Method and device for detecting offset angle of display screen

Abstract

The invention provides a display screen offset angle detection method and device, and relates to the technical field of data display. A detection camera, a lens and a display screen are sequentially arranged at intervals, a display interface of the display screen comprises a first target point location and a second target point location, and the second target point location is located on the optical axis of the detection camera. In this way, the detection camera can determine the first virtual image distance of the first target point location and the second virtual image distance of the second target point location; according to the focal length corresponding to the second virtual image distance, shooting a display interface of the display screen shot through the lens to obtain a first shot picture; further, according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance and the distance between the first target point location and the second target point location in the first shot picture, the offset angle of the display screen is determined. Therefore, compensation can be performed on the display interface displayed by the display screen based on the deviation angle, and the problem of poor display effect is avoided.

Description

Technical Field

[0001] The present application relates to data display technology, and in particular to a method and device for detecting an angle of deviation of a display screen. Background Art

[0002] As the concept of the metaverse continues to gain popularity, VR glasses, AR glasses, MR glasses, etc. are hailed as the "door keys" to the metaverse due to their interactivity. Usually, VR glasses, AR glasses, and MR glasses include display screens and lenses. Due to reasons such as assembly process, the optical axis of the display screen of VR glasses, AR glasses, and MR glasses is not in a straight line with the optical axis of the lens, resulting in an angular deviation between the optical axis of the display screen and the optical axis of the lens, resulting in poor display effects of VR glasses, AR glasses, and MR glasses. Summary of the invention

[0003] The present application provides a method and device for detecting the angle offset of a display screen, which are used to solve the problem in the prior art that the optical axis of the display screen and the optical axis of the lens of VR glasses, AR glasses, MR glasses, etc. are not in a straight line, resulting in an angular deviation between the optical axis of the display screen and the optical axis of the lens, resulting in poor display effects of the VR glasses, AR glasses, and MR glasses.

[0004] In a first aspect, the present application provides a method for detecting an angle of a display screen offset, which is applied to an angle detection system for a display screen offset, wherein the system includes a lens and a display screen, wherein a detection camera, the lens, and the display screen are sequentially arranged at intervals, and a display interface of the display screen includes a first target point and a second target point, wherein the second target point is on the optical axis of the detection camera, and includes:

[0005] The detection camera determines a first virtual image distance of a first target point and a second virtual image distance of a second target point;

[0006] The detection camera photographs the display interface of the display screen through the lens according to the focal length corresponding to the second virtual image distance to obtain a first photograph;

[0007] The detection camera determines the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo.

[0008] In a second aspect, the present application further provides a display screen offset angle detection device, which is configured on a detection camera, and the detection camera is applied to a display screen offset angle detection system, and the display screen offset angle detection system also includes a lens and a display screen, and the detection camera, the lens and the display screen are sequentially arranged at intervals, and the display interface of the display screen includes a first target point and a second target point, wherein the second target point is on the optical axis of the detection camera, and the device includes:

[0009] A virtual image distance determining unit, used to determine a first virtual image distance of a first target point and a second virtual image distance of a second target point;

[0010] A photo shooting unit, used for shooting a display interface of the display screen through the lens according to the focal length corresponding to the second virtual image distance, to obtain a first shot photo;

[0011] The offset angle determination unit is used to determine the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo.

[0012] The present application provides a method and device for detecting the angle of the offset of a display screen. Since a detection camera, a lens, and a display screen are arranged in sequence and at intervals, the display interface of the display screen includes a first target point and a second target point, wherein the second target point is on the optical axis of the detection camera. In this way, the detection camera can determine the first virtual image distance of the first target point and the second virtual image distance of the second target point; and according to the focal length corresponding to the second virtual image distance, the display interface of the display screen is photographed through the lens to obtain a first photographed photo; and then, according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first photographed photo, the offset angle of the display screen is determined. In this way, the display interface displayed on the display screen can be compensated based on the offset angle, avoiding the problem of poor display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0014] Figure 1 A block diagram of the structure of the angle detection system for the offset of the display screen provided in the embodiment of the present application;

[0015] Figure 2 A flow chart of a method for detecting an angle of deviation of a display screen provided in an embodiment of the present application;

[0016] Figure 3 A schematic diagram of a display interface of a display screen provided in an embodiment of the present application;

[0017] Figure 4 for Figure 2 Schematic diagram of specific steps of S101;

[0018] Figure 5A schematic diagram of the structure of the detection camera, test chart and slide rail provided in the embodiment of the present application;

[0019] Figure 6 This is a functional module block diagram of a device for detecting the angle of deviation of a display screen provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0021] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0022] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element or an intervening layer / element may exist therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed.

[0023] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0024] The embodiment of the present application provides a method for detecting the angle of the offset of a display screen, which is applied to the angle detection system for the offset of a display screen. Before the detection, the staff can sequentially arrange the detection camera 101, the lens 102 and the display screen 103 at intervals to form the above-mentioned angle detection system for the offset of the display screen, and turn on and light up the display screen 103 so that the display screen 103 starts to display the display interface.

[0025] like Figure 1 As shown, the angle detection system of the display screen offset includes a detection camera 101, a lens 102 and a display screen 103, and the detection camera 101, the lens 102 and the display screen 103 are arranged in sequence. Figure 2As shown, the display interface of the display screen 103 includes a first target point 201 and a second target point 202. Figure 1 As shown, the second target point 202 is on the optical axis of the detection camera 101. Specifically, Figure 3 As shown, the method provided in the embodiment of the present application includes:

[0026] S301 : The detection camera 101 determines a first virtual image distance of the first target point 201 and a second virtual image distance of the second target point 202 .

[0027] Specifically, Figure 4 As shown, S301 can be specifically implemented as follows:

[0028] S401: The detection camera 101 photographs the display interface of the display screen 103 based on a plurality of different focal lengths to obtain a plurality of second photographs.

[0029] Exemplarily, the staff may trigger a button on the detection camera 101 to enable the detection camera 101 to capture the display interface of the display screen 103 based on a plurality of different focal lengths to obtain a plurality of second captured photos.

[0030] For example, the detection camera 101 takes a second photo 1 based on a focal length of 1, takes a second photo 2 based on a focal length of 2, takes a second photo 3 based on a focal length of 3, ..., takes a second photo N based on a focal length of N; the detection camera 101 is a zoom camera.

[0031] S402: The detection camera 101 determines, among the plurality of second photographs, a first focal length corresponding to the second photograph in which the first target point 201 is clearest and a second focal length corresponding to the second photograph in which the second target point 202 is clearest.

[0032] Based on the above S401 , assuming that the first target point 201 in the second photograph 1 is the clearest, the first focal length is focal length 1 , and the first target point 201 in the second photograph 2 is the clearest, the second focal length is focal length 2 .

[0033] S403: The detection camera 101 determines, according to a preset mapping relationship, a first virtual image distance of the first target point 201 corresponding to the first focal length and a second virtual image distance of the second target point 202 corresponding to the second focal length.

[0034] The preset mapping relationship refers to a one-to-one correspondence between different focal lengths and virtual image distances.

[0035] It should be noted that the above mapping relationship can be established and configured before S301. Figure 5As shown, a test chart 501 can be set on a slide rail 502, and the test chart 501 can slide back and forth on the slide rail 502. The detection camera 101 is directly opposite to the test chart 501. The slide rail 502 can collect the distance between the test chart 501 and the detection camera 101, and transmit the collected distance to the detection camera 101. Specifically, the process of configuring the mapping relationship may include:

[0036] Step 1: At each distance between the detection camera 101 and the test chart 501 , the detection camera 101 captures the display interface of the test chart 501 based on different focal lengths.

[0037] Specifically, when the distance between the detection camera 101 and the test chart 501 is distance 1, the display interface of the test chart 501 is shot based on different focal lengths; when the distance between the detection camera 101 and the test chart 501 is distance 2, the display interface of the test chart 501 is shot based on different focal lengths; and when the distance between the detection camera 101 and the test chart 501 is distance N, the display interface of the test chart 501 is shot based on different focal lengths.

[0038] Step 2: The detection camera 101 determines the focal length that makes the display interface of the test chart 501 clearest.

[0039] For example, when the distance between the detection camera 101 and the test chart 501 is distance 1, the detection camera 101 determines the focal length that makes the display interface of the test chart 501 clearest; for another example, when the distance between the detection camera 101 and the test chart 501 is distance 2, the detection camera 101 determines the focal length that makes the display interface of the test chart 501 clearest.

[0040] Step 3: Establish a mapping relationship between the focal length that makes the display interface of the test chart 501 clearest and the distance between the detection camera 101 and the test chart 501 .

[0041] For example, when the distance between the detection camera 101 and the test chart 501 is distance 1, the focal length at which the display interface of the test chart 501 is clearest is focal length 1, and a mapping relationship between distance 1 and focal length 1 is established (wherein, the virtual image distance can be understood as the distance between the detection camera 101 and the virtual image of the actual object on the lens; the test chart 501 can be understood as a simulated virtual image, and distance 1 can be understood as the virtual image distance); when the distance between the detection camera 101 and the test chart 501 is distance 2, the focal length at which the display interface of the test chart 501 is clearest is focal length 2, and a mapping relationship between distance 2 and focal length 2 is established (distance 2 can be understood as virtual image distance 2). In this way, a mapping relationship between different distances (i.e., virtual image distances) and focal lengths can be established.

[0042] S302: the detection camera 101 photographs the display interface of the display screen 103 through the lens 102 according to the focal length corresponding to the second virtual image distance to obtain a first photograph.

[0043] S303: the detection camera 101 determines the offset angle of the display screen 103 according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point 201 and the second target point 202 in the first captured photo.

[0044] Specifically, Figure 1 As shown, in some embodiments, S403 can be implemented as follows: the detection camera 101 determines the offset angle of the display screen 103 according to the formula tanβ=(bc) / {(O″B″×c / f)+[(O″B″×c / f)×(bc) / c]}. Wherein, β is the offset angle of the display screen 103, b is the first virtual image distance of the first target point 201, c is the second virtual image distance of the second target point 202, O″B″ is the distance between the first target point 201 and the second target point 202 in the first captured photo, and f is the focal length corresponding to the second virtual image distance.

[0045] Specifically, the first virtual image distance of the first target point 201 and the second virtual image distance of the second target point 202 can be obtained based on the above step S301, the distance between the first target point 201 and the second target point 202 in the first captured photo can be identified, and the focal length corresponding to the second virtual image distance can be identified.

[0046] The derivation process of the formula tanβ=(bc) / {(O″B″×c / f)+[(O″B″×c / f)×(bc) / c]} can be:

[0047] like Figure 1 As shown, when the first target point 201 is farther away from the lens 102 than the second target point 202, the first target point 201 is point B, and the point projected onto the horizontal plane by point B is point D. The second target point 202 is point O, the second virtual image distance of the second target point 202 is c, and the first virtual image distance of the first target point 201 is b, then BD is equal to bc; in addition, in the first shot taken by the detection camera 101, the first target point 201 is point B″, the second target point 202 is point O″, and the light focus point of the detection camera 101 is P. It can be understood that the triangle BDB ′ With triangle B ′ OP is similar, then Since BD = bc, OP = c, then DB' = OB' x (bc) / c, and since OD = OB' + DB' = OB' + OB' x (bc) / c, f / c = O"B" / O ′ B′ , then O ′ B ′ =O″B″×f / c, and then OD=O″B″×f / c+[O″B″×f / c×(bc) / c], then

[0048] Similarly, if Figure 1 As shown, in other embodiments, when the first target point 201 is closer to the lens 102 than the second target point 202, the detection camera 101 can also calculate the value according to the formula Determine the offset angle of the display screen 103, where β is the offset angle of the display screen 103, a is the first virtual image distance of the first target point 201, c is the second virtual image distance of the second target point 202, O″A″ is the distance between the first target point 201 and the second target point 202 in the first captured photo, and f is the focal length corresponding to the second virtual image distance.

[0049] Specifically, the formula The derivation process is as follows: the first target point 201 is point A, and the point projected onto the horizontal plane by point A is point C. The second target point 202 is point O, the second virtual image distance of the second target point 202 is c, and the first virtual image distance of the first target point 201 is a, then AD is equal to ca; in addition, in the first photograph taken by the detection camera 101, the first target point 201 is point A″, the second target point 202 is point O″, and the light focusing point of the detection camera 101 is P. It can be understood that the triangle ACA ′ With triangle A ′ OP is similar, then Then CA'=OA'×(ca) / c, and since f / c=O″A″ / O ′ A ′ , then OA ′ =O″A″×f / c, then CA'=O″A″×f / c×(ca) / c, and since OC=OA ′ -CA', then OC=O″A″×f / cO″A″×f / c×(ca) / c, then

[0050] like Figure 6As shown, the embodiment of the present application also provides an angle detection device 600 for the offset of a display screen, which is configured on the detection camera 101. It should be noted that the basic principle and technical effect of the angle detection device 600 for the offset of a display screen provided in the embodiment of the present application are the same as those in the above-mentioned embodiment. For the sake of brief description, for parts not mentioned in the embodiment of the present application, reference can be made to the corresponding contents in the above-mentioned embodiment. The detection camera 101 is used for angle detection of the offset of a display screen. The angle detection system for the offset of a display screen also includes a lens 102 and a display screen 103. The detection camera 101, the lens 102 and the display screen 103 are arranged in sequence at intervals. The display interface of the display screen 103 includes a first target point 201 and a second target point 202, wherein the second target point 202 is on the optical axis of the detection camera 101. Specifically, the device 600 provided in the embodiment of the present application includes a virtual image distance determination unit 601, a photo shooting unit 602, and an offset angle determination unit 603, wherein,

[0051] The virtual image distance determining unit 601 is used to determine a first virtual image distance of the first target point 201 and a second virtual image distance of the second target point 202 .

[0052] The photo shooting unit 602 is used to shoot the display interface of the display screen 103 through the lens 102 according to the focal length corresponding to the second virtual image distance to obtain a first shot photo.

[0053] The offset angle determination unit 603 is used to determine the offset angle of the display screen 103 according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point 201 and the second target point 202 in the first captured photo.

[0054] In some embodiments, the first target point 201 is farther away from the lens 102 than the second target point 202, and the offset angle determination unit 603 is specifically used to determine the offset angle of the display screen 103 according to the formula tanβ=(bc) / {(O″B″×c / f)+[(O″B″×c / f)×(bc) / c]}, wherein β is the offset angle of the display screen 103, b is the first virtual image distance of the first target point 201, c is the second virtual image distance of the second target point 202, O″B″ is the distance between the first target point 201 and the second target point 202 in the first captured photo, and f is the focal length corresponding to the second virtual image distance.

[0055] In some embodiments, the first target point 201 is closer to the lens 102 than the second target point 202, and the offset angle determination unit 603 is specifically configured to determine the offset angle according to the formula Determine the offset angle of the display screen 103, where β is the offset angle of the display screen 103, a is the first virtual image distance of the first target point 201, c is the second virtual image distance of the second target point 202, O″A″ is the distance between the first target point 201 and the second target point 202 in the first captured photo, and f is the focal length corresponding to the second virtual image distance.

[0056] In some embodiments, the virtual image distance determination unit 601 is specifically used to capture the display interface of the display screen 103 based on multiple different focal lengths to obtain multiple second captured photos; determine, among the multiple second captured photos, a first focal length corresponding to the second captured photo of the first target point 201 being the clearest and a second focal length corresponding to the second captured photo of the second target point 202 being the clearest; and determine, based on a preset mapping relationship, a first virtual image distance of the first target point 201 corresponding to the first focal length and a second virtual image distance of the second target point 202 corresponding to the second focal length.

[0057] In some implementations, the apparatus 600 provided in the embodiment of the present application further includes:

[0058] The relationship establishing unit is used to shoot the display interface of the test chart 501 based on different focal lengths at each distance between the detection camera 101 and the test chart 501; determine the focal length that makes the display interface of the test chart 501 clearest; and establish a mapping relationship between the focal length that makes the display interface of the test chart 501 clearest and the distance between the detection camera 101 and the test chart 501.

[0059] In the above description, the technical details such as the patterning of each layer are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. In addition, although the various embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

[0060] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for detecting the angle of deviation of a display screen, characterized in that: An angle detection system for the offset of a display screen is provided, the system comprising a detection camera, a lens and a display screen, the detection camera, the lens and the display screen are arranged in sequence and spaced apart, the display interface of the display screen comprises a first target point and a second target point, wherein the second target point is on the optical axis of the detection camera, and the method comprises: The detection camera determines a first virtual image distance of the first target point and a second virtual image distance of the second target point; The detection camera photographs the display interface of the display screen through the lens according to the focal length corresponding to the second virtual image distance to obtain a first photograph; The detection camera determines the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo.

2. The method according to claim 1, characterized in that The first target point is farther from the lens than the second target point, and the detection camera determines the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo, including: The detection camera is based on the formula tanβ=(bc) / {(O ″ B ″ ×c / f)+[(O ″ B ″ ×c / f)×(bc) / c]}, determine the offset angle of the display screen, wherein β is the offset angle of the display screen, b is the first virtual image distance of the first target point, c is the second virtual image distance of the second target point, O ″ B ″ is the distance between the first target point and the second target point in the first photograph, and f is the focal length corresponding to the second virtual image distance.

3. The method according to claim 1, characterized in that The first target point is closer to the lens than the second target point, and the detection camera determines the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo, including: The detection camera is based on the formula Determine the offset angle of the display screen, wherein β is the offset angle of the display screen, a is the first virtual image distance of the first target point, c is the second virtual image distance of the second target point, and ″ A ″ is the distance between the first target point and the second target point in the first photograph, and f is the focal length corresponding to the second virtual image distance.

4. The method according to claim 1, characterized in that The detection camera determines a first virtual image distance of the first target point and a second virtual image distance of the second target point, including: The detection camera photographs the display interface of the display screen based on a plurality of different focal lengths to obtain a plurality of second photographs; The detection camera determines, among the plurality of second photographs, a first focal length corresponding to the second photograph in which the first target point is clearest, and a second focal length corresponding to the second photograph in which the second target point is clearest; The detection camera determines, according to a preset mapping relationship, a first virtual image distance of the first target point corresponding to the first focal length and a second virtual image distance of the second target point corresponding to the second focal length.

5. The method according to claim 4, characterized in that Before the detection camera determines a first virtual image distance of the first target point and a second virtual image distance of the second target point, the method further includes: At each distance between the detection camera and the test chart, the detection camera photographs the test chart based on different focal lengths; The detection camera determines a focal length that makes the test chart clearest; A mapping relationship between the focal length that makes the test chart clearest and the distance between the detection camera and the test chart is established.

6. A device for detecting the angle of deviation of a display screen, characterized in that: The detection camera is configured to be applied to the angle detection system of the offset of the display screen, the angle detection system of the offset of the display screen also includes a lens and a display screen, the detection camera, the lens and the display screen are sequentially arranged at intervals, the display interface of the display screen includes a first target point and a second target point, wherein the second target point is on the optical axis of the detection camera, and the device includes: A virtual image distance determining unit, used to determine a first virtual image distance of the first target point and a second virtual image distance of the second target point; a photo shooting unit, configured to shoot a display interface of the display screen through the lens according to the focal length corresponding to the second virtual image distance, to obtain a first shot photo; The offset angle determination unit is used to determine the offset angle of the display screen according to the focal length corresponding to the second virtual image distance, the first virtual image distance, the second virtual image distance, and the distance between the first target point and the second target point in the first captured photo.

7. The device according to claim 6, characterized in that The first target point is farther from the lens than the second target point, and the offset angle determination unit is specifically configured to determine the offset angle according to the formula tanβ=(bc) / {(O ″ B ″ ×c / f)+[(O ″ B ″ ×c / f)×(bc) / c]}, determine the offset angle of the display screen, wherein β is the offset angle of the display screen, b is the first virtual image distance of the first target point, c is the second virtual image distance of the second target point, O ″ B ″ is the distance between the first target point and the second target point in the first photograph, and f is the focal length corresponding to the second virtual image distance.

8. The device according to claim 6, characterized in that The first target point is closer to the lens than the second target point, and the offset angle determination unit is specifically configured to determine the offset angle according to the formula tan Determine the offset angle of the display screen, wherein β is the offset angle of the display screen, a is the first virtual image distance of the first target point, c is the second virtual image distance of the second target point, and ″ A ″ is the distance between the first target point and the second target point in the first photograph, and f is the focal length corresponding to the second virtual image distance.

9. The device according to claim 6, characterized in that The virtual image distance determination unit is specifically used to shoot the display interface of the display screen based on multiple different focal lengths to obtain multiple second photographs; determine the first focal length corresponding to the second photograph with the clearest first target point and the second focal length corresponding to the second photograph with the clearest second target point among the multiple second photographs; and determine the first virtual image distance of the first target point corresponding to the first focal length and the second virtual image distance of the second target point corresponding to the second focal length according to a preset mapping relationship.

10. The device according to claim 9, characterized in that The device also includes: A relationship establishing unit is used to photograph the test chart based on different focal lengths at each distance between the detection camera and the test chart; determine the focal length that makes the test chart clearest; and establish a mapping relationship between the focal length that makes the test chart clearest and the distance between the detection camera and the test chart.

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