Illuminating device for low-light imaging system

Abstract

The invention belongs to the technical field of image processing, and particularly relates to a lighting device for a low-light imaging system, which comprises a light sensor, a control module, an annular LED lamp panel, a first main lamp bead ring, a second main lamp bead ring and an auxiliary lamp bead ring, the control module divides the first main lamp bead ring, the second main lamp bead ring and the auxiliary lamp bead ring into three areas for independent control according to the sensing result of the light sensor, and dynamic adjustment of light is achieved. A first collecting lens, a second collecting lens and a third collecting lens are sequentially and correspondingly arranged in front of the main lamp beads contained in the first main lamp bead ring and the second main lamp bead ring respectively. A fourth collecting lens is arranged in front of the first main lamp bead ring, the second main lamp bead ring and the auxiliary lamp bead ring, and the fourth collecting lens mixes light rays emitted by the main lamp beads and then emits the mixed light rays. According to the invention, the image detection accuracy of the image sensor in a weak light environment can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of image processing, and in particular relates to an illumination device for a low-light imaging system. Background Art

[0002] Traditional machine vision illumination light sources are composed of uniformly linearly arranged lamp beads, and light intensity attenuation is likely to occur in the edge area of the imaging field of view, resulting in the light spot uniformity of the light source being lower than 85%, which affects the imaging quality in low-light environments. In recent years, with the continuous development of low-light imaging technology, the performance level of image sensors has become crucial. Selecting an image sensor with excellent performance can improve the sensitivity of the image sensor and effectively enhance the imaging quality in low-light environments.

[0003] Currently, in a low-light environment, only a small amount of natural light exists, which brings great difficulties to the recognition and detection of low-light imaging, directly affecting the image quality of low-light imaging. For example, the image visibility is poor, the image brightness is low, and image details are missing, making it impossible for low-light imaging to accurately and truly reflect the detection environment. With the increasing demand for imaging in low-light environments and the continuous development of low-light imaging technology, it is crucial to improve the illumination brightness of the low-light imaging environment. Histogram equalization algorithms in image processing algorithms in the low-light field have a good enhancement effect on environments with overall brightness being too dark or too bright, but they cannot ensure that the detail information and brightness of the image are enhanced simultaneously. Gamma correction algorithms increase the contrast between the high and low frequency parts of the image by adjusting the ratio, but are prone to over-enhancement and under-enhancement phenomena. Wavelet transform algorithms can highlight image details at different scales, but cannot ensure reducing the algorithm complexity while reducing noise, restricting the transplantation to the lower computer. Summary of the Invention

[0004] In view of this, the present invention aims to provide an illumination device for a low-light imaging system to solve problems such as low brightness and poor image quality of the detected image by the image sensor in a low-light environment, and the problem that in the low-light imaging field, due to the relatively dark illumination environment, the overall image is often too dark to see the real environment. The present invention can improve the detection illumination environment, improve the imaging quality of the image sensor, make the image sensor more accurate and reliable in applications such as recognition and monitoring, and can improve the accuracy and authenticity of image detection by the image sensor in a low-light environment.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows: An illumination device for a low-light imaging system, comprising a light sensor, a control module, an annular LED light board, and a first main bead ring, a second main bead ring, and an auxiliary bead ring arranged on the annular LED light board. The first main bead ring, the second main bead ring, and the auxiliary bead ring are arranged in concentric circles. The light sensor sends the sensing result of the ambient light to the control module, and the control module independently controls the first main bead ring, the second main bead ring, and the auxiliary bead ring in three zones according to the sensing result to achieve dynamic adjustment of the light; In front of the main beads included in each of the first main bead ring and the second main bead ring, a first condenser lens, a second condenser lens, and a third condenser lens are sequentially arranged; in front of the first main bead ring, the second main bead ring, and the auxiliary bead ring, a fourth condenser lens is provided, and the fourth condenser lens mixes and emits the light emitted by each main bead through the corresponding third condenser lens and the light emitted by the auxiliary bead ring; The first condenser lens, the second condenser lens, the third condenser lens, and the fourth condenser lens arranged in front of each main bead are all arranged on a lens mounting bracket. The lens mounting bracket is threadedly connected to the annular LED light board, and the distance between each main bead and the corresponding first condenser lens is adjusted by the thread to change the light angle of the light emitted by each main bead through the corresponding third condenser lens.

[0006] Further, the light emitted by the first main bead ring and the second main bead ring is white light; the light emitted by the auxiliary bead ring is all warm light.

[0007] Further, the first main bead ring is the central area, the second main bead ring is the transition area, and the auxiliary bead group is the edge area.

[0008] Further, all the main beads included in the first main bead ring and the second main bead ring and all the auxiliary beads included in the auxiliary bead ring are LED beads.

[0009] Further, the material of the annular LED light board is an aluminum substrate, and a radial fin heat sink is provided on the outer shell of the annular LED light board.

[0010] Further, the connection between the low-light imaging system and the annular LED light board is coated with a heat-conducting silica gel pad.

[0011] Further, a dual-band filter is coated on the surface of each auxiliary bead included in the auxiliary bead ring, and a PMMA lens is provided in front of each auxiliary bead.

[0012] Further, the distance between each main bead included in the first main bead ring is not less than 15 mm, and the distance between each main bead included in the second main bead ring is not less than 20 mm.

[0013] Compared with the prior art, the present invention can achieve the following beneficial effects: (1)The lighting device for a low-light imaging system according to the present invention can improve the brightness of a low-light environment and enable the low-light imaging system to perform high-frame-rate imaging under the premise of a low exposure time in a weak light environment.

[0014] (2)The lighting device for a low-light imaging system according to the present invention can support dynamic zonal dimming according to the lighting conditions of the low-light environment, and based on the light effect compensation technology, enable the lighting device to adapt to different lighting environments and improve the low-light imaging effect.

[0015] (3)The lighting device for a low-light imaging system according to the present invention, in the application scenario of a low-light environment, makes the selection of the image sensor not limited by performance such as sensitivity and signal-to-noise ratio, reduces costs, and has high portability.

[0016] (4)The lighting device for a low-light imaging system according to the present invention strengthens the heat dissipation structure, can extend the service life of the lighting device, and improves reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and shall not unduly limit the present invention. In the drawings: Figure 1 is a schematic structural diagram of the lighting device for a low-light imaging system according to an embodiment of the present invention; Figure 2 is a schematic layout structure diagram of the lamp beads of the annular LED lamp board according to an embodiment of the present invention; Figure 3 is a schematic flow diagram of the lighting method of the lighting device for a low-light imaging system according to an embodiment of the present invention.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS: 1, low-light imaging system; 2, lens; 3, annular LED lamp board; 4, auxiliary lamp bead ring; 5, second main lamp bead ring; 6, first main lamp bead ring; 7, fourth condenser; 4-1, first auxiliary lamp bead; 4-2, second auxiliary lamp bead; 4-3, third auxiliary lamp bead; 4-4, fourth auxiliary lamp bead; 5-1, first main lamp bead; 5-2, second main lamp bead; 5-3, third main lamp bead; 5-4, fourth main lamp bead; 5-5, fifth main lamp bead; 5-6, sixth main lamp bead; 6-1, seventh main lamp bead; 6-2, eighth main lamp bead; 6-3, ninth main lamp bead; 6-4, tenth main lamp bead; 6-5, eleventh main lamp bead; 6-6, twelfth main lamp bead. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation to the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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, so it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] As Figure 1 shown, the present invention provides an illumination device for a low-light imaging system 1, including a light sensor, a control module, a circular LED lamp board 3, and a first main lamp bead ring 6, a second main lamp bead ring 5, and an auxiliary lamp bead ring 4 arranged on the circular LED lamp board 3. The first main lamp bead ring 6, the second main lamp bead ring 5, and the auxiliary lamp bead ring 4 are arranged concentrically. The light sensor sends the sensing result of the ambient light to the control module, and the control module divides the first main lamp bead ring 6, the second main lamp bead ring 5, and the auxiliary lamp bead ring 4 into three areas for independent control according to the sensing result, realizing the dynamic adjustment of the light.

[0025] In front of each main light-emitting diode (LED) in the first main LED ring 6 and the second main LED ring 5, a first condenser lens, a second condenser lens, and a third condenser lens are sequentially arranged. The first condenser lens, the second condenser lens, and the third condenser lens are all aspherical lenses. The combination of the first condenser lens, the second condenser lens, and the third condenser lens is used to gradually reduce the light divergence angle to form a nearly parallel light beam. In front of the first main LED ring 6, the second main LED ring 5, and the auxiliary LED ring 4, a fourth condenser lens 7 is provided. The fourth condenser lens 7 is an aspherical lens, which is used for light condensation and ensuring the uniformity of the finally output light. The fourth condenser lens 7 mixes the light emitted from each main LED through the corresponding third condenser lens and the light emitted from the auxiliary LED ring 4 and then outputs it.

[0026] The first condenser lens, the second condenser lens, the third condenser lens, and the fourth condenser lens 7 arranged in front of each main LED are all arranged on a lens mounting bracket. The lens mounting bracket is threadedly connected to the annular LED lamp board 3, and the distance between each main LED and the corresponding first condenser lens is adjusted by the thread to change the light angle of the light emitted from each main LED through the corresponding third condenser lens.

[0027] It should be noted that, as Figure 2 shown, the present invention provides illumination for the low-light imaging system 1 through the illumination device, and the present invention can assist the low-light imaging system 1 to perform high-quality imaging in a low-light environment. Taking the example that there are 16 LED lamp beads on the annular LED lamp board 3, the 16 lamp beads are adjusted to 12 main lamp beads (white light) + 4 auxiliary lamp beads (warm light, specifically the first auxiliary lamp bead 4-1, the second auxiliary lamp bead 4-2, the third auxiliary lamp bead 4-3, and the fourth auxiliary lamp bead 4-4). Each main lamp bead is arranged in an annular gradient (6 in the inner ring, specifically: the seventh main lamp bead 6-1, the eighth main lamp bead 6-2, the ninth main lamp bead 6-3, the tenth main lamp bead 6-4, the eleventh main lamp bead 6-5, the twelfth main lamp bead 6-6; 6 in the outer ring, specifically: the first main lamp bead 5-1, the second main lamp bead 5-2, the third main lamp bead 5-3, the fourth main lamp bead 5-4, the fifth main lamp bead 5-5, the sixth main lamp bead 5-6). The auxiliary lamp beads are distributed at the four corners to form a light effect with light and dark levels, breaking through the traditional uniform arrangement mode. The present invention divides the 16 LED lamp beads into 3 independent control areas (4 in the central area, 8 in the transition area, and 4 in the edge area), so as to support single-area brightness compensation. Three-stage condenser lenses are arranged in front of each main lamp bead, and the distance between the lens and the lamp bead is adjusted by a threaded adjustment structure to change the light beam angle. According to the use distance, the light is condensed into a nearly parallel light beam through the three-stage condenser lenses, and all the light beams are mixed by the fourth condenser lens 7 and then output to form a high-brightness and low-divergence light. A dual-band filter is covered on the surface of each auxiliary lamp bead to eliminate the color temperature difference of the light spots.

[0028] The present invention integrates an optical sensor (for detecting the ambient light intensity) and a control module to achieve dynamic adjustment of light, improve the adaptability of low-light imaging, enable the low-light imaging system 1 to detect detailed image information completely and truly in a low-light environment, and also achieve high-quality imaging under real-time monitoring at a high frame rate. The lighting device for the low-light imaging system 1 is arranged in front of the low-light detector, selects partitions according to the environment to achieve dynamic dimming, and enables the low-light detector to perform high-quality imaging in a low-light environment.

[0029] Specifically: The sensing results of the ambient light in the central area, transition area, and edge area by the optical sensor are sent to the control module. Here, the optical sensor uses the GMAX3809 image sensor produced by Changguang Sensen. The minimum operating illuminance of the GMAX3809 image sensor is 0.05 Lux. Therefore, the minimum illuminance value of the central area field of view is 0.05 Lux, and the illuminance value of the central field of view is set according to application requirements (but should be greater than the minimum operating illuminance of the image sensor). The transition area (the second main lamp bead ring 5) is compensated to 70% - 85% of the central illuminance, and the edge area (the auxiliary lamp bead ring 4) is compensated to 50% - 60% of the central illuminance, which is used to compensate for color temperature and eliminate vignetting. The control module calculates the target brightness of each lamp bead ring (central area, transition area, edge area) based on the ambient light value feedback by the optical sensor and outputs the corresponding PWM duty cycle to achieve dynamic adjustment of light. The first main lamp bead ring 6, the second main lamp bead ring 5, and the auxiliary lamp bead ring 4 are independently controlled according to user needs.

[0030] In addition, the present invention also designs an annular LED lamp board 3 made of aluminum substrate according to the size of the detection lens 2 of the low-light imaging system 1. On the one hand, the structural design of the annular LED lamp board 3 solves the problem of the influence on the imaging effect caused by the entrance pupil of the illumination optical path; on the other hand, radial heat dissipation fins are added on the back of the aluminum substrate, and a high-efficiency heat dissipation channel is formed in cooperation with the thermal conductive silicone pad to improve the heat conduction efficiency and the overall heat dissipation efficiency, which can well solve the problems of high power consumption and heat dissipation during long-term operation of the lighting system.

[0031] In some embodiments, the light emitted by the first main lamp bead ring 6 and the second main lamp bead ring 5 is white light; the light emitted by the auxiliary lamp bead ring 4 is warm light.

[0032] In some embodiments, all the main lamp beads included in the first main lamp bead ring 6 and the second main lamp bead ring 5 and all the auxiliary lamp beads included in the auxiliary lamp bead ring 4 are LED lamp beads.

[0033] It should be noted that in the selection of the LED driving power supply: The LED driving power supply XS3601 is selected to supply power to each LED lamp bead. The input of the LED driving power supply is provided by the power supply terminal of the low-light imaging system 1. The low-light imaging system 1 and the lighting device are connected through a connector plug. It is necessary to consider whether the input voltage of the LED driving power supply matches the front-stage DC, and whether the output voltage of the LED driving power supply matches the rear-stage LED lamp beads. The rear-stage LED lamp beads refer to all LED lamp beads.

[0034] In the selection of LED lamp beads, it is necessary to consider whether the output current of the LED lamp beads is stable: The main lamp beads are selected as white light, specifically the light-emitting diodes with COB integrated packaging, which reduces the distance between the light-emitting points and realizes a light efficiency utilization rate of more than 95%. The auxiliary lamp beads of the present invention are selected as warm-color light-emitting diodes, with a forward current of 350 mA and a power consumption of 1.225 W.

[0035] In the design of the drive circuit, it is necessary to control the high and low levels of the enable pin by the lower computer software. Specifically: The OVP pin is used as the overvoltage protection pin, and the typical value of the overvoltage protection point is set to 1.2 V. VOVP = 1.2×(1 + R5 / R4), where VOVP is the maximum voltage difference for the drive power supply to supply power to the load lamp beads; both R5 and R4 are adjustment resistors. By changing the value of R5 / R4, the maximum voltage difference output by the drive power supply is determined, and the more the load lamp beads, the greater the voltage difference. Here, it is necessary to match the values of resistor R4 and resistor R5 according to the number of LED lamp beads. EN is the enable control pin of the lamp bead drive circuit, and EN is connected to the processor control pin of the low-light imaging system 1 to control the opening and closing of the drive circuit.

[0036] The current sampling resistors are selected through the following formula, and appropriate resistance values of sampling resistors R1 and R2 need to be selected for the output current of the LED lamp beads. Set the output current of the LED lamp beads : ; ; Among them, is the resistance value after the sampling resistors R1 and R2 are connected in parallel.

[0037] In some embodiments, the material of the annular LED lamp board 3 is an aluminum substrate, and radial fin heat sinks are provided on the outer shell of the annular LED lamp board 3.

[0038] In some embodiments, the connection between the low-light imaging system 1 and the annular LED lamp board 3 is coated with a thermally conductive silicone pad.

[0039] In some embodiments, double-band filters are covered on the surfaces of the respective auxiliary lamp beads included in the auxiliary lamp bead ring 4, and PMMA lenses are provided in front of the respective auxiliary lamp beads.

[0040] It should be noted that the model of the dual-band filter is Thorlabs FBH550-40.

[0041] In some embodiments, the spacing between the main lamp beads included in the first main lamp bead ring 6 is not less than 15 mm, and the spacing between the main lamp beads included in the second main lamp bead ring 5 is not less than 20 mm.

[0042] It should be noted that regarding the optimal design of the quantity and layout of LED lamp beads, an asymmetric gradient arrangement design is adopted. Specifically, 16 lamp beads are adjusted to 12 main lamp beads (white light) + 4 auxiliary lamp beads (warm light). The main lamp beads are arranged in a circular gradient (6 in the inner ring, that is, the first main lamp bead ring 6 has 6, and 6 in the outer ring, that is, the second main lamp bead ring 5 has 6). The auxiliary lamp beads are distributed at the four corners to form a light effect with light and dark levels, breaking through the traditional uniform arrangement mode.

[0043] The spacing of the main lamp beads is set to a gradient change of 15 - 20 mm (15 mm for the inner ring and 20 mm for the outer ring) to avoid light spot overlap and improve the illumination uniformity. Regarding the optimization of the installation position, the distance between the circular LED lamp board 3 and the target is controlled within 1 / 5 - 1 / 3 of the target height (for example, when the target height is 10 meters, the installation distance between the circular LED lamp board 3 and the target is 2 - 3 meters), and the light spot is accurately covered by adjusting the angle of the bracket. A multi-directional rotary fixator is adopted to support the adjustment of the lamp board's pitch angle by ±30°, adapting to the requirements of different inclined surfaces.

[0044] Regarding the collaborative design of dynamic control and heat dissipation, a form of zonal dynamic dimming is adopted. The lamp beads are divided into 3 independent control zones (4 in the central zone, 8 in the transition zone, and 4 in the edge zone). Through a PWM driving chip, stepless dimming from 0.1% to 100% is achieved, and single-zone brightness compensation is supported (such as increasing the brightness of the edge zone by 20% to eliminate dark corners).

[0045] Regarding the strengthening of the heat dissipation structure, radial fin heat sinks (height 8 mm, spacing 5 mm) are added to the back of the aluminum substrate (i.e., the housing of the circular LED lamp board 3), and together with a thermal conductive silicone pad (thickness 1.5 mm), an efficient heat dissipation channel is formed, and the temperature difference is controlled <10°C.

[0046] The light effect compensation technology of the present invention is as follows: Three-stage condenser lenses are arranged in front of the main lamp beads. By adjusting the distance between each condenser lens and the LED lamp bead through threads, the beam angle is changed to achieve continuous variability of the condensing angle, adapting to the requirements of different imaging distances. Based on the usage distance, the user condenses the light into a nearly parallel light beam, and all the nearly parallel light beams are mixed through the fourth condenser lens 7 and then output to form high-brightness and low-divergence light.

[0047] The surface of the auxiliary lamp beads of the present invention is covered with a dual-band filter (filtering the 500-600nm yellow light band), combined with a PMMA lens to diffuse the edge light, eliminating the color temperature difference of the light spot.

[0048] As Figure 3 shown, the specific working process of the lighting device of the present invention is as follows: The light sensor senses the ambient light in different areas (main lamp area, transition area, auxiliary lighting area), and feeds the ambient light value back to the processor of the low-light imaging system 1. The processor adjusts the brightness of the lamp beads in each area by outputting the PWM duty cycle according to the set main field of view light target value and the compensation ratio; When the light sensor senses a change in the ambient light, if the light value can meet the imaging quality in the current environment, the control is completed. If not, the adjustment continues to ensure that the low-light imaging system 1 can achieve high-quality imaging.

[0049] It should be understood that various forms of the processes shown above can be used, reordering, adding or deleting steps. For example, the steps described in the disclosure of the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and no limitations are imposed herein.

[0050] The above specific implementation manners do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An illumination device for a low-light imaging system, characterized in that: It includes a light sensor, a control module, an annular LED light board, a first main lamp bead ring, a second main lamp bead ring and an auxiliary lamp bead ring arranged on the annular LED light board. The first main lamp bead ring, the second main lamp bead ring and the auxiliary lamp bead ring are arranged in concentric circles. The light sensor sends the sensing result of the ambient light to the control module, and the control module divides the first main lamp bead ring, the second main lamp bead ring and the auxiliary lamp bead ring into three zones for independent control according to the sensing result, so as to realize the dynamic adjustment of the light. In front of the main lamp beads included in each of the first main lamp bead ring and the second main lamp bead ring, a first condenser lens, a second condenser lens and a third condenser lens are sequentially arranged; in front of the first main lamp bead ring, the second main lamp bead ring and the auxiliary lamp bead ring, a fourth condenser lens is provided, and the fourth condenser lens mixes the light emitted by each main lamp bead through the corresponding third condenser lens and the light emitted by the auxiliary lamp bead ring and then emits the mixed light. The first condenser lens, the second condenser lens, the third condenser lens and the fourth condenser lens arranged in front of each main lamp bead are all arranged on a lens mounting bracket. The lens mounting bracket is threadedly connected to the annular LED light board, and the distance between each main lamp bead and the corresponding first condenser lens is adjusted by the thread to change the light angle of the light emitted by each main lamp bead through the corresponding third condenser lens.

2. The illumination device for a low-light imaging system according to claim 1, characterized in that: The light emitted by the first main lamp bead ring and the second main lamp bead ring is white light; the light emitted by the auxiliary lamp bead ring is all warm light.

3. The lighting device for a low-light imaging system according to claim 1, wherein: The first main lamp bead ring is the central area, the second main lamp bead ring is the transition area, and the auxiliary lamp bead group is the edge area.

4. The lighting device for a low-light imaging system according to claim 1, characterized in that: All the main lamp beads included in the first main lamp bead ring and the second main lamp bead ring and all the auxiliary lamp beads included in the auxiliary lamp bead ring are LED lamp beads.

5. The lighting device for a low-light imaging system according to claim 1, wherein: The material of the annular LED light board is an aluminum substrate, and radial fin heat sinks are provided on the outer shell of the annular LED light board.

6. The illumination device for a low-light imaging system according to claim 1, characterized in that: The connection part between the low-light imaging system and the annular LED light board is coated with a thermal conductive silica gel pad.

7. The lighting device for a low-light imaging system according to claim 1, characterized in that: On the surface of each auxiliary lamp bead included in the auxiliary lamp bead ring, a dual-band filter is covered, and a PMMA lens is provided in front of each auxiliary lamp bead.

8. The illumination device for a low-light imaging system according to claim 1, characterized in that: The distance between each main lamp bead included in the first main lamp bead ring is not less than 15 mm, and the distance between each main lamp bead included in the second main lamp bead ring is not less than 20 mm.

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