Material image acquisition system, color sorter and quality analyzer

Abstract

The utility model discloses a material image acquisition system, a color sorter and a quality analyzer, the material image acquisition system is provided with a material passing area, and the material image acquisition system comprises a camera, a light source piece and a shading plate. The light source piece and the camera are located on the two sides of the material passing area to serve as background light sources, and / or the light source piece and the camera are located on the same side of the material passing area to serve as irradiation light sources, the light shielding plate comprises a first light shielding plate, and the first light shielding plate is provided with a background grating arranged corresponding to the background light sources and / or an irradiation grating arranged corresponding to the irradiation light sources. The background grating comprises a background light transmission area and a first light transmission area. The irradiation grating comprises an irradiation light passing area and a second light passing area. The passing path of light in the space is controlled by arranging the grating on the light shielding plate, and one light shielding plate can process multiple light paths, so that the space is saved, and the installation is convenient; and a plurality of gratings can be arranged on the shading plate, and the opening size can be randomly manufactured, so that the shading plate can adapt to different application scenes.

Description

Technical Field

[0001] This utility model relates to the field of material detection and identification technology, and in particular to a material image acquisition system, a color sorter, and a quality analyzer. Background Technology

[0002] In material sorting and quality inspection technologies, optical systems are widely used to detect imaging differences. Reflected light from the material after it is illuminated by a light source enters the camera to form an image. For some materials or light sources, a background light source is also required to improve the imaging effect and facilitate identification and detection. Therefore, the optical system for material identification is relatively complex. If multiple light sources are used simultaneously, such as a combination of visible light, infrared light, ultraviolet light, hyperspectral light, and X-rays, the optical path system becomes even more complex. During the imaging process, there may be situations where light from the light source directly illuminates the camera or the background light source, or where reflected light from the material enters the camera corresponding to the background light source or other light sources. This can affect the accuracy of the image information acquired by the camera, thereby affecting the identification and sorting results.

[0003] In related technologies, adding baffles near the light source, camera, and background light source can block stray light. This method can meet the needs of simple optical paths, but for complex optical paths, adding baffles becomes extremely cumbersome. In addition, the reflection of the internal structure of the device is difficult to predict, so the light blocking effect is not ideal. Moreover, the influence of stray light is difficult to detect, which poses great difficulties for image optimization. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a material image acquisition system, which is equipped with a light-shielding plate to process multiple light paths, facilitating installation and saving space.

[0005] Another aspect of this invention proposes a color sorter having the aforementioned material image acquisition system.

[0006] In another aspect, this utility model proposes a quality analyzer having the above-mentioned material image acquisition system.

[0007] According to a first aspect embodiment of the present invention, a material image acquisition system has a material passage area, and the material image acquisition system includes: at least one camera; a light source for illuminating the material in the material passage area, wherein at least one light source and the camera are located on opposite sides of the material passage area as background light sources, and / or at least one light source and the camera are located on the same side of the material passage area as illumination light sources; and a light shield, the light shield including a first light shield located between the camera and the material passage area, the first light shield having a corresponding background light source. The light source includes a background grating and / or an illumination grating corresponding to the illumination light source; wherein the background grating includes: a background light-transmitting area for allowing the background light source to illuminate the material observation position, and a first light-transmitting area located between the camera and the material observation position, the background light-transmitting area being located on a first light-shielding plate on the same side as the background light source, and the first light-transmitting area being located on a first light-shielding plate on the same side as the camera on which the background light source projects; the illumination grating includes: an illumination light-transmitting area for allowing the illumination light source to illuminate the material observation position, and a second light-transmitting area located between the camera and the material observation position.

[0008] According to the material image acquisition system of the first aspect of the present invention, the light path in space is controlled by setting a light shield and setting a grating on the light shield. One light shield can process multiple light paths, saving space and facilitating installation. Furthermore, multiple gratings can be arranged on the light shield, and the opening size can be arbitrarily manufactured, thereby adapting to different application scenarios.

[0009] According to some embodiments of the present invention, in the material image acquisition system, the same camera is provided with at least two light source elements that serve as the illumination light source, so as to illuminate the material observation position from different angles; the first light shield is provided with an illumination light transmission area corresponding to the illumination light source.

[0010] According to some embodiments of the material image acquisition system of the present invention, the light shield further includes: a second light shield, the second light shield being located between the first light shield and the camera, the second light shield being provided with a secondary reinforcement grating, the secondary reinforcement grating being configured corresponding to the background grating and / or the illumination grating.

[0011] According to some embodiments of the material image acquisition system of the present invention, the light-shielding plate is an opaque rigid plate, and the background grating and / or the illumination grating are light-transmitting areas on the rigid plate.

[0012] According to some embodiments of the present invention, the material image acquisition system includes a light-shielding plate comprising: a transparent plate; and a light-shielding layer disposed on the transparent plate, wherein the light-shielding layer is disposed away from the background grating and / or the illumination grating.

[0013] According to some embodiments of the present invention, the material image acquisition system comprises two sets of cameras located on opposite sides of the material passage area; one set of cameras is a transmission camera for acquiring a transmission image of the material observation position; the other set of cameras is a reflection camera for acquiring a reflection image of the material observation position; in the material image acquisition system, on the same side of the reflection camera, a plurality of light sources are provided to serve as at least two illumination light sources and at least one background light source; there are two first light-shielding plates located on opposite sides of the material passage area; the light from the background light source passes through the background light transmission area and illuminates the material, and the transmission camera acquires a projected image of the material through the first light transmission area.

[0014] According to some embodiments of the present invention, the material image acquisition system comprises two sets of cameras, which are located on both sides of the material passage area; each camera is provided with an illumination light source on both sides of its optical axis, and the two cameras on the same side share an illumination light source between them.

[0015] According to some embodiments of the present invention, in the material image acquisition system, at least two cameras are provided on the same side of the material passage area; the at least two cameras are staggered along a direction perpendicular to the extension direction of the material passage area.

[0016] A color sorter according to a second aspect of the present invention includes a material image acquisition system according to a first aspect of the present invention.

[0017] According to some embodiments of the present invention, the color sorter, by setting the material image acquisition system of the first aspect of the present invention, occupies less space, is easy to install, and is conducive to the miniaturization of the color sorter.

[0018] The quality analyzer according to a third aspect of the present invention includes a material image acquisition system according to a first aspect of the present invention.

[0019] According to the quality analysis of some embodiments of the present invention, by setting up the material image acquisition system of the first aspect embodiment of the present invention, the material image acquisition system occupies less space, is easy to install, and is conducive to the miniaturization of the quality analyzer.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of a material image acquisition system according to some embodiments of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a light-shielding plate according to some embodiments of the present utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a material image acquisition system according to other embodiments of the present invention;

[0025] Figure 4 This is a structural schematic diagram of a light-shielding plate according to other embodiments of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a material image acquisition system according to some embodiments of the present invention;

[0027] Figure 6 It is based on Figure 5 A magnified view of region A in the example shown;

[0028] Figure 7 This is a schematic diagram of the structure of a material image acquisition system according to some embodiments of the present invention.

[0029] Figure label:

[0030] Material image acquisition system 100, material passage area S, material baffle 101

[0031] Camera 1, Transmission Camera 11, Reflection Camera 12

[0032] Light source 2, background light source 21, background light 211, illumination light source 22, illumination light 221, blocked illumination light 222.

[0033] Light-shielding plate 3, light-transmitting area 3a, light-blocking area 3b; first light-shielding plate 31, background grating 311, background light-transmitting area 3111, first light-transmitting area 3112, illumination grating 312, illumination light-transmitting area 3121, second light-transmitting area 3122, second light-shielding plate 32, secondary reinforcement grating 321.

[0034] Material 200. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following is for reference. Figures 1-7 A material image acquisition system 100 according to an embodiment of the present utility model is described.

[0039] like Figure 1 As shown, according to some embodiments of the first aspect of the present invention, the material image acquisition system 100 has a material passage area S. The material image acquisition system 100 acquires image information of material 200 to facilitate subsequent operations such as identification and sorting of the image information. The material image acquisition system 100 includes: a camera 1, a light source 2, and a light shield 3.

[0040] There is at least one camera 1, and the light source 2 is used to illuminate the material 200 in the material passage area S. At least one light source 2 and the camera 1 are located on opposite sides of the material passage area S to serve as a background light source 21, and / or at least one light source 2 and the camera 1 are located on the same side of the material passage area S to serve as an illumination light source 22. The light shield 3 includes a first light shield 31 located between the camera 1 and the material passage area S. The first light shield 31 is provided with a background grating 311 corresponding to the background light source 21 and / or an illumination grating 312 corresponding to the illumination light source 22.

[0041] The background grating 311 includes: a background light-transmitting area 3111 for allowing the background light source 21 to illuminate the material observation position, and a first light-transmitting area 3112 located between the camera 1 and the material observation position. The background light-transmitting area 3111 is located on a first light-shielding plate 31 on the same side as the background light source 21, and the first light-transmitting area 3112 is located on a first light-shielding plate 31 on the same side as the camera 1 on which the background light source 21 projects.

[0042] The illumination grating 312 includes: an illumination light-transmitting area 3121 for allowing the illumination light source 22 to illuminate the material observation position, and a second light-transmitting area 3122 located between the camera 1 and the material observation position.

[0043] Material 200 is transported within the material passage area S. For example, when material 200 is transported using a conveyor belt, the area of ​​the conveyor belt is the material passage area S. The two sides of the material passage area S are defined as the two sides of the material passage area S, with perpendicular lines drawn from the transport direction of material 200. Optionally, the two sides can be located at opposite sides of the material passage area S along a 180° angle. For example, when material 200 is transported using a conveyor belt, the two sides located on either side of the width direction of the conveyor belt are considered the two sides of the material passage area S, and the two sides located on either side of the thickness direction of the conveyor belt are also considered the two sides of the material passage area S. Alternatively, the two sides can also be located at opposite sides of the material passage area S, but these two positions form a certain angle. The same side of the material passage area S is defined as the same side of the material passage area S, with perpendicular lines drawn from the transport direction of material 200.

[0044] There can be one or more cameras 1. When there are multiple cameras 1, the multiple cameras 1 can be placed on both sides of the material passage area S, or the multiple cameras 1 can all be set on the same side of the material passage area S.

[0045] The light source 2 is used to provide illumination light 221 to the material 200 and / or to provide background light 211 to the camera 1. When the light source 2 is a background light source 21, the background light source 21 provides background light 211 to the camera 1 located on the other side of the material passage area S opposite to the background light source 21. The background light 211 illuminates the material, thereby enabling the camera 1 on the other side to obtain a projected image of the material for detecting internal defects or opaque parts, thereby improving the image acquisition effect of the material image acquisition system 100.

[0046] When the light source 2 is used as the illumination light source 22, the illumination light source 22 provides illumination light 221 to the camera 1 located on the same side of the material passage area S relative to the illumination light source 22. The illumination light 221 illuminates the material 200 in the material 200 collection area and then reflects it to the camera 1 on the same side. The camera 1 collects clear image information of the material 200.

[0047] like Figure 1 and Figure 2 As shown, the present invention is provided with a light shield 3, which includes a first light shield 31 located between the camera 1 and the material passage area S. Since there can be one or more cameras 1, and the position of the camera 1 relative to the material passage area S can be changed, there can be one or more first light shields 31 to cooperate in being set between the camera 1 and the material passage area S.

[0048] The first light-blocking plate 31 can block light. A grating is also provided on the first light-blocking plate 31 to allow light to pass through. The first grating is provided with a background grating 311 corresponding to the background light source 21 and / or an illumination grating 312 corresponding to the illumination light source 22, which can be changed according to the configuration of the light source 2. It is worth noting that the area of ​​the light-blocking plate 3 also has a light-absorbing function, not only preventing light from passing through but also preventing light from being reflected back to the camera 1, thereby reducing stray light.

[0049] When the material image acquisition system 100 is equipped with a background light source 21, the background light source 21 and the camera 1 are respectively placed on both sides of the material passage area S. There are at least two first light shields 31, which are respectively placed on at least both sides of the material passage area S. The background grating 311 provided on the first light shield 31 includes a background light transmission area 3111 that allows the background light source 21 to illuminate the material observation position. The background light transmission area 3111 is provided on the first light shield 31 on the side of the material passage area S near the background light source 21. The background grating 311 also includes a first light transmission area 3112 located between the camera 1 and the material observation position. The first light transmission area 3112 is provided on the first light shield 31 on the side of the material passage area S near the camera 1.

[0050] A background grating 311 is formed by setting a first light-shielding plate 31. The background light 211 emitted by the background light source 21 illuminates the material observation position through the background light transmission area 3111 and continues to pass through the first light transmission area 3112 to the camera 1, which can capture the background light 211. The background light transmission area 3111 and the first light transmission area 3112 can control the light path in space, which not only ensures that the background light 211 is stably directed to the camera 1, but also blocks interfering stray light, processes the light path, reduces other stray light besides the background light 211 from entering the camera 1, and improves the accuracy of the image information acquired by the camera 1. In this way, only two first light-shielding plates 31 are needed to process most of the light paths, saving space and facilitating the installation of the scene.

[0051] When the material image acquisition system 100 is equipped with an illumination light source 22, the illumination light source 22 and the camera 1 are located on the same side of the material passage area S. The illumination grating 312 provided on the first light shield 31 includes an illumination light-transmitting area 3121 that allows the illumination light source 22 to illuminate the material observation position, and a second light-transmitting area 3122 located between the camera 1 and the material observation position.

[0052] An illumination grating 312 is formed by setting a first light-shielding plate 31. The illumination light 221 emitted by the illumination light source 22 illuminates the material observation position through the illumination light transmission area 3121. After being reflected by the material 200, it passes through the second light transmission area 3122 and is directed towards the camera 1. The camera 1 collects clear image information of the material 200. The illumination light transmission area 3121 and the second light transmission area 3122 can control the light path in space. This not only ensures that the illumination light 221 is stably directed towards the camera 1, but also blocks interfering stray light, thus processing the light path and reducing other stray light from entering the camera 1, thereby improving the accuracy of the image information collected by the camera 1. In this way, only one first light-shielding plate 31 is needed to process most of the light paths, saving space and facilitating installation.

[0053] When the material image acquisition system 100 is equipped with both a background light source 21 and an illumination light source 22, the background light source 21 and the camera 1 are positioned on opposite sides of the material passage area S, while the illumination light source 22 and the camera 1 are positioned on the same side of the material passage area S. There can be one or more cameras 1. In this case, only a first light-shielding plate 31 needs to be installed on both sides of the material passage area S to process most light paths. The first light-shielding plate 31 on the same side can simultaneously have a background light-transmitting area 3111, an illumination light-transmitting area 3121, and a second light-transmitting area 3122. It is worth noting that one or more of the background light-transmitting area 3111, the illumination light-transmitting area 3121, and the second light-transmitting area 3122 can be combined to allow different light rays to pass through together. A single light-shielding plate 3 can process most light paths, saving space and facilitating installation; furthermore, multiple gratings can be arranged on the light-shielding plate 3, and the opening size can be freely manufactured to adapt to different application scenarios.

[0054] The material observation location refers to the location where camera 1 collects images within the material passage area S. The material observation location can be located within the material passage area S, and can be one of several specific points where images are collected in a concentrated manner; or it can be any location within the material passage area S.

[0055] According to the material image acquisition system 100 of this utility model embodiment, the light path in space is controlled by setting a light shield 3 and setting a grating on the light shield 3. One light shield 3 can process multiple light paths, saving space and facilitating installation. Furthermore, multiple gratings can be arranged on the light shield 3, and the opening size can be made at will, so as to adapt to different application scenarios.

[0056] In some embodiments of this utility model, such as Figure 3 As shown, the same camera 1 is provided with at least two light source elements 2 that serve as illumination light sources 22 to illuminate the material observation position from different angles; the first light shield 31 is provided with an illumination light transmission area 3121 corresponding to the illumination light source 22; the camera 1 is simultaneously located within the illumination range of multiple illumination light sources 22.

[0057] For each camera 1, at least two illumination light sources 22 are set to illuminate the material observation position from different angles. The illumination light 221 from different angles illuminates the material 200, so that the camera 1 can collect clear image information of the material 200.

[0058] The illumination light source 22 is set on the same side as the camera 1 in the material passage area S. The first light shield 31 is provided with illumination light transmission area 3121 corresponding to the multiple illumination light sources 22, so that the illumination light 221 emitted by the multiple illumination light sources 22 can be respectively illuminated to the material observation position through the illumination light transmission area 3121.

[0059] Camera 1 is positioned within the illumination range of multiple illumination light sources 22, ensuring that the illumination light 221 generated by the multiple illumination light sources 22 can be captured by camera 1, allowing camera 1 to collect clear image information of the material 200.

[0060] Optionally, such as Figure 3 As shown, a first light-transmitting area 3112 is provided on the first light-shielding plate 31 corresponding to the camera 1. Light reflected from the material observation position can only pass through this first light-transmitting area 3112 to reach the camera 1. The first light-shielding plate 31 can block stray light and process the light path, improving the accuracy of the image information acquired by the camera 1. Alternatively, the first light-shielding plate 31 can be provided with multiple second light-transmitting areas 3122 corresponding to the illumination light source 22. Light reflected from the material observation position can pass through multiple first light-transmitting areas 3112 to reach the camera 1, which can increase the amount of light source and help increase the amount of image information collected by the camera 1.

[0061] In some embodiments of this utility model, such as Figures 3-5 As shown, the light-shielding plate 3 also includes a second light-shielding plate 32, which is located between the first light-shielding plate 31 and the camera 1. The second light-shielding plate 32 is provided with a secondary enhancement grating 321, which is set to correspond to the background grating 311 and / or the illumination grating 312.

[0062] The light shield 3 also includes a second light shield 32. There may still be some stray light in the optical path system, which may affect the imaging quality of the camera 1. By adding a second light shield 32, the light enters the camera 1 along the optical path defined by the first light shield 31 and the second light shield 32, thereby blocking other light and eliminating interference to the camera 1, and further improving the accuracy of the image information acquired by the camera 1.

[0063] The second light-shielding plate 32 can be set to correspond to the background grating 311 to further reduce interference with the background light 211, or it can be set to correspond to the illumination grating 312 to further reduce interference with the illumination light 221.

[0064] like Figure 3 As shown, when the second light-shielding plate 32 is set to correspond to the background grating 311, the second light-shielding plate 32 is set on the same side as the camera 1, and the second light-shielding plate 32 is located between the first light-shielding plate 31 and the camera 1. The secondary reinforcement grating 321 on the second light-shielding plate 32 is set to correspond to the first light-transmitting area 3112. Figure 3 and Figure 6As shown, the background light 211 emitted by the background light source 21 illuminates the material observation position through the background light transmission area 3111, and continues to pass through the first light transmission area 3112 and the secondary enhancement grating 321 before reaching the camera 1. The light enters the camera 1 along the light path defined by the first light shield 31 and the second light shield 32, thereby blocking other light rays, eliminating interference with the camera 1, and further improving the accuracy of the image information acquired by the camera 1.

[0065] When the second light-shielding plate 32 is set to correspond to the illumination grating 312, the first light-shielding plate 31, the second light-shielding plate 32, and the camera 1 are set on the same side. The second light-shielding plate 32 is located between the first light-shielding plate 31 and the camera 1. The secondary reinforcement grating 321 on the second light-shielding plate 32 is set to correspond to the second light-transmitting area 3122. The illumination light 221 emitted by the illumination light source 22 illuminates the material observation position through the illumination light-transmitting area 3121. After being reflected by the material 200, it passes through the second light-transmitting area 3122 and the secondary reinforcement grating 321 in sequence and is directed to the camera 1. The camera 1 collects clear image information of the material 200.

[0066] In some embodiments of this utility model, such as Figure 2 and Figure 4 As shown, the light-shielding plate 3 is an opaque rigid plate, and the background grating 311 and / or the illumination grating 312 are light-transmitting areas 3a on the rigid plate.

[0067] The light-shielding plate 3 is an opaque, rigid plate that blocks light. It has a light-transmitting area 3a through which light can pass. This light-transmitting area 3a is constructed as a background grating 311 and / or an illumination grating 312. Thus, the light-shielding plate 3 not only has a light-transmitting area 3a through which light can pass, but also a light-blocking area 3b to prevent light from passing through, thereby processing most light paths and blocking interfering stray light.

[0068] In some other embodiments of the present invention, the light-shielding plate 3 includes a transparent plate and a light-shielding layer disposed on the transparent plate, the light-shielding layer being disposed away from the light-transmitting area 3a formed by the background grating and / or the illumination grating.

[0069] A transparent panel allows light to pass through, while a light-blocking layer is placed on the transparent panel to block the light. Thus, the light-transmitting panel has a transparent area that allows light to pass through, and also a light-blocking layer that blocks the light from passing through.

[0070] In some embodiments of this invention, the material image acquisition system 100 is applied to a color sorter. The color sorter includes a sorting box, and the glass plate of the sorting box is constructed as a transparent plate of a light-shielding plate 3. A light-absorbing material is applied to the surface of the glass plate in the thickness direction to form the light-shielding plate 3, thereby processing the light path and blocking interfering stray light. By utilizing the transparent plate of the sorting box as a light-shielding plate 3, the space occupied by the material image acquisition system 100 can be further reduced.

[0071] In some embodiments of this utility model, such as Figure 7 As shown, there are two sets of cameras 1, located on both sides of the material passage area S; one set of cameras 1 is a transmission camera 11 used to acquire a transmission image of the material observation position; the other set of cameras 1 is a reflection camera 12 used to acquire a reflection image of the material observation position; in the material image acquisition system 100, multiple light sources 2 are provided on the same side of the reflection camera 12 to serve as at least two illumination light sources 22 and at least one background light source 21; there are two first light-shielding plates 31, located on both sides of the material passage area S; the light from the background light source 21 passes through the background light transmission area 3111 and illuminates the material 200, and the transmission camera 11 acquires the projected image of the material 200 through the first light transmission area 3112.

[0072] There are two sets of cameras 1. Each set of cameras 1 can consist of one or more cameras. The two sets of cameras 1 are placed on both sides of the material passage area S. One set of cameras 1 is a transmission camera 11, which can acquire transmission images and detect the internal structure or transparency of the material 200. The other set of cameras 1 is a reflection camera 12, which can acquire reflection images and detect the outer surface or contour of the material 200.

[0073] On the side of the material passage area S where the reflection camera 12 is installed, a plurality of light sources 2 are provided. The plurality of light sources 2 include at least two illumination light sources 22 and at least one background light source 21. By providing a plurality of illumination light sources 22, the material observation position can be illuminated from different angles. Illumination light 221 at different angles illuminates the material 200, so that the camera 1 can collect clear image information of the material 200.

[0074] At least two first light-shielding plates 31 are disposed on at least two sides of the material passage area S. The background light-transmitting area 3111 is disposed on the first light-shielding plate 31 on the side of the material passage area S closest to the background light source 21, and the first light-transmitting area 3112 is disposed on the first light-shielding plate 31 on the side of the material passage area S closest to the transmission camera 11. The background light 211 emitted by the background light source 21 illuminates the material observation position through the background light-transmitting area 3111 and continues to pass through the first light-transmitting area 3112 to the camera 1. The transmission camera 11 can capture the background light 211.

[0075] The first light shield 31, located on the side of the material passage area near the reflective camera 12, is provided with an illumination light transmission area 3121 and a second light transmission area 3122. The illumination light 221 emitted by the illumination light source 22 illuminates the material observation position through the illumination light transmission area 3121, and after being reflected by the material 200, it passes through the second light transmission area 3122 and shines on the reflective camera 12.

[0076] In some embodiments of this invention, on the side of the material passage area S where the reflective camera 12 is located, a plurality of light sources 2 are provided to serve as at least two illumination light sources 22 and at least one transmission light source. A background light transmission area 3111 is provided on the first light shield 31 on one side of the reflective camera 12. The background light 211 emitted by the background light source 21 illuminates the material observation position through the background light transmission area 3111 and continues to be directed to the transmission camera 11 through the first light transmission area 3112 on the first light shield 31 on one side of the transmission camera 11, thereby providing a transmission image to the transmission camera 11.

[0077] In some embodiments of this utility model, such as Figure 5 As shown, there are two sets of cameras 1, which are located on both sides of the material passage area S. Each camera 1 has an illumination light source 22 set on both sides of its optical axis, and the two cameras 1 on the same side share an illumination light source 22 in the middle of them.

[0078] Each camera group 1 includes a reflection camera 12 and a transmission camera 11. The reflection camera 12 is used to acquire the reflection image of the material observation position, and the transmission camera 11 is used to acquire the transmission image of the material observation position.

[0079] Among them, the reflective camera 12 of the two sets of cameras 1 can be set on one side of the material passage area S, and the transmissive camera 11 of the two sets of cameras 1 can be set on the other side of the material passage area S; or, it can be as follows: Figure 5 As shown, one set of reflective cameras 12 and another set of transmissive cameras 11 are arranged on the same side, and one set of transmissive cameras 11 and another set of reflective cameras 12 are arranged on the same side.

[0080] Each camera 1 has an illumination light source 22 on both sides of its optical axis. Two cameras 1 on the same side share one illumination light source 22, which can improve the illumination light and enhance image clarity.

[0081] In some embodiments of this application, there are three light sources 2, which can illuminate the material observation position from different angles, so that the camera 1 can collect clear image information of the material 200.

[0082] Background light source 21 is provided on the opposite sides of the two sets of cameras 1. Correspondingly, transmission camera 11 is provided on the opposite sides of the material passage area S, which can increase the sampling range of camera 1 and improve the image acquisition effect of material image acquisition system 100.

[0083] In some embodiments of this utility model, such as Figure 5As shown, at least two cameras 1 are arranged on the same side of the material passage area S. The at least two cameras 1 are staggered along a direction perpendicular to the extension direction of the material passage area S, so as to acquire images of half of the surface of the material 200, thereby improving the image acquisition effect of the material image acquisition system 100.

[0084] The following is a reference appendix. Figure 3 This invention describes the structure and operation of a material image acquisition system 100 according to a specific embodiment of the present invention. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the present invention.

[0085] The material collection system 100 has a material baffle 101 that defines a material passage area S. The material collection system 100 includes a camera 1, a light source 2, and a light shield 3. There are two cameras 1, which are respectively located on both sides of the material passage area S. There are two light sources 2, both located on the same side of the material passage area S. One of the light sources 2 is a background light source 21, which provides background light 211 to the camera 1 located on the other side of the material passage area S opposite to the background light source 21. When the other light source 2 is an illumination light source 22, the illumination light source 22 provides illumination light 221 to the camera 1 located on the same side of the material passage area S opposite to the illumination light source 22.

[0086] The light-shielding plate 3 includes two first light-shielding plates 31, which are respectively placed on both sides of the material passage area S. The first light-shielding plates 31 are positioned between the material passage area S and the camera 1 on the corresponding side. A first light-transmitting area 3112 is provided on the first light-shielding plate 31 on the side opposite to the light source 2, and a background light-transmitting area 3111, an illumination light-transmitting area 3121, and a second light-transmitting area 3122 are provided on the first light-shielding plate 31 on the same side as the light source 2. The background light-transmitting area 3111 and the illumination light-transmitting area 3121 are connected.

[0087] The light shield 3 also includes a second light shield 32, which is disposed on different sides of the material passage area S and the light source 2. A secondary reinforcement grating 321 is provided on the second light shield 32, which is disposed relative to the first light passage area 3112.

[0088] Background light 211 emitted by background light source 21 illuminates the material observation position through background light transmission area 3111, and continues to pass through first light transmission area 3112 and secondary reinforcement grating 321 in sequence before being directed to camera 1. Camera 1 can capture the background light 211.

[0089] The illumination light 221 emitted by the illumination source 22 illuminates the material observation position through the illumination light transmission area 3121. After being reflected by the material 200, it passes through the second light transmission area 3122 and is directed towards the camera 1, where the camera 1 collects clear image information of the material 200. Other illumination light 221 emitted by the illumination source 22, as indicated by the dotted line in the attached figure (which represents blocked illumination light 222), is blocked by the light-blocking area 3b on the light-blocking plate 3 and cannot reach the camera 1, thereby reducing stray light and improving the accuracy of the image information from the camera 1.

[0090] A color sorter according to a second aspect of the present invention includes a material image acquisition system 100 according to a first aspect of the present invention.

[0091] According to some embodiments of the present invention, the color sorter, by setting the material image acquisition system 100 of the first aspect embodiment of the present invention, occupies less space, is easy to install, and is conducive to the miniaturization of the color sorter.

[0092] The quality analyzer according to a third aspect of the present invention includes a material image acquisition system 100 according to a first aspect of the present invention.

[0093] According to the quality analysis of some embodiments of the present invention, by setting up the material image acquisition system 100 of the first aspect embodiment of the present invention, the material image acquisition system 100 occupies less space, is easy to install, and is conducive to the miniaturization of the quality analyzer.

[0094] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A material image acquisition system, wherein the material image acquisition system has a material passage area, characterized in that, include: At least one camera; A light source is provided for illuminating the material in the material passage area. At least one of the light sources is located on both sides of the material passage area with the camera to serve as a background light source, and / or at least one of the light sources is located on the same side of the material passage area with the camera to serve as an illumination light source. A light-shielding plate, the light-shielding plate including a first light-shielding plate located between the camera and the material passage area, the first light-shielding plate being provided with a background grating corresponding to the background light source and / or an illumination grating corresponding to the illumination light source; The background grating includes: a background light-transmitting area for allowing the background light source to illuminate the material observation position, and a first light-transmitting area located between the camera and the material observation position. The background light-transmitting area is located on a first light-shielding plate on the same side as the background light source, and the first light-transmitting area is located on a first light-shielding plate on the same side as the camera on which the background light source projects. The illumination grating includes: an illumination light-transmitting area for allowing the illumination light source to illuminate the material observation position, and a second light-transmitting area located between the camera and the material observation position.

2. The material image acquisition system of claim 1, wherein, The same camera is provided with at least two light source elements that serve as the illumination light source, so as to illuminate the material observation position from different angles; The first light-shielding plate is provided with an illumination light-transmitting area corresponding to the illumination light source.

3. The material image acquisition system of claim 1, wherein, The light-shielding plate also includes: A second light-shielding plate is located between the first light-shielding plate and the camera. The second light-shielding plate is provided with a secondary reinforcement grating, which is set to correspond to the background grating and / or the illumination grating.

4. The material image acquisition system of claim 1, wherein, The light-shielding plate is an opaque rigid plate, and the background grating and / or the illumination grating are light-transmitting areas on the rigid plate.

5. The material image acquisition system of claim 1, wherein, The light-shielding plate includes: Transparent panel; A light-shielding layer is provided on the transparent plate, the light-shielding layer being arranged to avoid the background grating and / or the illumination grating.

6. The material image acquisition system according to any one of claims 1 to 5, characterized in that, The camera consists of two sets, which are located on both sides of the material passage area. One set of the cameras is a transmission camera used to acquire transmission images of the material observation location; The other set of cameras is a reflective camera used to acquire reflected images of the material observation location; In the material image acquisition system, on the same side of the reflective camera, a plurality of light sources are provided to serve as at least two illumination light sources and at least one background light source. There are two first light-shielding plates, located on both sides of the material passage area; The light from the background light source passes through the background light transmission area and illuminates the material, and the transmission camera acquires the projected image of the material through the first light transmission area.

7. The material image acquisition system according to any one of claims 1 to 5, characterized in that, The camera consists of two sets, which are located on both sides of the material passage area. Each camera has an illumination source on each side of its optical axis, and two cameras on the same side share an illumination source between them.

8. The material image acquisition system according to any one of claims 1-5, characterized in that, At least two of the cameras are provided on the same side of the material passage area; At least two of the cameras are staggered along a direction perpendicular to the extension direction of the material passage area.

9. A color sorter characterized by comprising: A material image acquisition system comprising the material image acquisition system according to any one of claims 1-8.

10. A quality analyser characterised in that, A material image acquisition system comprising the material image acquisition system according to any one of claims 1-8.

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