CN108387993B - Rotatable lens device and tracking method based on eyeball tracking technology - Google Patents

Abstract

The present invention relates to a rotatable lens device, which includes a main body part, which includes a camber-shaped rotating seat, and the camber-surface-type rotating seat is arranged on the main body part; The lens is fixed in the cambered accommodating slot, the cambered accommodating slot is accommodated in the cambered swivel base, and the cambered accommodating slot can rotate along the cambered swivel base; the rotating part is provided with Between the main body part and the lens part, the lens part is driven to rotate; the control part is arranged inside the main body part and is electrically connected with the rotating part; a tracking method based on eye tracking technology uses a rotatable lens device to realize eye tracking; The rotation of the cambered accommodating slot relative to the cambered swivel has high efficiency and good real-time performance; the lens component is controlled by the control component to follow the eyeball rotation of the observer to realize automatic rotation, with convenient and flexible operation, accurate and instant positioning.

Description

A rotatable lens device and tracking method based on eye tracking technology

technical field

The present invention relates to the field of eye tracking technology and lens technology, in particular to the technical field of rotatable lens combined with eye tracking technology, and in particular to a rotatable lens device based on eye tracking technology and a tracking method thereof, which are used in mobile phones, tablet computers and other products , used for image capture and video chat, the camera rotates following the movement of the human eye.

Background technique

With the coverage of the fourth-generation mobile network and optical network, the network has entered an era of faster speed, more products, and lower tariffs. The minimum network speed can reach more than 10M, and the clarity and fluency of video images will become better and better. Video chat will become more and more popular, and an efficient, fast and convenient way of video chat will become a development direction in the future. The main component of video chat is the lens. Therefore, the smart lens will become a hot spot in future research. In addition, humans observe different angles of scenery through head movement or eye movement. According to this feature, it will be a very effective and meaningful way to apply it to smart lenses.

At present, most cameras, mobile phones, tablet computers and other products on the market can only take pictures of people, objects, landscapes, etc. in front of the lens. The lens is fixed, and the fixed lens brings inconvenience to certain functions of mobile phones and other products, especially in During the video chat, you cannot change the field of view captured by the other party's lens in real time by yourself. You can only achieve the effect by informing the other party and rotating the position of the product. It has the disadvantages of inconvenient operation, very low efficiency, poor real-time performance, and cannot be accurately positioned in real time. In addition, there are also a small number of mobile phones or other products with rotatable lenses on the market. Although the direction of the lens can be changed manually to achieve the effect of changing the field of view, the field of view cannot be intelligently changed in real time, especially in video chat. The disadvantages of changing the effect of the field of view captured in the opponent's lens by yourself are low efficiency and poor real-time performance.

In the Chinese invention patent CN103293828B, an electronic product with a rotatable lens is described, and the position and direction of the lens can be changed by manual control, and the specific content can be found in the patent CN103293828B. Similar patents include patent CN1882044A and patent CN103019010A and so on. Patents for rotatable lenses based on eye-tracking technology are largely unseen.

Therefore, there is an urgent need for a new type of smart lens, which can change the position of the lens according to eye movements, and can actively observe the surrounding environment of the other party in real time during the video chat process. positioning, etc.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the background technology, the present invention provides a rotatable lens device and a tracking method based on eye tracking technology.

The technical scheme adopted by the present invention is: a rotatable lens device, which includes a main body part, which includes a cambered rotating seat, and the cambered surface type rotating seat is arranged on the main body part; the lens part includes a lens and a cambered surface The lens is fixed in the cambered accommodating slot, the cambered accommodating slot is accommodated in the cambered swivel base, and the cambered accommodating slot can rotate along the cambered swivel base The rotating part is arranged between the main body part and the lens part to drive the lens part to rotate; the control part is arranged inside the main body part and is electrically connected with the rotating part.

The rotating component includes a first driving component, a second driving component, a first rotating component and a second rotating component. The first driving component is arranged on the main body component and drives the first rotating component to drive the lens component to rotate along the arc surface. The seat rotates left and right; the second driving member is arranged on the main body part, and drives the second rotating assembly to drive the lens part to rotate up and down along the arc-shaped rotating seat.

The first rotating assembly includes a matching rack and gear, or a matching guide rail and a slider, and the second rotating assembly includes a matching rack and gear, or matching guide rail and slider.

The cambered swivel seat includes a first cambered swivel seat and a second cambered swivel seat, and the guide rails or racks are mounted on the inner side of the first cambered swivel seat along the left-right direction and/or in the front-rear direction Installed on the inner side of the second cambered rotating seat, the slider or the gear is fixed on the outer side of the cambered accommodating groove or the outer side of the first cambered rotating seat, and is matched with the guide rail or the rack.

The guide rail includes a first guide rail and a second guide rail. The two ends of the first guide rail take the axis of the camber type rotating seat as the center of symmetry and are fixed on the inner side of the camber type rotating seat; The end takes the first guide rail as the center of symmetry, and is fixed on the inner side of the cambered rotating seat. The first guide rail and the second guide rail are matched, and the part between the two ends of the first guide rail and the part between the two ends of the second guide rail can swing along the inner side of the arc-shaped rotating seat.

The slider is made of magnetic material, and a magnetic block for fixing the slider is correspondingly provided, and the magnetic block and the slider are located on both sides of one surface.

The cambered rotating seat is an inner hollow shell, the slider and the corresponding guide rail are hidden inside the cambered rotating seat, the slider is a magnetic slider, and the slider and the guide rail are in the arc. The inside of the surface swivel seat can swing freely.

The cambered swivel seat is an inner hollow shell, and the guide rail includes a first guide rail and a second guide rail. The inside of the cambered rotating seat; the two ends of the second guide rail are fixed inside the cambered rotating seat with the first guide rail as the center of symmetry, and the sliding block includes a first sliding block and a second sliding block, both of which are It is fixed inside the arc-shaped accommodating groove, and is matched with the corresponding first guide rail and second guide rail, and the part between the two ends of the first guide rail and the part between the two ends of the second guide rail can be The inside of the cambered rotating seat swings, the sliding block is made of magnetic material, and a magnetic block that attracts the sliding block is fixed on the inner side of the cambered accommodating groove.

A tracking method based on eye tracking technology, the steps of which are:

1) The lens is facing the eyes, and the observer's head is required to face the main body part, which can be moved in parallel, the eyes are fixed on the display part, the image at this moment is collected, and the image is sent to the control part;

2) Extract all outer eye images in the image by the control component, and perform image noise reduction, rotation and correction;

3) Using the center point of the outer eye as the reference point, calculate the amount that the center point of the iris is offset from the center point of the outer eye, take the average value, obtain the offset amount of the eyeball, and obtain the rotation angle of the rotating part by formula conversion;

4) The control part sends the rotation angle to the rotation part to drive the lens part to rotate.

The relationship between the offset of the eyeball and the rotation angle of the rotating part described in step 3), the specific calculation process is as follows:

31) Establish a Cartesian coordinate system XOY in the lateral direction of the human eye. The right direction of the line connecting the corner of the eye is the positive direction of the X axis, and the vertical upward direction of the center of the line is the positive direction of the Y axis. The offset of the eyeball on the X axis is recorded as x, and the eyeball is in the The Y-axis offset is recorded as y;

32) Establish a rectangular coordinate system ZOY in the longitudinal direction of the human eye, take the eye axis as the Z axis, and record the eye axis length as z, then the eyeball radius R=z/2, the left and right offset of the eyeball is y, corresponding to the up and down rotation of the eyeball The angle θ2 is, according to the geometric relationship, we can get

In the same way, the left and right rotation angle θ1 of the eyeball is:

33) The rotating part 3 is a two-dimensional rotation, and the attitude angle is set as the left and right rotation angle α1 and the up and down rotation angle α2. According to the geometric relationship, the left and right rotation angle α1 and the up and down rotation angle α2 are respectively:

The direction regulation is consistent with the direction of eye movement.

The beneficial effects of the present invention are: the rotation of the cambered accommodating groove relative to the cambered swivel seat of the present invention has high efficiency and good real-time performance; the control unit controls the lens unit to follow the eyeball rotation of the observer to realize automatic rotation, and the operation is convenient and flexible , accurate and instant positioning.

Description of drawings

FIG. 1 is a schematic view of the structure of the main body part of the present invention.

FIG. 2 is an embodiment of a lens assembly of the present invention.

FIG. 3 is an embodiment of the lens assembly of the present invention.

FIG. 4 is an embodiment of the lens assembly of the present invention.

FIG. 5 is an embodiment of the lens assembly of the present invention.

FIG. 6 is a flow chart of the displacement of the eyeball according to the present invention.

Figure 7 is a schematic diagram of the eye and lens assembly of the present invention.

FIG. 8 is a schematic diagram of the XOY coordinate system of the present invention.

FIG. 9 is a schematic diagram of the YOZ coordinate system of the present invention.

Figure 10 is an example of use of the present invention.

Detailed ways

In the present invention, the inner side refers to the outer surface of the inner concave layer. For example, the inner side of the cambered rotary seat refers to the outer surface of the inner concave layer of the cambered rotary seat; the outer side refers to the outer surface of the outer convex layer, such as the cambered rotary seat. The outer side of the seat refers to the outer surface of the convex layer of the cambered rotary seat.

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

As shown in FIGS. 1 and 2, a rotatable lens device includes a main body part 1, which includes a cambered rotary base 11, which is arranged on the main body part 1; a lens part 2, which It includes a lens 21 and a cambered accommodating slot 22, the lens 21 is fixed in the cambered accommodating slot 22 by screws, and the cambered accommodating slot 22 is accommodated in the cambered rotating seat 11, so The arc-shaped accommodating groove 22 can rotate along the arc-shaped rotating base 11; the rotating part 3 is arranged between the main body part 1 and the lens part 2 to drive the lens part 2 to rotate; the control part 5 is arranged on the main body part 1 Inside, it is electrically connected with the rotating part 3, and the rotation of the cambered accommodating groove 22 relative to the cambered swivel base 11 has high efficiency and good real-time performance; the lens part 2 is controlled by the control part 5 to follow the eyeball of the observer to rotate to realize automatic rotation , the operation is convenient and flexible, the positioning is accurate and instant.

The rotating member 3 can realize one-dimensional rotation or two-dimensional rotation.

As shown in Figure 2, one-dimensional rotation can be rotated left and right, or can be rotated up and down; the rotating part 3 includes a driving part and a rotating assembly, the driving part is arranged on the main body part 1, and the driving rotating assembly drives the lens part 2 along the The cambered rotating seat 11 rotates left and right or up and down.

As shown in FIG. 3, the two-dimensional rotation can rotate left and right as well as up and down; the rotating member 3 includes a first driving member 31, a second driving member 32, a first rotating assembly and a second rotating assembly. The first driving member 31 is disposed on the main body part 1, and drives the first rotating assembly to drive the lens part 2 to rotate left and right along the arc-shaped rotating base 11; the second driving member 32 is disposed on the main body part 1, and drives the second rotating assembly. Drive the lens component 2 to rotate up and down along the cambered rotating base 11, the first driving member 31 and the second driving member 32 are motors, and more preferably, servo motors are used to realize immediate emergency stop and accurately control the first driving member 31 and the second driving member 32. Rotation angle of a rotating assembly and a second rotating assembly.

The first rotating assembly can include a guide rail 41 (or a rack) and a sliding block 42 (or a gear) matched with it, and the second rotating assembly is also the same, including a guide rail 41 (or a rack), and The sliding block 42 (or gear) matched with it, here, can allow one rotating component to use the cooperation of the guide rail 41 and the sliding block 42, and the other rotating component to use the cooperation of the rack and the gear.

As shown in FIG. 3 , with two cambered rotating seats, the first rotating assembly and the second rotating assembly both adopt the cooperation of the guide rail 41 and the sliding block 42 as an example.

The cambered swivel base 11 includes a first cambered swivel 111 and a second cambered swivel 112, and the first cambered swivel 111 is higher than the second cambered swivel 112, and a guide rail 41a The other guide rail 41b is installed on the inner side of the second cambered rotating seat 112 in the front-rear direction, and the slider 42a corresponding to the guide rail 41a is fixed in the cambered accommodating groove. On the outside of 22, the slider 42b corresponding to the guide rail 41b is fixed on the outside of the first arc-shaped rotating seat 111. During the rotation, the slider 42a slides along the guide rail 41a to drive the lens part 2 to rotate left and right. After the left and right rotation is completed, The slider 42b slides along the guide rail 41b, and drives the lens component 2 to rotate up and down, so as to complete the up and down rotation, and finally make the lens 21 correspond to the rotation of the human eyeball. The rotation of the lens component 2 relative to the first arc-shaped rotating base 111 will not cause any influence on the second arc-shaped rotating base 112. When the first arc-shaped rotating base 111 moves up and down relative to the second arc-shaped rotating base 112 At the same time, the cooperation of the guide rail 41a and the slider 42a between the first cambered rotary seat 111 and the cambered accommodating slot 22 just constitutes the limit of the first cambered rotary seat 111 to the cambered accommodating slot 22, so that the The first cambered rotating seat 111 and the cambered accommodating groove 22 are moved up and down relative to the second cambered rotating seat 112 at the same time. Similarly, the up and down rotation of the first cambered rotating seat 111 can be performed first, and then the left and right rotation of the cambered accommodating groove 22 can be performed; or it can be performed simultaneously.

The guide rail 41 is installed on the inner side of the cambered swivel base 11, and the guide rail 41 can be directly fixed on the inner and outer surfaces of the cambered swivel base 11, and the guide rail 41 is higher than the inner side of the cambered swivel base 11; a more preferred solution , the guide rail 41 is embedded from the inner surface of the camber type rotating seat 11 into the camber type rotating seat 11, and the guide rail 41 is flush with the inner side of the camber type rotating seat 11, or the guide rail groove is directly processed on the inner side of the camber type rotating seat 11 , forming the guide rail 41 .

The sliding block 42 can be a common sliding block, so that it can be directly installed at the corresponding position by means of fasteners.

The slider 42 may be a magnetic slider, and a corresponding magnetic block 43 for fixing the slider 42 is provided. The magnetic block 43 and the magnetic slider here refer to magnetic materials that can attract each other, such as iron blocks. In the case of magnets, magnets and magnets, and the like, the magnetic slider may be the slider itself using magnetism, or it may be formed by a magnet block fixed on the slider 42 .

In the above embodiment, the slider 42a is located outside the arc-shaped accommodating groove 22, the magnetic block 43a is located inside the arc-shaped accommodating groove 22 or embedded in the arc-shaped accommodating groove 22, and the slider 42b is located in the first arc-shaped accommodating groove 22. On the outside of the surface-type rotating seat 111, the magnetic block 43b is located inside the first arc-type rotating seat 111 or is embedded in the arc-type receiving groove 22, the slider 42a and the magnet block 43a are attracted together, and the slider 42b and the The magnetic blocks 43b are attracted together, and the first driving member 31 drives the slider 42a on the guide rail 41a, and the slider 42a drives the attracted magnet 43a fixed on the arc-shaped receiving groove 22, so as to drive the connection and control The lens component 1 rotates left and right around the first arc-shaped rotating base 111 ; similarly, after the left and right rotation is completed, the second driving member 32 drives to complete the up and down rotation; or it can be performed simultaneously.

As shown in FIG. 4 , taking a camber-type rotating seat, the first rotating assembly and the second rotating assembly both adopt the cooperation of the guide rail 41 and the slider 42 as an example.

The guide rail 41 includes a first guide rail 411 and a second guide rail 412. The two ends of the first guide rail 411 take the axis of the cambered rotating seat 11 as the center of symmetry and are fixed on the inner side of the cambered rotating seat 11; Both ends of the second guide rail 412 take the first guide rail 411 as the center of symmetry, and are fixed on the inner side of the arc-shaped rotating seat 11. The slider 42 includes a first slider 421 and a second slider 422, both of which are fixed on the arc surface. The outer side of the surface-type accommodating groove 22 is adapted to the corresponding first guide rail 411 and the second guide rail 412. The part between the two ends of the first guide rail 411 and the part between the two ends of the second guide rail 412 are both It can swing along the inner side of the camber-type rotating seat 11, and rotate left and right first, then the first slider 421 will slide left and right along the first guide rail 411, and the camber-type accommodating groove 22 is driven relative to the camber-type rotating seat 11 due to the left-right rotation. There is an offset, and the second sliding block 422 is fixed on the arc-shaped accommodating groove 22, and will rotate with the arc-shaped accommodating groove 22, and the second sliding block 422 is always in contact with the second guide rail 412, Therefore, during the left and right rotation, the second sliding block 422 will drive the part between the two ends of the second guide rail 412 to shift to the left or right at the same time; The second guide rail 412 slides up and down. It can also be rotated up and down first, and then rotated left and right. There is no sequence relationship between the two. rotation.

As shown in FIG. 5 , taking a cambered rotating seat with a hollow inside, the first rotating assembly and the second rotating assembly both adopt the cooperation of the guide rail 41 and the slider 42 as an example.

The cambered swivel base 11 is a hollow shell, the guide rail 41 includes a first guide rail 411 and a second guide rail 412, and the two ends of the first guide rail 411 are centered on the cambered swivel base. The center of symmetry is fixed inside the arc-shaped rotating seat 11; the two ends of the second guide rail 412 take the first guide rail 411 as the center of symmetry, and are fixed inside the arc-shaped rotating seat 11, and the slider 42 includes the first guide rail 411 as the center of symmetry. A sliding block 421 and a second sliding block 422 are fixed inside the arc-shaped accommodating groove 22 and are matched with the corresponding first guide rail 411 and the second guide rail 412 . The part between the two ends of the second guide rail 412 and the part between the two ends of the second guide rail 412 can swing along the interior of the cambered rotating seat 11 , the slider 42 is made of magnetic material, and a The magnet block 43 attracting the slider 42 .

As shown in Figure 6 and Figure 7, a tracking method based on eye tracking technology, its steps are:

1) the lens 21 is facing the eyes, and the head 7 of the observer is required to face the described main body part 1, and can be moved in parallel, the eyes are fixed on the display part 6, the image at this moment is collected, and the image is sent to the control part 5;

2) Extract all outer eye images in the image by the control component 5, and perform image noise reduction, rotation and correction;

3) use the outer eye center point as the reference point, calculate the amount that the iris center point offsets the outer eye center point, take the average value, obtain the eyeball offset, and obtain the rotation angle of the rotating part 3 by formula conversion;

4) The control part 5 sends the rotation angle to the rotation part 3 to drive the lens part 2 to rotate.

As shown in Figure 8 and Figure 9, the relationship between the eyeball offset and the rotation angle of the rotating member 3 described in step 3), the specific calculation process is as follows:

31) For the sake of simplicity, a Cartesian coordinate system XOY is established in the lateral direction of the human eye. The right direction of the line connecting the corner of the eye is the positive direction of the X axis, and the vertical upward direction of the center of the line is the positive direction of the Y axis, and the eyeball offset is recorded as (x , y);

32) Since the human eyeball is an axis (eye axis) symmetrical system, for the sake of simplicity, the longitudinal section of the human eye is taken for analysis, and a rectangular coordinate system ZOY is established in the longitudinal direction of the human eye, the eye axis is used as the Z axis, and the length of the eye axis is recorded. is z, it is known that the length z of the normal human eye axis (the distance between the cornea and the retina) is about 24mm, and the human eyeball is approximately spherical. The center of the sphere) rotates, then the radius of the eyeball is R=z/2=12mm. Assuming that the left and right offset of the eyeball is y, the corresponding up and down rotation angle of the eyeball is θ2. According to the geometric relationship, we can get

In the same way, the left and right rotation angle θ1 of the eyeball is:

33) The rotating part 3 is a two-dimensional rotation, the attitude angle is set as the left and right rotation angle α1 and the up and down rotation angle α2, and its rotation method is consistent with the eyeball rotation method, imitating the rotation of the human eye, then the eyeball rotation angle is the same as the rotation angle of the lens part, according to The geometric relationship, the left and right rotation angle α1 and the up and down rotation angle α2 are respectively:

The direction regulation is consistent with the direction of eye movement.

The main body part 1 can be any suitable product, and can be an electronic product such as a mobile phone, a tablet computer, and a notebook computer.

In order to realize the intelligent and active rotation of the lens following the observer's human eyes, so as to achieve a full viewing angle and freely view the surrounding environment of the observed person, of course, for the active rotation, an authorization program can be set in the corresponding main body part 1, only in the The rotatable lens device will automatically rotate only when the authorization program is turned on. In a specific embodiment of the present invention, the specific eye tracking method and steps in the video chat process are as follows:

As shown in Figure 10, assuming that A is the observer, B is the observed, and the observer's head A7 is facing the main body part A1, first, through the authorization of the observer, enable the function of the observer's lens to follow the observer's eyeball automatically. , the face video collected by the lens part A2 is sent to the main part B1 through the main part A1, and at the same time, the control part B5 will collect the image at this moment, extract all the outer eye images in the figure, and perform image noise reduction, rotation and correction. Wait for image preprocessing, analyze the outer eye center and iris center of the eyeball, and use the outer eye center point as a reference point, calculate the amount of the iris center point offset from the outer eye center point, take the average value, and obtain the eyeball offset; then, Through formula conversion between the eyeball offset and the rotation angle of the rotating part B3, the angle that the lens part B2 needs to be rotated is analyzed, and the calculated rotation angle is sent to the rotating part B3, and the lens part B1 is driven to rotate; The captured video is sent to the main part A1, the main part A1 is displayed on the display part A6, and the observer A can see the scene on the other side that he wants to see. Finally, the observer A can move the head A7 to observe. Person A looks at the display part A6, the head A7 faces the main body part A1, and repeats the above steps to realize the observation of the B area from different angles. Similarly, the observed person B can also see the scene on the side of the observer A through the display part B6.

The embodiments described above in conjunction with the accompanying drawings are only preferred embodiments of the present invention, rather than limiting the protection scope of the present invention. Any improvements made based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims (3)

1. a tracking method based on eye tracking technology, is characterized in that: it adopts 2 rotatable lens devices, and each rotatable lens device comprises a main body part (1), comprising a cambered rotating seat (11), the cambered rotating seat (11) being arranged on the main body part (1); A lens component (2), comprising a lens (21) and an arc-shaped accommodating groove (22), the lens (21) being fixed in the arc-shaped accommodating groove (22), and the arc-shaped accommodating groove ( 22) being accommodated in the cambered swivel seat (11), and the cambered accommodating groove (22) can rotate along the cambered swivel seat (11); a rotating part (3), arranged between the main body part (1) and the lens part (2), to drive the lens part (2) to rotate; a control part (5), arranged inside the main body part (1), and electrically connected with the rotating part (3); The rotating component (3) includes a first driving member (31), a second driving member (32), a first rotating assembly and a second rotating assembly, The first driving member (31) is arranged on the main body part (1), and drives the first rotating assembly to drive the lens part (2) to rotate left and right; The second driving member (32) is arranged on the main body part (1), and drives the second rotating assembly to drive the lens part (2) to rotate up and down; The first rotating assembly includes a matching rack and gear, or a matching guide rail (41) and a slider (42), and the second rotating assembly includes a matching rack and gear, or a matching guide rail (41) and slider (42); The guide rail (41) includes a first guide rail (411) and a second guide rail (412). Both ends of the first guide rail (411) take the axis of the camber type rotating seat as the center of symmetry, and are fixed on the camber type rotating seat. The inner side of the rotating seat (11); the two ends of the second guide rail (412) take the first guide rail (411) as the center of symmetry, and are fixed on the inner side of the arc-shaped rotating seat (11), and the sliding block (42) It includes a first sliding block (421) and a second sliding block (422), both of which are fixed on the outer side of the arc-shaped accommodating groove (22) and are in phase with the corresponding first guide rail (411) and second guide rail (412). Adaptation, the part between the two ends of the first guide rail (411) and the part between the two ends of the second guide rail (412) can swing along the inner side of the arc-shaped rotating seat (11); The steps are: 1) the lens (21) of the observer faces the eyes of the observer, collects the real-time image of the observer's eyes, and sends the image to the control part (5) of the observed person; 2) Extract all outer eye images in the image by the control part (5) of the observed person, and perform image noise reduction, rotation and correction; 3) Using the center point of the outer eye as the reference point, calculate the amount that the center point of the iris deviates from the center point of the outer eye, take the average value to obtain the offset amount of the eyeball, and obtain the rotation of the rotating part (3) of the observed person through formula conversion angle; 4) The control part (5) of the person being observed sends the rotation angle to the rotating part (3) of the person being observed, so as to drive the lens part (2) of the person being observed to rotate, and then the lens part ( 2) The photographed scene is transmitted to the main body part (1) of the observer, and the main body part (1) of the observer is displayed by the display part (6) of the observer, so that the observer can see the person to be observed. Scenery over there. 2. The tracking method based on eye tracking technology according to claim 1, wherein the slider (42) is made of magnetic material, and a magnetic block (43) for fixing the slider (42) is correspondingly provided. ), the magnetic block (43) and the slider (42) are located on the inner and outer sides of the arc-shaped accommodating groove (22). 3. the tracking method based on eyeball tracking technology according to claim 2, is characterized in that: the relation between the eyeball offset described in the step 3) and the rotation angle of the rotating part (3), its concrete calculation process is as follows: 31) Establish a Cartesian coordinate system XOY in the lateral direction of the human eye. The right direction of the line connecting the corner of the eye is the positive direction of the X axis, and the vertical upward direction of the center of the line is the positive direction of the Y axis. The offset of the eyeball on the X axis is recorded as x, and the eyeball is in the The Y-axis offset is recorded as y; 32) Establish a rectangular coordinate system ZOY in the longitudinal direction of the human eye, take the eye axis as the Z axis, and record the eye axis length as z, then the eyeball radius R=z/2, and the left and right offset of the eyeball is y, corresponding to the up and down rotation of the eyeball The angle θ2 is, according to the geometric relationship, we can get

In the same way, the left and right rotation angle θ1 of the eyeball is:

33) The rotating part 3 is a two-dimensional rotation, and the attitude angle is set as the left and right rotation angle α1 and the up and down rotation angle α2. According to the geometric relationship, the left and right rotation angle α1 and the up and down rotation angle α2 are respectively:

The direction regulation is consistent with the direction of eye movement.

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