A wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device

Abstract

This invention relates to the field of evidence recording technology and discloses a wide dynamic range anti-shake police-use color low-light night vision high-definition evidence collection device, aiming to address the shortcomings of existing technologies in terms of general color clarity reproduction of images under night vision conditions. This invention significantly improves image clarity, color reproduction, and dynamic range under nighttime and complex lighting conditions through a color low-light night vision imaging module; it also utilizes structures such as horizontal and vertical rails and rectangular sliders, along with passive damping components like elastic ropes, to construct a graded anti-shake system that passively absorbs high-frequency small-amplitude vibrations and actively compensates for low-frequency large-amplitude vibrations; combined with single triaxial accelerometer acquisition and auxiliary algorithms, it achieves omnidirectional precise suppression of vertical, horizontal, and diagonal vibrations, ensuring the spatial stability of the evidence recording device, improving the clarity of evidence recordings, and adapting to the characteristics of evidence collection environments.

Description

Technical Field

[0001] This invention relates to the field of evidence recording technology, and in particular to a wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device. Background Technology

[0002] Chinese Patent Publication No. CN221812406U discloses a high-definition night vision recorder, including a protective shell. A control motherboard is installed inside the protective shell. A multi-effect recording component is installed on the upper end of the control motherboard. A data processing component is installed on the control motherboard. Signal transmission components are soldered to the upper and lower ends of the control motherboard. An operation button is snapped onto the left side of the protective shell, and a safety adjustment component is fixed on the right side of the protective shell. The use of the multi-effect recording component improves the recording effect of the device in low-light environments such as at night.

[0003] Regarding the above-mentioned and existing related technologies, this application believes that the following defects often exist: Although the device uses a multi-camera structure to achieve high-definition image acquisition under night vision photography and video recording, the structure does not easily reproduce the colors in the night vision image, making the image content in the night vision state prone to overexposure due to the contrast between light and dark, affecting the image clarity. At the same time, since the device often moves with the user, the illumination clarity of the image will be adversely affected under the state of fluctuation. Therefore, there is room for improvement. Summary of the Invention

[0004] The technical problem to be solved by this invention is the general deficiency of the existing technology in the reproduction of color clarity of images under night vision conditions. To address this, we propose a wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device.

[0005] To achieve the above objectives, this application adopts the following technical solution: A wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device, comprising an evidence collection recorder body, a connection box disposed on the back of the evidence collection recorder body, a fixing clip fixed to the top of the back of the connection box, a color low-light night imaging module integrated inside the evidence collection recorder body, the color low-light night imaging module including a near-infrared color enhancement unit fixed inside the evidence collection recorder body, the near-infrared color enhancement unit being signal-connected to a CMOS sensor, the CMOS sensor being signal-connected to a wide dynamic range exposure control unit, the wide dynamic range exposure control unit being signal-connected to a low-light noise reduction fusion unit, the low-light noise reduction fusion unit being signal-connected to a color night vision enhancement unit, the wide dynamic range exposure control unit performing multi-frame long and short exposure alternating sampling and segmented grayscale mapping, its exposure control formula being: The low-light noise reduction and fusion unit performs sub-pixel-level registration and weighted fusion of the visible light channel image and the near-infrared channel image. The fusion formula is as follows: The color night vision enhancement unit performs low-light color compensation and dynamic range stretching on the fused image, and its processing formula is as follows: .

[0006] Preferably, the connection box has a groove on the side near the main body of the evidence recording device. A longitudinal rail is horizontally slidably installed inside the groove on the side near the main body of the evidence recording device, and a transverse rail is vertically slidably installed on the other side of the groove. The longitudinal and transverse rails are vertically distributed. Rectangular sliders are embedded inside the longitudinal and transverse rails. A connecting component is provided inside the rectangular slider on the side near the main body of the evidence recording device. The outer end of the connecting component is fixedly connected to the back of the main body of the evidence recording device. A voice coil motor A and a voice coil motor B are respectively installed on one side of the bottom and the center of the top of the connection box. An L-shaped guide block is fixed at the bottom of the longitudinal rail. A lead screw A is horizontally passed through the inside of the L-shaped guide block. One end of the lead screw A is connected to the output end of the voice coil motor A. A back guide block is fixed on the back of the transverse rail. A lead screw B is vertically passed through the center of the back guide block. The top end of the lead screw B is connected to the output end of the voice coil motor B. A three-axis accelerometer and a controller are installed inside the connection box.

[0007] Preferably, the connecting component includes a mounting groove formed on the outer end of the rectangular slider, a limiting groove formed at the bottom of the mounting groove, a T-shaped cylinder installed inside the mounting groove, the bottom end of the T-shaped cylinder inserted into the limiting groove, a flexible buffer ring sleeved on the outer end of the bottom end of the T-shaped cylinder, the outer end of the T-shaped cylinder being fixedly connected to the back of the evidence recording device body, and multiple sets of elastic pull ropes being evenly fixed on the inner wall of the mounting groove, with adjacent sets of elastic pull ropes crossing each other and wrapping around the outer wall of the T-shaped cylinder.

[0008] Preferably, the outer wall of the flexible buffer ring and the inner wall of the limiting groove are fitted together, and twelve sets of elastic pull ropes are provided, with multiple elastic pull ropes in each set. The multiple elastic pull ropes fill the gap between the T-shaped cylinder and the mounting groove.

[0009] Preferably, heat dissipation holes are provided on both sides of the connecting box. The distribution length of the heat dissipation holes is greater than the width of the transverse rail, and the distribution width of the heat dissipation holes is greater than the thickness of the transverse rail. The outer wall of the rectangular slider is respectively attached to the inner wall of the longitudinal rail and the transverse rail. Heat dissipation grooves are evenly provided on the outer wall of the rectangular slider. A linkage heat dissipation mechanism is provided at both ends of the longitudinal rail and the transverse rail. The linkage heat dissipation mechanism includes a rectangular frame fixed inside the groove. A toothed plate is fixed on one side inside the rectangular frame. The rectangular frame located on the longitudinal rail or the transverse rail is perpendicular to the corresponding longitudinal rail or transverse rail, and the rectangular frame is set through the longitudinal rail or the transverse rail. A fan is fixed on the side of the longitudinal rail or the transverse rail away from the heat dissipation groove. A gear is sleeved on the shaft of the fan. The gear and the toothed plate mesh with each other.

[0010] Preferably, the controller is electrically connected to a triaxial accelerometer, voice coil motor A, and voice coil motor B, respectively. The triaxial accelerometer is used to collect real-time vibration acceleration signals of the connecting box along the horizontal X-axis and vertical Z-axis. , The controller has a built-in signal preprocessing module, displacement calculation module, and graded vibration reduction decision module. The signal preprocessing module performs bandpass filtering on the acceleration signal to obtain the effective vibration acceleration: ,

[0011] The displacement calculation module performs a first integration on the filtered acceleration to obtain the vibration velocity and a second integration to obtain the swaying displacement. ,

[0012] ,

[0013] The graded vibration reduction decision module is based on the composite vibration amplitude. With threshold In comparison, when When the vibration is determined to be high-frequency and small-amplitude, voice coil motors A and B are kept stationary, and passive damping is achieved by the connecting assembly to absorb the vibration. It enters displacement compensation mode at that time.

[0014] Preferably, the controller has a built-in phase lead compensation module and a dual-axis linkage control module. The phase lead compensation module adjusts the phase lead compensation module according to the system delay. Lead correction for displacement: ,

[0015] The dual-axis linkage control module generates a reverse compensation control quantity based on the advance displacement: , .

[0016] Preferably, the dual-axis linkage control module is equipped with an oblique vibration calculation unit, which calculates the vibration direction angle. The system achieves dynamic gain allocation in the horizontal and vertical directions, while the controller adaptively adjusts the compensation gain based on the real-time vibration amplitude.

[0017] It achieves stable low-gain operation and rapid high-gain response, avoiding overshoot and attitude oscillation of the main body of the evidence recorder.

[0018] Preferably, the color low-light night imaging module includes a motion artifact suppression unit, which includes a frame buffer. The signal output of the frame buffer is connected to an inter-frame difference processor, and the signal output of the inter-frame difference processor is connected to an edge sharpening processor. The motion artifact suppression unit includes a stabilization signal synchronization interface, the signal input of which is connected to a displacement calculation module, and the signal output of which is connected to the inter-frame difference processor.

[0019] Preferably, the inter-frame difference operator performs sub-pixel alignment and inter-frame difference correction, and the correction formula is as follows: The edge sharpening processor identifies moving regions based on the difference results and performs adaptive ghosting removal and edge sharpening. Its sharpening intensity formula is: .

[0020] The technical effects and advantages of this invention are as follows: In this invention, a color low-light night vision imaging module with near-infrared color enhancement, wide dynamic range multi-frame exposure, sub-pixel fusion, low-light color compensation, and motion artifact suppression significantly improves image clarity, color reproduction, and dynamic range under nighttime and complex lighting conditions. Combined with structures such as horizontal rails, vertical rails, and rectangular sliders linked to dual voice coil motors, and a passive damping component consisting of elastic ropes and flexible buffer rings, a graded image stabilization system is constructed, passively absorbing high-frequency small-amplitude vibrations and actively compensating for low-frequency large-amplitude vibrations. Furthermore, by incorporating auxiliary algorithms such as single triaxial accelerometer acquisition and acceleration quadratic integral displacement calculation, vertical and horizontal movement within the vertical plane is achieved. It precisely suppresses oblique vibrations in all directions, effectively avoiding response lag and compensation overshoot, ensuring the stability of the main body of the evidence recorder in space, improving the clarity of evidence recording, and adapting to the characteristics of the evidence collection environment; relying on the follow-up heat dissipation mechanism composed of guide rail linkage gears, fans, heat dissipation slots, and heat dissipation holes, it dissipates frictional heat in real time, ensuring that the mechanical compensation action is continuously smooth and reliable. Ultimately, the device can achieve a comprehensive technical effect of mechanical anti-shake stability, high-definition low-light imaging, long-term reliable heat dissipation, and clear and shake-free evidence collection in complex scenarios such as law enforcement walking, running, and bumpy conditions, significantly improving the practicality, stability, and credibility of police evidence collection. Attached Figure Description

[0021] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the unit connection structure of the present invention; Figure 3 This is a three-dimensional schematic diagram of the groove distribution of the present invention; Figure 4 This is a three-dimensional schematic diagram of the triaxial accelerometer distribution of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the longitudinal and transverse rails of the present invention; Figure 6 This is a three-dimensional structural diagram of the linkage heat dissipation mechanism of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the connecting component of the present invention. Figure 8 This is a schematic diagram of the module connection structure of the present invention.

[0022] Legend: 1. Main body of the evidence recorder; 11. Color low-light imaging module; 111. Near-infrared color enhancement unit; 112. CMOS sensor; 113. Wide dynamic range exposure control unit; 114. Low-light noise reduction and fusion unit; 115. Color night vision enhancement unit; 116. Motion artifact suppression unit; 1161. Frame buffer; 1162. Inter-frame difference arithmetic unit; 1163. Edge sharpening processor; 1164. Anti-shake signal synchronization interface; 2. Connecting box; 21. Longitudinal rail; 211. L-shaped guide block; 212. Lead screw A; 213. Voice coil motor A; 22. Lateral rail; 221. Back guide block; 22 2. Lead screw B; 223. Voice coil motor B; 23. Heat dissipation hole; 24. Groove; 3. Fixing clamp; 4. Rectangular slider; 41. Heat dissipation slot; 5. Connecting assembly; 51. Mounting slot; 52. Limiting slot; 53. Elastic pull rope; 54. T-shaped cylinder; 55. Flexible buffer ring; 6. Linked heat dissipation mechanism; 61. Rectangular frame; 62. Toothed plate; 63. Fan; 64. Gear; 7. Triaxial accelerometer; 8. Controller; 81. Signal preprocessing module; 82. Displacement calculation module; 83. Graded vibration reduction decision module; 84. Phase lead compensation module; 85. Dual-axis linkage control module; 851. Oblique vibration calculation unit. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0024] Example 1: Refer to Figure 1 , Figure 2As shown, this invention provides a technical solution: a wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device, including an evidence collection recorder body 1. A connecting box 2 is provided on the back of the evidence collection recorder body 1. A fixing clip 3 is fixed to the top of the back of the connecting box 2. The fixing clip 3 includes, but is not limited to, spring clips, buckle clips, etc., all of which are common clip structures on the market. A color low-light night imaging module 11 is integrated inside the evidence collection recorder body 1. The color low-light night imaging module 11 includes a near-infrared color enhancement unit 111 fixed inside the evidence collection recorder body 1. The near-infrared color enhancement unit 111 is signal-connected to a CMOS sensor 112. The CMOS sensor 112 is signal-connected to a wide dynamic range exposure control unit 113. The wide dynamic range exposure control unit 113 is signal-connected to a low-light noise reduction fusion unit 114. The low-light noise reduction fusion unit 114 is signal-connected to a color night vision enhancement unit 115. The wide dynamic range exposure control unit 113 performs multi-frame long and short exposure alternating sampling and segmented grayscale mapping. Its exposure control formula is: Where α is the long exposure weighting coefficient, β is the short exposure weighting coefficient, EL is the long exposure amount, and ES is the short exposure amount; the low-light noise reduction fusion unit 114 performs sub-pixel level registration and weighted fusion of the visible light channel image and the near-infrared channel image, and its fusion formula is: Where ω1+ω2=1, Fvis is the visible light image, and Fnir is the near-infrared image; the color night vision enhancement unit 115 performs low-light color compensation and dynamic range stretching on the fused image, and its processing formula is as follows: , where k is the dynamic stretching coefficient and b is the brightness bias coefficient.

[0025] By utilizing the near-infrared color enhancement unit 111, CMOS sensor 112, wide dynamic range exposure control unit 113, low-light noise reduction fusion unit 114, and color night vision enhancement unit 115 working in concert, multi-frame wide dynamic range exposure adjustment, visible light and near-infrared sub-pixel level image fusion, low-light color compensation, and dynamic range stretching are completed. At the same time, data linkage is achieved through the motion artifact suppression unit 116 and the anti-shake signal synchronization interface 1164 of the displacement calculation module 82 to perform sub-pixel alignment, differential correction, and adaptive edge sharpening on inter-frame images, suppressing motion blur. This enables the evidence recording device 1 to output high-definition evidence images with wide dynamic range, low noise, true color, and no motion artifacts in low-light, night vision, and high contrast scenarios, significantly improving the imaging clarity and evidence reliability at night and in complex lighting environments.

[0026] like Figure 2As shown: The color low-light night imaging module 11 includes a motion artifact suppression unit 116, which includes a frame buffer 1161. The signal output terminal of the frame buffer 1161 is connected to the inter-frame difference arithmetic unit 1162, and the signal output terminal of the inter-frame difference arithmetic unit 1162 is connected to the edge sharpening processor 1163. The motion artifact suppression unit 116 includes a stabilization signal synchronization interface 1164, the signal input terminal of the stabilization signal synchronization interface 1164 is connected to the displacement calculation module 82, and the signal output terminal of the stabilization signal synchronization interface 1164 is connected to the inter-frame difference arithmetic unit 1162.

[0027] like Figure 2 As shown: The inter-frame difference arithmetic unit 1162 performs sub-pixel alignment and inter-frame difference correction, and its correction formula is as follows: , where ΔS x ΔS represents the X-axis anti-shake displacement. z F represents the Z-axis anti-shake displacement. t For the current frame image, F t-1 The previous frame image is used; the edge sharpening processor 1163 identifies the motion region based on the difference results and performs adaptive de-ghosting and edge sharpening, with the sharpening intensity formula as follows: Where G0 is the baseline sharpening factor, and ΔF max This is the maximum difference threshold.

[0028] Working principle: The near-infrared color enhancement unit 111 acquires and enhances the near-infrared light signal used for evidence illumination, and transmits it to the CMOS sensor 112 to complete photoelectric conversion and generate the original image signal; the wide dynamic range exposure control unit 113 performs multi-frame long and short exposure alternating sampling and segmented grayscale mapping, and achieves wide dynamic range brightness balance output according to the exposure control formula; the low-light noise reduction and fusion unit 114 performs sub-pixel level registration and weighted fusion of the visible light channel image and the near-infrared channel image to suppress noise and preserve image details; the color night vision enhancement unit 115 performs low-light noise reduction on the fused image. Illumination color compensation and dynamic range stretching enhance image brightness and color reproduction. The motion artifact suppression unit 116 obtains the anti-shake displacement data output by the displacement calculation module 82 through the anti-shake signal synchronization interface 1164. The inter-frame difference arithmetic unit 1162 combines the X-axis and Z-axis anti-shake displacement to perform sub-pixel alignment and inter-frame difference correction on the current frame and the previous frame image. The edge sharpening processor 1163 identifies the motion area based on the difference results and performs adaptive de-ghosting and edge sharpening processing, ultimately outputting a high-definition evidence image with wide dynamic range, clear low-light night vision, and no motion artifacts.

[0029] Example 2, based on Example 1, in order to improve the clarity of evidence collection, combined with the usage scenarios of the evidence collection device, improves the anti-shake effect on the main body 1 of the evidence collection recorder through active displacement compensation and material damping.

[0030] Reference Figures 3-5 , Figure 7 As shown, a groove 24 is provided on the side of the connection box 2 near the main body 1 of the evidence recording device. A longitudinal rail 21 is horizontally slidably installed inside the groove 24 on the side near the main body 1, and a transverse rail 22 is vertically slidably installed on the other side of the groove 24. The longitudinal rail 21 and the transverse rail 22 are vertically distributed. A rectangular slider 4 is embedded inside the longitudinal rail 21 and the transverse rail 22. A connecting component 5 is provided inside the rectangular slider 4 on the side near the main body 1 of the evidence recording device. The outer end of the connecting component 5 is fixedly connected to the back of the main body 1 of the evidence recording device. The bottom of the connection box 2... Voice coil motor A213 and voice coil motor B223 are respectively installed at the center of one side and the top. An L-shaped guide block 211 is fixed at the bottom of the longitudinal rail 21. A lead screw A212 is transversely passed through the interior of the L-shaped guide block 211. One end of the lead screw A212 is connected to the output end of the voice coil motor A213. A back guide block 221 is fixed on the back of the transverse rail 22. A lead screw B222 is longitudinally passed through the center of the back guide block 221. The top end of the lead screw B222 is connected to the output end of the voice coil motor B223. A triaxial accelerometer 7 and a controller 8 are installed inside the connecting box 2.

[0031] Reference Figure 7 As shown, the connecting component 5 includes a mounting groove 51 formed at the outer end of the rectangular slider 4. A limiting groove 52 is formed at the bottom end of the mounting groove 51. A T-shaped cylinder 54 is installed inside the mounting groove 51. The bottom end of the T-shaped cylinder 54 is inserted into the limiting groove 52. A flexible buffer ring 55 is sleeved on the outer end of the bottom end of the T-shaped cylinder 54. The outer end of the T-shaped cylinder 54 is fixedly connected to the back of the evidence recording device body 1. Multiple sets of elastic pull ropes 53 are evenly fixed on the inner wall of the mounting groove 51. Adjacent sets of elastic pull ropes 53 cross each other and wrap around the outer wall of the T-shaped cylinder 54.

[0032] Reference Figure 7 As shown, the outer wall of the flexible buffer ring 55 is in contact with the inner wall of the limiting groove 52. There are twelve sets of elastic pull ropes 53, and each set of elastic pull ropes 53 has multiple ropes. The multiple elastic pull ropes 53 fill the gap between the T-shaped cylinder 54 and the mounting groove 51.

[0033] By using multiple sets of elastic ropes 53, the T-shaped cylinder 54 can be effectively limited, and the deformation of the elastic ropes 53 under micro-vibration can absorb the vibration effect, thus achieving a mechanical automatic anti-shake function.

[0034] Working principle: The vibration signal of the connecting box 2 fixed to the officer's shoulder is detected by the triaxial accelerometer 7, and the vibration direction of the connecting box 2 in the vertical plane formed by X and Z is determined. The controller 8, in conjunction with the controller, determines the vibration displacement data of the connecting box 2. Under small-scale vibration, the flexible material deformation characteristics of the flexible buffer ring 55 and the elastic rope 53 are used to dampen and absorb the minor vibration. When the vibration is significant, the controller 8 dynamically controls the starting and rotation direction of the voice coil motors A213 and B223 to achieve the desired vibration. Lead screws A212 and B222 drive L-shaped guide block 211 and back guide block 221 to move laterally and longitudinally, respectively, causing longitudinal rail 21 and transverse rail 22 to move horizontally and vertically, respectively. Since both of them together limit and guide the rectangular slider 4, the position of the rectangular slider 4 is moved. According to the vibration direction of the connecting box 2, the rectangular slider 4 performs reverse displacement compensation, keeping the position of the evidence recording device body 1 relative to the police officer's shoulder still, thereby achieving the anti-shake effect and making the image emitted by the evidence recording device body 1 clearer and more stable.

[0035] Reference Figure 8 As shown, the controller 8 is electrically connected to the triaxial accelerometer 7, the voice coil motor A213, and the voice coil motor B223, respectively. The triaxial accelerometer 7 is used to collect the real-time vibration acceleration signals of the connecting box 2 along the horizontal X-axis and the vertical Z-axis. , The controller 8 has a built-in signal preprocessing module 81, a displacement calculation module 82, and a graded vibration reduction decision module 83. The signal preprocessing module 81 performs bandpass filtering on the acceleration signal to obtain the effective vibration acceleration. ,

[0036] The displacement calculation module 82 performs a first integration on the filtered acceleration to obtain the vibration velocity and a second integration to obtain the swaying displacement. ,

[0037] ,

[0038] The graded vibration reduction decision module 83 determines the vibration synthesis amplitude based on the vibration. With threshold In comparison, when When the vibration is determined to be high-frequency and small-amplitude, the voice coil motors A213 and B223 are kept stationary, and passive damping and vibration absorption are achieved by the connecting component 5. It enters displacement compensation mode at that time.

[0039] Reference Figure 8As shown, the controller 8 has a built-in phase lead compensation module 84 and a dual-axis linkage control module 85. The phase lead compensation module 84 adjusts the phase lead compensation module according to the system delay. Lead correction for displacement: , T d The inherent delays include the sampling delay of the triaxial accelerometer 7, the calculation delay of the controller 8, and the start-up and mechanical response delays of the voice coil motor A213 and the voice coil motor B223.

[0040] The dual-axis linkage control module 85 generates a reverse compensation control quantity based on the advance displacement: , K x K z These represent the real-time dynamic compensation gain in the horizontal and vertical directions, respectively, which are used to adjust the compensation intensity.

[0041] Reference Figure 8 As shown, the dual-axis linkage control module 85 is equipped with an oblique vibration calculation unit 851, which calculates the vibration direction angle. Dynamic gain distribution in the horizontal and vertical directions is achieved, that is, the displacement compensation rate of the longitudinal rail 21 and the horizontal rail 22 is proportionally adjusted according to the vibration tilt angle to achieve a smooth oblique compensation effect. At the same time, the controller 8 adaptively adjusts the compensation gain according to the real-time vibration amplitude.

[0042] Where K x0 K z0 These represent the reference gain (fixed preset value) in the horizontal and vertical directions, respectively, to achieve stable low gain for small amplitudes and rapid high gain for large amplitudes, avoiding overshoot and attitude oscillation of the main body 1 of the evidence recorder. That is, the more violent the vibration, the greater the gain, the faster the displacement compensation action, and the greater the fluctuation. Conversely, the position compensation action is smoother and more stable.

[0043] Working principle: The triaxial accelerometer 7 collects the vibration acceleration signals of the connecting box 2 in real time along the horizontal X-axis and vertical Z-axis, and transmits them to the controller 8; the signal preprocessing module 81 performs bandpass filtering on the acceleration signal to remove high-frequency noise and DC components to obtain the effective vibration acceleration; the displacement calculation module 82 performs a first integration on the effective acceleration to obtain the vibration velocity, and a second integration to obtain the real-time swaying displacement in the horizontal and vertical directions; the graded vibration reduction decision module 83 calculates the composite vibration amplitude and compares it with a preset threshold to complete the vibration graded judgment: when it is judged to be high-frequency small-amplitude vibration, the controller 8 controls the voice coil motors A213 and B223 to remain stationary, and the elastic rope 53 and flexible buffer ring 55 in the connecting component 5 achieve passive damping vibration absorption; when it is judged to be low-frequency large-amplitude swaying, it enters the active displacement compensation mode; the phase advance compensation module 84... The system's inherent delay is used to pre-correct the swaying displacement, offsetting the response time difference caused by the sampling of the three-axis accelerometer 7, the calculation of the controller 8, and the driving of the voice coil motors A213 and B223. The dual-axis linkage control module 85 calculates the vibration direction angle through the oblique vibration calculation unit 851, realizes the dynamic gain distribution in the horizontal and vertical directions, and adaptively adjusts the compensation gain according to the vibration amplitude to generate a reverse compensation control quantity opposite to the vibration direction. The controller 8 drives the voice coil motors A213 and B223 to operate according to the compensation control quantity, and drives the longitudinal rail 21 and the transverse rail 22 to move in linkage through the lead screws A212 and B222, so that the rectangular slider 4 generates a reverse compensation displacement along the cross guide rail, ensuring that the main body 1 of the evidence recorder remains stable in spatial posture, and achieving a high-definition stable shooting effect with graded vibration reduction, omnidirectional anti-shake, and no overshoot or oscillation.

[0044] Example 3: Based on Examples 1 and 2, the heat dissipation effect of the rectangular slider 4 is improved by cooperating with the linkage heat dissipation mechanism 6, thereby improving the smoothness of its active compensation displacement and further improving the anti-shake effect.

[0045] Reference Figures 3-6As shown, heat dissipation holes 23 are provided on both sides of the connecting box 2. The length of the heat dissipation holes 23 is greater than the width of the transverse rail 22, and the width of the heat dissipation holes 23 is greater than the thickness of the transverse rail 22. This prevents the longitudinal rail 21 and the transverse rail 22 from blocking the heat dissipation holes 23 and ensures that there are sufficient air inlet and outlet channels on both sides of the box 2. The outer side wall of the rectangular slider 4 is respectively attached to the inner wall of the longitudinal rail 21 and the transverse rail 22. Heat dissipation grooves 41 are evenly provided on the outer side wall of the rectangular slider 4. Heat dissipation grooves 41 are provided at both ends of the longitudinal rail 21 and the transverse rail 22. The linkage heat dissipation mechanism 6 includes a rectangular frame 61 fixed inside the groove 24. A toothed plate 62 is fixed on one side inside the rectangular frame 61. The rectangular frame 61 located on the longitudinal rail 21 or the transverse rail 22 is vertically distributed with the corresponding longitudinal rail 21 or transverse rail 22. The rectangular frame 61 is set through the longitudinal rail 21 or the transverse rail 22. A fan 63 is fixed on the side of the longitudinal rail 21 or the transverse rail 22 away from the heat dissipation groove 41. A gear 64 is sleeved on the shaft of the fan 63. The gear 64 and the toothed plate 62 mesh with each other.

[0046] Working principle: During the displacement compensation movement of the rectangular slider 4, it is accomplished by the lateral and longitudinal movement of the longitudinal rail 21 and the transverse rail 22. During this process, the side of the rectangular slider 4 needs to be subjected to continuous friction. The movement of the longitudinal rail 21 and the transverse rail 22 causes the fan 63 at the corresponding position to move synchronously. Since the gear 64 is always meshed with the adjacent tooth plate 62 during the movement, the fan 63 rotates. As a result, the airflow direction of the fan 63 is directly facing the heat dissipation groove 41 on the outer side of the rectangular slider 4, thereby promoting the airflow along the direction of the heat dissipation groove 41. This allows the frictional heat on the rectangular slider 4 to diffuse outward along the heat dissipation groove 41. Due to the increased airflow, the heat in the connecting box 2 is promoted to be exchanged internally and externally through the heat dissipation hole 23, thereby improving the heat dissipation effect.

[0047] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device, characterized in that, The device includes a main body for evidence collection and recording. A connection box is located on the back of the main body, and a fixing clip is fixed to the top of the back of the connection box. The main body integrates a color low-light night vision imaging module. This module includes a near-infrared color enhancement unit fixed inside the main body. The near-infrared color enhancement unit is signal-connected to a CMOS sensor. The CMOS sensor is signal-connected to a wide dynamic range exposure control unit. The wide dynamic range exposure control unit is signal-connected to a low-light noise reduction and fusion unit. The low-light noise reduction and fusion unit is signal-connected to a color night vision enhancement unit. The wide dynamic range exposure control unit performs multi-frame long and short exposure alternating sampling and segmented grayscale mapping. The low-light noise reduction and fusion unit performs sub-pixel level registration and weighted fusion of the visible light channel image and the near-infrared channel image. The color night vision enhancement unit performs low-light color compensation and dynamic range stretching on the fused image.

2. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 1, characterized in that: The connection box has a groove on one side near the main body of the evidence recording device. A longitudinal rail is horizontally slidably installed inside the groove on one side near the main body of the evidence recording device, and a transverse rail is vertically slidably installed on the other side of the groove. The longitudinal and transverse rails are vertically distributed. Rectangular sliders are embedded inside the longitudinal and transverse rails. A connecting component is located inside the rectangular slider on the side near the main body of the evidence recording device. The outer end of the connecting component is fixedly connected to the back of the evidence recording device. A voice coil motor A and a voice coil motor B are respectively installed on one side of the bottom and the center of the top of the connection box. An L-shaped guide block is fixed to the bottom of the longitudinal rail. A lead screw A is horizontally inserted through the interior of the L-shaped guide block. One end of the lead screw A is connected to the output end of the voice coil motor A. A back guide block is fixed to the back of the transverse rail. A lead screw B is vertically inserted through the center of the back guide block. The top end of the lead screw B is connected to the output end of the voice coil motor B. A three-axis accelerometer and a controller are installed inside the connection box.

3. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 2, characterized in that: The connecting assembly includes a mounting groove formed on the outer end of a rectangular slider. A limiting groove is formed at the bottom of the mounting groove. A T-shaped cylinder is installed inside the mounting groove. The bottom end of the T-shaped cylinder is inserted into the limiting groove. A flexible buffer ring is fitted on the outer end of the bottom end of the T-shaped cylinder. The outer end of the T-shaped cylinder is fixedly connected to the back of the evidence recording device body. Multiple sets of elastic pull ropes are evenly fixed to the inner wall of the mounting groove. Adjacent sets of elastic pull ropes cross each other and wrap around the outer wall of the T-shaped cylinder.

4. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 3, characterized in that: The outer wall of the flexible buffer ring fits into the inner wall of the limiting groove. There are twelve sets of elastic pull ropes, and each set of elastic pull ropes has multiple ropes. The multiple elastic pull ropes fill the gap between the T-shaped cylinder and the mounting groove.

5. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 2, characterized in that: The connecting box has heat dissipation holes on both sides. The length of the heat dissipation holes is greater than the width of the transverse rail, and the width of the heat dissipation holes is greater than the thickness of the transverse rail. The outer wall of the rectangular slider is respectively attached to the inner wall of the longitudinal rail and the transverse rail. The outer wall of the rectangular slider is uniformly provided with heat dissipation grooves. Both ends of the longitudinal rail and the transverse rail are provided with a linkage heat dissipation mechanism. The linkage heat dissipation mechanism includes a rectangular frame fixed inside the groove. A toothed plate is fixed on one side inside the rectangular frame. The rectangular frames located on the longitudinal rail or the transverse rail are perpendicular to the corresponding longitudinal rail or transverse rail, and the rectangular frames are set through the longitudinal rail or the transverse rail. A fan is fixed on the side of the longitudinal rail or the transverse rail away from the heat dissipation groove. A gear is sleeved on the shaft of the fan. The gear and the toothed plate mesh with each other.

6. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 2, characterized in that: The controller is electrically connected to a triaxial accelerometer, voice coil motor A, and voice coil motor B, respectively. The triaxial accelerometer is used to collect real-time vibration acceleration signals of the connecting box along the horizontal X-axis and vertical Z-axis. , The controller incorporates a signal preprocessing module, a displacement calculation module, and a graded vibration reduction decision module. The signal preprocessing module performs bandpass filtering on the acceleration signal. The displacement calculation module sequentially integrates the filtered acceleration once to obtain the vibration velocity and twice to obtain the swaying displacement. The graded vibration reduction decision module determines the vibration velocity based on the synthesized vibration amplitude. With threshold In comparison, when When the vibration is determined to be high-frequency and small-amplitude, voice coil motors A and B are kept stationary, and passive damping is achieved by the connecting assembly to absorb the vibration. It enters displacement compensation mode at that time.

7. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 6, characterized in that: The controller has a built-in phase lead compensation module and a dual-axis linkage control module. The phase lead compensation module adjusts the phase lead compensation based on the system delay. The displacement is corrected in advance, and the dual-axis linkage control module generates a reverse compensation control quantity based on the advance displacement.

8. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 7, characterized in that: The dual-axis linkage control module is equipped with an oblique vibration calculation unit, which calculates the vibration direction angle. It achieves dynamic gain allocation in the horizontal and vertical directions, and the controller adaptively adjusts the compensation gain according to the real-time vibration amplitude to avoid overshoot and attitude oscillation of the main body of the evidence recorder.

9. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 6, characterized in that: The color low-light night imaging module includes a motion artifact suppression unit, which includes a frame buffer. The signal output of the frame buffer is connected to an inter-frame difference operator, and the signal output of the inter-frame difference operator is connected to an edge sharpening processor. The motion artifact suppression unit also includes a stabilization signal synchronization interface. The signal input of the stabilization signal synchronization interface is connected to a displacement calculation module, and the signal output of the stabilization signal synchronization interface is connected to the inter-frame difference operator.

10. The wide dynamic range anti-shake police color low-light night vision high-definition evidence collection device according to claim 9, characterized in that: The inter-frame difference processor performs sub-pixel alignment and inter-frame difference correction, and the edge sharpening processor identifies motion regions based on the difference results and performs adaptive de-ghosting and edge sharpening.

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