Auxiliary calibration device for image center of fisheye panoramic doorbell

Abstract

The utility model discloses a fisheye panoramic doorbell image center auxiliary verification device, which relates to the panoramic doorbell technology field, and comprises a verification box and a placing seat, the verification box is internally provided with a verification cavity, the inner side wall of the verification box is provided with a light-emitting member, the placing seat is arranged on the outer side surface of the verification box, and the verification cavity is provided with a light-emitting hole. The placement seat is provided with a verification hole, the verification hole is communicated with the verification cavity through a verification window formed in the side face of the verification box, and a lens of the fisheye doorbell observes the verification cavity through the verification hole; a closed controlled optical environment is formed by adopting the verification cavity arranged in the verification box and the light-emitting part arranged on the inner side wall, and light fluctuation, shadow and reflection interference of an external environment are eliminated through the uniform and controllable light source, so that the image sensor is ensured to acquire a stable calibration picture; and the fisheye doorbell can be quickly and accurately placed through the placing seat and the verification hole, so that repeated manual adjustment is avoided, and high-precision and high-efficiency calibration of the center of the fisheye image is realized.

Description

Technical Field

[0001] This utility model relates to the field of panoramic doorbell technology, and in particular to an auxiliary verification device for the center of a fisheye panoramic doorbell image. Background Technology

[0002] In recent years, with the growing demand for smart home security, panoramic doorbells equipped with fisheye lenses have been widely used due to their ability to provide ultra-wide-angle monitoring images. These devices achieve surround-view coverage through the optical distortion characteristics of fisheye lenses, effectively solving the problem of narrow field of view in traditional doorbells. However, limited by the optical nonlinearity of fisheye lenses and mechanical tolerances in the manufacturing and assembly process, image center shift is common in practical applications. This shift exacerbates the geometric distortion in key areas of the image, such as the facial recognition area.

[0003] In existing technologies, fisheye image center calibration often employs automatic correction schemes based on software algorithms, such as locating the center through edge detection or feature matching. However, these methods have significant drawbacks: firstly, changes in lighting and interference from obstructions in complex environments can easily lead to feature extraction failures; secondly, iterative computation of the algorithms is time-consuming, making it difficult to meet the efficiency requirements of rapid calibration on production lines. Furthermore, some schemes rely on manual positioning, requiring repeated adjustments to the physical position of the equipment to eliminate shadows or reflections, further reducing calibration consistency and efficiency. Therefore, a hardware-assisted calibration device capable of overcoming environmental interference and achieving high-precision, rapid positioning is needed to solve the image center offset problem caused by accumulated mechanical tolerances during the mass production of fisheye doorbells, while simultaneously improving production line calibration efficiency and product yield. Utility Model Content

[0004] The main purpose of this invention is to propose an auxiliary calibration device for the center of a fisheye panoramic doorbell image, which aims to provide a good calibration environment for fisheye doorbells and improve calibration speed and accuracy.

[0005] To achieve the above objectives, the present invention proposes a fisheye panoramic doorbell image center auxiliary verification device, comprising:

[0006] A verification box, wherein a verification cavity is provided inside the verification box, and a light-emitting element is provided on the inner side wall of the verification box;

[0007] A mounting base is provided on the outer side of the calibration box to hold the fisheye doorbell. The mounting base has a calibration hole, which is connected to the calibration cavity through a calibration window on the side of the calibration box. The lens of the fisheye doorbell observes the calibration cavity through the calibration hole.

[0008] In one embodiment, a reflector is provided on the inner side of the calibration box.

[0009] In one embodiment, there are multiple reflectors, all located around the periphery of the verification cavity, and the multiple reflectors together form the verification cavity.

[0010] In one embodiment, the light-emitting element is disposed on the inner wall of the calibration box near the mounting base.

[0011] In one embodiment, the light-emitting element includes an LED light strip disposed around the periphery of the verification window.

[0012] In one embodiment, the light-emitting element is connected to an adjuster for adjusting the light intensity of the light-emitting element.

[0013] In one embodiment, the calibration box includes a box body and a movable plate, the movable plate being movably connected to the box body, and the movable plate and the box body together forming the calibration cavity.

[0014] In one embodiment, the mounting base is recessed to form a mounting groove adapted to the shape of the fisheye doorbell.

[0015] In one embodiment, the placement slot has a recessed notch on its periphery to facilitate the removal of the fisheye doorbell.

[0016] In one embodiment, the mounting base is movably connected to the calibration box.

[0017] The technical solution of this utility model uses the calibration cavity set inside the calibration box and the light-emitting element set on the inner side wall to form a closed controlled optical environment. The uniform and controllable light source eliminates external ambient light fluctuations, shadows and reflection interference, ensuring that the image sensor acquires a stable calibration image. Furthermore, the structural design of the mounting base and the calibration hole enables the fisheye doorbell to be placed quickly and accurately through physical constraints, ensuring that the lens axis is aligned with the optical path of the calibration window. This avoids the need for repeated manual adjustments to the position and angle of the equipment, and achieves high-precision and high-efficiency calibration of the fisheye image center. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of the fisheye panoramic doorbell image center auxiliary verification device provided by this utility model;

[0020] Figure 2This is a schematic diagram of the assembly structure of the calibration box and the mounting base;

[0021] Figure 3 This is a schematic diagram of the internal structure of the verification box after it is opened;

[0022] Figure 4 A schematic diagram of another embodiment of the fisheye panoramic doorbell image center auxiliary verification device provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 100. Fisheye panoramic doorbell image center auxiliary verification device; 1. Verification box; 11. Verification cavity; 12. Reflector; 13. Light-emitting element; 14. Verification window; 15. Movable plate; 16. Box body; 2. Mounting base; 21. Verification hole; 22. Mounting slot; 23. Removal notch; 3. Fisheye doorbell.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] In recent years, with the growing demand for smart home security, panoramic doorbells equipped with fisheye lenses have been widely used due to their ability to provide ultra-wide-angle monitoring images. These devices achieve surround-view coverage through the optical distortion characteristics of fisheye lenses, effectively solving the problem of narrow field of view in traditional doorbells. However, limited by the optical nonlinearity of fisheye lenses and mechanical tolerances in the manufacturing and assembly process, image center shift is common in practical applications. This shift exacerbates the geometric distortion in key areas of the image, such as the facial recognition area.

[0030] In existing technologies, fisheye image center calibration often employs automatic correction schemes based on software algorithms, such as locating the center through edge detection or feature matching. However, these methods have significant drawbacks: firstly, changes in lighting and interference from obstructions in complex environments can easily lead to feature extraction failures; secondly, iterative computation of the algorithms is time-consuming, making it difficult to meet the efficiency requirements of rapid calibration on production lines. Furthermore, some schemes rely on manual positioning, requiring repeated adjustments to the physical position of the equipment to eliminate shadows or reflections, further reducing calibration consistency and efficiency. Therefore, a hardware-assisted calibration device capable of overcoming environmental interference and achieving high-precision, rapid positioning is needed to solve the image center offset problem caused by accumulated mechanical tolerances during the mass production of fisheye doorbells, while simultaneously improving production line calibration efficiency and product yield.

[0031] This utility model proposes a fisheye panoramic doorbell image center auxiliary verification device 100.

[0032] Please see Figures 1 to 4 In one embodiment of this utility model, the fisheye panoramic doorbell image center auxiliary verification device 100 includes:

[0033] Verification box 1, wherein a verification cavity 11 is provided inside the verification box 1, and a light-emitting element 13 is provided on the inner side wall of the verification box 1;

[0034] A mounting base 2 is provided on the outer side of the calibration box 1 to mount the fisheye doorbell 3. The mounting base 2 has a calibration hole 21. The calibration hole 21 is connected to the calibration cavity 11 through a calibration window 14 on the side of the calibration box 1. The lens of the fisheye doorbell 3 observes the calibration cavity 11 through the calibration hole 21.

[0035] like Figure 2 As shown, during the verification process, the fisheye doorbell 3 is first placed on the mounting base 2. At this time, the lens of the fisheye doorbell 3 is located in the verification hole 21 to observe the verification cavity 11. The verification cavity 11 provides a stable light source, making the acquired image more stable, which facilitates the system to perform calibration and adjustment based on the acquired image.

[0036] It should be noted that the mounting base 2 is located on the outside of the verification box 1 to avoid affecting the inside of the verification box 1 and to ensure the flatness of the inner side of the verification box 1.

[0037] The technical solution of this utility model uses the calibration cavity 11 set inside the calibration box 1 and the light-emitting element 13 set on the inner side wall to form a closed controlled optical environment. The uniform and controllable light source eliminates external ambient light fluctuations, shadows and reflection interference, ensuring that the image sensor acquires a stable calibration image. Furthermore, the structural design of the mounting base 2 and the calibration hole 21 enables the fisheye doorbell 3 to be placed quickly and accurately through physical constraints, ensuring that the lens axis is aligned with the optical path of the calibration window 14. This avoids the operation of manually adjusting the position and angle of the equipment repeatedly, and achieves high-precision and high-efficiency calibration of the fisheye image center.

[0038] Optionally, a reflector 12 is provided on the inner side of the verification box 1.

[0039] like Figure 3 As shown, it should be noted that the reflector 12 uses a high reflectivity material to perform secondary reflection and diffusion of the light from the light-emitting element 13, eliminating local brightness differences and dark corners within the calibration cavity 11, ensuring that the light field distribution captured by the lens of the fisheye doorbell 3 is uniform, and avoiding center point identification deviation caused by uneven illumination. This is especially suitable for edge area calibration of the fisheye doorbell 3 with a large viewing angle.

[0040] Optionally, the reflector 12 may be made of reflective materials such as diffuse reflection coating, mirror aluminum foil, or reflective paper. This embodiment does not impose specific limitations on this.

[0041] It is understandable that the high-efficiency reflective characteristics of the reflector 12 can reduce the brightness requirement of the light-emitting element 13, thereby reducing energy consumption and heat generation while ensuring the brightness of the calibrated screen.

[0042] Optionally, there are multiple reflectors 12, all located around the verification cavity 11, and the multiple reflectors 12 together form the verification cavity 11.

[0043] It is understood that by forming a calibration cavity 11 by combining multiple reflectors 12, the uniformity of the light field distribution can be greatly improved. Furthermore, the cross-reflection network formed by combining multiple reflectors 12 can generate redundant optical paths, suppressing the reflection abnormalities caused by surface contamination or slight deformation of a single reflector 12. Through the balanced superposition of multi-path reflected light, stable calibration accuracy can still be maintained even in scenarios with slight contamination or local aging of reflectors 12.

[0044] In some embodiments, there are six reflectors 12, which are respectively connected to the six inner sides of the calibration box 1.

[0045] Optionally, the light-emitting element 13 is disposed on the inner wall of the calibration box 1 on the side near the mounting base 2.

[0046] like Figure 3 As shown, it should be noted that the light-emitting element 13 is placed on the inner wall of the calibration box 1 near the mounting base 2, so that the light from the light-emitting element 13 forms an indirect lighting environment after being diffusely reflected by the reflector 12 around the calibration cavity 11. This avoids direct exposure of the high-brightness light source to the photosensitive element of the fisheye doorbell 3, and prevents local overexposure caused by concentrated light intensity. In the indirect lighting mode, the secondary light source formed by the reflector 12 has a more stable spatial distribution characteristic, reduces interference from light changes, and makes the color tone more stable.

[0047] Optionally, the light-emitting element 13 includes an LED light strip, which is disposed around the verification window 14.

[0048] like Figure 3 As shown, it should be noted that the LED light strips are arranged around the calibration window 14 to form a ring-shaped surface light source. The equally spaced multiple LEDs provide an axially symmetrical incident light field. This ensures that the light uniformly covers the lens field of view of the fisheye doorbell 3 along the normal direction of the calibration window 14, avoiding asymmetrical brightness gradients caused by a single point light source, effectively suppressing additional distortion in the lens edge region, and assisting in the calibration of the fisheye doorbell 3's lens.

[0049] Optionally, the light-emitting element 13 is connected to an adjuster to adjust the light intensity of the light-emitting element 13.

[0050] It should be noted that the regulator supports linear or segmented adjustment of the light intensity of the LED light strip. It can accurately match the optimal lighting intensity according to the sensitivity of the photosensitive element or the light transmittance characteristics of the lens of different fisheye doorbell models. For example, for low-sensitivity devices, the light intensity can be increased to improve the clarity of calibration features, while for high-sensitivity devices, the light intensity can be reduced to avoid overexposure, ensuring the consistency of cross-model calibration.

[0051] In some embodiments, the LED light strip is electrically connected to the regulator to adjust the brightness of the LED light strip.

[0052] Optionally, the verification box 1 includes a box body 16 and a movable plate 15, the movable plate 15 being movably connected to the box body 16, and the movable plate 15 and the box body 16 together forming the verification cavity 11.

[0053] like Figure 3 As shown, it can be understood that the box 16 and the movable plate 15, which are connected by a movable connection, can be opened and closed. By opening the calibration chamber 11, the internal components such as the reflector 12 and the light-emitting element 13 can be directly exposed. Cleaning (such as dust removal of the reflector 12), maintenance (such as replacement of the LED light strip), or calibration parameter adjustment (such as angle correction of the reflector 12) can be completed without disassembling the entire device, which significantly shortens the production line downtime and improves maintenance efficiency.

[0054] Optionally, the movable plate 15 is connected to the box body 16 via a hinge, slide rail or snap-fit ​​structure to achieve opening and closing. This embodiment does not impose specific limitations on this.

[0055] In some embodiments, a sealing strip is provided between the movable plate 15 and the box body 16, which allows the two to fit tightly together, effectively blocking external dust, moisture or stray light interference, and ensuring the purity of the calibration optical path.

[0056] Optionally, the sealing strip is a silicone gasket.

[0057] Optionally, the mounting base 2 is recessed to form a mounting groove 22 that adapts to the shape of the fisheye doorbell 3.

[0058] It should be noted that the mounting slot 22 is customized with a concave shape according to the three-dimensional contour (such as the curvature of the surface and the height of the lens protrusion) of the fisheye doorbell 3 shell. The physical limit ensures that the device to be calibrated is strictly coaxial with the optical axis of the calibration hole 21, eliminating the deflection or tilting error caused by manual placement.

[0059] In some embodiments, the mounting slot 22 is embedded with a pressure sensor that can detect the doorbell fit in real time and adjust it through indicator light feedback to avoid optical path asymmetry caused by posture deviation.

[0060] It should be noted that some models of the fisheye doorbell 3 are also equipped with a PIR lens, which detects the distance and triggers an alarm. The PIR lens is usually hemispherical and protrudes from the surface of the fisheye doorbell 3.

[0061] In some embodiments, the mounting base 2 is further provided with a lens hole for placing the PIR lens. It is understood that without the lens hole, a groove corresponding to the arc shape of the PIR lens needs to be provided in the mounting slot 22. With the lens hole, the placement can be achieved simply by making the cross-sectional size of the lens hole larger than the maximum cross-sectional size of the PIR lens, which reduces manufacturing costs and improves applicability. It should be noted that when the lens hole is provided, the calibration box 1 also has a through hole of a matching shape to avoid obstruction.

[0062] Optionally, the placement slot 22 has a recessed notch 23 on its periphery to facilitate the removal of the fisheye doorbell 3.

[0063] like Figure 4 As shown, it should be noted that the retrieval notches 23 are symmetrically distributed on both sides of the placement groove 22, and the depth is adapted to the thickness of an adult's finger. Operators can apply force by inserting their fingertips into the retrieval notches 23, and can quickly lift the fisheye doorbell 3 without the need for tools or prying with both hands, thereby improving detection efficiency and making it suitable for scenarios that require batch calibration.

[0064] Optionally, the mounting base 2 is movably connected to the calibration box 1.

[0065] It should be noted that the structure and shape of the fisheye doorbell 3 may be adjusted depending on the model. Therefore, for different models of the fisheye doorbell 3, multiple mounting bases 2 are pre-installed, and multiple mounting bases 2 are provided with mounting slots 22 adapted to different models.

[0066] It is understandable that by replacing different mounting bases 2, different models of fisheye doorbells 3 can be adapted, and the same calibration box 1 can be adapted to multiple fisheye doorbells 3 without replacement.

[0067] like Figure 4 As shown, in some embodiments, the calibration box 1 is provided with a slide rail, and the mounting base 2 is provided with a slide bar adapted to the slide rail, so as to insert the mounting base 2 into the slide rail for fixing;

[0068] Optionally, the slide rail protrudes from the outer surface of the calibration box 1 and has an L-shaped cross-section. When the slide bar is inserted into the slide rail, the slide rail and the calibration box 1 together clamp the slide bar.

[0069] The slide rails are provided in two places, located on opposite sides of the mounting base 2, to restrict the movement of the mounting base 2.

[0070] In other embodiments, the mounting base 2 and the calibration box 1 are connected by a snap-fit.

[0071] Optionally, the cross-sectional size of the verification window 14 is larger than the cross-sectional size of the verification hole 21 and smaller than the cross-sectional size of the mounting base 2. Due to different models, the position and size of the fisheye doorbell 3 lens may change. If the verification window 14 is not replaced accordingly, the verification box 1 may be obstructed when the lens position is adjusted.

[0072] It is understandable that, through the redundant setting of the cross-sectional area of ​​the verification window 14, when the size and position of the lens of the fisheye doorbell 3 change, there will be no obstruction. Furthermore, the mounting base 2 can block the excess gaps, prevent light leakage, and improve applicability.

[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A fisheye panoramic doorbell image center auxiliary verification device, characterized in that, include: A verification box, wherein a verification cavity is provided inside the verification box, and a light-emitting element is provided on the inner side wall of the verification box; A mounting base is provided on the outer side of the calibration box to mount the fisheye doorbell. The mounting base has a calibration hole, which is connected to the calibration cavity through a calibration window on the side of the calibration box. The lens of the fisheye doorbell observes the calibration cavity through the calibration hole. The inner side of the calibration box is equipped with a reflector; The number of reflectors is multiple, and all of them are located around the periphery of the verification cavity. The multiple reflectors together form the verification cavity. The light-emitting element includes an LED light strip, which is disposed around the periphery of the verification window; The calibration box includes a box body and a movable plate. The movable plate is movably connected to the box body, and the movable plate and the box body together form the calibration cavity.

2. The fisheye panoramic doorbell image center auxiliary verification device as described in claim 1, characterized in that, The light-emitting element is located on the inner wall of the calibration box near the mounting base.

3. The fisheye panoramic doorbell image center auxiliary verification device as described in claim 1, characterized in that, The light-emitting element is connected to an adjuster for adjusting the light intensity of the light-emitting element.

4. The fisheye panoramic doorbell image center auxiliary verification device as described in claim 1, characterized in that, The mounting base has a recessed groove that fits the shape of the fisheye doorbell.

5. The fisheye panoramic doorbell image center auxiliary verification device as described in claim 4, characterized in that, The placement slot has a recessed notch on its periphery to facilitate the removal of the fisheye doorbell.

6. The fisheye panoramic doorbell image center auxiliary verification device as described in claim 5, characterized in that, The mounting base is movably connected to the calibration box.

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