CN108665445B - Method and device for detecting image distortion and head-mounted display equipment - Google Patents
Method and device for detecting image distortion and head-mounted display equipment Download PDFInfo
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- CN108665445B CN108665445B CN201810343865.6A CN201810343865A CN108665445B CN 108665445 B CN108665445 B CN 108665445B CN 201810343865 A CN201810343865 A CN 201810343865A CN 108665445 B CN108665445 B CN 108665445B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
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Abstract
The invention discloses a method and a device for detecting image distortion and a head-mounted display device. The method comprises the following steps: constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to obtain a first distorted image; inputting an original image output by a game engine into an application program of the head-mounted display device, and acquiring a second distorted image output by the application program of the head-mounted display device; and taking the first distorted image as a basis for verifying image distortion, verifying whether the second distorted image is matched with the first distorted image, and if the second distorted image is matched with the first distorted image, determining that the distorted image output by the application program of the head-mounted display equipment is correct. Therefore, the method and the device are convenient for quality testing personnel wearing the display equipment to quickly detect unqualified products, and improve the working efficiency of the quality testing personnel.
Description
Technical Field
The invention relates to the field of image processing, in particular to a method and a device for detecting image distortion and a head-mounted display device.
Background
With the increasing number of Virtual Reality (VR) application games, consumers have placed higher demands on the immersion of head-mounted display devices. Only by enabling the head-mounted display device to cover the visual range of human eyes as much as possible, the user can be visually provided with a real sense of immersion. At present, the main means for making the head-mounted display device cover the visual range of human eyes as much as possible are: firstly, a specific spherical radian lens is installed on the head-mounted display equipment, then an application program of the head-mounted display equipment utilizes a specific distortion algorithm to carry out distortion processing on an image to be displayed, the image is distorted, and finally the distorted image is projected to human eyes through the specific spherical radian lens, so that the human eyes can watch a normal image, and thus people can feel real position projection and coverage of a large visual angle range, and the immersion feeling is enhanced. If the distortion processing of the image to be displayed by the application program of the head-mounted display equipment is correct, the user has stronger immersion in vision, and the user experience is improved; if the distortion processing performed on the image to be displayed by the application program of the head-mounted display device is incorrect, the user visually has a weak immersion feeling, and the user experience is reduced. Therefore, in VR technology development, it is important to check whether a distorted image output by an application program of a head-mounted display device is correct, but in the prior art, it is not possible to check whether a distorted image output by an application program of a head-mounted display device is correct.
Disclosure of Invention
The invention provides a method and a device for detecting image distortion and a head-mounted display device, which aim to solve the problems.
According to an aspect of the present invention, there is provided a method of inspecting image distortion, the method comprising:
constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to obtain a first distorted image; inputting an original image output by the game engine to an application program of a head-mounted display device, and acquiring a second distorted image output by the application program of the head-mounted display device;
taking the first distorted image as a basis for detecting image distortion; and checking whether the second distorted image is matched with the first distorted image, and if the second distorted image is matched with the first distorted image, determining that the distorted image output by an application program of the head-mounted display device is correct.
According to another aspect of the present invention, there is provided an apparatus for inspecting image distortion, the apparatus comprising:
the game system comprises a first distorted image acquisition unit, a second distorted image acquisition unit and a third distorted image acquisition unit, wherein the first distorted image acquisition unit is used for constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to acquire a first distorted image;
a second distorted image obtaining unit, which is used for inputting the original image output by the game engine to an application program of a head-mounted display device and obtaining a second distorted image output by the application program of the head-mounted display device;
an image distortion checking unit for checking the first distorted image as a basis for checking image distortion; and checking whether the second distorted image is matched with the first distorted image, and if the second distorted image is matched with the first distorted image, determining that the distorted image output by an application program of the head-mounted display device is correct.
According to a further aspect of the present invention, there is provided an apparatus for inspecting image distortion, the apparatus comprising a memory and a processor, the memory storing a computer program executable by the processor, the computer program when executed by the processor being operable to perform the method steps described above.
According to yet another aspect of the present invention, there is provided a head mounted display device comprising the above apparatus for checking image distortion.
The invention has the beneficial effects that: the technical scheme of the invention is that an optical lens model constructed according to preset optical lens parameters is used for carrying out distortion processing on an original image output by a game engine to obtain a first distorted image; meanwhile, an original image output by the game engine is input to an application program of the head-mounted display device, a second distorted image output by the application program of the head-mounted display device is obtained, then the second distorted image is matched with the first distorted image, and the first distorted image is distorted through an optical lens and is real in theory, so that the first distorted image can be used as a basis for detecting image distortion, and if the first distorted image is matched with the first distorted image, the distorted image output by the application program of the head-mounted display device is determined to be correct. Therefore, the technical scheme of the invention solves the technical problem that whether the distorted image output by the application program of the head-mounted display equipment is correct or not in the prior art, is convenient for quality control personnel of the head-mounted display equipment to quickly detect unqualified products, and improves the working efficiency of the quality control personnel.
Drawings
FIG. 1 is a flow chart of a method of verifying image distortion according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a method of acquiring a first distorted image according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a method of acquiring a second distorted image according to one embodiment of the present invention;
FIG. 4 is a functional block diagram of an apparatus for detecting image distortion according to an embodiment of the present invention;
FIG. 5 is a functional block diagram of another apparatus for inspecting image distortion according to an embodiment of the present invention;
fig. 6 is a functional structure diagram of a head-mounted display device according to an embodiment of the present invention.
Detailed Description
The design concept of the invention is as follows: aiming at the technical problem that whether a distorted image output by an application program of head-mounted display equipment is correct or not cannot be checked in the prior art, the inventor thinks that an optical lens model is built according to preset optical lens parameters, and the original image output by a game engine is distorted by the optical lens model to obtain a first distorted image; inputting an original image output by a game engine into an application program of the head-mounted display device, and acquiring a second distorted image output by the application program of the head-mounted display device; and taking the first distorted image as a basis for verifying image distortion, verifying whether the two distorted images are matched, and if the two distorted images are matched, determining that the distorted image output by the application program of the head-mounted display equipment is correct.
Example one
Fig. 1 is a flowchart of a method of checking image distortion according to an embodiment of the present invention, as shown in fig. 1, the method of checking image distortion includes:
s110, constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to obtain a first distorted image;
in this embodiment, different optical lenses have different optical lens parameters, and first, an optical lens model is constructed according to preset optical lens parameters, and then, an original image output by a game engine (for example, unity3D) is subjected to distortion processing by using the optical lens model to obtain a first distorted image.
And S120, inputting the original image output by the game engine into an application program of the head-mounted display device, and acquiring a second distorted image output by the application program of the head-mounted display device.
And S130, the first distorted image is used as a basis for verifying image distortion, whether the second distorted image is matched with the first distorted image or not is verified, and if the second distorted image is matched with the first distorted image, the distorted image output by the application program of the head-mounted display equipment is determined to be correct.
The original image output by the game engine may be distorted in a pincushion shape after passing through an optical lens (e.g., fresnel lens). If it is desired to counteract this distortion, it is necessary that the original image output by the game engine be a barrel-shaped distortion image so that the original image output by the game engine, after passing through the optical lens, shows a graphical image that is normally viewed by the human eye. As shown in fig. 2, the original image output from the game engine can generate a barrel distortion map, i.e., a first distortion image, after passing through the optical lens. The barrel-shaped distortion map is theoretically true and can be used as a reference.
Therefore, the technical scheme of the invention utilizes the optical lens model constructed according to the preset optical lens parameters to carry out distortion processing on the original image output by the game engine to obtain a first distorted image; meanwhile, an original image output by the game engine is input to an application program of the head-mounted display device, a second distorted image output by the application program of the head-mounted display device is obtained, and then the second distorted image is matched with the first distorted image. Therefore, the technical scheme of the invention solves the technical problem that whether the distorted image output by the application program of the head-mounted display equipment is correct or not in the prior art, is convenient for quality control personnel of the head-mounted display equipment to quickly detect unqualified products, and improves the working efficiency of the quality control personnel.
In this embodiment, acquiring the second distorted image output by the application program of the head-mounted display device includes: and the head-mounted display device application program carries out distortion processing on the original image output by the game engine according to the distortion mapping relation and additionally introduced distortion factors to obtain a second distorted image.
The distortion mapping equation is used to represent the corresponding relationship between the vertex coordinates of the original image output by the game engine and the rendering Texture (Render Texture) coordinates, and the rendering Texture (Render Texture) is a unity professional function. In this embodiment, the distortion mapping relation is a polynomial function f (x), such as f (x) a0+a1(x-x1)+a2(x-x2)^2+a3(x-x3)^3···+an(x-xn) And ^ n (formula one), additionally introducing distortion factors comprising field angle (FOV), Interpupillary Distance (IPD), projection conversion from three-dimensional space to two-dimensional space and the like. Fig. 2 is a schematic diagram of acquiring a first distorted image according to an embodiment of the present invention, and as shown in fig. 2, it is assumed that "RT 1280x 1280" is an original image output by a game engine, and a vertex data group of "RT 1280x 1280" is subjected to Distortion mapping by a Distortion mapping relation f (x) to obtain vertex data of a "departure image", where the vertex data of the "departure image" is a vertex data group available for OpenGLES, where opengl (open Graphics library) refers to a professional graphical programming interface defining a cross-platform programming language specification. The method is used for three-dimensional images (two-dimensional images can also be used), and is a bottom layer graphic library which is powerful and convenient to call. OpenGL ES (OpenGL for Embedded Systems) is a subset of OpenGL three-dimensional graphics APIs, which is a call interface that an operating system leaves for an application program, and the application program makes the operating system execute commands (actions) of the application program by calling the API of the operating system. And introducing additional Distortion factors (such as field angle FOV, interpupillary distance IPD, and projection conversion from three-dimensional space to two-dimensional space) to process vertex data of the "Distortion image" to obtain a distorted image "Finnal image" output by an application program of the head-mounted display device, wherein the "Finnal image" is a second distorted image.
It should be noted that there are many ways to determine the distortion mapping equation, and the way to determine the distortion mapping equation in this embodiment is: selecting N vertexes on an original image output by a game engine, and acquiring a coordinate set Rp of the N vertexes; simultaneously acquiring a coordinate set Rr corresponding to N vertexes of the original image after passing through an optical lens model, respectively substituting the coordinate set Rp and the coordinate set Rr into a polynomial function f (x) to obtain two equation sets, and simultaneously calculating the two equation sets to obtain parameter values of the polynomial function f (x), such as a finally obtained distortion mapping relation:
f(x)＝2.04444x6-5.3318x5+5.5133x4-2.4742x3+0.7041x2-0.0493x +1.0001 (equation two).
In this embodiment, the method shown in fig. 1 further includes: if the second distorted image is not matched with the first distorted image, it indicates that the Distortion processing error of the application program of the head-mounted display device on the original image output by the game engine is performed, and in order to further analyze the reason of the Distortion processing error of the head-mounted display device, a Distortion mapping relation preset in the application program of the head-mounted display device is called, as above, the Distortion mapping relation is f (x), the Distortion mapping relation f (x) is used to perform Distortion processing on the original image output by the game engine, and a third distorted image is obtained, as still shown in fig. 3, the third distorted image is a "Distortion image";
and checking whether the third Distortion image 'is matched with the first Distortion image, and if the third Distortion image' is matched with the first Distortion image, determining that a Distortion mapping relation in an application program of the head-mounted display equipment is correct, and the additionally introduced Distortion factor in the application program of the head-mounted display equipment is incorrect. If the third distorted image does not match the first distorted image, it is determined that the distortion mapping relation in the application of the head mounted display device is incorrect.
Therefore, according to the technical scheme, whether the distorted image output by the application program of the head-mounted display equipment is correct or not can be checked, and the specific reason why the distorted image output by the application program of the head-mounted display equipment is incorrect can be analyzed, so that the technical personnel can conveniently mark the problems of the unqualified products, and can conveniently perform targeted factory return processing on the unqualified products, and the working efficiency of the technical personnel is improved.
In this embodiment, in the process of checking whether the second distorted image is matched with the first distorted image and checking whether the third distorted image is matched with the first distorted image, the shape, the size and the edge variation amplitude of the first distorted image, the second distorted image and the third distorted image are respectively obtained, then whether the shape, the size and the edge variation amplitude of the second distorted image are consistent with those of the first distorted image is judged, and if yes, the second distorted image is determined to be matched with the first distorted image; if not, determining that the second distorted image is not matched with the first distorted image; judging whether the shape, size and edge change amplitude of the third distorted image are consistent with those of the first distorted image, and if so, determining that the third distorted image is matched with the first distorted image; if not, determining that the third distorted image is not matched with the first distorted image, namely, acquiring the shape, the size and the edge variation amplitude of the two distorted images to be verified, judging whether the shape, the size and the edge variation amplitude of the two distorted images are consistent or not, and if so, determining that the two distorted images are matched; if not, the two distorted images are determined not to be matched, so that the method provides guarantee for checking whether the distorted image output by the application program of the head-mounted display equipment is correct and the reason for the distorted image error output by the application program of the head-mounted display equipment is wrong, and improves the accuracy.
Example two
Fig. 4 is a functional structure diagram of an apparatus for inspecting image distortion according to an embodiment of the present invention, and as shown in fig. 4, the apparatus 400 for inspecting image distortion includes:
a first distorted image obtaining unit 410, configured to construct an optical lens model according to preset optical lens parameters, and perform distortion processing on an original image output by the game engine using the optical lens model to obtain a first distorted image; a second distorted image obtaining unit 430, configured to input the original image output by the game engine to an application program of the head-mounted display device, and obtain a second distorted image output by the application program of the head-mounted display device;
and an image distortion checking unit 420 for checking whether the second distorted image matches the first distorted image by using the first distorted image as a basis for checking image distortion, and determining that the distorted image output by the application program of the head-mounted display device is correct if the second distorted image matches the first distorted image.
In this embodiment, the second distorted image obtaining unit 430 is specifically configured to perform distortion processing on the original image output by the game engine by the head-mounted display device application according to the distortion mapping relation and an additionally introduced distortion factor, so as to obtain a second distorted image.
In this embodiment, the apparatus further includes:
a third distorted image obtaining unit 440, configured to, if the second distorted image does not match the first distorted image, call a distortion mapping relation preset in an application program of the head-mounted display device, perform distortion processing on an original image output by the game engine using the distortion mapping relation, and obtain a third distorted image;
the image distortion checking unit 420 is further configured to check whether the third distorted image matches the first distorted image, and if the third distorted image matches the first distorted image, determine that a distortion mapping relation in the application program of the head-mounted display device is correct, and determine that a distortion factor additionally introduced in the application program of the head-mounted display device is incorrect.
In this embodiment, the image distortion checking unit 420 is further configured to determine that the distortion mapping relation in the application program of the head-mounted display device is incorrect if the third distorted image does not match the first distorted image.
In this embodiment, the image distortion checking unit 420 is specifically configured to obtain the shape, size, and edge variation amplitude of two distorted images to be checked, determine whether the shape, size, and edge variation amplitude of the two distorted images are consistent, and if so, determine that the two distorted images are matched; if not, determining that the two distorted images do not match.
It should be noted that the working process of the apparatus 500 for checking image distortion claimed in this embodiment is the same as the implementation steps of each embodiment of the method shown in fig. 1, and the description of the same parts is omitted.
EXAMPLE III
Fig. 5 is a functional structure diagram of another apparatus for checking image distortion according to an embodiment of the present invention, as shown in fig. 5, the apparatus 500 for checking image distortion includes a memory 520 and a processor 510, the memory 520 stores a computer program capable of being executed by the processor 510, and the computer program is capable of implementing the method steps shown in fig. 1 when executed by the processor 510.
The memory 520 is communicatively coupled to the processor 510 via an internal bus 530. in one embodiment of the present invention, the memory 520 stores a computer program 521 for detecting image distortion.
In various embodiments, memory 520 may be a memory or a non-volatile memory. Wherein the non-volatile memory may be: a storage drive (e.g., hard disk drive), a solid state drive, any type of storage disk (e.g., compact disk, DVD, etc.), or similar storage medium, or a combination thereof. The memory may be: RAM (random Access Memory), volatile Memory, nonvolatile Memory, and flash Memory. Further, the non-volatile memory and internal memory serve as a machine readable storage medium on which a computer program 521 for verifying image distortion for execution by the processor 510 may be stored.
It should be noted that the working process of the apparatus 500 for checking image distortion claimed in this embodiment is the same as the implementation steps of each embodiment of the method shown in fig. 1, and the description of the same parts is omitted.
Example four
Fig. 6 is a functional structure diagram of a head-mounted display device according to an embodiment of the present invention, and as shown in fig. 6, the head-mounted display device 600 includes an apparatus 400/500 for checking image distortion as shown in fig. 4 or fig. 5.
It should be noted that the working process of the apparatus 400/500 for detecting image distortion corresponds to the implementation steps of the method for detecting image distortion shown in fig. 1, and the same contents are not repeated.
In summary, the technical solution of the present invention utilizes an optical lens model constructed according to preset optical lens parameters to perform distortion processing on an original image output by a game engine, so as to obtain a first distorted image; meanwhile, an original image output by the game engine is input to an application program of the head-mounted display device, a second distorted image output by the application program of the head-mounted display device is obtained, and then the second distorted image is matched with the first distorted image. Therefore, the technical scheme of the invention solves the technical problem that whether the distorted image output by the application program of the head-mounted display equipment is correct or not in the prior art, is convenient for quality control personnel of the head-mounted display equipment to quickly detect unqualified products, and improves the working efficiency of the quality control personnel.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A method of verifying image distortion, the method comprising:
constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to obtain a first distorted image;
inputting an original image output by the game engine to an application program of a head-mounted display device, and acquiring a second distorted image output by the application program of the head-mounted display device;
and taking the first distorted image as a basis for verifying image distortion, verifying whether the second distorted image is matched with the first distorted image, and if the second distorted image is matched with the first distorted image, determining that the distorted image output by an application program of the head-mounted display device is correct.
2. The method of claim 1, wherein the obtaining a second distorted image output by an application of the head mounted display device comprises:
and the head-mounted display equipment application program carries out distortion processing on the original image output by the game engine according to a distortion mapping relation and additionally introduced distortion factors to obtain a second distorted image.
3. The method of claim 1, wherein the method further comprises:
if the second distorted image is not matched with the first distorted image, calling a preset distortion mapping relation in an application program of the head-mounted display device, and carrying out distortion processing on an original image output by the game engine by using the distortion mapping relation to obtain a third distorted image;
checking whether the third distorted image is matched with the first distorted image, and if the third distorted image is matched with the first distorted image, determining that a distortion mapping relation in an application program of the head-mounted display device is correct and a distortion factor additionally introduced in the application program of the head-mounted display device is incorrect; determining that a distortion mapping equation in an application of the head mounted display device is incorrect if the third distorted image does not match the first distorted image.
4. The method of claim 3, wherein the verifying whether the second distorted image matches the first distorted image, and the verifying whether the third distorted image matches the first distorted image comprises:
acquiring the shape, size and edge variation amplitude of two distorted images to be verified, judging whether the shape, size and edge variation amplitude of the two distorted images are consistent or not, and if so, determining that the two distorted images are matched; if not, determining that the two distorted images do not match.
5. An apparatus for verifying image distortion, the apparatus comprising:
the game system comprises a first distorted image acquisition unit, a second distorted image acquisition unit and a third distorted image acquisition unit, wherein the first distorted image acquisition unit is used for constructing an optical lens model according to preset optical lens parameters, and performing distortion processing on an original image output by a game engine by using the optical lens model to acquire a first distorted image;
a second distorted image obtaining unit, which is used for inputting the original image output by the game engine to an application program of a head-mounted display device and obtaining a second distorted image output by the application program of the head-mounted display device;
an image distortion checking unit for checking the first distorted image as a basis for checking image distortion; and checking whether the second distorted image is matched with the first distorted image, and if the second distorted image is matched with the first distorted image, determining that the distorted image output by an application program of the head-mounted display device is correct.
6. The apparatus according to claim 5, wherein the second distorted image obtaining unit is specifically configured to perform distortion processing on the original image output by the game engine by the head-mounted display device application according to a distortion mapping equation and an additionally introduced distortion factor to obtain the second distorted image.
7. The apparatus of claim 6, wherein the apparatus further comprises:
a third distorted image obtaining unit, configured to, if the second distorted image does not match the first distorted image, call a distortion mapping relation preset in an application program of the head-mounted display device, and perform distortion processing on an original image output by the game engine by using the distortion mapping relation to obtain a third distorted image;
the image distortion checking unit is further configured to check whether the third distorted image matches the first distorted image, and if the third distorted image matches the first distorted image, it is determined that a distortion mapping relation in an application program of the head-mounted display device is correct, and a distortion factor additionally introduced in the application program of the head-mounted display device is incorrect; determining that a distortion mapping equation in an application of the head mounted display device is incorrect if the third distorted image does not match the first distorted image.
8. The apparatus according to claim 7, wherein the image distortion checking unit is specifically configured to obtain the shape, size, and edge variation amplitude of two distorted images to be checked, determine whether the shape, size, and edge variation amplitude of the two distorted images are consistent, and if so, determine that the two distorted images match; if not, determining that the two distorted images do not match.
9. An apparatus for examining image distortion, characterized in that the apparatus comprises a memory and a processor, the memory storing a computer program executable by the processor, the computer program, when being executed by the processor, being capable of carrying out the method steps of any one of claims 1-4.
10. A head-mounted display device, characterized in that the head-mounted display device comprises an apparatus for checking image distortion according to any one of claims 5-8 or claim 9.
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