Lateral camera position image recognition reflective mark and detection system

Abstract

The invention discloses a lateral camera position image recognition reflective mark and a detection system, and relates to the technical field of intelligent monitoring, the lateral camera position image recognition reflective mark comprises a mounting seat and a plurality of reflective parts, the mounting seat extends in a first direction, and the first side of the mounting seat is used for being mounted on the side of a steel rail; the multiple light reflecting parts are arranged on the second side of the mounting base at intervals in the first direction, each light reflecting part is provided with a light reflecting face facing the image collecting device, the image collecting device is arranged facing the light reflecting faces, and an included angle is formed between the image collecting device and the steel rail. According to the lateral camera position image recognition reflective mark, the lateral camera position image recognition reflective mark and the image collecting device are connected into a piece from the view angle right opposite to the image collecting device, it is guaranteed that the lateral camera position image recognition reflective mark has enough size, accurate recognition of the image collecting device on a measuring point at a lateral camera position is achieved, and the lateral camera position image recognition reflective mark is simple in structure, convenient to maintain and install and capable of achieving lateral image recognition.

Description

Technical Field

[0001] The present invention relates to the field of intelligent monitoring technology, and in particular to a side camera image recognition reflective mark and detection system. Background Art

[0002] With the continuous development of image recognition technology, track displacement intelligent monitoring technology based on image recognition has begun to be applied to the displacement recognition of rail expansion adjusters and track lines of large-span bridges. Track image recognition methods are divided into frontal recognition and lateral recognition. Because the track is a linear structure, track monitoring cameras are usually installed laterally to expand the recognition field of view and improve monitoring efficiency.

[0003] In order to accurately identify the position change of the track through the camera, it is necessary to install image recognition targets at the track measurement point. Commonly used targets in the field of image recognition include QR code targets, prism targets, reflective sticker targets, laser targets, etc. In addition, due to the need for vehicles to pass through the track, the track structure places high demands on the volume and installation plan of the measurement point targets. Summarizing the characteristics of existing image recognition targets, there are still the following problems: the recognition distance of the QR code target is relatively short, generally only 5m, which is not suitable for longer-distance track displacement recognition; the prism target is relatively large in size, and there are great safety hazards when installed on the track; although the reflective sticker target has a relatively long recognition distance and is light and easy to install, it is only suitable for camera front recognition, not for camera side recognition; the laser recognition target has a high cost, which is not conducive to long-term maintenance, and is generally used in tunnel recognition environments with low visibility. Summary of the invention

[0004] The main purpose of the present invention is to propose a side camera image recognition reflective marker and detection system, aiming to provide a side camera image recognition reflective marker that has a simple structure, is easy to maintain and install, and can realize side image recognition.

[0005] To achieve the above-mentioned purpose, the side camera image recognition reflective marker proposed by the present invention is used for installation on rails, and the side camera image recognition reflective marker comprises:

[0006] A mounting seat is extended along a first direction, the mounting seat has a first side and a second side which are opposite to each other, the first side of the mounting seat is used to be mounted on a side of a rail; and

[0007] A plurality of reflective portions are arranged at intervals on the second side of the mounting seat along the first direction, each of the reflective portions having a reflective surface facing the image acquisition device, and an angle between the reflective surface and the mounting seat is acute.

[0008] In one embodiment, the angle is A, wherein 10°≤A≤80°.

[0009] In one embodiment, 30°≤A≤40°.

[0010] In one embodiment, the reflective portion comprises a microcrystalline reflective sticker; and / or,

[0011] The reflective portion is bonded to the mounting seat.

[0012] In one embodiment, the mounting seat includes a mounting portion extending along the first direction, a second side of the mounting portion is protrudingly provided with a plurality of mounting protrusions, each of the mounting protrusions has a mounting surface for facing the image acquisition device, and the angle between the mounting surface and the mounting seat is set at an acute angle;

[0013] Each of the reflective portions is arranged on the corresponding mounting surface, and a side of each of the reflective portions facing away from the mounting surface forms the reflective surface.

[0014] In one embodiment, the mounting portion and the mounting protrusion are integrally arranged; and / or,

[0015] The material of the mounting seat includes synthetic fiber material.

[0016] In one embodiment, each of the reflective portions is rotatably mounted on the mounting seat along an axis extending along the second direction, so that the size of the included angle is adjustable; and / or,

[0017] Each of the reflective parts is detachably mounted on the mounting seat.

[0018] The present invention further provides a detection system, the detection system comprising an image acquisition device and a side camera image recognition reflective mark, the side camera image recognition reflective mark comprising:

[0019] A mounting seat is extended along a first direction, the mounting seat has a first side and a second side which are opposite to each other, the first side of the mounting seat is used to be mounted on a side of a rail; and

[0020] A plurality of reflective portions are arranged at intervals on the second side of the mounting seat along the first direction, each of the reflective portions having a reflective surface facing the image acquisition device, and an angle between the reflective surface and the mounting seat is acute.

[0021] In one embodiment, the side camera image recognition reflective marker is provided in plurality, and the plurality of side camera image recognition reflective markers are spaced along the first direction for installation on the side of the rail;

[0022] The image acquisition device is used to be arranged on one side of the rail and is arranged towards the multiple reflective surfaces.

[0023] In one embodiment, a bonding layer is provided on a side of the mounting seat facing the rail.

[0024] In the technical solution of the present invention, the mounting seat is installed on the side of the rail, and a plurality of reflective parts are arranged on the side of the mounting seat away from the rail. The angle between the reflective surface of each reflective part and the mounting seat is acute, and the reflective surface is inclined toward the front or rear of the rail. The image acquisition device is arranged toward the reflective surface to form an angle with the rail. Compared with the detection method of the front and side positions, the recognition scene can be expanded and the detection efficiency can be improved. In addition, the reflective surface is inclined to form a piece at the viewing angle facing the image acquisition device, which ensures that the side camera image recognition reflective mark has a sufficient size to meet the image acquisition device's accurate recognition of the measuring point at the side camera position, and provides a side camera image recognition reflective mark with a simple structure, convenient maintenance and installation, and capable of realizing side image recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of an embodiment of a side camera image recognition reflective marker provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the installation of the reflective markers for image recognition in the middle and side camera positions on the rails;

[0028] Figure 3 for Figure 1 Schematic diagram of the image recognition reflective mark and image acquisition device in the middle and side camera positions;

[0029] Figure 4 This is a schematic structural diagram of an embodiment of a detection system provided by the present invention.

[0030] Description of Figure Numbers:

[0031] 100. side camera image recognition reflective mark; 1. mounting seat; 11. mounting portion; 12. mounting convex portion; 2. reflective portion; 21. reflective surface;

[0032] 200. Image acquisition device;

[0033] 300. Detection system;

[0034] 400. Rails.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The characteristics of existing image recognition targets still have the following problems: the recognition distance of QR code targets is relatively short, generally only 5m, and is not suitable for longer-distance track displacement recognition; prism targets are relatively large in size, and there are great safety hazards when installed on the track; although reflective sticker targets have a relatively long recognition distance and are light and easy to install, they are only suitable for camera front recognition and not for camera side recognition; laser recognition targets are expensive and not conducive to long-term maintenance, and are generally used in tunnel recognition environments with low visibility.

[0040] The present invention proposes a side camera image recognition reflective marker, aiming to provide a side camera image recognition reflective marker with a simple structure, convenient maintenance and installation, and capable of realizing side image recognition.

[0041] See also Figures 1 to 4 In one embodiment of the present invention, the side camera image recognition reflective marker 100 is used to be installed on the rail 400. The side camera image recognition reflective marker 100 includes a mounting seat 1 and a plurality of reflective portions 2. The mounting seat 1 is extended along a first direction. The mounting seat 1 has a first side and a second side that are opposite to each other. The first side of the mounting seat 1 is used to be installed on the side of the rail 400. The plurality of reflective portions 2 are arranged at intervals along the first direction on the second side of the mounting seat 1. Each of the reflective portions 2 has a reflective surface 21 facing the image acquisition device 200. The angle between the reflective surface 21 and the mounting seat 1 is an acute angle.

[0042] It should be noted that, since the image acquisition device 200 needs to use the side camera image recognition reflective marker as an identification marker, the side camera image recognition reflective marker 100 needs to cooperate with the camera position of the image acquisition device 200 to reflect light as a marker, and its role in the detection process is crucial.

[0043] It can be understood that the mounting seat 1 can be an independent component that is integrally arranged, or it can be a whole formed by assembling multiple components. The mounting seat 1 as a whole extends roughly along the first direction, that is, the mounting seat 1 is arranged in a strip shape to match the extension direction of the rail.

[0044] The first side of the mounting seat 1 is arranged toward the rail, and the second side of the mounting seat 1 is arranged away from the rail. In order to cooperate with the monitoring of the image acquisition device 200, the reflective portion 2 is arranged on the side of the mounting seat 1 away from the rail and toward the image acquisition device 200.

[0045] A plurality of the reflective stickers are connected together to ensure that the side camera image recognition reflective label 100 has a sufficient size, can realize long-distance image recognition, can realize the accurate positioning of the measuring point target when the image acquisition device 200 acquires the side camera image, and ensures that the image acquisition device 200 can make the center line of the field of view and the reflective surface 21 perpendicular to each other at any required angle.

[0046] It should be noted that the reflective portion 2 can be a component with reflective properties as a whole, or a component with reflective properties in a partial area. The reflective surface 21 refers to a surface with certain refractive and reflective properties so that it can produce a reflective effect under the irradiation of light.

[0047] In the technical solution of the present invention, the mounting seat 1 is installed on the side of the rail 400, and a plurality of reflective parts 2 are arranged on the side of the mounting seat 1 away from the rail 400. The angle between the reflective surface 21 of each reflective part 2 and the mounting seat 1 is acute, and the reflective surface 21 is inclined toward the front or rear of the rail 400. The image acquisition device 200 is arranged toward and perpendicular to the reflective surface 21, and forms an angle with the rail 400. Compared with the detection method of the front and side positions, the recognition scene can be expanded and the detection efficiency can be improved. In addition, the reflective surface 21 is inclined and connected into one piece at the viewing angle facing the image acquisition device 200, which ensures that the side camera image recognition reflective mark 100 has a sufficient size to meet the image acquisition device 200's accurate recognition of the measuring point at the side camera position, and provides a side camera image recognition reflective mark 100 with a simple structure, convenient maintenance and installation, and capable of realizing side image recognition.

[0048] In the embodiments of the present invention, please refer to Figure 3 , the size of the angle is A, wherein 10°≤A≤80°. The angle is set within the range of 10° to 80°, the image acquisition device 200 faces the reflective surface 21, and the angle between the center line of the field of view of the image acquisition device 200 and the extension direction of the rail 400 can be set within the range of 80° to 10° for detection.

[0049] It can be understood that the smaller the angle between the center line of the field of view of the camera position of the image acquisition device 200 and the extension direction of the road track, the larger the recognition field of view of the image acquisition device 200. Conversely, the larger the angle between the center line of the field of view of the camera position of the image acquisition device 200 and the extension direction of the road track, the smaller the recognition field of view of the image acquisition device 200.

[0050] It can be understood that when the angle between the center line of the field of view of the image acquisition device 200 and the extension direction of the rail is too small, the reflective portion 2 located on the front side of the two adjacent reflective portions 2 will block the reflective portion 2 located on the rear side more, and the image acquisition effect will not be ideal. Therefore, the larger the recognition field of view of the image acquisition device 200, the better.

[0051] When the angle between the center line of the field of view of the image acquisition device 200 and the extension direction of the rail is too large, close to 90°, the recognition field of view of the image acquisition device 200 is small.

[0052] Preferably, 30°≤A≤40°. By setting the size of the included angle within this range, the image acquisition device 200 can fully monitor the images fed back by each of the reflective parts 2 under an appropriate field of view.

[0053] Specifically, in an embodiment of the present invention, the reflective portion 2 includes a microcrystalline reflective sticker, which ensures that the image acquisition device 200 can also perform accurate image recognition under conditions of low visibility at night and in rainy and snowy days. It should be noted that "microcrystal" generally refers to a specific structure, and microcrystal refers to a crystal structure with very small grains. This structure of tiny grains can form a special texture or morphology on the surface of the material, with some unique properties and characteristics. In reflective stickers or other applications, materials with microcrystalline structures usually have certain refractive and reflective properties, so that they can produce a reflective effect when exposed to light. This microcrystalline structure can achieve specific optical properties by controlling the size, shape and arrangement of the grains, thereby achieving the purpose of enhancing the reflective effect.

[0054] Of course, the reflective portion 2 is not limited to the above-mentioned microcrystalline reflective tape, but can also be a glass bead reflective tape. The characteristic of the glass bead reflective tape is that its surface is covered with many tiny glass beads, which can effectively reflect light and produce a bright reflective effect. The working principle of the glass bead reflective tape is to use these tiny glass beads to produce holographic scattering under the irradiation of light, so that the light is reflected back to the original light source direction.

[0055] Preferably, the reflective portion 2 is configured as a microcrystalline reflective sticker, so that it performs better when the light is dim or when observed from a long distance, and can provide a brighter and more eye-catching reflective effect.

[0056] Of course, the reflective portion 2 can also be set as a polymer reflective sticker, a diamond-grade reflective sticker, a metal reflective sticker or a fluorescent reflective sticker, etc. Of course, other possible materials or structures can also be used. The specific ones can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0057] In the embodiments of the present invention, please refer to Figure 1 The mounting seat 1 includes a mounting portion 11 extending along the first direction, and a plurality of mounting protrusions 12 are protrudingly provided on a second side of the mounting portion 11, each of the mounting protrusions 12 has a mounting surface facing the image acquisition device 200, and the angle between the mounting surface and the mounting seat 1 is an acute angle; each of the reflecting portions 2 is provided on the corresponding mounting surface, and the side of each of the reflecting portions 2 facing away from the mounting surface forms the reflecting surface 21.

[0058] It can be understood that the mounting portion 11 and the mounting protrusion 12 can be integrally arranged or assembled, and the specific design can be based on actual conditions, which is not limited in the embodiments of this specification.

[0059] In this way, it is only necessary to adjust the shape of the mounting protrusion 12 so that the angle between the mounting surface of the mounting seat 1 and the mounting seat 1 is set to be an acute angle, without adjusting the shape of the reflective portion 2. When the reflective portion 2 is set as a reflective sticker, it is only necessary to directly install the reflective portion 2 on the mounting surface, so that the angle between the reflective surface 21 of the reflective portion 2 and the mounting seat 1 can be set to be an acute angle.

[0060] It is understandable that the mounting protrusion 12 can be set in the shape of a triangular prism, one of the three side surfaces of the triangular prism faces the mounting portion 11, and one of the other two side surfaces forms the mounting surface. The mounting protrusion 12 is not limited to being set in the shape of a triangular prism, but can be a polygonal prism, one of the side surfaces of which forms the mounting surface.

[0061] In another embodiment, the mounting base 1 includes a mounting portion 11 extending along the first direction, and the reflecting portion 2 can be set as a triangular prism, one side of the reflecting portion 2 is connected to the mounting base 1, and one of the other two side surfaces of the triangular prism is formed with the reflecting surface 21.

[0062] In the embodiment of the present invention, the reflective portion 2 is bonded to the mounting seat 1. The reflective portion 2 is bonded to the mounting surface of the mounting seat 1 by direct bonding, and the assembly form and structure are simple.

[0063] In an embodiment of the present invention, the mounting portion 11 and the mounting protrusion 12 are integrally arranged; and / or, the material of the mounting seat 1 includes synthetic fiber material. In this way, the mounting seat 1 can be directly formed quickly by injection molding, extrusion or hot pressing. Of course, in addition to being made of synthetic fiber material, the material of the mounting seat 1 can also be made of plastic materials such as polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), etc., which can also make the mounting seat 1 small in size, light in weight, easy to install, suitable for the conditions of the rail 400 measurement point, and can ensure the operation safety of the rail 400.

[0064] Furthermore, in another embodiment, each of the reflective portions 2 is rotatably mounted on the mounting base 1 along an axis extending in the second direction, so that the size of the angle is adjustable; thus, when the image acquisition device 200 is in different positions, the orientation of each of the reflective surfaces 21 can be adjusted to adapt to the image acquisition device 200. Each of the reflective surfaces 21 that can be adjusted in angle ensures that the center line of the field of view of the image acquisition device 200 can be perpendicular to the reflective surface 21 at any desired angle.

[0065] In other embodiments, when the mounting seat 1 includes the mounting portion 11 and a plurality of mounting protrusions 12, and the reflective portion 2 is bonded to the mounting protrusions 12, each of the mounting protrusions 12 can be configured to be rotatably mounted on the mounting portion 11 along an axis extending along the second direction, so as to make the size of the angle of the reflective surface 21 of the reflective portion 2 adjustable.

[0066] In another embodiment, each of the reflective parts 2 is detachably mounted on the mounting base 1. In this way, the number of the reflective parts 2 can be set according to actual needs to ensure that the side camera image recognition reflective mark 100 has a sufficient size to achieve long-distance image recognition.

[0067] The present invention also provides a detection system 300, see Figure 3 to Figure 4 The detection system 300 includes an image acquisition device 200 and a side camera image recognition reflective mark 100. The specific structure of the side camera image recognition reflective mark 100 refers to the above embodiment. Since the detection system 300 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0068] It should be noted that the image acquisition device 200 generally refers to a component or device used to capture an image and convert it into a digital signal, generally a camera or a webcam.

[0069] In the present invention, the linear displacement monitoring of the rail 400 by the side camera image recognition reflective marker 100 and the image acquisition device 200 can be divided into the following steps:

[0070] Image acquisition: First, an image acquisition device 200 (such as a camera) is used to acquire images of the rail 400. These images can capture the features and details of the track alignment.

[0071] Side camera image recognition reflective marker 100: A side camera image recognition reflective marker is placed next to the rail 400 to make it easy to identify and locate in the image.

[0072] Image processing: The acquired image is processed by an image processing algorithm, and the side camera image recognition reflective markers in the image are identified through computer vision technology to locate their position and shape in the image.

[0073] Displacement identification: By comparing the position changes of reflective markers in different image frames in the side camera image identification, the displacement of the track line can be calculated. By analyzing the size and direction of the displacement, it can be determined whether the track line has shifted or displaced.

[0074] Alarm and adjustment: If the system detects that the displacement of the track line exceeds the preset threshold, the system can issue an alarm and notify relevant personnel to make adjustments and corrections to ensure the safety and stability of the rail 400.

[0075] Specifically, in an embodiment of the present invention, a plurality of the side camera image recognition reflective markers 100 are provided, and the plurality of the side camera image recognition reflective markers 100 are spaced apart along the first direction for installation on the side of the rail 400 ; the image acquisition device 200 is provided on one side of the rail 400 and is disposed toward the plurality of the reflective surfaces 21 .

[0076] In this way, a relatively complete detection system 300 is constructed, and the image acquisition device 200 can collect image information from multiple side camera image recognition reflective markers 100, and can determine the displacement of the corresponding rail at each side camera image recognition reflective marker 100.

[0077] The side camera image recognition reflective marker 100 is installed at the track measuring point through the mounting base 1, and different sticking methods can be used according to different measuring point conditions.

[0078] In an embodiment of the present invention, a bonding layer is provided on the side of the mounting seat 1 facing the rail 400. Specifically, the bonding layer is a reinforcing bar glue applied to one side of the mounting seat 1 to mount the mounting seat 1 on the waist of the rail.

[0079] Of course, the adhesive layer is not limited to the above-mentioned anchor glue, and can also be epoxy resin, silicone, etc. The specific design can be based on actual conditions, and the embodiments of this specification do not limit this.

[0080] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A side camera image recognition reflective marker, used for installation on rails, characterized in that: The side camera image recognition reflective mark includes: A mounting seat is extended along a first direction, the mounting seat has a first side and a second side which are opposite to each other, the first side of the mounting seat is used to be mounted on a side of a rail; and A plurality of reflective portions are arranged at intervals on the second side of the mounting seat along the first direction, each of the reflective portions having a reflective surface facing the image acquisition device, and an angle between the reflective surface and the mounting seat is acute.

2. The side camera image recognition reflective marker according to claim 1, characterized in that: The size of the angle is A, wherein 10°≤A≤80°.

3. The side camera image recognition reflective marker according to claim 2, characterized in that: 30°≤A≤40°。 4. The side camera image recognition reflective marker according to claim 1, characterized in that: The reflective portion includes a microcrystalline reflective sticker; and / or, The reflective portion is bonded to the mounting seat.

5. The side camera image recognition reflective marker according to claim 1, characterized in that: The mounting seat comprises a mounting portion extending along the first direction, a second side of the mounting portion is protrudingly provided with a plurality of mounting protrusions, each of the mounting protrusions has a mounting surface for facing the image acquisition device, and the angle between the mounting surface and the mounting seat is set at an acute angle; Each of the reflective portions is arranged on the corresponding mounting surface, and a side of each of the reflective portions facing away from the mounting surface forms the reflective surface.

6. The side camera image recognition reflective marker according to claim 5, characterized in that: The mounting portion and the mounting protrusion are integrally arranged; and / or, The material of the mounting seat includes synthetic fiber material.

7. The side camera image recognition reflective marker according to any one of claims 1 to 6, characterized in that: Each of the reflective portions is rotatably mounted on the mounting seat along an axis extending along the second direction, so that the size of the included angle is adjustable; and / or, Each of the reflective parts is detachably mounted on the mounting seat.

8. A detection system, characterized in that: It comprises an image acquisition device and a side camera image recognition reflective mark as described in any one of claims 1 to 7.

9. The detection system according to claim 8, characterized in that: The side camera image recognition reflective markers are provided in plurality, and the plurality of side camera image recognition reflective markers are spaced along the first direction for installation on the side of the rail; The image acquisition device is used to be arranged on one side of the rail and is arranged towards the multiple reflective surfaces.

10. The detection system according to claim 8, characterized in that: The mounting seat is provided with an adhesive layer on one side facing the rail.

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