CN108362479B - Virtual image distance measuring system and virtual image distance determining method - Google Patents
Virtual image distance measuring system and virtual image distance determining method Download PDFInfo
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Abstract
The invention provides a virtual image distance measuring system and a virtual image distance determining method. The system comprises a shooting device, a reference object and a measuring device; the shooting device is used for focusing the virtual object in a preset mode when the shooting device is located at the first shooting position, so that the virtual object can be clearly imaged in the shooting device; the reference object is used for moving along the optical axis when the shooting device is in the second shooting position and in a focusing state until clear imaging is carried out in the shooting device; and the measuring device is used for calibrating the distance between the reference object and the shooting device when the reference object clearly images in the shooting device, and the distance is the virtual image distance of the virtual object. The method for determining the image distance of the virtual image is simple and easy to operate, can meet the detection and correction requirements of display equipment such as virtual reality equipment and augmented reality equipment, and solves the problem that the requirement for equipment for determining the image distance of the virtual image in the prior art is high.
Description
Technical Field
The invention relates to the technical field of virtualization, in particular to a virtual image distance measuring system and a virtual image distance determining method.
Background
Images of display devices such as Virtual Reality (VR) and Augmented Reality (AR) are Virtual images, and measurement of the image distance of the Virtual images is very important. Since the virtual image distance directly affects the effects of the anti-distortion and spatial position depth, it is visually perceived by the consumer closest to the display device. If the virtual image distance is incorrect, the matching of software and hardware parameters and the final effect of the display equipment can be directly influenced.
Currently, the following methods are mainly used for determining the virtual image distance: 1. and obtaining the virtual image distance according to an imaging formula of the optical system. 2. And photographing the display equipment in a transmission mode, and obtaining the object distance and the virtual image distance through image processing. 3. And (4) shooting binocular pictures at human eyes, and calculating the virtual image distance through the stereoscopic vision convergence angle. The defects of the above schemes are that the requirements on equipment are high, for example, the requirements on the assembly precision of a pair of optical systems are high, the requirements on two pairs of equipment for irradiating short-wave light are high, and the requirements on the construction of three pairs of equipment for shooting three-dimensional sight lines are high. Therefore, finding a method for determining the virtual image distance with low requirements on equipment becomes an urgent technical problem to be solved.
Disclosure of Invention
The invention provides a virtual image distance measuring system and a virtual image distance determining method, which aim to solve the problem that the requirement for equipment for determining the virtual image distance in the prior art is high.
In order to solve the above problems, an embodiment of the present invention discloses a virtual image distance measuring system, which is configured to measure a virtual image distance of a virtual object displayed by a display device, and includes a shooting device, a reference object, and a measuring device;
the photographing apparatus has a first photographing position at which the display device is located on an optical axis of the photographing apparatus and a second photographing position; in the second shooting position, the reference object is located on the optical axis of the shooting device;
the shooting device is used for focusing the virtual object in a preset mode when the shooting device is located at the first shooting position, so that the virtual object can be clearly imaged in the shooting device;
the reference object is used for moving along the optical axis when the shooting device is at a second shooting position and in a focusing state until clear imaging is carried out in the shooting device;
the measuring device is used for calibrating the distance between the reference object and the shooting device when the reference object is clearly imaged in the shooting device, and the distance is the virtual image distance of the virtual object.
Optionally, the system further comprises a guide rail, the photographing device is arranged on the guide rail, and the guide rail is perpendicular to the optical axis of the photographing device;
the photographing device is movable along the guide rail between the first photographing position and the second photographing position.
Optionally, the system further comprises a rotating table on which the photographing device is fixed;
the shooting device can rotate along with the rotating platform and is switched between the first shooting position and the second shooting position.
Optionally, the heights of the display device, the camera and the reference object are the same.
Optionally, the shooting parameters of the shooting device in the preset mode are a longest focal length and a largest aperture.
In order to solve the above problem, an embodiment of the present invention further discloses a method for determining an image distance of a virtual image, which is applied to the above system for measuring an image distance of a virtual image;
the method comprises the following steps:
focusing a virtual object displayed by display equipment in a preset mode when a shooting device is located at a first shooting position, so that the virtual object can be clearly imaged in the shooting device;
when the shooting device is at a second shooting position and in a focusing state, moving a reference object along the optical axis until the reference object is clearly imaged in the shooting device;
and when the reference object is calibrated to be clearly imaged in the shooting device by adopting a measuring device, the distance between the reference object and the shooting device is the virtual image distance of the virtual object.
Optionally, the photographing device is disposed on a guide rail, the guide rail being perpendicular to an optical axis of the photographing device;
prior to said moving the reference object along the optical axis, the method further comprises:
and moving the shooting device along the guide rail to move the position of the shooting device from the first shooting position to the second shooting position.
Optionally, the shooting device is fixed on a rotating platform;
prior to said moving the reference object along the optical axis, the method further comprises:
and rotating the rotating platform to switch the position of the shooting device from the first shooting position to the second shooting position.
Optionally, the heights of the display device, the camera and the reference object are the same.
Optionally, the shooting parameters of the shooting device in the preset mode are a longest focal length and a largest aperture.
Compared with the prior art, the invention has the following advantages:
the virtual image distance measuring system is used for measuring the virtual image distance of a virtual object displayed by the display equipment and comprises a shooting device, a reference object and a measuring device; the photographing apparatus has a first photographing position where the display device is located on an optical axis of the photographing apparatus and a second photographing position; in a second shooting position, a reference object is positioned on the optical axis of the shooting device; when the shooting device is located at the first shooting position, the virtual object is focused in a preset mode, so that the virtual object can be clearly imaged in the shooting device, namely, the virtual image distance is obtained through the shooting device. When the shooting device is in the second shooting position and in a focusing state, the reference object moves along the optical axis until the reference object clearly images in the shooting device, namely, the virtual image distance obtained by the shooting device is converted into the distance between the reference object and the shooting device. The measuring device calibrates the distance between the reference object and the shooting device when the reference object clearly images in the shooting device, and the distance is the virtual image distance of the virtual object. In the embodiment of the invention, the virtual image distance of the virtual object is converted into the distance between the reference object and the shooting device through the shooting device, so that the method for determining the virtual image distance is simple and easy to operate, the detection and correction requirements of display equipment such as virtual reality equipment and augmented reality equipment can be met, and the problem that the requirement for the equipment for determining the virtual image distance in the prior art is high is solved.
Drawings
Fig. 1 is a schematic structural diagram of a virtual image distance measurement system according to a first embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a virtual image distance measuring system according to a first embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a virtual image distance measuring system according to a first embodiment of the present invention;
fig. 4 is a flowchart illustrating steps of a method for determining an image distance of a virtual image according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
Referring to fig. 1, a schematic structural diagram of a virtual image distance measurement system according to an embodiment of the present invention is shown. The virtual image distance measuring system is used for measuring the virtual image distance of a virtual object displayed by the display device 20, and comprises a shooting device 101, a reference object 102 and a measuring device 103;
the camera 101 has a first shooting position S1 and a second shooting position S2, and the display device 20 is located on the optical axis of the camera 101 at the first shooting position S1; in the second photographing position S2, the reference object 102 is located on the optical axis of the photographing device 101;
the shooting device 101 is configured to focus the virtual object in a preset mode when the shooting device 101 is located at the first shooting position S1, so that the virtual object is clearly imaged in the shooting device 101;
the reference object 102 is configured to move along the optical axis until clear imaging is performed in the camera 101 when the camera 101 is in the second shooting position S2 and in a focus state;
the measuring device 103 is configured to calibrate a distance between the reference object 102 and the shooting device 101 when the reference object 102 is clearly imaged in the shooting device 101, where the distance is a virtual image distance of the virtual object.
In this embodiment, the display device 20 displays a virtual object, and the display device 20 includes, but is not limited to, a virtual reality device and an augmented reality device.
The virtual image distance measuring system is used for measuring the virtual image distance of a virtual object, the system comprises a shooting device 101, a reference object 102 and a measuring device 103, and the shooting device 101 can be switched between a first shooting position S1 and a second shooting position S2. When the photographing device 101 is at the first photographing position S1, the display apparatus 20 is located on the optical axis of the photographing device 101; when the photographing device 101 is at the second photographing position S2, the reference object 102 is located on the optical axis of the photographing device 101. The camera 101 includes, but is not limited to, a camera, and the optical axis of the camera 101 may be the optical axis of the camera lens.
When the photographing device 101 is in the first photographing position S1, the virtual object is focused in the preset mode so that the virtual object is clearly imaged in the photographing device 101. Optionally, the shooting parameters of the shooting device 101 in the preset mode are the longest focal length and the largest aperture. Wherein, the focal length and the aperture are important factors influencing the Depth of Field (DOF), and the longer the focal length is, the shallower the Depth of Field is; the larger the aperture, the shallower the depth of field. Therefore, in the preset mode of longest focal length and largest aperture, the shallowest depth of field can be obtained. Depth of field refers to the range of distance between the front and back of a subject measured at the front edge of a camera lens or other imager where a sharp image can be obtained. Specifically, after the focusing is completed, a clear image can be formed in a range before and after the focal point, and this range of distance in front and behind is called the depth of field. When the depth of field is shallow, the distance range between the front and the back of the shot object is small, so that the position of the shot object can be determined more accurately. That is, in the present embodiment, when the depth of field is shallow and the virtual object is clearly imaged, the virtual image distance of the virtual object can be accurately obtained.
When the photographing device 101 is in the second photographing position S2 and the same in-focus state as described above, the reference object 102 is moved along the optical axis until clear imaging is performed in the photographing device 101. It can be understood that when the reference object 102 is clearly imaged in the camera 101, the virtual image distance of the virtual object is converted into the distance between the reference object 102 and the camera 101.
At this time, the distance between the reference object 102 and the photographing device 101 is calibrated by using the measuring device 103, so that the virtual image distance of the virtual object can be obtained. The measuring device 103 may be a ruler or an infrared distance measuring device, which is not limited in detail in the embodiment of the present invention and may be set according to actual situations.
Optionally, referring to the schematic structural diagram of the virtual image distance measuring system shown in fig. 2, the system further includes a guide rail 104, the photographing device 101 is disposed on the guide rail 104, and the guide rail 104 is perpendicular to the optical axis of the photographing device 101;
the photographing device 101 is movable along the guide rail 104 between the first photographing position S1 and the second photographing position S2.
In the present embodiment, the switching of the photographing device 101 between the first photographing position S1 and the second photographing position S2 may be achieved by the guide rail 104. Specifically, the photographing device 101 is disposed on the guide rail 104, and the photographing device 101 moves along the guide rail 104. The guide rail 104 is perpendicular to the optical axis of the photographing device 101, so that the accuracy of the virtual image distance can be ensured.
Optionally, referring to the schematic structural diagram of the virtual image distance measuring system shown in fig. 3, the system further includes a rotating platform 105, and the photographing device 101 is fixed on the rotating platform 105;
the imaging device 101 is rotatable with the rotary table 105, and is switched between the first imaging position S1 and the second imaging position S2.
In the present embodiment, the imaging device 101 can be switched between the first imaging position S1 and the second imaging position S2 by the rotating table 105. Specifically, the imaging device 101 is fixed to the rotary table 105, and when the rotary table 105 is rotated, the imaging device 101 can be rotated with the rotary table 105, thereby achieving the position switching. The rotation angle of the rotation table may be 180 ° or 90 °, which is not limited in detail in the embodiment of the present invention and may be set according to actual conditions.
Optionally, the heights of the display device 20, the camera 101 and the reference object 102 are the same.
In this embodiment, the display device 20, the camera 101, and the reference object 102 are at the same height, so that the imaging effect can be ensured, and the accuracy of the virtual image distance can be ensured.
In summary, in the embodiment of the present invention, the virtual image distance measuring system is configured to measure a virtual image distance of a virtual object displayed by the display device, and the system includes a shooting device, a reference object, and a measuring device; the photographing apparatus has a first photographing position where the display device is located on an optical axis of the photographing apparatus and a second photographing position; in a second shooting position, a reference object is positioned on the optical axis of the shooting device; when the shooting device is located at the first shooting position, the virtual object is focused in a preset mode, so that the virtual object can be clearly imaged in the shooting device, namely, the virtual image distance is obtained through the shooting device. When the shooting device is in the second shooting position and in a focusing state, the reference object moves along the optical axis until the reference object clearly images in the shooting device, namely, the virtual image distance obtained by the shooting device is converted into the distance between the reference object and the shooting device. The measuring device calibrates the distance between the reference object and the shooting device when the reference object clearly images in the shooting device, and the distance is the virtual image distance of the virtual object. In the embodiment of the invention, the virtual image distance of the virtual object is converted into the distance between the reference object and the shooting device through the shooting device, so that the method for determining the virtual image distance is simple and easy to operate, the detection and correction requirements of display equipment such as virtual reality equipment and augmented reality equipment can be met, and the problem that the requirement for the equipment for determining the virtual image distance in the prior art is high is solved.
Example two
Referring to fig. 4, a flowchart illustrating steps of a method for determining an image distance of a virtual image according to an embodiment of the present invention is shown. The method is applied to the virtual image distance measuring system according to the first embodiment, and includes:
in step 301, when the photographing device 101 is at the first photographing position S1, the virtual object displayed on the display device 20 is focused in the preset mode, so that the virtual object is clearly imaged in the photographing device 101.
In this embodiment, the display device 20 displays a virtual object, when the camera 101 is at the first shooting position S1, the display device 20 is located on the optical axis of the camera 101, the camera 101 focuses on the virtual object in the preset mode, and the virtual object is clearly imaged in the camera 101.
Optionally, the shooting parameters of the shooting device 101 in the preset mode are the longest focal length and the largest aperture. That is, focusing is performed with the shallowest depth of field in the preset mode, so that an accurate virtual image distance of the virtual object is obtained by the photographing device 101.
In the present embodiment, the photographing device 101 is switched to the second photographing position S2 in the same in-focus state as described above, and the reference object 102 is moved along the optical axis so that the reference object 102 is clearly imaged in the photographing device 101. At this time, the virtual image distance of the virtual object is converted into the distance between the reference object 102 and the imaging device 101 by the imaging device 101.
Optionally, the camera 101 is disposed on a guide rail 104, and the guide rail 104 is perpendicular to an optical axis of the camera 101; moving the camera 101 along the guide 104 moves the position of the camera 101 from the first photographing position S1 to the second photographing position S2.
Specifically, the camera 101 is disposed on the guide rail 104, and the camera 101 is movable along the guide rail 104, thereby achieving switching of the camera 101 between the first shooting position S1 and the second shooting position. The guide rail 104 is perpendicular to the optical axis of the photographing device 101, and accuracy of the virtual image distance can be ensured.
Optionally, the photographing device 101 is fixed on the rotating platform 105; the rotary table 105 is rotated to switch the position of the imaging device 101 from the first imaging position S1 to the second imaging position S2.
Specifically, the photographing device 101 is fixed on the rotating table 105, and the photographing device 101 can rotate with the rotating table 105, thereby switching the photographing device 101 between the first photographing position S1 and the second photographing position S2. The rotation angle of the rotating table in the embodiment of the invention is not limited in detail, and can be set according to actual conditions.
Optionally, the heights of the display device 20, the camera 101 and the reference object 102 are the same.
Specifically, the display device 20, the camera 101, and the reference object 102 are at the same height, ensuring the imaging effect of the virtual object and the reference object 102 imaged in the camera 101, thereby ensuring the accuracy of the virtual image distance.
In this embodiment, when the reference object 102 is clearly imaged in the photographing device 101, the distance between the reference object 102 and the photographing device 101 is a virtual image distance of the virtual object. The measuring device 103 according to the embodiment of the present invention is not limited in detail, and may be set according to actual situations.
In summary, in the embodiment of the present invention, when the shooting device is located at the first shooting position, the virtual object displayed by the display device is focused in the preset mode, so that the virtual object is clearly imaged in the shooting device, that is, the virtual image distance is obtained by the shooting device; when the shooting device is at the second shooting position and in a focusing state, the reference object is moved along the optical axis until the reference object is clearly imaged in the shooting device, namely, the virtual image distance is converted into the distance between the reference object and the shooting device through the shooting device; and calibrating the distance between the reference object and the shooting device when the reference object is clearly imaged in the shooting device by adopting the measuring device, wherein the distance is the virtual image distance of the virtual object. The virtual image distance of the virtual object is converted into the distance between the reference object and the shooting device through the shooting device, so that the method for determining the virtual image distance is simple and easy to operate, the detection and correction requirements of display equipment such as virtual reality equipment and augmented reality equipment can be met, and the problem that the requirement for the equipment for determining the virtual image distance in the prior art is high is solved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The virtual image distance measuring system and the virtual image distance determining method provided by the invention are described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiment is only used to help understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A virtual image distance measurement system is characterized in that the virtual image distance measurement system is used for measuring the virtual image distance of a virtual object displayed by a display device, and comprises a shooting device, a reference object and a measuring device;
the photographing apparatus has a first photographing position at which the display device is located on an optical axis of the photographing apparatus and a second photographing position; in the second shooting position, the reference object is located on the optical axis of the shooting device;
the shooting device is used for focusing the virtual object in a preset mode when the shooting device is located at the first shooting position, so that the virtual object can be clearly imaged in the shooting device;
the reference object is used for moving along the optical axis when the shooting device is at a second shooting position and in a focusing state until clear imaging is carried out in the shooting device;
the measuring device is used for calibrating the distance between the reference object and the shooting device when the reference object is clearly imaged in the shooting device, and the distance is the virtual image distance of the virtual object;
the shooting parameters of the shooting device in the preset mode are the longest focal length and the largest aperture;
the system further comprises a guide rail, the shooting device is arranged on the guide rail, and the guide rail is perpendicular to the optical axis of the shooting device;
the photographing device is movable along the guide rail between the first photographing position and the second photographing position.
2. The system of claim 1, further comprising a rotating stage on which the camera is fixed;
the shooting device can rotate along with the rotating platform and is switched between the first shooting position and the second shooting position.
3. The system of claim 1, wherein the display device, the camera, and the reference object are the same height.
4. A method for determining the image distance of a virtual image is characterized by being applied to a virtual image distance measuring system as described in any one of 1-3;
the method comprises the following steps:
focusing a virtual object displayed by display equipment in a preset mode when a shooting device is located at a first shooting position, so that the virtual object can be clearly imaged in the shooting device;
when the shooting device is at a second shooting position and in a focusing state, moving a reference object along the optical axis until the reference object is clearly imaged in the shooting device;
calibrating the distance between the reference object and the shooting device when the reference object is clearly imaged in the shooting device by adopting a measuring device, wherein the distance is the virtual image distance of the virtual object;
the shooting parameters of the shooting device in the preset mode are the longest focal length and the largest aperture;
the shooting device is arranged on a guide rail, and the guide rail is perpendicular to an optical axis of the shooting device;
prior to said moving the reference object along the optical axis, the method further comprises:
and moving the shooting device along the guide rail to move the position of the shooting device from the first shooting position to the second shooting position.
5. The method of claim 4, wherein the camera is fixed to a rotating table;
prior to said moving the reference object along the optical axis, the method further comprises:
and rotating the rotating platform to switch the position of the shooting device from the first shooting position to the second shooting position.
6. The method of claim 4, wherein the display device, the camera, and the reference object are the same height.
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| CN110057552B (en) * | 2019-04-23 | 2020-11-06 | 芋头科技（杭州）有限公司 | Virtual image distance measuring method, device, equipment, controller and medium |
| CN110336996B (en) * | 2019-06-27 | 2021-03-30 | 歌尔光学科技有限公司 | Virtual image distance testing method and device, head-mounted equipment and computer readable storage medium |
| CN113395439A (en) * | 2020-03-13 | 2021-09-14 | 深圳惠牛科技有限公司 | Virtual image distance measuring method, system, device and terminal equipment |
| CN112326205A (en) * | 2020-10-30 | 2021-02-05 | 歌尔光学科技有限公司 | Virtual image distance detection tool, calibration method thereof and virtual image distance detection method |
| CN112763186A (en) * | 2020-11-19 | 2021-05-07 | 塔普翊海（上海）智能科技有限公司 | Virtual image distance measuring system and method |
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| CN107454377B (en) * | 2016-05-31 | 2019-08-02 | 深圳市微付充科技有限公司 | A kind of algorithm and system carrying out three-dimensional imaging using camera |
| CN106127714B (en) * | 2016-07-01 | 2019-08-20 | 南京睿悦信息技术有限公司 | A kind of measurement method of virtual reality head-mounted display equipment distortion parameter |
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