CN111751082B - Method and device for detecting assembly precision - Google Patents
Method and device for detecting assembly precision Download PDFInfo
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- CN111751082B CN111751082B CN202010595213.9A CN202010595213A CN111751082B CN 111751082 B CN111751082 B CN 111751082B CN 202010595213 A CN202010595213 A CN 202010595213A CN 111751082 B CN111751082 B CN 111751082B
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Abstract
The invention discloses a detection method and a detection device for assembly precision, wherein the detection method for the assembly precision comprises the following steps: the detection method is applied to a head-mounted display device, the head-mounted display device comprises a waveguide sheet, and the detection method comprises the following steps: correcting the position distance between a first graph displayed by the waveguide sheet and a first standard graph of a standard imaging surface to be within a preset first range value; comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value or not; the first graph corresponds to the first standard graph, and the second graph corresponds to the second standard graph. The technical scheme of the invention can effectively measure the assembly precision of the product, thereby ensuring the image quality of projection display.
Description
Technical Field
The invention relates to the technical field of precision detection, in particular to a detection method and a detection device for assembly precision.
Background
AR (Augmented Reality) display technology has gradually developed to various fields in people's lives because it can provide users with an immersive experience. Corresponding higher demands are also placed on AR display devices. However, the existing AR display device lacks the measurement of the assembly precision of the manufactured product in the production and manufacturing process, and the assembly precision is uneven, so that the quality of the image projected and displayed by the AR display device is finally poor.
The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.
Disclosure of Invention
Therefore, the method and the device for detecting the assembly precision aim to effectively measure the assembly precision of the product so as to ensure the image quality of projection display, and solve the problems that the assembly precision of the manufactured product is not measured in the production and manufacturing process, and the assembly precision is uneven, so that the image quality of the projection display is poor.
In order to achieve the above object, the present invention provides a method for detecting assembly accuracy, the method being applied to a head-mounted display device, the head-mounted display device including a waveguide sheet, the method comprising:
correcting the position distance between a first graph displayed by the waveguide sheet and a first standard graph of a standard imaging surface to be within a preset first range value;
comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value or not; the first graph corresponds to the first standard graph, and the second graph corresponds to the second standard graph.
Optionally, the standard imaging plane is further provided with a third standard pattern, and the third standard pattern is symmetrically arranged with the second standard pattern by taking the first standard pattern as a center;
the detection method further comprises the following steps:
and comparing whether the position distance between a third graph displayed by the waveguide piece and a third standard graph of the standard imaging surface is within a preset second range value or not, wherein the third graph corresponds to the third standard graph.
Optionally, the standard imaging plane further provides a fourth standard pattern and a fifth standard pattern, the fourth standard pattern and the fifth standard pattern are symmetrically arranged with the first standard pattern as a center, a center-of-gravity connecting line of the second standard pattern and the third standard pattern is horizontally connected, a center-of-gravity connecting line of the fourth standard pattern and the fifth standard pattern is vertically connected, the fourth pattern displayed by the waveguide sheet corresponds to the fourth standard pattern, and the fifth pattern displayed by the waveguide sheet corresponds to the fifth standard pattern;
the detection method further comprises the following steps:
comparing whether the position distance between a fourth graph displayed by the waveguide sheet and a fourth standard graph of the standard imaging surface is within a preset second range value or not;
and comparing whether the position distance between the fifth graph displayed by the waveguide sheet and the fifth standard graph of the standard imaging surface is within a preset second range value.
Optionally, the step of correcting the position distance between the first graph displayed on the waveguide sheet and the first standard graph on the standard imaging plane to be within a preset first range value includes:
acquiring a first mark coordinate of a first graph of a waveguide piece display area;
the method comprises the steps of obtaining a first standard coordinate of a first standard graph of a standard imaging surface, adjusting the position of the first graph, and adjusting the distance between the first mark coordinate and the first standard coordinate to be within a preset first range value.
Optionally, the step of obtaining the first mark coordinate of the first graph of the waveguide piece display area includes:
acquiring a display image of a waveguide sheet display area, and carrying out binarization processing on the display image to obtain a first graph;
and calculating the gravity center position of the first graph as the first mark coordinate.
Optionally, the head-mounted display device further comprises a projection unit;
the step of obtaining the display image of the display area of the waveguide sheet further includes:
controlling the projection unit to transmit projection light to the waveguide sheet, wherein the projection light forms a display image in a display area of the waveguide sheet;
and controlling a camera to shoot to obtain the display image.
Optionally, the standard imaging plane includes a surface of a film, the surface of the film is provided with a standard pattern, the standard pattern includes the first standard pattern, and a center of gravity of the first standard pattern coincides with the optical axis of the camera.
Optionally, a distance-increasing lens is arranged between the waveguide sheet and the film sheet;
the step of controlling the camera to shoot to obtain the display image comprises the following steps:
and controlling a camera to shoot a display image imaged by the distance-increasing lens.
Further, in order to achieve the above object, the present invention also provides a detection apparatus of assembly accuracy, which is applied to a head-mounted display device including a waveguide sheet, the detection apparatus of assembly accuracy including: a control terminal, the control terminal comprising: the device comprises a correction module and a judgment module;
the correction module is used for correcting the position distance between the first graph displayed by the waveguide sheet and the first standard graph of the standard imaging surface to be within a preset first range value; wherein the first graph corresponds to the first standard graph;
the judging module is used for comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value or not; wherein the second graphic corresponds to the second standard graphic.
Optionally, the device for detecting assembly accuracy further includes:
the camera is used for shooting and displaying images and is connected with the control terminal;
the film is arranged at one end, far away from the camera, of the waveguide sheet; and
and the distance-increasing lens is arranged between the waveguide sheet and the film sheet.
According to the technical scheme, the head-mounted display device is provided with the waveguide sheet, the projection light is transmitted in the waveguide sheet, the image is projected and displayed on the waveguide sheet, and the displayed image comprises the first graph. The first standard pattern is provided on the standard image forming surface, and normally, the first pattern and the first standard pattern are overlapped in position, but the first range value is set because of the assembly accuracy. And adjusting the position distance between the first graph and the first standard graph to be within a preset first range value. And finishing the primary correction of the waveguide sheet. In addition, the display image further comprises a second graph, the standard imaging plane is further provided with a second standard graph, through comparing the position distance between the second graph and the second standard graph, whether the position distance between the second graph and the second standard graph is within a preset second range value is judged, if the position distance is within the second range value, the assembly of the head-mounted display device is qualified, and if the position distance is not within the second range value, the assembly of the head-mounted display device is unqualified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of a method for detecting assembly accuracy according to the present invention;
FIG. 2 is a flowchart illustrating a second embodiment of the method for detecting assembly accuracy according to the present invention;
FIG. 3 is a flow chart illustrating a third embodiment of the method for detecting assembly accuracy according to the present invention;
FIG. 4 is a flowchart illustrating a method for detecting assembly accuracy according to a fourth embodiment of the present invention;
FIG. 5 is a flow chart illustrating a fifth embodiment of the method for detecting assembly accuracy of the present invention;
FIG. 6 is a flowchart illustrating a method for detecting assembly accuracy according to a sixth embodiment of the present invention;
FIG. 7 is a flowchart illustrating an eighth embodiment of the method for detecting assembly accuracy according to the present invention;
FIG. 8 is a schematic structural diagram of a control terminal of the detection apparatus for assembly accuracy according to the present invention;
FIG. 9 is a schematic structural view of the assembly precision detecting device of the present invention;
fig. 10 is a schematic view of the surface of a film in the inspection device of the assembly accuracy of the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention provides a method for detecting assembly accuracy, where the method is applied to a head-mounted display device, where the head-mounted display device includes a waveguide sheet, and a position where the waveguide sheet is assembled is away from an ideal position due to manual or process parameter influences during an assembly process of the waveguide sheet in the head-mounted display device, and the final imaging quality is affected due to an excessive error. The detection method comprises the following steps:
step S10, correcting the position distance between the first graph displayed by the waveguide sheet and the first standard graph of the standard imaging surface to be within a preset first range value; specifically, the waveguide sheet may also be referred to as a waveguide medium, light is transmitted in the waveguide sheet by total reflection, the light is incident at one end and emitted at the other end, and the emergent direction of the light can be flexibly adjusted by the waveguide sheet. The waveguide sheet is a transparent material, and after light exited through the other end, the user can see through the waveguide sheet and observe the display image, and the region that can observe the display image is the display area. The projection unit transmits projection light to the waveguide sheet, the display image position formed by the projection light through the emergent end of the waveguide sheet can be provided with a standard imaging surface, and a first standard graph is arranged on the standard imaging surface. The display image has a first graphic, and the first graphic and the first standard graphic have the same shape, for example, the first graphic and the first standard graphic are cross-shaped. Theoretically, the first pattern and the first standard pattern can be superposed, but a first range value is set due to the existence of assembly error, and the distance between the first pattern and the first standard pattern is corrected within the first range value. If not, the head mounted display device or the waveguide sheet is adjusted so that the distance between the first graphic and the first standard graphic is within the first range of values.
Further, since the degree of overlap between the first pattern and the first standard pattern is determined in accordance with the distance, the first pattern and the first standard pattern may have different shapes and may be determined by calculating the distance of the center of gravity between them. For example, the first pattern is a cross shape, and the first standard pattern is a pentagon shape.
Step S20, comparing whether the position distance between the second graph displayed by the waveguide sheet and the second standard graph of the standard imaging surface is in the preset second range value; the first graph corresponds to the first standard graph, and the second graph corresponds to the second standard graph.
Specifically, in the theoretical case, when there is no error in assembly, the positions of the first pattern and the first standard pattern coincide, and the positions of the second pattern and the second standard pattern also coincide. But the error can only be reduced and cannot be eliminated. After the position of the waveguide sheet is corrected, the assembly accuracy of the waveguide sheet is detected. And setting a second range value, comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value, if so, determining that the waveguide sheet is qualified in assembly, and if not, determining that the waveguide sheet is unqualified in assembly. Generally speaking, the accuracy requirements when calibrating the waveguide sheet are higher, so the first range of values is generally smaller than the second range of values.
In the technical scheme provided by the implementation, a waveguide sheet is arranged in the head-mounted display device, the projection light is transmitted in the waveguide sheet, and an image is projected and displayed on the waveguide sheet, wherein the displayed image comprises a first graph. The first standard pattern is provided on the standard image forming surface, and normally, the first pattern and the first standard pattern are overlapped in position, but the first range value is set because of the assembly accuracy. And adjusting the position distance between the first graph and the first standard graph to be within a preset first range value. And finishing the preliminary correction of the waveguide sheet. In addition, the display image further comprises a second graph, the standard imaging surface is further provided with a second standard graph, whether the position distance between the second graph and the second standard graph is within a preset second range value is judged by comparing the position distance between the second graph and the second standard graph, if the position distance is within the second range value, the assembly of the head-mounted display device is qualified, and if the position distance is not within the second range value, the assembly of the head-mounted display device is unqualified.
Referring to fig. 2, a second embodiment of the present invention is proposed on the basis of the first embodiment proposed by the present invention. The standard imaging surface is also provided with a third standard graph, and the third standard graph is symmetrically arranged with the second standard graph by taking the first standard graph as the center;
the detection method further comprises the following steps:
step S30, comparing whether the position distance between the third pattern displayed on the waveguide sheet and the third standard pattern of the standard imaging plane is within a preset second range value, wherein the third pattern and the third standard pattern correspond to each other.
Head mounted display devices are used on the head of a user, such as AR display devices. The image inside the AR display device is observed through both eyes of the user. The positions of the two eyes of the user are pupil distances, and the distances between the two eyes of different people are different, namely the pupil distances are different. Of course, if the viewing field accuracy seen by the left and right eyes is different, the image effect seen by the user will be poor, for example, the viewing field range seen by the left eye is different from that seen by the right eye, and the picture distance seen by the left eye is different from that seen by the right eye, so that it is difficult for the user to form a stereoscopic viewing experience. For this purpose, it is necessary to detect whether the field accuracy is satisfactory. The assembly accuracy of the waveguide sheet also directly affects the field accuracy.
Specifically, the standard imaging plane is further provided with a third standard graph, and the third standard graph is symmetrically arranged with the second standard graph by taking the first standard graph as a center, so that the second standard graph and the third standard graph can be understood as measurement of the accuracy of the field of view in the horizontal direction, namely, the left direction and the right direction of the user visual angle. And judging whether the visual field precision of the left eye and the visual field precision of the right eye meet the requirements or not by judging whether the position distance between the third graph and the third standard graph is within a preset second range value or not. In addition, in order to satisfy the imaging effect, the position distance between the second pattern and the second standard pattern is within a preset second range value, and the position distance between the third pattern and the third standard pattern is also within a preset second range value. And then, left and right image errors seen by two eyes are guaranteed, and the left and right image errors cannot be recognized by human eyes, so that the watching experience of a user is prevented from being influenced.
Referring to fig. 3, a third embodiment of the present invention is proposed on the basis of the second embodiment proposed by the present invention. The standard imaging surface is also provided with a fourth standard graph and a fifth standard graph, the fourth standard graph and the fifth standard graph are symmetrically arranged by taking the first standard graph as a center, a gravity center connecting line of the second standard graph and the third standard graph is horizontally connected, a gravity center connecting line of the fourth standard graph and the fifth standard graph is vertically connected, the fourth graph displayed by the waveguide sheet corresponds to the fourth standard graph, and the fifth graph displayed by the waveguide sheet corresponds to the fifth standard graph;
the detection method further comprises the following steps:
step S40, comparing whether the position distance between the fourth graph displayed by the waveguide sheet and the fourth standard graph of the standard imaging surface is in a preset second range value;
step S50, comparing whether the position distance between the fifth pattern displayed on the waveguide sheet and the fifth standard pattern on the standard imaging plane is within a preset second range value.
Specifically, the user views the image also from the top and bottom, and therefore the top and bottom field accuracy is also required to be within a predetermined range. The gravity center connecting line of the second standard graph and the third standard graph is horizontally connected, the gravity center connecting line of the fourth standard graph and the fifth standard graph is vertically connected, and the gravity center connecting line of the second standard graph and the third standard graph is perpendicular to the gravity center connecting line of the fourth standard graph and the fifth standard graph. It can be understood that the second standard graph and the third standard graph judge the left and right visual field precision, and the fourth standard graph and the fifth standard graph judge the upper and lower visual field precision. In addition, the first pattern, the second pattern, the third pattern, the fourth pattern, and the fifth pattern may have different pattern shapes, but generally, the first pattern is the same as the first standard pattern, the second pattern is the same as the second standard pattern, the third pattern is the same as the third standard pattern, the fourth pattern is the same as the fourth standard pattern, and the fifth pattern is the same as the fifth standard pattern, so that it is convenient to calculate the degree of coincidence between the corresponding patterns, i.e., the value of the distance between each other. Through the third embodiment of the application, the left and right image errors seen by the two eyes can be guaranteed to be within the allowable range, and meanwhile, the upper and lower image errors seen by the two eyes can also be guaranteed to be within the allowable range, so that the user can be guaranteed to obtain better viewing experience.
Referring to fig. 4, a fourth embodiment of the present invention is proposed on the basis of the first embodiment proposed by the present invention. The method comprises the following steps of correcting the position distance between a first graph displayed by a waveguide sheet and a first standard graph of a standard imaging surface to be within a preset first range value, wherein the step comprises the following steps:
step S110, acquiring a first mark coordinate of a first graph of a waveguide piece display area;
step S120, obtaining a first standard coordinate of a first standard graph of the standard imaging plane, adjusting a position of the first graph, and adjusting a distance between the first mark coordinate and the first standard coordinate to a preset first range value.
Therefore, the coordinate is a point value, the distance between the coordinate position of the first graph and the coordinate position of the first standard graph can be accurately calculated by determining the coordinate position of the first graph and the coordinate position of the first standard graph, meanwhile, the influence of the shape of the graph can be omitted, the result can be judged more easily and quickly by directly determining the distance between the two points, and the waveguide sheet can be corrected conveniently.
Referring to fig. 5, a fifth embodiment of the present invention is proposed on the basis of the fourth embodiment proposed by the present invention. The step of obtaining first marker coordinates of a first pattern of a waveguide sheet display area includes:
step S111, obtaining a display image of a waveguide sheet display area, and carrying out binarization processing on the display image to obtain a first graph;
in step S112, the barycentric position of the first graphic is calculated as the first marker coordinates.
Specifically, a display image of the display area of the waveguide sheet is obtained by shooting, and the display image includes a first pattern, and the first pattern is generally darker in color, such as a black cross. Through the binarization processing of the displayed image, the binarization processing is to set a threshold value, the brightness of the displayed image is processed, pixel points below the threshold value are all converted into black, and pixel points above the threshold value are all converted into white. Because the display image comprises the black cross-shaped first graph, a clear first graph boundary is obtained after binarization processing. And calculating to obtain the gravity center position of the first graph, such as the difference value of the vertical coordinates at the two longitudinal ends of the first graph or the difference value of the horizontal coordinates at the two transverse ends of the first graph, or combining the two modes to obtain the gravity center position of the first graph, namely the first mark coordinate.
Similarly, the first standard coordinates of the first standard figure may be calculated by referring to steps S111 and S112. In addition, the second figure has second mark coordinates, the second standard figure has second standard coordinates, and the determination of the second mark coordinates and the second standard coordinates also refers to step S111 and step S112. The third pattern has third mark coordinates, the third standard pattern has third standard coordinates, the fourth pattern has fourth mark coordinates, the fifth standard pattern has fifth standard coordinates, determination of the third mark coordinates and the third standard coordinates, determination of the fourth mark coordinates and the fourth standard coordinates, and determination of the fifth mark coordinates and the fifth standard coordinates refer also to steps S111 and S112.
Referring to fig. 6, a sixth embodiment of the present invention is proposed on the basis of the fifth embodiment proposed by the present invention. The head-mounted display device further comprises a projection unit;
the step of obtaining a display image of the display area of the waveguide sheet further comprises:
step S101, controlling a projection unit to transmit projection light to a waveguide sheet, wherein the projection light forms a display image in a display area of the waveguide sheet; the projection light is transmitted in the waveguide piece in a total reflection mode, the projection light is injected into one end and is emitted out from the other end, after the projection light is emitted out from the other end, a user can observe a display image through the waveguide piece, and an area capable of observing the display image is a display area. The image observed through the waveguide sheet is a virtual image.
And step S102, controlling the camera to shoot to obtain a display image. By controlling the camera to shoot through the waveguide sheet, the obtained virtual image is the display image.
Among them, the camera is industrial camera and is also commonly called as a video camera, and compared with the traditional civil camera, the industrial camera has high image stability, high transmission capability, high anti-interference capability and the like, so that a display image with higher quality can be obtained through the industrial camera.
Further, a seventh embodiment of the present invention is proposed on the basis of the sixth embodiment proposed by the present invention. The standard imaging plane comprises the surface of a film, the surface of the film is provided with a standard graph, the standard graph comprises a first standard graph, and the gravity center of the first standard graph is coincided with the optical axis of the camera. Thus, the center position of the image shot and displayed by the camera can be determined to be the center of gravity of the first standard graph. When the waveguide film is detected, the distance between the camera and the film is fixed, and after the camera finishes shooting the first graph and the first standard graph, the camera is moved in a plane with the fixed distance between the camera and the film to shoot.
Referring to fig. 7, an eighth embodiment of the present invention is proposed on the basis of the seventh embodiment proposed by the present invention. A distance-increasing lens is arranged between the waveguide film and the film;
the step of controlling the camera to shoot to obtain the display image comprises the following steps:
and step S103, controlling the camera to shoot the display image imaged by the distance-increasing lens. The intensifying lens may be a convex lens, and the distance-increasing lens shortens the position where the display image is focused. When a camera is used for simulating human eyes, the position for shooting the display image is generally far, for example, the display image focusing position is 4 meters far away from the waveguide sheet, so that a space of 4 meters far needs to be provided during detection, and a larger detection field is needed. In order to make up for the lack of the field or save the space of the field, the image is simulated at the position of 4 meters through the distance-increasing lens, and the position of the display image shot by the actual camera through the waveguide sheet is formed by converging through the distance-increasing lens, so that the imaging distance is shortened, and the space is saved.
It should be noted that the captured display image may include the standard pattern on the film sheet at the same time, and the coincidence degree between the pattern on the waveguide sheet and the standard pattern on the film sheet is analyzed and compared in the same display image, so as to detect the assembly accuracy of the waveguide sheet. Or shooting two display images through a camera, wherein one display image comprises a graph on a waveguide film, and the other display image comprises a standard graph on a film, and then carrying out comparative analysis on the two display images.
Referring to fig. 8 to 10, the present invention further provides an assembly accuracy detecting apparatus, which is applied to a head-mounted display device, wherein the head-mounted display device includes a waveguide sheet 50, and the assembly accuracy detecting apparatus includes: a control terminal 10, the control terminal 10 comprising: a correction module 110 and a decision 120 module;
the correcting module 110 is configured to correct a position distance between the first pattern displayed on the waveguide sheet 50 and the first standard pattern on the standard imaging plane to a preset first range value; wherein the first graph corresponds to the first standard graph; specifically, the waveguide sheet 50 may also be referred to as a waveguide medium, light is transmitted by total reflection in the waveguide sheet 50, the light enters at one end and exits at the other end, and the exit direction of the light can be flexibly adjusted by the waveguide sheet 50. The waveguide sheet 50 is made of a transparent material, and after the light exits through the other end, the user can observe the display image through the waveguide sheet 50, and the region where the display image can be observed is the display region. The projection unit 60 emits projection light to the waveguide sheet, and a standard imaging surface can be set at a display image position formed by the projection light passing through the exit end of the waveguide sheet 50, and a first standard graph is set on the standard imaging surface. The display image has a first graphic, and the first graphic and the first standard graphic have the same shape, for example, the first graphic and the first standard graphic are cross-shaped. Theoretically, the first pattern and the first standard pattern can be superposed, but a first range value is set due to the existence of assembly error, and the distance between the first pattern and the first standard pattern is corrected within the first range value. If not, the head mounted display device or the waveguide sheet 50 is adjusted so that the distance between the first graphic and the first standard graphic is within the first range of values. Further, since the degree of overlap between the first pattern and the first standard pattern is determined in accordance with the distance, the first pattern and the first standard pattern may have different shapes and may be determined by calculating the distance of the center of gravity between them. For example, the first pattern is a cross shape, and the first standard pattern is a pentagon shape.
A judging module 120, configured to compare whether a position distance between the second pattern displayed on the waveguide sheet 50 and the second standard pattern on the standard imaging plane is within a preset second range value; wherein the second pattern corresponds to the second standard pattern. Specifically, in the theoretical case, when there is no error in assembly, the positions of the first pattern and the first standard pattern coincide, and the positions of the second pattern and the second standard pattern also coincide. But the error can only be reduced and cannot be eliminated. After the position of the waveguide sheet 50 is corrected, the assembly accuracy of the waveguide sheet 50 is detected. And setting a second range value, comparing whether the position distance between the second graph displayed by the waveguide sheet 50 and the second standard graph of the standard imaging surface is within a preset second range value, if so, determining that the waveguide sheet 50 is qualified in assembly, and if not, determining that the waveguide sheet 50 is unqualified in assembly. Generally speaking, the accuracy in correcting the waveguide sheet 50 is more demanding, and therefore the first range of values is generally smaller than the second range of values.
In the technical scheme provided by this implementation, a waveguide sheet 50 is disposed in the head-mounted display device, the projection light is transmitted in the waveguide sheet 50, and an image is projected and displayed on the waveguide sheet 50, where the displayed image includes a first graphic. The first standard pattern is provided on the standard image forming surface, and normally, the first pattern and the first standard pattern are overlapped in position, but the first range value is set because of the assembly accuracy. And adjusting the position distance between the first graph and the first standard graph to be within a preset first range value. The preliminary correction of the waveguide sheet 50 is completed. In addition, the display image further comprises a second graph, the standard imaging surface is further provided with a second standard graph, whether the position distance between the second graph and the second standard graph is within a preset second range value is judged by comparing the position distance between the second graph and the second standard graph, if the position distance is within the second range value, the assembly of the head-mounted display device is qualified, and if the position distance is not within the second range value, the assembly of the head-mounted display device is unqualified.
Further, the detection device of the assembly accuracy further includes: a camera 20, a film 30 and a range lens 40.
The camera 20 is used for shooting display images, and the camera 20 is connected with the control terminal 10; the control terminal 10 is used to control the camera 20 to capture a display image. Among them, the camera is industrial camera and is also commonly called as a video camera, and compared with the traditional civil camera, the industrial camera has high image stability, high transmission capability, high anti-interference capability and the like, so that a display image with higher quality can be obtained through the industrial camera.
The film 30 is arranged at one end of the waveguide sheet 50 far away from the camera; five points are arranged on the surface of the film 30, and the five points can be understood as the gravity center points of the standard graph and can also be understood as the shape of the standard graph, namely a circle. Namely, the first standard graphic 310, the second standard graphic 320, the third standard graphic 330, the fourth standard graphic 340 and the fifth standard graphic 350. It can be seen that the first standard pattern 310 is disposed at the center of the film 30, and the first standard pattern 310 coincides with the optical axis 210 of the camera 20. On the basis of this, the assembly accuracy of the waveguide sheet 50 is checked.
The distance-increasing lens 40 is arranged between the waveguide sheet 50 and the film sheet, the enhancing lens can be a convex lens, and the distance-increasing lens 40 shortens the position of the display image for focusing. When the camera is used to simulate the human eye, the position of the display image is usually far, for example, the display image focusing position is 4 meters away from the waveguide sheet 50, so that a space of 4 meters away is required during the detection, and a larger detection field is required. In order to make up for the shortage of the field or to save the field space, the image is simulated at the position of 4 meters by the distance-increasing lens 40, and the position of the display image photographed by the actual camera 20 through the waveguide sheet 50 is formed by converging through the distance-increasing lens 40, so that the imaging distance is shortened and the space is saved.
The specific implementation manner of the communication process between the headset and the charging box of the headset communication system in this embodiment may refer to each embodiment of the detection method for assembly accuracy, and is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. 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 system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A detection method of assembly accuracy, applied to a head-mounted display device including a waveguide sheet and a projection unit, comprising:
correcting the position distance between a first graph displayed by a waveguide sheet and a first standard graph of a standard imaging surface to be within a preset first range value, wherein a projection unit emits projection light to the waveguide sheet, the projection light forms a display image through an emergent end of the waveguide sheet, the display image comprises the first graph and a second graph, the standard imaging surface comprises the surface of a film, the surface of the film is provided with the standard graph, and the standard graph comprises the first standard graph and the second standard graph;
comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value or not; the first graph corresponds to the first standard graph, and the second graph corresponds to the second standard graph.
2. The method for detecting the assembly accuracy according to claim 1, wherein a third standard pattern is further provided on the standard imaging plane, and the third standard pattern is symmetrically provided with respect to the second standard pattern with the first standard pattern as a center;
the detection method further comprises the following steps:
and comparing whether the position distance between a third graph displayed by the waveguide piece and a third standard graph of the standard imaging surface is within a preset second range value or not, wherein the third graph corresponds to the third standard graph.
3. The method for detecting the assembly accuracy according to claim 2, wherein a fourth standard pattern and a fifth standard pattern are further provided on the standard image formation plane, the fourth standard pattern and the fifth standard pattern are symmetrically arranged with respect to the first standard pattern as a center, a center-of-gravity connecting line between the second standard pattern and the third standard pattern is horizontally connected, a center-of-gravity connecting line between the fourth standard pattern and the fifth standard pattern is vertically connected, a fourth pattern displayed on the waveguide sheet corresponds to the fourth standard pattern, and a fifth pattern displayed on the waveguide sheet corresponds to the fifth standard pattern;
the detection method further comprises the following steps:
comparing whether the position distance between a fourth graph displayed by the waveguide sheet and a fourth standard graph of the standard imaging surface is within a preset second range value or not;
and comparing whether the position distance between the fifth graph displayed by the waveguide sheet and the fifth standard graph of the standard imaging surface is within a preset second range value.
4. The method for detecting the assembly accuracy according to any one of claims 1 to 3, wherein the step of correcting the positional distance between the first pattern displayed on the waveguide sheet and the first standard pattern on the standard imaging plane to within a preset first range value includes:
acquiring a first mark coordinate of a first graph of a waveguide piece display area;
the method comprises the steps of obtaining a first standard coordinate of a first standard graph of a standard imaging surface, adjusting the position of the first graph, and adjusting the distance between the first mark coordinate and the first standard coordinate to be within a preset first range value.
5. The method for detecting the assembly accuracy as set forth in claim 4, wherein the step of obtaining the first mark coordinates of the first pattern of the waveguide sheet display area includes:
acquiring a display image of a waveguide sheet display area, and carrying out binarization processing on the display image to obtain a first graph;
and calculating the gravity center position of the first graph as the first mark coordinate.
6. The method for detecting the assembly accuracy as set forth in claim 5, wherein the step of obtaining the display image of the display area of the waveguide sheet further includes:
controlling the projection unit to transmit projection light to the waveguide sheet, wherein the projection light forms a display image in a display area of the waveguide sheet;
and controlling a camera to shoot to obtain the display image.
7. The method for detecting the assembly accuracy as set forth in claim 6, wherein a center of gravity of the first standard pattern coincides with the optical axis of the camera.
8. The method for detecting the assembly accuracy according to claim 7, wherein a distance-increasing lens is provided between the waveguide sheet and the film sheet;
the step of controlling the camera to shoot to obtain the display image comprises the following steps:
and controlling a camera to shoot a display image imaged by the distance-increasing lens.
9. The utility model provides a detection device of equipment precision, its characterized in that, detection device is applied to head-mounted display equipment, head-mounted display equipment includes waveguide piece and projection unit, detection device of equipment precision includes: a control terminal, the control terminal comprising: the device comprises a correction module and a judgment module;
the correction module is used for correcting the position distance between the first graph displayed by the waveguide sheet and the first standard graph of the standard imaging surface to be within a preset first range value; the projection unit emits projection light to the waveguide sheet, the projection light forms a display image through the emergent end of the waveguide sheet, the display image comprises a first graph and a second graph, the standard imaging surface comprises the surface of the film, the surface of the film is provided with a standard graph, and the standard graph comprises the first standard graph and the second standard graph; the first graph corresponds to the first standard graph;
the judging module is used for comparing whether the position distance between a second graph displayed by the waveguide sheet and a second standard graph of the standard imaging surface is within a preset second range value or not; wherein the second graphic corresponds to the second standard graphic.
10. The assembly accuracy detecting device according to claim 9, further comprising:
the camera is used for shooting and displaying images and is connected with the control terminal;
the film is arranged at one end, far away from the camera, of the waveguide sheet; and
and the distance-increasing lens is arranged between the waveguide sheet and the film sheet.
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