CN211909011U - Camera testing device and system - Google Patents
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- CN211909011U CN211909011U CN202020436964.1U CN202020436964U CN211909011U CN 211909011 U CN211909011 U CN 211909011U CN 202020436964 U CN202020436964 U CN 202020436964U CN 211909011 U CN211909011 U CN 211909011U
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Abstract
The application provides a camera testing device and system. The camera testing device comprises an identification piece, a connecting piece and a bearing piece. The identification piece is connected with the bearing piece through a connecting piece, and when the camera to be tested is placed on the bearing piece, the camera to be tested and the identification piece are spaced at a certain distance; the surface of the identification part close to one side of the bearing part is provided with a reference identifier, the reference identifier is used for a camera to be detected to shoot, and image parameters of the camera to be detected are calibrated according to the reference identifier in a shot picture. Since the reference mark can provide a better reference standard, the correction parameters obtained based on the reference mark can have a more accurate adjustment effect on the shot picture.
Description
Technical Field
The application relates to the field of camera testing, in particular to a camera testing device and system.
Background
In broadcast-level augmented reality, an image shot by a camera and a virtual image need to be superimposed and then sent to a viewer, so that the viewer can view a picture formed by combining the virtual image and an actually shot image. In the method, for different shooting scenes, a virtual image adapted to the scene needs to be used, so that the matching effect of the virtual image and the actual shooting scene directly affects the impression effect of the audience. However, problems such as barrel distortion, a shift between the center of the virtual image and the center of the actual shooting scene, inability to obtain a high-precision camera optical center position, and inability to accurately obtain the field angle fov (field view) of the camera lens may occur in the actual shooting process of the camera. At present, aiming at the problems, the correction is mainly carried out through the experience of visual observation of technicians, and the problems of poor correction precision and complex operation exist.
SUMMERY OF THE UTILITY MODEL
In order to overcome at least one of the deficiencies in the prior art, an object of the embodiments of the present application is to provide a camera testing device, which includes a logo, a connector, and a bearing member;
the identification piece is connected with the bearing piece through the connecting piece, and when a camera to be tested is placed on the bearing piece, the camera to be tested and the identification piece are spaced at a certain distance;
the surface of the identification piece, which is close to one side of the bearing piece, is provided with a reference identifier, and the reference identifier is used for shooting the camera to be detected and calibrating the image parameters of the camera to be detected according to the reference identifier in the shot picture.
Optionally, the connecting member has a telescopic structure, so that the bearing member can approach or depart from the identification member along a telescopic direction through the connecting member.
Optionally, the connecting piece is provided with a graduated scale, and the graduated scale is used for indicating the distance between the lens of the camera to be tested and the identification piece.
Optionally, the connecting piece is further provided with a scale reading unit, and the scale reading unit is used for indicating a corresponding position of the lens of the camera to be detected on the scale;
one end of the scale reading unit is connected with the graduated scale and can slide along the measuring direction of the graduated scale;
and the other end of the scale reading unit is used for sliding the scale reading unit along the measuring direction of the graduated scale when the distance between the lens of the camera to be tested and the identification piece is read, so that the other end of the scale reading unit is attached to the lens of the camera to be tested.
Optionally, the camera testing device further includes a laser ranging assembly, and the laser ranging assembly is used for acquiring a distance between a lens of the camera to be tested on the bearing member and the identification member.
Optionally, the reference mark includes a first mark and a second mark, and the marking member includes a base, a first marking plate on which the first mark is disposed, and a second marking plate on which the second mark is disposed;
the extending direction of the base is perpendicular to the shooting direction of the camera to be detected, and the orientations of the first mark and the second mark are parallel to the shooting direction;
the first identification plate and the second identification plate are close to or far away from the base along the extending direction of the base so as to adapt to the visual field range of the camera to be tested.
Optionally, a scale value for indicating a distance between the first marking plate and the second marking plate is arranged on the surface of the base along the extending direction of the base;
the first mark and the second mark are coordinate axes respectively, the coordinate axes are parallel to the extending direction of the base, and the coordinate axes and the scale values are matched with each other to indicate the size of the shot part of the mark piece along the extending direction of the base.
Optionally, the first identification plate and the second identification plate are OLED display screens.
Optionally, the reference mark further includes a third mark, and the mark further includes a third mark plate provided with the third mark.
Optionally, the image shot by the camera to be detected is used for overlapping with the virtual image;
the third mark comprises an origin mark and a reference straight line which divides the surface of the third mark plate into a plurality of grids, wherein the origin mark is used for calibrating the center of the virtual image, so that the center of the virtual image is always superposed with the origin mark when the visual field of the camera to be detected changes; and the reference straight line is used for calibrating barrel distortion of the camera to be measured.
Optionally, the third identification plate is an OLED display screen.
The embodiment of the application also provides a camera test system, and the camera test system comprises the camera test device and the camera to be tested.
Compared with the prior art, the method has the following beneficial effects:
the embodiment of the application provides a camera testing device and system. Providing an identification piece provided with a reference identification through the camera testing device for shooting by a camera to be tested; and calibrating the image parameters of the camera to be detected according to the reference identifier in the shot picture to obtain corresponding correction parameters. The correction parameters are used for calibrating the shot images in the subsequent shooting process. Since the reference mark can provide a better reference standard, the correction parameters obtained based on the reference mark can have a more accurate adjustment effect on the shot picture.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a camera testing apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a telescopic structure provided in an embodiment of the present application;
fig. 3 is a schematic view of a scale provided in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a marker provided in an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a calculation method of an optical center and an angle of view according to an embodiment of the present disclosure;
fig. 6 is a second schematic structural view of the identification member according to the embodiment of the present application;
fig. 7 is a schematic diagram of a third identifier provided in an embodiment of the present application.
Icon: 100-camera test equipment; 110-a carrier; 120-a connector; 130-a marker; 1201-telescoping tube; 1202-scale; 1203-scale reading unit; 1301-a base; 1302-a first identification panel; 1303-a second identification plate; 1305-scale values; 1304-coordinate axes; 1306-a third identification plate; 140-lens of camera under test; 1401-optical center; 13061-reference straight line; 13062-origin identification.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience of describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As described in the background art, problems such as barrel distortion, a shift between the center of a virtual image and the center of an actual photographed scene, failure to acquire a high-precision camera optical center position, and failure to accurately acquire a camera lens field angle FOV may occur in a camera during an actual photographing process. At present, aiming at the problems, the correction is mainly carried out through the experience of visual observation of technicians, and the problems of poor correction precision and complex operation exist.
In view of this, the present application provides a camera testing apparatus. Referring to fig. 1, a schematic structural diagram of the camera testing device 100 according to an embodiment of the present disclosure is provided. The camera testing device 100 includes a mark member 130, a connecting member 120, and a carrier member 110.
The identification member 130 is connected to the carrier member 110 through the connecting member 120, and when a camera to be tested is placed on the carrier member 110, the camera to be tested is spaced from the identification member 130 by a certain distance;
the surface of the identification member 130 near the bearing member 110 is provided with a reference identifier, and the reference identifier is used for shooting by the camera to be detected and calibrating the image parameters of the camera to be detected according to the reference identifier in the shot picture.
When the camera testing device 100 is used specifically, the shooting direction of the camera to be tested faces the reference identifier to shoot the camera to be tested, and corresponding parameter adjustment is performed on the camera to be tested according to the state of the reference identifier in the shooting picture. For example, if barrel distortion occurs in the reference mark in the shot picture, corresponding adjustment parameters are set to correct the shot picture so as to eliminate the barrel distortion.
Further, referring to fig. 2, the connecting member 120 has a telescopic structure, so that the carrier 110 can approach or depart from the identification member 130 through the connecting member 120 in a telescopic direction. And, the carrier 110 and the identification member 130 are moved close to or away from each other at the same level by the connection member 120. When calculating the optical center position and the field angle of the camera to be measured, the position of the carrier 110 needs to be adjusted along the connecting member 120, and the distance between the lens of the camera to be measured on the carrier 110 and the identifier 130 is obtained.
Wherein, as a possible embodiment, the connecting member 120 comprises a plurality of telescopic tubes 1201 for the telescopic structure of the connecting member 120. Each bellows 1201 is of the same shape but of a different area from the radially perpendicular cross-section. The extension tube 1201 with the smaller cross section is located in the inner cavity of the extension tube 1201 with the larger area, and the extension tube 1201 with the smaller cross section can slide along the inner wall of the extension tube 1201 with the larger area. The link member 120 is extended and contracted in the radial direction of the telescopic tube 1201 based on the above-described structure.
In order to obtain the distance between the lens of the camera to be tested and the identification member 130, as a possible implementation manner, the connecting member 120 is further provided with a graduated scale 1202 for indicating the distance between the lens of the camera to be tested and the identification member 130. When the camera to be tested carried by the carrier 110 moves along the telescopic direction of the connecting member 120, the distance between the lens of the camera to be tested and the mark member 130 is determined by reading the scale on the scale 1202.
Further, referring to fig. 3, when the camera to be tested shoots the mark, the lens 140 of the camera to be tested needs to be placed at a proper height from the ground, so that the lens 140 of the camera to be tested is aligned with the central area of the mark 130. Since the lens 140 of the camera to be measured is kept at a certain distance from the ground in the vertical direction, a visual error is easily generated when a numerical value on the scale is read.
Based on this, in the embodiment of the present application, the connecting member 120 is further provided with a scale reading unit 1203 for indicating the corresponding position of the lens 140 of the camera to be measured on the scale 1202. One end of the scale reading unit 1203 is connected to the scale 1202 and can slide along the measuring direction of the scale 1202. The other end of the scale reading unit 1203 is used for sliding the scale reading unit 1203 along the measuring direction of the scale 1202 when reading the distance between the lens 140 of the camera to be measured and the identification member 130, so that the other end of the scale reading unit 1203 is attached to the lens 140 of the camera to be measured, and the numerical value on the scale 1202 can be conveniently read.
As another possible embodiment, the camera testing apparatus 100 further includes a laser ranging component, which is used to obtain the distance between the lens 140 of the camera to be tested on the bearing member 110 and the identification member 130. For example, when placing the camera to be tested, the lens 140 of the camera to be tested is placed at a position close to the laser ranging assembly. Because, this laser rangefinder subassembly can the automatic calculation with the distance between the sign board.
For the identifier 130, the specific content of the reference identifier and the specific structure of the identifier 130 may be adjusted accordingly with the specific test content of the camera to be tested. Referring to fig. 4, when testing the optical center position and the field angle of the camera to be tested, the reference mark includes a first mark and a second mark, and the mark 130 includes a base 1301, a first mark plate 1302 with the first mark, and a second mark plate 1303 with the second mark.
The extending direction of the base 1301 is perpendicular to the shooting direction of the camera to be tested, and the orientations of the first identifier and the second identifier are parallel to the shooting direction. The first identification plate 1302 and the second identification plate 1303 are close to or far from each other along the extending direction of the base 1301 through the base 1301, so as to adapt to the visual field range of the camera to be tested. Because the distance between the first identification plate 1302 and the second identification plate 1303 can be adjusted according to the actual view range requirement, the first identification plate 1302 and the second identification plate do not need to occupy a large volume.
In order to enable the first identification plate 1302 and the second identification plate 1303 to approach or separate from each other through the base 1301 along the extending direction of the base 1301, as a possible implementation manner, the base 1301 is provided with a groove along the extending direction of the base 1301, and the first identification plate 1302 and the second identification plate 1303 can be placed in the groove and approach or separate from each other through the groove; and the groove can also stabilize the first identification plate 1302 and the second identification plate 1303 on the base 1301.
Meanwhile, referring to fig. 4 again, in order to facilitate reading the actual size of the photographed portion of the mark member 130 in the extending direction of the base within the visual field. The surface of the base 1301 is provided with a scale 1305 for indicating the distance between the first marking plate 1302 and the second marking plate 1303 along the extending direction of the base 1301, and the first marking and the second marking are coordinate axes 1304 respectively. The coordinate axis 1304 is parallel to the extending direction of the base 1301 and indicates the size of the captured portions of the first and second identification plates 1302 and 1303 along the extending direction of the base 1301.
Therefore, based on the scale value of the surface of the base 1301 and the coordinate axes, the user can obtain the actual size of the photographed portion of the identifier 130 along the extending direction of the base by reading the readings of the coordinate axes 1304 in the photographed image and the distance between the first identifier plate and the second identifier plate.
Fig. 5 is a schematic diagram of calculating an optical center 1401 and an angle of view of the camera according to the embodiment of the present disclosure. Specifically, after the camera to be tested is adjusted to a proper visual field range, the distance z1 between the lens 140 of the camera to be tested and the marker 130 and half x1 of the actual size of the photographed part of the marker 130 in the horizontal direction in the current visual field range are acquired. And adjusting the distance between the lens 140 of the camera to be tested and the marker 130 to z2, and acquiring half x2 of the actual size of the shot part of the marker 130 in the horizontal direction in the current visual field range again. If the distance from the preset position of the camera to be measured to the optical center 1401 is k, the distance from the preset position to the optical center 1401 is k and the field angle FOV is calculated by the following formula:
it should be understood that the field of view of the camera under test is achieved by adjusting the corresponding mechanical structure on the lens 140 of the camera under test, and different indication marks are correspondingly provided in different field of view. However, a certain error exists between the theoretical indication mark and the actual visual field range, and the real visual field range can be obtained through the formula. Repeating the process of calculating the real field angle for multiple times can obtain a field angle test curve indicating the relation between the identifier and the real field angle. The field angle test curve provides a reference for subsequent image capture.
Optionally, referring to fig. 6, the reference mark further includes a third mark, and the mark member 130 further includes a third mark plate 1306 provided with the third mark.
Referring to fig. 7, the third identifier includes an origin identifier 13062 and a reference straight line 13061 dividing the surface of the third identifier 1306 into a plurality of squares for reading a scale value of a size corresponding to a field of view in the lens 140 of the camera to be tested. The reference straight line 13061 is used for calibrating barrel distortion of the camera to be measured; since the image shot by the camera to be detected is used for being superimposed with the virtual image, the origin point identifier 13062 is used for calibrating the center of the virtual image, so that the center of the virtual image always coincides with the origin point identifier 13062 when the field of view of the camera to be detected changes.
Specifically, when barrel distortion of the camera to be measured is corrected, the view range of the camera to be measured is adjusted, and if barrel distortion occurs in a straight line in the third identification plate 1306, corresponding image parameters are adjusted to correct the barrel distortion. Repeating the above test process for many times to obtain barrel distortion curve reflecting visual field range and image parameters. The barrel distortion curve can be used as a reference for subsequent image capture.
Meanwhile, when the origin mark offset phenomenon of the camera to be measured is corrected, the view field of the camera to be measured is adjusted to be minimum, and the position of the third identification plate 1306 on the base 1301 is adjusted, so that in a shot picture, the origin mark 13062 of the third identification plate 1306 coincides with the center of the camera to be measured and the center of the virtual image. Gradually enlarging the visual field range of the camera to be measured, if the center of the virtual image deviates from the original point identifier 13062, adjusting the center position parameter of the virtual image, and then obtaining an original point identifier curve reflecting the relationship between the visual field range and the center position parameter. The origin identification curve can be used as a reference for subsequent image capture.
As a possible implementation manner, the specific materials of the first identification plate, the second identification plate 1303 and the third identification plate 1306 may be an OLED display screen. The OLED display screen can display different types of reference marks according to specific test requirements.
As another possible embodiment, the specific material of the first identification plate 1302, the second identification plate 1303 and the third identification plate 1306 can be a plastic plate provided with a reference mark. Since the plastic plate is relatively inexpensive to manufacture, the overall cost of the camera test device 100 can be reduced.
The embodiment of the present application further provides a camera testing system, which includes the camera testing apparatus 100 and a camera to be tested.
In summary, the embodiments of the present application provide a camera testing apparatus and system. Providing a camera to be tested provided with a reference mark through the camera testing device for shooting; and calibrating the image parameters of the camera to be detected according to the reference identifier in the shot picture to obtain corresponding correction parameters. The correction parameters are used for calibrating the shot images in the subsequent shooting process. Since the reference mark can provide a better reference standard, the correction parameters obtained based on the reference mark can have a more accurate adjustment effect on the shot picture.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. The camera testing device is characterized by comprising an identification piece, a connecting piece and a bearing piece;
the identification piece is connected with the bearing piece through the connecting piece, and when a camera to be tested is placed on the bearing piece, the camera to be tested and the identification piece are spaced at a certain distance;
the surface of the identification piece, which is close to one side of the bearing piece, is provided with a reference identifier, and the reference identifier is used for shooting the camera to be detected and calibrating the image parameters of the camera to be detected according to the reference identifier in the shot picture.
2. The camera testing device as claimed in claim 1, wherein the connecting member has a telescopic structure such that the carrier member can approach or depart from the identification member through the connecting member in a telescopic direction.
3. The camera testing device as claimed in claim 2, wherein the connecting member is provided with a graduated scale for indicating a distance between the lens of the camera under test and the marking member.
4. The camera testing device as claimed in claim 3, wherein the connecting member is further provided with a scale reading unit for indicating a corresponding position of the lens of the camera to be tested on the scale;
one end of the scale reading unit is connected with the graduated scale and can slide along the measuring direction of the graduated scale;
and the other end of the scale reading unit is used for sliding the scale reading unit along the measuring direction of the graduated scale when the distance between the lens of the camera to be tested and the identification piece is read, so that the other end of the scale reading unit is attached to the lens of the camera to be tested.
5. The camera testing device of claim 2, further comprising a laser ranging assembly for obtaining a distance between a lens of the camera to be tested on the carrier and the identifier.
6. The camera testing device according to claim 2, wherein the reference mark comprises a first mark and a second mark, and the marking member comprises a base, a first marking plate provided with the first mark, and a second marking plate provided with the second mark;
the extending direction of the base is perpendicular to the shooting direction of the camera to be detected, and the orientations of the first mark and the second mark are parallel to the shooting direction;
the first identification plate and the second identification plate are close to or far away from the base along the extending direction of the base so as to adapt to the visual field range of the camera to be tested.
7. The camera testing device according to claim 6, wherein the surface of the base is provided with a scale value for indicating the distance between the first marking plate and the second marking plate along the extension direction of the base;
the first mark and the second mark are coordinate axes respectively, the coordinate axes are parallel to the extending direction of the base, and the coordinate axes and the scale values are matched with each other to indicate the size of the shot part of the mark piece along the extending direction of the base.
8. The camera testing device of claim 6, wherein the first and second indicator panels are OLED display screens.
9. The camera testing device of claim 1, wherein the reference mark further comprises a third mark, and the marking member further comprises a third marking plate provided with the third mark.
10. The camera testing device of claim 9, wherein the image captured by the camera under test is used to overlay a virtual image;
the third mark comprises an origin mark and a reference straight line which divides the surface of the third mark plate into a plurality of grids, wherein the origin mark is used for calibrating the center of the virtual image, so that the center of the virtual image is always superposed with the origin mark when the visual field of the camera to be detected changes; and the reference straight line is used for calibrating barrel distortion of the camera to be measured.
11. The camera testing device of claim 9, wherein the third identification panel is an OLED display screen.
12. A camera test system, characterized in that the camera test system comprises a camera test device according to any one of claims 1-11 and a camera under test.
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| CN202020436964.1U CN211909011U (en) | 2020-03-30 | 2020-03-30 | Camera testing device and system |
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| CN202020436964.1U CN211909011U (en) | 2020-03-30 | 2020-03-30 | Camera testing device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432204A (en) * | 2020-03-30 | 2020-07-17 | 杭州栖金科技有限公司 | Camera testing device and system |
| CN113382166A (en) * | 2021-06-08 | 2021-09-10 | 北京房江湖科技有限公司 | Optical center alignment method and device for image pickup equipment, storage medium and electronic equipment |
-
2020
- 2020-03-30 CN CN202020436964.1U patent/CN211909011U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432204A (en) * | 2020-03-30 | 2020-07-17 | 杭州栖金科技有限公司 | Camera testing device and system |
| CN113382166A (en) * | 2021-06-08 | 2021-09-10 | 北京房江湖科技有限公司 | Optical center alignment method and device for image pickup equipment, storage medium and electronic equipment |
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Address after: Room 312, Building 7, No. 6 Beichen Road, Yangsong Town, Huairou District, Beijing 101400 Patentee after: Beijing Qijin Culture Technology Co.,Ltd. Address before: 310005 Room 201, East unit, building 66, Cangji new village, Hushu street, Gongshu District, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Qijin Technology Co.,Ltd. |