Rail train vehicle panoramic image detection system optimization method and optimization structure

Abstract

The invention relates to an optimization method and an optimization structure for a panoramic image detection system of a rail train vehicle, and the method comprises the steps: arranging a diffuse emission light-transmitting part on an output light path of a light source module of the image detection system, and carrying out the scattering of light source light outputted to a vehicle body by the light source module through the diffuse emission light-transmitting part, and an image acquisition module of the image detection system performs image acquisition on the scattered light beam area of the vehicle body. The system structurally comprises a light source module and an image acquisition module of the image detection system, a light source light path of the light source module is provided with a diffuse emission light-transmitting piece; an incident light beam of the light source module penetrates through the diffuse reflection light-transmitting part and generates a scattered light beam distributed on the vehicle body; an image acquisition area of the image acquisition module on the vehicle body and a scattered light beam area projected to the vehicle body by the light source module are mutually overlapped. The non-imaging illumination technology is adopted, the scattering effect is achieved at the light source output end, and the problem that the illumination light source is difficult to design due to the fact that the reflection characteristic difference of the vehicle surface is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rail train visual detection, and in particular to an optimization method and an optimization structure of a rail train vehicle panoramic image detection system. Background Art

[0002] After the daily operation, rail trains return to the depot and need to undergo detailed daily inspections to ensure that the vehicles are in the best condition and effectively avoid potential faults such as looseness, displacement, deformation and foreign matter intrusion that threaten the safe operation of the trains. However, the traditional manual inspection method is not only labor-intensive, but also inefficient and costly, and it is difficult to meet the needs of modern rail transit for efficient and precise maintenance. To address this problem, the existing technology introduces a 360-degree panoramic image detection system for train vehicles. The system cleverly combines image acquisition and image analysis technology to achieve all-round and automated inspections during the train return process, significantly improving inspection efficiency and effectively reducing maintenance costs. The 360-degree panoramic image detection system for train vehicles generally includes an image acquisition system, which is the core component of the detection system. It mainly includes a high-performance CCD camera and a carefully designed lighting source (such as an LED light source). In order to ensure accurate image analysis, high-quality lighting is essential.

[0003] like Figure 1 As shown in the figure, in the existing image detection system, the LED light source is output after being shaped and diffused by the lens, and the camera converges the image through the lens. Under normal circumstances, Figure 2As shown in the figure, when the body surface is a diffuse reflection surface, the light intensity received by the camera lens is messy and uniform, which can be considered to meet the design requirements and achieve the detection target. In other words, when the body surface is a diffuse reflection surface, the light distribution will be more uniform. At this time, the image captured by the CCD camera can generate a better image effect with high image quality, and the system can identify the appearance details on the train body. However, when the body surface is a high reflectivity surface, the main light intensity received by the camera lens is the total reflected light of the emitted light, and the camera imaging is an optical core image with a certain magnification, which cannot achieve the detection target. Since the reflective properties of the surfaces of trains of different models or styles generally differ significantly, there are great challenges in the design of lighting sources. For example, the bottom of the train, because most of the parts are coated with dark gray reflective paint, the projection range of the light source for image capture is extremely limited under the illumination of LED light sources, and most areas are in a state of insufficient lighting. The main reason is the difference in reflectivity of the reflective surface of the object. The light reflected by the local high-reflective surface of the vehicle may cover up the tiny details of the surface, and these details may be lost during imaging, resulting in a decrease in image quality. The high-reflective surface may reflect light, causing uneven lighting, affecting the overall brightness and clarity of the image. The high-reflective surface will reflect more light. When these reflected lights enter the camera, they may cause the imaging sensor to be overexposed, making the image too bright and details lost, especially in strong light environments. 360-degree panoramic images are usually stitched together from images taken by multiple cameras. Highly reflective surfaces may cause large differences in brightness and color between images captured by different cameras, increasing the difficulty of image processing algorithms in stitching, resulting in unnatural traces or errors at the stitching. High reflectivity may cover up or distort some important features of the train surface, such as cracks, rust and other defects, which is a challenge for detection systems that rely on image features for recognition and analysis. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art to a certain extent as much as possible, the present invention provides an optimization method and optimization structure of a rail train vehicle panoramic image detection system, which adopts non-imaging lighting technology to achieve a scattering effect at the output end of the light source, and solves the problem that the reflection characteristics of the vehicle surface vary greatly, which brings difficulties to the design of the lighting light source.

[0005] The present invention discloses an optimization method for a panoramic image detection system of a rail train vehicle. A diffuse emission light-transmitting component is arranged on the output light path of a light source module of the image detection system. The light source light output from the light source module to the vehicle body is scattered by the diffuse emission light-transmitting component. The image acquisition module of the image detection system performs image acquisition on the scattered light beam area of ​​the vehicle body.

[0006] According to a method for optimizing a panoramic image detection system for a rail train vehicle of the present invention, the transmittance of the diffuse reflection translucent component is detected by a detection instrument, so that the transmittance of the light source to the diffuse reflection translucent component is controlled at 90% or above.

[0007] According to a method for optimizing a panoramic image detection system for a rail train vehicle of the present invention, the stray angle of the diffuse emission light-transmitting component is determined according to the field of view angle and shooting range of the image acquisition module, so that the scattered light generated by the light source passing through the diffuse emission light-transmitting component is distributed on the vehicle body and falls into the image acquisition range of the image acquisition module.

[0008] The present invention provides an optimized structure of a panoramic image detection system for a rail vehicle, comprising a light source module and an image acquisition module of an image detection system;

[0009] A diffuse emission light-transmitting member is arranged on the light source light path of the light source module;

[0010] The incident light beam of the light source module passes through the diffuse reflection light-transmitting member and generates a scattered light beam distributed on the vehicle body;

[0011] The image acquisition area of ​​the vehicle body by the image acquisition module overlaps with the scattered light beam area projected to the vehicle body by the light source module.

[0012] According to an optimized structure of a rail train vehicle panoramic image detection system of the present invention, the transmittance of the diffuse reflection light-transmitting element is ≥90%.

[0013] An optimized structure of a panoramic image detection system for a railway train vehicle according to the present invention:

[0014] The light source module includes an LED light source;

[0015] The diffuse reflective light-transmitting member comprises a diffuse reflective sheet;

[0016] Wherein, the diffuse emission sheet is arranged at the light beam output end of the LED light source.

[0017] An optimized structure of a panoramic image detection system for a railway train vehicle according to the present invention:

[0018] The image acquisition module includes an imaging camera;

[0019] The shooting direction of the imaging camera and the irradiation direction of the LED light source form a certain angle with each other;

[0020] Wherein, the LED light source passes through the diffuse emission sheet

[0021] The scattered light beam generated later is distributed on the vehicle body and falls into the shooting area of ​​the imaging camera.

[0022] According to an optimized structure of a rail train vehicle panoramic image detection system of the present invention, the diffuse emission sheet is transmission-connected with a displacement mechanism, and the diffuse emission sheet is driven by the displacement mechanism to linearly displace on the light path of the LED light source.

[0023] According to an optimized structure of a panoramic image detection system for a rail train vehicle of the present invention, the number of the diffuse emission sheets is several, and the diameter, thickness, reflectivity, spectral range, Lambertian property, optical flatness or stray angle of each of the diffuse emission sheets are different from each other;

[0024] Each of the diffuse emission sheets can be replaceably arranged on the light beam output end of the LED light source.

[0025] According to an optimized structure of a panoramic image detection system for a rail vehicle train of the present invention, it also includes a rotating mechanism, wherein each of the diffuse emission sheets surrounds the rotating axis of the rotating mechanism and is circumferentially distributed on the periphery of the rotating mechanism and is respectively connected to the rotating mechanism;

[0026] The rotating mechanism drives each of the diffuse emitting sheets to rotate and drives each of the diffuse emitting sheets to move to the light beam output end of the LED light source in turn.

[0027] An optimization method and optimization structure of a panoramic image detection system for a rail train vehicle of the present invention arranges a diffuse emission light-transmitting component on the output light path of a light source module, and utilizes the diffuse reflection characteristics of the diffuse emission light-transmitting component to scatter the relatively concentrated incident light beam originally generated by the light source module, so that the light source module projects a dispersed scattered light beam to the surface of the train body, and the body surface of the train is easy to generate a diffuse reflection light beam to the outside, forming a diffuse reflection area. Since the image acquisition area of ​​the body by the image acquisition module overlaps with the scattered light beam area projected by the light source module to the body, the diffuse reflection area on the body surface will not produce a high reflectivity to the image acquisition module. After the image acquisition module performs image acquisition on the scattered light beam area of ​​the body, the image of the body can be more clearly acquired, thereby improving the imaging quality of the image detection system and effectively solving the problem that the design of the lighting source is difficult due to the large differences in reflection characteristics of the vehicle surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a working structure diagram of a panoramic image detection system in the prior art;

[0030] Figure 2 It is a working structure diagram of a panoramic image detection system in the prior art;

[0031] Figure 3 It is the overall structure schematic diagram and effect diagram of the present invention;

[0032] Figure 4 It is an optional structural schematic diagram of the present invention;

[0033] Figure 5 It is a schematic diagram of an optional structure of the present invention (side view);

[0034] Figure 6 Schematic diagram of an optional structure of the present invention (front view);

[0035] Figure 7 It is an optional structural schematic diagram of the present invention;

[0036] Figure 8 yes Figure 7 Schematic diagram of activities;

[0037] Fig. 9 It is a schematic diagram of an optional structure of the present invention.

[0038] Reference numerals:

[0039] 1. LED light source, 2. Diffuse emission sheet, 3. Imaging camera, 4. Displacement mechanism, 5. Rotation mechanism, 6. Beam expansion lens, 7. Flipping mechanism. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0041] Embodiment 1

[0042] like Figure 3As shown, a method for optimizing a panoramic image detection system for a rail train vehicle of the present embodiment is to additionally install a diffuse emission light-transmitting component on the output optical path of the light source module of the image detection system, scatter the light source light output from the light source module to the vehicle body through the diffuse emission light-transmitting component, and the image acquisition module of the image detection system performs image acquisition on the scattered light beam area of ​​the vehicle body. That is to say, in addition to the light source module and the image acquisition module of the image detection system, the panoramic image detection system for rail train vehicles also includes a diffuse emission light-transmitting component installed on the light source optical path of the light source module. Specifically, the diffuse emission light-transmitting component is a diffuse reflection sheet, and the incident light beam of the light source module passes through the diffuse reflection sheet and generates a scattered light beam distributed on the vehicle body. In addition, the image acquisition area of ​​the vehicle body by the image acquisition module overlaps with the scattered light beam area projected to the vehicle body by the light source module.

[0043] It can be understood that the optimization scheme of the panoramic image detection system for rail train vehicles in this embodiment is mainly to set a diffuse emission light-transmitting component on the output light path of the light source module, and use the diffuse reflection characteristics of the diffuse emission light-transmitting component to scatter the relatively concentrated incident light beam originally generated by the light source module, so that the light source module projects a dispersed scattered light beam to the surface of the train body, and the body surface of the train is easy to generate a diffuse reflection light beam to the outside, forming a diffuse reflection area. Since the image acquisition area of ​​the body by the image acquisition module overlaps with the scattered light beam area projected by the light source module to the body, the diffuse reflection area on the body surface will not produce a high reflectivity to the image acquisition module. After the image acquisition module performs image acquisition on the scattered light beam area of ​​the body, the image of the body can be captured more clearly, thereby improving the imaging quality of the image detection system and effectively solving the problem that the reflection characteristics of the vehicle surface vary greatly, which brings difficulties to the design of the lighting source. In the design of the light source output end of the panoramic image detection system of rail train vehicles, a diffuse reflector is installed between the light source and the body surface. This diffuse reflector has a highly scattered characteristic. Its main function is to break the direct light emitted by the light source and convert it into soft light scattered in multiple directions. This design can effectively reduce the intensity of direct light and avoid the formation of strong light spots and shadows on the body surface, so that the body surface becomes a more ideal diffuse reflection surface. When the light from the light source passes through the diffuse reflector, the light will scatter in multiple directions to form a uniformly distributed light field. This light field is characterized by a messy and uniform light intensity distribution, which avoids the local overbrightness or overdarkness caused by traditional light sources. In this case, the light received by the camera lens comes from all directions of the body surface, rather than a single direction. Such a light distribution is conducive to the camera detecting the target. In this way, the panoramic image detection system of rail train vehicles can have the following obvious beneficial effects. The first beneficial effect is that the imaging quality can be improved. Due to the scattering effect of light, the light received by the camera lens is more uniform, which helps to eliminate image noise and artifacts caused by uneven light. This enables the camera to better capture the details of the body surface, thereby achieving clearer imaging. The second beneficial effect is that it can enhance the detection capability. In a uniform light field, the camera can detect the surface of the vehicle body more accurately. Since the light is evenly distributed in all directions, the camera can more easily identify the characteristics of the vehicle surface, such as color, shape and texture, thereby detecting the target with greater accuracy. The third beneficial effect is that it can adapt to a variety of environments. The design of the diffuse reflector makes the scattering effect of the light source more stable. Even in different lighting environments, the camera can still maintain good imaging effects, which provides great flexibility for the application of the camera in different scenarios.The fourth beneficial effect is that it can reduce cost and complexity. By adding a diffuse reflector, we can simplify the optical design of the camera system and reduce the overall cost. In addition, this design reduces the hardware connection between the light source and the camera, reduces the complexity of the system, and especially effectively solves the problem that the reflection characteristics of the vehicle surface vary greatly, which makes the design of the lighting source difficult.

[0044] By adding a diffuse reflection sheet to the output end of the light source in the technical solution, the scattering effect of the light source output is actively increased, which not only makes it easier for the body surface to form a diffuse reflection surface, but also makes the light intensity received by the camera lens messy and uniform, thereby meeting the design requirements and enabling the camera to better achieve the detection target and more easily form clear images. This improvement provides a new solution direction for the 360-degree panoramic image detection system of rail train vehicles.

[0045] In this embodiment, the following method steps need to be performed: the transmittance of the diffuse reflector is detected by a detection instrument, and the transmittance of the light source light to the diffuse reflector is controlled to be 90% or above. In terms of structure, the diffuse reflective light-transmitting element includes a diffuse reflective light-transmitting element, and the transmittance of the diffuse reflective light-transmitting element is ≥ 90%. In other words, when the diffuse reflective light-transmitting element receives the light from the light source, at least 90% of the light can pass through the light-transmitting element, thereby ensuring efficient use and uniform distribution of light.

[0046] In this embodiment, the following method steps need to be performed: determine the stray angle of the diffuse emission light-transmitting member according to the field of view angle and shooting range of the image acquisition module, and allow the scattered light generated by the light source passing through the diffuse emission light-transmitting member to be distributed on the vehicle body and fall into the image acquisition range of the image acquisition module. After determining a suitable stray angle of the diffuse emission sheet, the scattered light generated by the light source passing through the diffuse emission sheet can be evenly distributed on the vehicle body and effectively fall into the image acquisition range of the image acquisition module, so that high-quality shooting of the vehicle body can be achieved, providing accurate and reliable data support for the image acquisition module.

[0047] In one embodiment, specifically, the light source module includes an LED light source 1, a beam expander lens 6 is provided at the beam output end of the LED light source 1, and a diffuse reflector 2 is provided at the beam output end of the LED light source 1. The image acquisition module includes an imaging camera 3, the shooting direction of the imaging camera 3 and the irradiation direction of the LED light source 1 form a certain angle with each other, and the scattered light beam generated by the LED light source 1 after passing through the diffuse reflector 2 is distributed on the vehicle body and falls into the shooting area of ​​the imaging camera 3.

[0048] In one embodiment, optionally, there are multiple diffuse emitting sheets 2, and the diameter, thickness, reflectivity, spectral range, Lambertian property, optical flatness, or stray angle of each diffuse emitting sheet 2 are different from each other, and each diffuse emitting sheet 2 can be replaced on the light beam output end of the LED light source 1. It can be understood that since the diffuse emitting sheets 2 with different characteristics can be replaced on the light beam output end of the LED light source 1, in actual applications, the diffuse emitting sheets 2 on the light beam output end of the LED light source 1 can be flexibly replaced for different application scenarios (for example, for train bodies of various shapes, or the installation position and angle of the imaging camera 3, etc.), and the distribution of the scattered light beam of the LED light source 1 on the body is optimized to ensure the imaging effect of the image detection system.

[0049] Embodiment 2

[0050] This embodiment is an optional solution of the first embodiment. Figure 4 As shown, the diffuse reflector 2 is connected to a displacement mechanism 4, which can be set as an electric telescopic arm or a screw drive mechanism. When in operation, the diffuse reflector 2 is linearly displaced on the light path of the LED light source 1 through the displacement mechanism 4. The displacement mechanism 4 assists the panoramic image detection system of the rail train vehicle and cooperates with the imaging camera 3. The system can adjust the distance between the diffuse reflector 2 and the light-emitting end of the LED light source 1 according to the real-time imaging quality of the imaging camera 3, and assist in optimizing and adjusting the scattering effect of the light of the LED light source 1 on the vehicle body.

[0051] Embodiment 3

[0052] This embodiment is an optional solution of the first embodiment. Figure 5 and Figure 6As shown, it also includes a rotating mechanism 5, which can be optionally set as a turntable, and the turntable is connected to a steering gear through transmission. The system can accurately control the rotation angle of the turntable through the steering gear control. A plurality of diffuse emission sheets 2 with different characteristics surround the rotation axis of the rotating mechanism 5, and each diffuse emission sheet 2 is circumferentially distributed on the outer periphery of the rotating mechanism 5, and each diffuse emission sheet 2 is respectively connected to the rotating mechanism 5, so that each diffuse emission sheet 2 can move with the rotating mechanism 5. During operation, the rotating mechanism 5 drives each diffuse emission sheet 2 to rotate and drives each diffuse emission sheet 2 with different characteristics to move to the light beam output end of the LED light source 1 in turn. It can be understood that the rotating mechanism 5 can make a plurality of diffuse emission sheets 2 with different characteristics rotate and cut in turn in front of the light beam output end of the LED light source 1, and more flexibly and conveniently assist the image detection system to optimize the distribution of the scattered light beam of the LED light source 1 on the vehicle body. That is to say, a plurality of diffuse emitting plates 2 are distributed circumferentially around the outer periphery of the rotating mechanism 5, and each diffuse emitting plate 2 is connected to the rotating mechanism 5. The rotating mechanism 5 can drive these diffuse emitting plates 2 to rotate, so that the diffuse emitting plates 2 with different characteristics can be moved to the light beam output end of the LED light source 1 in turn, thereby facilitating the dynamic switching of the diffuse emitting plates on the light beam output end of the light source. Through the dynamic switching of the rotating mechanism 5, the system can use different diffuse emitting plates in different situations, thereby realizing flexible adjustment of the light source parameters, which not only improves the adaptability of the system, but also helps to reduce the complexity and cost of the system, and can assist in optimizing the illumination effect of the light source on the train body. The rotating mechanism 5 can be used to enable the system to dynamically call suitable diffuse emitting plates according to different detection environments and requirements, thereby achieving the best lighting effect on the train body and ensuring the accuracy and efficiency of image detection.

[0053] Furthermore, if Figure 7 and Figure 8As shown, the flip mechanism 7 also includes a flip mechanism 7, which can be set as a swing arm, one end of the swing arm is connected to a steering gear, and the swing arm is controlled by the steering gear, and the other end of the swing arm can be connected to the fixed part of the above-mentioned rotating mechanism 5, such as the steering gear housing connected to the rotating mechanism 5. When working, the system controls the swing of the rotating mechanism 5 through the swing arm. When the swing arm drives the rotating mechanism 5 to flip to the front of the light beam output end of the LED light source 1, the diffuse emission sheet 2 mounted on the outer periphery of the rotating mechanism 5 can scatter the light beam of the light source. On the contrary, when the swing arm drives the rotating mechanism 5 to flip and leave the front of the light beam output end of the LED light source 1, the diffuse emission sheet 2 mounted on the outer periphery of the rotating mechanism 5 also leaves the light beam output end of the LED light source 1, and the diffuse emission sheet 2 no longer scatters the light beam of the light source. Through the above structural scheme, in actual operation, when the system needs to start or adjust the light source scattering mode, the swing arm will swing under the drive of the steering gear, driving the entire rotating mechanism (including the diffuse emission sheet installed thereon) to flip to the front of the light beam output end of the LED light source. At this time, the diffuse emission sheet on the rotating mechanism can effectively intercept and scatter the light beam emitted by the light source, forming a diffuse light beam evenly distributed on the surface of the train body, providing ideal lighting conditions for the image acquisition module. Conversely, when the system does not need a diffuse light source, the swing arm will drive the rotating mechanism to flip away from the front of the light beam output end, and the diffuse emission sheet will move away, thereby avoiding interference with the light beam of the light source, ensuring that the system can flexibly switch working modes in different detection stages.

[0054] Furthermore, if Fig. 9 As shown, the telescopic end of the displacement mechanism 4 is transmission-connected to the fixed part of the flipping mechanism 7. When in operation, the displacement mechanism 4 can drive the flipping mechanism 7, the rotating mechanism 5 and the diffuse emission sheet 2 to move linearly on the optical path of the LED light source 1, thereby further improving the flexibility of position adjustment of the diffuse emission sheet 2, so as to more comprehensively assist the train image detection system in collecting high-quality images.

[0055] Embodiment 4

[0056] This embodiment is a further solution of the third embodiment. In order to optimize the vehicle panoramic image detection system, the system can flexibly adjust the coordinated work of the diffuse reflection sheet 2, the rotating disk of the rotating mechanism 5, the swing arm of the flip mechanism 7 and the telescopic arm of the displacement mechanism 4 according to the real-time imaging quality to ensure the optimization of image quality. This embodiment performs coordinated control of the rotating disk, the swing arm and the telescopic arm according to the image quality evaluation index and the relevant automatic control logic. The execution method thereof is as follows:

[0057] In the first step, the system defines the image quality evaluation indicators to automatically determine the clarity and exposure of the image. The evaluation indicators include contrast, brightness and clarity.

[0058] The contrast index is used to measure the brightness difference in the image. Too low a contrast ratio indicates overexposure or underexposure. The contrast ratio of the image is evaluated by the calculation result of the following formula;

[0059]

[0060] In the formula, I max and I min are the maximum and minimum brightness values ​​in the image respectively;

[0061] The average brightness of the image is represented by the brightness index and is evaluated by the following pixel value average calculation formula;

[0062]

[0063] In the formula, I i represents the brightness value of the i-th pixel, N represents the total number of pixels, if the brightness value exceeds a certain preset threshold, overexposure may occur;

[0064] When evaluating by clarity index, the image edge detection is used for evaluation, and the clarity of the image is calculated using the following formula related to the gradient operator;

[0065]

[0066] In the formula, and Respectively represent the horizontal and vertical gradients of the image;

[0067] Based on the above evaluation indicators, a comprehensive image quality score Q can be defined, and its formula is as follows;

[0068] Q = αC + βB + γS;

[0069] Where α, β, and γ are weight coefficients, which can be preset by the system through experiments. If the image quality score Q exceeds a certain threshold Q threshold , it means that the image quality is poor and the system parameters need to be adjusted;

[0070] The second step is to determine whether to call the diffuse reflection film;

[0071] When the image quality score Q does not meet expectations, the system controls the swing arm to move the rotating disk so that the diffuse reflector cuts into the front of the light-emitting end of the LED light source. The control logic is as follows:

[0072] 1. If Q threshold , perform the following steps:

[0073] (S1), the swing arm drives the rotating disk to move, cutting into the diffuse reflection sheet to the light output end of the LED light source; (S2), the rotating disk stops and starts to detect the effects of different diffuse reflection sheets.​

[0074] 2. If Q ≥ Q threshold , the system maintains the existing settings without making any adjustments.

[0075] The third step is to select the best diffuse reflector;

[0076] When the system determines that diffuse reflectors are needed to scatter light, the rotating disk rotates diffuse reflectors with different physical properties one by one, and compares the image quality in real time by collecting new images. Assuming that each diffuse reflector has different physical properties MP i (including reflectivity, diameter, spectral range, etc., these parameters will affect the light scattering effect of the system);

[0077] The physical properties of the diffuse reflector affect the uniformity of imaging. Using the above imaging quality evaluation function Q, the system automatically selects the diffuse reflector that can maximize Q. The control logic is as follows:

[0078] (S1), define Q current Score the current imaging quality and traverse each diffuse reflection piece MP i ; (S2), for each MP i , recalculate Q after imaging i ;

[0079] (S3) Select the diffuse reflector MP that maximizes Q best , that is, execute according to the following formula:

[0080] MP best = arg max i (Q i );

[0081] Step 4: Adjust the distance d between the diffuse reflector and the LED light source;

[0082] After the most suitable diffuse reflector is selected, the system adjusts the optical distance d between the diffuse reflector and the LED light source through the telescopic arm to further optimize the light scattering effect. In order to find the optimal distance d opt , define an optimization problem to optimize the effect of scattered light on the image; the optimization goal is to maximize the image quality Q, which is executed according to the following formula:

[0083] d opt = arg max d Q(d);

[0084] By adjusting the telescopic arm, the system changes the distance d within a certain range and dynamically adjusts it through the real-time feedback of the image quality value Q(d) until the optimal distance is found.

[0085] The following is a calculation example that implements the above method:

[0086] Assume that the system uses three different diffuse reflectors with the following physical properties:

[0087] 1-Diffuse reflector 1: reflectivity 70%, diameter 5cm;

[0088] 2-Diffuse reflector 2: reflectivity 80%, diameter 6cm;

[0089] 3-Diffuse reflector 3: reflectivity 90%, diameter 7cm;

[0090] The system first evaluates the quality of the current image based on the imaging quality. Assuming that the Q current =0.6, and the preset threshold Q threshold =0.75, therefore, the system decides to cut a diffuse reflector into the light-emitting end of the LED light source;

[0091] When selecting diffuse reflectors, the system tries and calculates the image quality under different diffuse reflectors one by one;

[0092] 1-After using diffuse reflector 1, Q 1 =0.7;

[0093] 2-After using diffuse reflector 2, Q 2 =0.8;

[0094] 3-After using diffuse reflector 3, Q 3 =0.75;

[0095] System Selection Q 2 The corresponding diffuse reflector 2 has the highest imaging quality score. Then, the system further optimizes Q by adjusting the distance d between the diffuse reflector and the LED light source. Assuming that as the distance d changes, the system observes that the maximum value of the quality score Q appears at d = 10 cm, at which time Q = 0.85, so the system sets this distance as the optimal distance.

[0096] In summary, by introducing an automatic judgment and adjustment mechanism based on image quality, the vehicle panoramic image detection system can optimize the imaging effect in real time. By controlling the coordinated work of the swing arm, rotating disk, telescopic arm and diffuse reflectors with different physical properties, the system can effectively avoid overexposure and loss of image details, and ensure the clarity and accuracy of the vehicle image.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing a panoramic image detection system for a rail vehicle, characterized in that: A diffuse emission light-transmitting component is arranged on the output light path of the light source module of the image detection system, and the light source light output from the light source module to the vehicle body is scattered by the diffuse emission light-transmitting component. The image acquisition module of the image detection system performs image acquisition on the scattered light beam area of ​​the vehicle body.

2. The method for optimizing a panoramic image detection system for a railway train vehicle according to claim 1, characterized in that: The transmittance of the diffuse reflection light-transmitting component is detected by a detection instrument, so that the transmittance of the light source to the diffuse reflection light-transmitting component is controlled to be 90% or above.

3. The method for optimizing a panoramic image detection system for a railway train vehicle according to claim 1, characterized in that: The stray angle of the diffuse emission light-transmitting component is determined according to the field of view angle and shooting range of the image acquisition module, so that the scattered light generated by the light source passing through the diffuse emission light-transmitting component is distributed on the vehicle body and falls into the image acquisition range of the image acquisition module.

4. An optimized structure of a panoramic image detection system for a railway train vehicle, characterized in that: It includes a light source module and an image acquisition module of an image detection system; A diffuse emission light-transmitting member is arranged on the light source light path of the light source module; The incident light beam of the light source module passes through the diffuse reflection light-transmitting member and generates a scattered light beam distributed on the vehicle body; The image acquisition area of ​​the vehicle body by the image acquisition module overlaps with the scattered light beam area projected to the vehicle body by the light source module.

5. The optimized structure of the railway train vehicle panoramic image detection system according to claim 4 is characterized in that: The transmittance of the diffuse reflection light-transmitting element is ≥90%.

6. The optimized structure of the railway train vehicle panoramic image detection system according to claim 4 is characterized in that: The light source module comprises an LED light source (1); The diffuse reflection light-transmitting component comprises a diffuse reflection sheet (2); Wherein, the diffuse emission sheet (2) is arranged at the light beam output end of the LED light source (1).

7. The optimized structure of the railway train vehicle panoramic image detection system according to claim 6 is characterized in that: The image acquisition module comprises an imaging camera (3); The shooting direction of the imaging camera (3) and the irradiation direction of the LED light source (1) form a certain angle with each other; Wherein, the LED light source (1) passes through the diffuse emission sheet (2) The scattered light beam generated later is distributed on the vehicle body and falls into the shooting area of ​​the imaging camera (3).

8. The optimized structure of the railway train vehicle panoramic image detection system according to claim 6 is characterized in that: The diffuse emitting sheet (2) is connected in transmission to a displacement mechanism (4), and the displacement mechanism (4) drives the diffuse emitting sheet (2) to move linearly on the light path of the LED light source (1).

9. The optimized structure of the railway train vehicle panoramic image detection system according to claim 6, characterized in that: The number of the diffuse emitting sheets (2) is several, and the diameters, thicknesses, reflectivities, spectral ranges, Lambertian properties, optical flatnesses, or stray angles of the diffuse emitting sheets (2) are different from each other; Each of the diffuse emission sheets (2) can be arranged replaceably on the light beam output end of the LED light source (1).

10. The optimized structure of the railway train vehicle panoramic image detection system according to claim 9, characterized in that: It also comprises a rotating mechanism (5), wherein each of the diffuse emission sheets (2) surrounds the rotating axis of the rotating mechanism (5) and is circumferentially distributed on the periphery of the rotating mechanism (5) and is respectively connected to the rotating mechanism (5); The rotating mechanism (5) drives each of the diffuse emission sheets (2) to rotate and drives each of the diffuse emission sheets (2) to move to the light beam output end of the LED light source (1) in turn.

Images