Backlight imaging auxiliary device for shooting two-dimensional image of granular material
By combining the grain backlight positioning plate with the light shield, interference factors in traditional grain photography are eliminated, providing a stable optical environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGAN UNIV
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional grain imaging methods are prone to introducing interference factors, resulting in blurred boundaries between grains and the background, increasing the difficulty of subsequent image processing, and seriously interfering with the accuracy of precise quantitative digital image processing and morphological analysis.
The design employs a combination of a particle backlight positioning plate and a light-shielding canopy. The flexible backlight structure and matrix-arranged circular grooves position the particles, while the fully enclosed light-shielding canopy provides uniform illumination and isolates external light interference, ensuring the stability of image acquisition and ease of operation.
The device provides a stable optical environment through the coordinated design of the particle backlight imaging auxiliary device and the coordinated design of the particle backlight positioning plate and the light shield.
Smart Images
Figure CN224263016U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of digital analysis equipment for particulate materials, and specifically relates to a backlight imaging auxiliary device for capturing two-dimensional images of particulate materials. Background Technology
[0002] In the fields of road engineering, civil engineering, and materials science, the two-dimensional morphological characteristics of particulate materials have a crucial impact on their macroscopic properties. Acquiring the two-dimensional morphology of particles and analyzing their contour features through image processing techniques has become a common method in these research areas. However, traditional particle imaging methods are often too crude and rudimentary, frequently introducing interference factors during the imaging process (such as shadows and poor lighting conditions), resulting in blurred boundaries between particles and the background. This significantly increases the difficulty of subsequent image processing and severely interferes with the accuracy of precise quantitative digital image processing and morphological analysis. Utility Model Content
[0003] To address the aforementioned problems in the existing technology, this utility model provides a backlit imaging auxiliary device for capturing two-dimensional images of particulate materials. The technical problem to be solved by this utility model is achieved through the following technical solution:
[0004] This utility model provides a backlit imaging auxiliary device for capturing two-dimensional images of particulate materials, comprising: a particulate backlight positioning plate, and a light-shielding shed for accommodating the particulate backlight positioning plate, wherein the top of the light-shielding shed has a hole for placing the shooting equipment; wherein, the particulate backlight positioning plate comprises: a matte base plate, a diffused light source plate, and a particulate positioning plate stacked sequentially from bottom to top; the diffused light source plate has a built-in flexible diffused backlight structure for providing diffused flexible light to the particulate positioning plate; the surface of the particulate positioning plate has a plurality of circular grooves arranged in a matrix, so that each circular groove can accommodate one particulate material to be photographed.
[0005] Optimally, the distributed light source board includes: an LED dot array and a diffuser cloth and / or a light guide plate covering the LED dot array; wherein, the LED dot array includes a plurality of LED dot light sources uniformly distributed on the upper surface of the matte substrate, and each LED dot light source is connected to an external power supply; in the case where the distributed light source board includes: the LED dot array, the diffuser cloth and the light guide plate, the light guide plate covers the LED dot array and the diffuser cloth covers the light guide plate.
[0006] Ideally, the inner wall of each circular groove is a spherical arc surface.
[0007] Ideally, the diameter of each circular groove is between 3cm and 5cm.
[0008] Ideally, the matte base plate has a cuboid structure, and the thickness of the matte base plate is at least 5cm, the length is 45cm to 50cm, and the width is at least 60cm.
[0009] Optimally, the light-blocking canopy includes: a fixed frame, a light-blocking cloth, and a roller blind; wherein the light-blocking cloth covers the top surface of the fixed frame and three adjacent side facades in a fixed connection manner to achieve full circumferential light-blocking closure, wherein the surface of the light-blocking cloth covering the top surface of the fixed frame has the holes; the roller blind is retractably disposed on the fourth side facade of the fixed frame, and together with the side facade, defines an operation opening for the particle backlight positioning plate to move in and out, so that the roller blind can switch between a light-blocking state and an avoidance state.
[0010] Ideally, the fixed frame is a cuboid structure.
[0011] Ideally, a lampshade is also provided between the LED dot array and the diffuser and / or the light guide plate.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] To address the problem that traditional particle imaging methods are prone to introducing interference, resulting in blurred boundaries between particles and the background, significantly increasing the difficulty of subsequent image processing, and severely interfering with the accuracy of precise quantitative digital image processing and morphological analysis, this invention provides a backlit imaging auxiliary device for capturing two-dimensional images of particle materials. This device significantly improves the quality of two-dimensional images of particle materials through the coordinated design of a particle backlight positioning plate and a light-shielding canopy. Specifically, the matte base plate combined with a distributed light source plate utilizes a flexible backlight structure to generate uniform diffused light, effectively eliminating local glare and contour shadows caused by traditional point light sources, ensuring clear and discernible particle boundaries. The matrix-arranged circular grooves precisely position the particles, avoiding imaging interference caused by sample stacking or displacement. The fully enclosed structure of the light-shielding canopy isolates external ambient light interference, and the top opening directionally controls the imaging light path, providing a stable optical environment for high-precision image acquisition. This device achieves synergistic improvements in three dimensions: light source optimization, sample positioning, and environmental control, laying a reliable image foundation for subsequent particle morphology analysis. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of a backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to an embodiment of the present invention;
[0015] Figure 2 This is a top view of the particle backlight positioning plate provided by this utility model;
[0016] Figure 3This is a schematic diagram of the backlight imaging auxiliary device for capturing two-dimensional images of particulate materials in the working state, provided by this utility model.
[0017] Figure label:
[0018] 1-Particle backlight positioning plate; 2-Light-shielding shed; 3-Shooting equipment; 4-Camera bracket; 11-Matte base plate; 12-Dispersed light source plate; 13-Particle positioning plate; 21-Fixed shed frame; 22-Light-shielding cloth; 23-Roller blind; 121-LED dot array; 122-Soft light cloth; 123-Light guide plate; 131-Circular groove; 201-Hole. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.
[0020] Figure 1 This is a schematic diagram of the structure of a backlight imaging auxiliary device for capturing two-dimensional images of particulate materials, provided in an embodiment of this utility model. Figure 1 (a) is a schematic diagram of the overall structure of the backlight imaging auxiliary device for capturing two-dimensional images of particulate materials. Figure 1 (b) in the figure is a front view of the particle backlight positioning plate.
[0021] like Figure 1 As shown, the backlight imaging auxiliary device for capturing two-dimensional images of particulate materials includes: a particulate backlight positioning plate 1, and a light shield 2 for accommodating the particulate backlight positioning plate 1. The top of the light shield 2 has a hole 201 for placing the shooting device 3. The particulate backlight positioning plate 1 includes: a matte base plate 11, a diffused light source plate 12, and a particulate positioning plate 13 stacked from bottom to top. The diffused light source plate 12 has a built-in flexible diffused backlight structure for providing diffused flexible light to the particulate positioning plate 13. The surface of the particulate positioning plate 13 has a plurality of circular grooves 131 arranged in a matrix, so that each circular groove 131 can accommodate a particulate material to be photographed.
[0022] Here, the matte base plate 11 has a cuboid structure, and the thickness of the matte base plate 11 is at least 5cm, the length is 45cm to 50cm, and the width is at least 60cm. Preferably, the matte base plate 11 is a cuboid white board with a thickness of 5cm and a length and width of 48cm × 60cm.
[0023] In one possible implementation, the matte base plate 11, the distributed light source plate 12, and the particle positioning plate 13 all have a length and width of 48cm × 60cm.
[0024] Here, the distributed light source board 12 includes: an LED dot array 121 and a diffuser cloth 122 or a light guide plate 123 covering the LED dot array 121; wherein, the LED dot array 121 includes a plurality of LED point light sources uniformly distributed on the upper surface of the matte base plate 11, and each LED point light source is connected to an external power supply; when the distributed light source board 12 includes: the LED dot array 121, the diffuser cloth 122 and the light guide plate 123, the light guide plate 123 covers the LED dot array 121, and the diffuser cloth 122 covers the light guide plate 123. Furthermore, a lampshade is also disposed between the LED dot array 121 and the diffuser cloth 122 or the light guide plate 123.
[0025] Here, the LED dot array 121 is formed by densely arranging multiple LED point light sources (e.g., micro LED chips with a size of less than 0.5 mm) on a flexible substrate (such as an FPC circuit board). By concentrating the LED point light sources at a high density, the light-emitting area of a single LED can be effectively eliminated, reducing the "focusing effect" of the point light source, thereby eliminating the generation of contour shadows of the particle material to be photographed (not shown in the figure), and ensuring the accuracy and clarity of particle morphology imaging.
[0026] It should be noted that the diffuser cloth 122 and the light guide plate 123 serve the same purpose: to uniformly distribute the light generated by the LED dot array 121. However, there are subtle differences between the two. The diffuser cloth 122 is used to diffuse light through fiber gaps or coatings, reducing brightness contrast and eliminating localized glare. The light guide plate 123 is used to convert point / line light sources into uniform surface light sources by utilizing total internal reflection, microstructure scattering, and light path guidance, achieving uniform light distribution. The uniformity requirements for the light guide plate 123 are higher than those for the diffuser cloth 122. Technicians can choose to use either the diffuser cloth 122 or the light guide plate 123 according to actual shooting needs. When high shooting accuracy is required, both the diffuser cloth 122 and the light guide plate 123 can be used simultaneously. At this time, a light guide plate 123 is first covered on the LED dot array 121 to convert the LED dot array 121 into a preliminary uniform surface light source. Then, a diffuser cloth 122 is covered on the light guide plate 123 to further scatter the light emitted from the light guide plate 123 and eliminate residual minor brightness differences or structural textures such as moiré patterns caused by the dots on the light guide plate 123.
[0027] Please continue to refer to Figure 1 Here, the inner wall of each circular groove 131 is a spherical arc surface, and the diameter of each circular groove 131 is 3cm to 5cm, preferably 4cm. Figure 2 This is a top view of the particle backlight positioning plate provided by this utility model. Figure 2 As shown, multiple circular grooves 131 are densely and evenly arranged. In one possible implementation, the number of circular grooves 131 is 180, arranged in a regular array of 15 × 12.
[0028] The structure of the shade canopy is now described. Please refer to [link / reference]. Figure 1 The light-blocking canopy 2 includes: a fixed frame 21, a light-blocking cloth 22, and a roller blind 23; wherein, the light-blocking cloth 22 covers the top surface of the fixed frame 21 and the three adjacent side facades in a fixed connection manner to achieve full circumferential light blocking and closure, wherein the surface of the light-blocking cloth 22 covering the top surface of the fixed frame 21 has holes 201; the roller blind 23 is rolled up and disposed on the fourth side facade of the fixed frame 21, and together with the side facade, defines an operation opening for the particle backlight positioning plate 1 to move in and out, so that the roller blind 23 can switch between a light-blocking state and an avoidance state.
[0029] Here, the fixed frame 21 is a cuboid structure, and both the light-blocking cloth 22 and the roller blind 23 are black and opaque to avoid interference from ambient light. When the roller blind 23 is rolled up and in the avoidance state, the particle backlight positioning plate 1 containing multiple particles is placed in or taken out. When the roller blind 23 is lowered and in the light-blocking state, the shooting device 3 is used to shoot multiple particles.
[0030] In one embodiment, a technician uses a camera bracket 4 to fix the shooting device 3 to the top of the shade shed 2. Then, a piece of particle material to be photographed is placed in each circular groove 131 of the particle backlight positioning plate 1. The roller shutter 23 is manually rolled up to place the particle backlight positioning plate 1 in the shade shed 2. Power is supplied to the dispersed light source plate 12 in the particle backlight positioning plate 1 to generate uniform, flexible light. Then, the roller shutter 23 is manually lowered, and multiple pieces of particle material in the particle backlight positioning plate 1 are photographed through the holes 201. Figure 3 As shown.
[0031] To address the problem that traditional particle imaging methods are prone to introducing interference, resulting in blurred boundaries between particles and the background, significantly increasing the difficulty of subsequent image processing, and severely interfering with the accuracy of precise quantitative digital image processing and morphological analysis, this invention provides a backlit imaging auxiliary device for two-dimensional image acquisition of particle materials. This device, through the coordinated design of a particle backlight positioning plate and a light-shielding canopy, effectively solves the problem of blurred image boundaries caused by uneven lighting and environmental interference in traditional particle imaging. Specifically, a distributed light source plate combined with a flexible backlight structure and light-guiding soft light components eliminates local glare and shadows, providing a uniform diffused lighting environment for the particles. A matrix-style grooved positioning plate ensures stable placement of particles without interference, and the fully enclosed structure of the light-shielding canopy blocks external stray light interference. This device improves image acquisition quality while also ensuring ease of operation, enabling rapid sample loading through a rollable curtain, laying a reliable image foundation for subsequent accurate morphological analysis.
[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0033] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. A backlight imaging auxiliary device for capturing two-dimensional images of particulate materials, characterized in that, include: Particle backlight positioning plate (1), and a light shield (2) for accommodating the particle backlight positioning plate (1), wherein the top of the light shield (2) is provided with a hole (201) for placing the shooting equipment (3). The particle backlight positioning plate (1) includes: a matte base plate (11), a distributed light source plate (12), and a particle positioning plate (13) stacked from bottom to top. The dispersed light source plate (12) has a built-in flexible dispersed backlight structure for providing diffused flexible light to the particle positioning plate (13); The surface of the particle positioning plate (13) is provided with a plurality of circular grooves (131) arranged in a matrix, so that each circular groove (131) can accommodate a particle material to be photographed.
2. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 1, characterized in that, The distributed light source board (12) includes: an LED dot array (121) and a soft light cloth (122) and / or a light guide plate (123) covering the LED dot array (121); wherein, the LED dot array (121) includes a plurality of LED dot light sources uniformly distributed on the upper surface of the matte base plate (11), and each LED dot light source is connected to an external power source; In the case where the distributed light source plate (12) includes the LED dot array (121), the diffuser cloth (122) and the light guide plate (123), the light guide plate (123) covers the LED dot array (121) and the diffuser cloth (122) covers the light guide plate (123).
3. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 1, characterized in that, The inner wall of each circular groove (131) is a spherical arc surface.
4. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 3, characterized in that, The diameter of each circular groove (131) is 3cm to 5cm.
5. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 1, characterized in that, The matte base plate (11) has a cuboid structure, and the thickness of the matte base plate (11) is at least 5cm, the length is 45cm to 50cm, and the width is at least 60cm.
6. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 1, characterized in that, The shading canopy (2) includes: a fixed frame (21), a shading cloth (22), and a roller blind (23); The light-blocking cloth (22) covers the top surface of the fixed frame (21) and the three adjacent side facades in a fixed connection manner to achieve full circumferential light blocking and sealing. The light-blocking cloth (22) covering the top surface of the fixed frame (21) has the holes (201) on its surface. The roller blind (23) is retractably disposed on the fourth side facade of the fixed frame (21) and together with the side facade defines an operation opening for the particle backlight positioning plate (1) to move in and out, so that the roller blind (23) can switch between a light-blocking state and an avoidance state.
7. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 6, characterized in that, The fixed frame (21) is a cuboid structure.
8. The backlight imaging auxiliary device for capturing two-dimensional images of particulate materials according to claim 2, characterized in that, A lampshade is also provided between the LED dot array (121) and the diffuser cloth (122) and / or the light guide plate (123).