Variable-diameter multi-camera shell seal management terminal and panoramic image in-situ acquisition method thereof

Abstract

The application discloses a variable-diameter multi-camera housing seal management terminal and a panoramic image in-situ acquisition method thereof, which comprises a housing, the side wall of which is provided with a single-leaf double-curved surface variable-diameter structure satisfying a preset equation; at least three first cameras are uniformly arranged along the top of the housing in a circumferential direction and used for acquiring images of the whole area of a document to be sealed outside the edge of the bottom of the housing; a sliding and overturning mechanism is installed in the housing and comprises a driving motor, a transmission assembly and an inner support; the inner support is used for supporting and guiding the transmission assembly to perform lifting and overturning movements; a seal is connected to the transmission assembly of the sliding and overturning mechanism and is driven by the driving motor to perform lifting and overturning movements; a second camera is arranged on the transmission assembly and located at the opposite side of the seal and used for vertically shooting the area covered by the bottom of the housing; and the inner support is provided with an avoiding structure adjacent to the lower end of the document to be sealed and used for avoiding the image acquisition light path of the second camera. The application has the advantages of high efficiency, complete image acquisition and low cost.

Description

Technical Field

[0001] This invention relates to the field of seal equipment technology, and in particular to a seal management terminal with a variable diameter multi-camera housing and its panoramic image in-situ acquisition method. Background Technology

[0002] Ensuring the legality and authenticity of seal usage is a crucial aspect of risk control for enterprises and institutions. Traditional physical seal management relies on manual supervision and registration, which suffers from drawbacks such as significant regulatory loopholes and difficulties in traceability. With the development of the Internet of Things (IoT) and smart hardware technologies, intelligent seal management terminals have emerged. By integrating identity authentication, motor drive, communication, and image acquisition modules into the terminal, they enable information-based supervision of the seal usage process.

[0003] Existing smart seal management terminals typically possess image capture capabilities for stamped documents. Their technical solutions can be broadly categorized into two types: The first is the "stamp first, then photograph" mode. This involves the user removing the terminal from the paper after the stamping action and then using a built-in or external document scanner to photograph the document. This mode separates image capture from the stamping action in time and space, making it impossible to prove that the photographed document is the same one covered by the terminal casing at the moment of stamping. This poses a risk that documents may be swapped after stamping or replaced with different photographed documents, resulting in fundamental deficiencies in the integrity of supervision. Furthermore, the cumbersome operation process reduces stamping efficiency. The second type is the "in-situ photographing" mode, which attempts to integrate a camera into the terminal casing to photograph documents without moving the terminal. However, since the terminal casing must press against the document surface to achieve stable stamping when stamping, the casing itself will block the area directly below it (i.e., the "placement area"), causing the camera fixed outside the casing to be unable to capture the covered area, forming a blind spot in image acquisition. Similarly, it is impossible to ensure the integrity of the acquired image, making it difficult to prevent fraudulent behavior such as replacing the document at the moment of stamping.

[0004] To further eliminate blind spots, existing technologies have introduced solutions that involve placing cameras inside the terminal housing to capture images of both the inner and outer areas. For example, Chinese patent document CN119299867A discloses a solution that uses a second camera module inside the housing to capture images of areas covered by the housing, aiming to stitch these images with external images for integrity verification. However, such solutions face a fundamental limitation in practical applications due to the internal mechanical structure of the terminal. To achieve automatic raising and lowering of the stamp, smart stamp terminals must have a precise sliding mechanism and an internal support for supporting and guiding this mechanism within their housing. This internal support typically has a vertical guide section to ensure the stability and accuracy of the stamp's movement. When the camera is positioned inside the housing to capture images of the bottom document, the physical structure of the internal support is precisely located in the shooting optical path, and its lower guide section severely obstructs the view, resulting in a fixed shape missing or shadow in the captured "occupying area" image, making it impossible to obtain a complete circular field of view. To address this occlusion issue, the patent document attempts to compensate for the limitations of a single viewpoint by using multiple internal cameras at different positions and angles to acquire images separately and then stitching them together. However, this method does not fundamentally eliminate the direct obstruction of the imaging optical path by the internal support structure, making it impossible to obtain stable, orthorectified, unobstructed images, and also increasing equipment costs. Therefore, obtaining stable, orthorectified, unobstructed internal images while reasonably controlling costs remains a critical technical bottleneck that urgently needs to be overcome to achieve high-quality internal in-situ forensics. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a stamp management terminal with a variable diameter multi-camera housing that improves efficiency, provides complete image acquisition and has low cost, as well as a method for in-situ acquisition of panoramic images.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A stamp management terminal with a variable-diameter multi-camera housing, comprising: The shell has a sidewall designed as a single-leaf hyperboloid variable-diameter structure that satisfies a preset equation; At least three first cameras are evenly arranged along the top circumference of the housing to capture multi-view images of the entire area of ​​the printed document outside the bottom edge of the housing. A sliding tilting mechanism is installed inside the housing, including a drive motor, a transmission assembly, and an inner support; the inner support is used to support and guide the transmission assembly to perform lifting and tilting movements. The seal is connected to the transmission component of the sliding flipping mechanism and is driven by the drive motor to perform lifting and flipping movements; The second camera is mounted on the transmission component of the sliding flipping mechanism and is located on the opposite side of the seal. It is used to vertically photograph the area of ​​the document to be stamped covered by the bottom of the housing before the transmission component drives the seal to perform the stamping action. The lower end of the inner support near the document to be printed is provided with a clearance structure to avoid the optical path of the second camera image acquisition.

[0007] As a further improvement to the above technical solution: The avoidance structure is shaped by curved surface cutting so that the boundary of the image captured by the second camera is a concentric circle that fits into the bottom edge of the housing.

[0008] The second camera has symmetrical fill lights arranged on both sides.

[0009] The distance between the two supplementary lights is set to s to avoid shadows during image acquisition, wherein s satisfies the following relationship: , Where d is the inner diameter of the bottom of the shell, d′ is the distance between the inner sides of the avoidance structures on both sides of the lower end of the inner support, h′ is the height of the second camera when the image is acquired, and t is the thickness of the avoidance structure.

[0010] The seal management terminal is also equipped with an inertial sensor. During the stamping process, when the inertial sensor detects the vibration behavior of the seal management terminal, it sends a signal feedback to stop the drive motor.

[0011] The transmission assembly includes a U-shaped frame, a threaded sleeve fixed to the U-shaped frame, and a rotating disk for mounting the seal. The inner support has a vertical sliding groove, and a rotating shaft is located on its inner side. The U-shaped frame is slidably mounted on the outer side of the inner support, and the threaded sleeve is threadedly connected to the lead screw of the drive motor. The rotating disk has lifting lugs at both ends, each lug having a movable groove that slides with the rotating shaft, and a pin at the bottom of each lug. The pin is placed within the sliding groove and slidably connected to a clearance groove on the U-shaped frame. When the lead screw of the drive motor rotates, it drives the U-shaped frame to move up and down along the outer wall of the inner support. The pin moves up and down along the sliding groove with the U-shaped frame, driving the movable groove to rotate around the rotating shaft, thereby driving the rotating disk and the seal to complete the lifting and rotating motion.

[0012] The housing is provided with an identification mechanism for biometric verification to confirm identity. The identification mechanism includes a fingerprint recognition module and a face recognition module. The fingerprint recognition module is located on one outer surface of the upper part of the housing, and the face recognition module is located on the other outer surface of the upper part of the housing.

[0013] The housing is also provided with a triggering mechanism, which is a touch screen. The lower two sides of the housing are provided with touch sensing strips that can sense the user's grip status and provide prompts through the touch screen.

[0014] An ink cartridge is also provided inside the housing.

[0015] A method for in-situ panoramic image acquisition of a stamp management terminal with a variable-diameter multi-camera housing includes the following steps: Internal spacer area image acquisition steps: The second camera, through the unobstructed light path formed by the avoidance structure at the bottom of the inner bracket, vertically captures the printing document area covered by the bottom of the housing to obtain an image of the internal spacer area; External panoramic image acquisition steps: During a set time period before the stamp touches the document to be stamped, at least three of the first cameras are simultaneously triggered. Using the unobstructed viewing window provided by the single-leaf hyperboloid variable diameter structure of the housing, images of the external document area at the bottom edge of the housing are simultaneously acquired from multiple perspectives to obtain multiple external area images. Stamping execution steps: After completing the acquisition of the internal occupant area image and the external area image, the drive motor continues to drive the transmission component to press the stamp down, completing the stamping action on the document to be stamped; Panoramic image synthesis and verification steps: The internal occupancy area image and multiple external area images are corrected and stitched together to generate a complete panoramic image covering the stamping location of the document and its surrounding area; and the panoramic image is compared and verified with the pre-submitted application document for stamping.

[0016] As a further improvement to the above technical solution: Before the internal occupancy area image acquisition step, the user's identity is verified. The user is verified by the fingerprint recognition module and the face recognition module in sequence. The face recognition module displays the captured user image on the touch screen to assist the user in the verification. After the user's identity is verified, the internal occupancy area image acquisition step is executed.

[0017] During the internal occupancy area image acquisition step, the second camera acquires images in real time and displays them on the touch screen to help the user determine the stamping location.

[0018] During the external panoramic image acquisition step, when the user touches the touch sensor strip, the drive motor stops moving and the touch display screen helps the user to hold the device correctly.

[0019] During the stamping process, when the inertial sensor detects vibration in the stamp management terminal, it sends a feedback signal to the main control board of the stamp management terminal, triggering the drive motor to stop and displaying a prompt on the touch screen.

[0020] Compared with the prior art, the advantages of the present invention are as follows: Achieving seamless panoramic image coverage of the external document area: By employing a housing with a single-leaf hyperboloid variable diameter structure, and in conjunction with at least three first cameras evenly distributed circumferentially on the top, the physical obstruction of the camera's field of view by traditional columnar or box-shaped housings is effectively overcome. This housing structure provides an optimized, unobstructed optical window for each camera, ensuring that the fields of view of multiple cameras can seamlessly cover the entire document area outside the bottom edge of the housing with minimal overlap, thereby capturing complete, high-quality external panoramic images in a single operation.

[0021] The core mechanical obstruction problem of internal image acquisition has been completely solved: by setting up a dedicated avoidance structure in the lower guide part of the inner bracket to avoid the optical path of the second camera, the direct obstruction of the shooting line of view by the inner bracket in the traditional design has been physically removed. This structural innovation ensures that the second camera can obtain a complete, unobstructed vertical shooting field of view, fundamentally solving the technical problem of missing images or fixed shadows in the "occupying area" caused by the presence of the internal support mechanism.

[0022] This method ensures the in-situ nature and process traceability of the internal "placement area" imagery: a second camera is directly mounted on the transmission component of the sliding flipping mechanism and positioned on the back of the seal. This allows it to capture a vertical image of the document area to be covered from directly behind the seal just before the transmission component pushes the seal down. This "movement-accompanied" acquisition method guarantees a strict spatiotemporal correspondence between the acquired image and the stamping position, achieving true "in-situ" evidence collection and providing crucial process video evidence for the stamping process. It effectively prevents the risk of documents being switched at the moment of stamping.

[0023] The system integration and imaging reliability have been optimized: Through systematic optimization of structural design (variable diameter shell, internal support avoidance) and component layout (camera follow-up), this solution replaces the multiple static internal cameras that may be required in the existing technology with a single, integrated second camera dynamic acquisition solution. While ensuring or even improving image quality (such as integrity and orthophoto angle), it simplifies the internal structure, reduces the algorithm complexity of multi-sensor calibration and image fusion, and improves the overall reliability and cost-effectiveness of the system. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the stamp management terminal with a variable-diameter multi-camera housing according to the present invention.

[0025] Figure 2 This is a schematic diagram of the stamp management terminal of the variable diameter multi-camera housing of the present invention (stamping state).

[0026] Figure 3 This is a schematic diagram of the seal management terminal of the variable diameter multi-camera housing of the present invention (unused state).

[0027] Figure 4 This is a schematic diagram of the sliding and flipping mechanism of the stamp management terminal of the variable diameter multi-camera housing of the present invention (stamping state).

[0028] Figure 5 This is a schematic diagram of the sliding and flipping mechanism of the stamp management terminal of the variable diameter multi-camera housing of the present invention (in unused state).

[0029] Figure 6 This is a schematic diagram of the flip disk structure of the present invention.

[0030] Figure 7 This is a diagram of the calculation model for the spacing between the supplementary lights in this invention.

[0031] Figure 8 This is a schematic diagram of the field of view of the second camera in this invention.

[0032] Figure 9 This is an image of the inside of the housing captured by the second camera of the seal management terminal of the variable diameter multi-camera housing of the present invention.

[0033] Figure 10 This is an image of the inside of the housing captured by the second camera when the avoidance structure was not cut off by curved surface.

[0034] Figure 11 This is a flowchart illustrating the usage of the stamp management terminal of the variable-diameter multi-camera housing of the present invention.

[0035] The labels in the diagram represent: 1. Housing; 11. Touch sensor strip; 2. Trigger mechanism; 3. Sliding and flipping mechanism; 31. Drive motor; 32. Transmission assembly; 321. U-shaped frame; 3211. Clearance groove; 322. Threaded sleeve; 323. Flipping disc; 3231. Lifting lug; 32311. Movable groove; 32312. Pin shaft; 33. Inner support; 331. Slide groove; 332. Rotating shaft; 4. Seal; 5. Recognition mechanism; 51. Fingerprint recognition module; 52. Face recognition module; 6. First camera; 7. Second camera; 8. Fill light; 9. Ink cartridge. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 Hezhi Figure 6As shown, the seal management terminal of the variable-diameter multi-camera housing in this embodiment includes a housing 1, whose sidewall is configured as a single-leaf hyperboloid variable-diameter structure that satisfies a preset equation; at least three first cameras 6 are evenly arranged along the top circumference of the housing 1 to capture multi-view images of the entire area of ​​the document to be stamped outside the bottom edge of the housing 1; a sliding flip mechanism 3 is installed inside the housing 1 and includes a drive motor 31, a transmission component 32, and an inner support 33; the inner support 33 is used to support and guide the transmission component 32 to perform lifting and flipping movements; a seal 4 is connected to the transmission component 32 of the sliding flip mechanism 3 and is driven by the drive motor 31 to perform lifting and flipping movements; a second camera 7 is set on the transmission component 32 of the sliding flip mechanism 3 and is located on the opposite side of the seal 4, and is used to vertically photograph the area of ​​the document to be stamped covered by the bottom of the housing 1 before the transmission component 32 drives the seal 4 to perform the stamping action; the lower end of the inner support 33 near the document to be stamped is provided with an obstacle avoidance structure 333 for avoiding the image acquisition optical path of the second camera 7. During the stamping action, the second camera 7 first captures images of the document area covered by the bottom of the housing 1. Then, the sliding flipping mechanism 3 drives the stamp 4 to flip and move to stamp. At the same time, each of the first cameras 6 captures images of the document outside the bottom edge of the housing 1. This invention achieves panoramic image capture of the document area outside the device and the document covered inside without blind spots by adopting a housing 1 with a single-leaf hyperboloid variable diameter structure and an obstacle avoidance structure 333 specifically designed to avoid the light path of the second camera 7. This simplifies the internal structure and reduces costs.

[0038] In this embodiment, the avoidance structure 333 is shaped by curved surface cutting so that the boundary of the image captured by the second camera 7 is a concentric circle that fits into the bottom edge of the housing 1. In this structure, due to the presence of the inner bracket 33, the bottom of the housing 1 cannot form a complete circle. By forming the avoidance structure 333 by curved surface cutting of the lower end of the inner bracket 33, the boundary shape of the image captured by the second camera 7 is circular, which can obtain a more complete image and meet the requirements of visual comfort.

[0039] In this embodiment, supplementary lights 8 are symmetrically arranged on both sides of the second camera 7. Since the second camera 7 needs to capture images from inside, the lighting conditions are poor, and supplementary lights 8 are needed to provide additional light.

[0040] In this embodiment, an inertial sensor is also installed on the seal management terminal. During the stamping process, when the inertial sensor detects vibration behavior of the seal management terminal, it sends a signal feedback to stop the drive motor 31. By installing an inertial sensor on the main control board of the seal management terminal to monitor vibration behavior during the stamping process, the drive motor 31 is stopped when the user moves the device significantly or abruptly, thus stopping the stamping process and preventing the user from replacing the document being stamped.

[0041] In this embodiment, the transmission assembly 32 includes a U-shaped frame 321, a threaded sleeve 322 fixed to the U-shaped frame 321, and a rotating disk 323 for mounting the seal 4; the inner support 33 is provided with a vertical sliding groove 331, and a rotating shaft 332 is provided on its inner side; the U-shaped frame 321 is slidably mounted on the outer side of the inner support 33, and the threaded sleeve 322 is threadedly connected to the lead screw of the drive motor 31; the rotating disk 323 is provided with lifting lugs 3231 at both ends, and the lifting lugs 3231 are provided with movable grooves 323 that are slidably connected to the rotating shaft 332. 11. A pin 32312 is provided at the bottom of the lifting lug 3231; the pin 32312 is placed in the slide groove 331 and is slidably connected to the clearance groove 3211 opened on the U-shaped frame 321; when the lead screw of the drive motor 31 rotates, it drives the U-shaped frame 321 to move up and down along the outer wall of the inner support 33, and the pin 32312 moves up and down along the slide groove 331 with the U-shaped frame 321, and drives the movable groove 32311 to rotate around the rotating shaft 332, thereby driving the flipping plate 323 and the seal 4 to complete the lifting and flipping movement. In this structure, the rotation of the lead screw of the drive motor 31 forces the lead sleeve 322 to move up and down along its thread, thereby driving the U-shaped frame 321 to move up and down along the slide groove 331 on the outer side wall of the inner support 33. During this process, the pin 32312 follows the U-shaped frame 321 to move up and down along the slide groove 331, driving the movable groove 32311 to rotate around the rotating shaft 332 in place, so that the flipping disk 323 completes the flipping and lifting motion with the stamp 4. Its structure is compact and the motion trajectory is controllable.

[0042] In this embodiment, the housing 1 is provided with an identification mechanism 5 for biometric verification to confirm identity. The identification mechanism 5 includes a fingerprint recognition module 51 and a face recognition module 52. The fingerprint recognition module 51 is disposed on the outer surface of one side of the upper part of the housing 1, and the face recognition module 52 is disposed on the outer surface of the other side of the upper part of the housing 1. In this structure, the combination of fingerprint recognition and face recognition improves the security and reliability of the user's identity authentication.

[0043] In this embodiment, a triggering mechanism 2 is also provided on the housing 1. The triggering mechanism 2 is a touch screen. Touch sensing strips 12 are provided on both sides of the lower part of the housing 1 to sense the user's grip and provide prompts via the touch screen. In this structure, the seal management terminal is operated by triggering the touch screen. When the user grips the housing 1 below the first camera 6, they will touch the touch sensing strips 12, causing the first camera 6 to be blocked. At this time, the device will stop the stamping behavior and provide a prompt to the user on the touch screen.

[0044] In this embodiment, an ink cartridge 9 is also provided inside the housing 1. This structure extends the number of printing cycles provided by the internal ink cartridge 9.

[0045] Depend on Figure 7 and Figure 8It is known that the field of view boundary of the second camera 7 should not be smaller than the bottom opening area of ​​the housing 1. Considering that the field of view of the second camera 7 is rectangular, but the bottom opening of the housing 1 is circular, this embodiment constrains the field of view of the second camera 7 by the size of the bottom opening area of ​​the housing 1. The inner diameter of the bottom of the housing 1 is... d The distance between the inner sides of the two avoidance structures 333 is d′ Thickness is t Make a diameter of on the bottom surface of shell 1 d Gao Wei H The cone coaxial with shell 1 has a horizontal angle of its generatrix. α By cutting off the portion where the avoidance structure 11 intersects with the cone, the boundary of the image captured by the second camera 7 can be made into a concentric circle that fits into the bottom edge of the housing 1, where the following relationship is satisfied: Considering the light emitted by the fill light 8, when it shines from the top to the bottom of the chamfered corner of the avoidance structure 333, it may create a noticeable shadow on the printed document, thus affecting the content being photographed. When the horizontal angle between the center of the fill light 8 and the top of the chamfered corner of the avoidance structure 333 is equal to... α At that time, it can just avoid producing shadows. Therefore, the circle where the cone intersects the top plane of the second camera 7 is the optimal position for the shadowless arrangement of the fill light 8. When the second camera 7 is rotated and moved to a height of h′ by the flip disk 323 to take a picture, it can be deduced from similar triangles: but: Figure 9 This is an image captured by the second camera 7 in this embodiment. Figure 10 The image captured by the second camera 7 is when the avoidance structure 333 is not cut off by curved surface. By comparison, it can be seen that after the avoidance structure 333 is set at the lower end of the inner bracket 33, the inner contour of the image captured by the second camera 7 is smooth and there is no straight edge obstruction.

[0046] like Figure 11 As shown, the panoramic image in-situ acquisition method of the stamp management terminal with variable diameter multi-camera housing of the present invention includes the following steps: Internal spacer area image acquisition steps: The second camera 7, through the unobstructed light path formed by the avoidance structure 333 at the lower part of the inner bracket 33, vertically captures the printing document area covered by the bottom of the housing 1 to obtain the internal spacer area image. External panoramic image acquisition steps: During the set time period before the stamp 4 touches the document to be stamped, at least three first cameras 6 are triggered simultaneously. Using the unobstructed viewing window provided by the single-leaf hyperboloid variable diameter structure of the housing 1, images of the external document area at the bottom edge of the housing 1 are acquired from multiple perspectives to obtain multiple external area images. Stamping execution steps: After completing the acquisition of images of the internal occupancy area and the external area, the drive motor 31 continues to drive the transmission component 32 to press down the stamp 4, thus completing the stamping action on the document to be stamped. Panoramic image synthesis and verification steps: The internal occupancy area image and multiple external area images are corrected and stitched together to generate a complete panoramic image covering the stamping location of the document to be stamped and its surrounding area; the panoramic image is then compared and verified with the pre-submitted application document for stamping.

[0047] This method uses the aforementioned variable-diameter multi-camera housing for the seal management terminal. Through the single-leaf hyperboloid variable-diameter structure design of housing 1 and the avoidance structure design at the lower end of the inner support, it can perform in-situ panoramic acquisition of images inside and outside the terminal, ensuring the consistency between the document to be stamped and the image acquisition, and avoiding the substitution of stamps.

[0048] In this embodiment, before the internal occupant area image acquisition step, the user's identity is verified. The user sequentially undergoes identity verification through the fingerprint recognition module 51 and the face recognition module 52. The face recognition module 52 displays the acquired user image on the touch screen to assist the user in verification. After the user's identity verification is successful, the internal occupant area image acquisition step is executed. The user undergoes dual identity verification through fingerprint and facial recognition to ensure that the identity information is correct.

[0049] In this embodiment, during the internal occupancy area image acquisition step, the second camera 7 acquires images in real time and displays them on the touch screen to assist the user in determining the stamping position. The second camera 7 frames the portion covered by the casing 1 to help the user determine the stamping position.

[0050] In this embodiment, during the external panoramic image acquisition step, when the user touches the touch sensor strip 11, the drive motor 31 stops operating, and the touch screen displays a prompt to ensure the user holds the device correctly. The touch sensor strip 11 is pre-installed on the housing 1. When the user touches the touch sensor strip 11, it is determined that the user's hand is obstructing the first camera 6. At this time, the touch screen displays a prompt to the user, ensuring that the user holds the stamp management terminal correctly, thus ensuring complete image acquisition of the external area of ​​the housing 1.

[0051] In this embodiment, during the stamping process, when the inertial sensor detects vibration in the stamp management terminal, it sends a feedback signal to the main control board of the stamp management terminal, triggering the drive motor 31 to stop and displaying a prompt on the touch screen. By setting an inertial sensor on the main control board, when the user causes significant or sudden vibration to the device during the stamping process, the inertial sensor sends a signal feedback, the main control board controls the drive motor 31 to stop, interrupting the stamping action, and prompts the user on the touch screen not to move the stamp management terminal during the stamping process.

[0052] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A stamp management terminal with a variable-diameter multi-camera housing, characterized in that, include: The shell (1) has a sidewall designed as a single-leaf hyperboloid variable-diameter structure that satisfies a preset equation; At least three first cameras (6) are evenly arranged around the top circumference of the housing (1) to capture multi-view images of the entire area of ​​the printed document outside the bottom edge of the housing (1); The sliding flipping mechanism (3) is installed inside the housing (1) and includes a drive motor (31), a transmission assembly (32) and an inner bracket (33); the inner bracket (33) is used to support and guide the transmission assembly (32) to perform lifting and flipping movements. The seal (4) is connected to the transmission component (32) of the sliding flipping mechanism (3) and is driven by the drive motor (31) to perform lifting and flipping movements; The second camera (7) is mounted on the transmission component (32) of the sliding flipping mechanism (3) and is located on the opposite side of the seal (4). It is used to vertically photograph the area of ​​the document covered by the bottom of the housing (1) before the transmission component (32) drives the seal (4) to perform the stamping action. The inner support (33) is provided with a clearance structure (333) at the lower end of the document to be stamped, which is used to avoid the image acquisition optical path of the second camera (7).

2. The stamp management terminal with a variable-diameter multi-camera housing according to claim 1, characterized in that: The avoidance structure (333) is shaped by curved surface cutting so that the boundary of the image captured by the second camera (7) is a concentric circle that fits into the bottom edge of the housing (1).

3. The stamp management terminal with a variable-diameter multi-camera housing according to claim 2, characterized in that: The second camera (7) has supplementary lights (8) arranged symmetrically on both sides.

4. The stamp management terminal with a variable-diameter multi-camera housing according to claim 3, characterized in that: The distance between the two supplementary lights (8) is set as s To avoid shadows during image acquisition, the following conditions must be met. s The following relationship: ， in, d The inner diameter of the bottom of the shell (1) is d′ The distance between the inner sides of the clearance structures (333) on both sides of the lower end of the inner support (33) is the distance between the inner sides of the clearance structures (333). h′ The height of the second camera (7) during image acquisition. t To avoid the thickness of structure (11).

5. The stamp management terminal with a variable-diameter multi-camera housing according to claim 4, characterized in that: The seal management terminal is also equipped with an inertial sensor. During the stamping process, when the inertial sensor detects the vibration behavior of the seal management terminal, it sends a signal feedback so that the drive motor (31) stops operating.

6. The stamp management terminal with a variable-diameter multi-camera housing according to claim 5, characterized in that: The transmission assembly (32) includes a U-shaped frame (321), a threaded sleeve (322) fixed to the U-shaped frame (321), and a rotating disk (323) for mounting the seal (4); the inner support (33) is provided with a vertical sliding groove (331), and a rotating shaft (332) is provided on its inner side; the U-shaped frame (321) is slidably mounted on the outer side of the inner support (33), and the threaded sleeve (322) is threadedly connected to the lead screw of the drive motor (31); the rotating disk (323) is provided with lifting lugs (3231) at both ends, and the lifting lugs (3231) are provided with movable grooves (32311) that are slidably connected to the rotating shaft (332). The bottom of the lifting lug (3231) is provided with a pin (32312); the pin (32312) is placed in the slide groove (331) and is slidably connected to the clearance groove (3211) opened on the U-shaped frame (321); when the lead screw of the drive motor (31) rotates, it drives the U-shaped frame (321) to move up and down along the outer wall of the inner support (33), the pin (32312) moves up and down along the slide groove (331) with the U-shaped frame (321), and drives the movable groove (32311) to rotate around the rotating shaft (332), thereby driving the flipping plate (323) and the seal (4) to complete the lifting and flipping movement.

7. The stamp management terminal with a variable-diameter multi-camera housing according to claim 6, characterized in that: The housing (1) is provided with an identification mechanism (5) for biometric verification to confirm identity. The identification mechanism (5) includes a fingerprint recognition module (51) and a face recognition module (52). The fingerprint recognition module (51) is located on one side of the upper outer surface of the housing (1), and the face recognition module (52) is located on the other side of the upper outer surface of the housing (1).

8. The stamp management terminal with a variable-diameter multi-camera housing according to claim 7, characterized in that: The top of the housing (1) is also provided with a trigger mechanism (2), which is a touch screen. The lower two sides of the housing (1) are provided with touch sensing strips (11) that can sense the gripping status of the user and provide prompts through the touch screen.

9. The stamp management terminal with a variable-diameter multi-camera housing according to claim 8, characterized in that: An ink cartridge (9) is also provided inside the housing (1).

10. A method for in-situ panoramic image acquisition of a seal management terminal based on a variable-diameter multi-camera housing according to any one of claims 1 to 9, characterized in that: Includes the following steps: Internal spacer area image acquisition steps: The second camera (7) vertically captures the printing document area covered by the bottom of the housing (1) through the unobstructed light path formed by the avoidance structure (333) at the bottom of the inner bracket (33) to obtain the internal spacer area image; External panoramic image acquisition steps: During the set time period before the seal (4) touches the document to be stamped, at least three of the first cameras (6) are triggered simultaneously. Using the unobstructed window provided by the single-leaf hyperboloid variable diameter structure of the housing (1), images of the external document area at the bottom edge of the housing (1) are acquired from multiple perspectives to obtain multiple external area images. Stamping execution steps: After completing the acquisition of the internal occupancy area image and the external area image, the drive motor (31) continues to drive the transmission component (32) to drive the stamp (4) to press down and complete the stamping action on the document to be stamped; Panoramic image synthesis and verification steps: The internal occupancy area image and multiple external area images are corrected and stitched together to generate a complete panoramic image covering the stamping location of the document and its surrounding area; and the panoramic image is compared and verified with the pre-submitted application document for stamping.

11. The panoramic image in-situ acquisition method for the stamp management terminal with a variable-diameter multi-camera housing according to claim 10, characterized in that: Before the internal occupancy area image acquisition step, the user's identity is verified. The user sequentially performs identity verification through the fingerprint recognition module (51) and the face recognition module (52). The face recognition module (52) displays the acquired user image through the touch screen to assist the user in verification. After the user's identity verification is successful, the internal occupancy area image acquisition step is executed.

12. The panoramic image in-situ acquisition method for the seal management terminal with a variable-diameter multi-camera housing according to claim 11, characterized in that: In the internal occupancy area image acquisition step, the second camera (7) acquires images in real time and displays them on the touch screen to help the user determine the stamping position.

13. The panoramic image in-situ acquisition method for the seal management terminal with a variable-diameter multi-camera housing according to claim 12, characterized in that: In the external panoramic image acquisition step, when the user touches the touch sensing strip (11), the drive motor (31) stops moving and the user is able to hold the device correctly via the touch display screen.

14. The panoramic image in-situ acquisition method for the seal management terminal with a variable-diameter multi-camera housing according to claim 13, characterized in that: During the stamping process, when the inertial sensor detects vibration in the stamp management terminal, it sends a feedback signal to the main control board of the stamp management terminal, triggering the drive motor (31) to stop and displaying a prompt on the touch screen.

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