Gait recognition identity authentication method based on stress luminescence film

Abstract

The present application uniformly incorporates stress luminescent material into flexible padding to prepare a large-area stress luminescent film, combines the film with a transparent support system and an image acquisition system to form a gait recognition signal acquisition system capable of real-time extraction of footprint data, and the person walking above the gait recognition signal acquisition system applies pressure to the stress luminescent film to generate a stress radiation light field, and the image acquisition system extracts the light field to obtain information such as the footprint, stride and pace of the walking person, and finally completes gait recognition identity authentication according to the information. The present application incorporates footprint identification into the gait recognition category, realizes real-time and continuous acquisition of footprint information through the stress luminescent film and the image acquisition system, and provides a new technical means for improving the accuracy of a biometric authentication system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the cross discipline of photoelectric detection, optical sensing and pattern recognition, and particularly relates to a method for realizing identity authentication based on gait recognition by uniformly incorporating stress luminescent material into flexible padding to prepare a large-area stress luminescent film, and identifying gait information of a person walking above by carpeting. BACKGROUND

[0002] Gait recognition is a new type of biometric authentication technology, which mainly identifies the identity of a person through the way he walks. The gait recognition technology widely used at present belongs to the field of intelligent video monitoring, and has the advantages of long-distance and non-contact. Meanwhile, since the walking posture of a person is difficult to deliberately hide, gait recognition often has higher identity authentication accuracy than image recognition. On the other hand, footprint identification is a test method commonly used in criminal case investigation, which mainly analyzes the image traces of the sole, shoes, socks, etc., analyzes the walking rule of a person through the pace characteristics of the footprint, and also can infer the information such as height, weight, age, etc. Gait recognition and footprint identification both judge the identity information through the walking posture of a person, but have different focuses. The image collection direction of gait recognition is horizontal, and the image collection direction of footprint identification is vertical; gait recognition collects instantaneous dynamic data, and footprint identification collects left trace static data. Therefore, if there is a means for collecting footprint in real time and analyzing, it will make the gait recognition information rise from two-dimensional to three-dimensional, greatly improving the accuracy of identity authentication based on gait recognition and the information processing speed.

[0003] The continuous distribution stress sensor is needed for real-time dynamic collection of footprint. The quasi-continuous distribution stress sensor based on piezoelectric sensing probe array or optical fiber sensing probe array will produce mosaic effect in collecting footprint information, and the number of probes required for reliable gait recognition is large, the number of parallel signals is large, and the collection speed will be seriously affected. SUMMARY

[0004] In view of the above defects, the technical problem to be solved by the present application is how to uniformly incorporate stress luminescent material into flexible padding to prepare a stress luminescent film, and the light emission effect is generated at any place of the film under the action of stress, and the light field intensity is positively correlated with the stress size; the stress luminescent film is made into a carpet shape and laid on a transparent medium, an image collection system is arranged below the transparent medium, a person walking above treads on the stress luminescent film, stress light field is generated and visual footprint is formed, the footprint information is extracted through the image collection system and gait comparison is carried out, and then the identity authentication of the walking person is completed.

[0005] In view of the above defects, the purpose of the present application is to provide a gait recognition identity authentication method based on stress luminescent film, stress luminescent material is evenly incorporated into flexible padding to prepare stress luminescent film, any part of the film can produce luminescence effect under stress, and the light field intensity distribution reflects the stress size distribution, the stress luminescent film is laid on the transparent medium, an image acquisition system is arranged below the transparent medium to collect the visual footprint of the stress luminescent film under the walking person's stepping condition, the walking data of the walking person is analyzed according to the visual footprint information, and the identity information of the walking person is recognized through feature matching.

[0006] Preferably, the visual footprint information includes but is not limited to visual footprint area, brightness distribution, generation time and span distance.

[0007] Preferably, the walking data includes but is not limited to the height and weight of the walking person, the pace and speed, and the walking habit.

[0008] The present application provides a gait recognition identity authentication method based on stress luminescent film, which specifically comprises the following steps:

[0009] S1, stress luminescent material is evenly incorporated into flexible padding to prepare stress luminescent film, the acting surface size of the stress luminescent film is more than ten times the thickness, the stress luminescent material is evenly distributed in the film, any part of the film can produce luminescence effect under stress, and the light field intensity is positively correlated with the stress size;

[0010] S2, the stress luminescent film is made into a carpet shape and laid above the transparent medium, a security image acquisition system is arranged below the transparent medium, when the stress luminescent film response wavelength is in the visible light band, a visible light camera is used for signal extraction, and when the stress luminescent film response wavelength is in the non-visible light band, an infrared camera is used for signal extraction;

[0011] S3, the target object walks above the stress luminescent film, the stress caused by stepping will produce luminescent footprints, and when the thickness of the stress luminescent film is very small, the luminescent film will be extracted by the image acquisition system through the transparent medium below;

[0012] S4, the gait characteristics of the target object are formed by analyzing the collected footprint information, and the identity authentication is completed through pattern recognition matching.

[0013] Preferably, the footprint information in S4 includes but is not limited to footprint size, pace and speed, force habit and estimated weight.

[0014] Preferably, the stress luminescent film is made into a carpet shape and laid above the glass frame, the length of the glass frame and the stress luminescent film is more than 5m, so that the person walking above can at least step out 6 footprints.

[0015] Preferably, one or more cameras are arranged below the glass frame to achieve high-definition imaging of the entire lower surface of the stress luminescent film without aberration.

[0016] Preferably, the size of the footprint reflects the shoe size of the target object, the pattern of the footprint reflects the shoe type of the target object, the depth information of the footprint reflects the weight of the target object, the intensity distribution of the luminescent footprint reflects the walking habit of the target object, the stride between two adjacent footprints reflects the pace of the target object, and the time between two adjacent footprints reflects the step speed of the target object.

[0017] The present application provides a gait recognition and identity authentication system based on a stress luminescent film, which comprises a stress luminescent film, a transparent medium, a plurality of cameras, an image acquisition system, and a gait recognition system.

[0018] The present application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the above method.

[0019] Compared with the prior art, the present application achieves the following technical effects:

[0020] Firstly, the present application provides a visual footprint identification method, i.e., a dynamic, visual, and spatially continuous footprint extraction is achieved by using a flexible stress luminescent film, which provides a new technical means for footprint identification.

[0021] Secondly, the gait recognition and identity authentication system based on the stress luminescent film is independent of and complementary to the existing gait recognition and identity authentication system, which provides a new data dimension for signal acquisition of the gait recognition system and greatly improves the biological authentication capability.

[0022] In addition, the stress luminescent film can not only be applied in the field of gait recognition and identity authentication, but also has certain application prospect in the medical field, especially in the field of sports injury. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows, and other drawings can be obtained by those of ordinary skill in the art without any creative effort on the premise that there is no creative effort.

[0024] Figure 1 An embodiment of the gait recognition identity authentication method based on the stress luminescence film is shown in the schematic diagram.

[0025] Figure 2 An embodiment of the gait recognition identity authentication system based on the stress luminescence film is shown in the schematic diagram.

[0026] Figure 3 Another embodiment of the gait recognition identity authentication method based on the stress luminescence film is shown in the schematic diagram. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application, and are not configured to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0028] It should be noted that in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0029] As Figure 1 shown, the present application provides an embodiment of the gait recognition identity authentication system based on the stress luminescence film, comprising:

[0030] S101, preparation of stress luminescent material, the stress luminescent material is uniformly incorporated into the flexible pad to prepare a stress luminescent film, any part of the film can produce a luminescence effect under stress, and the light field intensity distribution can reflect the stress size distribution;

[0031] S102, collection of footprint information, the stress luminescent film is made into a carpet shape and laid on a transparent medium such as glass, and an image acquisition system is arranged below the glass to collect the visualized footprint of the stress luminescent film under the walking and stepping conditions of the person;

[0032] S103, gait recognition and identity authentication, according to the information such as the area, brightness distribution, generation time and span distance of the visualized footprint, the information such as the height, weight, pace and speed of the walking person and the walking habit is analyzed, and the identity information of the walking person is recognized through feature matching.

[0033] As shown in Figure 2 , the embodiment shows an embodiment of a pressure light enhanced stress sensor based on stress luminescence, and the specific working mode is as follows:

[0034] (1) The stress luminescent material is uniformly incorporated into the flexible pad to prepare a flexible stress luminescent film, and the material and structure of the flexible pad need to be optimized to make the smaller external force produce the largest possible internal deformation, and the chemical composition and firing process of the stress luminescent material need to be optimized to make the smaller internal deformation produce the largest possible light radiation signal corresponding to the sensitivity peak wavelength of the photoelectric detector, which has a linear relationship between intensity and deformation.

[0035] (2) The stress luminescent film is made into a carpet shape and laid on the glass frame, and the length of the glass frame and the stress luminescent film should be more than 5m, so that the person walking above it can at least step on 6 footprints; One or more cameras are arranged below the glass frame, which can realize nearly distortionless high-definition imaging of the lower surface of the entire stress luminescent film.

[0036] (3) The target object walks on the stress luminescent film, and the pressure generated by stepping causes the stress luminescence effect, forming a visualized footprint on the stress luminescent film, and the footprint information is collected by the camera and input into the gait recognition system.

[0037] (4) The gait recognition system forms the gait information of the target object according to the footprints. Specifically, the size of the footprint reflects the shoe size of the target object, the pattern of the footprint reflects the shoe type of the target object, the depth information of the footprint reflects the weight of the target object (the higher the luminous footprint brightness, the greater the pressure, and the relatively greater the weight of the target object), the strength distribution of the luminous footprint reflects the walking habit (inward or outward eight) of the target object, the stride of the adjacent two footprints reflects the pace of the target object, and the time of the adjacent two footprints reflects the walking speed of the target object, etc. By analyzing and comparing the above information, the identity of the target object can be authenticated and recognized.

[0038] As shown in Figure 3 The embodiment also provides a gait recognition identity authentication method based on a stress luminescent film, which comprises the following steps:

[0039] S201, uniformly incorporating stress luminescent materials into a flexible pad to prepare a stress luminescent film, the stress luminescent film has a size far greater than the thickness, the stress luminescent materials are uniformly distributed in the film, and any part of the film can produce a luminescent effect under stress, and the light field intensity is positively correlated with the stress size;

[0040] S202, preparing the stress luminescent film into a carpet shape and laying it above a transparent medium, an security image acquisition system is arranged below the transparent medium, when the response wavelength of the stress luminescent film is in the visible light band, a visible light camera can be used for signal extraction; when the response wavelength of the stress luminescent film is in the non-visible light band, an infrared camera can be used for signal extraction;

[0041] S203, a target object walks above the stress luminescent film, and the stress caused by the treading will produce a luminescent footprint, when the thickness of the stress luminescent film is very small, the luminescent film will be extracted by the image acquisition system through the transparent medium below;

[0042] S204, forming the gait characteristics of the target object by analyzing the collected footprint information such as the footprint size, the stride and speed, the force habit, and the estimated weight, and completing the identity authentication through pattern recognition matching.

[0043] The embodiment also provides a gait recognition identity authentication method based on a stress luminescent film, which uniformly incorporates stress luminescent materials into a flexible pad to prepare a large-area stress luminescent film, combines the film with a transparent support system and an image acquisition system to form a gait recognition signal acquisition system capable of extracting footprint data in real time, and the stress luminescent film can produce stress radiation light field by the pressure applied by a person walking above the gait recognition signal acquisition system, the image acquisition system extracts the light field to obtain the footprint, the stride, the speed and other information of the walking person, and finally completes the gait recognition identity authentication according to the information.

[0044] In some embodiments, the stress luminescent material is a composite material, including but not limited to ZnS, ZnS:Cu 2+ , ZnS:Mn 2 + , ZnS:Al 3+ / Cu 2+ , ZnS:Mn 2+ / Cu 2+ , ZnS:Al 3+ / Mn 2+ / Cu 2+ , SrAl2O4Ca, CaZnOS:Sr, CaZnOS:Mn, CaZnOS:Pr, CaZnOS:Ho, CaZnOS:Er, CaZnOS:Dy, CaZnOS:Sm, CaZnOS:Eu, CaZnOS:Tm, CaZnOS:Nd, CaZnOS:Yb, can complete the conversion of kinetic energy to light energy, and will radiate light signals under stress, the intensity of the light signal is positively correlated with the size of the stress; the radiated light signal can be in the visible light band, or in the ultraviolet, near-infrared, mid-infrared, far-infrared and other invisible light bands.

[0045] In some embodiments, the image acquisition system can realize near- aberration-free capture of the luminescent footprints displayed on the stress luminescent film, the waveband of the collected image is consistent with the luminescent waveband of the stress luminescent material, the image acquisition system can include one or more cameras, a common camera can be used when the stress luminescent material works in the visible light band, an infrared camera can be used when the stress luminescent material works in the infrared band, the structure and layout of the camera are not limited, and the signal flow format and time synchronization method of the image acquisition system are not limited.

[0046] In some embodiments, the stress luminescent material is uniformly incorporated into a flexible pad and prepared into a flexible stress luminescent film, the size of the active surface of the film is much larger than the thickness.

[0047] In some embodiments, the stress luminescent material is uniformly distributed in the film, and the material type, ratio, concentration, and film mechanical structure and other parameters need to be optimized to maximize the stress luminescent response of each point.

[0048] In some embodiments, the stress luminescent film is attached to an arrayed photodetector, and the light intensity distribution generated by the stress distribution is restored to the stress distribution through multi-channel data analysis.

[0049] In some embodiments, the target object walks on the stress luminescent film and continuously steps on multiple luminescent footprints.

[0050] In some embodiments, the footprint information reflects the gait habit of the target object, including but not limited to: the size of the footprint reflects the shoe size of the target object, the pattern of the footprint reflects the shoe type of the target object, the depth information of the footprint reflects the weight of the target object (the higher the luminous footprint brightness, the greater the pressure, and the relatively greater the weight of the target object), the strength distribution of the luminous footprint reflects the walking habit of the target object (in-toeing or out-toeing), the stride of the adjacent two footprints reflects the pace of the target object, and the time of the adjacent two footprints reflects the walking speed of the target object.

[0051] In some embodiments, the algorithm used for gait recognition is not limited.

[0052] In some embodiments, the variable used for gait recognition is not limited.

[0053] In some embodiments, the application of gait recognition includes but is not limited to identity authentication, sports injury exploration, sports training enhancement, and other applications using stress luminescent materials to extract footprint information for gait recognition.

[0054] Compared with the prior art, the present application has the following advantages:

[0055] Firstly, the present application proposes a brand-new stress sensing method, i.e. through stress luminescent microbeads to amplify and convert the displacement signal of stress change into optical signals that can be quantitatively analyzed and reconstructed, providing a brand-new technical means for stress sensing systems;

[0056] Secondly, the stress luminescent microbeads described in the present application have the dual functions of stress amplification and light field convergence, which can greatly improve the sensitivity of photodetectors;

[0057] In addition, the pressure light enhanced stress sensor based on stress luminescence described in the present application is a passive sensor, which can realize long-time stress monitoring without external power supply, and the stress signal itself provides a power-on starting mechanism. Such characteristics have important value in long-time perimeter security and other application fields.

[0058] For the convenience of description, the above device is described as various units divided by functions. Of course, the functions of each unit can be implemented in the same or multiple software and / or hardware when implementing the present application.

[0059] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0060] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing unit or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams.

[0061] The application can be described in the general context of computer- executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules can be located in local and remote computer storage media including memory storage devices.

[0062] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams.

[0064] In one typical arrangement, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0065] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, non-volatile memory, such as read-only memory (ROM), EPROM, and / or flash memory, etc. The memory is an example of computer readable media.

[0066] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0067] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that includes the recited element.

[0068] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0069] The above merely provides an example of the present application, but is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the scope of claims of the present application.

Claims

1. A gait recognition and authentication method based on a stress-luminescent thin film, comprising: uniformly incorporating stress-luminescent material into a flexible pad to prepare a stress-luminescent thin film; any part of the film can produce a luminescent effect under stress, and the light field intensity distribution reflects the stress magnitude distribution; laying the stress-luminescent thin film on a transparent medium; and installing an image acquisition system under the transparent medium to collect the visual footprints generated by the stress-luminescent thin film under the footsteps of a walker; analyzing the walker's walking data based on the visual footprint information; and identifying the walker's identity information through feature matching; specifically including the following steps: S1. Stress-emitting materials are uniformly incorporated into flexible pads to prepare stress-emitting films. The size of the active surface of the stress-emitting film is more than ten times its thickness. The stress-emitting materials are uniformly distributed within the film. Any part of the film can produce a light-emitting effect under stress. The light field intensity is positively correlated with the stress magnitude. S2. The stress-emitting thin film is made into a carpet shape and laid on top of the transparent medium. An image acquisition system is placed below the transparent medium. When the response wavelength of the stress-emitting thin film is in the visible light band, a visible light camera is used for signal extraction. When the response wavelength of the stress-emitting thin film is in the non-visible light band, an infrared camera is used for signal extraction. S3. When the target object walks on the stress-luminescent film, the stress caused by stepping on it will produce luminescent footprints. When the thickness of the stress-luminescent film is extremely small, the luminescent film will be extracted by the image acquisition system through the transparent medium below. S4. By analyzing the collected footprint information, the gait characteristics of the target object are formed, and identity authentication is completed through pattern recognition and matching.

2. The gait recognition and authentication method based on stress-luminescent thin film according to claim 1, characterized in that, The visualized footprint information includes the visualized footprint area, brightness distribution, generation time, and span distance.

3. The gait recognition and authentication method based on stress-luminescent thin film according to claim 1, characterized in that, The walking data includes the walker's height, weight, stride length, walking speed, and walking habits.

4. The gait recognition and authentication method based on stress-luminescent thin film according to claim 1, characterized in that, The footprint information in S4 includes footprint size, stride length and speed, force exertion habits, and estimated weight.

5. The gait recognition and authentication method based on stress-luminescent thin film according to claim 3, characterized in that, The stress-emitting film is made into a carpet shape and laid on top of a glass frame. The glass frame and the stress-emitting film are more than 5m long, so that people walking on it can leave at least 6 footprints.

6. The gait recognition and authentication method based on stress-luminescent thin film according to claim 1, characterized in that, The size of the footprints reflects the shoe size of the target object, the pattern of the footprints reflects the shoe type of the target object, the footprint depth information reflects the weight of the target object, the intensity distribution of the luminous footprints reflects the walking habits of the target object, the span between two adjacent footprints reflects the stride length of the target object, and the time of generation of two adjacent footprints reflects the walking speed of the target object.

7. A system for implementing the gait recognition authentication method based on a stress-luminescent thin film as described in any one of claims 1-6, comprising a stress-luminescent thin film, a transparent medium, multiple cameras, an image acquisition system, and a gait recognition system. A flexible stress-luminescent thin film is prepared by uniformly incorporating stress-luminescent material into a flexible padding material. The stress-luminescent thin film is made into a carpet-like shape and laid on top of the transparent medium. One or more cameras are positioned below the transparent medium to achieve aberration-free high-definition imaging of the entire lower surface of the stress-luminescent thin film. When a target object walks on the stress-luminescent thin film, the pressure generated by stepping causes a stress-luminescent effect, forming a visible footprint on the stress-luminescent thin film. This footprint information is collected by the cameras and input into the gait recognition system. The gait recognition system analyzes and compares the gait information of the target object based on the footprint to authenticate and identify the target object's identity.

8. A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the method of any one of claims 1-6.

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