following steps: a virtual imaging plane model in which the camera visual axes and the laser optical axis are coincident is constructed in advance; after the light break occurs, an infrared illumination light source of a vision system is modulated, frame difference images of modulation wave crests and troughs are acquired and processed, a current position of a target mirror and a predicted light break recovery rotation angle are obtained, and error compensation is performed on the current position and the predicted light break recovery rotation angle; and corresponding motors are driven to rotate according to the compensated light break recovery rotation angle, so that the laser beam is re-aligned to the target mirror. The application reduces the coaxial installation difficulty of a vision system of a rotating mirror type laser tracker, and improves the target mirror recognition rate and the light break recovery servo angle accuracy in a large range of complex environments.

Eyeglasses are disclosed that include eyeglass frames and a pair of ophthalmic lenses mounted in the frames. The lenses include a dot pattern distributed across each lens, the dot pattern including an array of dots spaced apart by a distance of 1 mm or less, each dot having a maximum dimension of 0.3 mm or less, the dot pattern including a clear aperture free of dots having a maximum dimension of more than 1 mm, the clear aperture being aligned with a viewing axis of a wearer of the pair of eyeglasses.

The invention belongs to the technical field of optical adjustment of large-aperture telescopes, and particularly relates to a device and a method for in-situ measurement of optical axis errors of a large-aperture telescope in an external field. The method comprises the following steps: S1, roughly adjusting the four-dimensional adjusting base to enable the auto-collimation light pipe to be aligned with the center of a pitch axis of a to-be-measured piece; s2, rotating the pitch axis of the to-be-measured piece, and adjusting the angle inclination adjusting mechanism to enable the reflecting surface of the plane mirror to be perpendicular to the optical axis of the auto-collimation light pipe, and at the moment, enabling the optical axis of the auto-collimation light pipe to coincide with the pitch axis of the to-be-measured piece; s3, using the to-be-detected piece to track a natural star, when the natural star is located at the center of the detector target surface of the to-be-detected piece, rotating the rotatable pentaprism mechanism to enable the third window to be aligned with the natural star, and enabling the natural star to be imaged on the detector target surface of the auto-collimation light pipe and the detector target surface of the to-be-detected piece at the same time; and S4, calculating a visual axis error of the to-be-measured piece based on the imaging track of the natural star. According to the invention, the process can be simplified, the efficiency can be improved, and the large-aperture telescope optical axis difference can be measured in real time in an out-field on-site manner.

The invention provides a fitting method of a 3D eye model and electronic equipment, and aims to improve the accuracy of the eye model. Comprising the following steps: in response to an eye model fitting instruction, obtaining eye images obtained when eyes of a user watch fixation points at different positions; obtaining eyeball parameters of the user by using the image position coordinates of the pupil center of the user in each eye image and the standard visual axis vector corresponding to each eye image; obtaining a current eyeball rotation angle based on the eyeball parameters of the user and the image position coordinates of the pupil center in the current eye image every specified duration; according to the current eyeball rotation angle and the eyeball parameters, current eyeball model parameters are obtained, and the eyeball model parameters comprise the position vector of the eyeball center, the position vector of the pupil center, the position vector of the curvature center and the visual axis vector; and updating a preset initial eye model by using the current eyeball model parameters of the user to obtain a current 3D eye model of the user.

The invention provides an eye movement tracking method, a control unit and eye movement tracking equipment, and relates to the technical field of eye movement tracking. The method comprises the steps of obtaining a surface image of a target eyeball; extracting composite phase distribution from the surface image, wherein the composite phase distribution represents phase coupling information after the incident light is jointly modulated by a cornea interface and a crystalline lens interface of the target eyeball; based on eyeball geometric constraint and cornea interface smoothness prior, according to the composite phase distribution, constructing a decoupling objective function with separation of cornea phase distribution and crystalline lens phase distribution as a target; taking a minimum decoupling objective function as an optimization objective, and iteratively determining cornea phase distribution decoupled from crystalline lens phase distribution; and determining the visual axis direction of the target eyeball according to the cornea phase distribution. Through the double-interface phase decoupling technology, the visual axis error in a large view field and eyeball depth motion scene is effectively reduced, and the eye movement tracking precision is remarkably improved.

A weapon display device includes a display engine, a waveguide, and a chassis. The display engine is configured to selectively output light. The waveguide is configured to receive the light from the display and output graphics to the user. The chassis is coupled to the display engine and the waveguide, and is further configured to releasably mount to one of a weapon or an optic mounted to the weapon such that a field of view through the waveguide is aligned with an optical axis of the optic.

Systems, methods, and computer program products for displaying virtual contents using a wearable electronic device determine the location of the sighting centers of both eyes of a user wearing the wearable electronic device and estimate an error or precision for these sighting center. A range of operation may be determined for a focal distance or a focal plane at the focal distance based at least in part upon the error or the precision and a criterion pertaining to vergence and accommodation of binocular vision of the virtual contents with the wearable electronic device. A virtual content may be adjusted into an adjusted virtual content for presentation with respect to the focal plane or the focal distance based at least in part upon the range of operation. The adjusted virtual content may be presented to the user with respect to the focal distance or the focal plane.

The invention relates to the technical field of wind turbine generator blade clearance monitoring, and provides a method for measuring wind turbine generator blade clearance through unmanned aerial vehicle machine vision, and an unmanned aerial vehicle carries a machine vision system to fly to a proper position on the side surface of a cabin for picture alignment and then stays; the machine vision system carries out video recording to obtain image data, and carries out real-time clearance calculation according to preset parameters and a blade tower drum identification result; and within continuous time t, when the machine vision measurement optical axis is perpendicular to the symmetry plane of the cabin or the vertical deviation angle is within the vertical deviation angle threshold range, the duration ratio exceeds 80%, and blade clearance measurement is completed. According to the method, the wind turbine generator blade clearance is measured based on unmanned aerial vehicle machine vision, the perpendicularity of a machine vision measurement visual axis and a cabin symmetry plane in the measurement process is judged, and the accuracy and effectiveness of a clearance measurement result are ensured.

The invention provides a line-scan digital camera optical axis thermal stability laboratory calibration method and system, and relates to the field of aerospace and aviation optical remote sensing imaging, and the method comprises the steps: carrying out the imaging of a geometric target collimated by a collimator through a to-be-measured camera, recording the image data of the geometric target and the temperature data of the camera at all moments, and obtaining the thermal stability of the optical axis of a linear array camera according to the characteristics of the geometric target; and determining the coordinates of the mass center position of the geometric target image, calculating the temperature drift amount of the line-scan digital camera optical axis in the along-rail direction and the vertical-rail direction, fitting to obtain the thermal stability coefficients in the two directions, and realizing the laboratory calibration of the thermal stability of the line-scan digital camera optical axis. The method solves the problem that the thermal stability of the optical axis of the linear array camera is difficult to calibrate at high precision in a laboratory, and the calibration precision is at a sub-pixel level. The system is simple in structure and high in adaptability, the static MTF testing function can be expanded, linear array camera optical axis thermal stability laboratory calibration and static MTF testing are carried out at the same time, and the development period is shortened.

The invention relates to an off-axis three-reflector system design method and system based on a vector aberration theory. The method comprises the following steps: determining the focal length of an off-axis three-reflector system; determining the distance between the mirrors and the distance between the three reflectors and the image surface; according to the design requirements of the coaxial three-reflector system, calculating the curvature radiuses and quadric surface coefficients of the three reflectors; calculating the pupil radius of the pupil off-axis front three-reflector system according to the relationship between the pupil radius before and after the pupil off-axis and the pupil eccentric vector, and determining a wave aberration expression of the pupil off-axis rear three-reflector system; based on a paraxial ray tracing method and a vector aberration theory, establishing analytic expressions of a visual axis error, an increased coma error and an increased astigmatic aberration on a primary imaging surface about an inclination amount and an eccentricity amount; by taking optical axis error, coma error minimization and astigmatic aberration minimization as constraint conditions, optimally solving inclination amounts and eccentricity amounts of the three reflectors; structural parameters of the three-mirror system are optimized through optical simulation software. The efficient and reliable design method and system are achieved.

The invention discloses an attitude control method and system for continuously locking a ground target by an unmanned aerial vehicle, and the method comprises the steps: obtaining a target position and an unmanned aerial vehicle attitude data stream, carrying out the coordinate transformation to generate a target attitude relation identifier, and carrying out the deviation vector decomposition to form a visual axis deviation feature set; disassembling the image into a fast and slow response chain through attitude mapping processing, repairing a fracture node, constructing an attitude correction track, extracting a control feature mode, generating a response feature factor, and constructing an attitude compensation constraint matrix; frequency domain decomposition and cross coupling calculation are carried out on the optical axis deviation feature set to determine the coupling correlation degree, and a superposition disturbance sequence is identified and dynamically reconstructed to generate a compensation gain sequence; executing stability evaluation to determine time sequence distribution, identifying abnormal disturbance characteristics and extracting key moment control characteristics; the constraint matrix and the gain sequence are fused to generate a fusion control law, a dynamic priority control coefficient is determined, a target continuous locking attitude control instruction is output, and continuous and stable locking of the moving target is achieved.

The utility model provides a movable carbon flux high-precision monitoring device which comprises a plurality of monitoring groups, and each monitoring group comprises a first supporting assembly, a second supporting assembly, a driving assembly and a detection assembly, the detection assembly is provided with a first sensor, a second sensor, a data acquisition module, an adjusting table, a visual axis stabilizer, a data transmission module, a data synchronization module and a box body; the data synchronization module is used for synchronously acquiring data and flight parameters of the driving assembly; the first supporting assembly is provided with a fixing assembly. The driving assembly comprises a plurality of rotor wings. According to the utility model, a plurality of monitoring groups are arranged, so that multi-period, multi-sortie and multi-area flexible monitoring can be realized, the accuracy of obtained data is higher, the time cost and the labor cost are saved, the monitoring efficiency can be effectively improved, and the monitoring data of areas in which the data are difficult to obtain previously can be obtained.

The invention discloses a method and a system for improving the tracking performance of a photoelectric pod by using a fast reflector. Belongs to the technical field of photoelectric pod control. Comprising the following steps: constructing a dual-channel tracking control system, adding a fast reflector tracking channel, forming a decoupling dual-channel with an original servo frame channel, and cooperatively realizing dynamic tracking control of a target image; target miss distance information output by the image tracker is obtained, and visual axis deviation angles of the target in the horizontal X-axis direction and the vertical Y-axis direction are calculated respectively; dividing a visual axis deviation angle into a small-amplitude high-frequency signal or a large-amplitude low-frequency signal by taking the maximum swing angle capability of the fast reflector as a threshold value; when the visual axis deviation angle is a small-amplitude high-frequency signal, the fast reflecting mirror executes a tracking compensation function, and the servo frame mechanism performs follow-up compensation so as to expand the stroke of the fast reflecting mirror; and when the visual axis deviation angle is a large-amplitude low-frequency signal, the fast reflecting mirror is kept in the middle position, and target tracking control is independently completed by a servo frame channel.

The invention discloses a high-resolution standardized microarray compound eye lens module and a light field regulation and control system, particularly relates to the technical field of light field regulation and control, and realizes high-precision standardized definition of key parameters of a microlens unit and optical axis micro-angle deviation calibration through a microlens array standardized module. A standardized micro-lens array is used for completing efficient acquisition of multi-view and multi-focus high-resolution light field data of a target three-dimensional scene, and non-consistent temperature control focus drift information and visual axis offset accumulation out-of-control information between micro-arrays are synchronously captured in real time; a light field reconstruction imbalance risk assessment model is cooperatively constructed based on a non-uniform temperature control focus drift coefficient and a visual axis offset accumulation out-of-control coefficient between microarrays, a light field reconstruction imbalance risk assessment index is output in real time, quantitative assessment and dynamic early warning of the imbalance risk degree in the light field reconstruction process are achieved, and an intelligent decision basis is provided for reconstruction regulation and control.

The present disclosure allows for accurate and computationally efficient gaze tracking without requiring a corneal reflection. Eye tracking systems and methods are provided. They include obtaining images of the user's face, detecting a head pose, and locating the centre eye rotation, the pupil centre, the optical axis, the cornea centre and finally the visual axis corresponding to the gaze direction using user-specific parameters. Calibration systems and methods are also provided for acquiring the user-specific parameters. They include at least twice displaying a target point for the user to glaze at, directing light to obtain a corneal reflection, obtaining an image of the user's face, detecting the head pose, inferring a transformation to convert coordinates between the world coordinate system and a head coordinate system, and locating the corneal reflection, the cornea centre, the pupil centres and the optical axes. The data acquired thereby is used to compute the parameters.

Methods to trigger eye enrollment without requiring good gaze interaction are described that allow a guest user of a device to initiate partial or full eye enrollment even though their eye model is not known and thus conventional gaze-based interactions do not work well. A gaze tracking system collects gaze data in the background. At any time (or within an interval after a user puts on the device), an eye enrollment can be triggered by detecting some gaze gesture, for example rolling the eyes in a large circle, or moving the eyes randomly for a time that exceeds a threshold. Depending on the coverage of the gaze / cornea data collected in the background, a full eye enrollment or only a visual axis enrollment may be performed in response to the gesture.

The utility model discloses a desktop remote image read-write device, which comprises a support, a plane spectroscope and a concave reflector. Wherein the concave reflecting mirror is fixedly arranged on the bracket; the concave reflecting mirror is perpendicular to the visual axis and is arranged at a position far away from human eyes; the plane spectroscope is obliquely arranged close to human eyes, and the included angle between the plane spectroscope and the visual axis ranges from 30 degrees to 60 degrees. Light reflected by the desktop and an object placed on the desktop is emitted to the plane spectroscope from the lower part, is reflected by the plane spectroscope, is emitted to the concave reflector, is reflected by the concave reflector, penetrates through the plane spectroscope, is emitted to an exit pupil position, and is imaged at a position not less than 3 meters. Compared with an off-axis imaging remote lens, the desktop remote image read-write device based on the coaxial Birdbath optical system design has the advantages that a far image which is almost free of distortion and high in definition can be obtained under the condition that a free-form surface is not introduced, meanwhile, the difficulty of machining, assembling and adjusting is reduced, the structure is more stable, and the imaging effect is easier to guarantee.

The invention provides a multi-mode composite stability control method for a three-degree-of-freedom photoelectric servo turntable, which comprises the following steps of: using gyroscope information, combined inertial navigation information and image feature information; through composite control of multiple modes such as carrier angle disturbance negative feedback, carrier linear motion translation compensation and evaluation and compensation of errors from image feature information, the limitation of a single-mode control method is effectively overcome, the advantages of each single-mode control method are fully played, performance complementation is realized, and the system performance is improved. And the precision of optical axis stability of the photoelectric detector is improved. According to the method, when a single data source fails, the high-precision stability of the optical television shaft can still be kept, the robustness of servo stability and the adaptability to a complex dynamic environment are improved, and the method conforms to the development direction of photoelectric intellectualization.

A weapon display device includes a display engine, a waveguide, and a chassis. The display engine is configured to selectively output light. The waveguide is configured to receive the light from the display and output graphics to the user. The chassis is coupled to the display engine and the waveguide, and is further configured to releasably mount to one of a weapon or an optic mounted to the weapon such that a field of view through the waveguide is aligned with an optical axis of the optic.

An endoscope system includes: a processor; an endoscope; a holder configured to hold the endoscope and adjust a position and an orientation of the endoscope; and a display. The processor acquires a first position of a first port for inserting, into an examination subject, a first treatment tool, a second position of a second port for inserting, into the examination subject, a second treatment tool, and a third position of a focus target in the examination subject, and rotates the image on a basis of the acquired first, second, and third positions such that a particular relative angle is formed between a direction of a second vector, which is a projection of a first vector indicating an up-down direction of the focus target as viewed from an operator onto a plane orthogonal to a visual axis of the endoscope and an up-down direction of the image displayed on the display.

A display system includes a source of unpolarized image light, and a stack of polarization-selective optical elements operable to switchably convert the unpolarized image light into two orthogonally polarized light beams, each of which being switchable in at least one beam characteristic. An output polarizer selects one of the two orthogonally polarized light beams for providing to a user. A depolarizer may be disposed between an electronic display emitting polarized light and the stack. The depolarizer may be in the form of an LC bilayer with randomized in-plane optic axis.

The invention relates to the technical field of precision optical control, in particular to a sum-difference mode cooperative control double-actuator visual axis stable imaging method and system, and the method comprises the steps: calculating a sum mode variable and a difference mode variable between the angular velocity information of a first actuator and the angular velocity information of a second actuator; performing inverse mode transformation on the two mode variables to obtain independent control commands for respectively controlling the first actuator and the second actuator; the two independent control commands are correspondingly input into the first actuator and the second actuator after being processed through a control algorithm based on data driving. The ultra-high precision of the two actuators is effectively combined, stable control over the optical axis of the optical imaging system is achieved, and the imaging definition and stability of the optical imaging system in the disturbance environment are remarkably improved.