Privacy protection camera based on optical engineering scattering sheet and privacy protection method thereof

Abstract

The application discloses a privacy protection camera based on an optical engineering scattering sheet and a privacy protection method thereof, and comprises a camera module, wherein the camera module is installed with an engineering scattering sheet, the engineering scattering sheet is made of POG material, the divergence angle of the engineering scattering sheet is 1+ / -0.5 degrees, the light transmittance of the engineering scattering sheet is greater than 85%, the POG material comprises a glass substrate and a surface polymer microlens array layer, and the surface polymer microlens array layer is randomly distributed and has a height difference of 0-2 microns; the application does not need a complex algorithm, realizes sensitive detail blurring through optical regulation and control of the engineering scattering sheet, and has a much higher cracking difficulty than a digital algorithm; through controllable scattering, only details are blurred, and the overall contour and motion recognition are not affected; a circular diffusion spot ensures uniform diffusion of facial details, and a controllable diffusion angle can balance the privacy and recognition requirements; the POG material architecture combines the high stability of glass and the microstructure precision of polymer, the light transmittance is greater than 85%, which is better than that of ground glass which is less than 70%, and there is no deformation in long-term use.

Description

Technical Field

[0001] This invention relates to the field of security monitoring technology, specifically to a privacy-protecting camera based on an optical engineering scattering sheet and its privacy protection method. Background Technology

[0002] Privacy-protecting cameras are specially designed camera devices whose core objective is to minimize or completely avoid collecting personally identifiable information and sensitive privacy data while performing surveillance or visual perception functions (such as detecting people or activities).

[0003] The shortcomings of existing technology: Currently, traditional pixel blurring algorithms (such as mosaic) rely on computing power, have poor real-time performance, and are easily cracked; ordinary frosted glass blurring completely hides all image details, making it impossible to identify the general shape of objects, and its poor light transmission affects the working performance of cameras. Conventional diffusers are mostly made of a single polymer or glass material, with uncontrollable scattering angles and irregular light spot shapes, failing to achieve "precise privacy protection"; existing diffuser materials lack stability and are prone to microstructural deformation after high temperatures or long-term use, leading to a decrease in scattering effect. Summary of the Invention

[0004] The purpose of this invention is to provide a privacy-protecting camera based on an optical engineering scattering sheet and a privacy protection method thereof, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a privacy protection camera based on an optical engineering scattering sheet, comprising a camera module, wherein the camera module is equipped with an engineering scattering sheet, the engineering scattering sheet is made of POG material, the divergence angle of the engineering scattering sheet is 1±0.5°, the transmittance of the engineering scattering sheet is >85%, the POG material comprises a glass substrate and a surface polymer microlens array layer, the surface polymer microlens array layer is randomly distributed and the height difference is 0~2μm.

[0006] Preferably, the engineered diffuser sheet is fixed to the surface of the camera module by coating it with an adhesive.

[0007] Preferably, the camera module has a slot that matches the engineering diffuser, and the engineering diffuser is fixed to the camera module by fitting into the slot.

[0008] Preferably, the camera module includes a lens assembly and an image sensor.

[0009] This invention also provides a privacy protection method for a privacy-protecting camera based on an optical engineering scattering sheet, the privacy protection method specifically including: S1. Prepare core components with specific parameters; S2. Install and secure the engineering diffuser sheet; S3. Optical control of light passing through an engineering diffuser; S4. The imaging system outputs images with privacy protection features.

[0010] Preferably, the core components in step S1 include a camera module and an engineering diffuser.

[0011] Preferably, step S2 specifically involves fixing the engineering diffuser to the camera module, with the microstructure surface of the engineering diffuser facing the image sensor.

[0012] Preferably, step S3 specifically includes: a1. Ambient light is incident on the surface of the engineering diffuser sheet and contacts the microlens array layer; a2. Light is refracted under the action of the microlens array layer and diffuses towards the lens group at a divergence angle of 1±0.5°. a3. The diffused light enters the lens group and is then projected onto the image sensor, spreading and covering more than 5 pixels with a coverage area of ​​≥5μm. This causes the imaging pixels of facial details to overlap, resulting in a blurring effect.

[0013] Preferably, step a4 specifically involves: the diffused light is focused onto the surface of the image sensor, the image sensor converts the light signal into an electrical signal, and in the output image, the object details are blurred due to the diffusion of light, the imaging of a single detail point covers more than 3 pixels, exceeding the detail resolution threshold of the human eye and conventional recognition algorithms, while the overall outline of the object is preserved due to the small divergence angle of the engineering scattering sheet.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This privacy-protecting camera and its privacy protection method, based on an optical engineering scattering sheet, does not require complex algorithms. It achieves blurred sensitive details through optical control of the engineering scattering sheet, making it far more difficult to crack than digital algorithms. Through controllable scattering, it only blurs details without affecting the overall outline and motion recognition, making it suitable for security scenarios. The circular diffusion spot ensures uniform diffusion of facial details, and the controllable diffusion angle (1±0.5°) can balance privacy and recognition needs. The POG material structure combines the high stability of glass with the microstructure precision of polymers, with a light transmittance of >85%, which is better than the <70% of frosted glass, and it does not deform after long-term use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the overall structure of Embodiment 3 of the present invention.

[0016] In the diagram: 1. Camera module; 2. Engineering diffuser; 3. Image sensor. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integrated connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0020] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0021] Example 1 Please see Figure 1As shown, the privacy protection camera technology solution based on an optical engineering diffuser provided by the present invention includes a camera module 1, on which an engineering diffuser 2 is installed. The engineering diffuser 2 is made of POG material, the divergence angle of the engineering diffuser 2 is 1±0.5°, and the light transmittance of the engineering diffuser 2 is >85%. The POG material includes a glass substrate and a surface polymer microlens array layer. The glass substrate provides mechanical stability and high temperature resistance. The surface polymer microlens array layer is randomly distributed and has a height difference of 0~2μm, which has both controllability and optical consistency. The engineering diffuser 2 is fixed to the surface of the camera module 1 by coating an adhesive, or by opening a slot in the camera module 1 that matches the engineering diffuser 2. The engineering diffuser 2 is fixed to the camera module 1 by matching the slot. After external light passes through the engineering diffuser 2, the angle diverges. When it reaches the image sensor 3, the light that originally fell on one pixel falls on more pixels. The camera module 1 includes a lens group and an image sensor 3. After passing through the engineering diffuser 2, the light forms a circular diffuse spot with a divergence angle of 1±0.5°, which makes the facial details uniformly broadened to more than three times the size of the image sensor 3 pixels. Through the directional design of the surface polymer microlens array layer, a linear diffuse spot is achieved. Furthermore, by adjusting the curvature and distribution density of the microlenses, the diffusion angle can be controlled and adjusted, achieving the effect that personal features cannot be distinguished by the naked eye, but behavioral actions can be identified.

[0022] This invention also provides a privacy protection method for a privacy-protecting camera based on an optical engineering scattering sheet, the privacy protection method specifically including: S1. Prepare core components with specific parameters. The core components include camera module 1 and engineering diffuser 2. S2. Install and fix the engineering diffuser 2: Fix the engineering diffuser 2 to the camera module 1, with the microstructure surface of the engineering diffuser 2 facing the image sensor 3. S3, Optical control of light passing through engineering scattering sheet 2; a1. Ambient light is incident on the surface of the engineering diffuser 2 and contacts the microlens array layer; a2. Light is refracted by the microlens array layer and diffuses towards the lens group at a divergence angle of 1±0.5°. a3. The diverged light enters the lens group and is then projected onto the image sensor 3, spreading and covering more than 5 pixels with a coverage area of ​​≥5μm. This causes the imaging pixels of facial details to overlap, resulting in a blurring effect. S4. Imaging system outputs an image with privacy protection effect: The diffused light is focused on the surface of the image sensor 3. The image sensor 3 converts the light signal into an electrical signal. In the output image, the details of the object are blurred due to the diffusion of light. The imaging of a single detail point covers more than 3 pixels, which exceeds the detail resolution threshold of the human eye and conventional recognition algorithms. However, the overall outline of the object is preserved because the divergence angle of the engineering scattering sheet is small.

[0023] Example 2 Please see Figure 2 As shown, the privacy protection camera technology solution based on an optical engineering diffuser provided by the present invention includes a camera module 1, on which an engineering diffuser 2 is installed. The engineering diffuser 2 is made of POG material, the divergence angle of the engineering diffuser 2 is 1±0.5°, and the light transmittance of the engineering diffuser 2 is >85%. The POG material includes a glass substrate and a surface polymer microlens array layer. The glass substrate provides mechanical stability and high temperature resistance, and the surface polymer microlens array layer is randomly distributed with a height difference of 0~2μm, which has both controllability and optical consistency. The engineering diffuser 2 is fixed at the aperture position of the camera module 1. After external light passes through the engineering diffuser 2, the angle diverges, and when it reaches the image sensor 3, the light that originally fell on one pixel falls on more pixels. The camera module 1 includes a lens group and an image sensor 3. After passing through the engineering diffuser 2, the light forms a circular diffuse spot with a divergence angle of 1±0.5°, which makes the facial details uniformly broadened to more than three times the size of the image sensor 3 pixels. Through the directional design of the surface polymer microlens array layer, a linear diffuse spot is achieved. Furthermore, by adjusting the curvature and distribution density of the microlenses, the diffusion angle can be controlled and adjusted, achieving the effect that personal features cannot be distinguished by the naked eye, but behavioral actions can be identified.

[0024] This invention also provides a privacy protection method for a privacy-protecting camera based on an optical engineering scattering sheet, the privacy protection method specifically including: S1. Prepare core components with specific parameters. The core components include camera module 1 and engineering diffuser 2. S2. Install and fix the engineering diffuser 2: Fix the engineering diffuser 2 to the camera module 1, with the microstructure surface of the engineering diffuser 2 facing the image sensor 3. S3, Optical control of light passing through engineering scattering sheet 2; a1. Ambient light is incident on the surface of the engineering diffuser 2 and contacts the microlens array layer; a2. Light is refracted by the microlens array layer and diffuses towards the lens group at a divergence angle of 1±0.5°. a3. The diverged light enters the lens group and is then projected onto the image sensor 3, spreading and covering more than 5 pixels with a coverage area of ​​≥5μm. This causes the imaging pixels of facial details to overlap, resulting in a blurring effect. S4. Imaging system outputs an image with privacy protection effect: The diffused light is focused on the surface of the image sensor 3. The image sensor 3 converts the light signal into an electrical signal. In the output image, the details of the object are blurred due to the diffusion of light. The imaging of a single detail point covers more than 3 pixels, which exceeds the detail resolution threshold of the human eye and conventional recognition algorithms. However, the overall outline of the object is preserved because the divergence angle of the engineering scattering sheet is small.

[0025] Example 3 Please see Figure 3 As shown, the privacy protection camera technology solution based on an optical engineering diffuser provided by the present invention includes a camera module 1, on which an engineering diffuser 2 is installed. The engineering diffuser 2 is made of POG material, the divergence angle of the engineering diffuser 2 is 1±0.5°, and the light transmittance of the engineering diffuser 2 is >85%. The POG material includes a glass substrate and a surface polymer microlens array layer. The glass substrate provides mechanical stability and high temperature resistance, and the surface polymer microlens array layer is randomly distributed with a height difference of 0~2μm, which has both controllability and optical consistency. The engineering diffuser 2 is fixed between the camera module 1 and the image sensor 3. After external light passes through the engineering diffuser 2, the angle diverges, and when it reaches the image sensor 3, the light that originally fell on one pixel falls on more pixels. The camera module 1 includes a lens group and an image sensor 3. After passing through the engineering diffuser 2, the light forms a circular diffuse spot with a divergence angle of 1±0.5°, which makes the facial details uniformly broadened to more than three times the size of the image sensor 3 pixels. Through the directional design of the surface polymer microlens array layer, a linear diffuse spot is achieved. Furthermore, by adjusting the curvature and distribution density of the microlenses, the diffusion angle can be controlled and adjusted, achieving the effect that personal features cannot be distinguished by the naked eye, but behavioral actions can be identified.

[0026] This invention also provides a privacy protection method for a privacy-protecting camera based on an optical engineering scattering sheet, the privacy protection method specifically including: S1. Prepare core components with specific parameters. The core components include camera module 1 and engineering diffuser 2. S2. Install and fix the engineering diffuser 2: Fix the engineering diffuser 2 to the camera module 1, with the microstructure surface of the engineering diffuser 2 facing the image sensor 3. S3, Optical control of light passing through engineering scattering sheet 2; a1. Ambient light is incident on the surface of the engineering diffuser 2 and contacts the microlens array layer; a2. Light is refracted by the microlens array layer and diffuses towards the lens group at a divergence angle of 1±0.5°. a3. The diverged light enters the lens group and is then projected onto the image sensor 3, spreading and covering more than 5 pixels with a coverage area of ​​≥5μm. This causes the imaging pixels of facial details to overlap, resulting in a blurring effect. S4. Imaging system outputs an image with privacy protection effect: The diffused light is focused on the surface of the image sensor 3. The image sensor 3 converts the light signal into an electrical signal. In the output image, the details of the object are blurred due to the diffusion of light. The imaging of a single detail point covers more than 3 pixels, which exceeds the detail resolution threshold of the human eye and conventional recognition algorithms. However, the overall outline of the object is preserved because the divergence angle of the engineering scattering sheet is small.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A privacy-protecting camera based on an optical engineering scattering sheet, comprising a camera module (1), characterized in that: The camera module (1) is equipped with an engineering scattering sheet (2), which is made of POG material. The divergence angle of the engineering scattering sheet (2) is 1±0.5°, and the transmittance of the engineering scattering sheet (2) is >85%. The POG material includes a glass substrate and a surface polymer microlens array layer. The surface polymer microlens array layer is randomly distributed and has a height difference of 0~2μm. In the image output by the camera, the details of the object are blurred due to the diffusion of light, and the imaging of a single detail point covers more than 3 pixels, which exceeds the detail resolution threshold of the human eye and recognition algorithm. However, the overall outline of the object is preserved because the divergence angle of the engineering scattering sheet is small.

2. The privacy protection camera based on an optical engineering scattering sheet according to claim 1, characterized in that: The surface of the camera module (1) is fixed with an adhesive to the engineering diffuser sheet (2).

3. The privacy protection camera based on an optical engineering scattering sheet according to claim 1, characterized in that: The camera module (1) has a slot that matches the engineering diffuser (2), and the engineering diffuser (2) is fixed to the camera module (1) by cooperating with the slot.

4. The privacy protection camera based on an optical engineering scattering sheet according to claim 1, characterized in that: The camera module (1) includes a lens assembly and an image sensor (3).

5. A privacy protection method using a privacy-protecting camera, wherein the privacy-protecting camera is a privacy-protecting camera based on an optical engineering scattering sheet as described in any one of claims 1-4, characterized in that: The privacy protection methods specifically include: S1. Prepare core components with specific parameters, including a camera module (1) and an engineering diffuser (2). S2. Install and fix the engineering diffuser (2); S3, Optical control of light passing through engineering diffuser (2); S4. The imaging system outputs images with privacy protection. Specifically, step S3 includes: a1. Ambient light is incident on the surface of the engineering diffuser (2) and contacts the microlens array layer; a2. Light is refracted by the microlens array layer and diffuses towards the lens group at a divergence angle of 1±0.5°. a3. The diverged light enters the lens assembly and is then projected onto the image sensor (3). Specifically, step S4 involves the following steps: the diffused light is focused onto the surface of the image sensor (3), the image sensor (3) converts the light signal into an electrical signal, and the details of the object in the output image are blurred due to the diffusion of light. The imaging of a single detail point covers more than 3 pixels, which exceeds the detail resolution threshold of the human eye and the recognition algorithm. The overall outline of the object is preserved because the divergence angle of the engineering scattering sheet is small.

6. The privacy protection method using a privacy-protecting camera according to claim 5, characterized in that: The specific step S2 is as follows: the engineering scattering sheet (2) is fixed to the camera module (1), and the microstructure surface of the engineering scattering sheet (2) faces the image sensor (3).

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