A desensitization data collection method and desensitization camera for public venues

Abstract

The application belongs to the field of cameras, and particularly relates to a desensitization data acquisition method for public venues and a desensitization camera. Through a recognition module of the desensitization camera body, complete localization of visual analysis of the desensitization camera is realized, and the need for in-depth analysis of a specified application scene and a recognition target can be met. The desensitization camera body only provides desensitized information such as an occupancy rate and a number of people in a queue to a background, and original images related to sensitivity do not need to be stored locally, transmitted via a network or processed in the background, so that the problem related to sensitivity is eliminated on the side of an image recognition terminal. The desensitization camera collects image information related to sensitivity, which is only processed in a random storage device of the equipment in real time, discarded in real time after recognition analysis is completed, and burned after reading. Through customization of hardware, functions and algorithms, the desensitization camera has high cost performance. The desensitization camera adopts a reliable edge computing 'package' mode, and the safety of system operation can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cameras, in particular to a desensitization data acquisition method and desensitization camera for public venues. BACKGROUND

[0002] The intelligent recognition of various specified image targets in public venues, such as the recognition of various image targets in a large field of view, complex environment, and changing scene, itself puts high requirements on the computing performance of the system, and the inclusion of small targets further challenges current mainstream algorithms.

[0003] In order to meet the above requirements as much as possible, the current mainstream solution for large field of view image target recognition is to use a "front-end-middle-end-back-end" system configuration, which transfers the large amount of calculation to the background processing, and the front-end camera is only used for collecting image information. However, in the process of local storage, network transmission, and background processing of private images, there are various security risks at various levels. Therefore, a desensitization data acquisition method and desensitization camera with high cost performance for public venues are proposed to solve the above problems.

[0004] In the desensitization intelligent camera system, through the customization of hardware, function, and algorithm, the target recognition and intelligent analysis are completely completed inside the intelligent camera, and only the calculated and desensitized information is output externally, which can achieve high privacy security with high cost performance. SUMMARY

[0005] In order to make up for the shortcomings of the prior art and solve the security risks in the process of local storage, network transmission, and background processing of private images in the "front-end-middle-end-back-end" mode used by the current mainstream market solution, a desensitization data acquisition method and desensitization camera for public venues are proposed.

[0006] The technical solution adopted by the present application to solve the technical problems is: a desensitization data acquisition method for public venues, which comprises the following steps:

[0007] S1: The recognition module of the desensitization camera body is used to realize the complete localization of the visual analysis of the desensitization camera, which can meet the needs of in-depth analysis of the specified application scene and the recognition target;

[0008] S2: The desensitization camera body is used to collect and intelligently analyze various targets including small targets in the recognition area, generate user target data such as desensitized seat occupancy rate and queue length, and only provide such desensitized information to the background, without any local storage, network transmission, and backend processing of the original image information related to privacy, thereby eliminating the problem of personal privacy on the image recognition terminal side;

[0009] S3: The desensitization camera body collects sensitive image information, which is only processed in the internal random storage of the device, discarded immediately after identification analysis, and achieves burn after reading; when working, burn after reading is realized, which refers to: (1) After the camera obtains an image, it is saved in the fixed area of the dynamic random memory SDRAM of the machine, which is called "image storage area". (2) A random number between 60 and 300 is generated, called "coverage amount", denoted by F. (3) The "image storage area" is divided into upper and lower halves. When the camera obtains an image, the image will be saved at a random starting point (denoted by Q) in the upper and lower halves of the "image storage area", and only F times of coverage writing will be performed at this position. After F times of coverage, the previous image area is filled with random numbers, the Q value is updated, and the new image will be saved at the starting point of the new Q value, and the cycle is repeated. (4) The upper half starts to save in the positive direction, and the lower half starts to save in the reverse direction. The effect obtained in this way is: (1) When the next frame of image is obtained, the new image will cover the saved position of the last image, which can ensure that the used image is discarded immediately. (2) Avoid repeatedly reading and writing to a certain SDRAM position to affect its service life.

[0010] S4: Through the customization of hardware, functions and algorithms suitable for identification requirements, the desensitization camera described in the application can achieve high cost performance;

[0011] S5: The "package" mode of trusted edge computing used by the desensitization camera prevents the system program from being attacked when stored in the storage body, loaded and run.

[0012] Initial preparation: when the library is closed, call the high-definition camera to collect high-definition images, call the NPU of the micro edge computing device to detect and identify the empty seats, automatically divide each seat area, and include the corresponding desktop of the seat, etc. It can also be manually adjusted to generate a plurality of divided detection areas, assuming that N seat areas are generated.

[0013] Cycle recognition: when the venue is open, call the high-definition camera to collect high-definition images, call the low-price NPU of the built-in micro edge computing device, such as K210: total computing power 1TOPS, power 0.3W, to N divided visual detection areas, such as the above seat area, for fast recognition in turn. K210 maximum detection image area is 224*224 pixels, each time only a single seat area is detected, then a single seat area can match 224*224=50,000 pixels, under the corresponding resolution of this small field of view, it can detect small targets that cannot be well detected under the panoramic picture under the limitation of the current mainstream target detection algorithm. Not only can it detect personnel, laptops, books, etc., but also can better identify mobile phones, cups, etc. Small targets such as mobile phones and cups are also the basis for determining whether someone is using the seat. Cycle detection of all seat areas will make the detection time per round*N. After actual measurement, NPU such as K210 with 1TOPS can control the single seat area detection time within 100ms. In this way, for general indoor application scenarios such as 200 seat areas, the total detection time per round is 20 seconds, and 20 seconds to generate seat occupancy information is completely acceptable. The desensitization camera with K210 and other low-cost, low-power NPU as the main computing chip has a high cost performance, and its volume and heat dissipation can also be well controlled, which is convenient for large-scale deployment.

[0014] Desensitization camera adopts the "package" mode of trusted edge computing:

[0015] The operating system code of the desensitization camera is fixed in its read-only memory, and the code itself is encrypted. The completely fixed system loader (including encryption and decryption and running verification functions) verifies the code when loading and running the code to prevent system programs from being attacked in the storage body, during loading and running. When the program is abnormal or there is an intrusion risk, the program will not run, and the system will automatically lock and issue a warning. When performing system-level high-risk operations such as online firmware update and system reset, the local desensitization camera scanning "management two-dimensional code" must be combined. The "management two-dimensional code" is randomly generated when the system is first run or reset, and can be saved by taking screenshots on the control end. After the camera scans and authenticates, system-level high-risk operations can be performed, which can eliminate the risk of local attacks and hacker remote attacks when performing such operations.

[0016] The main computing chip adopts K210 independently developed by Jiannan Technology. It is a system-level chip integrating machine vision, convolutional neural network accelerator processor and machine hearing multi-modal recognition. It has the ability of audio-visual integration, computing power of 1TOPS, chip power consumption <300mW, using TSMC's ultra-low power 28nm process, with RISC-V64bit dual-core processor, each processing core has independent FPU, and can be widely used in smart home, smart park, smart energy consumption and smart agriculture and other scenes.

[0017] The desensitization camera for public venues is suitable for the desensitization data acquisition method for public venues. The outer surface of the desensitization camera body is fixedly installed with a light shield. One side of the desensitization camera body is provided with a lens. The bottom end of the desensitization camera body is fixedly installed with two connecting rods. One end of the connecting rod is fixedly installed with a bottom plate. The inside of the bottom plate is fixedly installed with two electric push rods. One side of the electric push rod is fixedly installed with a signal receiver. One end of the electric push rod is fixedly installed with a fixed block. One side of the fixed block is provided with a fixed groove. The side wall of the fixed groove is fixedly installed with two elastic bands. The inside of the fixed groove is provided with a cleaning cloth. When working, the two elastic bands on one side of the fixed block are pulled to put the cleaning cloth into the fixed groove of the fixed frame. Then the elastic bands are loosened to clamp the cleaning cloth in the fixed groove of the fixed block. At this time, the GSM900MHZ signal transmitter transmits instructions to make the GSM900MHZ signal receiver on the electric push rod receive instructions and drive the electric push rod to work. The electric push rod slides with the fixed block and the cleaning cloth. At this time, the cleaning cloth is in close contact with the lens on the desensitization camera body. Through the back and forth sliding of the cleaning cloth, the cleaning cloth wipes the lens on the desensitization camera body clean. The wiping function can remove the dust on the lens of the desensitization camera body to avoid affecting the shooting of the desensitization camera body.

[0018] Preferably, the inner wall of the fixed groove is fixedly installed with a magic tape subface. One end of the cleaning cloth is fixedly installed with a magic tape mother face. When the cleaning cloth enters the fixed groove, the magic tape mother face on the cleaning cloth is aligned with the magic tape subface in the fixed groove, and the cleaning cloth is fixed in the fixed groove.

[0019] Preferably, one side of the fixed block is fixedly provided with a limiting box, an inner wall of the limiting box is fixedly provided with a water tank, one side of the water tank is fixedly provided with a water pipe, and one side of the limiting box is slidably connected with a sliding column; during operation, when the two fixed blocks move towards each other, the two sliding columns abut and are pressed, so as to push the sliding columns towards the water tank, so that one end of the sliding column presses the water tank, at this time, the water in the water tank flows into the fixed groove of the fixed block through the water pipe, so that the cleaning cloth in the fixed groove is wetted, the wetted cleaning cloth is more easily wiped, the cleaning cloth is made of quick-drying fabric, and when the cleaning cloth is wetted, it can be quickly dried, when the cleaning cloth is dried after wiping the lens, an electric push rod is started, and the dried cleaning cloth is used to wipe the lens, so that the water on the lens is wiped dry, when the electric push rod is started, the two sliding columns are not pressed, and therefore the water tank does not discharge water.

[0020] Preferably, one end of the sliding column is fixedly provided with a bumper pad, and the other end of the sliding column away from the bumper pad is fixedly provided with a top plate; during operation, when the two fixed blocks move towards each other, the bumper pads on the sliding columns abut first, so as to avoid direct impact of the two sliding columns, and since the bumper pad and the top plate are made of rubber, repeated impact will not cause damage, and the top plate will not cause damage to the water tank when pressing the water tank.

[0021] Preferably, the surface of the sliding column is sleeved with a spring, one end of the spring is fixedly provided with the bumper pad, and the other end of the spring is fixedly provided with the limiting box; during operation, when the sliding column and the bumper pad are no longer pressed, the spring on the limiting box restores the elastic force, the spring resets the sliding column and the top plate through the bumper pad, so that the top plate no longer presses the water tank to discharge water.

[0022] The present application has the advantages that:

[0023] 1. The present application uses customized desensitization camera body hardware, functions and algorithms, so as to realize complete localization of desensitization camera visual analysis, obtain high cost performance, intelligently analyze application scene images, desensitize data collection of image targets in a desensitization area, only collect target data after desensitization such as seat occupancy, burn after reading sensitive images, do not locally save and network transmit sensitive images, and do not upload a back-end server, so as to eliminate personal privacy problems on the image recognition terminal side.

[0024] 2. The application is by pulling the fixed block side of the two elastic bands, so that the cleaning cloth into the fixed block fixed groove, and then loosen the elastic band, let the elastic band will clean cloth clamped in the fixed groove of the fixed block, at this time through the GSM900MHZ signal transmitter, transmit instructions, let the electric push rod on the GSM900MHZ signal receiver receives instructions, and drive the electric push rod starts to work, the electric push rod with fixed block and cleaning cloth start to slide, the cleaning cloth at this time and desensitization camera body on the lens, through the back and forth sliding cleaning cloth, so that the cleaning cloth will desensitization camera body on the lens wipe clean, wipe the function can remove desensitization camera body on the lens dust, to avoid affecting the desensitization camera body of the camera. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0026] Figure 1 For the flowchart of the desensitization data acquisition method of a public venue in embodiment one;

[0027] Figure 2 For the structural diagram of the desensitization camera body in embodiment one;

[0028] Figure 3 For the structural diagram of the bottom plate in embodiment one;

[0029] Figure 4 For the structural diagram of the magic tape subface in embodiment one;

[0030] Figure 5 For the structural diagram of the magic tape mother surface in embodiment one;

[0031] Figure 6 For the structural diagram of the B of embodiment one; Figure 3

[0032] Figure 7 For the structural diagram of the limiting frame in embodiment one;

[0033] Figure 8 For the structural diagram of the heat dissipation hole in embodiment two.

[0034] ​As shown in the figure: 1, desensitization camera body; 2, lens; 301, connecting rod; 302, bottom plate; 303, signal receiver; 304, fixed block; 305, fixed groove; 306, cleaning cloth; 307, elastic band; 308, magic tape subface; 309, magic tape mother surface; 310, limiting frame; 311, water tank; 312, water pipe; 313, sliding column; 314, anti-collision pad; 315, top plate; 316, spring; 317, electric push rod; 4, heat dissipation hole; 5, light shield. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] Embodiment one

[0037] Please refer to Figures 1-7 As shown in the figure, a desensitization data collection method for public venues, the steps are as follows:

[0038] S1: Through the identification module of the desensitization camera body 1, realize the complete localization of the desensitization camera visual analysis, which can meet the needs of in-depth analysis of specified application scenarios and identification targets;

[0039] S2: Through the desensitization camera body 1, image collection and intelligent analysis are performed on various targets including micro targets in the identification area, user target data such as desensitized attendance rate and queuing number are generated by analysis, and only such desensitized information is provided to the background, without any local storage, network transmission and backend processing of the original image information involving privacy, so as to eliminate the problem of personal privacy on the image recognition terminal side;

[0040] S3: The sensitive image information collected by the desensitization camera body 1 is only processed in the internal random storage of the device, discarded immediately after identification analysis, and achieves the effect of burning after reading; during work, the implementation of burning after reading refers to: (1) After the camera obtains an image, the image is saved in the fixed area of the dynamic random memory SDRAM of the machine, which is called "image storage area". (2) The system generates a random number between 60-300, called "coverage amount", denoted by F. (3) The "image storage area" is divided into upper and lower halves. When the camera obtains an image, the image will be saved at a random starting point (denoted by Q) in the upper and lower halves of the "image storage area", and only F times of coverage writing will be performed at this position. After F times of coverage, the previous image area is filled with random numbers, the Q value is updated, and the new image will be saved at the starting point of the new Q value, and the cycle is repeated. (4) The upper half starts to save in the forward direction, and the lower half starts to save in the reverse direction. The effect obtained in this way is: (1) When the next frame of image is obtained, the new image will cover the saved position of the previous image, which can ensure that the used image is discarded immediately. (2) Avoiding repeated reading and writing to a certain SDRAM position to affect its service life.

[0041] S4: Through the customization of hardware, functions and algorithms suitable for identification requirements, the desensitization camera described in the application can achieve high cost performance;

[0042] S5: The "package" mode of trusted edge computing adopted by the desensitization camera prevents the system program from being attacked when stored in the storage body, loaded and run.

[0043] Initial preparation: when the library is closed, call the high-definition camera to collect high-definition images, call the NPU of the micro edge computing device to detect and identify the empty seats, automatically divide each seat area, and include the corresponding desktop and other seat areas, which can also be manually adjusted. In this way, a plurality of divided detection areas are generated, and it is assumed that N seat areas are generated.

[0044] Cycle recognition: when the venue is open, call the high-definition camera to collect high-definition images, call the low-price NPU of the built-in micro edge computing device, such as K210: total computing power 1TOPS, power 0.3W, to N divided visual detection areas, such as the above seat area, for fast recognition in turn. K210 maximum detection image area is 224*224 pixels, each time only a single seat area is detected, then a single seat area can match 224*224=50,000 pixels, under the corresponding resolution of this small field of view, it can detect small targets that cannot be well detected under the panoramic picture by the current mainstream target detection algorithm. Not only can it detect personnel, laptops, books, etc., but it can also better identify mobile phones, cups, etc. Small targets such as mobile phones and cups are also the basis for determining whether someone is using the seat. Cycle detection of all seat areas will make the detection time per round N. After actual measurement, NPU such as K210 with 1TOPS can control the single seat area detection time within 100ms. In this way, for general indoor application scenarios such as 200 seat areas, the total detection time per round is 20 seconds, and 20 seconds to generate seat occupancy information is completely acceptable. The desensitization camera with K210 and other low-cost, low-power NPU as the main computing chip has a high cost performance, and its size and heat dissipation can also be well controlled, which is convenient for large-scale deployment.

[0045] Desensitization camera adopts a "package" way of trusted edge computing:

[0046] The operating system code of the desensitization camera is fixed in its read-only memory, and the code itself is encrypted. The completely fixed system loader (including encryption and decryption and running verification functions) verifies the code when loading and running the code to prevent system programs from being attacked in the storage body, during loading and running. When the program is abnormal or there is an intrusion risk, the program will not run, and the system will automatically lock and issue a warning. When performing system-level high-risk operations such as online firmware update and system reset, the local desensitization camera scanning "management two-dimensional code" must be combined. The "management two-dimensional code" is randomly generated when the system is first run or reset, and can be saved by taking screenshots on the control end. After the camera scans and authenticates, system-level high-risk operations can be performed, which can eliminate the risk of local attacks by non-managers and remote attacks by hackers when performing such operations.

[0047] The application discloses a desensitization camera for public places, which is suitable for the desensitization data collection method for public places, and the desensitization camera body 1 is provided with a light shield 5 fixedly installed on the outer surface, a lens 2 on one side of the desensitization camera body 1, two connecting rods 301 fixedly installed at the bottom end of the desensitization camera body 1, a bottom plate 302 fixedly installed at one end of the connecting rod 301, two electric push rods 317 fixedly installed in the bottom plate 302, a signal receiver 303 fixedly installed on one side of the electric push rod 317, a fixed block 304 fixedly installed at one end of the electric push rod 317, a fixed groove 305 formed in one side of the fixed block 304, two elastic bands 307 fixedly installed on the side wall of the fixed groove 305, and a cleaning cloth 306 arranged in the fixed groove 305; during the operation, the two elastic bands 307 on one side of the fixed block 304 are pulled, so that the cleaning cloth 306 is arranged in the fixed groove 305 of the fixed block 304, then the elastic bands 307 are loosened, the elastic bands 307 clamp the cleaning cloth 306 in the fixed groove 305 of the fixed block 304, then the GSM900MHZ signal transmitter emits an instruction, the GSM900MHZ signal receiver 303 on the electric push rod 317 receives the instruction and drives the electric push rod 317 to start working, the electric push rod 317 slides with the fixed block 304 and the cleaning cloth 306, at this time, the cleaning cloth 306 is attached to the lens 2 on the desensitization camera body 1, the cleaning cloth 306 slides back and forth, so that the cleaning cloth 306 wipes the lens 2 on the desensitization camera body 1 clean, and the wiping function can remove dust on the lens 2 on the desensitization camera body 1, thereby avoiding affecting the shooting of the desensitization camera body 1.

[0048] The inner wall of the fixed groove 305 is fixedly installed with a Velcro subface 308, and the cleaning cloth 306 is fixedly installed with a Velcro female face 309 at one end; during the operation, when the cleaning cloth 306 enters the fixed groove 305, the Velcro female face 309 on the cleaning cloth 306 is aligned with the Velcro subface in the fixed groove 305, so that the cleaning cloth 306 is fixed in the fixed groove 305.

[0049] The fixed block 304 is fixedly installed with a limiting box 310 on one side, the inner wall of the limiting box 310 is fixedly installed with a water tank 311, one side of the water tank 311 is fixedly installed with a water pipe 312, and one side of the limiting box 310 is slidably connected with a sliding column 313; when the two fixed blocks 304 move towards each other, the two sliding columns 313 will be in contact and extruded, and then the sliding column 313 is pushed towards the water tank 311, so that one end of the sliding column 313 extrudes the water tank 311, at this time the water in the water tank 311 will flow into the fixed groove 305 of the fixed block 304 through the water pipe 312, so that the cleaning cloth 306 in the fixed groove 305 is wetted, the wet cleaning cloth 306 is more easily wiped off the lens 2, and the cleaning cloth 306 is made of quick-drying fabric and can be quickly dried after being wetted; when the lens 2 is wiped and the cleaning cloth 306 is dried, an electric push rod 317 is started to wipe the lens 2 with the dried cleaning cloth 306, so that the water on the lens 2 is wiped dry; when the electric push rod 317 is started, the two sliding columns 313 will not be extruded, so that the water tank 311 will not be extruded.

[0050] One end of the sliding column 313 is fixedly installed with a bumper pad 314, and the other end of the sliding column 313 away from the bumper pad 314 is fixedly installed with a top plate 315; when the two fixed blocks 304 move towards each other, the bumper pads 314 on the sliding columns 313 will first contact each other to avoid direct impact of the two sliding columns 313, and since the bumper pad 314 and the top plate 315 are both made of rubber material, repeated impact will not damage them, and the top plate 315 will not damage the water tank 311 when extruding the water tank 311.

[0051] The surface of the sliding column 313 is sleeved with a spring 316, one end of the spring 316 is fixedly installed with the bumper pad 314, and the other end of the spring 316 is fixedly installed with the limiting box 310; when the sliding column 313 and the bumper pad 314 are no longer extruded, the spring 316 on the limiting box 310 restores the elastic force, the spring 316 resets the sliding column 313 and the top plate 315 through the bumper pad 314, so that the top plate 315 no longer extrudes the water tank 311 to extrude water.

[0052] Example two

[0053] Please refer to Figure 8As shown, in the comparative example one, as another embodiment of the present application, the light shield 5 is provided with heat dissipation holes 4 on both sides; in work, when the desensitization camera body 1 works for a long time, heat will be generated inside the desensitization camera body 1, at this time, heat dissipation is needed in time, the heat in the desensitization camera body 1 is discharged through the heat dissipation holes 4 on the light shield 5, so as to reduce the temperature in the desensitization camera body 1, avoid the temperature in the desensitization camera body 1 being too high, and affect the normal use of the components in the desensitization camera body 1.

[0054] The working principle is that by pulling the two elastic bands 307 on one side of the fixed block 304, the cleaning cloth 306 is placed into the fixed groove 305 of the fixed frame, and then the elastic bands 307 are loosened, so that the elastic bands 307 clamp the cleaning cloth 306 in the fixed groove 305 of the fixed block 304. The magic tape female face 309 on the cleaning cloth 306 will align with the magic tape male face in the fixed groove 305, and then the cleaning cloth 306 is fixed in the fixed groove 305. At this time, through the GSM900MHZ signal transmitter, the GSM900MHZ signal receiver 303 on the electric push rod 317 receives the instruction and drives the electric push rod 317 to work. The electric push rod 317 slides with the fixed block 304 and the cleaning cloth 306. At this time, the cleaning cloth 306 is attached to the lens 2 on the desensitization camera body 1. When the two fixed blocks 304 move towards each other, the two sliding columns 313 will be connected and extruded. When the two fixed blocks 304 move towards each other, the anti-collision pads 314 on the sliding columns 313 will first contact each other to avoid direct impact of the two sliding columns 313. Since the anti-collision pads 314 and the top plate 315 are made of rubber material, repeated impact will not damage them, and the top plate 315 will not damage the water tank 311 when extruding the water tank 311. Thus, the sliding column 313 is pushed towards the water tank 311, so that one end of the sliding column 313 extrudes the water tank 311. At this time, the water in the water tank 311 will flow into the fixed groove 305 of the fixed block 304 through the water pipe 312, so that the cleaning cloth 306 in the fixed groove 305 is wetted. By sliding back and forth, the cleaning cloth 306 wipes the lens 2 on the desensitization camera body 1 clean. When the sliding column 313 and the anti-collision pad 314 are no longer extruded, the spring 316 on the limiting frame 310 restores the elastic force. The spring 316 resets the sliding column 313 and the top plate 315 through the anti-collision pad 314, so that the top plate 315 no longer extrudes the water tank 311. The cleaning cloth 306 is made of quick-drying fabric and can be quickly dried after being wet. After wiping the lens 2 and drying the cleaning cloth 306, start an electric push rod 317 to wipe the lens 2 with the dried cleaning cloth 306, so as to wipe off the water on the lens 2. When starting an electric push rod 317, the two sliding columns 313 will not extrude each other, so the water tank 311 will not extrude water. The wiping function can remove the dust on the lens 2 of the desensitization camera body 1 to avoid affecting the shooting of the desensitization camera body 1.

[0055] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A desensitization data collection method for public venues, characterized by: The steps are as follows: S1: Through the identification module of the desensitization camera body (1), the complete localization of the desensitization camera visual analysis is realized, which can meet the needs of in-depth analysis of specified application scenarios and identification targets; S2: Through the desensitization camera body (1), the image collection and intelligent analysis of various targets including micro targets in the identification area are performed, and user target data such as desensitized seat occupancy rate and queue length are generated, and only such desensitized information is provided to the background, without any local storage, network transmission and backend processing of the original image information related to privacy, thereby eliminating the problem of personal privacy on the image recognition terminal side; S3: The desensitization camera body (1) collects image information related to privacy only for immediate processing in the internal random storage of the device, and discards it immediately after completing the identification analysis, realizing burn after reading; Wherein, the burn after reading is realized by the following method: After the desensitization camera obtains the image, the image is saved in the fixed area of the dynamic random memory SDRAM of the local machine, which is called "image saving area"; A random number between 60 and 300 is generated, called "coverage amount", denoted by F; The "image saving area" is divided into upper and lower halves, when the desensitization camera obtains an image, the image will be saved at a random starting point in the upper and lower halves of the "image saving area", denoted by Q, and only F times of overwrite are written in this position, after F times of coverage, the previous image area is filled with random numbers, and the Q value is updated, the new image will be saved at the starting position of the new Q value, and the cycle is repeated; The upper half starts to save in the forward direction, and the lower half starts to save in the reverse direction; The effect obtained is: (1) when the next frame of image is obtained, the new image will cover the saved position of the last image, which can ensure that the used image is discarded immediately; (2) avoid repeatedly reading and writing to a certain SDRAM position to affect its service life; S4: Through the customization of hardware, functions and algorithms suitable for identification needs, the desensitization camera can achieve high cost performance; S5: The "package" mode of trusted edge computing used by the desensitization camera prevents system programs from being attacked during storage, loading and running; Wherein, through the customization of hardware, functions and algorithms suitable for identification needs, the desensitization camera can achieve high cost performance, including: Initial preparation: when the library is closed, the high-definition camera is called to collect high-definition images, and the NPU of the micro edge computing device is called to detect and identify the empty seats, so as to automatically divide each seat area and include the corresponding table top, and manually adjust to generate a plurality of divided detection areas; Cyclic identification: when the library is opened, the high-definition camera is called to collect high-definition images, and the low-cost NPU of the built-in micro edge computing device is called to perform fast identification on the divided detection areas in turn, detect micro targets, and cyclically detect all seat areas; Wherein, the "package" mode of trusted edge computing used by the desensitization camera prevents system programs from being attacked during storage, loading and running, including: The operating system code of the desensitization camera is fixed in the read-only memory, and the code itself is encrypted, and the system loader is completely fixed during loading and running of the code to prevent the system program from being attacked in the storage body, during loading and running; When the program is abnormal or the risk of intrusion is found, the program cannot run, and the system is automatically locked and a warning is issued; When a system-level high-risk operation is required, a local desensitization camera scans a "management two-dimensional code", which is randomly generated when the system is initially run or reset, and is saved in a screenshot at the control end. The system-level high-risk operation is performed after the camera scanning authentication is passed, eliminating the risk of local attack by non-managers and remote attack by hackers when performing such operations. In the desensitization camera, a limiting frame is fixedly installed on one side of the fixed block, a water tank is fixedly installed on the inner wall of the limiting frame, a water pipe is fixedly installed on one side of the water tank, and a sliding column is slidably connected to one side of the limiting frame. When the two fixed blocks move towards each other, the two sliding columns will abut and be pressed, thereby pushing the sliding column towards the water tank, so that one end of the sliding column presses the water tank. At this time, the water in the water tank will flow into the fixed groove of the fixed block through the water pipe, so that the cleaning cloth in the fixed groove is wetted. The cleaning cloth is made of quick-drying fabric and quickly dries when wet. After wiping the lens and the cleaning cloth is dried, an electric push rod is started to wipe the lens with the dried cleaning cloth, thereby wiping off the moisture on the lens.

2. A desensitizing camera for public venues, characterized by: The device is suitable for the desensitization data acquisition method for a public venue as claimed in claim 1. An optical shield (5) is fixedly installed on the outer surface of the desensitization camera body (1). A lens (2) is arranged on one side of the desensitization camera body (1). Two connecting rods (301) are fixedly installed at the bottom end of the desensitization camera body (1). A bottom plate (302) is fixedly installed on one end of the connecting rod (301). Two electric push rods (317) are fixedly installed in the bottom plate (302). A signal receiver (303) is fixedly installed on one side of the electric push rod (317). A fixed block (304) is fixedly installed on one end of the electric push rod (317). A fixed groove (305) is arranged on one side of the fixed block (304). Two elastic bands (307) are fixedly installed on the side wall of the fixed groove (305). A cleaning cloth (306) is arranged in the fixed groove (305).

3. The desensitizing camera lens for public venues of claim 2, wherein: A magic tape sub-surface (308) is fixedly installed on the inner wall of the fixed groove (305). A magic tape mother surface (309) is fixedly installed on one end of the cleaning cloth (306).

4. The desensitizing camera lens for public places according to claim 3, characterized in that: A limiting frame (310) is fixedly installed on one side of the fixed block (304). A water tank (311) is fixedly installed on the inner wall of the limiting frame (310). A water pipe (312) is fixedly installed on one side of the water tank (311). A sliding column (313) is slidably connected to one side of the limiting frame (310).

5. A desensitizing camera for public venues as claimed in claim 4 wherein: One end of the sliding column (313) is fixedly installed with a crash pad (314), and the end of the sliding column (313) away from the crash pad (314) is fixedly installed with a top plate (315).

6. The desensitizing camera lens for public venues of claim 5, wherein: The surface of the sliding column (313) is sleeved with a spring (316), one end of the spring (316) is fixedly installed with the crash pad (314), and the other end of the spring (316) is fixedly installed with the limiting frame (310).

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