CN109965838A - One kind tracking oculomotor device and method based on optical coherence method - Google Patents
One kind tracking oculomotor device and method based on optical coherence method Download PDFInfo
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- A61B3/0016—Operational features thereof
- A61B3/0025—Operational features thereof characterised by electronic signal processing, e.g. eye models
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- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/113—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining or recording eye movement
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Abstract
The present invention provides a kind of optical coherence methods to track oculomotor device and method, the device includes Fourier Optics coherent tomographic system and several Time Domain Optical coherent tomographic systems, 3-D scanning can be carried out to human eye by Fourier Optics coherent tomographic system, establish its measured's eyeball phantom, then in conjunction with the depth information of Time Domain Optical coherent tomographic system real-time detection human eye each point, it can accomplish that real-time position of human eye is analyzed then in conjunction with Modeling Calculation；Eyeball tracking measurement accuracy is high；Further, for Time Domain Optical coherent tomographic components of system as directed, changed using high-speed rotating one-side coated glass body light source to reference arm optical path length, to reach the coherent interference with human eye different depth position, so that systematic survey frequency and precision are substantially improved.
Description
Technical field
The invention belongs to eye movement tracer technique fields, and in particular to one kind tracks eye movement based on optical coherence method
Device and method.
Background technique
Eyeball tracking technology is a kind of currently " to be watched attentively using the various detection means acquisition subjects such as machinery, electronics, optics
The technology in direction ".With the rapid development of computer vision, artificial intelligence technology and digitizing technique, eyeball tracking technology is
As current hotspot research field, in field of human-computer interaction extensive application, for example, can be applied to virtual reality, enhancing now
The multiple fields such as reality, vehicle assistant drive, user experience, cognitive disorder diagnosis.
Currently, tracking human eye movement's method be based on common camera module, by calculate two captured it is small when
Between be spaced under eyeball position picture pixel difference, realize to oculomotor tracking.
However through inventor the study found that the existing eyeball tracking mould group real-time for realizing eyeball tracking technology not
Height, trace error rate is also higher, so that existing eyeball tracking mould group is unable to complete high-precision such as short distance VR immersion interaction
It is required that.
Optical coherent chromatographic imaging (optical coherence tomography, OCT) be the 1990s gradually
The new three-dimensional chromatography imaging technique of one kind made of development.OCT obtains the chromatography energy of depth direction based on low coherence interference principle
Power, the two dimension or 3-D image of biological tissue or material internal structure can be reconstructed by scanning, and signal contrast is derived from
The spatial variations of biological tissue or material internal optical reflection (scattering) characteristic.The core component of the imaging pattern includes broadband light
Source, Michelson's interferometer and photodetector, axial resolution depend on the coherence length of wideband light source, can generally reach
To 1-10 μm, and radial resolving power is similar with ordinary optical microscope, is decided by the size of sample interior focal beam spot, generally
In micron dimension.OCT has many advantages, such as that non-contact, non-intruding, image taking speed fast (real-time dynamic imaging), detectivity are high.
Summary of the invention
It is an object of the present invention to provide one kind to track oculomotor device and method, Ke Yishi based on optical coherence method
When track, and it is high to track measurement accuracy.
In order to reach above-mentioned technical purpose, technical scheme is as follows: one kind tracking eyeball based on optical coherence method
The device of movement, including
One Fourier Optics coherent tomographic system, for scanning the initial threedimensional model for obtaining measured's eyes；
Several Time Domain Optical coherent tomographic systems obtain the depth information of measured's eye scanning point for real time scan；
And processor, the image information for being obtained according to the scanning of each optical system establish measured's three-dimensional eyeball model；
And calculate cornea each position curvature and location information at the moment.
Further, the Time Domain Optical coherent tomographic system includes reference arm, the reference arm include the first lens group,
High speed rotation one-side coated glass body, the first stationary mirror are incident on high speed rotation by the first lens group after light beam enters
One-side coated glass body, then reaches stationary mirror.Further, the Time Domain Optical coherent tomographic system has 4.
Further, distance of the scanning element of the Time Domain Optical coherent tomographic system apart from eyeball central point is 8mm.
Further, the Time Domain Optical coherent tomographic system includes sample arm, and the sample arm includes the second lens group
The first scanning galvanometer is reached after the second lens group with the light beam of the first scanning galvanometer, entrance, is then reflected into person under test's eyes
It is scanned.
Further, the Time Domain Optical coherent tomographic system further includes having line position motor, for adjusting the position of scanning element
It sets.
Further, the Time Domain Optical coherent tomographic system includes first light source, the central wavelength of the first light source
For 960nm.
Further, the Fourier Optics coherent tomographic system includes second light source, the second fiber coupler, reference
Arm, sample arm and spectrometer；Wherein the reference arm includes the third lens and the second stationary mirror；The sample arm includes the
Four lens, the second scanning galvanometer, object lens；Spectrometer includes the 5th lens, grating, CCD camera；The light that second light source issues, warp
Reference arm and sample arm are respectively enterd after second fiber coupler beam splitting, the light into reference arm focuses on second through the third lens
Stationary mirror back reflection, the light backtracking that part scatters backward enter fiber coupler, form reference light；Into sample
The light of product arm successively focuses on person under test's eyes after the 4th lens, scanning galvanometer, object lens, is then scanned, after scanning
The light part backtracking scattered backward enters the second fiber coupler, forms sample light, reference light and sample light, occurs dry
It relates to, interference light enters after spectrometer through raster beam-splitting, is imaged respectively through the 5th lens focus to CCD camera.
Further, the central wavelength of the second light source is 960nm.
Another aspect of the present invention additionally provides one kind based on above-mentioned apparatus and tracks oculomotor method, including as follows
Step；
S1 is carried out C-scan to measured's eyes using Fourier Optics coherent tomographic system, is established using processor tested
Person's eyes threedimensional model, and cornea each position curvature at the moment is calculated,
S2, according to curvature, adjustment positions the scanning element position of each Time Domain Optical coherent tomographic system；
S3 obtains the depth information of scanning element using each scanning element of each Time Domain Optical coherent tomographic system real time scan；
The real-time deep information of S4, the scanning element that processor will acquire bring model into, and the reality of eyeball central point is calculated
When position.
Optical coherence method provided by the invention tracks oculomotor device, including Fourier Optics coherent tomographic system and
Several Time Domain Optical coherent tomographic systems can carry out 3-D scanning to human eye by Fourier Optics coherent tomographic system, build
Its measured's eyeball phantom is found, is believed then in conjunction with the depth of each scanning element point of Time Domain Optical coherent tomographic system real-time detection human eye
Breath can accomplish that real-time position of human eye is analyzed then in conjunction with Modeling Calculation, and tracking measurement accuracy is high；Further, for when
Domain optical coherence tomographic system part changes the method for coherence position by changing the mobile reference arm of tradition, using high speed rotation
Reflecting mirror come change light source to reference arm optical path length, to reach the coherent interference with human eye different depth position.
Traditional translation variation the variation rotated around center is changed to, so that the measuring precision is substantially improved, while identical electricity
Light path change frequency is rotated under machine hardware case can change frequency much larger than translation light path, that is, the reality of measurement be greatly improved
Shi Xing.
Detailed description of the invention
Fig. 1 is the embodiment of the present invention based on the oculomotor schematic device of optical coherence method tracking；
Fig. 2 is the Time Domain Optical coherent tomographic system structure diagram of the embodiment of the present invention；
Fig. 3 is the schematic diagram that high speed rotation one-side coated glass structural reform becomes coherence position；
The Fourier Optics coherent tomographic system structure diagram of Fig. 4 embodiment of the present invention；
Fig. 5 the device of the invention recovery eye movement method flow diagram；
Tracking eye movement method schematic diagram Fig. 6 of the invention.
Specific embodiment
The technical solution that the present invention will be described in detail in the following with reference to the drawings and specific embodiments.
The present invention provides one kind to track oculomotor device based on optical coherence method, comprising:
One Fourier Optics coherent tomographic system, for scanning the initial threedimensional model for obtaining measured's eyes；
Several Time Domain Optical coherent tomographic systems obtain the depth information of measured's eye scanning point for real time scan；
And processor, the image information for being obtained according to the scanning of each optical system establish measured's three-dimensional eyeball model；
And calculate cornea each position curvature and location information at the moment.
3-D scanning can be carried out to human eye by Fourier Optics coherent tomographic system, establish its measured's eyeball mould
Type can then in conjunction with Modeling Calculation then in conjunction with the depth information of Time Domain Optical coherent tomographic system real-time detection human eye each point
To accomplish real-time position of human eye analysis；Eyeball tracking measurement accuracy is high.
Embodiment 1
As shown in figures 1 to 6, a kind of that oculomotor device is tracked based on optical coherence method, including a Fourier Optics is concerned with
Tomographic system, for scanning the initial threedimensional model for obtaining measured's eyes；4 Time Domain Optical coherent tomographic systems, for real
When scanning obtain measured's eyes and correspond to the depth information of point；And processor 9, the figure for being obtained according to optical path scanning
As establishing measured's three-dimensional eyeball model；And calculate cornea each position curvature and location information at the moment.
Wherein, as shown in Fig. 2, Time Domain Optical coherent tomographic system includes first light source 1, the first fiber coupler 2, reference
Arm, sample arm and photodetector 8；Wherein, reference arm includes the first lens group 3, high speed rotation one-side coated glass body 4, the
One stationary mirror 5, sample arm include the second lens group 6, and the first scanning galvanometer 7,1 central wavelength of light source is 960nm.
The light that first light source 1 issues respectively enters reference arm and sample arm after 2 beam splitting of the first fiber coupler, enters
After parallel, shrink beam, it is solid to reach first through the reflection of high speed rotation one-side coated glass body 4 by the first lens group 3 for the light of reference arm
Determine reflecting mirror 5, then retroeflection, wherein the part light scattered backward by after backtracking enter 2 shape of the first fiber coupler
At reference light；Light into sample arm after parallel, shrink beam, reaches the first scanning galvanometer 7 by the second lens group 6, subsequently into
Sample to be tested scanning, the part light backtracking scattered backward from sample reach the first fiber coupler 2 and form sample light；Sample
Since optical path difference interferes, interference light is collected by photodetector, converts light signals into electric signal, so for product light and reference light
It is imaged by a processor 9 (such as computer terminal PC).
The Time Domain Optical coherent tomographic system is equipped with a high speed rotation one-side coated glass body 4, Ke Yigai in reference arm
Changing light to reference arm optical path length, to reach the coherent interference with human eye different depth position, as shown in Figure 3.It should
Traditional translation variation has been changed to the variation rotated around center by scheme, so that the measuring precision is substantially improved, same to phase
Frequency can be changed much larger than translation light path with light path change frequency is rotated under motor hardware case, so that survey be greatly improved
The real-time of amount.
Time Domain Optical coherent tomographic system has 4, and distance of the scanning element A apart from eyeball central point B to be measured is 8mm.
Time Domain Optical coherent tomographic system further includes having line position motor, for adjusting the position of scanning element, guarantees needle with this
Valid model is established to the measured of different corneal curvatures.
As shown in figure 4, Fourier Optics coherent tomographic system includes second light source 10, the second fiber coupler 11, reference
Arm, sample arm and spectrometer；Wherein reference arm includes the third lens 12 and the second stationary mirror 13；Sample arm includes the 4th saturating
Mirror 14, the second scanning galvanometer 15, object lens 16；Spectrometer includes grating 17, the 5th lens 18, CCD camera 19；Second light source issues
Light, respectively enter reference arm and sample arm after 11 beam splitting of the second fiber coupler, into reference arm light through the third lens
12 focus on 13 back reflection of the second stationary mirror, and the light backtracking that part scatters backward enters the second fiber coupler
11, form reference light；Into the light of sample arm, successively focused on after the 4th lens 14, the second scanning galvanometer 15, object lens 16
Person under test's eyes, are then scanned, and enter the second fiber coupler 11, shape to the light part backtracking of rear scattering after scanning
At sample light, reference light and sample light are interfered, and interference light enters after spectrometer through 17 beam splitting of grating, this is not saturating through the 5th
Mirror 18 focuses on the imaging of CCD camera 19.
First light source 1 and the central wavelength of second light source 10 are 960nm.
With reference to Fig. 5-6, when tracking oculomotor device tracking eye movement using optical coherence method of the invention, including
Following steps；
S1 carries out C-scan to measured's eyes using Fourier Optics coherent tomographic system, establishes quilt using processor 9
Survey person's eyes threedimensional model, and calculate cornea each position curvature at the moment.
Specifically, after measured puts the head into default seat in the plane, one is carried out using Fourier Optics coherent tomographic system
A complete eyeball C-scan (be equivalent to and done many groups of two-dimensional surface scannings), thus the three of measured's eyeball of building
Dimension module.Principle is that the light being emitted back towards when light beam is interfered with reference arm is returned from sample arm according to being optical coherence tomography detection
Journey, and this system uses the near infrared light of wave band 960nm, the light of the wave band is difficult to penetrate human choroidal, last photodetection
It is human eye retina's layer that device, which can receive effective reflected light signal maximum position,.
S2, according to curvature, adjustment positions the relative position scanning element A of each Time Domain Optical coherent tomographic system, guarantees as not
Measured with corneal curvature establishes valid model.
In the threedimensional model that Fourier Optics coherent tomographic system scans, it is bent that cornea each position at the moment can be calculated
Rate.The relative position of 4 sets of Time Domain Optical coherent tomographic systems is positioned with this, every set system has a line position motor fine tuning control
Position guarantees that the measured for different corneal curvatures establishes valid model with this.
S3, each Time Domain Optical coherent tomographic system real time scan obtain the real-time deep information of corresponding scanning element A.
After having determined three-dimensional space, data collecting card corresponding to Time Domain Optical coherent tomographic system start effectively acquire from
The information that photodetector receives, each Time Domain Optical coherent tomographic system acquisition information correspondence are exactly the depth of every layer of the point
Spend information.
S4, the real-time deep information that processor 9 will acquire bring model into, the real time position of eyeball central point B are calculated.
With the rotation of measured's eyeball, four detected depth of Time Domain Optical coherent tomographic system change, in conjunction with
The threedimensional model that Fourier Optics coherent tomographic system is established before, so that it may calculate eyeball center B location (for theoretically
The change of entire model space arbitrary point position can be calculated).
Optical coherence method provided by the invention tracks oculomotor device, including Fourier Optics coherent tomographic system and
Several Time Domain Optical coherent tomographic systems can carry out 3-D scanning to human eye by Fourier Optics coherent tomographic system, build
Its measured's eyeball phantom is found, then in conjunction with the depth information of Time Domain Optical coherent tomographic system real-time detection human eye each point, so
Combine Modeling Calculation that can accomplish real-time position of human eye analysis afterwards；Eyeball tracking measurement accuracy is high；Further, for time domain
Optical coherence tomography part, changes the method for coherence position by changing the mobile reference arm of tradition, and use is high-speed rotating
One-side coated glass block come change light source to reference arm optical path length, to reach relevant with human eye different depth position
Interference.Traditional translation variation has been changed to the variation rotated around center, so that the measuring precision is substantially improved, same to phase
Frequency can be changed much larger than translation light path with light path change frequency is rotated under motor hardware case, that is, measurement be greatly improved
Real-time.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to of the invention
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (10)
1. one kind tracks oculomotor device based on optical coherence method, which is characterized in that including
One Fourier Optics coherent tomographic system, for scanning the initial threedimensional model for obtaining measured's eyes；
Several Time Domain Optical coherent tomographic systems obtain the depth information of measured's eye scanning point for real time scan；
And processor, the image information for being obtained according to the scanning of each optical system establish measured's three-dimensional eyeball model；And meter
Calculate cornea each position curvature and location information at the moment.
2. according to claim 1 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Optical coherence tomography includes reference arm, and the reference arm includes the first lens group, high speed rotation one-side coated glass body, the
One stationary mirror is incident on high speed rotation one-side coated glass body by the first lens group after light beam enters, and then reaches solid
Determine reflecting mirror.
3. according to claim 2 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Optical coherence tomography has 4.
4. according to claim 3 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Distance of the scanning element of Optical coherence tomography apart from eyeball central point is 8mm.
5. according to claim 2 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Optical coherence tomography includes sample arm, and the sample arm includes the second lens group and the first scanning galvanometer, the light beam of entrance
The first scanning galvanometer is reached after the second lens group, is then reflected into person under test's eyes and is scanned.
6. according to claim 1 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Optical coherence tomography further includes having line position motor, for adjusting the position of scanning element.
7. according to claim 1 track oculomotor device based on optical coherence method, which is characterized in that the time domain
Optical coherence tomography includes first light source, and the central wavelength of the first light source is 960nm.
8. according to claim 1 track oculomotor device based on optical coherence method, which is characterized in that in Fu
Leaf Optical coherence tomography includes second light source, the second fiber coupler, reference arm, sample arm and spectrometer；It is wherein described
Reference arm includes the third lens and the second stationary mirror；The sample arm includes the 4th lens, the second scanning galvanometer, object lens；
Spectrometer includes the 5th lens, grating, CCD camera；
The light that second light source issues, respectively enters reference arm and sample arm after the second fiber coupler beam splitting, into reference arm
Light focus on the second stationary mirror back reflection through the third lens, the light that part scatters backward enters light by backtracking
Fine coupler forms reference light；Into the light of sample arm, successively focused on after the 4th lens, scanning galvanometer, object lens to be measured
Person's eyes, are then scanned, and enter the second fiber coupler to the light part backtracking of rear scattering after scanning, form sample
Light, reference light and sample light, interfere, and interference light enters after spectrometer through raster beam-splitting, arrive respectively through the 5th lens focus
CCD camera imaging.
9. according to claim 8 track oculomotor device based on optical coherence method, which is characterized in that described second
The central wavelength of light source is 960nm.
10. one kind will require the described in any item devices of 1-9 to track oculomotor method based on aforesaid right, feature exists
In including the following steps；
Measured's eyes are carried out C-scan using Fourier Optics coherent tomographic system by S1, establish measured's eye using processor
Eyeball threedimensional model, and calculate cornea each position curvature at the moment；
S2, according to curvature, adjustment positions the scanning element position of each Time Domain Optical coherent tomographic system；
S3 obtains the depth information of scanning element using each scanning element of each Time Domain Optical coherent tomographic system real time scan；
The real-time deep information of S4, the scanning element that processor will acquire bring model into, and the real time position of eyeball central point is calculated.
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| CN112446012A (en) * | 2019-08-28 | 2021-03-05 | 南京深视光点科技有限公司 | Eyeball tracking unlocking system and implementation method thereof |
| CN114366019A (en) * | 2022-01-27 | 2022-04-19 | 长春理工大学 | System and method for measuring eyeball parameters |
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