CN111678674A - Near-eye display measurement method and near-eye display measurement system - Google Patents
Near-eye display measurement method and near-eye display measurement system Download PDFInfo
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- CN111678674A CN111678674A CN202010526517.XA CN202010526517A CN111678674A CN 111678674 A CN111678674 A CN 111678674A CN 202010526517 A CN202010526517 A CN 202010526517A CN 111678674 A CN111678674 A CN 111678674A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of near-eye display, in particular to a near-eye display measuring method and a near-eye display measuring system. The near-eye display measurement system comprises an image shooting device, a position measurement device, a position adjusting mechanism, an image shooting supporting mechanism, a near-eye display assembly to be measured, a module supporting mechanism to be measured and a main control device; the image shooting device is in communication connection with the main control device and is arranged on the image shooting supporting mechanism; the near-eye display measuring method is used for measuring the image interference degree of the display image of the near-eye display measuring system.
Description
Technical Field
The invention relates to the technical field of near-eye display, in particular to a near-eye display measuring method and a near-eye display measuring system.
Background
Currently, near-eye display devices, such as virtual reality display devices and augmented reality display devices, are developing towards being light and thin, and an optical display module in the near-eye display device, as shown in fig. 2, is a refraction and reflection type near-eye display module, which includes an image display device 31 and an optical path folding group 32, wherein the optical path folding group includes an anti-permeable element 321, an 1/4 phase retardation element 322, a polarization transflective element 323 and an imaging lens group 324, and the optical path is reflected twice between the anti-permeable element and the polarization transflective element by adopting a 1/4 phase retardation element and a polarization transflective element, so that the folding of the optical path is achieved, and the thickness of the module is reduced. However, since the 1/4 phase delay elements have different phase delay amounts for light beams of different wavelengths, an image on the image display device is projected as a double virtual image after passing through the optical path folding group, where the virtual image projected after the optical path folding group is folded and reflected (indicated by a solid line in fig. 2) is a main virtual image, and the virtual image projected by the direct transmission optical path folding group (indicated by a dotted line in fig. 2) is an interference virtual image, and when the ratio of the interference virtual image to the main virtual image is an interference degree, the user experience will be seriously affected when the interference degree is too large. Because the interference virtual image and the main virtual image are both virtual images and exist on the emergent end side of the near-eye display module at the same time, the separation test cannot be performed, and therefore a method or a system for effectively measuring the interference degree of the near-eye display module is urgently needed.
Disclosure of Invention
In view of the above, the present invention provides a near-eye display measurement method and a near-eye display measurement system to solve the above problems.
The near-eye display measurement method provided by the embodiment of the invention is applied to a near-eye display measurement system, wherein the near-eye display measurement system comprises an image shooting device, a position measurement device, a position adjustment mechanism, an image shooting support mechanism, a near-eye display component to be measured, a module support mechanism to be measured and a main control device; the image shooting device is in communication connection with the main control device and is arranged on the image shooting supporting mechanism; the near-to-eye display assembly to be tested is arranged on the module supporting mechanism to be tested, and the method comprises the following steps:
step S1: the position measuring device measures the spatial position of the near-to-eye display component to be measured relative to the image shooting device, and adjusts the image shooting supporting mechanism and/or the module supporting mechanism to be measured, so that the distance between the optical entrance pupil of the image shooting device and the near-to-eye display component to be measured is the distance value of the exit pupil to be measured, the shooting optical axis of the image shooting device is parallel to the optical axis of the near-to-eye display component to be measured, and the distance between the shooting optical axis of the image shooting device and the optical axis of the near-to-;
step S2: setting an image display of a near-eye display component to be tested to display preset image information;
step S3: setting an image shooting device to clearly image a main virtual image projected by a near-eye display assembly to be detected, and acquiring a main shooting image corresponding to the main virtual image; setting an image shooting device to clearly image an interference virtual image projected by a near-eye display assembly to be detected, and acquiring an interference shooting image corresponding to the interference virtual image;
step S4: the main control device respectively carries out image calculation processing on the main shot image and the interference shot image to obtain the brightness information of the main virtual image and the brightness information of the interference virtual image, and calculates the image interference degree according to the obtained brightness information;
step S5: the master control device outputs the image interference degree.
Optionally, after step S4, the method further includes:
step S41: if the measurement in the state of the other optical axis deviation distance values and/or the exit pupil distance value needs to be measured, it returns to step S1, otherwise, step S5 is performed.
The invention also provides a near-to-eye display measurement system, which comprises an image shooting device, a position measurement device, a position adjusting mechanism, an image shooting supporting mechanism, a near-to-eye display component to be measured, a module supporting mechanism to be measured and a main control device, the position measuring device is used for measuring the spatial position of the near-eye display component to be measured relative to the image shooting device, the image shooting device is arranged on the image shooting supporting mechanism, the near-to-eye display component to be tested is arranged on the module supporting mechanism to be tested, the near-eye display component to be tested projects preset image information into a main virtual image and an interference virtual image which are not overlapped with each other, the image shooting device shoots a virtual image projected by the near-eye display component to be detected to obtain a main shooting image and an interference shooting image, and the main control device processes and calculates the main shooting image and the interference shooting image to obtain the image interference degree of the near-eye display component to be detected.
Optionally, the preset image information is at least one group of image information including a preset image unit, the preset image unit in each group of image information includes a non-pattern region and a pattern region, and a maximum equivalent size S1 of an inner boundary of the pattern region and a maximum equivalent size S2 of an outer boundary of the pattern region satisfy a relationship:
S1*β1＞K*(S2*β2)
wherein: beta 1 and beta 2 are respectively the image magnification in the main virtual image light path and the image magnification in the interference virtual image light path of the near-eye display module to be tested, and K is a coefficient larger than 1.
Further, the preset image information is at least one group of image information including a plurality of preset image units, the preset image units in each group of image information are non-overlapped with each other, and each preset image unit includes a non-pattern region and a pattern region, and a maximum equivalent size S1 of an inner boundary of the pattern region and a maximum equivalent size S2 of an outer boundary of the pattern region satisfy a relationship:
wherein: beta 1, beta 2 and L91 are respectively the image magnification in the main virtual image light path of the near-eye display module to be tested, the image magnification in the interference virtual image light path, the center of the boundary of the preset image unit to the central point of the display area of the image display in the near-eye display module to be tested.
Optionally, the pattern area in the preset image unit is a solid color.
Optionally, the preset image information is preset on the near-eye display assembly to be detected.
Optionally, the preset image information is preset on the main control device.
Optionally, the image capturing device is specifically a zoom camera device.
Optionally, the image capturing device is specifically a fixed-focus image capturing device, a minimum shooting distance of the fixed-focus image capturing device is not greater than 30mm, and a maximum shooting distance of the fixed-focus image capturing device is not less than 1 m.
The near-eye display measurement method provided by the invention can reliably and effectively measure the image interference degree of the display virtual image of the refraction-reflection type near-eye display module, and can provide judgment support for judging the quality of the display image of the refraction-reflection type near-eye display module.
The near-eye display measurement system provided by the embodiment of the invention adopts the measurement method to measure the image interference degree, thereby having similar beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.
Fig. 1 is a schematic structural diagram of a near-eye display measurement system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a near-eye display device under test.
Fig. 3 is a flowchart of a near-eye display measurement method according to the present invention.
Fig. 4 is a schematic diagram of preset image information on an image display of a near-eye display assembly to be tested according to an embodiment of the invention.
Fig. 5 is a flowchart of another near-eye display measurement method provided by the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Referring to fig. 1, a near-eye display measurement system according to an embodiment of the present invention includes an image capturing device 10, an image capturing supporting mechanism 20, a near-eye display component 30 to be measured, a module supporting mechanism 40 to be measured, a position measurement device, a position adjustment mechanism, and a main control device (not shown). The image shooting device 10 is arranged on the image shooting supporting mechanism 20 and can be connected with the main control device in a communication way; the near-to-eye display module to be tested 30 is disposed on the module supporting mechanism to be tested 40.
The near-eye display module 10 to be tested may be a single near-eye display module, as shown in fig. 2, and includes an image display device 31, an optical path folding module 32, a display control module (not shown in the figure), and a connection structure (not shown in the figure). The optical path folding module 32 generally includes reflective elements 321, 1/4, a phase retardation element 322, a polarization reflective element 323, and an imaging lens 324. At least one of the transflective element 321 and the imaging lens 324 is an optical element that is in focus. The reflective and transmissive element 321 may be a flat-type afocal transflective optical element, or a focal transflective optical element, such as a plano-convex lens with a semi-reflective and semi-transmissive film layer disposed on the convex surface, and the imaging lens 324 may be a focal transmissive optical element, such as a convex lens or a fresnel lens, or a flat-type afocal transmissive optical element, such as a flat glass substrate.
The image emitted from the image display 31 passes through the optical path folding module 32 and then forms two virtual images, a main virtual image and an interference virtual image, on the observation side (the side where the eyes are located in fig. 2).
The optical path of the primary virtual image runs (indicated by the solid line in fig. 2): the image emitted from the image display device 31 passes through the phase retardation element 322 of the transflective element 321 and 1/4, is reflected by the polarization transflective element 323, passes through the phase retardation element 1/4 again, is reflected by the transflective element 321, and the reflected image beam passes through the 1/4 phase retardation element 322, the polarization transflective element 323, and the imaging lens 324 again to form a main virtual image.
The optical path of the virtual interference image runs (indicated by the dashed line in fig. 2): the image from the image display 31 directly passes through the phase retardation element 322 of the reflective transparent element 321, 1/4, the polarization reflective element 323 and the imaging lens 324 to form an interference virtual image.
The interference virtual image causes interference to the observation of the main virtual image by the user through the near-eye display assembly. And recording the ratio of the energy of the interference virtual image to the energy of the main virtual image as an image interference degree, wherein the image interference degree directly influences the contrast of the main virtual image observed by the user. In the main virtual image path, the path is folded in order by reflection between the transflective element 321 and the polarization transflective element 323, with a folded optical path length of 2 × Δ L. In the optical path of the interference virtual image, the optical path is not folded, and therefore, the size and distance of the main virtual image after the image display device 31 passes through the optical path folding module 32 are not consistent with those of the interference virtual image.
The image display device can be a non-transparent display device, such as an OLED (organic light emitting diode), an LCD (liquid crystal display) screen and the like, external environment light cannot penetrate through the image display device and the light path folding group, and the near-to-eye display assembly can be used as a virtual reality display assembly. The image display device 31 may also be a transparent display device, such as a transparent OLED, and ambient light will be able to pass through the transparent OLED display device and the light path folding assembly, and at this time, the near-to-eye display assembly may be used as an augmented reality display assembly.
The near-eye display assembly 30 to be tested may also be a near-eye display device including a single or two near-eye display modules as shown in fig. 2, and the near-eye display device generally further includes a control module, a speaker, a housing, a mask, a head-mount and a connecting structure for connecting these components together.
The position measuring device is used for measuring the spatial position of the near-eye display assembly 30 to be measured relative to the image capturing device 10, and may specifically be a conventional measuring device that performs spatial position calculation by using a three-dimensional space measurement technique, such as a measuring device based on structured light, a measuring device based on binocular vision, or a device based on monocular vision measurement. The position measuring device may be disposed on the image capturing supporting mechanism 20 or on the module supporting mechanism 40. The position measuring device can be in communication connection with the master control device and sends the measured spatial position information of the near-eye display assembly 30 to be measured relative to the image shooting device 10 to the master control device; the position measuring device may also include a display module, such as a display screen, for displaying the spatial position information obtained by the measurement to the user.
The image capturing support mechanism 20 includes a position adjusting mechanism for adjusting the spatial position of the image capturing device 10 mounted thereon, and the position adjusting mechanism may be an N-axis adjusting table, where N is an integer greater than 1 and less than 6, such as a 6-axis displacement rotating table capable of performing position adjustment in 6 directions in space, a 3-axis displacement table capable of performing axial displacement adjustment in 3 directions in space, or a multi-axis adjusting table composed of a plurality of single-axis displacement tables and/or rotating tables, which is not limited herein. In one possible embodiment, the image capturing support mechanism 20 is configured to fixedly mount the image capturing device 10, and the module under test support mechanism 40 is configured with a position adjusting mechanism for adjusting the spatial position of the near-to-eye display assembly 30 under test mounted thereon. In another possible embodiment, the image capturing support mechanism 20 and the module under test support mechanism 40 are both provided with position adjusting mechanisms for adjusting the spatial positions of the image capturing device 10 and the near-to-eye display assembly 30.
The image capturing device 10 may be a zoom image capturing device or a fixed focus image capturing device, in which the minimum shooting distance of the fixed focus image capturing device is not greater than 30mm and the maximum shooting distance is not less than 1 m.
As shown in fig. 3, it is a flowchart of a near-eye display measurement method for measuring the image interference of the near-eye display device 30 to be measured according to the present invention.
Step S1: the position measuring device measures the spatial position of the near-to-eye display assembly 30 to be measured relative to the image shooting device 10, and adjusts the image shooting supporting mechanism 20 and/or the module supporting mechanism 30 to be measured, so that the distance between the optical entrance pupil of the image shooting device 10 and the near-to-eye display assembly 30 to be measured is the exit pupil distance value to be measured, the shooting optical axis of the image shooting device 10 is parallel to the optical axis of the near-to-eye display assembly 30 to be measured, and the distance between the two is the optical axis deviation distance value to be measured.
In the implementation, the image capturing device 10 may be calibrated by using a conventional camera calibration method to obtain the internal and external parameters of the image capturing device 10 and the position of the optical entrance pupil (indicated by Cbox in fig. 1) of the image capturing device 10. The exit pupil (Ebox in FIG. 1) of the near-eye display assembly 30 to be measured is typically designed to be at a distance L1 from the optical elements on the side of the exit end, as shown in FIG. 1, 8mm < L1<20 mm. The distance between the optical entrance pupil of the image capturing device 10 and the exit pupil of the near-eye display module 30 is LCE. The photographing optical axis O1G1 of the image photographing device 10 and the optical axis O2G2 of the near-eye display device under test (as shown in fig. 1) in step 1 are parallel and not equal to absolute parallel, but should be understood as being substantially parallel, and the distance between the photographing optical axis O1G1 of the image photographing device 10 and the optical axis O2G2 of the near-eye display device under test is Δ H.
In one possible embodiment, the module under test supporting mechanism 40 is used for fixing the near-eye display assembly 30 to be tested, and the position adjusting mechanism is disposed on the image capturing supporting mechanism 20 for adjusting the spatial position of the image capturing device 10. The position adjusting mechanism can be an adjusting mechanism in a manual adjusting mode and can also be an adjusting mechanism in an electric control adjusting mode. When the position adjusting mechanism is in a manual adjusting mode, the user can acquire the spatial position information of the near-eye display assembly 30 to be detected, which is sent to the main control device by the position measuring device, relative to the image shooting device 10 from the main control device, or acquire the spatial position information of the near-eye display assembly 30 to be detected, relative to the image shooting device 10 from the display module of the position measuring device, and according to the spatial position information, adjust the shooting optical axis of the image shooting device 10 and the optical axis of the near-eye display assembly to be detected to be parallel through an adjusting handle arranged on the position adjusting mechanism, and the distance Δ H between the two is the optical axis deviation distance value required by the user, and the distance LCE between the optical entrance pupil of the image shooting device 10 and the exit pupil of the near-eye display assembly 30 to be detected is the exit pupil distance value to be detected. Under the general condition, the optical axis deviation distance value to be measured can be set to be 1mm and the exit pupil distance value to be measured is set to be 12mm, and considering that the near-to-eye display component to be measured is in the actual use process, the binocular vision axis of a user can be usually deviated from the optical axis position of the near-to-eye display component to be measured and the distances from different user eyes to the near-to-eye display component to be measured are different, and the user can set the optical axis deviation distance value to be measured and the exit pupil distance value to be measured according to the actual use condition.
When the position adjusting mechanism is in an electric control adjusting mode, the position measuring device and the position adjusting mechanism are respectively in communication connection with the main control device, and default optical axis deviation distance values to be measured, such as 0mm, and exit pupil distance values to be measured, such as 10mm, are preset in the main control device. The user can also set the deviation distance value of the optical axis to be measured and the distance value of the exit pupil to be measured through a position adjusting mechanism control program preset on the main control device. The main control device controls the position adjusting mechanism to adjust the spatial position of the image capturing device 10 according to the spatial position information of the near-to-eye display component 30 to be measured relative to the image capturing device 10 sent by the position measuring device, so that the capturing optical axis of the image capturing device 10 is parallel to the optical axis of the near-to-eye display component 30 to be measured, the distance Δ H between the capturing optical axis of the image capturing device 10 and the optical axis of the near-to-eye display component to be measured is the deviation distance value of the optical axis to be measured, and the distance LCE between the optical entrance pupil of the image capturing device 10 and the exit pupil of the near-to-eye display component 30 to be measured is the exit pupil distance value to be.
In another possible embodiment, the position adjusting mechanism is disposed on the module supporting mechanism 40 to be measured, and adjusts the spatial position of the near-eye display assembly 30 to be measured, and the image capturing device 10 is fixedly disposed on the image capturing supporting mechanism 20. Similarly, the position adjustment mechanism may adjust the near-to-eye display module 30 to be measured in a manual adjustment manner or an electric control adjustment manner so that the shooting optical axis of the image shooting device 10 is parallel to the optical axis of the near-to-eye display module 30 to be measured, the distance Δ H between the two is the deviation distance value of the optical axis to be measured, and the distance LCE between the optical entrance pupil of the image shooting device 10 and the near-to-eye display module 30 to be measured is the exit pupil distance value to be measured. When the position adjusting mechanism is in an electric control adjusting mode, the position adjusting mechanism and the main control device can be connected in a communication mode.
In yet another possible embodiment, the image capturing support mechanism 20 and the module under test support mechanism 40 are each provided with a position adjusting mechanism for adjusting the spatial positions of the image capturing device 10 and the near-to-eye display assembly under test 30. The position adjusting mechanism can be a manual adjusting mode or an electric control adjusting mode, for example, the position adjusting mechanism arranged on the image capturing supporting mechanism 20 is a manual adjusting mode, the position adjusting mechanism arranged on the module to be measured supporting mechanism 40 is an electric control adjusting mode, the position adjusting mechanism can be in communication connection with a main control device, and a user can measure the position according to the main control position. The position adjusting mechanisms disposed on the image capturing and supporting mechanism 20 and the near-eye display module 30 to be measured may be both electrically controlled and connected to the main control device in a communication manner.
The near-to-eye display component 30 to be measured is adjusted so that the distance LCE between the optical entrance pupil of the image capturing device 10 and the near-to-eye display component 30 to be measured is the distance value of the exit pupil to be measured required by the user, and the distance Δ H between the capturing optical axis of the image capturing device 10 and the optical axis of the near-to-eye display component 30 to be measured is the deviation distance value of the optical axis to be measured required by the user. When the position adjusting mechanism is in an electric control adjusting mode, the module supporting mechanism 40 to be tested and the main control device are connected in a communication mode.
Step S2: and setting an image display of the near-eye display component to be tested to display preset image information.
The preset image information at least comprises a group of image information, the group of image information can be a preset image unit, the preset image unit comprises a non-pattern area and a pattern area, the preset image unit is projected into two layers of virtual images after being measured by the near-eye display assembly 30, the two layers of virtual images are respectively an interference virtual image and a main virtual image, the projection distances of the interference virtual image and the middle virtual image are different, and the pattern area in the main virtual image and the pattern area in the interference virtual image are not overlapped with each other.
As shown in fig. 4, which is a schematic diagram of preset image information on an image display of a near-eye display module to be measured, the preset image information shown in fig. 4 is a set of image information having one preset image unit, a is a pattern region, B is a non-pattern region, a boundary Line1 of the non-pattern region B in the preset image unit shown in (a) in fig. 4 is a circle, a boundary Line2 of the pattern region a is a circle, centers of the two circles are at an intersection point (shown by O in the figure) of an optical axis of the optical path folding module 32 and the image display 31, in general, the intersection point O is a midpoint of a display region of the image display 31, a maximum equivalent dimension S1 of the boundary Line1 is a radius of the circle boundary Line1, and a maximum equivalent dimension S2 of the boundary Line2 is a radius of the circle boundary Line 2. The boundary Line1 between the pattern region and the non-pattern region in the preset image unit shown in fig. 4 (b) is a rectangle, the outer boundary Line2 of the pattern region is a closed curve, in this case, the maximum equivalent size S1 of the boundary Line1 is the radius of a circle (shown by dotted lines) with O as the center, the minimum size from O to the boundary Line1 is the radius, the maximum equivalent size S2 of the boundary Line2 is the radius of a circle (shown by dotted lines) with O as the center, and the maximum size from O to the boundary Line2 is the radius. In order for the pattern region in the main virtual image and the pattern region in the interfering virtual image to have no overlap with each other, the maximum equivalent size S1 of the boundary where the pattern region meets the non-pattern region and the maximum equivalent size S2 of the outer boundary of the pattern region need to satisfy the following relationship:
S1*β1＞K*(S2*β2) (I)
wherein beta 1 and beta 2 are respectively the image magnification in the main virtual image light path and the image magnification in the interference virtual image light path of the near-eye display module to be tested, K is a coefficient larger than 1, and the preferable K is 1.5-5. The preset image unit shown in (c) of fig. 4 is deviated from the center point O, the boundaries Line1 and Line2 are regular circles, the center G91 of the circle is at a distance L91 from the center point O, the boundaries Line1 and Line2 may also be regular rectangles, as shown in (d) of the figure, the distance L91 from the center point O of the center G92 of the rectangle, the maximum equivalent size S1 of the boundary Line1 is the radius of the circle (shown by dotted Line in the figure) with the center G92 as the center, the minimum size from G92 to the boundary Line1 as the radius, the maximum equivalent size S2 of the boundary Line2 is the radius of the circle (shown by dotted Line in the figure) with the center G92 as the center, and the maximum size from G92 to the boundary Line2 as the radius. The boundaries Line1 and Line2 may also be regular equilateral triangles, as shown in (e) in the figure, the distance L91 from the center G93 of the triangle to the center point O, the maximum equivalent dimension S1 of the boundary Line1 is the radius of a circle (shown by dotted lines in the figure) with the center G93 as the center, the minimum dimension of the boundary Line 93 to the boundary Line1 as the radius, the maximum equivalent dimension S2 of the boundary Line2 is the radius of a circle (shown by dotted lines in the figure) with the center G93 as the center, and the maximum dimension of the boundary Line2 to the boundary Line 93 as the radius.
In order for the pattern region in the main virtual image and the pattern region in the interfering virtual image to have no overlap with each other, the maximum equivalent size S1 of the boundary where the pattern region meets the non-pattern region and the maximum equivalent size S2 of the outer boundary of the pattern region need to satisfy the following relationship:
wherein: beta 1, beta 2 and L91 are respectively the image magnification in the main virtual image light path of the near-eye display module to be tested, the image magnification in the interference virtual image light path, the center of the boundary of the preset image unit to the central point of the display area of the image display in the near-eye display module to be tested.
The pattern area may be a single color, such as red, or may be multiple colors, such as a gradient color including red, green, and blue, without limitation.
The set of image information may further include a plurality of preset image units, and the preset image units are not overlapped with each other, so that the main virtual images in the projection image of the preset image units passing through the near-eye display assembly 30 to be measured are not overlapped with each other. For example, a group of image information shown in (f) of fig. 4 includes 3 preset image units, each of which satisfies the above relation (2), and the 3 preset image units do not overlap with each other on the image display.
In one possible embodiment, the preset image information may be stored in the near-eye display assembly 30 to be tested, the near-eye display assembly 30 to be tested is configured to display the preset image information on the image display device, and the main control device controls the image shooting device to shoot the image. The preset image information in this case is a set of image information.
In another possible embodiment, the near-eye display module to be tested 30 and the main control device may be communicatively connected, the preset image information is stored in the main control device, and the main control device controls the near-eye display module to be tested 30 to display the preset image information. When the preset image information has a plurality of groups of image information, the main control device respectively transmits the plurality of groups of image information to the near-eye display assembly to be detected in sequence according to the preset image time interval, controls the image display of the display module to be detected to display the received image information in sequence, and controls the image shooting device 10 to shoot the image projected by the near-eye display assembly 30 to be detected in the preset image time interval. The preset image information may also be stored in the near-eye display assembly 30 to be tested, the main control device sends an image display command to the near-eye display assembly 30 to be tested, the image display of the near-eye display assembly 30 to be tested displays the preset image information, and the main control device controls the image shooting device 10 to shoot images. When the preset image information is a plurality of groups of image information, the near-to-eye display module 30 to be tested is set to sequentially display each group of image information in the plurality of groups of image information at a fixed time interval, and the main control device is set to sequentially control the image shooting device 10 to shoot images within the fixed time interval.
Step S3: setting an image shooting device to clearly image a main virtual image projected by a near-eye display assembly to be detected, and acquiring a main shooting image corresponding to the main virtual image; and setting an image shooting device to clearly image the interference virtual image projected by the near-eye display assembly to be detected, and acquiring an interference shooting image corresponding to the interference virtual image.
Step S4: the main control device respectively carries out image calculation processing on the main shot image and the interference shot image to obtain the brightness information of the main virtual image and the brightness information of the interference virtual image, and the image interference degree is calculated according to the obtained brightness information.
In a possible embodiment, the image capturing apparatus 10 is a zoom image capturing apparatus, preset image information on the image display 31 is projected to be an interference virtual image and a main virtual image after passing through the optical path folding group 32, the imaging distances of the interference virtual image and the main virtual image are not the same, the imaging distance of the main virtual image is generally 10 to 50 times the imaging distance of the interference virtual image, and clear imaging of the main virtual image and the interference virtual image can be achieved by zooming. In another possible embodiment, the image capturing apparatus 10 is a fixed-focus image capturing apparatus, the minimum shooting distance of the fixed-focus image capturing apparatus is not greater than 30mm, the maximum shooting distance of the fixed-focus image capturing apparatus is not less than 1m, the imaging distance of the interference virtual image is generally less than 50mm, and the imaging distance of the main virtual image is generally greater than 500mm, so that the fixed-focus image capturing apparatus can perform clear imaging shooting on the interference virtual image and the main virtual image respectively.
The main control device controls the image shooting device 10 to clearly shoot an interference virtual image and a main virtual image of preset image information projected by the near-eye display assembly 30 to be detected so as to obtain a corresponding interference shooting image and a corresponding main shooting image, and the interference shooting image and the main shooting image are subjected to image processing calculation so as to obtain the brightness of the corresponding interference virtual image and the brightness of the main virtual image.
When the preset image information is a group of image information containing one preset image unit, the main control device processes and calculates the interference shooting image and the main shooting image to respectively obtain the brightness of the corresponding interference virtual image and the brightness of the main virtual image, and the brightness of the interference virtual image is divided by the brightness of the main virtual image to serve as the interference degree of the near-eye display assembly to be detected.
When the preset image information is a group of image information containing a plurality of preset image units, the main control device carries out brightness calculation on the shot image corresponding to each image unit in the interference shot image, when the brightness of the shot image corresponding to each image unit in the main shot image is calculated and the image interference degree is calculated, a manner may be adopted in which the sum of the luminances corresponding to the respective image units calculated based on the interference shot image is divided by the sum of the luminances corresponding to the respective image units calculated based on the main shot image, or calculating to obtain the image interference degree corresponding to each image unit by dividing the brightness calculated based on the interference shooting image corresponding to each image unit by the brightness calculated based on the main shooting image, and calculating to obtain the final image interference degree by common mathematical algorithms such as averaging or weighted averaging.
When the preset image information comprises a plurality of groups of image information and the plurality of groups of image information are the same color information, the main control device respectively calculates the image interference degree of each group of image information and then calculates the image interference degree of the color by adopting algorithms such as averaging, weighted averaging and the like.
The preset image information comprises a plurality of groups of image information, and when the plurality of groups of image information are different color information, if the three groups of image information are respectively red, green and blue image information, the main control device respectively calculates the image interference degree of each group of image information to obtain the image interference degrees of different colors.
Step S6: the master control device outputs the image interference degree.
The main control device can present the image interference degree of the near-eye display component 30 to be detected to the user in a table data mode or a graphic mode through a display module, such as a display screen.
Fig. 5 is a schematic flow chart of another near-eye display measurement method provided by the present invention.
Step S1: the position measuring device measures the spatial position of the near-to-eye display component to be measured relative to the image shooting device, and adjusts the image shooting supporting mechanism and/or the module supporting mechanism to be measured, so that the distance between the optical entrance pupil of the image shooting device and the near-to-eye display component to be measured is the distance value of the exit pupil to be measured, the shooting optical axis of the image shooting device is parallel to the optical axis of the near-to-eye display component to be measured, and the distance between the shooting optical axis of the image shooting device and the optical axis of the near-to-;
step S2: setting an image display of a near-eye display component to be tested to display preset image information;
step S3: setting an image shooting device to clearly image a main virtual image projected by a near-eye display assembly to be detected, and acquiring a main shooting image corresponding to the main virtual image; setting an image shooting device to clearly image an interference virtual image projected by a near-eye display assembly to be detected, and acquiring an interference shooting image corresponding to the interference virtual image;
step S4: the main control device respectively carries out image calculation processing on the main shot image and the interference shot image to obtain the brightness information of the main virtual image and the brightness information of the interference virtual image, and calculates the image interference degree according to the obtained brightness information;
step S41: if the image interference degree measurement under the condition of other optical axis deviation distance values and/or exit pupil distance values is required, returning to the step S1, otherwise, executing the step S5;
step S5: the master control device outputs the image interference degree.
In another possible embodiment, the position adjustment mechanism is an electrically controlled adjustment mechanism and is communicatively connected to the main control device, a position adjustment mechanism control program preset in the main control device allows a user to simultaneously input a plurality of optical axis deviation distance values to be measured and/or a plurality of exit pupil distance values to be measured, the main control device sequentially controls the position adjustment mechanism so that each set of optical axis deviation distance values to be measured and each set of exit pupil distance values to be measured are satisfied between the image capturing device and the near-eye display module to be measured, controls the image capturing device to perform image capturing and image interference calculation, and finally outputs and presents the image interference corresponding to the optical axis deviation distance values to be measured and/or the exit pupil distance values to be measured to the user.
The near-eye display measurement method provided by the invention can reliably and effectively measure the image interference degree of the display virtual image of the refraction-reflection type near-eye display module, and can provide judgment support for judging the quality of the display image of the refraction-reflection type near-eye display module.
In the description of the present invention, it should also be noted that the terms "disposed" and "connected" are to be construed broadly and, for example, may be fixedly connected, detachably connected, or integrally connected, unless expressly stated or limited otherwise. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The near-eye display measurement method is applied to a near-eye display measurement system, and the near-eye display measurement system comprises an image shooting device, a position measurement device, a position adjusting mechanism, an image shooting supporting mechanism, a near-eye display assembly to be measured, a module supporting mechanism to be measured and a main control device; the image shooting device is in communication connection with the main control device and is arranged on the image shooting supporting mechanism; the near-to-eye display assembly to be tested is arranged on the module supporting mechanism to be tested, and the method is characterized by comprising the following steps of:
step S1: the position measuring device measures the spatial position of the near-to-eye display component to be measured relative to the image shooting device, and adjusts the image shooting supporting mechanism and/or the module supporting mechanism to be measured, so that the distance between the optical entrance pupil of the image shooting device and the near-to-eye display component to be measured is the distance value of the exit pupil to be measured, the shooting optical axis of the image shooting device is parallel to the optical axis of the near-to-eye display component to be measured, and the distance between the shooting optical axis of the image shooting device and the optical axis of the near-to-;
step S2: setting an image display of a near-eye display component to be tested to display preset image information;
step S3: setting an image shooting device to clearly image a main virtual image projected by a near-eye display assembly to be detected, and acquiring a main shooting image corresponding to the main virtual image; setting an image shooting device to clearly image an interference virtual image projected by a near-eye display assembly to be detected, and acquiring an interference shooting image corresponding to the interference virtual image;
step S4: the main control device respectively carries out image calculation processing on the main shot image and the interference shot image to obtain the brightness information of the main virtual image and the brightness information of the interference virtual image, and calculates the image interference degree according to the obtained brightness information;
step S5: the master control device outputs the image interference degree.
2. The near-eye display measurement method according to claim 1, further comprising, after step S4:
step S41: if the measurement in the state of the other optical axis deviation distance values and/or the exit pupil distance value needs to be measured, it returns to step S1, otherwise, step S5 is performed.
3. Near-to-eye display measurement system, its characterized in that, including image shooting device, position measurement device, position adjustment mechanism, image shooting supporting mechanism, the near-to-eye display subassembly that awaits measuring, module supporting mechanism, the master control unit that awaits measuring, position measurement device is used for measuring the spatial position of the near-to-eye display subassembly that awaits measuring for image shooting device, image shooting device sets up on the image shooting supporting mechanism, the near-to-eye display subassembly that awaits measuring sets up on the module supporting mechanism that awaits measuring, the near-to-eye display subassembly that awaits measuring is the main virtual image and the interference virtual image that do not overlap each other to preset image information projection, preset image information is for the image information who includes preset image unit, image shooting device shoots the virtual image of near-to-eye display subassembly projection that awaits measuring and obtains main shooting image and interference shooting image, and the main control device processes and calculates the main shot image and the interference shot image to obtain the image interference degree of the near-to-eye display assembly to be detected.
4. The near-eye display measurement system of claim 3, wherein the preset image information is at least one set of image information comprising a preset image unit, the preset image unit in each set of image information comprises a pattern-free region and a pattern region, and the maximum equivalent dimension S1 of the inner boundary of the pattern region and the maximum equivalent dimension S2 of the outer boundary of the pattern region satisfy the relationship:
S1*β1＞K*(S2*β2)
wherein: beta 1 and beta 2 are respectively the image magnification in the main virtual image light path and the image magnification in the interference virtual image light path of the near-eye display module to be tested, and K is a coefficient larger than 1.
5. The near-eye display measurement system of claim 3, wherein the preset image information is at least one set of image information comprising a plurality of preset image units, the preset image units in each set of image information have no overlap with each other, and each preset image unit comprises a no-pattern region and a pattern region, and the maximum equivalent dimension S1 of the inner boundary of the pattern region and the maximum equivalent dimension S2 of the outer boundary of the pattern region satisfy the relationship:
wherein: beta 1, beta 2 and L91 are respectively the image magnification in the main virtual image light path of the near-eye display module to be tested, the image magnification in the interference virtual image light path, the center of the boundary of the preset image unit to the central point of the display area of the image display in the near-eye display module to be tested.
6. The near-eye display measurement system of any one of claims 3-5 wherein the pattern areas in the preset image cells are solid colors.
7. The near-eye display measurement system of any one of claims 3-5, wherein the preset image information is provided on a near-eye display assembly under test.
8. The near-eye display measurement system of any one of claims 3-5, wherein the preset image information is provided on a master device.
9. The near-eye display measurement system of any one of claims 3-5, wherein the image capture device is a zoom camera.
10. The near-eye display measurement system of any one of claims 3 to 5, wherein the image capturing device is a fixed-focus image capturing device, the minimum capturing distance of the fixed-focus image capturing device is not greater than 30mm, and the maximum capturing distance is not less than 1 m.
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