CN109725416B - Eyeball tracking optical system, head-mounted equipment and imaging method - Google Patents
Eyeball tracking optical system, head-mounted equipment and imaging method Download PDFInfo
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- CN109725416B CN109725416B CN201910188763.6A CN201910188763A CN109725416B CN 109725416 B CN109725416 B CN 109725416B CN 201910188763 A CN201910188763 A CN 201910188763A CN 109725416 B CN109725416 B CN 109725416B
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Abstract
The embodiment of the invention discloses an eyeball tracking optical system, head-mounted equipment and an imaging method. The method comprises the following steps: a light source unit, an eyepiece unit, and a light path control unit; the light source unit is used for emitting light rays with specified wavelength, and the light rays can enter eyes of a user; the eyepiece unit is arranged relative to the eyes of the user, and the light source unit is arranged at the edge of the eyepiece unit; the eyepiece unit is arranged between the eyes and the light path control unit; the light path control unit is arranged on a light path of light emitted by the eyepiece unit and forms a certain included angle with an optical axis; and forming a corresponding first optical path in a first optical path control mode and a corresponding second optical path in a second optical path control mode at the same time in the optical path control unit. The eyeball tracking can be realized, the eyeball imaging quality is improved, and the eyeball tracking accuracy is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of eyeball tracking, in particular to an eyeball tracking optical system, head-mounted equipment and an imaging method.
Background
The eyeball tracking technology is a technology which is widely applied to the fields of man-machine interaction and the like at present and is used for positioning the sight of human eyes, and the eyeball tracking module integrates knowledge in the subject fields of mechanics, electronics, optics and the like. With the rapid development of the fields of artificial intelligence, machine vision and the like, the eyeball tracking technology has good application prospects, such as fatigue monitoring, virtual reality, communication auxiliary tools and the like.
The conventional eye tracking device mainly comprises two parts: an illumination section and an imaging section. The illumination part generally uses a light source in the near infrared band, and the imaging part uses a camera, a lens, and the like which have good response to the near infrared band. The virtual reality equipment adopting the reflective eyeball tracking technology greatly interferes the acquisition operation of image data due to light spots formed by multiple reflections between lenses, thereby influencing the imaging quality and the accuracy of eyeball tracking.
Disclosure of Invention
The embodiment of the invention provides an eyeball tracking optical system, head-mounted equipment and an imaging method, which are used for tracking eyeballs, avoiding the influence of light spots formed by multiple reflections of near infrared light on image acquisition, and improving the quality of eyeball imaging so as to improve the accuracy of eyeball tracking.
In a first aspect, an embodiment of the present invention provides an eyeball-tracking optical system, including: a light source unit, an eyepiece unit, and a light path control unit;
the light source unit is used for emitting light rays with specified wavelength, and the light rays can enter eyes of a user; the eyepiece unit is arranged relative to the eyes of the user, and the light source unit is arranged at the edge of the eyepiece unit; the eyepiece unit is arranged between the eyes and the light path control unit; the light path control unit is arranged on a light path of light emitted by the eyepiece unit and forms a certain included angle with an optical axis; and forming a corresponding first optical path in a first optical path control mode and a corresponding second optical path in a second optical path control mode at the same time in the optical path control unit.
Further, the optical path control unit includes a first optical element disposed to be able to form a corresponding first optical path in the first optical path control mode, and a second optical element disposed to be able to form a corresponding second optical path in the second optical path control mode.
Further, the first optical path control mode is set to be transmissive to light of a first wavelength band and reflective to light of a second wavelength band, wherein the first optical path is an optical path reflected in the first optical path control mode; the second optical path control mode is set to be transmissive to light of the first wavelength band and transmissive or absorptive to light of a second wavelength band, wherein the second optical path is an optical path transmitted by the first wavelength band in the second optical path control mode.
Further, the first optical element comprises at least one of a dichroic mirror or a beam splitter, and further comprises a first optical reflection film system, and the first optical reflection film system is attached to the surface of the dichroic mirror or the beam splitter.
Further, the second optical element at least comprises one of a near-infrared absorption film system or a near-infrared transmission film system, and the near-infrared absorption film system or the near-infrared transmission film system is used for transmitting visible light and preventing near-infrared light from reflecting.
Further, the second optical element is arranged at the outer ring of the first optical element.
Further, the first optical element and the second optical element are arranged to have similar visible light transmittance.
Further, the light of the first wavelength band is a visible light wavelength band; the light of the second wavelength band is in the near infrared wavelength band.
Further: a light filtering unit;
the filtering unit is arranged on the first light path and used for filtering the light of the first wave band.
Further, still include: an imaging unit;
the imaging unit is arranged behind the filtering unit and used for receiving the light with the second waveband filtered by the filtering unit so as to image eyes and the light source.
In a second aspect, an embodiment of the present invention further provides a head-mounted device, including the eyeball tracking optical system and the display screen according to the embodiment of the present invention;
the display screen is a multi-dimensional display screen and is used for displaying multi-dimensional images
In a third aspect, an embodiment of the present invention further provides an imaging method, where the method includes:
the light with the appointed wavelength emitted by the light source unit is irradiated into the eyes of the user;
light reflected by the user's eyes is transmitted to the light path control unit through the eyepiece unit;
the light transmitted to the light path control unit forms a corresponding first light path under the first light path control mode and forms a corresponding second light path under the second light path control mode at the same time; the light path control unit is arranged on a light path of emergent light of the ocular unit and forms a certain included angle with an optical axis.
An eyeball tracking optical system provided by an embodiment of the invention comprises: a light source unit, an eyepiece unit, and a light path control unit; the light source unit is used for emitting light rays with specified wavelength, and the light rays can enter eyes of a user; the eyepiece unit is arranged relative to the eyes of the user, and the light source unit is arranged at the edge of the eyepiece unit; the eyepiece unit is arranged between the eye and the light path control unit; the light path control unit is arranged on a light path of light emitted by the ocular unit and forms a certain included angle with the optical axis; and forming a corresponding first optical path in the first optical path control mode and a corresponding second optical path in the second optical path control mode at the same time in the optical path control unit. The eyeball tracking can be realized, the light path control unit is adopted, so that the light transmitted to the light path control unit follows the same time to form a corresponding first light path under the first light path control mode and a corresponding second light path under the second light path control mode, the light is divided into two paths, the eyeball imaging quality can be improved, and the eyeball tracking accuracy is improved.
Drawings
Fig. 1 is a schematic structural diagram of an eyeball tracking optical system in a first embodiment of the invention;
fig. 2 is a schematic structural diagram of an eyeball tracking optical system in a first embodiment of the invention;
fig. 3 is a front view of an optical path control unit according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of an eye-tracking optical system when a user wears glasses according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a head-mounted device in the second embodiment of the present invention.
Fig. 6 is a flowchart of an imaging method in the third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of an eyeball-tracking optical system according to an embodiment of the present invention, as shown in fig. 1, the optical system includes: a light source unit 11, an eyepiece unit 12, and an optical path control unit 13.
And the light source unit 11 is used for emitting light rays with specified wavelengths, and the light rays can enter the eyes of a user. The eyepiece unit 12 is disposed opposite the eyes of the user, and the light source unit 11 is disposed at the edge of the eyepiece unit 12; the eyepiece unit 12 is provided between the eye and the optical path control unit 13. The light path control unit 13 is arranged on the light path of light emitted by the eyepiece unit 12 and forms a certain included angle with the optical axis; the corresponding first optical path is formed in the first optical path control mode and the corresponding second optical path is formed in the second optical path control mode at the same timing in the optical path control unit 13.
The light source unit 11 irradiates the eye, and the light reflected by the eye propagates to the optical path control unit 13 via the eyepiece unit 12. The light reaching the light path control unit 13 follows the same timing of forming the corresponding first light path in the first light path control mode and forming the corresponding second light path in the second light path control mode.
Optionally, the optical path control unit includes a first optical element and a second optical element, the first optical element is configured to form a corresponding first optical path in the first optical path control mode, and the second optical element is configured to form a corresponding second optical path in the second optical path control mode. A first optical path control mode configured to transmit light of a first wavelength band and reflect light of a second wavelength band, wherein the first optical path is an optical path reflected in the first optical path control mode; the second optical path control mode is set to be transmissive to light of the first wavelength band and transmissive or absorptive to light of the second wavelength band, wherein the second optical path is an optical path transmitted by the first wavelength band in the second optical path control mode.
The light source unit 11 may be a near-infrared light source. Accordingly, the light of the first wavelength band may be a visible light wavelength band, and the light of the second wavelength band may be a near infrared light wavelength band. The number of the light source units 11 may be 1 or more. When the number of the light source units 11 is plural, it can be uniformly arranged at the edge of the eyepiece unit 12. The eyepiece unit 12 may be a head mounted Virtual Reality eyepiece unit, which may be a Virtual Reality (VR) eyepiece or an Augmented Reality (AR) eyepiece. The included angle between the optical path control unit 13 and the optical axis can be any value between 0 and 90 degrees, and the degree of the included angle can be selected according to the actual setting of the system.
Optionally, the first optical element includes at least one of a dichroic mirror and a beam splitter, and further includes a first optical reflection film system, and the first optical reflection film system is attached to a surface of the dichroic mirror or the beam splitter. The first optical reflection film is used for transmitting the light of the first wave band and reflecting the light of the second wave band.
Optionally, the second optical element at least includes one of a near-infrared absorption film system or a near-infrared transmission film system, and the near-infrared absorption film system or the near-infrared transmission film system is used for transmitting visible light and preventing near-infrared light from reflecting.
Optionally, the second optical element is disposed outside the first optical element. The first optical element may be provided in any shape (e.g., circular, rectangular, etc.), and the second optical element may be provided in any shape (e.g., circular, rectangular, etc.). Preferably, the shape of the second optical element is designed based on the shape of the first optical element, e.g. the shape of the second optical element is a circular ring, provided that the shape of the first optical element is circular.
Optionally, fig. 2 is a schematic structural diagram of an eyeball-tracking optical system according to an embodiment of the present invention. As shown in fig. 2, the method further includes: a filter unit 14 and an imaging unit 15.
The filtering unit 14 is disposed on the first light path and configured to filter light in the first wavelength band. The imaging unit 15 is disposed behind the filtering unit 14, and is configured to receive the light of the second wavelength band filtered by the filtering unit, so as to image the eye and the light source.
Exemplarily, fig. 3 is a front view of an optical path control unit in an embodiment of the present invention. As shown in fig. 3, the optical path control unit 13 includes a first optical element 131 and a second optical element 132, the first optical element 131 having a circular shape, and the second optical element 132 having a circular ring shape. A first optical reflection film system is attached to the surface of the first optical element 131 and used for transmitting the light of the first waveband and reflecting the light of the second waveband; the second optical element 132 is bonded with a near-infrared absorption film system or a near-infrared transmission film system for transmitting visible light and preventing near-infrared light from reflecting. In the present embodiment, when the light of the second wavelength band is transmitted from the eyepiece unit 12 to the optical path control unit 13, the light of the second wavelength band that reaches the first optical element 131 is reflected to the filter unit 14, and the light of the second wavelength band that reaches the second optical element 132 is transmitted or absorbed and does not reach the filter unit 14. This has the advantage of preventing light in the second wavelength band that reaches the second optical element 132 from forming a light spot by multiple reflections and then entering the filtering unit 14 and then entering the imaging unit 15. Alternatively, the first optical element 131 and the second optical element 132 are arranged so that the transmittances of visible light are similar. This has the advantage of allowing the virtual reality image to reach the human eye at the same or similar transmittance, so as not to affect the viewing experience of the user.
The filtering unit 14 is configured to filter out light of the first wavelength band of the virtual reality display image and light of the external first wavelength band, so as to prevent the light of the first wavelength band from affecting the image.
Specifically, the working principle of the eye tracking optical system is as follows: the light source irradiates the eyes of the user; the light of the second wave band is reflected at the eye part, and the reflected light is transmitted to the light path control unit after passing through the ocular unit; the light of the second wave band forms a corresponding first light path under the first light path control mode, and the light of the second wave band enters the imaging unit after passing through the filtering unit along the first light path.
In another embodiment, the user wears glasses to track the user's eye. Fig. 4 is a schematic structural diagram of an eye-tracking optical system when a user wears glasses according to an embodiment of the present invention. Such as
As shown in fig. 4, the light source unit 11 irradiates the eyes of the user through the glasses; the light of the second wavelength band is reflected at the eye, and the reflected light is transmitted to the light path control unit 13 after passing through the glasses and the ocular unit 12; the light of the second wavelength band forms a corresponding first light path in the first light path control mode, and the light of the second wavelength band is deflected and enters the imaging unit 15 after passing through the filtering unit 14. In this embodiment, because the user has worn glasses, the light of second wave band takes place multiple reflection between glasses and eyepiece unit, because this application adopts the special design of light path control unit, can avoid the light of second wave band to form the facula because of multiple reflection in imaging unit.
An eyeball tracking optical system provided by an embodiment of the invention comprises: a light source unit, an eyepiece unit, and an optical path control unit. The light source unit is used for emitting light rays with specified wavelength, and the light rays can enter eyes of a user; the eyepiece unit is arranged relative to the eyes of the user, and the light source unit is arranged at the edge of the eyepiece unit; the eyepiece unit is arranged between the eye and the light path control unit; the light path control unit is arranged on a light path of light emitted by the ocular unit and forms a certain included angle with the optical axis; and forming a corresponding first optical path in the first optical path control mode and a corresponding second optical path in the second optical path control mode at the same time in the optical path control unit. The eyeball tracking can be realized, the light path control unit is adopted, so that the light transmitted to the light path control unit follows the same time to form a corresponding first light path under the first light path control mode and a corresponding second light path under the second light path control mode, the light is divided into two paths, the eyeball imaging quality can be improved, and the eyeball tracking accuracy is improved.
Example two
Fig. 5 is a schematic structural diagram of a head-mounted device according to an embodiment of the present invention, and as shown in fig. 5, the head-mounted device includes an eye-tracking optical system 210 and a display screen 220.
The display screen 220 is a multi-dimensional display screen for displaying multi-dimensional images. The eyeball-tracking optical system 210 includes a light source unit, an eyepiece unit, a light path control unit, a filter unit, and an imaging unit.
In this embodiment, the eye tracking apparatus may be integrated on a head-mounted device for performing eye tracking on a user. Head mounted devices include, but are not limited to, AR devices, VR devices, eyeglasses, and the like. The remaining elements included in the head-mounted device are not limited herein, and can be set by those skilled in the art according to actual situations.
In addition, the display screen of the embodiment may be a multi-dimensional display screen. The multi-dimensional display screen may be used to prevent the screens displayed by the head-mounted device from causing a vergence adjustment conflict (i.e., a VAC phenomenon). The pictures that the multidimensional display screen can exhibit can have depth information, namely light is sent out from the point in the space solid, the visual convergence and the focus of human eyes are matched, and the light not only has intensity but also has direction, namely, the light field display technology.
The relationship between the display screen and the eye tracking device in the head-mounted device is not limited herein, and the head-mounted device may control the content displayed on the display screen based on the data determined by the eye tracking device, or may determine the content watched by the user based on the content displayed on the display screen and the data determined by the eye tracking device.
EXAMPLE III
Fig. 6 is a flowchart of an imaging method according to a third embodiment of the present invention, which is executed by the eye-tracking optical system according to the third embodiment of the present invention, as shown in fig. 6, and the method includes the following steps:
in step 410, light of a specified wavelength emitted by the light source unit is irradiated into the eyes of the user.
In step 420, light reflected by the user's eyes is transmitted to the light path control unit via the eyepiece unit.
In step 430, the light transmitted to the light path control unit follows the same time to form a corresponding first light path in the first light path control mode and a corresponding second light path in the second light path control mode.
The optical path control unit is arranged on an optical path of emergent light of the ocular unit and forms a certain included angle with an optical axis. The optical path control unit includes a first optical element disposed to be able to form a corresponding first optical path in the first optical path control mode, and a second optical element disposed to be able to form a corresponding second optical path in the second optical path control mode. The first optical element at least comprises one of a dichroic mirror or a beam splitter, and further comprises a first optical reflection film system, and the first optical reflection film system is attached to the surface of the dichroic mirror or the beam splitter. The second optical element at least comprises one of a near-infrared absorption film system or a near-infrared transmission film system, and the near-infrared absorption film system or the near-infrared transmission film system is used for transmitting visible light and preventing near-infrared light from reflecting.
Wherein the first optical path control mode is set to transmit light of a first wavelength band and reflect light of a second wavelength band, wherein the first optical path is an optical path reflected in the first optical path control mode; the second optical path control mode is set to be transmissive to light of the first wavelength band and transmissive or absorptive to light of the second wavelength band, wherein the second optical path is an optical path transmitted by the first wavelength band in the second optical path control mode.
The principle of imaging may be: the light source irradiates the eyes of a user, light in a second waveband is reflected at the eyes, the reflected light is transmitted to the light path control unit after passing through the ocular unit, the light in the second waveband forms a corresponding first light path in the first light path control mode, and the light in the second waveband enters the imaging unit for imaging after passing through the light filtering unit along the first light path.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. An eye-tracking optical system, comprising: a light source unit, an eyepiece unit, and a light path control unit;
the light source unit is used for emitting light rays with specified wavelength, and the light rays can enter eyes of a user; the eyepiece unit is arranged relative to the eyes of the user, and the light source unit is arranged at the edge of the eyepiece unit; the eyepiece unit is arranged between the eyes and the light path control unit; the light path control unit is arranged on a light path of light emitted by the eyepiece unit and forms a certain included angle with an optical axis; forming a corresponding first light path in a first light path control mode and a corresponding second light path in a second light path control mode at the same time in the light path control unit;
the optical path control unit includes a first optical element arranged to be able to form a corresponding first optical path in a first optical path control mode and a second optical element arranged to be able to form a corresponding second optical path in a second optical path control mode;
the second optical element is arranged at the outer ring of the first optical element;
the first optical element includes at least one of a dichroic mirror or a beam splitter;
the second optical element at least comprises one of a near-infrared absorption film system or a near-infrared transmission film system, and the near-infrared absorption film system or the near-infrared transmission film system is used for transmitting visible light and preventing near-infrared light from reflecting;
the first optical path control mode is set to transmit light of a first wavelength band and reflect light of a second wavelength band, wherein the first optical path is an optical path reflected in the first optical path control mode; the second optical path control mode is set to be transmissive to light of the first wavelength band and transmissive or absorptive to light of a second wavelength band, wherein the second optical path is an optical path transmitted by light of the first wavelength band in the second optical path control mode;
the light of the second wavelength band is near-infrared light.
2. The system of claim 1, wherein the first and second optical elements are configured to have similar visible light transmittances.
3. The system of claim 1, wherein the first band of wavelengths of light is in the visible band of wavelengths; the light of the second wavelength band is in the near infrared wavelength band.
4. The system of claim 1, further comprising: a light filtering unit;
the filtering unit is arranged on the first light path and used for filtering the light of the first wave band.
5. The system of claim 4, further comprising: an imaging unit;
the imaging unit is arranged behind the filtering unit and used for receiving the light with the second waveband filtered by the filtering unit so as to image eyes and the light source.
6. A head-mounted device comprising the eye tracking optical system of any one of claims 1-5 and a display screen;
the display screen is a multi-dimensional display screen and is used for displaying multi-dimensional images.
7. An imaging method, comprising:
the light with the appointed wavelength emitted by the light source unit is irradiated into the eyes of the user;
light reflected by the user's eyes is transmitted to the light path control unit through the eyepiece unit;
the light transmitted to the light path control unit forms a corresponding first light path under the first light path control mode and forms a corresponding second light path under the second light path control mode at the same time; the light path control unit is arranged on a light path of light emitted by the eyepiece unit and forms a certain included angle with an optical axis;
the optical path control unit includes a first optical element arranged to be able to form a corresponding first optical path in a first optical path control mode and a second optical element arranged to be able to form a corresponding second optical path in a second optical path control mode;
the second optical element is arranged at the outer ring of the first optical element;
the first optical element includes at least one of a dichroic mirror or a beam splitter;
the second optical element at least comprises one of a near-infrared absorption film system or a near-infrared transmission film system, and the near-infrared absorption film system or the near-infrared transmission film system is used for transmitting visible light and preventing near-infrared light from reflecting;
the first optical path control mode is set to transmit light of a first wavelength band and reflect light of a second wavelength band, wherein the first optical path is an optical path reflected in the first optical path control mode; the second optical path control mode is set to be transmissive to light of the first wavelength band and transmissive or absorptive to light of a second wavelength band, wherein the second optical path is an optical path transmitted by light of the first wavelength band in the second optical path control mode;
the light of the second wavelength band is near-infrared light.
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| CN114563871B (en) * | 2020-11-27 | 2023-04-11 | 华为技术有限公司 | Eye movement tracking device and electronic equipment |
| WO2023048984A1 (en) * | 2021-09-22 | 2023-03-30 | Kokanee Research Llc | Infrared coatings for gaze tracking systems |
| CN117310972A (en) * | 2022-06-21 | 2023-12-29 | 北京七鑫易维信息技术有限公司 | Eyeball tracking optical device, system and virtual reality equipment |
| CN117310976A (en) * | 2022-06-21 | 2023-12-29 | 北京七鑫易维信息技术有限公司 | Eyeball tracking optical system and head-mounted equipment |
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| CN205942608U (en) * | 2016-06-30 | 2017-02-08 | 上海青研科技有限公司 | A integration mirror cup that is used for eyeball to track and iris discernment |
| CN205942609U (en) * | 2016-06-30 | 2017-02-08 | 北京上古视觉科技有限公司 | VR glasses with eye accuse and iris recognition function |
| CN106932904A (en) * | 2017-02-27 | 2017-07-07 | 阿里巴巴集团控股有限公司 | Virtual reality helmet |
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| TWI507762B (en) * | 2013-05-31 | 2015-11-11 | Pixart Imaging Inc | Eye tracking device and optical assembly thereof |
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| CN205942608U (en) * | 2016-06-30 | 2017-02-08 | 上海青研科技有限公司 | A integration mirror cup that is used for eyeball to track and iris discernment |
| CN205942609U (en) * | 2016-06-30 | 2017-02-08 | 北京上古视觉科技有限公司 | VR glasses with eye accuse and iris recognition function |
| CN106932904A (en) * | 2017-02-27 | 2017-07-07 | 阿里巴巴集团控股有限公司 | Virtual reality helmet |
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