Image measurement system based on laser projection device

Abstract

The invention provides an image measurement system based on a laser projection device, which belongs to the technical field of image measurement and is composed of the laser projection device, a camera and an image recognition system. The laser projection device is composed of a laser and a fixing support with an angle adjusting mechanism. The camera is an optical image acquisition device; the image recognition system is composed of an image reading module, an image recognition module and an image processing module. Compared with a mode of realizing camera shooting measurement through a multi-view camera, the cost is lower, and no special requirement on the number and the type of the camera exists; compared with a measurement mode of shooting the same target at multiple angles through a monocular camera to realize a stereoscopic view, the efficiency is higher, and compared with a shooting mode of combining the camera and a laser ranging module, the method does not need to pair data of the ranging module with an image shot by the camera, so that the measurement efficiency is improved. And the stable adjustment and time required by the measurement of the laser ranging module are not required, so that the efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of image measurement, and in particular to an image measurement system based on a laser projection device. Background Art

[0002] At present, the image-based method of identifying the size of objects in the image is mainly based on three key factors: lens focal length, shooting distance and image pixels. The specific implementation method is generally to measure the distance between the lens and the object, convert the image pixels to obtain the size of each pixel at the shooting distance, and then calculate the number of pixels occupied by the object to be measured to obtain the object size.

[0003] In actual use, since the distance measurement method in this type of method is mainly laser distance measurement, based on the characteristics of laser distance measurement, the biggest difficulty lies in measuring the accuracy and continuity of the distance between the shooting lens and the object being measured, as well as the correspondence between the measurement result and the object being measured. Especially in the field of low-altitude economy, image recognition is the most important industrial function of low-altitude economy, but most drones do not have laser distance measurement function. The process of establishing a correspondence between the external laser distance measurement module and the captured image is more cumbersome and inefficient.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an image measurement system with low cost, high efficiency and strong expansibility.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An image measurement system based on a laser projection device, which consists of a laser projection device, a camera, and an image recognition system;

[0008] The laser projection device is composed of a laser and a fixing bracket with an angle adjustment mechanism;

[0009] The camera is an optical image acquisition device;

[0010] The image recognition system is composed of image reading, recognition and processing functional modules.

[0011] Optionally, the laser in the laser projection device can project a point-shaped or line-shaped laser beam visible under sunlight.

[0012] Optionally, the fixed bracket with an angle adjustment mechanism in the laser projection device can adjust the projection angle of the laser beam.

[0013] Optionally, an image containing a laser beam projected in a shooting area is captured by a camera. The laser can be, but is not limited to, mounted on a camera device. It is only necessary to ensure that the laser beam projected by the laser is within the shooting range of the camera.

[0014] Optionally, by increasing the number of lasers in the system, equidistant point-shaped or polygonal laser projections are formed, and the geometric shape of the object is identified by the shape and spacing changes produced when the laser projection is projected onto the surface of the object.

[0015] Optionally, the camera includes but is not limited to an optical lens, a photosensitive element, an image processing system, and a power supply system.

[0016] Optionally, the image recognition system can automatically identify the laser beam projection in the image, and automatically calculate the actual size corresponding to each pixel in the image through preset laser beam size parameters. It can also perform the above calculation after manually selecting the laser beam projection in the image. According to the above calculation results, the AI ​​training model can be used to automatically identify the corresponding object size in the image, and the selected line segment length and region area can be automatically calculated by manually drawing lines and selecting areas.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Compared with the method of realizing video measurement through multiple cameras, the present invention has lower cost and has no special requirements on the number and type of cameras.

[0019] 2. Compared with the method of measuring by shooting the same target at multiple angles with a monocular camera to realize stereoscopic view, the present invention is more efficient. Only one picture needs to be taken for each measurement area, and continuous video recording can also be performed. In the later stage, only a single image needs to be captured to measure the object in the image, which greatly improves the efficiency.

[0020] 3. Compared with the camera + laser ranging module combined shooting method, the present invention does not need to pair the ranging module data with the image taken by the camera, nor does it need to wait for the stable adjustment and time required for the laser ranging module to measure, so it is more efficient.

[0021] 4. The main hardware of the present invention is a laser projection device 4, which has low cost and strong scalability. It can be deployed as an independent component on various existing cameras. With the help of processing software, the existing cameras can directly realize the function of measuring objects in the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 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 these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of the structure of a laser projection device of the present invention, in which 1 is a laser, 2 is a fixing bracket with an angle adjustment mechanism, 3 is a schematic diagram of the effect of the laser beam projected by the laser 1, and 4 is a laser projection device.

[0024] Figure 2 This is a schematic diagram of a typical combined use of a laser projection device and a camera of the present invention, wherein 5 is a camera.

[0025] Figure 3 6 is a schematic diagram of a laser projection device used in combination with a drone according to the present invention, wherein 6 is the combined drone.

[0026] Figure 4 This is a diagram showing an implementation of the present invention in which a laser projection device is installed on a drone to shoot images from a high altitude, and the image processing software automatically calculates the size of the marking position after manual marking.

[0027] Figure 5 This is a schematic diagram of the present invention for identifying the geometric shape of an object by using an equilateral triangle projected by a combination of multiple linear laser beams and the change in the projection shape caused on the surface of the geometric object. DETAILED DESCRIPTION

[0028] 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.

[0029] The purpose of the present invention is to provide an image measurement system with low cost, high efficiency and strong expansibility.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1:

[0032] This embodiment provides an image measurement system based on a laser projection device, such as Figure 1-2As shown, it is composed of a laser projection device, a camera, and an image recognition system;

[0033] The laser projection device is composed of a laser and a fixing bracket with an angle adjustment mechanism;

[0034] The camera is an optical image acquisition device;

[0035] The image recognition system is composed of image reading, recognition and processing functional modules.

[0036] In one embodiment, the laser in the laser projection device is capable of projecting a point-shaped or line-shaped laser beam visible under sunlight.

[0037] In one embodiment, the fixed bracket with an angle adjustment mechanism in the laser projection device can adjust the projection angle of the laser beam.

[0038] In one embodiment, an image containing a laser beam projected in a shooting area is captured by a camera. The laser can be, but is not limited to, mounted on a camera device. It only needs to ensure that the laser beam projected by the laser is within the shooting range of the camera.

[0039] In one embodiment, by increasing the number of lasers in the system, equidistant point-shaped or polygonal laser projections are formed, and the geometric shape of the object is identified by the shape and spacing changes produced when the laser projection is projected onto the surface of the object.

[0040] In one embodiment, the camera includes but is not limited to an optical lens, a photosensitive element, an image processing system, and a power supply system.

[0041] In one embodiment, the image recognition system can automatically identify the laser beam projection in the image, and automatically calculate the actual size corresponding to each pixel in the image through preset laser beam size parameters. It can also perform the above calculation after manually selecting the laser beam projection in the image. According to the above calculation results, the AI ​​training model can be used to automatically identify the corresponding object size in the image, and the selected line segment length and region area can be automatically calculated by manually drawing lines and selecting areas.

[0042] Embodiment 2:

[0043] like Figure 4 As shown, the image measurement system shown in this embodiment includes a camera 5, a laser projection device 4 and processing software. Figure 4Two sets of laser projection devices 4 are installed in parallel on the aircraft 5 with a spacing of 30 cm, and projected on the 30*60 cm floor tiles from a height of 30 meters, forming two laser spots 3 with a spacing of 30 cm as the size reference object. The image with the proportional reference spot 3 is captured by the automatic camera 5 on the aircraft 6. The image is imported into the processing software. The processing software is trained by the AI ​​algorithm and can automatically identify the position of the laser spot 3 in the image. In addition, the laser beam 3 point position in the image can also be manually selected. The processing software automatically calculates the distance represented by each pixel in the picture according to the number of pixels occupied by the distance between the center points of the two laser spots 3 (30 cm in this embodiment). Subsequently, the length, area, volume and other data of the selected area can be automatically calculated by the software according to the number of pixels in the selected area by drawing a line or selecting an area in the image.

[0044] Embodiment 3:

[0045] Based on the principles of the above embodiments, this embodiment discloses a method for performing image recognition on the three-dimensional structure of an object by forming a polygonal image on the surface of the object through equidistant projection of multiple laser beams.

[0046] like Figure 5 As shown in the example, three parallel-projected linear laser beams 3 form an equilateral triangle projection. When projecting the polygonal object surface, the laser projection will be deformed according to the change of the object surface shape. For example, the equilateral triangle laser projection on the concave object will shrink, while the equilateral triangle laser projection on the convex object will expand. By changing the shape and proportion of the laser projection, the geometric shape of the object surface can be identified in the captured plane image.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0048] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An image measurement system based on a laser projection device, characterized in that: It consists of a laser projection device, a camera, and an image recognition system; The laser projection device is composed of a laser and a fixing bracket with an angle adjustment mechanism; The camera is an optical image acquisition device; The image recognition system is composed of image reading, recognition and processing functional modules.

2. The image measurement system based on the laser projection device according to claim 1, characterized in that: The laser in the laser projection device can project a point-shaped or line-shaped laser beam visible under sunlight.

3. The image measurement system based on the laser projection device according to claim 1, characterized in that: The fixed bracket with an angle adjustment mechanism in the laser projection device can adjust the projection angle of the laser beam of the laser.

4. The image measurement system based on the laser projection device according to claim 1, characterized in that: The image containing the laser beam projected in the shooting area is captured by the camera. The laser can be but is not limited to being installed on the camera device. It only needs to ensure that the laser beam projected by the laser is within the shooting range of the camera.

5. The image measurement system based on the laser projection device according to claim 1, characterized in that: By increasing the number of lasers in the system, equidistant point or polygonal laser projections are formed. The geometric shape of the object is identified by the changes in shape and spacing produced when the laser projection is projected onto the surface of the object.

6. The image measurement system based on the laser projection device according to claim 1, characterized in that: The camera includes but is not limited to an optical lens, a photosensitive element, an image processing system, and a power supply system.

7. The image measurement system based on the laser projection device according to claim 1, characterized in that: The image recognition system can automatically identify the laser beam projection in the image, and automatically calculate the actual size corresponding to each pixel in the image through preset laser beam size parameters. It can also realize the above calculation by manually selecting the laser beam projection in the image. According to the above calculation results, the AI ​​training model can be used to automatically identify the corresponding object size in the image, and the selected line segment length and region area can also be automatically calculated by manually drawing lines and selecting areas.

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