Image acquisition device and recognition equipment

Abstract

This application discloses an image acquisition device and a recognition device, belonging to the field of biometric technology. The image acquisition device includes: a driving component, a lens component, and an imaging element; the lens component is located on the light-receiving side of the imaging element; the lens component is connected to the driving component, which drives the lens component to move relative to the imaging element; the lens component has at least a first position and a second position; in the first position, light passes through the lens component and forms a first image on the imaging element; in the second position, light passes through the lens component and forms a second image on the imaging element. This application utilizes the relative position information of the lens component and the imaging element to optically encrypt the image, thus encrypting and hiding the biometric information in the image, which helps to improve the security of the recognition device.

Description

Technical Field

[0001] This application relates to the field of biometric technology, and in particular to an image acquisition device and recognition equipment. Background Technology

[0002] In related technologies, palm biometric identification devices that use traditional optical solutions typically acquire conventional palm biometric images. These images can be directly used to identify palm biometric features, thereby reconstructing or restoring a prosthesis. This can deceive the identification device and pose a significant risk to the user's financial security. Utility Model Content

[0003] This application provides an image acquisition device and a recognition device that can solve the problem that conventional imaging images acquired by recognition devices are easily restored or reconstructed into prostheses, posing a security risk.

[0004] The technical solution is as follows:

[0005] On the one hand, an image acquisition device is provided, the image acquisition device comprising: a driving component, a lens component, and an imaging element;

[0006] The lens assembly is located on the light-inlet side of the imaging element;

[0007] The lens assembly is connected to the driving assembly, and the driving assembly is used to drive the lens assembly to move relative to the imaging element;

[0008] The lens assembly has at least a first position and a second position;

[0009] In the first position, light passes through the lens assembly and forms a first image on the imaging element; in the second position, the light passes through the lens assembly and forms a second image on the imaging element.

[0010] On the other hand, an identification device is provided, which includes the image acquisition device described in this application.

[0011] The beneficial effects of the technical solution provided in this application include at least the following:

[0012] The image acquisition device of this application allows the lens assembly to move relative to the imaging element via a driving component. When positioned at different locations, the lens assembly can form different first or second images on the imaging element. The content of these first and second images has a one-to-one mapping relationship with the relative positions of the lens assembly and the imaging element, and is not a conventional image. Without knowing the relative position information of the lens assembly and the imaging element, it is basically impossible to accurately identify the biometric information of the palm, let alone recover or restore the prosthesis. Thus, the relative position information of the lens assembly and the imaging element is used to optically encrypt the image, and the biometric information in the image is encrypted and hidden, which helps to improve the security of the recognition device. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the image acquisition device provided in the embodiments of this application;

[0015] Figure 2 This is a schematic diagram of the image acquisition device provided in the embodiments of this application at a first position;

[0016] Figure 3 This is a schematic diagram of the first image of the image acquisition device provided in the embodiments of this application;

[0017] Figure 4 This is a schematic diagram of the image acquisition device provided in the embodiments of this application at the second position;

[0018] Figure 5 This is a schematic diagram of the second image of the image acquisition device provided in the embodiments of this application;

[0019] Figure 6 This is a schematic diagram of the image acquisition device provided in the embodiments of this application in the third position;

[0020] Figure 7 This is a schematic diagram of a third image from the image acquisition device provided in the embodiments of this application;

[0021] Figure 8 This is a schematic diagram of the image acquisition device provided in the embodiment of this application at the fourth position;

[0022] Figure 9 This is a schematic diagram of the fourth image of the image acquisition device provided in the embodiments of this application;

[0023] Figure 10 This is a schematic diagram of the image acquisition device provided in the embodiment of this application at the fifth position;

[0024] Figure 11 This is a schematic diagram of the fifth image of the image acquisition device provided in the embodiments of this application;

[0025] Figure 12 This is a schematic diagram of the nanostructure of the image acquisition device provided in the embodiments of this application;

[0026] Figure 13 This is a schematic diagram of the structure of an image acquisition device provided in another embodiment of this application;

[0027] Figure 14 This is a schematic diagram of the structure of the identification device provided in the embodiments of this application.

[0028] The reference numerals in the figure are respectively:

[0029] 1. Driver components;

[0030] 2. Lens assembly;

[0031] 21. Metasurface lens; 211. Nanostructure; 211a. Substrate; 211b. Nanomonomer;

[0032] 3. Imaging element;

[0033] 4. Control unit;

[0034] 5. Key mapping unit;

[0035] 6. Fill light assembly;

[0036] 7. Shell. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0038] It should be understood that the directional terms used in the embodiments of this application, such as "upper," "lower," "top," "bottom," "front," "rear," and "side," are based on the arrangement orientation of the interface device. Specifically, the orientation of the first housing is considered "top" or "upper," the orientation of the second housing is considered "bottom" or "lower," the portion between the top and bottom is considered "side," the orientation of the interface end is considered "front," and the orientation opposite to "front" is considered "rear." The use of these directional terms in the embodiments of this application is merely for the purpose of more clearly describing the relationships between structures, and not for describing absolute orientations; therefore, they should not be construed as limitations on this application.

[0039] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0041] On the one hand, combined with Figures 1 to 5 As shown, this embodiment provides an image acquisition device, which includes: a driving component 1, a lens component 2, and an imaging element 3.

[0042] The lens assembly 2 is located on the light-inlet side of the imaging element 3; the lens assembly 2 is connected to the drive assembly 1, which is used to drive the lens assembly 2 to move relative to the imaging element 3.

[0043] The lens assembly 2 has at least a first position and a second position.

[0044] In the first position, light passes through the lens assembly 2 and forms a first image on the imaging element 3; in the second position, light passes through the lens assembly 2 and forms a second image on the imaging element 3.

[0045] In this embodiment of the image acquisition device, the lens assembly 2 can move relative to the imaging element 3 by relying on the driving assembly 1. When it is in different positions, the lens assembly 2 can form different first images or second images on the imaging element 3. The content presented by these first and second images has a one-to-one mapping relationship with the relative positions of the lens assembly 2 and the imaging element 3. They are not conventional images. Without knowing the relative position information of the lens assembly 2 and the imaging element 3, it is basically impossible to accurately identify the biometric information of the palm, let alone recover or restore the prosthesis. Thus, the image is optically encrypted using the relative position information of the lens assembly 2 and the imaging element 3. The biometric information in the image is encrypted and hidden, which helps to improve the security of the recognition device.

[0046] In some possible implementations, the first position of the lens assembly 2 is as follows: Figure 2 As shown, the second position of lens assembly 2 is as follows Figure 4 As shown, in the first position, the distance between the lens assembly 2 and the imaging element 3 is L1, and in the second position, the distance between the lens assembly 2 and the imaging element 3 is L2, where L2 is greater than L1.

[0047] In some possible implementations, the position of the lens assembly 2, in addition to the first position and the second position, may also have, for example... Figure 6 The third position shown, as Figure 8 The fourth position shown and as Figure 10 The fifth position is shown. In the third position, light passes through the lens assembly 2 and forms a third image on the imaging element 3, as shown. Figure 7 As shown; in the fourth position, light passes through the lens assembly 2 and forms a fourth image on the imaging element 3, as... Figure 9 As shown; in the fifth position, light passes through the lens assembly 2 and forms a fifth image on the imaging element 3, as... Figure 11 As shown.

[0048] In the image acquisition device of this embodiment, when the lens assembly 2 moves relative to the imaging element 3, the relative position parameters such as the distance between the lens assembly 2 and the imaging element 3, and the projection position of the lens assembly 2 on the imaging element 3, can all be changed. By changing these relative position parameters, the light passing through the lens assembly 2 can present different images on the imaging element 3, such as... Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 As shown.

[0049] Each different image can be used to extract different image feature information. This image feature information not only does not directly expose the biometric information of the palm, but can also be combined with relative position parameters to achieve more secure, reliable and multi-level biometric verification, thereby helping to further improve the security of recognition devices.

[0050] In some possible implementations, the first image and the second image include palm print information and palm vein information, respectively.

[0051] Palm vein information is one type of vein information; palm veins refer to the venous system within the human palm. When using palm veins for identity authentication, the system acquires the image features of the palm veins, features that only exist in a living hand. In this system, vein image features cannot be obtained from a non-living hand, making identification impossible and thus preventing forgery.

[0052] Palm print information refers to the various lines on the surface of the palm, from the fingertips to the wrist. Many features can be used for identification, such as main lines, wrinkles, fine textures, ridges, and bifurcation points. The morphology of palm prints is controlled by genes; even if the epidermis peels away for some reason, the newly formed palm print lines retain the original structure. Everyone's palm print lines are different; even twins will only have similar, not identical, palm prints. By utilizing the features of palm print lines, dots, textures, and geometric shapes, a person's identity can be determined.

[0053] Dual-modal identity recognition using palm vein and palm print information offers advantages such as simple operation and high security.

[0054] In some possible implementations, the imaging element 3 includes at least one of a CCD (Charge Coupled Device) and a CMOS (Complementary Metal Oxide Semiconductor) device.

[0055] Combination Figure 2 and Figure 6 As shown, in some embodiments, the driving component 1 is used to drive the lens assembly 2 to move relative to the imaging element 3 along at least one of a first direction and a second direction, wherein the first direction is parallel to the light-incident direction of the imaging element 3 and the second direction is perpendicular to the light-incident direction of the imaging element 3.

[0056] With the above arrangement, when the driving component 1 drives the lens assembly 2 to move in the first direction or the second direction, the relative position parameters between the lens assembly 2 and the imaging element 3 can be changed, so that the light passing through the lens assembly 2 can present different images on the imaging element 3.

[0057] In some possible implementations, the driving component 1 drives the lens assembly 2 to move relative to the imaging element 3 along a first direction, thereby changing the distance between the lens assembly 2 and the imaging element 3. Different wavelengths of light passing through the lens assembly 2 can have different focal points. When the distance between the lens assembly 2 and the imaging element 3 coincides with the focal point of one of the wavelengths of light, that wavelength of light will form a corresponding image on the imaging element 3, such as... Figure 3 and Figure 5 As shown.

[0058] In some possible implementations, the driving component 1 is used to drive the lens assembly 2 to move relative to the imaging element 3 along a second direction, thereby changing the projection position of the lens assembly 2 on the imaging element 3. The light rays passing through the lens assembly 2 can have different imaging ranges, thus the imaging element 3 can contain images with different imaging content, such as... Figure 7 , Figure 9 and Figure 11 As shown.

[0059] In some embodiments, the drive component 1 includes at least one of a stepper motor, a voice coil motor, a shape memory alloy drive unit, and a micro-electro-mechanical system (MEMS).

[0060] The aforementioned devices can all be used as driving components 1 to drive lens components 2 to move relative to imaging elements 3 in order to obtain different images.

[0061] Voice coil motors are linear or oscillating drive devices that operate based on the Ampere force principle, named for their structural resemblance to the voice coil of a loudspeaker. Shape memory alloy drive units utilize the "shape memory effect" of shape memory alloy materials to achieve actuation. Microelectromechanical systems (MEMS) are miniature systems that integrate microelectronics and mechanical engineering. They fabricate micron-scale mechanical structures (such as sensors and actuators) on chips using microfabrication processes. These systems utilize semiconductor photolithography, etching, and other microfabrication techniques to construct tiny mechanical components (such as cantilever beams, gears, and diaphragms) on materials like silicon. These components can be driven by electrical, optical, or thermal signals to achieve sensing, motion, or energy conversion functions.

[0062] The aforementioned devices all have the advantages of small size and high flexibility, which can meet the usage requirements of image acquisition devices.

[0063] Combination Figure 1 As shown, in some embodiments, the lens assembly 2 includes at least one metasurface lens 21, which is used to form a first image on the imaging element 3 with light of a first target wavelength when the lens assembly 2 is in a first position, and to form a second image on the imaging element 3 with light of a second target wavelength when the lens assembly 2 is in a second position.

[0064] For lens assembly 2, since the light in the environment contains light of various wavelengths, and these electromagnetic waves undergo different refractions when passing through a medium that produces optical path difference (such as metasurface lens 21), similar to the beam splitting phenomenon of a prism. Because the exit angles of various light rays differ, their focal positions also differ. Therefore, when the imaging element 3 is in different positions, i.e., at different image distances, the obtained image information will differ. Thus, by combining different focal length positions and metasurface lens 21, different spectral images can be decomposed to obtain more analyzable biological features, i.e., different first and second images can be obtained.

[0065] Metasurfaces are a novel type of optical material that can precisely control light by altering its propagation direction and phase through minute structural changes. The principle behind metasurfaces is phase modulation based on nanostructures and subwavelength microstructures; by controlling the phase and amplitude of light, precise control can be achieved. This material can be manufactured using high-precision nanofabrication techniques, such as electron beam lithography and ion beam etching.

[0066] In some embodiments, at least one metasurface lens 21 has a nanostructure 211 on its surface or inside.

[0067] The metasurface lens 21 utilizes the differences in the medium material and nanostructure imparted by its fabrication to interfere with the propagation state of electromagnetic waves of light. These metastructures generate a large number of diffraction effects, and due to these diffraction effects, the optics of multiple regions will superimpose, resulting in a significant difference between the image information obtained in the imaging element 3 and the imaging state of a traditional optical lens. It is no longer an image of biometric information that can be directly distinguished. Only by using a metasurface lens 21 with a completely identical structure can the pixel features of each region be reconstructed and restored. Since these features are nanoscale optical features and are numerous, restoring and deciphering these product features becomes extremely difficult.

[0068] For example, the arrangement of the nanostructures 211 can be periodic or random, depending on the desired optical performance.

[0069] Because the metasurface lens 21 has a relatively serious dispersion problem, related technologies usually focus on eliminating this dispersion problem. However, the embodiments of this application aim to utilize the dispersion effect of the metasurface lens 21 and use the dispersion effect to achieve spectral focusing tuning and optical zoom in the visible light spectrum, so as to perform tomographic acquisition of biological features at different wavelengths, obtain richer biological feature information, and complete multispectral image acquisition can be completed using a single imaging unit.

[0070] Combination Figure 12As shown, in some embodiments, the nanostructure 211 includes a substrate 211a and nanomonomers 211b, with the nanomonomers 211b arranged in an array on the surface or inside the substrate 211a.

[0071] The shape of the nanomonomer 211b can be one or more of the following: prismatic, cylindrical, or conical.

[0072] The substrate 211a is a silicon oxide substrate, and the nanomonomer 211b is one or more of the following: titanium oxide microstructure, gallium nitride microstructure, and silicon carbide microstructure.

[0073] By employing the aforementioned nanostructure 211, the metasurface lens 21 can achieve different diffraction effects, forming different image information at different image distances, thereby enabling the imaging element 3 to obtain a first image and a second image with different biological feature information.

[0074] Combination Figure 13 As shown, in some embodiments, the image acquisition device further includes a control unit 4, which is connected to the drive component 1.

[0075] The control unit 4 is used to output a first control signal or a second control signal to the drive assembly 1. When the drive assembly 1 responds to the first control signal, it drives the lens assembly 2 to move to a first position, and when it responds to the second control signal, it drives the lens assembly 2 to move to a second position.

[0076] With the above arrangement, the control unit 4 can control the movement of the drive component 1, so that the drive component 1 can drive the lens component 2 to the precise first position and the second position, thereby realizing precise movement control of the lens component 2. As a result, the position information of the first image, the second image and the lens component 2 correspond more accurately, which can avoid the problem that the first image and the second image cannot be recognized and verified due to the position information error of the lens component 2.

[0077] Combination Figure 13 As shown, in some embodiments, the identification device further includes a key mapping unit 5, which is electrically connected to the control unit 4 and the imaging element 3 respectively. The key mapping unit 5 is used to store a first mapping relationship between a first image and a first control signal, and to store a second mapping relationship between a second image and a second control signal.

[0078] With the above arrangement, the identification device can use the key mapping unit 5 to store the mapping relationship between the image and the control signal, and achieve dual-layer authentication of the image and position parameters when performing image acquisition and identification authentication, thus making the identification device more secure.

[0079] Combination Figure 14As shown, in some embodiments, the identification device further includes a supplementary lighting component 6, which is used to provide supplementary lighting toward the object to be identified.

[0080] With the above arrangement, the supplementary lighting component 6 can provide supplementary lighting for the object to be identified in the event of insufficient light, ensuring the clarity of the captured image.

[0081] In some possible implementations, the supplementary lighting component 6 is arranged around the lens assembly 2 to provide uniform supplementary lighting to the object to be identified. Exemplarily, the supplementary lighting component 6 includes at least one LED light-emitting element.

[0082] For example, the supplementary lighting component 6 is electrically connected to the control unit 4, which is used to control the on / off state and brightness adjustment of the supplementary lighting component 6.

[0083] On the other hand, reference Figure 14 As shown, this embodiment provides an identification device, which includes the image acquisition device of this application. It has all the beneficial technical effects of this application, and realizes optical encryption of the image by using the relative position information of the lens assembly and the imaging element. The biometric information in the image is encrypted and hidden, and the identification device has higher security.

[0084] Combination Figure 14 As shown, in some embodiments, the identification device further includes a housing 7, with the drive assembly 1, lens assembly 2 and imaging element 3 located inside the housing 7.

[0085] With the above arrangement, the identification device can use the housing 7 to support and protect the drive assembly 1, lens assembly 2 and imaging element 3, preventing the drive assembly 1, lens assembly 2 and imaging element 3 from being contaminated by external dust and water stains, and maintaining high operational reliability.

[0086] It should be noted that in the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0087] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0089] The above description is merely an embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An image capturing device, characterized by, The image acquisition device includes: a driving component (1), a lens component (2), and an imaging element (3); The lens assembly (2) is located on the light-inlet side of the imaging element (3); The lens assembly (2) is connected to the drive assembly (1), and the drive assembly (1) is used to drive the lens assembly (2) to move relative to the imaging element (3); The lens assembly (2) has at least a first position and a second position; In the first position, light passes through the lens assembly (2) and forms a first image on the imaging element (3); in the second position, the light passes through the lens assembly (2) and forms a second image on the imaging element (3).

2. The image acquisition device of claim 1, wherein, The driving assembly (1) is used to drive the lens assembly (2) to move relative to the imaging element (3) along at least one of a first direction and a second direction, wherein the first direction is parallel to the light-gathering direction of the imaging element (3) and the second direction is perpendicular to the light-gathering direction of the imaging element (3).

3. The image acquisition device of claim 2, wherein, The drive assembly (1) includes at least one of a stepper motor, a voice coil motor, a memory alloy drive unit, and a microelectromechanical system.

4. The image acquisition device of claim 1, wherein, The lens assembly (2) includes at least one metasurface lens (21), which is used to form a first image on the imaging element (3) with light of a first target wavelength when the lens assembly (2) is in the first position, and to form a second image on the imaging element (3) with light of a second target wavelength when the lens assembly (2) is in the second position.

5. The image acquisition device of claim 4, wherein, The surface or interior of the at least one metasurface lens (21) is provided with nanostructures (211).

6. The image acquisition device of claim 5, wherein, The nanostructure (211) includes a substrate (211a) and nanomonomers (211b), wherein the nanomonomers (211b) are arranged in an array on the surface or inside the substrate (211a); The nanomonomer (211b) has one or more of the following shapes: prism, cylinder, and cone; The substrate (211a) is a silicon oxide substrate, and the nanomonomer (211b) is one or more of the following: titanium oxide microstructure, gallium nitride microstructure, and silicon carbide microstructure.

7. The image acquisition device according to any one of claims 1 to 6, characterized in that, The image acquisition device also includes a control unit (4), which is connected to the drive component (1); The control unit (4) is used to output a first control signal or a second control signal to the drive assembly (1). When the drive assembly (1) responds to the first control signal, it drives the lens assembly (2) to move to the first position, and when the second control signal responds to the second control signal, it drives the lens assembly (2) to move to the second position.

8. The image acquisition device of claim 7, wherein, The image acquisition device further includes a key mapping unit (5), which is electrically connected to the control unit (4) and the imaging element (3) respectively. The key mapping unit (5) is used to store a first mapping relationship between the first image and the first control signal, and to store a second mapping relationship between the second image and the second control signal.

9. The image acquisition device according to any one of claims 1 to 6, characterized in that, The image acquisition device also includes a supplementary lighting component (6), which is used to provide supplementary lighting toward the object to be identified.

10. An identification device, characterized by The identification device includes the image acquisition device according to any one of claims 1 to 9.

11. The identification device of claim 10, wherein, The identification device also includes a housing (7), and the driving component (1), the lens component (2) and the imaging element (3) are located inside the housing (7).

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