CN210130810U - Device for tracking eyeball movement based on optical dry method - Google Patents
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Abstract
The utility model provides a device of eyeball motion is tracked to optics dry process, the device includes relevant chromatography system of Fourier optics and a plurality of time domain optics, can carry out three-dimensional scanning to the people's eye through relevant chromatography system of Fourier optics, establishes its measurand eyeball model, then combines the depth information of the relevant chromatography system real-time detection people's eye each point of time domain optics, then combines the modeling calculation to accomplish real-time people's eye position analysis; the eyeball tracking measurement precision is high; furthermore, for the time domain optical coherence tomography system part, the optical path distance from the light source to the reference arm is changed by adopting a single-sided coated glass body rotating at a high speed, so that coherent interference with different depth positions of human eyes is achieved, and the measurement frequency and the measurement precision of the system are greatly improved.
Description
Technical Field
The utility model belongs to the technical field of the eye movement is tracked, concretely relates to device based on eye movement is tracked to optics dry method.
Background
The eye tracking technology is a technology for acquiring the current "gaze direction" of a subject by using various detection means such as mechanical, electronic, optical, and the like. With the rapid development of computer vision, artificial intelligence technology and digitization technology, eyeball tracking technology has become a current research field, and has wide application in the field of human-computer interaction, for example, it can be applied in multiple fields such as virtual reality, augmented reality, vehicle-assisted driving, user experience, and cognitive impairment diagnosis.
At present, a method for tracking eye movement is based on a common camera module, and realizes the tracking of eye movement by calculating the pixel difference of two captured images of an eyeball part at a small time interval.
However through the utility model discloses people research discovery, current eyeball tracking module real-time that is used for realizing eyeball tracking technique is not high, and it is also higher to track the error rate for current eyeball tracking module can't accomplish the high accuracy if closely VR immersion interaction requirement.
Optical Coherence Tomography (OCT) is a new three-dimensional tomography technology developed gradually in the 90 s of the 20 th century. OCT obtains the chromatographic capacity in the depth direction based on the principle of low coherence interference, and can reconstruct a two-dimensional or three-dimensional image of the internal structure of biological tissue or material through scanning, wherein the signal contrast of the OCT derives from the spatial change of optical reflection (scattering) characteristics in the biological tissue or material. The core components of the imaging mode comprise a broadband light source, a Michelson interferometer and a photodetector, the axial resolution of the imaging mode depends on the coherence length of the broadband light source and can reach 1-10 μm generally, and the radial resolution is similar to an ordinary optical microscope and depends on the size of a focused light spot inside a sample and is also on the micrometer scale generally. The OCT has the advantages of non-contact, non-invasion, high imaging speed (real-time dynamic imaging), high detection sensitivity and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device based on eyeball motion is tracked to optics looks dry process can be tracked in real time, and tracks measuring accuracy height.
In order to achieve the technical purpose, the technical scheme of the utility model is as follows: an apparatus for tracking eye movement based on optical dry method comprises
The Fourier optical coherence tomography system is used for scanning and acquiring an initial three-dimensional model of the eye of the tested person;
the time-domain optical coherence tomography systems are used for scanning in real time to acquire depth information of scanning points of the eyes of the tested person;
the processor is used for establishing a three-dimensional model of the eyeball of the detected person according to the image information obtained by scanning of each optical system; and calculating the curvature of each position of the cornea in front of the eye and position information.
Furthermore, the time domain optical coherence tomography system comprises a reference arm, wherein the reference arm comprises a first lens group, a high-speed rotating single-sided coated glass body and a first fixed reflector, and light beams enter the first lens group, sequentially pass through the first lens group, enter the high-speed rotating single-sided coated glass body and then reach the fixed reflector.
Further, there are 4 time-domain optical coherence tomography systems.
Further, the distance between the scanning point of the time-domain optical coherence tomography system and the center point of the eyeball is 8 mm.
Further, the time-domain optical coherence tomography system comprises a sample arm, the sample arm comprises a second lens group and a first galvanometer scanner, and the entered light beam reaches the first galvanometer scanner after passing through the second lens group and then is reflected to the eye of the person to be measured for scanning.
Further, the time-domain optical coherence tomography system also comprises a slide motor which is used for adjusting the position of the scanning point.
Further, the time-domain optical coherence tomography system includes a first light source having a center wavelength of 960 nm.
Further, the fourier optical coherence tomography system comprises a second light source, a second fiber coupler, a reference arm, a sample arm and a spectrometer; wherein the reference arm comprises a third lens and a second fixed mirror; the sample arm comprises a fourth lens, a second scanning galvanometer and an objective lens; the spectrometer comprises a fifth lens, a grating and a CCD camera; light emitted by the second light source is split by the second optical fiber coupler and then respectively enters the reference arm and the sample arm, the light entering the reference arm is focused to the second fixed reflector by the third lens and then reflected, and part of the light scattered backwards returns to the optical fiber coupler to form reference light; the light entering the sample arm sequentially passes through the fourth lens, the scanning galvanometer and the objective lens and then is focused on the eyes of a person to be measured, then scanning is carried out, the part of the light scattered after scanning returns to the second optical fiber coupler in the original path, sample light is formed, the reference light and the sample light interfere with each other, the interference light enters the spectrometer and then is split by the grating, and the interference light is focused on the CCD camera through the fifth lens to be imaged.
Further, the second light source has a central wavelength of 960 nm.
The utility model provides a device of eyeball motion is tracked to optics dry process, including relevant chromatography system of Fourier optics and a plurality of time domain optics, can carry out three-dimensional scanning to the people's eye through relevant chromatography system of Fourier optics, establish its measurand eyeball model, then combine the relevant chromatography system of time domain optics to detect the degree of depth information of each scanning point of people's eye in real time, then combine the modeling calculation to accomplish real-time people's eye position analysis, track measuring accuracy height; further, for the time domain optical coherence tomography system part, the traditional method of changing the coherence position by moving the reference arm is changed, and the optical path distance from the light source to the reference arm is changed by adopting a reflector rotating at a high speed, so that the coherent interference with different depth positions of the human eye is achieved. The traditional translation change is changed into the change of rotating around the center, so that the measurement precision of the system is greatly improved, and meanwhile, the rotating optical path change frequency can be far greater than the translating optical path change frequency under the condition of the same motor hardware, so that the measurement real-time performance is greatly improved.
Drawings
Fig. 1 is a schematic diagram of an apparatus for tracking eye movement based on an optical dry method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a time-domain optical coherence tomography system according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a high speed rotating single-sided coated glass body changing coherence position;
FIG. 4 is a schematic diagram of a Fourier optical coherence tomography system according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method of compensating for eye movement by the device of the present invention;
fig. 6 is a schematic view of the method for tracking eye movement of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a device based on eyeball motion is tracked to optics looks dry process, include:
the Fourier optical coherence tomography system is used for scanning and acquiring an initial three-dimensional model of the eye of the tested person;
the time-domain optical coherence tomography systems are used for scanning in real time to acquire depth information of scanning points of the eyes of the tested person;
the processor is used for establishing a three-dimensional model of the eyeball of the detected person according to the image information obtained by scanning of each optical system; and calculating the curvature of each position of the cornea in front of the eye and position information.
The human eye can be scanned in three dimensions through the Fourier optical coherence tomography system, a tested eyeball model of the human eye can be established, then the depth information of each point of the human eye can be detected in real time by combining the time domain optical coherence tomography system, and then the real-time human eye position analysis can be realized by combining the modeling calculation; the eyeball tracking measurement precision is high.
Example 1
As shown in fig. 1-6, an apparatus for tracking eye movement based on an optical coherence tomography method includes a fourier optical coherence tomography system for scanning and obtaining an initial three-dimensional model of an eye of a subject; 4 time-domain optical coherence tomography systems for scanning in real time to obtain depth information of corresponding points of the eyes of the tested person; the processor 9 is used for establishing a three-dimensional model of the eyeball of the detected person according to the image obtained by the optical path scanning; and calculating the curvature of each position of the cornea in front of the eye and position information.
As shown in fig. 2, the time-domain optical coherence tomography system includes a first light source 1, a first fiber coupler 2, a reference arm, a sample arm, and a photodetector 8; the reference arm comprises a first lens group 3, a high-speed rotating single-sided coated glass body 4 and a first fixed reflector 5, the sample arm comprises a second lens group 6, a first scanning galvanometer 7, and the central wavelength of the light source 1 is 960 nm.
Light emitted by a first light source 1 is split by a first optical fiber coupler 2 and respectively enters a reference arm and a sample arm, the light entering the reference arm is parallel and contracted by a first lens group 3, is reflected by a high-speed rotating single-sided coated glass body 4 to reach a first fixed reflector 5 and then is reflected backwards, and part of the light scattered backwards returns according to the original path and then enters the first optical fiber coupler 2 to form reference light; after being parallel and shrunk by the second lens group 6, the light entering the sample arm reaches the first scanning galvanometer 7, then enters a sample to be detected for scanning, and returns from a part of light original path scattered backwards on the sample to the first optical fiber coupler 2 to form sample light; the sample light and the reference light interfere with each other due to the optical path difference, and the interference light is collected by the photodetector, converted into an electrical signal, and imaged by a processor 9 (e.g., a computer terminal PC).
According to the time domain optical coherence tomography system, the reference arm is internally provided with the high-speed rotating single-sided coated glass body 4, so that the optical path distance from a light source to the reference arm can be changed, and coherent interference with different depth positions of human eyes can be achieved. According to the scheme, the traditional translation change is changed into the change rotating around the center, so that the measurement precision of the system is greatly improved, and meanwhile, the rotating optical path change frequency can be far greater than the translating optical path change frequency under the condition of the same motor hardware, so that the measurement instantaneity is greatly improved.
The number of the time domain optical coherence tomography systems is 4, and the distance between a scanning point A and the central point B of the eyeball to be detected is 8 mm.
The time domain optical coherence tomography system also comprises a line position motor which is used for adjusting the position of the scanning point, thereby ensuring that effective models are established for the testees with different corneal curvatures.
As shown in fig. 4, the fourier optical coherence tomography system includes a second light source 10, a second fiber coupler 11, a reference arm, a sample arm, and a spectrometer; wherein the reference arm comprises a third lens 12 and a second fixed mirror 13; the sample arm comprises a fourth lens 14, a second scanning galvanometer 15 and an objective lens 16; the spectrometer comprises a grating 17, a fifth lens 18 and a CCD camera 19; light emitted by the second light source enters the reference arm and the sample arm respectively after being partially split by the second optical fiber coupler 11, the light entering the reference arm is focused to the second fixed reflector 13 by the third lens 12 and then reflected, and part of the light scattered backwards returns to the second optical fiber coupler 11 to form reference light; the light entering the sample arm sequentially passes through the fourth lens 14, the second scanning galvanometer 15 and the objective lens 16 and then is focused on the eyes of a person to be measured, then scanning is carried out, the part of the light scattered after scanning returns to the second optical fiber coupler 11 in the original path to form sample light, reference light and sample light which interfere with each other, and the interference light enters the spectrometer, is split by the grating 17 and then is focused on the CCD camera 19 through the fifth lens 18 to be imaged.
The first light source 1 and the second light source 10 each have a central wavelength of 960 nm.
Referring to fig. 4-5, the following steps are included when the device for tracking eye movement by an optical dry method of the present invention is used for tracking eye movement;
s1, C-scanning the eye of the tested person by using a Fourier optical coherence tomography system, establishing a three-dimensional model of the eye of the tested person by using the processor 9, and calculating the curvature of each position of the cornea in front of the eye.
Specifically, after the head of the tested person is placed in a preset machine position, a Fourier optical coherence tomography system is used for carrying out a complete eyeball C-scan (which is equivalent to a plurality of groups of two-dimensional plane scans), so that a three-dimensional model of the eyeball of the tested person is constructed. The principle is based on that optical coherence tomography is an optical path when a light beam reflected from a sample arm interferes with a reference arm, the system adopts near infrared light with a wave band of 960nm, the light with the wave band hardly penetrates through a human eye choroid, and finally, the maximum position of an effective reflected light signal which can be received by a photoelectric detector is a human eye retina layer.
And S2, adjusting and positioning the relative position of the scanning point A of each time-domain optical coherence tomography system according to the curvature, and ensuring that effective models are established for the testees with different corneal curvatures.
In a three-dimensional model scanned by a Fourier optical coherence tomography system, the curvature of each position of the cornea in front of the eye can be calculated. The relative positions of 4 sets of time-domain optical coherence tomography systems are positioned by the method, and each set of system is provided with a line position motor fine adjustment control position, so that effective models are established for the testees with different corneal curvatures.
And S3, scanning each time domain optical coherence tomography system in real time to obtain the real-time depth information of the corresponding scanning point A.
After the three-dimensional space is determined, the data acquisition card corresponding to the time domain optical coherence tomography system starts to effectively acquire the information received from the photoelectric detector, and the information acquired by each time domain optical coherence tomography system corresponds to the depth information of each layer of the point.
And S4, the processor 9 brings the acquired real-time depth information into the model, and calculates to obtain the real-time position of the eyeball center point B.
With the rotation of the eyeball of the tested person, the detection depth of the four time-domain optical coherence tomography systems changes, and the position of the center B of the eyeball can be calculated by combining the three-dimensional model established by the Fourier optical coherence tomography system (theoretically, the change of the position of any point in the whole model space can be calculated).
The utility model provides a device of eyeball motion is tracked to optics dry process, including relevant chromatography system of Fourier optics and a plurality of time domain optics relevant chromatography system, can carry out three-dimensional scanning through relevant chromatography system of Fourier optics to the people's eye, establish its measurand eyeball model, then combine the relevant chromatography system of time domain optics to detect the degree of depth information of people's eye each point in real time, then combine the modeling calculation to accomplish real-time people's eye position analysis; the eyeball tracking measurement precision is high; furthermore, for the time domain optical coherence tomography system part, the traditional method of changing the coherence position by moving the reference arm is changed, and the optical path distance from the light source to the reference arm is changed by adopting a single-sided coated glass block rotating at a high speed, so that the coherent interference with the positions of different depths of human eyes is achieved. The traditional translation change is changed into the change of rotating around the center, so that the measurement precision of the system is greatly improved, and meanwhile, the rotating optical path change frequency can be far greater than the translating optical path change frequency under the condition of the same motor hardware, so that the measurement real-time performance is greatly improved.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. An apparatus for tracking eye movement based on an optical dry method is characterized by comprising
The Fourier optical coherence tomography system is used for scanning and acquiring an initial three-dimensional model of the eye of the tested person;
the time-domain optical coherence tomography systems are used for scanning in real time to acquire depth information of scanning points of the eyes of the tested person;
the processor is used for establishing a three-dimensional model of the eyeball of the detected person according to the image information obtained by scanning of each optical system; and calculating the curvature of each position of the cornea in front of the eye and position information.
2. The apparatus according to claim 1, wherein the time-domain optical coherence tomography system comprises a reference arm, the reference arm comprises a first lens set, a high-speed rotating single-sided coated glass body, and a first fixed reflector, and after entering, the light beam is incident on the high-speed rotating single-sided coated glass body through the first lens set and then reaches the fixed reflector.
3. The apparatus according to claim 2, wherein there are 4 time-domain optical coherence tomography systems.
4. The apparatus according to claim 3, wherein the distance between the scanning point of the temporal optical coherence tomography system and the center point of the eyeball is 8 mm.
5. The apparatus according to claim 2, wherein the time-domain optical coherence tomography system comprises a sample arm, the sample arm comprises a second lens set and a first galvanometer scanner, and the incoming light beam passes through the second lens set and reaches the first galvanometer scanner, and then is reflected to the eye of the subject for scanning.
6. The apparatus according to claim 1, wherein the time-domain optical coherence tomography system further comprises a slide motor for adjusting the position of the scanning point.
7. The apparatus according to claim 1, wherein the time-domain optical coherence tomography system comprises a first light source with a central wavelength of 960 nm.
8. The apparatus for tracking eyeball motion based on the optical dry phase method is characterized in that the Fourier optical coherence tomography system comprises a second light source, a second fiber coupler, a reference arm, a sample arm and a spectrometer; wherein the reference arm comprises a third lens and a second fixed mirror; the sample arm comprises a fourth lens, a second scanning galvanometer and an objective lens; the spectrometer comprises a fifth lens, a grating and a CCD camera;
light emitted by the second light source is split by the second optical fiber coupler and then respectively enters the reference arm and the sample arm, the light entering the reference arm is focused to the second fixed reflector by the third lens and then reflected, and part of the light scattered backwards returns to the optical fiber coupler according to the original path to form reference light; the light entering the sample arm sequentially passes through the fourth lens, the scanning galvanometer and the objective lens and then is focused on the eyes of a person to be measured, then scanning is carried out, the part of the light scattered after scanning returns to the second optical fiber coupler in the original path, sample light is formed, the reference light and the sample light interfere with each other, the interference light enters the spectrometer and then is split by the grating, and the interference light is focused on the CCD camera through the fifth lens to be imaged.
9. The apparatus for tracking eyeball motion based on optical dry method according to claim 8, wherein the center wavelength of the second light source is 960 nm.
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| CN109965838A (en) * | 2019-04-08 | 2019-07-05 | 广东唯仁医疗科技有限公司 | One kind tracking oculomotor device and method based on optical coherence method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109965838A (en) * | 2019-04-08 | 2019-07-05 | 广东唯仁医疗科技有限公司 | One kind tracking oculomotor device and method based on optical coherence method |
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