Camera, electronic equipment and security monitoring system
By setting up a supplementary lighting module that emits alternating polarized light in the camera, the problem of high reflectivity at night is solved, simplifying operation and reducing costs, making it suitable for security monitoring systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG UNIVIEW TECH CO LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-17
AI Technical Summary
Existing cameras suffer from high reflectivity when shooting under supplemental lighting at night, and the operation process is cumbersome and costly.
The first and second supplementary lighting modules alternately emit polarized light, and supplementary lighting is performed by setting the polarization direction to form an angle, thereby reducing the high reflectivity of the target object surface and eliminating the need for mechanical drive structure.
It simplifies the operation of the camera, reduces costs, facilitates miniaturization, and improves image quality and applicability.
Smart Images
Figure CN224139071U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of image acquisition technology, and in particular to a camera, electronic device and security monitoring system. Background Technology
[0002] A security monitoring system is an independent and complete system that uses fiber optic cables, coaxial cables, or microwaves to transmit video signals within a closed loop. From camera capture to image display and recording, it can provide real-time, vivid, and realistic feedback of the monitored object. It can replace manual monitoring for extended periods in harsh environments, recording the footage via video recorders. A video surveillance and control system (VSCS) refers to an electronic system or network that utilizes video detection technology to monitor protected areas and display and record on-site images in real time.
[0003] Security monitoring systems consist of front-end equipment, transmission networks, back-end processing, and display terminals. Front-end equipment includes cameras and sensors. In nighttime lighting conditions, the working environment of cameras is complex and variable. The presence of highly reflective objects such as eyeglass frames, earrings, necklaces, highly reflective clothing, screens, and railings causes the light from the supplementary lighting to be reflected directly onto the sensors, resulting in overexposure of the image and making facial recognition inaccurate and unstable.
[0004] Currently, cameras used to reduce the high reflectivity of target objects (such as human faces) typically employ a mechanical drive structure. This structure switches a polarizer between being on and off the light path, thus reducing the surface reflectivity. However, this type of camera suffers from drawbacks such as cumbersome operation, high cost, and limitations in miniaturization. Therefore, simplifying camera operation and reducing costs while reducing surface reflectivity is a pressing issue for the industry. Utility Model Content
[0005] This utility model provides a camera, electronic device and security monitoring system to solve the problems of high reflectivity in existing cameras when shooting at night with supplemental lighting, as well as the cumbersome operation process and high cost.
[0006] The first aspect of this utility model provides a camera, comprising:
[0007] The first supplementary lighting module is used to emit second polarized light to supplement the target object;
[0008] The second supplementary lighting module is used to emit third polarized light to supplement the target object;
[0009] The first lens module is used to acquire the first polarized light in the light reflected from the target object in order to photograph the target object;
[0010] The polarization direction of the first polarized light forms a first preset angle with the polarization direction of the second polarized light; the polarization direction of the first polarized light forms a second preset angle with the polarization direction of the third polarized light;
[0011] Wherein, the first preset included angle is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the second preset included angle is greater than or equal to 75 degrees and less than or equal to 105 degrees.
[0012] According to the camera provided by this utility model, the first lens module includes:
[0013] A first lens is used to acquire the first polarized light in order to photograph the target object;
[0014] A lens polarizer is disposed in the incident light path of the first lens to transmit reflected light from the target object to form the first polarized light.
[0015] According to the camera provided by this utility model, the first supplementary lighting module includes:
[0016] The first supplementary light is used to provide supplementary lighting to the target object;
[0017] A first polarizer is disposed in the light path of the first supplementary light to transmit the light emitted by the first supplementary light to form the second polarized light.
[0018] According to the camera provided by this utility model, the second supplementary lighting module includes:
[0019] The second supplementary light is used to provide supplementary lighting to the target object;
[0020] The second polarizer is disposed in the light output path of the second fill light and is used to transmit the light emitted by the second fill light to form the third polarized light.
[0021] According to the camera provided by this utility model, both the first polarizer and the second polarizer are linear polarizers.
[0022] According to the camera provided by this utility model, the first polarizer and the first fill light are arranged at intervals; the second polarizer and the second fill light group are arranged at intervals.
[0023] According to the camera provided by this utility model, at least one of the first fill light and the second fill light is an infrared light.
[0024] The camera provided by this utility model also includes:
[0025] The second lens module is disposed on one side of the first lens module and is used to acquire the reflected light from the target object in order to photograph the target object.
[0026] A second aspect of this invention provides an electronic device including the camera described in any of the preceding claims.
[0027] The third aspect of this utility model provides a security monitoring system, including the camera described in any one of the above claims, or including the electronic equipment described above.
[0028] The camera provided by this utility model, by setting a second supplementary light module, when the second supplementary light module emits third polarized light to supplement the target object, the polarization direction of the high reflectivity on the surface of the target object is almost the same as the polarization direction of the third polarized light, forming a second preset angle with the polarization direction of the first polarized light that the first lens module can obtain, so that the first lens module cannot obtain the high reflectivity, thereby reducing the high reflectivity on the surface of the target object. By setting up a first supplementary lighting module and a second supplementary lighting module, with the first supplementary lighting module emitting second polarized light at a first preset angle to the polarization direction of the first polarized light, and the second supplementary lighting module emitting third polarized light at a second preset angle to the polarization direction of the first polarized light, compared to the existing scheme that uses a mechanical drive structure to drive the polarizer to move, the camera in this embodiment can alternately turn on the first supplementary lighting module and the second supplementary lighting module to provide supplementary lighting to the target object, thereby eliminating the need for a mechanical drive structure. This not only simplifies the operation steps of the camera but also reduces costs, which is beneficial for the miniaturization design of the entire device. It also solves the problems of high reflectivity, cumbersome operation, and high cost of existing cameras when shooting with supplementary lighting at night.
[0029] The electronic device and security monitoring system of this utility model both include the aforementioned camera, and therefore have at least the aforementioned advantages, which will not be elaborated further here. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0031] Figure 1 This is one of the structural schematic diagrams of the camera provided by this utility model.
[0032] Figure 2 This is the second structural schematic diagram of the camera provided by this utility model.
[0033] Figure 3This is a schematic diagram of the structure of the electronic device provided by this utility model.
[0034] Figure label:
[0035] 100. Camera; 200. Image sensor; 300. Processor; 400. Memory; 500. Target object;
[0036] 110. First lens module; 111. First lens; 112. Lens polarizer;
[0037] 120. First supplementary lighting module; 121. First supplementary light; 122. First polarizer;
[0038] 130. Second supplementary lighting module; 131. Second supplementary light; 132. Second polarizer;
[0039] 140. Second lens module. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0041] In the description of the embodiments of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.
[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0044] The following is combined Figure 1 , Figure 2 and Figure 3 The structure and working principle of the camera, electronic device and security monitoring system of this utility model are described in detail.
[0045] like Figure 1 and Figure 2 As shown, a specific embodiment of the first aspect of this utility model provides a camera 100. The camera 100 includes a first lens module 110, a first supplementary light module 120, and a second supplementary light module 130; the first supplementary light module 120 is used to emit second polarized light to supplement the light of a target object 500; the second supplementary light module 130 is used to emit third polarized light to supplement the light of the target object 500; the first lens module 110 is used to acquire the first polarized light in the reflected light from the target object 500 to photograph the target object 500; the polarization direction of the first polarized light and the polarization direction of the second polarized light form a first preset angle, and the polarization direction of the first polarized light and the polarization direction of the third polarized light form a second preset angle; wherein, the first preset angle is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the second preset angle is greater than or equal to 75 degrees and less than or equal to 105 degrees.
[0046] In this embodiment, by setting a second supplementary lighting module 130, when the second supplementary lighting module 130 emits third polarized light to supplement the target object 500, the polarization direction of the high reflectivity on the surface of the target object 500 is almost the same as the polarization direction of the third polarized light, forming a second preset angle with the polarization direction of the first polarized light that the first lens module 110 can obtain, so that the first lens module 110 cannot obtain the high reflectivity, thereby reducing the high reflectivity on the surface of the target object 500. By setting a first supplementary lighting module 120 and a second supplementary lighting module 130, with the first supplementary lighting module 120 emitting second polarized light at a first preset angle to the polarization direction of the first polarized light, and the second supplementary lighting module 130 emitting third polarized light at a second preset angle to the polarization direction of the first polarized light, compared to the existing scheme that uses a mechanical drive structure to drive the polarizer movement, the camera 100 in this embodiment can alternately activate the first supplementary lighting module 120 and the second supplementary lighting module 130 to provide supplementary lighting to the target object 500, thereby eliminating the need for a mechanical drive structure. This not only simplifies the operation steps of the camera 100 but also reduces costs, facilitating the miniaturization of the entire device. It also solves the problems of high reflectivity, cumbersome operation, and high cost associated with existing cameras during nighttime supplementary lighting shooting. Furthermore, the preset angle setting allows the camera 100 to adapt to different reflection environments, expanding the applicability of the camera 100 and enhancing the scalability of the solution.
[0047] When the first supplementary lighting module 120 emits second polarized light to supplement the target object 500, the polarization direction of the light reflected from the surface of the target object 500 is almost the same as that of the second polarized light. The first lens module 110 acquires the first polarized light in the reflected light from the surface of the target object 500, which can enhance the effective light intake of the target object 500.
[0048] It is understandable that the first polarized light, which forms a first preset angle with the polarization direction of the second polarized light, can be captured by the first lens module 110 to achieve supplementary lighting. The first polarized light, which forms a second preset angle with the polarization direction of the third polarized light, cannot be captured by the first lens module 110 to achieve the purpose of reducing the high reflectivity of the target object 500 surface.
[0049] Optionally, the first preset angle can be 0 degrees, in which case the polarization direction of the first polarized light is parallel to the polarization direction of the second polarized light; the first preset angle can be 15 degrees, or any value between 0 and 15 degrees.
[0050] Optionally, the second preset angle can be 75 degrees, 105 degrees, or any value between 75 degrees and 105 degrees. Preferably, the second preset angle is 90 degrees, which can maximize the blocking of vertically polarized reflected light.
[0051] In some embodiments, the first lens module 110 includes a first lens 111 and a lens polarizer 112; the first lens 111 is used to acquire first polarized light to photograph the target object 500. The lens polarizer 112 is disposed in the incident light path of the first lens 111 and is used to transmit the reflected light from the target object 500 to form first polarized light. The incident light path refers to the light path composed of the first polarized light in the reflected light from the target object 500.
[0052] In this embodiment, by setting a lens polarizer 112 in the incident light path of the first lens 111, the lens polarizer 112 can directly filter stray light that is not in the target polarization direction, allowing reflected light that matches the polarization direction of the supplementary light to enter the first lens 111, thereby reducing noise at the receiving end and improving the signal-to-noise ratio of nighttime imaging. By setting a lens polarizer 112 in the incident light path of the first lens 111, it is also compatible with existing lens assembly processes. Without developing new lenses, it can work in conjunction with the first supplementary light module 120 and the second supplementary light module 130 to physically alleviate high reflectivity at the optical level, thereby reducing the algorithm burden.
[0053] It is understandable that the transmission axis of the lens polarizer 112 is the same as the polarization direction of the first polarized light.
[0054] It should be noted that the first lens module 110 can be a modular design, such as integrating the first lens 111 with the lens polarizer 112. The first lens module 110 can also be a separate design, such as spacing the first lens 111 and the lens polarizer 112 apart.
[0055] Optionally, a lens polarizer 112 is disposed on the light-incident surface of the first lens 111. In other words, a polarizing mode is formed on the light-incident surface of the first lens 111, which can be used for the first polarized light in the light reflected from the target object 500.
[0056] Optionally, along the incident light path of the first lens 111, the lens polarizer 112 is arranged at intervals with the first lens 111. The interval arrangement can avoid multiple reflections of stray light between the lens polarizer 112 and the lens elements, thereby improving the imaging contrast.
[0057] Specifically, the first lens module 110 includes a first lens 111 and a lens polarizer 112; the lens polarizer 112 is a linear polarizer; along the incident light path of the first lens 111, the lens polarizer 112 and the first lens 111 are arranged at intervals. The reflected light from the target object 500 passes through the lens polarizer 112 to form first polarized light, which is captured by the first lens 111. The first lens 111 focuses the acquired first polarized light to form an optical image, thereby capturing the target object 500.
[0058] In some embodiments, the first supplementary lighting module 120 includes a first supplementary light 121 and a first polarizer 122; the first supplementary light 121 is used to provide supplementary light to the target object 500; the first polarizer 122 is disposed in the light output path of the first supplementary light 121, and is used to transmit the light emitted by the first supplementary light 121 to form second polarized light. The light output path of the first supplementary light 121 is the light path composed of the light emitted by the first supplementary light 121 and the second polarized light.
[0059] In this embodiment, the first polarizer 122 converts the unpolarized light emitted by the first supplementary light lamp 121 into linearly polarized light (second polarized light), the polarization direction of which forms a first preset angle with the polarization direction of the first polarized light that can be received by the first lens 111. The first polarized light in the light reflected from the target object 500 can pass through the lens polarizer 112, improving the signal-to-noise ratio. The first polarizer 122 filters out invalid polarization components, concentrating the supplementary light energy on the target polarization direction (i.e., the polarization direction of the first polarized light), reducing the supplementary light lamp power required to achieve the same brightness.
[0060] It is understood that the transmission axis of the first polarizer 122 is the same as the polarization direction of the second polarized light. The polarization direction of the first polarized light and the polarization direction of the second polarized light form a first preset angle. In other words, the transmission axis of the lens polarizer 112 and the transmission axis of the first polarizer 122 form a first preset angle.
[0061] Preferably, the light transmission axis of the lens polarizer 112 forms a first preset angle of 0 degrees with the light transmission axis of the first polarizer 122, that is, the light transmission axis of the lens polarizer 112 is parallel to the light transmission axis of the first polarizer 122.
[0062] It should be noted that the first supplementary lighting module 120 can be a modular design, such as an integrated design of the first supplementary light 121 and the first polarizer 122. The first supplementary lighting module 120 can also be a separate design, such as an alternating design of the first supplementary light 121 and the first polarizer 122.
[0063] Optionally, a first polarizer 122 is disposed on the light-emitting surface of the first supplementary light 121. In other words, a polarization mode is formed on the light-emitting surface of the first supplementary light 121, and the polarization mode can transmit the light emitted by the first supplementary light 121 to form second polarized light.
[0064] Optionally, along the light output path of the first supplementary light 121, the first polarizer 122 is arranged at intervals with the first supplementary light 121. The first supplementary light 121 generates heat during operation; the interval design prevents the first polarizer 122 from being directly heated, thus preventing temperature rise that could cause deformation of the polarization film or changes in refractive index. The interval space allows the supplementary light to be fully diffused before passing through the first polarizer 122, avoiding polarization inhomogeneity in the near-field region of the light source. The interval design allows for a wider range of installation errors between the first polarizer 122 and the first supplementary light 121, reducing assembly precision requirements and improving yield. The first polarizer 122 can be disassembled and cleaned or replaced individually without replacing the entire supplementary lighting module, reducing maintenance costs. Furthermore, the interval arrangement also allows for the insertion of waveplates to convert linearly polarized light into circularly polarized light, making it suitable for different scenarios.
[0065] Optionally, the first supplementary light 121 can be a white light or an infrared light. This embodiment does not limit the specific supplementary lighting form of the first supplementary light 121.
[0066] Optionally, the first polarizer 122 can be a linear polarizer.
[0067] Optionally, the first supplementary lighting module 120 may include at least two first supplementary lights 121 and a first polarizer 122. The light emitted from the two first supplementary lights 121 passes through the first polarizer 122 to form second polarized light, which is used to supplement the target object 500.
[0068] Optionally, the first fill light module 120 includes at least two first fill light lamps 121 and at least two first polarizers 122, with each first polarizer 122 corresponding to one of the first fill light lamps 121. The first fill light lamps 121 can be arranged around the incident light path of the first lens module 110; in other words, the first fill light lamps 121 can be arranged around the central axis of the first lens 111.
[0069] Specifically, the first supplementary lighting module 120 includes a first supplementary light 121 and a first polarizer 122; the first polarizer 122 is a linear polarizer; along the light output path of the first supplementary light 121, the first polarizer 122 and the first supplementary light 121 are arranged at intervals; the light emitted from the first supplementary light 121 passes through the first polarizer 122 to form second polarized light, and the second polarized light illuminates the target object 500 to provide supplementary lighting to the target object 500.
[0070] In some embodiments, the second supplementary lighting module 130 includes a second supplementary light 131 and a second polarizer 132; the second supplementary light 131 is used to provide supplementary lighting to the target object 500; the second polarizer 132 is disposed in the light output path of the second supplementary light 131, and is used to transmit the light emitted by the second supplementary light 131 to form third polarized light. The light output path of the second supplementary light 131 is the light path composed of the light emitted by the second supplementary light 131 and the third polarized light.
[0071] In this embodiment, the second polarizer 132 converts the unpolarized light emitted by the second supplementary light 131 into linearly polarized light (third polarized light), and its polarization direction forms a second preset angle with the first polarized light, which can reduce the high reflectivity of the target object 500.
[0072] It is understandable that the transmission axis of the second polarizer 132 is the same as the polarization direction of the third polarized light. The polarization direction of the first polarized light and the polarization direction of the third polarized light form a second preset angle. In other words, the transmission axis of the lens polarizer 112 and the transmission axis of the second polarizer 132 form a second preset angle.
[0073] Preferably, the light transmission axis of the lens polarizer 112 forms a second preset angle of 90 degrees with the light transmission axis of the second polarizer 132, that is, the light transmission axis of the lens polarizer 112 is perpendicular to the light transmission axis of the second polarizer 132.
[0074] It should be noted that the second supplementary lighting module 130 can be a modular design, such as an integrated design of the second supplementary light 131 and the second polarizer 132. The second supplementary lighting module 130 can also be a separate design, such as an interleaved design of the second supplementary light 131 and the second polarizer 132.
[0075] Optionally, a second polarizer 132 is disposed on the light-emitting surface of the second supplementary light 131. In other words, a polarization mode is formed on the light-emitting surface of the second supplementary light 131, which can transmit the light emitted by the second supplementary light 131 to form third polarized light.
[0076] Optionally, the second polarizer 132 is spaced apart from the second fill light 131 along the light output path of the second fill light 131. The second fill light 131 generates heat during operation; the spaced arrangement prevents the second polarizer 132 from being directly heated, thus preventing temperature rise that could cause deformation of the polarizing film or changes in refractive index. The space allows the fill light to be fully diffused before passing through the second polarizer 132, avoiding polarization inhomogeneity in the near-field region of the light source. The spaced arrangement allows for a wider range of installation errors between the second polarizer 132 and the second fill light 131, reducing assembly precision requirements and improving yield. The second polarizer 132 can be disassembled and cleaned or replaced individually without replacing the entire fill light module, reducing maintenance costs. Furthermore, the spaced arrangement also allows for the insertion of waveplates to convert linearly polarized light into circularly polarized light, making it suitable for different scenarios.
[0077] Optionally, the second supplementary light 131 can be a white light or an infrared light. This embodiment does not limit the specific supplementary lighting form of the second supplementary light 131.
[0078] Optionally, the second polarizer 132 can be a linear polarizer.
[0079] Optionally, the second supplementary lighting module 130 may include at least two second supplementary lights 131 and a second polarizer 132. The light emitted from the two second supplementary lights 131 passes through the second polarizer 132 to form third polarized light, which illuminates the target object 500.
[0080] Optionally, the second fill light module 130 includes at least two second fill light lamps 131 and at least two second polarizers 132, with each second polarizer 132 corresponding to one of the second fill light lamps 131. The second fill light lamps 131 can be arranged around the output light path of the first lens module 110; in other words, the second fill light lamps 131 can be arranged around the central axis of the first lens 111.
[0081] Specifically, the second supplementary lighting module 130 includes a second supplementary light 131 and a second polarizer 132; the second polarizer 132 is a linear polarizer; along the light output path of the second supplementary light 131, the second polarizer 132 and the second supplementary light 131 are arranged at intervals; the light emitted from the second supplementary light 131 passes through the second polarizer 132 to form third polarized light, which illuminates the target object 500 to provide supplementary lighting for the target object 500. Among the reflected light from the target object 500, only the first polarized light, which is almost parallel to the polarization direction of the lens polarizer 112, can pass through the lens polarizer 112, while the polarization direction of the third polarized light forms a second preset angle with the polarization direction of the lens polarizer 112, or even is perpendicular to it, thus reducing the high reflectivity of the target object 500.
[0082] In some embodiments, at least one of the first supplementary light 121 and the second supplementary light 131 is an infrared light. Infrared lights have strong penetrating power and can still have a high imaging effect after brightness decay, which can reduce the impact of polarization on image quality.
[0083] In some embodiments, the camera 100 further includes a second lens module 140; the second lens module 140 is disposed on one side of the first lens module 110 and is used to photograph the target object 500 to obtain the reflected light of the target object 500.
[0084] In this embodiment, by setting the second lens module 140 to work in conjunction with the first lens module 110, multi-angle images of the target object 500 can be acquired. Depth information is calculated using existing parallax calculation methods to assist in determining the actual contour of highly reflective areas. The first lens module 110 (polarized light imaging) captures surface details, while the second lens module 140 provides an ambient light reference; the fusion significantly reduces the false positive rate. When the first lens module 110 fails due to strong light saturation or contamination of the lens polarizer 112, the second lens module 140 can serve as a backup imaging unit, improving system robustness. Furthermore, by adding the second lens module 140, the shooting frame rate can be halved, enabling real-time imaging, and the second lens module 140 is unaffected by the polarizer.
[0085] Optionally, the second lens module 140 includes a second lens. The second lens can be used for real-time imaging and for acquiring the metering area. A low-cost first lens 111 can be used to acquire the first polarized light, while a high-cost second lens can be used for real-time imaging, reducing costs while improving image quality.
[0086] like Figure 3 As shown, a specific embodiment of the second aspect of this utility model provides an electronic device. This electronic device includes a camera 100 from any of the above embodiments.
[0087] The electronic device in this embodiment includes the camera 100 of any of the above embodiments, and therefore has at least the advantages described above.
[0088] Furthermore, the electronic device also includes an image sensor 200; the image sensor 200 is connected to the first lens 111; the first lens 111 is used to acquire the first polarized light in the reflected light from the target object 500, and to focus the first polarized light to form an optical image; the image sensor 200 is used to convert the optical image into an electrical signal and output the raw image data for subsequent processing.
[0089] Furthermore, the electronic device also includes a processor 300; the processor 300 is electrically connected to the image sensor 200; the processor 300 is used to process the raw image data transmitted by the image sensor 200.
[0090] Furthermore, the electronic device also includes a memory 400; the memory 400 is electrically connected to the processor 300 and is used to store processed image data output by the processor 300. The processed image data includes image photographs.
[0091] It should be noted that electronic devices can be smart devices with photographic capabilities. For example, electronic devices can be cameras, mobile phones, computers, tablets, or other smart devices with camera functions.
[0092] Preferably, the electronic device is a camera or a mobile phone.
[0093] The image processing method of the electronic device of this invention will be described in detail below in conjunction with existing image processing methods.
[0094] The first supplementary lighting module 120 and the second supplementary lighting module 130 of the camera 100 work alternately. When the first supplementary lighting module 120 is working to emit second polarized light to supplement the target object 500, the first polarized light in the reflected light from the target object 500 passes through the lens polarizer 112 and is captured by the first lens 111. The first lens 111 focuses the first polarized light to form a first polarized optical image. The image sensor 200 transmits the first polarized optical image to the processor 300. When the second supplementary lighting module 130 is working to emit third polarized light to supplement the target object 500, the first polarized light in the reflected light from the target object 500 passes through the lens polarizer 112, while filtering out light parallel to the third polarized light, thereby reducing high reflectivity. The first lens 111 captures the first polarized light at this time and focuses it to form a second polarized optical image. The image sensor 200 transmits the second polarized optical image to the processor 300.
[0095] Based on the two polarized optical images mentioned above, processor 300 uses the following algorithm to calculate the complete polarization saliency information of the scene. This algorithm can accurately identify and distinguish highly reflective object areas that are not human faces. By intelligently segmenting the captured recognition image into two independent metering zones, the metering weight of areas that are difficult to expose using the following algorithm is not considered to avoid adversely affecting the overall exposure value.
[0096] If the lens used to calculate the imaging area is a monochrome lens or an infrared lens, the algorithm is as follows:
[0097]
[0098] In the formula, This is a monochrome scene image captured by a camera under the illumination of its linear polarization angle supplementary light (i.e., under the illumination of the first supplementary light module). This is a monochrome scene image captured by a camera under supplemental lighting from a different linear polarization angle lamp (i.e., under supplemental lighting from a second supplemental lighting module).
[0099] If the lens used to calculate the imaging area is a color lens, the algorithm is as follows:
[0100] ;
[0101] ;
[0102] In the formula, , , The images shown are scene images with R, G, and B channels captured by the first lens under the illumination of the first polarized fill light (i.e., under the illumination of the first fill light module). This is the calculated monochrome scene image.
[0103] , , The images shown are scene images with R, G, and B channels captured by a camera under supplementary lighting from a different linearly polarized angle supplementary light (i.e., under supplementary lighting from a second supplementary lighting module). This is the calculated monochrome scene image.
[0104]
[0105] The calculated complete polarization saliency information is used to identify highly reflective areas that are not human faces.
[0106] The complete polarization saliency information calculated using the above method is affected by noise, therefore binarization is required to divide it into two regions. The algorithm is as follows:
[0107]
[0108] This is a threshold parameter; the threshold can be adjusted freely depending on the scenario. Generally, a value of 0.5 is acceptable; the smaller the value, the more metering areas are ignored. Areas that result in a value of 1 after binarization are considered difficult to image, so their metering weight is reduced or they are excluded from metering altogether to avoid the impact of highly reflective areas on the quality of face imaging. Areas that result in a value of 0 after binarization have their metering weight increased or are metered separately to obtain images with a high signal-to-noise ratio.
[0109] Specifically, the electronic device includes a processor 300, an image sensor 200, and a camera 100. The camera 100 includes a first lens module 110, a first supplementary lighting module 120, and a second supplementary lighting module 130. The transmission axis of the lens polarizer 112 forms a first preset angle of 0 degrees with the transmission axis of the first polarizer 122 (i.e., the transmission axis of the lens polarizer 112 is parallel to the transmission axis of the first polarizer 122), and the transmission axis of the lens polarizer 112 forms a second preset angle of 90 degrees with the transmission axis of the second polarizer 132 (i.e., the transmission axis of the lens polarizer 112 is parallel to the transmission axis of the second polarizer 132). When supplementing light to the target object 500, the first supplementary light 121 and the second supplementary light 131 can alternately project orthogonally linearly polarized light onto the target object 500, forming a stable, fully polarized light environment. Two images under different polarization illuminations are acquired by the first lens 111 using the attached polarizer 112. Existing image processing algorithms are then used to analyze the images and extract calculated polarization saliency information. Based on this information, the imaging is divided into regions where imaging is more difficult and metering regions that participate in subsequent photometric measurements. Real-time imaging is then performed using the calculated metering regions.
[0110] When the first supplementary light 121 illuminates the target object 500 (e.g., a human face), the polarization state changes according to the surface characteristics of the target object 500 during refraction or reflection. Common highly reflective objects, such as metallic objects or objects with smooth surfaces that produce specular reflection, will maintain almost the same linear polarization state when reflecting linearly polarized light, thus being captured by the lens polarizer 112 with the same linear polarization state. In diffuse reflection areas where imaging is easy, the linearly polarized light is modulated into unpolarized light and captured by the lens. During this process, the light intensity in this area can be halved for the same exposure time. Similarly, when the second orthogonally linearly polarized supplementary light 131 illuminates, the brightness of the diffuse reflection area of the "human face" captured by the camera 100 is the same as that of the first supplementary light 121 (i.e., 0 after subtraction), while the orthogonally polarized light on the surface of a highly reflective object is completely filtered by the lens polarizer 112 (i.e., remains unchanged after subtraction). This algorithm allows two images with significant differences to be used to determine the subsequent metering weight allocation. This means ignoring overexposed areas that are not human faces to avoid affecting metering and thus reducing image quality.
[0111] A third aspect of this utility model provides a security monitoring system. This security monitoring system includes a camera 100 as described in any of the above embodiments, or includes an electronic device as described in any of the above embodiments.
[0112] The security monitoring system in this embodiment has at least the advantages mentioned above, which will not be elaborated further here.
[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A camera, characterized by, include: The first supplementary lighting module (120) is used to emit second polarized light to supplement the target object (500); The second supplementary lighting module (130) is used to emit third polarized light to supplement the target object (500); The first lens module (110) is used to acquire the first polarized light in the reflected light of the target object (500) in order to photograph the target object (500). The polarization direction of the first polarized light forms a first preset angle with the polarization direction of the second polarized light, and the polarization direction of the first polarized light forms a second preset angle with the polarization direction of the third polarized light; Wherein, the first preset included angle is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the second preset included angle is greater than or equal to 75 degrees and less than or equal to 105 degrees.
2. The camera of claim 1, wherein, The first lens module (110) includes: A first lens (111) is used to acquire the first polarized light in order to photograph the target object (500). A lens polarizer (112) is disposed on the incident light path of the first lens (111) to transmit the reflected light from the target object (500) to form the first polarized light.
3. The camera of claim 1, wherein, The first supplementary lighting module (120) includes: The first supplementary light (121) is used to provide supplementary light to the target object (500); A first polarizer (122) is disposed on the light output path of the first supplementary light (121) to transmit the light emitted by the first supplementary light (121) to form the second polarized light.
4. The camera of claim 3, wherein, The second supplementary lighting module (130) includes: The second supplementary light (131) is used to provide supplementary light to the target object (500); The second polarizer (132) is disposed in the light output path of the second supplementary light (131) and is used to transmit the light emitted by the second supplementary light (131) to form the third polarized light.
5. The camera of claim 4, wherein, Both the first polarizer (122) and the second polarizer (132) are linear polarizers.
6. The camera of claim 4, wherein, The first polarizer (122) is arranged at intervals with the first fill light (121); the second polarizer (132) is arranged at intervals with the second fill light (131).
7. The camera of claim 4, wherein, At least one of the first supplementary light (121) and the second supplementary light (131) is an infrared light.
8. The camera according to any one of claims 1 to 7, characterized in that, Also includes: The second lens module (140) is disposed on one side of the first lens module (110) and is used to acquire the reflected light of the target object (500) to photograph the target object (500).
9. An electronic device, comprising: Includes the camera (100) as described in any one of claims 1 to 8.
10. A security monitoring system, characterized by It includes the camera (100) as described in any one of claims 1 to 8, or the electronic device as described in claim 9.