A dual-mode multi-view vehicle bottom safety inspection device

Abstract

The utility model provides a kind of double-mode multi-view angle's vehicle bottom safety inspection device, comprising: fixedly installed in the central main module (1) of preset vehicle scanning area, the first camera (105) included in the main module (1) is perpendicular to the plane of target to be scanned, for capturing the panoramic image of vehicle chassis main body area;Additional module (2) is equipped on the both sides of the main module (1), the second camera (22) included in the additional module (2) forms preset angle with the plane of target to be scanned, for capturing vehicle chassis oblique view angle image.

Description

Technical Field

[0001] This utility model relates to a vehicle undercarriage safety inspection device, and more particularly to a dual-mode, multi-view vehicle undercarriage safety inspection device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, under-vehicle scanning is a crucial step in vehicle security inspection scenarios (such as entrances and exits of important locations, logistics parks, customs checkpoints, anti-terrorism and anti-explosive inspections, etc.) to detect whether the vehicle chassis is illegally carrying or concealing explosives, contraband, personnel, or other safety hazards.

[0004] Mainstream vehicle under-scanning technologies primarily employ imaging schemes based on a single camera and a single scanning modality (e.g., simple linear scanning or simple area scan). However, this traditional single-modality, single-view technology has significant and inherent limitations in practical applications, severely restricting the improvement of security inspection efficiency and accuracy. (1) The scanning mode is singular, making it difficult to balance efficiency and accuracy: Linear scanning typically provides high-resolution images, making it particularly suitable for capturing fine structures (such as weld points and pipeline details). However, its imaging speed is relatively slow, requiring vehicles to pass slowly and steadily over the scanning equipment or the equipment itself to move slowly to complete a full scan. This results in longer scan times per session, which can easily cause congestion during peak traffic periods.

[0005] Area Scan: It can perform fast single-frame capture, with a significant speed advantage. However, it is limited by sensor resolution and lens field of view. When acquiring a large-area (prepared or large vehicle) complete undercarriage image, the resolution is usually insufficient to cover the entire width, making it difficult to clearly present complex details of the undercarriage (such as the grooves of suspension components and tiny hidden objects in the gaps between pipes).

[0006] The fundamental contradiction is that existing single-modal solutions cannot simultaneously meet the demands for both "high precision" and "high speed." Security personnel often face a dilemma between efficiency and accuracy: pursuing speed may sacrifice the possibility of identifying minute dangerous items; ensuring clarity of details will inevitably slow down the passage process.

[0007] (2) Single-view imaging inevitably has blind spots: Because only a single camera is used, its field of view is fixed and limited. The undercarriage structure is complex and varied, with numerous three-dimensional concavities and convexities, suspension components (such as exhaust pipes, drive shafts, fuel tanks, longitudinal beams, etc.), and spaces inside the wheels.

[0008] These areas are prone to forming severe imaging blind spots. Items located in these blind spots (or severely obscured areas) will be directly missed by the camera or have insufficient imaging information, regardless of whether line scanning or area scanning is used, making them impossible to observe effectively.

[0009] Consequences: This blind spot problem directly leads to a significant increase in the risk of "false negatives"—that is, dangerous goods actually exist under the vehicle chassis, but pass through security checks due to incomplete imaging or failure to capture them at all. Simultaneously, misidentification of complex shadows or structures can also lead to "false positives"—that is, safe areas are incorrectly marked as potential threats, requiring manual verification or causing unnecessary traffic disruptions, similarly impacting efficiency.

[0010] In summary, the core challenge of current single-camera, single-modal vehicle undercarriage scanning technology lies in its inability to provide a high-precision, blind-spot-free panoramic image of the vehicle's undercarriage while ensuring rapid vehicle passage. The limited scanning modality and imaging perspective contribute to problems that urgently need to be addressed, including low passage efficiency, detection blind spots, and insufficient accuracy in identifying safety hazards (high rates of missed and false positives).

[0011] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0012] Purpose of the invention: The technical problem to be solved by this utility model is to provide a dual-mode, multi-view vehicle undercarriage safety inspection device to address the shortcomings of the existing technology.

[0013] To address the aforementioned technical problems, this utility model discloses a dual-mode, multi-view vehicle undercarriage safety inspection device, comprising: A main module is fixedly installed in the center of a preset vehicle scanning area. The first camera in the main module is perpendicular to the plane of the target to be scanned and is used to capture a panoramic image of the main area of ​​the vehicle chassis. The main module has additional modules on both sides. The second camera in the additional module forms a preset angle with the target plane to be scanned, and is used to capture the oblique view image of the vehicle chassis.

[0014] Furthermore, the main module includes: A main embedded box is fixedly installed in a preset position. A main panel is installed on the top of the main embedded box. A main camera hole is opened on the main panel for installing the first camera.

[0015] Furthermore, a main camera protective cover is installed on the main panel located outside the first camera.

[0016] Furthermore, on the main panel, main light holes are provided on both sides of the main camera hole for installing LED light groups.

[0017] Furthermore, an LED lamp protective cover is installed on the main panel outside the LED lamp group.

[0018] Furthermore, the main embedded box has through holes on its side for wiring.

[0019] Furthermore, the additional module includes: An additional embedded box is fixedly installed on the side of the main embedded box. A rigid bracket is installed on the top of the additional embedded box. The rigid bracket has a mounting surface that forms a preset angle with the plane of the target to be scanned, for mounting the second camera.

[0020] Furthermore, an additional lens cover is installed on the mounting surface of the rigid bracket, located outside the second camera.

[0021] Furthermore, the additional lens cover and the main camera cover are made of rigid material, with an optical path through hole in the middle.

[0022] Furthermore, the additional lens cover and the main camera cover are frustum-shaped, and the optical path through hole is set with an opening at a preset angle α*2, where α is the preset tilt angle for the installation of the second camera, and 10°<α<50°.

[0023] Beneficial effects

[0024] This invention enables dual-modal synergy and complementarity, perfectly balancing efficiency and accuracy. The central area scan maintains efficient passage, ensuring rapid imaging of the main scanning area; the front / rear line scans perform high-resolution, detailed scanning of key areas at the front and rear of the vehicle, compensating for the area scan's lack of detail resolution. A single passage simultaneously meets the dual rigid requirements of "fast passage" and "detailed inspection."

[0025] This invention eliminates scanning blind spots, greatly ensuring safety and reliability: by utilizing independent, pre-deployed oblique upward scanning angles at key locations at the front and rear of the vehicle, the system effectively covers imaging blind spots inherent in traditional single downward viewing angles (such as the inner grooves of various suspension components, wheel well areas, axle structure obstructions, and deep spaces under the front and rear bumpers). It fundamentally solves the risk of "false negatives," significantly improving the detection rate and reliability of concealed dangerous goods (explosives, contraband, and unauthorized personnel).

[0026] This invention significantly reduces the false positive rate, improving user experience and efficiency: the acquired multi-source, multi-view imaging data (overall + local details + specific blind areas) provides a richer and more comprehensive information foundation for the discrimination algorithm. Images from different modalities and perspectives can corroborate and supplement details, effectively reducing interfering false alarms caused by shadows, reflections from complex structures, stains, etc. It reduces the frequency of unnecessary manual re-inspections at parking lots, improving the actual passage efficiency and user experience.

[0027] This utility model offers flexible deployment, high cost-effectiveness, and protection of existing investments: its modular and distributed design concept is the core engineering advantage. It allows for seamless upgrades to existing sites equipped only with a central area scanning device—simply adding matching front and rear line scanning hardware modules and connecting them to a pre-installed control box. It maximizes the use of existing infrastructure (central scanning equipment, control box, triggering system, etc.), significantly extending the lifespan of core equipment and drastically reducing the overall system construction and modification costs. Pre-installed wiring interfaces ensure convenient installation and maintenance. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0029] Figure 1 This is a top view of the overall structure.

[0030] Figure 2 This is a schematic diagram illustrating the direction of vehicle movement.

[0031] Figure 3 This is a side view of the overall structure.

[0032] Figure 4 This is a schematic diagram of the explosion effect of the main module.

[0033] Figure 5 This is a schematic diagram of the explosion effect of the additional module.

[0034] Figure 6 Top view of the camera housing.

[0035] Figure 7 Side view of the camera housing. Detailed Implementation

[0036] The core objective of this invention is to overcome the problems of efficiency and accuracy being incompatible and blind spots in single-view imaging systems.

[0037] 1. Overview of the technical solution: such as Figure 1As shown, based on the already deployed central area scan main module 1 (fixed directly below the center of the scan channel, providing a vertically upward viewing angle), the following is added: Forward Line Scan Attachment 2: Installed upstream in the direction of vehicle travel (in front of the central module).

[0038] Rearward Line Scan Attachment Module 2: Installed downstream of the vehicle's direction of travel (behind the central module).

[0039] The front and rear auxiliary modules and the central main module are designed independently and modularly in terms of physical structure.

[0040] 2. Core Working Mechanism: Synchronous data capture: such as Figure 2 As shown (the red arrow indicates the direction the camera is facing), when a vehicle enters the scanning area and is triggered, the forward line scan module, the central surface scan module, and the rear line scan module start working almost simultaneously.

[0041] Central scanning module: Quickly captures global images of the chassis area passing through its field of view, obtaining a wide-field-of-view panoramic image of the main central part of the vehicle's underside.

[0042] The forward / backward add-on modules employ a tilted optical imaging design: The undercarriage scanning camera is installed at an angle: the optical axis of the undercarriage scanning camera lens in the module is installed at a preset angle in a non-vertical direction, so that it has a downward penetrating scanning angle.

[0043] Imaging mechanism and core value: When a vehicle enters / exits its field of vision, (1) Perform continuous, line-by-line high-resolution imaging along the field of view trajectory; (2) The oblique light path can penetrate the gaps between adjacent structures under the vehicle (such as between crossbeams and protective plates, and gaps in wiring harnesses) and directly capture: ‣Hidden interlayer areas that cannot be covered by traditional vertical perspective (such as between double-layer floor plates, spare tire compartment interlayer, and cavity above axle). ‣High-value targets: foreign objects hidden in the interlayer, illegally modified equipment, or attached hazardous materials (such as magnetic explosives).

[0044] Data output: Generates fine strip images containing details of the internal structure of the interlayer, providing irreplaceable deep-level perspective data for vehicle undercarriage safety.

[0045] Multi-source raw data output: The core function of the system hardware is to acquire and output raw image data streams in three different modalities (area scan snapshot + line scan continuous strip) and three different geometric positions (forward oblique upward view + central vertical view + rear oblique upward view).

[0046] 3. Key System Integration Design: Module connectivity: The cables (data cables, power cables, etc.) of the front and rear line scanning modules and the central main module are collected and connected through standardized cable holes / interfaces pre-installed on the integrated control box.

[0047] Deployment: This distributed modular design supports direct upgrades and transformations of existing single central surface scanning equipment sites. Functional leaps can be achieved by adding front and rear line scanning modules, which greatly saves costs and is highly feasible for engineering implementation.

[0048] During a single vehicle passage, the system, through innovations in hardware structure and working mechanism, simultaneously acquires an "overall overview" from a central vertical perspective and "high-precision local scans" from front and rear oblique downward perspectives, providing an unprecedented multi-dimensional raw data foundation for subsequent comprehensive, blind-spot-free, and high-precision under-vehicle safety analysis.

[0049] Example

[0050] The aforementioned technical solution will be illustrated below with a specific embodiment: System composition and deployment: Infrastructure: A pre-installed mounting base (not shown in the diagram) is provided on the vehicle scanning lane, such as... Figure 3 As shown, a main module 1 and an auxiliary module 2 are arranged on the mounting base. There are two auxiliary modules 2, namely a forward auxiliary module and a backward auxiliary module. Scanning module layout: Central Main Module 1: Fixedly installed on the gantry directly below or above the center of the vehicle scanning area. The core of the module is a vehicle undercarriage scanning camera, equipped with a wide-angle lens and a vertically downward-facing light source (such as an LED white light array). It primarily captures fast panoramic images of the main area of ​​the vehicle chassis.

[0051] Forward Attachment Module 2: Installed in front of the central module (upstream of the vehicle's entry direction). The core of the module is: a vehicle under-scan camera.

[0052] Rear Attachment Module 2: Structurally identical to the Forward Attachment Module 2, it is installed behind the central module (downstream in the vehicle departure direction) (symmetrically positioned with the Forward Attachment Module 2). It is equipped with the same (or performance-matched) under-vehicle scanning camera as the Forward Module 2.

[0053] Features of Add-on Module 2: Independent modular design: The front and rear line scanning modules are physically independent and can be separated from the central main module. Each additional module 2 includes: an additional lens cover 21, a second camera 22, a rigid bracket 23, and an additional pre-embedded housing 24, which facilitates individual maintenance, replacement, or upgrades.

[0054] Non-perpendicular illumination angle: The second cameras 22 (under-vehicle scanning cameras) in the front and rear line scanning modules are both mounted at a preset tilt angle via rigid brackets 23, with their lens centerlines pointing obliquely towards the key areas of the vehicle chassis. The installation angle is optimized to maximize blind spot coverage.

[0055] Among them, such as Figure 4 As shown, the undercarriage scanning camera at the center of the central surface scanning main module 1 is the first camera 105. The central surface scanning main module 1 mainly includes: The main embedded box 106 is fixedly installed at a preset position. The main embedded box 106 has through holes on both sides for passing through circuits that are connected to the auxiliary modules 2 on both sides.

[0056] The main pre-embedded box 106 is equipped with a main panel 103 on the top; the main panel 103 has a main camera hole in the middle for mounting a vehicle under-scanning camera 105; the main panel 103 has main lamp holes on both sides for mounting LED light groups 104.

[0057] A main camera protective cover 101 is installed on the main camera hole, and an LED light protective cover 102 is installed on the main light hole.

[0058] Two auxiliary modules 2 are symmetrically arranged on both sides of the main module 1, namely the forward auxiliary module 2 and the backward auxiliary module 2. For example... Figure 5 As shown, additional module 2 includes: An auxiliary embedded box 24 is set on the side of the main embedded box 106. The side of the auxiliary embedded box 24 is provided with through holes, the position and size of which correspond to the through holes opened on both sides of the main embedded box 106, for the purpose of laying the line.

[0059] The top of the additional embedded box 24 is fixed with a rigid bracket 23 for mounting the undercarriage scanning camera 22. The mounting surface on the rigid bracket 23 is set at a preset angle with the horizontal plane, thereby causing the undercarriage scanning camera 22 to form a preset angle with the axis of the undercarriage scanning camera 105.

[0060] An additional lens cover 21 is installed on the outer side of the undercarriage scanning camera 22 on the rigid bracket 23 to protect the undercarriage scanning camera 22.

[0061] Additional lens hood 21 and main camera hood 101, such as Figure 6 As shown, a light path aperture is opened in the middle, allowing light to pass through it and enter the lens.

[0062] like Figure 7 As shown, the auxiliary lens cover 21 and the main camera cover 101 have a frustum-shaped cross section, and the optical path through hole is set with an opening at a preset angle of α*2.

[0063] Where α is the preset tilt angle for mounting the undercarriage scanning camera 22.

[0064] In the optimized scheme, based on the oblique scanning requirements, 10° < α < 50°. The specific tilt angle is determined according to the chassis structural characteristics of the vehicle under inspection, and the dimensions shown in the illustrations are generated based on parameters from a typical embodiment.

[0065] This utility model provides a concept and method for a dual-mode, multi-view vehicle undercarriage safety inspection device. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A dual-mode multi-view vehicle underbody inspection apparatus, characterized by, include: A main module (1) is fixedly installed in the center of a preset vehicle scanning area. The first camera (105) in the main module (1) is perpendicular to the plane of the target to be scanned and is used to capture a panoramic image of the main body area of ​​the vehicle chassis. The main module (1) is provided with additional modules (2) on both sides. The second camera (22) contained in the additional module (2) forms a preset angle with the target plane to be scanned, and is used to capture the oblique view image of the vehicle chassis. The main module (1) includes: A main embedded box (106) is fixedly installed at a preset position. A main panel (103) is installed on the top of the main embedded box (106). A main camera hole is opened on the main panel (103) for installing the first camera (105). The additional module (2) includes: An additional embedded box (24) is fixedly installed on the side of the main embedded box (106). A rigid bracket (23) is installed on the top of the additional embedded box (24). The rigid bracket (23) has an installation surface that forms a preset angle with the plane of the target to be scanned, which is used to install the second camera (22).

2. The dual-mode multi-view vehicle underbody inspection apparatus of claim 1, wherein, The main panel (103) is located outside the first camera (105) and a main camera protective cover (101) is installed.

3. The dual mode multi-view vehicle underbody inspection apparatus of claim 2, wherein, On the main panel (103), main light holes are provided on both sides of the main camera hole for installing LED light groups (104).

4. The dual mode multi-view vehicle underbody inspection apparatus of claim 3, wherein, An LED lamp protective cover (102) is installed on the main panel (103) outside the LED lamp group (104).

5. The dual mode multi-view vehicle underbody inspection apparatus of claim 4, wherein, The main embedded box (106) has through holes on its side for running lines.

6. The dual mode multi-view vehicle underbody inspection apparatus of claim 5, wherein, The mounting surface of the rigid bracket (23) is located outside the second camera (22) and is fitted with an additional lens cover (21).

7. The dual mode multi-view vehicle underbody inspection apparatus of claim 6, wherein, The additional lens cover (21) and the main camera cover (101) are made of rigid material and have an optical path through hole in the middle.

8. The dual mode multi-view vehicle underbody inspection apparatus of claim 7, wherein, The additional lens cover (21) and the main camera cover (101) are frustum-shaped, and the optical path through hole is set with an opening at a preset angle α*2, where α is the preset tilt angle for the installation of the second camera (22), and 10°<α<50°.

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