CN211786989U - Head-mounted eye movement tracking device - Google Patents
Head-mounted eye movement tracking device Download PDFInfo
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- CN211786989U CN211786989U CN201921786768.0U CN201921786768U CN211786989U CN 211786989 U CN211786989 U CN 211786989U CN 201921786768 U CN201921786768 U CN 201921786768U CN 211786989 U CN211786989 U CN 211786989U
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Abstract
The utility model discloses a wear-type eye movement tracking means. The utility model is worn on the head of a user and comprises a head wearing piece, a micro infrared camera module arranged in the head wearing piece, an eye video image processing module, a wireless data transmission module and a power supply module; when the utility model is worn on the head, the infrared camera bracket on the head wearing piece is adjusted to be aligned with the eye, so that a clear eye image can be displayed; the eyeball motion track can be recorded, and reference is provided for the diagnosis of mental diseases; the system can track the sight line information of human eyes, detect blinking actions and convert the blinking actions into mouse signals to control the use of digital terminals such as computers, mobile phones and the like. The utility model discloses can provide supplementary to pathological examination, the mental disease diagnosis of patient's eye for the doctor, can also realize through the rough replacement mouse of eye movement information control cursor, for inconvenient personage who uses mouse with the hand bring facility, and equipment cost is low, it is convenient to dress.
Description
Technical Field
The utility model relates to an eye movement tracer field especially relates to a wear-type eye movement tracer.
Background
The eyes are important organs for acquiring information from the surrounding world, and can be used as important basis for researching human psychological activities and extracting psychological consciousness by accurately measuring the fixation point of one person, and the fixation point can be used for replacing a mouse or touch operation to realize human-computer interaction by utilizing the fixation point; the eye movement tracking device is used as a sight line drop point measuring device, and has wide application prospects in various industries, including the fields of rehabilitation, advertisement design, game design, human-computer interface design and the like. Although the eye tracking device has a wide application prospect, most of the existing eye tracking devices in China at present are head-limited, and a measured person needs to fix the head on a plane, and the head cannot move during measurement, so that the eye tracking device is very inflexible. Moreover, the distance between the camera and the human eyes is far, the proportion of the pixels of the human eyes in each frame of image acquired by the camera is small, and the interference caused by a complex background image cannot be avoided, so that the tracking algorithm on the non-wearable device is high in complexity, large in calculated amount, high in requirement on hardware operation speed, low in instantaneity and poor in user experience, and the hardware resources of the controlled device are occupied.
If can provide a wearable eye tracking device in head, dress elasticity, camera angle are adjustable, can be suitable for different individual and the wearing comfortablely of use, and the core is not calculated from the area, thereby occupies the hardware resource of controlled equipment in a large number and reduces the hardware performance requirement to controlled equipment, can improve the use of eye tracking technique greatly and experience, and market prospect is wide. Therefore, the utility model is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving some defects that present eye movement tracer exists, and discloses a low cost's wearable eye movement tracer.
A head-wearing type eye movement tracking device comprises a head wearing piece (1), a micro infrared camera module (2) arranged in the head wearing piece, an eye video image processing module (3), a wireless data transmission module (4) and a power supply module (5); the eye tracking system has three working modes of eye imaging, eyeball track tracking and eye sight tracking;
the head wearing piece (1) is provided with a USB Type-C input socket (1-1), a rear fixing clamping band (1-2), a front fixing clamping band (1-3), an LED indicating lamp (1-4), a multifunctional light touch key (1-5), a left camera bracket (1-6), a right camera bracket (1-7), a clamping band tightness adjusting left knob (1-8), a left camera bracket rotation adjusting knob (1-9), a clamping band tightness adjusting right knob (1-10) and a right camera bracket rotation adjusting knob (1-11);
wherein the multifunctional light touch key (1-5) is positioned in the middle of the front side of the front fixed clamping belt (1-3); the LED indicator lamps (1-4) are positioned at two sides of the multifunctional light touch key (1-5); the left camera bracket (1-6) is connected with the left tail end of the front fixing clamping belt (1-3); the right camera bracket (1-7) is connected with the tail end of the right side of the front fixing clamping belt (1-3); the USB Type-C input socket (1-1) is positioned in the middle of the outer side of the cavity of the rear fixed clamping belt (1-2); the left clamping belt tightness adjusting knob (1-8) is positioned at the left connecting part of the rear fixed clamping belt (1-2) and the front fixed clamping belt (1-3); the right clamping belt tightness adjusting knob (1-10) is positioned at the right connecting part of the rear fixed clamping belt (1-2) and the front fixed clamping belt (1-3); the left camera bracket rotation adjusting knob (1-9) is positioned at the joint of the left camera bracket (1-6) and the front fixing clamping belt (1-3), and the right camera bracket rotation adjusting knob (1-11) is positioned at the right joint of the right camera bracket (1-7) and the front fixing clamping belt (1-3); the USB Type-C input socket (1-1) is used as a charging input and limited data transmission socket; the multifunctional light touch key (1-5) is used for turning on or off the head-mounted eye tracking device, indicating the state of a switch and switching the working mode; the LED indicator lamps (1-4) are used for indicating different working modes, charging states and residual electric quantity; the rear fixing clamping belt (1-2) and the front fixing clamping belt (1-3) are used for wearing the device on the head; the left clamping belt tightness adjusting knob (1-8) and the right clamping belt tightness adjusting knob (1-10) are used for adjusting the tightness of the device to adapt to different users; the left camera bracket (1-6) and the right camera bracket (1-7) are respectively used for fixing the miniature infrared camera and can respectively rotate up and down by taking the left camera bracket rotation adjusting knob (1-9) and the right camera bracket rotation adjusting knob (1-11) as centers; the left camera bracket rotation adjusting knob (1-9) and the right camera bracket rotation adjusting knob (1-11) are respectively used for adjusting the rotation positions of the left camera bracket (1-6) and the right camera bracket (1-7) to enable the micro infrared camera to be aligned to the eye;
the eye video image processing module (3) arranged in the head wearing piece (1) is respectively connected with the micro infrared camera module (2), the wireless data transmission module (4) and the power supply module (5);
the eye video image processing module (3) comprises an eye video image data cache circuit unit (3-1), an FPGA image processing and control circuit unit (3-2), an LED indicator lamp driving circuit unit (3-3) and a key circuit unit (3-4); the miniature infrared camera module (2) is used for collecting the eye images of the user; the eye video image processing module (3) is used for processing video image signals output by the micro infrared camera module (2) to complete pupil center positioning and eye action identification; the wireless data transmission module (4) is used for transmitting the processing result obtained by the eye video image processing module (3) to a mobile phone or a computer in a wireless mode; the power supply module (5) comprises a charging circuit unit (5-1) and a 3.7V polymer lithium battery (5-2) and is used for supplying power to the system.
The number of the cameras of the miniature infrared camera module (2) is 2, and the left camera bracket (1-6) and the right camera bracket (1-7) which are respectively arranged in the head wearing piece (1) are integrated with an infrared light-emitting diode; the middle position of the rear side of the rear fixing clamping belt (1-2) is provided with a cavity for fixing and protecting an eye video image processing module (3), a wireless data transmission module (4) and a power supply module (5); the FPGA image processing and control circuit unit (3-2) in the eye video image processing module (3) is respectively connected with an eye video image data cache circuit unit (3-1), an LED indicator lamp driving circuit unit (3-3) and a key circuit unit (3-4); the eye video image data cache circuit unit (3-1) is used for caching video image data output by the micro infrared camera module (2) by taking a frame as a unit; the FPGA image processing and control circuit unit (3-2) is used for reading eye video image data from the eye video image data cache circuit unit (3-1) by taking a frame as a unit, processing the eye video image data to realize pupil center positioning and eye action identification, transmitting an obtained processing result to the wireless data transmission module (4), judging the state of the multifunctional light touch key (1-5) according to an output result of the key circuit unit (3-4) to realize switching of a working mode and controlling the display of the LED indicator light driving circuit unit (3-3); the charging circuit unit (5-1) in the power module (5) is used for charging a 3.7V polymer lithium battery (5-2) through a USB Type-C input socket (1-1); the 3.7V polymer lithium battery (5-2) provides working voltage for each module.
The utility model has the advantages that:
the utility model provides a wear-type eye movement tracking device, camera find a view angle is adjustable, dress elasticity is adjustable, applicable to different individual and the wearing is comfortable, only need to wear it on the head, adjust the camera bracket and make the camera be in the position that can shoot clear eye image and not shelter from people's eye sight, can realize tracking people's eye fixation point, track eyeball movement track, and present the effect of clear people's eye image; the wireless data transmission can be used for being associated with digital terminals such as computers, mobile phones and the like; corresponding driving software is installed at the computer end or the mobile phone end, and when the human eye sight tracking working mode is adopted, the purpose that a mouse or touch operation is replaced by a human eye fixation point to use a computer or a mobile phone can be achieved; when the eye tracking or eye imaging mode is adopted, clear eye real-time images can be displayed at a computer or a mobile phone end. The eye movement control mouse can provide assistance for doctors to pathological examination and mental disease diagnosis of the eyes of patients, can also realize that the mouse is roughly replaced by controlling the cursor through the eye movement information, and brings convenience for people who are inconvenient to use the mouse with hands. The digital image processing is carried out by taking the embedded hardware as a computing core, the hardware resource occupancy rate of the controlled equipment is low, the hardware performance requirement of the controlled equipment is lower, the use limit is less, the equipment cost is low, and the wearing is convenient.
Drawings
Fig. 1 is a left side view of a head wearing part of a head-mounted eye movement tracking device according to the present invention;
fig. 2 is a right side view of a head-worn eye movement tracking device of the present invention;
fig. 3 is a rear view of a head wearing part of a head-mounted eye movement tracking device according to the present invention;
fig. 4 is a block diagram of a system module of a head-mounted eye tracking device according to the present invention;
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the modules and/or circuits closely related to the solution according to the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.
The first embodiment is as follows:
as shown in fig. 1, 2, and 3, the head-mounted eye tracking device according to the present embodiment includes:
a head wearing member 1 for wearing the device on the head of various individuals and fixing and protecting electronic components required for the device; the head wearing piece 1 is provided with a USB Type-C input socket 1-1, a rear fixing clamping band 1-2, a front fixing clamping band 1-3, an LED indicator lamp 1-4, a multifunctional light touch key 1-5, a left camera bracket 1-6, a right camera bracket 1-7, a clamping band tightness adjusting left knob 1-8, a left camera bracket rotation adjusting knob 1-9, a clamping band tightness adjusting right knob 1-10 and a right camera bracket rotation adjusting knob 1-11;
the multifunctional light touch key 1-5 is positioned in the middle of the front side of the front fixed clamping belt 1-3 and is used for turning on or off the eye movement centering device, indicating the state of a switch and switching the working mode; the multifunctional light touch key 1-5 is lightly pressed, the multifunctional light touch key 1-5 emits red light, the eye movement tracking device is opened and defaulted to be in an eye imaging working mode, and left and right camera brackets can be adjusted according to an imaging effect, so that the camera is positioned at a position where clear eye images can be shot and the sight line of human eyes is not shielded; then quickly pressing the multifunctional light touch keys 1-5 for two times, and switching to an eyeball motion track tracking mode after the red light emitted by the multifunctional light touch keys flickers for one time; then, quickly pressing two multifunctional light touch keys 1-5, and switching to a human eye sight tracking mode after the red light emitted by the keys flickers; lightly pressing the two multifunctional light touch keys 1-5, and switching the eye imaging mode to the default eye imaging mode after the red light emitted by the keys flickers; long-pressing the multifunctional light touch key 1-5, turning off red light of the multifunctional light touch key 1-5, and turning off the eye tracking device;
the LED indicator lamps 1-4 are positioned at two sides of the multifunctional light touch key 1-5; when the eye tracking device is in different working states, the LED indicator lamp on the left side of the multifunctional light touch key 1-5 presents different colors so as to indicate different working states; the LED indicator lamp on the right side of the multifunctional light touch key 1-5 is used for indicating different electric quantity grades, and when the residual electric quantity is 100% -70%, the LED indicator lamp emits green light; when the residual capacity is between 69% and 40%, the battery emits yellow light; when the electric quantity is 39% -10%, the red light is emitted; when the electric quantity is lower than 10%, the lamp twinkles to emit red light; when the device is charged, the device flickers to emit green light, and when the electric quantity is full, the device is a constant green light;
the left camera bracket 1-6 is connected with the left end of the front fixing clamping belt 1-3; the device can be used for fixing and adjusting the miniature infrared camera module; the right camera bracket 1-7 is connected with the right tail end of the front fixing clamping belt 1-3 and used for fixing and adjusting the miniature infrared camera module;
the USB Type-C input socket 1-1 is positioned in the middle of the outer side of the cavity of the rear fixing clamping belt 1-2; the device is used for realizing charging and wired data transmission of the device;
the left clamping belt tightness adjusting knob 1-8 is positioned at the left connecting part of the rear fixed clamping belt 1-2 and the front fixed clamping belt 1-3; the right clamping belt tightness adjusting knob 1-10 is positioned at the right connecting part of the rear fixed clamping belt 1-2 and the front fixed clamping belt 1-3; the diameter of a circle formed by the rear fixing clamping band 1-2 and the front fixing clamping band 1-3 can be adjusted by rotating the left knob 1-8 and the right knob 1-10, so that individuals with different head diameters can firmly wear the device on the head;
the left camera bracket rotation adjusting knob 1-9 is positioned at the joint of the left camera bracket 1-6 and the front fixing clamping belt 1-3, the right camera bracket rotation adjusting knob 1-11 is positioned at the right joint of the right camera bracket 1-7 and the front fixing clamping belt 1-3, and the rotation positions of the left camera bracket 1-6 and the right camera bracket 1-7 are respectively adjusted to enable the micro infrared camera to be aligned with the eye;
the second embodiment is as follows: unlike the first embodiment, the head-mounted eye tracking apparatus according to the present embodiment, as shown in fig. 1 and 4, includes:
the miniature infrared camera module 2, the eye video image processing module 3, the wireless data transmission module 4 and the power module 5 are arranged in the head wearing piece 1; the eye video image processing module 3 is respectively connected with the micro infrared camera module 2, the wireless data transmission module 4 and the power supply module 5; the device comprises a micro infrared camera module, a micro infrared light-emitting diode module and a micro infrared camera module, wherein 2 micro infrared camera modules are integrated with the micro infrared light-emitting diode and are responsible for collecting human eye video image data; the eye video image processing module 3 is responsible for processing the algorithm of the whole eye movement tracking device, the wireless data transmission module 4 is used for transmitting the result obtained after the eye video image data is processed by the eye video image processing module 3 to the associated digital equipment such as a computer or a mobile phone in a wireless mode, and the power supply module 5 is used for supplying power and charging the system;
the third concrete implementation mode: in contrast to the second embodiment, the head-mounted eye tracking apparatus of the present embodiment is shown in fig. 4:
the eye video image processing module (3) comprises an eye video image data cache circuit unit 3-1, an FPGA image processing and control circuit unit 3-2, an LED indicator lamp driving circuit unit 3-3 and a key circuit unit 3-4; an FPGA image processing and control circuit unit 3-2 in the eye video image processing module 3 is respectively connected with an eye video image data cache circuit unit 3-1, an LED indicator lamp driving circuit unit 3-3 and a key circuit unit 3-4; the eye video image data cache circuit unit 3-1 is used for caching the video image data output by the micro infrared camera module 2 by taking a frame as a unit; the FPGA image processing and control circuit unit 3-2 is used for reading eye video image data from the eye video image data cache circuit unit 3-1 by taking a frame as a unit, processing the eye video image data to realize pupil center positioning and eye action identification, transmitting an obtained processing result to the wireless data transmission module 4, judging the state of the multifunctional light touch key 1-5 according to an output result of the key circuit unit 3-4 to realize switching of a working mode and controlling the display of the LED indicator light driving circuit unit 3-3;
the power module 5 comprises a charging circuit unit 5-1 and a 3.7V polymer lithium battery 5-2; wherein the charging circuit unit (5-1) is used for realizing the charging of the 3.7V polymer lithium battery 5-2 through the USB Type-C input socket 1-1.
The fourth concrete implementation mode: different from the third embodiment, the eye tracking algorithm of the head-mounted eye tracking device according to the present embodiment includes the following steps:
step one, collecting bright and dark pupil images:
the micro infrared light emitting diode integrated by the micro infrared camera module 2 flickers at a certain frequency, the FPGA image processing and control circuit unit 3-2 in the eye video image processing module 3 controls the frame rate of the image output by the micro infrared camera module 2 and the flickering frequency of the micro infrared light emitting diode to make the frequencies of the two same, so that the obtained eye images are images supplemented by the micro infrared diode in the continuous 2 frames of images, only one frame of image is an image supplemented by the micro infrared diode, the two continuous frames of images including the pupils of human eyes are images with alternating bright pupils and dark pupils respectively, and the two frames of images are cached in the eye video image data caching circuit unit 3-1.
Step two, pupil center coordinate extraction:
obtaining bright and dark pupil images by utilizing the step one, and an FPGAThe image processing and control circuit unit 3-2 reads two continuous frames of images from the eye video image data buffer circuit unit 3-1, and performs difference operation according to the formula (1-1) by using the pixels in the current frame of image and the pixels corresponding to the next frame of image; wherein T is1To set the threshold value, (x)i) Representing the x-th frame of a current frame in two successive frames of imagesiValue of pixel, B (x)i) A value representing a pixel of a subsequent frame in two consecutive frames of images; determining the pixels meeting the formula (1-1) as pupil image pixels in the eye image, and otherwise, determining the pixels as non-pupil image pixels; setting the pupil image pixel as 1 and the non-pupil image pixel as 0 to form a binary image, thereby obtaining a binary image only containing the pupil, respectively calculating the minimum circumscribed circle of the pupil image pixel, and taking the center of the circle as the pupil center coordinate;
F(xi)-B(xi)>T1(1-1)
step three, mouse time sequence simulation:
the wireless data transmission module 4 encodes the obtained pupil center coordinate data into a signal data format of the mouse, simulates the signal time sequence of the mouse equipment, and transmits the data out, so that the eye tracking device can be used as the mouse equipment by a related computer or a mobile phone and the like, the movement of a mouse cursor is controlled by the movement of the center coordinate, and the equipment which supports mouse control can be controlled by the eye tracking device;
although the invention has been described in terms of the above embodiments, persons skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated which are within the scope of the invention as described herein. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
Claims (2)
1. A head-mounted eye movement tracking device, comprising: the eye-protection type head wearing piece comprises a head wearing piece (1), a miniature infrared camera module (2) arranged in the head wearing piece, an eye video image processing module (3), a wireless data transmission module (4) and a power supply module (5); the eye tracking system has three working modes of eye imaging, eyeball track tracking and eye sight tracking;
the head wearing piece (1) is provided with a USB Type-C input socket (1-1), a rear fixing clamping band (1-2), a front fixing clamping band (1-3), an LED indicating lamp (1-4), a multifunctional light touch key (1-5), a left camera bracket (1-6), a right camera bracket (1-7), a clamping band tightness adjusting left knob (1-8), a left camera bracket rotation adjusting knob (1-9), a clamping band tightness adjusting right knob (1-10) and a right camera bracket rotation adjusting knob (1-11); wherein the multifunctional light touch key (1-5) is positioned in the middle of the front side of the front fixed clamping belt (1-3); the LED indicator lamps (1-4) are positioned at two sides of the multifunctional light touch key (1-5); the left camera bracket (1-6) is connected with the left tail end of the front fixing clamping belt (1-3); the right camera bracket (1-7) is connected with the tail end of the right side of the front fixing clamping belt (1-3); the USB Type-C input socket (1-1) is positioned in the middle of the outer side of the cavity of the rear fixed clamping belt (1-2); the left clamping belt tightness adjusting knob (1-8) is positioned at the left connecting part of the rear fixed clamping belt (1-2) and the front fixed clamping belt (1-3); the right clamping belt tightness adjusting knob (1-10) is positioned at the right connecting part of the rear fixed clamping belt (1-2) and the front fixed clamping belt (1-3); the left camera bracket rotation adjusting knob (1-9) is positioned at the joint of the left camera bracket (1-6) and the front fixing clamping belt (1-3), and the right camera bracket rotation adjusting knob (1-11) is positioned at the right joint of the right camera bracket (1-7) and the front fixing clamping belt (1-3);
the USB Type-C input socket (1-1) is used as a charging input and a wired data transmission socket; the multifunctional light touch key (1-5) is used for turning on or off the head-mounted eye tracking device, indicating the state of a switch and switching the working mode; the LED indicator lamps (1-4) are used for indicating different working modes, charging states and residual electric quantity; the rear fixing clamping belt (1-2) and the front fixing clamping belt (1-3) are used for wearing the device on the head; the clamping belt tightness adjusting left knob (1-8) and the clamping belt tightness adjusting right knob (1-10) are used for adjusting the wearing tightness so as to be suitable for different wearing individuals; the left camera bracket (1-6) and the right camera bracket (1-7) are respectively used for fixing the miniature infrared camera and can respectively rotate up and down by taking the left camera bracket rotation adjusting knob (1-9) and the right camera bracket rotation adjusting knob (1-11) as centers; the left camera bracket rotation adjusting knob (1-9) and the right camera bracket rotation adjusting knob (1-11) are respectively used for adjusting the rotation positions of the left camera bracket (1-6) and the right camera bracket (1-7) so that the micro infrared camera can be aligned to eyes;
the eye video image processing module (3) arranged in the head wearing piece (1) is respectively connected with the micro infrared camera module (2), the wireless data transmission module (4) and the power supply module (5); the eye video image processing module (3) comprises an eye video image data cache circuit unit (3-1), an FPGA image processing and control circuit unit (3-2), an LED indicator lamp driving circuit unit (3-3) and a key circuit unit (3-4);
the miniature infrared camera module (2) is used for collecting the eye images of the user; the eye video image processing module (3) is used for processing video image signals output by the micro infrared camera module (2) to complete pupil center positioning and eye action identification; the wireless data transmission module (4) is used for transmitting the processing result obtained by the eye video image processing module (3) to a mobile phone or a computer in a wireless mode; the power supply module (5) comprises a charging circuit unit (5-1) and a 3.7V polymer lithium battery (5-2) and is used for supplying power to the system.
2. A head-mounted eye tracking device according to claim 1, wherein: the number of the cameras of the miniature infrared camera module (2) is 2, and the left camera bracket (1-6) and the right camera bracket (1-7) which are respectively arranged in the head wearing piece (1) are integrated with a miniature infrared light-emitting diode; the middle position of the rear side of the rear fixing clamping belt (1-2) is provided with a cavity for fixing and protecting an eye video image processing module (3), a wireless data transmission module (4) and a power supply module (5); the FPGA image processing and control circuit unit (3-2) in the eye video image processing module (3) is respectively connected with an eye video image data cache circuit unit (3-1), an LED indicator lamp driving circuit unit (3-3) and a key circuit unit (3-4); the eye video image data cache circuit unit (3-1) is used for caching video image data output by the micro infrared camera module (2) by taking a frame as a unit; the FPGA image processing and control circuit unit (3-2) is used for reading eye video image data from the eye video image data cache circuit unit (3-1) by taking a frame as a unit, processing the eye video image data to realize pupil center positioning and eye action identification, transmitting an obtained processing result to the wireless data transmission module (4), judging the state of the multifunctional light touch key (1-5) according to an output result of the key circuit unit (3-4) to realize switching of a working mode and controlling the display of the LED indicator light driving circuit unit (3-3); the charging circuit unit (5-1) in the power module (5) is used for charging a 3.7V polymer lithium battery (5-2) through a USB Type-C input socket (1-1); the 3.7V polymer lithium battery (5-2) provides working voltage for each module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921786768.0U CN211786989U (en) | 2019-10-23 | 2019-10-23 | Head-mounted eye movement tracking device |
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| CN201921786768.0U CN211786989U (en) | 2019-10-23 | 2019-10-23 | Head-mounted eye movement tracking device |
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