Access control equipment

Abstract

The present invention discloses an access control device comprising a housing, an imaging unit, and an illumination unit disposed within the housing. The illumination unit comprises at least one iris fill light association group and at least one iris fill light association group, each iris fill light association group comprising two iris fill light units, wherein the vertical distance between the two iris fill light units is greater than a first threshold, or the horizontal distance between the two iris fill light units is greater than a second threshold. The technical solution of the present invention is intended to improve the success rate of iris recognition.

Description

Technical Field

[0001] The present invention relates to the field of security technology, and in particular to an access control device. Background Art

[0002] Currently, iris recognition is one of the biometric technologies used in access control systems. Due to the dark color of the human eye, to improve the success rate of iris recognition, multiple iris fill lights are typically installed on both sides of the imaging lens. This centralized arrangement of multiple iris fill lights has a small spacing between adjacent iris fill lights. Regardless of the order in which the iris fill lights are activated, the position of the light spot formed by the reflected light beam from the same position in the imaging unit will not shift significantly. This structure can easily cause the light from the iris fill lights to be reflected into the imaging lens by people wearing glasses, forming a light spot in the iris image area that interferes with iris image recognition, resulting in a low success rate in identity recognition. Summary of the Invention

[0003] The main purpose of the present invention is to provide an access control device, aiming to improve the success rate of iris recognition.

[0004] To achieve the above-mentioned object, the access control device proposed in the present invention includes a housing and an imaging unit and a lighting unit provided inside the housing, wherein the lighting unit includes:

[0005] At least one iris fill light association group, the iris fill light association group includes two iris fill light units, a vertical distance between the two iris fill light units is greater than a first threshold, or a horizontal distance between the two iris fill light units is greater than a second threshold.

[0006] In one embodiment of the present invention, two iris fill light units in the same iris fill light association group are connected in parallel, and the two iris fill light units are not turned on at the same time. When one iris fill light unit in the same iris fill light association group is turned on, if there is a light spot in the iris image, the iris fill light unit is turned off and the other iris fill light unit is turned on.

[0007] In one embodiment of the present invention, the iris fill light unit includes a plurality of fill light modules connected in parallel, each of the fill light modules is provided with a sub-beam angle, and the plurality of fill light modules are arranged in sequence along the vertical direction of the shell, so that the sub-beam angles are spliced in sequence to form a main beam angle θ, and the main beam angle θ is greater than the field of view angle of the imaging unit.

[0008] In one embodiment of the present invention, the included angles between the optical axes of the fill light modules and the horizontal line are different.

[0009] In one embodiment of the present invention, in the two iris fill light units of the iris fill light association group, the number of fill light modules in the iris fill light unit located at the top and the number of fill light modules in the iris fill light unit located at the bottom are equal;

[0010] The angle between the optical axis of each fill light module in the top iris fill light unit and the horizontal plane is smaller than the angle between the optical axis of the fill light module at the corresponding position in the bottom iris fill light unit and the horizontal plane.

[0011] In one embodiment of the present invention, the access control device includes two iris fill light association groups, and the two iris fill light units in each of the iris fill light association groups are distributed diagonally.

[0012] In one embodiment of the present invention, in the two iris fill light association groups, the sum of the beam angles of the two iris fill light units at corresponding positions in the two iris fill light association groups in the horizontal direction is greater than the horizontal field of view angle of the imaging unit.

[0013] In one embodiment of the present invention, the fill light module includes:

[0014] a light board fixed in the housing, the light board being provided with a plurality of fixing holes spaced apart in a horizontal direction, and the central axes of the plurality of fixing holes being located at the same height; and

[0015] A plurality of lamp beads are provided, and one of the lamp beads is fixed in one of the fixing holes.

[0016] In one embodiment of the present invention, the iris fill light unit includes:

[0017] A lamp holder is fixed in the housing, and the lamp holder is provided with a plurality of mounting positions, wherein the plurality of mounting positions are sequentially arranged along the vertical direction of the lamp holder;

[0018] A fill light module is arranged in one of the installation positions, and the lamp board is fixedly connected to the lamp holder.

[0019] In one embodiment of the present invention, the imaging unit includes:

[0020] At least one facial imaging lens, disposed in the housing; and

[0021] At least one iris imaging lens is disposed in the housing and below the face imaging lens. The iris imaging lens can also adjust the iris imaging viewing angle through an adjustment mechanism.

[0022] In one embodiment of the present invention, the imaging unit further includes: a reflector, the reflector being disposed between the face imaging lens and the iris imaging lens, the reflective surface of the reflector being disposed toward the optical axis of the iris imaging lens, the reflector being rotatably connected to the housing via the adjustment mechanism;

[0023] Alternatively, the optical axis of the iris imaging lens is parallel to the optical axis of the face imaging lens, and the iris imaging lens is further rotatably connected to the housing via the adjustment mechanism.

[0024] The access control device of the present invention includes a housing, an imaging unit and an illumination unit disposed within the housing. The imaging unit is configured to capture a biometric image of a user. The illumination unit includes at least one iris fill light association group, wherein two iris fill light units in the iris fill light association group are located at different positions within the housing, and the vertical distance between the two iris fill light units is greater than a first threshold, or the horizontal distance between the two iris fill light units is greater than a second threshold. Since the vertical distance between the two iris fill light units is greater than the first threshold, or the horizontal distance between the two iris fill light units is greater than the second threshold, the light spots formed within the imaging unit after the light beams emitted by the two iris fill light units are reflected by lenses at the same position are not significantly separated. That is, the light spots formed within the imaging unit after the two iris fill light units in the same iris fill light association group are reflected by lenses at the same position can be located either inside or outside the red iris image area, respectively. In this manner, simply turning on the fill light that positions the light spot outside the red iris image area effectively prevents interference of the light spot on the iris image, thereby improving the success rate of iris recognition. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of an embodiment of an access control device of the present invention;

[0027] Figure 2 for Figure 1 Exploded view of the structure at A in the middle;

[0028] Figure 3 This is a schematic diagram of the iris fill light unit structure;

[0029] Figure 4 for Figure 3 Exploded diagram of the structure of the middle iris fill light unit;

[0030] Figure 5 This is a distribution diagram of an iris fill light association group in the access control device of the present invention;

[0031] Figure 6 Schematic diagram of the distribution of another iris fill light association group in the access control device of the present invention;

[0032] Figure 7 This is a schematic diagram showing the distribution of two iris fill light association groups of the access control device of the present invention;

[0033] Figure 8 This is a schematic diagram showing the distribution of multiple iris fill light association groups of the access control device of the present invention;

[0034] Figure 9 Schematic diagram of the main beam angle θ in the fill light module of an iris fill light unit;

[0035] Figure 10 Schematic diagram of main beam angle θ obtained by splicing multiple iris fill light units;

[0036] Description of Figure Numbers:

[0037] Label name Label name 100 Access control equipment 251 Light Board 10 case 253 lamp beads 11 front shell 30 Iris imaging lens 13 back shell 40 Facial imaging lens 15 Glass cover 50 reflector 21 Iris fill light unit 60 Adjustment mechanism 23 lamp holder 70 Display 231 Installation position 80 Fingerprint recognition device 25 Fill light module

[0038] 100. Access control device; 10. Housing; 11. Front housing; 13. Back housing; 15. Glass cover; 21. Iris fill light unit; 23. Lamp holder; 231. Mounting position; 25. Fill light module; 251. Light board; 253. Lamp beads; 30. Iris imaging lens; 40. Face imaging lens; 50. Reflector; 60. Adjustment mechanism; 70. Display screen; 80. Fingerprint recognition device.

[0039] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The iris is a thin, flat, circular membrane in the middle layer of the eyeball, located between the cornea and the lens. When viewed from the front, it is the distinctively textured ring between the pupil and the white of the eye. The iris texture can be used for authentication.

[0045] Iris recognition technology is one of the biometric technologies used by access control device 100. Due to the dark color of the human eye, to obtain a clear and complete iris image and improve the success rate of identity recognition, existing solutions typically install multiple high-intensity iris fill lights on both sides of the imaging unit, with the multiple iris fill lights located at the same height. However, these multiple iris fill lights, centralized at the same height, are not user-friendly for users who wear glasses. This is because the lenses will reflect the light emitted by the multiple iris fill lights into the imaging lens, forming a light spot in the iris image area, which interferes with iris image recognition and results in a lower identity recognition success rate.

[0046] Experiments have shown that when a light spot is obstructed in an image, if only the angle of the lighting unit is rotated (i.e., the distance between the lighting unit and the imaging unit remains unchanged), the light spot caused by lens reflection remains present and its position remains unchanged. When a light spot is obstructed in an image, if the user rotates or moves their head, causing the position of the glasses they are wearing to change, or if the lighting unit moves, the light spot position will also move accordingly. In other words, changing the relative positions of the lighting unit, glasses, and imaging unit can effectively remove the light spot.

[0047] Obviously, the goal of access control device 100 is to minimize user interaction, and the imaging unit is a precision system that needs to remain stable. Therefore, the only way to eliminate light spots is to change the relative position between the lighting unit and the glasses.

[0048] Existing solutions also involve adjusting the position of the lighting unit using an adjustment mechanism 60. However, the structural design of this adjustment mechanism 60 is extremely complex, making the access control device 100 bulky and complex. Furthermore, the adjustment mechanism 60 is limited in its range of movement, resulting in poor light spot elimination. Furthermore, the adjustment mechanism 60 takes time to respond, increasing the duration of iris recognition. None of these solutions provide a good user experience.

[0049] The present invention provides an access control device 100 .

[0050] Please refer to Figures 1 to 8 The access control device 100 in one embodiment of the present invention includes a housing 10 and an imaging unit and a lighting unit disposed inside the housing 10. The lighting unit includes:

[0051] There is at least one iris fill light association group, wherein two iris fill light units 21 in the iris fill light association group are distributed on both sides of the imaging unit, and a vertical distance between the two iris fill light units 21 is greater than a first threshold.

[0052] The access control device 100 of the technical solution of the present invention includes a shell 10 and an imaging unit and a lighting unit arranged inside the shell 10. The imaging unit is used to collect the user's biometric image; the lighting unit includes at least one iris fill light association group, and the two iris fill light units 21 in the iris fill light association group are respectively arranged on both sides of the imaging unit, and the two iris fill light units 21 are distributed at different positions of the shell 10, and also meet the requirements that the vertical distance between the two iris fill light units 21 is greater than a first threshold, or the horizontal distance between the two iris fill light units 21 is greater than a second threshold. Among them, since the vertical distance between the two iris fill light units 21 is greater than the first threshold or the horizontal distance between the two iris fill light units 21 is greater than the second threshold, at this time, after the light beams emitted by the two iris fill light units 21 are reflected by the lenses at the same position, the positions of the light spots formed in the imaging unit are not far apart. That is, after the two iris fill light units 21 in the same iris fill light association group are reflected by the lenses at the same position, the light spots formed in the imaging unit can be respectively located inside and outside the red iris image area. In this way, it is sufficient to turn on the fill light that can position the light spot outside the red iris image area. This can effectively avoid the interference of the light spot on the iris image, thereby improving the success rate of iris recognition.

[0053] In one embodiment of the present invention, two iris fill light units 21 in the same iris fill light association group are connected in parallel, and the two iris fill light units 21 are not turned on at the same time. When one iris fill light unit 21 in the same iris fill light association group is turned on, if there is a light spot in the iris image, the iris fill light unit 21 is turned off and the other iris fill light unit 21 is turned on.

[0054] In the technical solution of one embodiment of the present invention, since the two iris fill light units 21 in the same iris fill light association group are connected in parallel and the two iris fill light units 21 are not turned on at the same time, the two iris fill light units 21 can be controlled to be turned on or off separately. When it is necessary to recognize an iris image, one of the two iris fill light units 21 is controlled to be turned on first. At this time, if it is detected that the light beam emitted by the turned-on iris fill light unit 21 forms a light spot within the iris image after being reflected by the lens, the iris fill light unit 21 that was turned on first has interfered with the recognition of the iris image. The solution is to control the iris fill light unit 21 that was turned on first to be turned off, and then turn on the other iris fill light unit 21. At this time, the light spot formed by the light beam emitted by the iris fill light unit 21 that was turned on later after being reflected by the lens can be located outside the iris image. The present application solution arranges two iris fill light units in an iris fill light association group in parallel, and controls the opening or closing of each iris fill light unit 21 separately, so as to effectively avoid the reflected light beam from being concentrated inside the iris image area, effectively avoids the interference of the light spot on the iris image, and improves the success rate of iris recognition.

[0055] In this embodiment, by distributing the two iris fill light units 21 in the iris fill light association group at different positions on the housing 10, with a sufficiently large vertical distance between the two iris fill light units 21, and by separately controlling the opening and closing of the two iris fill light units 21 in the same iris fill light association group, while keeping the user and the imaging unit stationary, the position of the iris fill light unit 21 is effectively moved, thereby moving the light spot reflected by the lens outside the inner side of the iris image area. Compared to existing solutions that use a moving mechanism to move the position of the iris fill light unit 21, the solution of this application is simple in structure and easy to implement.

[0056] Although the present application requires at least two iris fill light units 21 and uses a large number of iris fill light units 21, the cost of setting up multiple iris fill light units 21 in the access control device 100 is still lower than that of using a mobile mechanism. Moreover, setting up more iris fill light units 21 will not make the structure of the access control device 100 too complicated, and its economic benefits are higher.

[0057] The housing 10 serves as a carrier for the imaging unit, lighting unit, and other components. It includes a front shell 11 and a rear shell 13 that are detachably connected by screws or snaps. The front shell 11 and rear shell 13 enclose a housing space within which the imaging unit, lighting unit, and other components of the access control device 100 can be fixedly installed. The front shell 11 also includes a lens window and a fill light window, defining the imaging unit as having a front-to-back orientation. The front end of the imaging unit is positioned toward the lens window of the front shell 11, allowing the optical axis of the imaging unit to pass through the lens window. Correspondingly, the lighting unit is positioned toward the fill light window, allowing the illumination beam emitted by the lighting unit to pass through the fill light window.

[0058] In one embodiment, the access control device 100 may also include other biometric recognition units, such as a fingerprint recognition device, a face recognition unit, or a voice recognition device. The access control device 100 also includes a display screen 70 and a glass cover 15. Typically, the display screen 70 is fixed to the front shell 11 and is located at the bottom of the imaging unit. The display screen 70 is used to display identity information. The lens window, fill light window, and other biometric recognition windows are all located on the periphery of the display screen 70. The glass cover 15 is provided on the outside of the display screen 70. The glass cover 15 can protect the display screen 70 and also make the access control device 100 more ornamental.

[0059] The user usually stands in the center, right in front of the access control device 100, so that the imaging unit can capture the image of the user. In order to adapt to the user's usage habits, the imaging unit is usually centered on the central symmetric plane in the vertical direction of the shell 10, that is, the optical axis of the imaging unit is located on the central symmetric plane in the vertical direction of the shell 10, so that the imaging unit has a suitable shooting angle. In this embodiment, the two iris fill light units 21 in the same iris fill light association group are distributed on both sides of the imaging unit, which means that the two iris fill light units 21 are distributed on both sides of the optical axis of the imaging unit in the horizontal direction. Of course, the present application does not limit the optical axis of the imaging unit to the central symmetric plane in the vertical direction of the shell 10. When there are two symmetrically arranged imaging lenses in the imaging unit, the optical axes of the two imaging lenses can also be arranged close to the central symmetric plane in the vertical direction of the shell 10.

[0060] It can be understood that the imaging unit is usually located roughly at the top position of the shell 10. In this way, the access control device 100 can be installed at a lower position of the wall or door, and even a lower installation position 231 can have a higher shooting angle.

[0061] Please continue to refer to Figure 1 and Figure 2 In one embodiment of the present invention, the imaging unit includes at least one facial imaging lens 40 and at least one iris imaging lens 30. The facial imaging lens 40 is used to capture a facial image of a user to determine the iris position of the identified user. The iris imaging lens 30 accurately identifies the user's iris image based on the iris position determined from the facial image.

[0062] Reference Figure 1 and Figure 2 In one embodiment, two facial imaging lenses 40 are positioned side by side at the same height on the housing 10, with their optical axes parallel to each other and symmetrically positioned on either side of the vertical center plane of symmetry of the housing 10. This allows the two facial imaging lenses 40 to perform facial image recognition on a user from two different locations, accurately determining the user's spatial position and, in turn, precisely positioning the user's iris. This provides an accurate reference for the iris imaging lens 30 to track the iris position, thereby improving the success rate of iris recognition.

[0063] The iris imaging lens 30 is positioned below the facial imaging lens 40. Specifically, the facial imaging lens 40 and the iris imaging lens 30 are spaced apart from each other along the vertical direction of the housing 10, from top to bottom. This improves the rationality of the imaging unit layout in the access control device 100. In one embodiment, when there is only one iris imaging lens 30, a larger iris imaging lens 30 should be selected to ensure the recognition distance of the iris imaging lens 30. However, a larger iris imaging lens 30 not only has a larger diameter but also has a larger dimension along the optical axis. To avoid a thicker housing 10 of the access control device 100, the optical axis of the iris imaging lens 30 needs to be arranged parallel to the vertical direction of the housing 10. A reflector 50 is also required at the front end of the optical axis of the iris imaging lens 30. The reflective surface of the reflector 50 reflects the user's iris image within the field of view of the iris imaging lens 30. Specifically, the optical axis of the iris imaging lens 30 is set toward the top of the housing 10, and the reflector 50 is located between the iris imaging lens 30 and the face imaging lens 40, so that the reflector 50 can face the face of the user to be identified, so as to better reflect the user's iris image into the field of view of the iris imaging lens 30.

[0064] To better track the user's iris position, the reflector 50 is rotatably connected to the housing 10 via an adjustment mechanism 60. Specifically, the adjustment mechanism 60 includes a horizontal rotation axis and a vertical rotation axis, both of which are connected to the reflector 50. This allows the reflector 50 to rotate or synergize with each other in the horizontal and vertical directions, ensuring the wide field of view of the iris imaging lens 30 and the ability to recognize a complete iris image. It will be understood that the horizontal rotation axis extends along the width of the housing 10, while the vertical rotation axis extends along the height of the housing 10.

[0065] In another embodiment, when there are two iris imaging lenses 30, two smaller iris imaging lenses 30 can be selected. The two smaller iris imaging lenses 30 can work together to ensure the iris image recognition distance, allowing users to obtain clear iris images even at a greater distance from the access control device 100, thereby enhancing the flexibility of iris recognition. Due to the smaller size of the iris imaging lenses 30, the optical axes of both iris imaging lenses 30 can be set parallel to the optical axis of the facial imaging lens 40. Since the optical axes of both iris imaging lenses 30 are parallel to the optical axis of the facial imaging lens 40, the iris imaging lenses 30 no longer require a reflector 50 to recognize iris images, simplifying the structure of the access control device 100. To facilitate iris tracking, the two smaller iris imaging lenses 30 can be integrated into a single mounting bracket, which is rotatably connected to the housing 10 via an adjustment mechanism 60 to increase the field of view of the iris imaging lenses 30. Similarly, the adjustment mechanism 60 in this embodiment includes a horizontal rotation axis and a vertical rotation axis, both of which are connected to a fixed base (not shown). This allows the adjustment mechanism 60, through the fixed base, to simultaneously drive the two smaller iris imaging lenses 30 to rotate or work in tandem with each other in the horizontal and vertical directions, thereby ensuring the wide field of view of the iris imaging lenses 30 and ensuring that a complete iris image can be recognized. It will be understood that the horizontal rotation axis extends along the width of the housing 10, while the vertical rotation axis extends along the height of the housing 10.

[0066] Furthermore, in one embodiment, the lighting unit includes a portrait fill light unit and an iris fill light unit 21. The portrait fill light unit uses an ordinary lighting lamp to increase the brightness of the user's face and its surroundings, so that the facial imaging unit can collect the user's facial image. The portrait fill light unit is set at an appropriate position of the shell 10, and the portrait fill light unit is not limited here. The iris fill light unit 21 can emit a high-intensity lighting beam, such as infrared light. The iris fill light unit 21 can ensure that the iris imaging lens 30 can collect a complete and clear iris image to improve the success rate of identity recognition. The two iris fill light units 21 in an iris fill light association group are respectively set on both sides of the imaging unit, and the two iris fill light units 21 are distributed at different heights of the shell 10, and the vertical distance between the two iris fill light units 21 is greater than the first threshold. In this way, the two iris fill light units 21 can emit light beams to the user from different heights. The light beam emitted by one of the iris fill light units 21 can interfere with the light beam reflected by the other iris fill light unit 21 through the lenses worn by the user, so that the reflected part of the light in the imaging unit is offset, thereby avoiding the formation of a light spot in the area of the iris image in the reflected light beam, effectively eliminating the interference of the light spot on iris imaging, and improving the success rate of identity recognition.

[0067] In this embodiment, the first threshold is 6 cm. The vertical distance between two iris fill light units 21 in the same iris fill light association group is greater than 6 cm. For example, the vertical distance between two iris fill light units 21 in the same iris fill light association group can be 6 cm, 8 cm, 10 cm, 12 cm, 15 cm, 18 cm, 25 cm, 30 cm, 40 cm, etc. The larger the vertical distance between the two iris fill light units 21, the greater the position variation of the light spot reflected from the same position to the imaging unit, and the better the effect of eliminating the light plate in the iris image area. The vertical distance between two iris fill light units 21 in the same iris fill light association group can be reasonably arranged according to the size of the housing 10 of the access control device 100, and no specific examples are given here.

[0068] Understandably, in an experiment where the iris fill light unit 21 is located at the same height as the imaging unit, the light spot formed by the light beam reflected from the lens is located inside the iris image area. At this point, while keeping the user's position (i.e., the position of the lenses worn by the user) and the imaging unit unchanged, the iris fill light unit 21 is moved in the same vertical direction and the position of the light spot is observed:

[0069] When the iris fill light unit 21 is moved downward by a distance of 1 cm, it is observed that the light spot is located in the middle of the iris image area;

[0070] The iris fill light unit 21 is further moved downward by 1 cm. At this time, it is observed that the light spot is still located inside the iris image area.

[0071] The iris fill light unit 21 is further moved downward by 2 cm. At this time, it is observed that the light spot is located at the edge of the iris image area.

[0072] The iris fill light unit 21 is further moved downward by 2 cm. At this time, it is observed that the position of the light spot is located outside the iris image area.

[0073] In summary, after multiple experiments, it can be found that when the iris fill light unit 21 moves downward from the initial position by a distance greater than 6 cm, it can be found that the final light spot position and the initial light spot position will have a considerable movement. In this way, by changing the position of the iris fill light unit 21, the light spot can be moved from the inner side of the iris image area to the outer side of the iris area, effectively avoiding the interference of the light spot on the iris image and improving the success rate of iris recognition.

[0074] It can be understood that, among the two iris fill light units 21 in the same iris fill light association group, one of the iris fill light units 21 can be located at the same height as the imaging unit of the shell 10. For example, when the imaging unit is located at the top position of the shell 10, the iris fill light unit 21 located at the top can be located at the same height as the imaging unit of the shell 10.

[0075] In another embodiment, the iris fill light unit 21 may not be at the same height as the imaging unit. For example, when the imaging unit is located in the middle of the housing 10, the two iris fill light units 21 in the same iris fill light association group may be respectively distributed on both sides of the optical axis of the imaging unit in the vertical direction. This is sufficient as long as the vertical distance between the two iris fill light units 21 meets the required movement of the light spot. Since the position of the iris fill light unit 21 in this embodiment is fixed, the position of the iris fill light unit 21 cannot be moved by a moving mechanism. Instead, the initial position of the iris fill light unit 21 is "moved" by controlling the opening or closing of the two iris fill light units 21 at different positions. This effectively avoids interference with the iris image caused by the light spot formed by the reflection of the light beam from the same position, thereby improving the success rate of iris recognition.

[0076] In one embodiment of the present invention, the horizontal distance between two iris fill light units 21 in an iris fill light association group is greater than a second threshold. In this embodiment, in addition to the vertical distance between two iris fill light units 21 in the same iris fill light association group being greater than the first threshold, the horizontal distance between the two iris fill light units 21 is also greater than a second threshold. The second threshold is 12 cm. For example, the horizontal distance between the two iris fill light units 21 can be 12 cm, 13 cm, 15 cm, 18 cm, 20 cm, 22 cm, 25 cm, and so on. The horizontal distance between two iris fill light units 21 in the same iris fill light association group can also be reasonably arranged according to the size of the housing 10 of the access control device 100.

[0077] It can be understood that, based on the same principle as the previous embodiment, when the distance between the two iris fill light units 21 is far enough, the two iris fill light units 21 are controlled to be turned on or off respectively to achieve the "movement" of the initial position of the iris fill light unit 21, so that the positions of the two light spots formed by the light beam reflected from the same position in the imaging unit have a considerable movement, so as to effectively avoid the reflected light beams from being concentrated inside the iris image area, effectively avoid the interference of the light spot on the iris image, and improve the success rate of iris recognition.

[0078] Please continue to refer to Figure 5 and Figure 6In one embodiment of the present invention, when the access control device 100 has only one iris fill light association group, the two iris fill light units 21 in the iris fill light association group are distributed diagonally, for example Figure 5 A iris fill light unit 21 and B iris fill light unit 21, or Figure 6 The C iris fill light unit 21 and the D iris fill light unit 21 in the image.

[0079] Please continue to refer to Figure 7 In one embodiment of the present invention, the access control device 100 includes two iris fill light association groups. The two iris fill light units 21 in each iris fill light association group are diagonally arranged. Iris fill light unit A 21 and iris fill light unit B 21 form one iris fill light association group, while iris fill light unit C 21 and iris fill light unit D 21 form another iris fill light association group.

[0080] By simultaneously providing two iris fill-light association groups, four iris fill-light units 21 are distributed around the imaging unit. Thus, the four iris fill-light units 21 form a distributed lighting layout around the imaging unit, creating four effective fill-light areas around the imaging unit, effectively improving the recognition range and recognition distance of the imaging unit. This also effectively avoids the formation of light spots inside the iris image area due to light beams reflected from glasses, thereby improving the success rate of iris recognition. Thus, regardless of whether the user stands to the right or left of the access control device 100, or regardless of the height differences between the users, as long as the user is within the recognition distance of the iris imaging lens, the iris fill-light units 21 can be controlled to turn on or off to meet the brightness requirements for iris image recognition at different locations, thereby improving the flexibility of the access control device 100.

[0081] For further information, please refer to Figure 8 In a possible embodiment, the two iris fill light association groups may be symmetrically arranged on both sides of the imaging unit. Of course, the two iris fill light association groups may also be arranged arbitrarily as long as the vertical distance and horizontal distance are satisfied.

[0082] Please refer to Figure 3 and Figure 4 ,as well as Figure 8In another possible embodiment, the number of iris fill light association groups may be three, four, etc. The number of iris fill light association groups may be reasonably arranged according to the specific shape of the housing 10. The principle of arrangement is to reduce the number of iris fill light units 21 while meeting the lighting requirements of various positions within the field of view of the imaging unit, thereby reducing the manufacturing cost of the access control device 100. It should be noted that when there are multiple iris fill light association groups, the vertical distance between each iris fill light unit 21 should be greater than 5 cm. This arrangement ensures that the spatial distribution of each iris fill light unit 21 on the housing 10 is reasonable, thereby avoiding the need for an excessive number of iris fill light units 21 on the housing 10 and saving manufacturing costs.

[0083] Please refer to Figures 5 to 8 In one specific embodiment, the access control device 100 includes a 10.1-inch display screen 70. Both the facial imaging lens 40 and the iris imaging lens 30 are located at the top of the display screen 70. A fingerprint recognition device 80 is also located at the bottom of the screen. Multiple iris fill-light units 21 are distributed around the display screen 70. These units 21 form a distributed lighting arrangement around the imaging unit. This creates multiple effective fill-light areas around the imaging unit, ensuring the imaging unit's recognition range and distance. The spatial layout of the distributed lighting created by the multiple iris fill-light units 21 can meet the fill-light requirements of users at different positions and heights within the iris imaging lens's field of view, effectively preventing the formation of light spots within the iris image area caused by light reflected from the user's glasses. This layout not only fully utilizes the surface space of the housing 10 but also improves the success rate of iris recognition. Furthermore, this layout eliminates the need to separate the lighting unit from the imaging unit, facilitating the configuration of the access control device 100 as an all-in-one device.

[0084] Please continue to refer to Figures 7 to 10 In one embodiment of the present invention, the iris fill light unit 21 includes a plurality of fill light modules 25 connected in parallel, each fill light module 25 is provided with a sub-beam angle, and the plurality of fill light modules 25 are arranged in sequence along the vertical direction of the housing 10, so that the sub-beam angles are sequentially spliced to form a main beam angle θ, and the main beam angle θ is greater than the field of view angle of the imaging unit.

[0085] In this embodiment, multiple fill light modules 25 within a single iris fill light unit 21 are connected in parallel, allowing each fill light module 25 to be controlled independently to achieve energy conservation. Specifically, the fill light modules 25 in different locations within the iris fill light unit 21 can be controlled to be turned on or off based on the user's height, distance, and iris position. This improves fill light flexibility and makes the configuration of the iris fill light unit 21 more user-friendly. This reduces power consumption while meeting the brightness requirements for successful recognition by the iris imaging lens 30.

[0086] It should be noted that multiple fill light modules 25 are arranged in sequence along the vertical direction of the shell 10, and the vertical width of the main beam angle θ formed by splicing the sub-beam angles of each fill light module 25 is greater than the field of view angle of the iris imaging unit in the vertical direction, so as to ensure that the iris fill light unit 21 can supplement the light source within the field of view angle range of the iris imaging unit, so as to improve the success rate of iris imaging unit recognition.

[0087] In one embodiment, the sub-beam angles of each fill light module 25 in the same iris fill light unit 21 can be identical, that is, the sub-beam angles of each fill light module 25 in the iris fill light unit 21 are identical. For example, in one embodiment, the field of view of the iris imaging lens selected is 60°, and the sub-beam angles of the three fill light modules 25 in the same iris fill light unit 21 are all 27°. After the three fill light modules 25 are spliced together, the main beam angle θ is 71°, which is greater than the field of view of the iris imaging lens and can meet the fill light requirements at any position within the field of view of the iris imaging lens. Of course, in another embodiment, the sub-beam angles of the three fill light modules 25 in the same iris fill light unit 21 can also be other angles, for example, the sub-beam angles of the three fill light modules 25 in the same iris fill light unit 21 can be 23°, 30°, 25°, etc. respectively; for another example, the sub-beam angles of the two fill light modules 25 in the same iris fill light unit 21 can be 35°, 40°, etc. respectively. As long as the main beam angle θ obtained by splicing multiple fill light modules 25 in the same iris fill light unit 21 is greater than the field of view angle of the iris imaging lens, the fill light requirement at any position within the field of view angle range of the iris imaging lens can be met, and the value of the sub-beam angle of each fill light module 25 is not limited here.

[0088] In other embodiments, the beam angles of each fill light module 25 in the same iris fill light unit 21 may also be different, and different sub-beam angles can be selected according to the positions of each fill light module 25. For example, the fill light module 25 located at the top can use a larger sub-beam angle, and the fill light module 25 located at the bottom can use a smaller sub-beam angle. As long as the main beam angle θ formed by splicing the various sub-beam angles of multiple fill light modules 25 in the same iris fill light unit 21 is greater than the field of view angle of the iris imaging lens 30, the sub-beam angles of each fill light module 25 are not limited here.

[0089] Please refer to Figure 9 In one embodiment of the present invention, the angles between the optical axes of the fill light modules 25 and the horizontal line are different.

[0090] In this embodiment, the optical axis refers to the location of the optical axis of the maximum light intensity of each fill light module 25. By setting different angles between the optical axis of each fill light module 25 and the horizontal line, when there are two fill light modules 25 in the iris fill light unit 21, the angle formed between the optical axis of the fill light module 25 located at the top and the horizontal plane is greater than the angle formed between the optical axis of the fill light module 25 located at the bottom and the horizontal plane, thereby providing the iris fill light unit 21 with a more flexible fill light range.

[0091] In another embodiment, the iris fill light unit 21 may also have three fill light modules 25. Please refer to Figure P. In one embodiment of the present invention, the iris fill light unit 21 includes three fill light modules 25, wherein the three fill light modules 25 are marked as A1, A3, and A2 from top to bottom, and the angle between the optical axis of A1 and the horizontal plane is θ1 (not shown in the figure), the angle between the optical axis of A2 and the horizontal plane is θ2 (not shown in the figure), and the angle between the optical axis of A3 and the horizontal plane is θ3 (not shown in the figure).

[0092] In one embodiment, the angle θ1 between the optical axis of A1 and the horizontal plane is 33.5°, the angle θ2 between the optical axis of A3 and the horizontal plane is 8.5°, and the angle θ1 between the optical axis of A2 and the horizontal plane is 16.5°. In another possible embodiment, the angle θ1 between the optical axis of A1 and the horizontal plane is 28.5°, the angle θ3 between the optical axis of A3 and the horizontal plane is 3.5°, and the angle θ2 between the optical axis of A2 and the horizontal plane is 21.5°. The angle values listed above are only used to illustrate that the installation angle of the fill light module 25 can be reasonably set according to the sub-beam angle of the fill light module 25 and the position of the fill light module 25 to achieve a better fill light effect.

[0093] It should be noted that by providing multiple fill light modules 25 distributed in the vertical direction in each iris fill light unit 21, during the iris recognition process, the iris position of the human eye can be tracked by the facial imaging lens 40 first, and then the fill light module 25 at the corresponding position can be turned on according to the position of the iris, so as to reduce the power consumption of the iris fill light unit 21 while meeting the brightness requirement for successful recognition by the iris imaging lens 30.

[0094] The following describes the principle of reducing the power consumption of the iris fill-light unit 21 by using three fill-light modules 25 (A1, A3, and A23) vertically distributed within each iris fill-light unit 21 as an example. For example, when User A, who is 1.8 meters tall, User B, who is 1.65 meters tall, and User C, who is 1.50 meters tall, stand in the same position in front of the access control device 100, the facial imaging lens 40 determines that User A's iris is at a higher position. In this case, fill-light module 25A1 can be turned on, while fill-light modules 25A2 and A3 can be turned off. After the facial imaging lens 40 determines the position of User B's iris, fill-light modules 25A1 and A2 can be turned off, while fill-light module 25A3 can be turned on. After the facial imaging lens 40 determines the position of User C's iris, fill-light modules 25A1 and A3 can be turned off, while fill-light module 25A2 can be turned on.

[0095] Please refer to Figure 9 and 10 In one embodiment of the present invention, among the two iris fill light units 21 of the iris fill light association group, the number of fill light modules 25 in the top iris fill light unit 21 and the number of fill light modules 25 in the bottom iris fill light unit 21 are equal; and the angle between the optical axis of each fill light module 25 in the top iris fill light unit 21 and the horizontal plane is smaller than the angle between the optical axis of the fill light module 25 at the corresponding position in the bottom iris fill light unit 21 and the horizontal plane.

[0096] In the technical solution of this embodiment, the two iris fill light units 21 in the same iris fill light association group have an equal number of fill light modules 25, which simplifies the structure of the iris fill light units 21. Furthermore, by separately designing the angles of the fill light modules 25 at corresponding positions in the two iris fill light units 21, the fill light modules 25 in the two iris fill light units 21 can better fill light the user's iris, thereby improving the recognition success rate of the iris imaging lens 30.

[0097] It is understandable that the number of fill light modules 25 in the two iris fill light units 21 of the same iris fill light association group may also be unequal, and can be reasonably designed according to actual needs, which is not limited here.

[0098] Please refer to Figure 9For example, in one embodiment, the two iris fill light units 21 in one iris fill light association group each include three fill light modules 25. Figure 9 On the left is a schematic diagram of the three fill light modules 25 located at the top iris fill light unit 21. The three fill light modules 25 are marked A1, A3, and A2 from top to bottom. The angle between the optical axis of A1 and the horizontal plane is θ1, which is 28.5°, the angle between the optical axis of A2 and the horizontal plane is θ1, which is 3.5°, and the angle between the optical axis of A1 and the horizontal plane is θ1, which is 21.5°.

[0099] Figure 9 On the left is a schematic diagram of the three fill light modules 25 located in the bottom iris fill light unit 21. The three fill light modules 25 are labeled B1, B3, and B2 from top to bottom. The angle θ1 between the optical axis of B1 and the horizontal plane is 33.5°, the angle θ1 between the optical axis of B2 and the horizontal plane is 8.5°, and the angle θ1 between the optical axis of B1 and the horizontal plane is 28.5°. In this way, the three fill light modules 25 located in the bottom iris fill light unit 21 are slightly tilted upward relative to the fill light modules 25 located in the corresponding positions of the top iris fill light unit 21. This ensures that the light beams of each fill light module 25 in the bottom iris fill light unit 21 are projected upwardly at an angle into the user's iris area, ensuring the fill light effect and improving the recognition success rate of the iris imaging lens 30.

[0100] Please refer to Figure 10 In one embodiment of the present invention, in two iris fill light association groups, the sum of the beam angles of the two iris fill light units 21 at corresponding positions in the horizontal direction is greater than the horizontal field of view angle of the imaging unit. In this embodiment, in two iris fill light association groups, the angle formed by the horizontal splicing of the beam angles of the two iris fill light units 21 at the same height is θ, which is also greater than the horizontal field of view angle of the iris imaging lens 30. In this way, regardless of whether the user is standing to the left or to the right of the access control device 100, the two iris fill light units 21 can meet the fill light needs of users at various positions within the field of view of the iris imaging lens, thereby improving the recognition success rate of the iris imaging lens 30.

[0101] Please refer to Figures 2 to 4 In one embodiment of the present invention, the fill light module 25 includes:

[0102] The lamp board 251 and multiple lamp beads 253 are fixed in the shell 10. The lamp board 251 is provided with multiple fixing holes (not shown in the figure) arranged at intervals along the horizontal direction, and the central axes of the multiple fixing holes are located at the same height; one lamp bead 253 is fixed in one fixing hole.

[0103] In this embodiment, the lamp board 251 can be directly fixed on the housing 10. In this case, a structure for mounting and fixing the lamp board 251 is correspondingly formed on the housing 10. In this case, mounting surfaces (not shown in the figure) are formed on the housing 10 and arranged in sequence along the vertical direction. Each lamp board 251 is fitted with the mounting surface. It is understandable that the mounting surface forms different angles with the horizontal plane so that after each lamp board 251 is fitted with the mounting surface, the lamp beads 253 installed in the fixing hole can meet the preset angle requirements. It is understandable that the lamp board 251 can be fixed to the housing 10 or the lamp holder 23 by screws, and the lamp board 251 can also be fixed to the housing 10 or the lamp holder 23 by snap-fitting. The fixing method is not limited here.

[0104] The lamp beads 253 are LEDs, and the number of LEDs in each fill light module 25 can be adjusted according to their radiant flux. For example, when the LED radiant flux of the lamp beads 253 is low, two or more LEDs need to be set at the same time. If the LED radiant flux of the lamp beads 253 is high, only one LED may be needed to meet the required fill light requirements.

[0105] In another embodiment, the light board 251 can also be indirectly fixed to the housing 10 through the lamp holder 23. In this case, a plurality of mounting positions 231 are correspondingly provided on the lamp holder 23. The mounting positions 231 here can be installed with inclined surfaces or structures such as mounting grooves, as long as the light board 251 can be fixed and the lamp beads 253 installed in the fixing holes meet the preset angle requirements. The mounting seat and the housing 10 can be fixed by screws or snaps. The setting of the mounting seat can make each iris fill light unit 21 modular, so as to facilitate the assembly of the iris fill light unit 21 and improve efficiency.

[0106] In a specific embodiment, this solution uses an 8MP image sensor with a 2μm pixel size, an image size of 3840*2160, a 3x optical zoom periscope imaging system, a focal length range of 12mm-36mm, an aperture of 2.0, and an imaging system field of view angle range of 60°, specifically set to 40° above the horizontal line and 20° below the horizontal line. Each fill light module in the iris fill light unit 21 uses two LED lamp beads with a sub-beam angle of 27°, and the display screen 70 is a 10.1-inch touch screen. It should be noted that this solution is not limited to the parameters described above in this example, and various parameters can be adjusted to meet the requirements of different application scenarios.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. An access control device, characterized in that: The device comprises a housing, an imaging unit and an illumination unit arranged inside the housing, wherein the illumination unit comprises: At least one iris fill light association group, the iris fill light association group including two iris fill light units, the vertical distance between the two iris fill light units being greater than a first threshold or the horizontal distance between the two iris fill light units being greater than a second threshold; the two iris fill light units in the same iris fill light association group being connected in parallel, the two iris fill light units being turned on at different times, and when one of the iris fill light units in the same iris fill light association group is turned on, if there is a light spot in the iris image, the iris fill light unit is turned off and the other iris fill light unit is turned on; Among them, the iris fill light unit includes multiple fill light modules connected in parallel, which supports controlling the opening or closing of fill light modules in different positions according to the user's height, distance, and determined iris position. Each of the fill light modules is provided with a sub-beam angle, and multiple fill light modules are arranged in sequence along the vertical direction of the shell, so that each sub-beam angle is spliced in sequence to form a main beam angle θ, and the main beam angle θ is greater than the field of view angle of the imaging unit; the angle between the optical axis of each fill light module and the horizontal line is different.

2. The access control device according to claim 1, wherein: In the two iris fill light units of the iris fill light association group, the number of fill light modules in the iris fill light unit located at the top and the number of fill light modules in the iris fill light unit located at the bottom are equal; The angle between the optical axis of each fill light module in the top iris fill light unit and the horizontal plane is smaller than the angle between the optical axis of the fill light module at the corresponding position in the bottom iris fill light unit and the horizontal plane.

3. The access control device according to claim 1, wherein: The access control device includes two iris fill light association groups, and the two iris fill light units in each iris fill light association group are distributed diagonally.

4. The access control device according to claim 3, characterized in that: In two of the iris fill light associated groups, a sum of the beam angles of the two iris fill light units at corresponding positions in the horizontal direction is greater than a horizontal field of view angle of the imaging unit.

5. The access control device according to claim 1, wherein: The fill light module includes: a light board fixed in the housing, the light board being provided with a plurality of fixing holes spaced apart in a horizontal direction, and the central axes of the plurality of fixing holes being located at the same height; and A plurality of lamp beads are provided, and one of the lamp beads is fixed in one of the fixing holes.

6. The access control device according to claim 5, characterized in that: The iris fill light unit includes: A lamp holder is fixed in the housing, and the lamp holder is provided with a plurality of mounting positions, wherein the plurality of mounting positions are sequentially arranged along the vertical direction of the lamp holder; A fill light module is arranged in one of the installation positions, and the lamp board is fixedly connected to the lamp holder.

7. The access control device according to any one of claims 1 to 6, characterized in that: The imaging unit comprises: At least one facial imaging lens, disposed in the housing; and At least one iris imaging lens is disposed in the housing and below the face imaging lens. The iris imaging lens can also adjust the iris imaging viewing angle through an adjustment mechanism.

8. The access control device according to claim 7, characterized in that: The imaging unit further includes: a reflector, the reflector being disposed between the face imaging lens and the iris imaging lens, the reflective surface of the reflector being disposed toward the optical axis of the iris imaging lens, the reflector being rotatably connected to the housing via the adjustment mechanism; Alternatively, the optical axis of the iris imaging lens is parallel to the optical axis of the face imaging lens, and the iris imaging lens is further rotatably connected to the housing via the adjustment mechanism.

Images