CN210426541U - High-precision return light reflection photogrammetric target - Google Patents
High-precision return light reflection photogrammetric target Download PDFInfo
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- CN210426541U CN210426541U CN201921315619.6U CN201921315619U CN210426541U CN 210426541 U CN210426541 U CN 210426541U CN 201921315619 U CN201921315619 U CN 201921315619U CN 210426541 U CN210426541 U CN 210426541U
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Abstract
The utility model relates to the field of photogrammetry, in particular to a high-precision return light reflection photogrammetry target, which comprises a body and at least two reflection areas arranged on the body, wherein at least one part of the outer surface of the body is one part of a spherical surface, and the spherical surface has a spherical center; the reflecting area is formed on the body, and the reflecting area has a predetermined spatial position relation with the sphere center, and the reflecting area is an area provided with a reflecting mirror and an identification mark on the outer surface of the body. The reflector has a strong light return reflection effect, a high-contrast identification mark image can be obtained through low-intensity exposure, and a high-precision photogrammetric result can be obtained through calculation of the image; meanwhile, the measurement target is provided with the multiple-reflex reflector, so that the photogrammetric target can be accurately measured in a larger range when the photogrammetric camera images at different stations, the photogrammetric target does not need to be manually rotated, and the photogrammetric efficiency is greatly improved.
Description
Technical Field
The utility model relates to a photogrammetry field, in particular to high accuracy return light reflection photogrammetry target.
Background
Photogrammetry is a very common technical means in industrial measurement, and has many aspects influencing the digital industrial photogrammetry precision, such as acquisition and identification of a high-precision mark center image, a high-precision camera calibration algorithm and a calibration device, design and realization of a high-precision mark, uniform adjustment of a light beam method and the like, wherein the high-precision photogrammetry target is a key technology influencing the precision of the high-precision mark.
At present, photogrammetry targets used at home and abroad are low in precision due to the problems of preparation processes, are basically plane single reflector targets, although spherical measurement targets are also applied, the measurement targets are sensitive to external illumination, the contrast between the target edge and the background is not obvious, and the like, so that the photogrammetry precision is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that the contrast between the edge of a spherical measurement target and the background is not obvious and the photogrammetric precision is not high in the prior art, the application provides a high-precision return light reflection photogrammetric target, which specifically comprises the following technical scheme:
a high-precision back-reflection photogrammetric target comprises,
a body, at least a portion of an outer surface of the body being part of a spherical surface, the spherical surface having a spherical center;
at least two reflecting regions formed on the body, wherein the at least two reflecting regions have a predetermined spatial position relationship with the center of sphere, so that when the photogrammetric target is placed in a space, the position of the center of sphere in the space can be obtained through calculation according to the positions of the at least two reflecting regions in the space and the predetermined spatial position relationship;
the reflection area is an area provided with a reflector and an identification mark on the outer surface of the body.
The reflecting mirror is formed by closely arranging a plurality of glass beads on a plane, and the identification mark is an area with a certain shape and color on the surface of the reflecting mirror.
Further, the glass bead light source further comprises a reflection enhancement layer, wherein the reflection enhancement layer is arranged on the outer surface of the body, and the glass beads are arranged on the outer surface of the reflection enhancement layer.
Further, the reflection enhancement layer comprises a base layer, wherein the base layer is arranged on the outer surface of the body, and the outer surface of the base layer forms a supporting surface for supporting the reflection enhancement layer.
The reflecting mirror is circular, and the identification mark is a black ring arranged on the outer surface of the reflecting mirror.
The base layer is a trapezoidal glass round table, and the reflection enhancement layer is a silver coating layer arranged on the outer surface of the base layer.
The spatial position relationship is the distance between the reflection area and the sphere center, the angle formed by the connecting line between the sphere center and a specific point on the reflection area and the reflection area, and the distance between the sphere center and the specific point on the reflection area.
Optionally, the reflectors in each reflection area are all circular, and the distances between the circle centers of the reflectors and the connecting lines between the sphere centers are equal.
And the circle centers of the reflectors are perpendicular to the connecting line between the sphere centers.
Preferably, the reflector comprises five reflecting regions, the reflectors of the five reflecting regions are all circular, the distances between the centers of the five reflectors and the connecting line between the centers of the spheres are equal, and the centers of every two adjacent reflectors and the connecting line between the centers of the spheres are perpendicular to each other.
The photogrammetric target according to the embodiment comprises a body and at least two reflecting areas formed on the body, wherein each reflecting area is provided with a reflecting mirror and an identification mark, the reflecting mirror has a strong light return reflecting effect, a high-contrast identification mark image can be obtained through low-intensity exposure, and a high-precision photogrammetric result can be obtained through calculation of the image; when two or more than two reflection areas are arranged, the measurement target is provided with the multi-reflex reflector, so that the photogrammetric target can be accurately measured in a larger range or even in a 360-degree range when the photogrammetric camera images at different stations, the photogrammetric target does not need to be manually rotated, and the photogrammetric efficiency is greatly improved.
Drawings
Fig. 1 is a schematic view of an overall structure of a measurement target according to an embodiment of the present application;
FIG. 2 is a top view of a measurement target structure according to an embodiment of the present application;
FIG. 3 is a side view of a measurement target structure according to one embodiment of the present application;
FIG. 4 is a schematic diagram of an overall structure of a measurement target according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a reflective area according to another embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
Referring to fig. 1 to 3, in some embodiments of the present invention, a high-precision return-light reflection photogrammetric target includes a body 1, and the overall profile of the body 1 is spherical. That is, at least a part of the outer surface of the body 1 (e.g., an outer surface other than a mirror described below, etc.) is a spherical surface having a spherical center S.
In some embodiments of the present invention, the body 1 may be made of any suitable material. For example, in some embodiments, the body 1 may be made of stainless steel.
At least two reflection regions may be provided on the body 1, and when the photogrammetric target is manufactured, the at least two reflection regions have a predetermined spatial positional relationship with the center of sphere S of the body 1. This can be achieved by controlling the manufacturing process of the photogrammetric target and will not be described in detail here.
Since the spatial positional relationship between the at least two reflection regions and the center of sphere S of the main body 1 is known for the photogrammetric target itself (i.e. the aforementioned predetermined spatial positional relationship), when the photogrammetric target is placed in a certain space, the position of the center of sphere S in the space will be able to be calculated from the positions of the at least two reflection regions in the space and the predetermined spatial positional relationship. And the positions of the at least two reflection areas in the space can be obtained by performing corresponding processing after photographing the photogrammetric target. Therefore, when the photogrammetry target is placed in the space, the photogrammetry target is photogrammetry to obtain the positions of the at least two reflection regions in the space, and then the position of the sphere center S in the space can be obtained by reverse calculation through the positions of the at least two reflection regions in the space and the predetermined spatial position relationship between the at least two reflection regions and the sphere center S.
In the embodiment of the present invention, the aforementioned at least two reflection regions may be in any form as long as they can be identified by photogrammetry. For example, in some embodiments, the reflective region may be a flat surface of known shape (e.g., circular, triangular, polygonal, or other regular or irregular shape) cut into the body 1. In other embodiments, the reflective region may be a region of known shape (e.g., a dot, a line with a direction, an arrow, etc.) and a particular color (e.g., red or other relatively striking color, etc.) disposed (e.g., painted, etc.) on the body 1. Hereinafter, the description will be given by taking the example in which the reflective area is a circular mirror. However, the present invention is not limited to a circular reflector.
Accordingly, the spatial positional relationship between the reflection region and the center of sphere may include any suitable spatial positional relationship between the reflection region and the center of sphere as long as the position of the center of sphere can be calculated by back-deriving from the position of the reflection region using the spatial positional relationship. For example, the distance between the reflection area and the sphere center, the angle between the connecting line between the sphere center and a specific point on the reflection area and the reflection area, the distance between the sphere center and a specific point on the reflection area, the angle and/or distance between the sphere center and a plurality of specific points on the reflection area, and/or any other suitable spatial relationship may be used.
The reflective area is a circular mirror and the identification mark is used as an example for further detailed description.
Example 1
Referring to fig. 1 to 3, in some embodiments of the present invention, a first reflector 10 may be disposed on the body 1. The first mirror 10 is a reflective area as described above. That is, the aforementioned at least two reflection areas may include the first mirror 10. The first reflector 10 may be circular and have a first center a. The first circle center a is a first distance from the sphere center S of the spherical surface, i.e., the length of SA in fig. 1 is the first distance.
The first mirror 10 may have good reflective properties (e.g., may be a mirror surface or other suitable reflective surface) and may be capable of reflecting incident light.
The body 1 may also be provided with a second reflector 20. The second mirror 20 is also a reflective area as described above. That is, the aforementioned at least two reflecting areas may further include the second mirror 20. The second mirror 20 may be circular and have a second center B. The second circle center B is a second distance from the sphere center S of the spherical surface, i.e. the length of SB in fig. 1 is the second distance. The second mirror 20 is perpendicular to the first mirror 10, i.e. the plane in which the second mirror 20 is located is perpendicular to the plane in which the first mirror 10 is located.
The diameter of the second mirror 20 may be equal to the diameter of the first mirror 10. A second distance between the second circle center B and the sphere center S of the spherical surface may be equal to a first distance between the first circle center a and the sphere center S of the spherical surface. Also, a line between the second circle center B and the center S of the spherical surface (i.e., SB in fig. 1) may be perpendicular to a line between the first circle center a and the center S of the spherical surface (i.e., SA in fig. 1). Second mirror 20 may have good reflective properties (e.g., one side of the second mirror may be a mirror or other suitable reflective surface) and may be capable of reflecting incident light.
For example, in the present embodiment, the identification mark on the first reflector 10 is taken as an example, the identification mark is a metal ring 101 disposed on the first reflector 10, the metal ring 101 is black, and is obtained by a blackening or vacuum-plating method, and the thickness of the metal ring is 0.005mm, and the roundness of the inner circle is required to be ± 2 μm. Because the color difference between black and the reflector is the largest when the black and the reflector reflect, the contrast between the target edge (namely the reflector) and the background (namely the identification mark) of the image acquired in the photogrammetry process is more obvious, and the photogrammetry result with high precision can be acquired by calculating the image.
A third reflector 30 may also be provided on the body 1. The third mirror 30 is also a reflective area as described above. That is, the aforementioned at least two reflection areas may further include the third mirror 30. The third reflector 30 may be circular and have a third center of circle C. The third center C is a third distance from the center S of the sphere, i.e., the length of SC in fig. 1 is the third distance. The third mirror 30 is perpendicular to both the first mirror 10 and the second mirror 20, i.e. the plane of the third mirror 30 and the plane of the second mirror 20 and the plane of the first mirror 10 are perpendicular to each other.
The diameter of the third mirror 30 may be equal to the diameter of the first mirror 10 and the diameter of the second mirror 20. The third distance between the third center C and the center S of the spherical surface may be equal to the second distance between the second center B and the center S of the spherical surface and the first distance between the first center a and the center S of the spherical surface, that is, the aforementioned third distance, second distance and first distance are equal to each other. Furthermore, a line between the third center C and the center S of the spherical surface (i.e., SC in fig. 1), a line between the second center B and the center S of the spherical surface (i.e., SB in fig. 1), and a line between the first center a and the center S of the spherical surface (i.e., SA in fig. 1) are perpendicular to each other. That is, SC, SB, and SA in FIG. 1 are perpendicular to each other two by two.
The third mirror 30 may have good reflective properties (e.g., may be a mirror or other suitable reflective surface) and may be capable of reflecting incident light.
In the foregoing embodiments, the photogrammetric target comprises three mirrors formed on the spherical body 1: a first mirror 10, a second mirror 20 and a third mirror 30. The three mirrors 10, 20 and 30 are circular and perpendicular to each other two by two, the center of which is at the same distance from the center of the sphere of the spherical body 1, and the line connecting the center of which to the center of the sphere of the spherical body 1 is perpendicular to each other two by two. Thus, when a photogrammetry is performed, the three mirrors can be photographed at the same time within a certain range that the first mirror 10, the second mirror 20, and the third mirror 30 face. Because the three reflectors are all round, the centers of circles of the three reflectors can be accurately extracted after shooting, and meanwhile, because the mutual relation between the centers of circles of the reflectors and the center of the sphere of the spherical body 1 is constant, the center of the sphere of the spherical body 1 can be conveniently obtained by reverse thrust after the centers of the circles of the three reflectors are obtained, and therefore a good photogrammetric result is obtained. Further, in another certain range where the first mirror 10, the second mirror 20, and the third mirror 30 face, only one or two of the three mirrors may be photographed at a time. In this case, the shooting position may be changed to perform multiple times of shooting, and the image data obtained by the multiple times of shooting may be fused, so long as it is ensured that all the three mirrors are finally shot, the center of the sphere of the spherical body 1 may be calculated by the fused image data in a similar manner as described above.
In some embodiments of the present invention, the first reflector 10, the second reflector 20 and the third reflector 30 may have the same diameter, so that the calculation of the position of the center of sphere S in the photogrammetry process is more convenient.
It should be noted that although the center S, the first center a, the second center B and the third center C are marked with obvious solid points in fig. 1, it is easily understood by those skilled in the art that the solid points are only used for schematically indicating the positions of the center S, the first center a, the second center B and the third center in the figure so as to facilitate understanding of the specific aspects of the embodiments of the present invention. In an actual photogrammetric marking product, there may be no such solid dot structure.
Referring to fig. 2, in other embodiments of the present invention, a fourth reflector 40 (not shown in detail, but understood with reference to the first reflector 10, the second reflector 20 and/or the third reflector 30) may be further disposed on the body 1 of the photogrammetric mark. The fourth mirror 40 is also a reflective area as described above. That is, the aforementioned at least two reflection areas may further include the fourth mirror 40. The fourth mirror 40 may be circular and have a fourth center. The fourth center of the circle is a fourth distance away from the center S of the sphere. The fourth mirror 40 may be parallel to the second mirror 20 and perpendicular to the first mirror 10 and the third mirror 30, i.e. the plane of the fourth mirror 40 is parallel to the plane of the second mirror 20 and perpendicular to the plane of the first mirror 10 and the plane of the third mirror 30. And a fourth distance between the fourth circle center and the sphere center S of the spherical surface is equal to a first distance between the first circle center A and the sphere center S, a second distance between the second circle center B and the sphere center S, and a third distance between the third circle center C and the sphere center S.
It can be seen that in these embodiments, fourth mirror 40 and second mirror 20 are symmetrical about the center of sphere S.
In these embodiments, by further providing the fourth mirror 40 on the body 1, the range of the photographing position of one, two, or three of the four mirrors, which can photograph the photogrammetric mark in operation, is made larger, thereby facilitating the photogrammetric measurement using the photogrammetric mark without excessively adjusting the orientation of the photogrammetric mark during the photogrammetric measurement.
Referring to fig. 2 and 3, in other embodiments of the present invention, a fifth mirror 50 may be further disposed on the body 1 of the photogrammetric mark. (not shown in detail, as may be appreciated with reference to first mirror 10, second mirror 20, third mirror 30, and/or fourth mirror 40 as previously described). The fifth mirror 50 is also a reflective area as described above. That is, the aforementioned at least two reflection areas may further include the fifth mirror 50. The fifth mirror 50 may be circular and have a fifth center. The fifth circle center is a fifth distance away from the sphere center S of the spherical surface. The fifth mirror 50 may be parallel to the third mirror 30 and perpendicular to the first mirror 10, the second mirror 20 and the fourth mirror 40, that is, the plane of the fifth mirror 50 is parallel to the plane of the third mirror 30 and perpendicular to the plane of the first mirror 10, the plane of the second mirror 20 and the plane of the fourth mirror 40. Moreover, a fifth distance between the fifth circle center and the sphere center S of the spherical surface is equal to a first distance between the first circle center a and the sphere center S, a second distance between the second circle center B and the sphere center S, a third distance between the third circle center C and the sphere center S, and a fourth distance between the fourth circle center and the sphere center S.
In these embodiments, it can be seen that the fifth mirror 50 and the third mirror 30 are symmetrical about the center of the sphere S.
In these embodiments, by further providing the fifth mirror 50 on the body 1, one, two or three of the five mirrors of the photogrammetric mark can be photographed at any position within 360 degrees around the photogrammetric mark except for the direction away from the first mirror 10 (which is generally the attaching direction of the photogrammetric mark, i.e. attached to the device under test through one side of the direction) in operation, thereby facilitating photogrammetric measurements using the photogrammetric mark without requiring adjustment of the orientation of the photogrammetric mark during the photogrammetric measurements.
In some embodiments of the present invention, the aforementioned fourth reflector 40 and/or the fifth reflector 50 may also be respectively provided with an identification mark, and the identification mark may be the same as the identification mark on the first reflector 10, the second reflector 20, and the third reflector 30, and is a black metal ring.
In some embodiments, fourth mirror 40 and fifth mirror 50 may have the same diameter as first mirror 10, second mirror 20, and third mirror 30 described above, which may facilitate the calculation of the position of center of sphere S during photogrammetry.
In some embodiments of the present invention, the first reflector 10, the second reflector 20, the third reflector 30, the fourth reflector 40 and/or the fifth reflector 50 may be respectively protruded on the corresponding support planes 11, 21, 31, 41 and 51 of the body 1 (refer to fig. 1 to 3). In other embodiments, the first reflector 10, the second reflector 20, the third reflector 30, the fourth reflector 40 and/or the fifth reflector 50 may also be directly formed on the body 1 without protruding (not shown).
The embodiment of the utility model provides a photogrammetry target for the photogrammetry camera is when different station position formation of image, in great within range, can all carry out the precision measurement to the photogrammetry mark at 360 within ranges even, need not artifical rotatory photogrammetry mark, has improved efficiency greatly.
Example 2
On the basis of embodiment 1, this embodiment provides another photogrammetric target, as shown in fig. 4 and fig. 5, which includes a main body 1 and five reflective areas disposed on the main body 1, wherein the positional relationship of the five reflective areas is the same as that of embodiment 1, and the description thereof is omitted here. As shown in FIG. 4, the main body 1 of this embodiment is a sphere made of stainless steel 3Cr13 or 2Cr13, the hardness of which requires HRC40, the form and position accuracy of the main body 1 requires 0.004mm, and the smoothness of which requires 0.025 μm. In order to ensure the measurement interchangeability, the sphere diameter of the body 1 is consistent with that of a 1.5-inch reflector of the laser tracker, the sphere diameter is 38.1 +/-0.003 mm, and the symmetry to the sphere center is 0.004 mm; the diameter of the supporting plane 11 is 27.85mm, two adjacent supporting planes are perpendicular to each other, the verticality is 0.004mm, the flatness of the supporting plane 11 is 0.003mm, the roughness is 0.025 mu m, the distance between the circle center of each supporting plane 11 and the sphere center is guaranteed to be accurate to 13mm +/-0.003 mm, and the connecting lines of the circle centers of two adjacent supporting planes 11 and the sphere center are perpendicular to each other, so that the coordinates of the sphere center can be obtained through the coordinates of the circle centers of at least three supporting planes.
In order to improve the reflection effect of the returned light, the present embodiment focuses on providing a reflector structure, as shown in fig. 4, the present embodiment takes the first reflector 10 as an example for description, the first reflector 10 is composed of a plurality of glass beads 102 with high refractive index closely arranged on a plane, the particle size of the glass beads 102 is 50 ± 5 μm, and the refractive index Nd is greater than or equal to 1.93. In order to further enhance reflection, a reflection enhancing layer 103 is further disposed on an inner layer of the first reflector 10, the reflection enhancing layer 103 is disposed on an outer surface of the body 1, a plurality of glass beads 102 are arranged on the outer surface of the reflection enhancing layer 103, and the reflection enhancing layer 103 is a silver-plated layer, so that a back light reflection effect of the first reflector 10 can be enhanced. The metal ring 101 is black, is obtained by blackening or vacuum plating a black film, has a thickness of 0.005mm, and requires +/-2 μm of roundness of the inner circle.
Further, a base layer, such as a reflective region corresponding to the first reflector 10, is disposed on each supporting plane of the body 1, a base layer 104 is disposed on the supporting plane 11, and an outer surface of the base layer 104 forms a supporting surface for supporting the reflection enhancing layer 103. Specifically, the base layer 104 is a glass sheet, and in order to fix the glass sheet on the corresponding support plane 11, 8 tapered glue injection holes 105 are formed in the support plane 11 for injecting glue and then adhering the glass sheet tightly. The base layer 104, the reflection enhancement layer 103 and the glass beads 102 of this embodiment are integrally made of a light-reflecting silvered glass sheet.
The optical glass sheet selected for the base layer 104 is a trapezoidal truncated cone-shaped sheet, the thickness of the sheet is 3 +/-0.002 mm, the upper portion and the lower portion of the sheet are provided with two circular sections with different sizes, the diameter of a large circle is 25mm, the diameter of a small circle is 24mm, and the surface of the small circle is plated with silver to form the reflection enhancement layer 103. In order to facilitate glue injection, the diameter of the great circle of the optical glass sheet 210 is smaller than that of the support plane 11 on the body 1, and the material of the optical glass sheet is K9. The diameter of the inner circle of the metal ring 101 is equal to the diameter of the small circle of the base layer 104. The center of the base layer 104, the metal ring 101 or the first reflector 10 and the center of the sphere of the body 1 are on the same straight line, and the position precision requirement reaches +/-0.003 mm.
In this embodiment, the structures of each reflective region are the same, and the structures of the remaining mirrors are the same as those of the first mirror 10, which is not described herein again.
The utility model has the advantages that: the precision of the photogrammetric target is far superior to that of the traditional single-side light return reflection patch type target, the target has a strong light return emission effect, a high-contrast mark image can be obtained through low-intensity exposure, and the method is particularly suitable for the field of high-precision photogrammetric measurement. In addition, the target with the multi-reflex reflector enables the photogrammetric camera to accurately measure the photogrammetric target in a larger range or even in a 360-degree range when the photogrammetric camera images at different stations, the photogrammetric target does not need to be rotated manually, and the efficiency is greatly improved.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (8)
1. A high-precision return-light reflection photogrammetric target is characterized by comprising,
a body, at least a portion of an outer surface of the body being a spherical surface, the spherical surface having a spherical center;
at least two reflecting regions formed on the body, wherein the at least two reflecting regions have a predetermined spatial position relationship with the center of sphere, so that when the photogrammetric target is placed in a space, the position of the center of sphere in the space can be obtained through calculation according to the positions of the at least two reflecting regions in the space and the predetermined spatial position relationship;
the reflecting area is an area which is arranged on the outer surface of the body and is provided with a reflecting mirror and an identification mark;
the reflecting mirror is formed by closely arranging a plurality of glass beads on a plane, and the identification mark is an area with a certain shape and color arranged on the surface of the reflecting mirror;
the reflection enhancement layer is arranged on the outer surface of the body, and the glass beads are arranged on the outer surface of the reflection enhancement layer.
2. The measurement target of claim 1, further comprising a base layer disposed on an outer surface of the body, the outer surface forming a support surface for supporting the reflection enhancing layer.
3. The measurement target of claim 1, wherein the reflector is circular and the identification mark is a black ring disposed on an outer surface of the reflector.
4. The measurement target of claim 2, wherein the base layer is a trapezoidal glass truncated cone and the reflection enhancing layer is a silver plated layer disposed on an outer surface of the base layer.
5. The measurement target according to claim 1, wherein the spatial positional relationship is a distance between the reflection region and a center of a sphere, an angle made by a line connecting the center of the sphere and a specific point on the reflection region and the reflection region, and a distance between the center of the sphere and the specific point on the reflection region.
6. The measurement target of claim 1, wherein the mirrors of each reflection area are circular, and the distance between the center of each mirror and the center of the sphere is equal.
7. The measurement target of claim 6, wherein a line connecting the center of each mirror and the center of the sphere is perpendicular to each other.
8. The measurement target of claim 1, comprising five reflection areas, wherein the reflectors of the five reflection areas are all circular, the distances between the centers of the five reflectors and the connecting line between the centers of the spheres are all equal, and the distances between the centers of two adjacent reflectors and the connecting line between the centers of the spheres are perpendicular to each other.
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| CN201921315619.6U CN210426541U (en) | 2019-08-14 | 2019-08-14 | High-precision return light reflection photogrammetric target |
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| CN201921315619.6U CN210426541U (en) | 2019-08-14 | 2019-08-14 | High-precision return light reflection photogrammetric target |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3907467A1 (en) * | 2020-05-05 | 2021-11-10 | Rohr, Inc. | Multi-directional photogrammetry target |
| US12025440B2 (en) | 2021-05-04 | 2024-07-02 | Rohr, Inc. | Multi-directional photogrammetry target |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3907467A1 (en) * | 2020-05-05 | 2021-11-10 | Rohr, Inc. | Multi-directional photogrammetry target |
| US12025440B2 (en) | 2021-05-04 | 2024-07-02 | Rohr, Inc. | Multi-directional photogrammetry target |
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