CN113905149A

CN113905149A - Optical filter structure, lens, sensor, camera, electronic apparatus, and control method

Info

Publication number: CN113905149A
Application number: CN202010575505.6A
Authority: CN
Inventors: 殷贵超; 石拓; 杨昆
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2022-01-07
Also published as: WO2021258880A1

Abstract

The application provides a light filtering structure, a switching light filtering lens, a switching light filtering sensor, a camera, electronic equipment and a control method of the camera, relates to the technical field of electronic equipment, and can enable the camera to output color images in haze weather. The filter structure can be switched between a first state and a second state, when the filter structure is in the first state, the filter structure allows visible light in the imaging light path to pass through, and when the filter structure is in the second state, the filter structure only allows infrared light in the imaging light path to pass through and prevents other light except the infrared light from passing through. The filtering structure provided by the application is used in an imaging light path of a camera.

Description

Optical filter structure, lens, sensor, camera, electronic apparatus, and control method

Technical Field

The present application relates to the field of electronic devices, and in particular, to a light filtering structure, a switching light filtering lens, a switching light filtering sensor, a camera, an electronic device, and a control method for a camera.

Background

In haze weather, because tiny particles such as fog, smoke and dust in the air have the effect of stopping to light for light reflection can't pass through the camera lens, thereby influences the formation of image of camera. Because of the influence of haze, the contrast of the image that the camera was gathered can be along with the increase of the severity of haze and the trend that sharply falls is presented, can cause some key monitoring target's detail information to be covered by the haze from this, leads to video monitoring system's function to exert and receives the restriction.

In order to obtain an image with clear details in a haze weather, infrared light in the environment can be used for imaging, specifically, an optical fog-transmitting filter can be added in an imaging light path of the camera to filter light except for the infrared light in the imaging light path, such as visible light and ultraviolet light, and only the infrared light enters a light receiving surface of the imaging sensor, so that an infrared light image is obtained. The infrared rays are less affected by the aerosol when being transmitted, and can penetrate through haze with certain concentration to reach an imaging sensor of the camera, so that a clearer image picture can be obtained. However, since infrared light is invisible light, such invisible light has no corresponding visible light color pattern, and thus the current camera with the fog-penetrating function can only present black and white fog-penetrating images.

Disclosure of Invention

The embodiment of the application provides a light filtering structure, a switching light filtering lens, a switching light filtering sensor, a camera, electronic equipment and a control method of the camera, and the camera can output color images in haze weather.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, some embodiments of the present application provide a filter structure for placement in an imaging optical path of a camera, the filter structure being switchable between a first state and a second state, the filter structure allowing visible light in the imaging optical path to pass therethrough when the filter structure is in the first state, and allowing only infrared light in the imaging optical path to pass therethrough when the filter structure is in the second state.

When being applied to the camera with the filtering structure that this application embodiment provided, in haze weather, can make filtering structure switch at a high speed between first state and second state. Since the filtering structure allows visible light in the imaging optical path to pass through when the filtering structure is in the first state, at this time, an image may be captured by the imaging sensor and color frame exposed to obtain a visible light image representing color information. When the filtering structure is in the second state, the filtering structure only allows infrared light in the imaging light path to pass through, so that at the moment, an image can be acquired through the imaging sensor, and black and white frame exposure is carried out on the image, so as to obtain a fog-penetrating image with clear details. Therefore, a visible light image and a detail clear fog penetrating image which represent color information can be respectively obtained at two adjacent time in the front and the back, and after the visible light image and the fog penetrating image are registered and fused, a color fog penetrating image can be output.

Optionally, the filtering structure includes a first filtering portion and a second filtering portion, the first filtering portion allows visible light to pass through, and the second filtering portion allows only infrared light to pass through; the first filtering portion is located in the imaging optical path when the filtering structure is in the first state, and the second filtering portion is located in the imaging optical path when the filtering structure is in the second state. The structure is simple and easy to realize.

Optionally, the first filtering portion also blocks infrared light from passing through. Therefore, the phenomenon that the visible light image collected by the imaging sensor is color cast due to the fact that infrared light enters the imaging sensor along with visible light can be avoided, and the color fog-penetrating image obtained by the camera is color cast. Thereby enabling the camera to output a color fog-through image of true color.

Optionally, the first light filtering portion includes a first light transmissive substrate and a first light filter disposed on the light incident surface or the light emitting surface of the first light transmissive substrate, the first light filter is capable of transmitting visible light, the first light transmissive substrate supports the first light filter, and the first light transmissive substrate is made of optical glass. The structure is simple and easy to realize.

Optionally, the second light filtering portion includes a second light-transmitting substrate and a second light filter film disposed on the light incident surface or the light emitting surface of the second light-transmitting substrate, the second light filter film only allows infrared light to pass through, the second light-transmitting substrate supports the second light filter film, and the second light-transmitting substrate is made of optical glass. The structure is simple and easy to realize.

Optionally, the first transparent substrate and the second transparent substrate are integrally formed. Therefore, the filtering structure is simple in structural composition and convenient to assemble.

Optionally, the filtering structure is a circular filter; the first filtering part is a first sector part on the filtering structure; the second filtering portion is a second fan-shaped portion on the filtering structure. Therefore, the filtering structure is similar to a color wheel in structure, the structure is simple, the implementation is easy, the installation space can be saved, when the filtering structure is applied to a camera, the filtering structure can be eccentrically installed in an imaging light path of the camera, and the rotating driving device is adopted to drive the filtering structure to rotate, so that the filtering structure can be driven to be switched between a first state and a second state.

Optionally, the light filtering structure further comprises a light shielding part for shielding part of light; the light shielding part is a third fan-shaped part on the light filtering structure. In this way, after the filter structure is applied to the camera, in a scene with too strong light, the filter structure can be driven to rotate to the third state by the rotation driving device, so that the shading part is positioned in an imaging light path of the camera, and therefore, part of light is shaded, and overexposure of a collected image is prevented.

Optionally, the light shielding part includes a third light-transmitting substrate and a black semi-transparent light shielding film, and the black semi-transparent light shielding film is disposed on the light incident surface or the light emitting surface of the third light-transmitting substrate. The structure is simple and easy to realize.

Optionally, the filtering structure further comprises a fully light-transmitting portion allowing all light rays to pass through; the total light-transmitting part is a fourth fan-shaped part on the light filtering structure. Like this, after being applied to this filtering structure in the camera, in the less and moderate daytime environment of light of haze, can drive filtering structure rotation to fourth state through rotary driving device to make full light-transmitting part be arranged in the formation of image light path of camera, avoid filtering structure to cause the interference to formation of image light path from this.

Optionally, the fully light-transmitting portion is a clear portion or transparent glass.

Optionally, the light filtering structure is an electrically controllable light absorbing material. The electrically controlled light absorbing material includes, but is not limited to, organic color changing material, liquid crystal material. The electrically controlled light absorbing material can be switched between a first state and a second state by controlling the magnitude of a voltage applied to the electrically controlled light absorbing material, and when the filter structure is in the first state, the electrically controlled light absorbing material allows visible light to pass through, and when the filter structure is in the second state, the electrically controlled light absorbing material only allows infrared light to pass through and absorbs light other than infrared light.

In a second aspect, some embodiments of the present application provide a switching filter lens, which includes a lens barrel, an optical lens set, a filtering structure and a driving device; the lens barrel comprises a first lens barrel section and a second lens barrel section which are arranged along the axial direction of the lens barrel; the optical lens group comprises at least one optical lens, and the optical lens group is arranged in the first lens barrel section; the filtering structure is the filtering structure according to any one of the above technical solutions, and the filtering structure is installed in the second lens barrel section and is located in an imaging light path in the lens barrel; the driving device is connected with the filtering structure and used for driving the filtering structure to switch between a first state and a second state.

The switching filter camera lens that this application embodiment provided, with the filter structure integration in the casing of camera lens, can guarantee the stability of the relative position between filter structure and the optics lens group, guarantee the light path accuracy between filter structure and the optics lens group simultaneously. Meanwhile, since the filtering structure used in the switching filter lens of the embodiment of the present application is the same as the filtering structure described in any of the above technical solutions of the first aspect, the two can solve the same technical problem and achieve the same expected effect.

Optionally, the second barrel section is located on the image side of the first barrel section.

Optionally, the first barrel section includes a first sub-barrel section and a second sub-barrel section, and the first sub-barrel section and the second sub-barrel section are respectively located at two opposite sides of the second barrel section; the optical lens group comprises a plurality of optical lenses, a part of the optical lenses in the plurality of optical lenses are arranged in the first sub-lens barrel section, and the other part of the optical lenses in the plurality of optical lenses are arranged in the second sub-lens barrel section.

Optionally, the second barrel section comprises a barrel section body and a cover; the lens cone section main part is connected with first lens cone section, is equipped with the opening in the lens cone section main part, and the filtering structure can be installed in the lens cone section main part by the opening, and the opening part is located to the lid, and the lid can be dismantled with the lens cone section main part and be connected. In this way, the mounting and dismounting of the filtering structure in the second lens barrel section is facilitated, so that the maintenance or replacement of the filtering structure is facilitated.

In a third aspect, some embodiments of the present application provide a switched filter sensor comprising a sensor housing, an imaging sensor, a filtering structure, and a driving device; the sensor shell is provided with a light inlet; the imaging sensor is arranged in the sensor shell, and a light sensing surface of the imaging sensor is opposite to the light inlet; the light filtering structure is the light filtering structure according to any one of the above technical schemes, and the light filtering structure is installed in the sensor shell and is positioned in an imaging light path between the light inlet and the imaging sensor; the driving device is connected with the filtering structure and used for driving the filtering structure to switch between a first state and a second state.

The switching light filtering sensor provided by the embodiment of the application integrates the light filtering structure and the imaging sensor together, can ensure the stability of the relative position between the light filtering structure and the imaging sensor, and ensures the accuracy of the light path between the light filtering structure and the imaging sensor. Meanwhile, the filter structure and the imaging sensor can be protected from water and dust through the sensor shell. Meanwhile, since the filtering structure used in the switching filtering sensor of the embodiment of the present application is the same as the filtering structure described in any one of the above first aspect, both can solve the same technical problem and achieve the same expected effect.

In a fourth aspect, some embodiments of the present application provide a camera comprising a lens, an imaging sensor, a filtering structure, and a driving device; the imaging sensor is arranged on the image side of the lens; the filtering structure is the filtering structure according to any one of the above technical solutions, the filtering structure is located in an imaging optical path of the camera, and the filtering structure is located at an object-side end of the lens, or located between the lens and the imaging sensor; the driving device is connected with the filtering structure and used for driving the filtering structure to switch between a first state and a second state.

Since the filter structure used in the camera according to the embodiment of the present application is the same as the filter structure described in any of the above first aspects, both can solve the same technical problem and achieve the same intended effect.

In a fifth aspect, the present application provides a camera, comprising a switchable filter lens and an imaging sensor; the switching filter lens is the switching filter lens according to any one of the above second aspect; the imaging sensor is arranged at the image side of the switching filter lens, and the light sensing surface of the imaging sensor is opposite to the image side surface of the switching filter lens.

Since the switching filter lens used in the camera according to the embodiment of the present application is the same as the switching filter lens according to any one of the above second aspects, both can solve the same technical problem and achieve the same intended effect.

In a sixth aspect, some embodiments of the present application provide a camera comprising a lens and a switched filter sensor; the switching filter sensor is the switching filter sensor according to the third aspect, the lens is located outside the sensor housing of the switching filter sensor, the image side end of the lens is connected to the edge of the light inlet of the sensor housing in a circle, and the image side surface of the lens is opposite to the light inlet.

Since the switching filter sensor used in the camera according to the embodiment of the present application is the same as the switching filter sensor according to any one of the above third aspects, both can solve the same technical problem and achieve the same intended effect.

In a seventh aspect, some embodiments of the present application provide an electronic device, which includes the camera according to any one of the fourth, fifth, and sixth aspects.

Since the camera used in the electronic device according to the embodiment of the present application is the same as the camera described in any one of the above fourth, fifth, and sixth aspects, both can solve the same technical problem and achieve the same intended effect.

In an eighth aspect, some embodiments of the present application provide a control method for a camera, the camera including a filter structure disposed in an imaging optical path, the filter structure being switchable between a first state and a second state, the filter structure allowing visible light in the imaging optical path to pass therethrough when the filter structure is in the first state, and allowing only infrared light in the imaging optical path to pass therethrough when the filter structure is in the second state, the control method including: controlling the filtering structure to switch between a first state and a second state; carrying out color frame exposure through an imaging sensor in the imaging light path when the filtering structure is in a first state so as to obtain a visible light image, and carrying out black-and-white frame exposure through the imaging sensor in the imaging light path when the filtering structure is in a second state so as to obtain a fog-penetrating image; and registering and fusing the visible light image and the fog-penetrating image to obtain a color fog-penetrating image.

Thus, in haze weather, the filtering structure can be controlled to be switched between the first state and the second state. Since the filter structure allows visible light in the imaging optical path to pass therethrough when the filter structure is in the first state, at this time, a visible light image representing color information can be obtained. Since the filter structure allows only infrared light in the imaging optical path to pass through when the filter structure is in the second state, at this time, a fog-penetrating image with clear details can be obtained. By registering and fusing the visible light image and the fog-penetrating image, a color fog-penetrating image with clear details can be output.

Drawings

Fig. 1 is a block diagram of a camera according to the present application;

fig. 2 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

FIG. 3 is a schematic diagram of a camera according to some embodiments of the present application;

FIG. 4 is a schematic structural diagram of a filtering structure provided in some embodiments of the present application;

FIG. 5 is a schematic diagram of the camera of FIG. 3 with the filter structure in a second state;

FIG. 6 is a front view of the filtering structure of FIG. 4;

FIG. 7 is a schematic cross-sectional view of the filter structure shown in FIG. 6 along the direction C-C;

FIG. 8 is a schematic structural diagram of a filtering structure according to still other embodiments of the present disclosure;

FIG. 9 is a schematic structural diagram of a filtering structure according to still other embodiments of the present application;

FIG. 10 is a schematic diagram of a filtering structure according to still other embodiments of the present application;

FIG. 11 is a schematic view of a first position of a position detection device in a camera according to some embodiments of the present disclosure;

FIG. 12 is a schematic diagram of a second position of a position detection device in a camera according to some embodiments of the present application;

FIG. 13 is a perspective view of a switchable filter lens according to some embodiments of the present application;

FIG. 14 is an exploded view of the switching filter lens of FIG. 13;

FIG. 15 is a perspective view of a switchable filter lens according to still other embodiments of the present application;

FIG. 16 is an exploded view of the switching filter lens of FIG. 15;

FIG. 17 is a perspective view of a switched filter sensor provided in accordance with some embodiments of the present application;

FIG. 18 is an exploded view of the switched filter sensor of FIG. 17;

FIG. 19 is an assembly view of the switching filter sensor and lens of FIG. 17;

fig. 20 is a flowchart of a control method of a camera according to some embodiments of the present application.

Reference numerals:

1-a mobile phone main body; 11-mounting grooves; 2-a camera; 21-a lens; 211-lens barrel; 2111-first barrel section; 2111 a-first barrel section; 2111 b-second barrel section; 2112-second barrel section; 21121-barrel section body; 21122-first cover; 21123-first light admission port; 21124-second light admission port; 21125-receiving recess; 212-an optical lens; 22-an imaging sensor; 231-a light filtering structure; 232-a rotary drive; 231 a-first filtering portion; 231 b-second filter portion; 231c — light shielding portion; 231 d-full light-transmitting portion; 24-a sensor housing; 241-a main housing; 242 — a second cover; 25-light inlet; 26-position detection means; 27-a controller; 28-shade.

Detailed Description

In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "and/or" is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The present application relates to a camera, an electronic apparatus, and a camera control method, and concepts related to the present application will be briefly described below:

imaging optical path of camera: the light reflected by the shot object is transmitted to the lens from the shot object, is focused by the lens and then is transmitted to the imaging sensor to form the whole light transmission path of an image, and the lens and the imaging sensor are both positioned in the imaging light path of the camera.

An image side: the side close to the image formed in the camera, and the structure for forming an image of a subject in the camera is an imaging sensor, so the image side generally refers to the side close to the imaging sensor.

The image side end refers to an end close to an image formed in the camera, and the structure for forming an image of an object in the camera is an imaging sensor, so the image side end generally refers to an end close to the imaging sensor.

The method comprises the following steps: refers to the side of the scene that is close to the camera's coverage, i.e. the side that faces away from the imaging sensor.

The object side end refers to the end close to the scene in the coverage area of the camera, i.e. the end facing away from the imaging sensor.

The mover of the driving device is a portion of the driving device that moves together with an object when the driving device drives the object to move. The stator of the driving device corresponds to the stator of the driving device, and the stator of the driving device refers to a part of the driving device which is relatively static with a structure for fixedly supporting the driving device when the driving device drives an object to move.

In order to obtain a color image in haze weather, fig. 1 is a block diagram of a camera according to an example. As shown in fig. 1, the camera includes two camera modules arranged side by side, each camera module including a lens and a sensor. One camera module is used for collecting a visible light image which represents color information of the image, and the other camera module is used for collecting a fog-penetrating image which is only formed by infrared light and can represent detail information of the image. The visible light images and the fog-penetrating images collected by the two camera modules can be registered and fused after being subjected to noise reduction and other image processing respectively to generate colorful fog-penetrating images. However, the positions of the two camera modules cannot be completely overlapped, and the acquisition fields of the two camera modules are not consistent, so that the visible light image and the fog-penetrating image cannot be completely registered, and the color information and the detail characteristics cannot be completely matched, so that a high-quality color fog-penetrating image cannot be obtained.

In order to obtain a high-quality color fog-penetrating image, the application provides an electronic device which comprises but is not limited to a mobile phone terminal, a vehicle-mounted terminal, a monitor and a smart wearable device. The electronic device includes a camera for outputting a color image in haze weather.

Fig. 2 is a schematic structural diagram of an electronic device according to some embodiments of the present application, where the electronic device is a mobile phone. As shown in fig. 2, the mobile phone includes a mobile phone body 1 and a camera 2. The mobile phone comprises a mobile phone body 1 and a camera 2, wherein the mobile phone body 1 is provided with a mounting groove 11, the camera 2 is mounted in the mounting groove 11, the orientation of a lens of the camera 2 is consistent with the orientation of an opening of the mounting groove 11, and an imaging sensor of the camera 2 is electrically connected with a main control panel in the mobile phone body 1 so as to control the imaging sensor to acquire images and perform image processing on the acquired images. The camera 2 may be a front camera on a mobile phone, or may be a rear camera on the mobile phone, which is not limited herein.

The application also provides a camera, which is the camera in the electronic equipment and is used for outputting the color image in the haze weather.

Fig. 3 is a schematic structural diagram of a camera provided in some embodiments of the present application, where the camera is the camera 2 in the electronic device shown in fig. 2. As shown in fig. 3, the camera 2 includes a lens 21 and an imaging sensor 22. The lens 21 and the imaging sensor 22 are located in an imaging optical path of the camera 2, the lens 21 is used for focusing light reflected by a shot object, the imaging sensor 22 is located on the image side of the lens 21, and the imaging sensor 22 is used for imaging the light focused by the lens 21.

As shown in fig. 3, the camera 2 further comprises a filter structure 231, which filter structure 231 is switchable between a first state and a second state. When the filtering structure 231 is in the first state, the filtering structure 231 allows visible light in the imaging light path to pass through. When the filtering structure 231 is in the second state, the filtering structure 231 allows only infrared light in the imaging light path to pass through.

It can be appreciated that the filtering structure 231 only allows infrared light in the imaging light path to pass through, which means: the filter structure 231 allows the infrared light in the imaging light path to pass through and prevents other light (such as visible light, ultraviolet light) except for the infrared light from passing through, or allows only a small amount of other light to pass through, the transmittance of the other light being much smaller than that of the infrared light and being substantially negligible.

In this way, in haze weather, the filter structure 231 can be switched at high speed between the first state and the second state. Since the filtering structure 231 allows visible light in the imaging light path to pass through when the filtering structure 231 is in the first state, at this time, an image may be captured by the imaging sensor 22 and color frame exposed to obtain a visible light image representing color information. Since the filter structure 231 only allows the infrared light in the imaging light path to pass through when the filter structure 231 is in the second state, at this time, an image can be captured by the imaging sensor 22 and subjected to black and white frame exposure to obtain a fog-penetrating image with clear details. Therefore, the camera provided by the embodiment of the application adopts one lens 21 and one imaging sensor 22 to form one imaging optical path, the filtering structure 231 is arranged in the imaging optical path, the visible light image representing color information and the fog-penetrating image with clear details can be respectively obtained at two adjacent front and back times by switching the filtering structure 231 between the first state and the second state, and as the visible light generating the visible light image and the infrared light generating the fog-penetrating image are transmitted along the imaging optical path formed by the lens 21 and the imaging sensor 22, the collection visual field of the visible light image and the collection visual field of the fog-penetrating image can be ensured to be consistent on the premise that the position of the camera is not moved, so that the visible light image and the fog-penetrating image can be registered and fused to output a high-quality color fog-penetrating image.

In the above embodiment, the specific structure of the filtering structure 231 is not limited as long as the filtering structure 231 can be switched between the first state and the second state, and the filtering structure 231 can allow visible light in the imaging optical path to pass through in the first state and can only allow infrared light in the imaging optical path to pass through in the second state. As an example, the specific structure of the filtering structure 231 may include the following two alternative implementations:

a first alternative implementation: the light filtering structure 231 is an electrically controlled light absorbing material, which includes, but is not limited to, an organic color-changing material, a liquid crystal material. By controlling the magnitude of the voltage applied to the electrically controllable light absorbing material, the light filtering structure 231 can be switched between the first state and the second state, and when the light filtering structure 231 is in the first state, the electrically controllable light absorbing material allows visible light to pass through, and when the light filtering structure 231 is in the second state, the electrically controllable light absorbing material only allows infrared light to pass through and absorbs other light besides infrared light.

A second alternative implementation: fig. 4 is a schematic structural diagram of a filtering structure provided in some embodiments of the present application, where the filtering structure is the filtering structure 231 in the camera shown in fig. 3. As shown in fig. 4, the filtering structure 231 includes a first filtering portion 231a and a second filtering portion 231b, the first filtering portion 231a allowing visible light to pass therethrough, and the second filtering portion 231b allowing only infrared light to pass therethrough. Fig. 3 shows the filter structure in the camera in the first state, and as shown in fig. 3, when the filter structure 231 is in the first state, the first filter portion 231a is located in the imaging optical path, and at this time, the visible light in the imaging optical path is transmitted through the filter structure 231 and enters the imaging sensor 22, and the imaging sensor 22 obtains a visible light image representing color information. Fig. 5 is a schematic diagram of the camera of fig. 3 with the filter structure in a second state. As shown in fig. 5, when the filter structure 231 is in the second state, the second filter portion 231b is located in the imaging light path, and at this time, only infrared light or a small amount of other light in the imaging light path is transmitted through the filter structure 231 and enters the imaging sensor 22, and the imaging sensor 22 can obtain a fog-penetrating image with clear details. The structure is simple and easy to realize.

As shown in fig. 4, the first filtering portion 231a may allow visible light to pass through, and at the same time, may also allow light of other wavelengths to pass through, for example, the first filtering portion 231a is made of transparent optical glass, and for example, the first filtering portion 231a is a vacant portion, and at this time, the first filtering portion 231a may allow light of all wavelengths including visible light to pass through. Of course, the first filtering portion 231a may allow visible light to pass through but prevent other light (such as infrared light) or lights from passing through, in this case, the structure of the first filtering portion 231a may be composed of a light-transmitting substrate (such as glass) and light absorbing/reflecting particles doped in the light-transmitting substrate, the light absorbing/reflecting particles may absorb or reflect other light(s) other than visible light, and the structure of the first filtering portion 231a may also be composed of a light-transmitting substrate (such as optical glass, common glass, acrylic, and the like) and a filter film disposed on a surface of the light-transmitting substrate, the filter film may absorb or reflect other light(s) other than visible light and transmit visible light, which is not particularly limited herein. The first filter portion 231a may be a band pass filter, a cut filter, or a reflective filter, and is not particularly limited as long as the first filter portion 231a allows visible light to pass through. Specifically, the structure of the first filter portion 231a may also be designed according to the national standard GB-T15488-2010-filter glass.

In some embodiments, fig. 6 is a front view of the filter structure shown in fig. 4, and fig. 7 is a schematic cross-sectional view of the filter structure shown in fig. 6 along the direction C-C. As shown in fig. 7, the first filtering portion 231a includes a first transparent substrate a and a first filter film b disposed on a surface of the first transparent substrate a, the first filter film b can transmit visible light, the first transparent substrate a supports the first filter film b, and the first transparent substrate a is made of optical glass. The structure is simple and easy to realize.

The first filter film b may be disposed on the light incident surface and/or the light emitting surface of the first light-transmitting substrate a, which is not limited herein. Fig. 7 only shows an example in which the first filter film b is disposed on the light incident surface of the first light-transmitting substrate a, and is not to be considered as a limitation to the present disclosure.

The first filter film b may be directly formed on the surface of the first light-transmitting substrate a by spraying, depositing, or the like, or may be adhered to the surface of the first light-transmitting substrate a by gluing, which is not limited herein.

Optionally, the first filter film b is adhered to the surface of the first light-transmitting substrate a by using glue. Thus, when the first filter portion 231a is repaired and replaced, only the first filter film b needs to be replaced, so that the operation is convenient and the cost is low.

The first filtering portion 231a may further include an anti-reflection film disposed on the light incident surface or the light emitting surface of the first transparent substrate a, in addition to the first transparent substrate a and the first filter film b, and the anti-reflection film may increase the transmittance of visible light.

In some embodiments, the first filtering portion 231a prevents infrared light from passing while allowing visible light to pass. In this way, it is possible to avoid the visible light image collected by the imaging sensor 22 from being color-shifted due to the infrared light entering the imaging sensor 22 along with the visible light, so that the camera can output a color fog-penetrating image with a true color.

In addition, as shown in fig. 4, the second filtering portion 231b may have a structure formed of a light-transmitting substrate (e.g., optical glass, common glass, acryl, etc.) and light absorbing/reflecting particles doped in the light-transmitting substrate, the light absorbing/reflecting particles being capable of absorbing or reflecting light other than infrared light and allowing the infrared light to pass through. The structure of the second filtering portion 231b may also be composed of a light-transmitting substrate (such as optical glass, common glass, acrylic, etc.) and a filter film disposed on a surface of the light-transmitting substrate, where the filter film may absorb or reflect light other than infrared light and transmit infrared light, and is not limited in this respect. The second filter portion 231b may be a band pass filter, a cut filter, or a reflective filter, and is not particularly limited as long as the second filter portion 231b allows only infrared light in the imaging light path to pass therethrough. Specifically, the structure of the second filter portion 231b may also be designed according to the national standard GB-T15488-2010-filter glass.

In some embodiments, as shown in fig. 7, the second filtering portion 231b includes a second transparent substrate c and a second filter d disposed on a surface of the second transparent substrate c, the second filter d only allows infrared light to pass through, the second transparent substrate c supports the second filter d, and the second transparent substrate c is made of optical glass. The structure is simple and easy to realize.

The second filter film d may be disposed on the light incident surface and/or the light emitting surface of the second light-transmitting substrate c, which is not limited herein. Fig. 7 only shows an example that the second filter d is disposed on the light incident surface of the second light-transmitting substrate c, and is not to be considered as a limitation to the present disclosure.

The second filter film d may be directly formed on the surface of the second light-transmitting substrate c by spraying, depositing, or the like, or may be adhered to the surface of the second light-transmitting substrate c by gluing, which is not limited herein.

Optionally, the second filter film d is adhered to the surface of the second light-transmitting substrate c. Thus, when the second filter portion 231b is repaired and replaced, only the second filter film d needs to be replaced, so that the operation is convenient and the cost is low.

The second filtering portion 231b may further include an anti-reflection film disposed on the light incident surface or the light emitting surface of the second transparent substrate c, in addition to the second transparent substrate c and the second filter film d, and the anti-reflection film may increase the transmittance of infrared light.

In some embodiments, as shown in fig. 7, the first transparent substrate a and the second transparent substrate c are integrally molded. Thus, the filtering structure 231 has a simple structure and is convenient to assemble.

The arrangement of the first filtering portion 231a and the second filtering portion 231b on the filtering structure 231 may be arranged along a straight line or a circular line, which is not limited herein. Fig. 4 only shows the way in which the first filtering portion 231a and the second filtering portion 231b are arranged along a circular line on the filtering structure 231, and is not considered to be a limitation to the present disclosure.

Specifically, as shown in fig. 4, the filtering structure 231 is a circular filter, the first filtering portion 231a is a first fan-shaped portion on the filtering structure 231, and the second filtering portion 231b is a second fan-shaped portion on the filtering structure 231, and the first fan-shaped portion and the second fan-shaped portion are arranged along the circumferential direction of the filtering structure 231, that is, along a circular line. In this way, the filtering structure 231 is similar to a color wheel, which is simple in structure, easy to implement, and capable of saving installation space, when the filtering structure 231 is applied in a camera, the filtering structure 231 may be eccentrically installed in an imaging light path of the camera 2 (as shown in fig. 3), and the rotation driving device 232 is adopted to drive the filtering structure 231 to rotate, so as to drive the filtering structure 231 to switch between the first state and the second state. The rotation driving device 232 may be a rotating motor.

In other embodiments, fig. 8 is a schematic structural diagram of a filtering structure according to still other embodiments of the present application. As shown in fig. 8, the filtering structure 231 is a rectangular filter, and the first filtering portion 231a and the second filtering portion 231b are two rectangular portions arranged along a length direction of the rectangular filter, respectively. At this time, the first and

second filter portions

231a and 231b are arranged along a straight line. When the filter structure 231 is applied to a camera, the length direction of the rectangular filter can be perpendicular to the imaging light path of the camera 2, and the linear driving device is adopted to drive the filter structure 231 to reciprocate along the length direction of the filter structure 231, so that the filter structure 231 can be driven to switch between the first state and the second state. Wherein the linear driving device may be a linear motor.

In order to drive the filtering structure 231 to switch between the first state and the second state, the camera 2 further comprises driving means. The driving device is connected to the filtering structure 231, and the driving device is configured to drive the filtering structure 231 to switch between a first state and a second state.

In the above embodiments, the driving device has a plurality of structural forms, and the driving device can be specifically designed according to the structural form of the filtering structure 231. For example, when the light filtering structure 231 is an electrically controlled light absorbing material, the driving device can be designed as a circuit connected to the electrically controlled light absorbing material; when the filtering structure 231 is a structure similar to the color wheel shown in fig. 4, the driving device may be designed as the rotation driving device 232 shown in fig. 3; when the filter structure 231 is a rectangular filter as shown in fig. 8, the driving device may be designed as a linear driving device, and is not particularly limited herein.

In order to make the camera 2 capable of being used in a scene with too strong light besides haze weather, fig. 9 is a schematic structural diagram of the filter structure provided in some embodiments of the present application, as shown in fig. 9, the filter structure 231 further includes a light shielding portion 231c, the light shielding portion 231c is used for shielding part of light, the light that can be shielded by the light shielding portion 231c includes visible light and invisible light of all colors, and the light shielding portion 231c is a third fan-shaped portion on the filter structure 231. In this way, after the filter structure 231 is applied to the camera 2 shown in fig. 3, in a scene with too strong light, the filter structure 231 may be driven by the rotation driving device 232 to rotate to the third state, so that the light shielding portion 231c is located in the imaging optical path of the camera, thereby shielding part of the light to prevent the captured image from being overexposed.

In the above embodiments, the light shielding portion 231c may be composed of a light-transmitting substrate (such as glass) and black light-absorbing particles doped in the light-transmitting substrate, or may be composed of a light-transmitting substrate and a black semi-transparent light-shielding film disposed on a surface of the light-transmitting substrate, and is not limited herein.

In some embodiments, the light shielding portion 231c includes a third light-transmitting substrate and a black translucent light-shielding film disposed on a surface of the third light-transmitting substrate. The structure is simple and easy to realize.

The black semitransparent light shielding film may be disposed on the light incident surface and/or the light emitting surface of the third transparent substrate, which is not limited herein. The black semitransparent light shielding film may be directly formed on the surface of the third transparent substrate by spraying, deposition, or the like, or may be adhered to the surface of the third transparent substrate by gluing, which is not limited herein.

Optionally, the black semi-transparent light-shielding film is adhered to a surface of the third light-transmitting substrate. In this way, when the light shielding portion 231c is repaired and replaced, only the black translucent light shielding film needs to be removed, so that the operation is convenient and the cost is low.

In some embodiments, the first transparent substrate a, the second transparent substrate c, and the third transparent substrate are integrally formed. Thus, the filtering structure 231 has a simple structure and is convenient to install.

According to the above description, the camera 2 equipped with the light filtering structure 231 shown in fig. 9 can work in two scenes, namely, in the haze weather and the too strong light scene, when the camera 2 works in the haze weather scene, the camera 2 is in the first working mode, and in the first working mode, the rotary driving device 232 drives the light filtering structure 231 to switch between the first state and the second state, so as to collect the colorful fog-penetrating image in the haze weather. When the camera 2 operates in a scene with too strong light, the camera 2 drives the filter structure 231 to rotate to the third state through the rotation driving device 232 to switch to the second operation mode, in which the light shielding portion 231c is located in the imaging light path, and the light shielding portion 231c can shield part of the light to prevent the captured image from being over exposed.

In order to enable the camera 2 to be used in a daytime environment with less haze and moderate light besides haze weather, in some embodiments, fig. 10 is a schematic structural diagram of a filter structure provided in some further embodiments of the present disclosure, as shown in fig. 10, the filter structure 231 further includes a full light-transmitting portion 231d, the full light-transmitting portion 231d allows all light to pass through, the full light-transmitting portion 231d may be a notch or a transparent glass, and fig. 10 only shows an embodiment in which the full light-transmitting portion 231d is a notch, and is not to be considered as a limitation to the present disclosure. The fully light transmitting portion 231d is a fourth sector portion on the filter structure 231. In this way, after the filter structure 231 is applied to the camera 2 shown in fig. 3, in a daytime environment with less haze and moderate light, the filter structure 231 may be driven to rotate to the fourth state by the rotation driving device 232, so that the full light-transmitting portion 231d is located in the imaging light path of the camera, thereby preventing the filter structure 231 from interfering with the imaging light path.

When the filter structure 231 is the structure shown in fig. 10, the camera 2 can operate in the first operating mode and the second operating mode, and can also drive the filter structure 231 to rotate to the fourth state through the rotation driving device 232 in an environment with less haze and moderate light to switch to the third operating mode, and in the third operating mode, the full light-transmitting portion 231d is located in the imaging light path of the camera, so that the filter structure 231 is prevented from interfering with the imaging light path.

To enable automatic switching of the camera 2, including the filtering structure shown in fig. 10, between the first, second and third modes of operation, in some embodiments the camera further includes a controller to which the imaging sensor 22 and the rotary drive 232 are electrically connected. The controller can control the rotation driving device 232 to switch to the first working mode, the second working mode or the third working mode according to the intensity of the ambient light detected by the imaging sensor 22. In this way, an automatic switching between the different operating modes of the camera 2 can be achieved.

It should be understood that the filtering structure 231 may further include other filtering portions, such as a white light sheet, a polarizing plate, and the like, so that the filtering structure 231 can operate in other operation modes, which is not limited herein.

In the first operating mode of the camera 2, the driving device drives the filtering structure 231 to switch between the first state and the second state. Specifically, the driving device may drive the filtering structure 231 to switch between the first state and the second state once, during the switching, the imaging sensor may collect an image and perform a color frame exposure and a black and white frame exposure to obtain a frame of visible light image and a frame of fog-penetrating image, and after the visible light image and the fog-penetrating image are registered and fused, a color fog-penetrating image may be output, so that a "taking picture" function of the camera may be implemented. The driving device can also drive the filtering structure 231 to perform high-speed cyclic switching between the first state and the second state, in the high-speed cyclic switching process, the imaging sensor 22 can acquire images and alternately perform color frame exposure and black and white frame exposure along with time to alternately acquire visible light image frames and fog-penetrating image frames along with time, and the front and rear adjacent visible light images and fog-penetrating images are registered and fused into one color fog-penetrating image frame, so that a plurality of color fog-penetrating images can be sequentially output along with time, and the video recording function of the camera can be realized.

The filtering structure 231 may be located between the lens 21 and the imaging sensor 22, between a plurality of optical lenses in the lens 21, or on the object side of the lens 21, which is not limited herein. Fig. 3 shows only one example of the filter structure 231 located between the lens 21 and the imaging sensor 22, and should not be construed as limiting the present application. The filtering structure 231 may be integrated in the housing of the lens 21, or integrated in the housing of the imaging sensor 22, or may be disposed in a separate housing to form an independent switching filtering module, and the switching filtering module is connected to the object side end of the lens 21, or connected between the image side end of the lens 21 and the imaging sensor 22. For example, the arrangement position and the connection mode of the filtering structure 231 may include the following two embodiments:

the first embodiment is as follows: fig. 13 is a perspective view of a switching filter lens according to some embodiments of the present application, and fig. 14 is an exploded view of the switching filter lens shown in fig. 13. As shown in fig. 13 and 14, the lens 21 includes a lens barrel 211 and an optical lens group, the material of the lens barrel 211 includes, but is not limited to, metal and plastic, and the optical lens group includes at least one optical lens 212. The barrel 211 includes a first barrel section 2111 and a second barrel section 2112 arranged axially along itself. The maximum width of the cross section of the second barrel section 2112 is greater than the maximum width of the cross section of the first barrel section 2111, and the second barrel section 2112 is connected to the first barrel section 2111. The optical lens group is installed in the first barrel section 2111, and the filtering structure 231 is installed in the second barrel section 2112. Thus, the filtering structure 231 is integrated in the housing of the lens 21 to form a switching filtering lens, so that the stability of the relative position between the filtering structure 231 and the optical lens group can be ensured, and the accuracy of the optical path between the filtering structure 231 and the optical lens group can be ensured. The cross section of the second barrel section 2112 and the cross section of the first barrel section 2111 both refer to a plane perpendicular to the axial direction of the barrel 211.

In the above embodiment, the second barrel section 2112 may be located on the image side of the first barrel section 2111, or located in the middle of the first barrel section 2111 along the axial direction, or located on the object side of the first barrel section 2111, which is not limited herein. Fig. 13 and 14 only show examples in which the second barrel section 2112 is located on the image side of the first barrel section 2111, and the present application is not considered to be limited thereto.

Fig. 15 is a perspective view of a switching filter lens according to still other embodiments of the present application, and fig. 16 is an exploded view of the switching filter lens shown in fig. 15. As shown in fig. 15 and 16, the first barrel section 2111 includes a first sub-barrel section 2111a and a second sub-barrel section 2111 b. First and second

sub-barrel sections

2111a and 2111b are located on opposite sides of second barrel section 2112, respectively. The optical lens group includes a plurality of optical lenses 212, a portion of the plurality of optical lenses 212 being mounted in a first sub-cylinder section 2111a, and another portion of the plurality of optical lenses 212 being mounted in a second sub-cylinder section 2111 b. Thus, the second barrel section 2112 is disposed at the middle of the first barrel section 2111 in the axial direction, with the filter structure 231 located between the plurality of optical lenses in the lens 21. The structure is simple and easy to realize.

In the video camera shown in fig. 14 or 16, a portion of the second barrel section 2112 on the imaging optical path is provided with a first light passage port 21123 and a second light passage port 21124 (not shown in the video camera shown in fig. 16). Thereby avoiding obstruction of the imaging optical path.

In the camera shown in fig. 14 or 16, the imaging sensor is connected to the image-side end surface of the switching filter lens, and the light-sensing surface of the imaging sensor is opposite to the light-exit port on the image-side end surface of the switching filter lens. Specifically, the connection relationship between the imaging sensor and the switching filter lens may be: the imaging sensor is directly bonded to the image side end face of the switching filter lens through foam adhesive, or the imaging sensor is packaged in an independent shell and is connected with the image side end of the switching filter lens through a clamping structure or a threaded connection structure arranged on the shell, and no specific limitation is made here.

In some embodiments, as shown in fig. 14 or 16, the inner wall of the second barrel section 2112 is provided with a receiving groove 21125, and at least part of the driving device is received in the receiving groove 21125. In this way, at least a portion of the driving device is embedded in the wall plate of the second barrel section 2112, and the driving device is prevented from occupying the internal space of the second barrel section 2112, thereby being beneficial to reducing the volume of the second barrel section 2112.

In some embodiments, as shown in fig. 14 or 16, second barrel section 2112 includes a barrel section body 21121 and a first cover 21122. The barrel section main body 21121 is connected to the first barrel section 2111, an opening 21123 is provided on the barrel section main body 21121, the filtering structure 231 can be installed in the barrel section main body 21121 through the opening 21123, the first cover 21122 is covered at the opening 21123, and the first cover 21122 is detachably connected to the barrel section main body 21121. In this way, mounting and dismounting of the filtering structure 231 within the second barrel section 2112 is facilitated to facilitate maintenance or replacement of the filtering structure 231.

Example two: fig. 17 is a perspective view of a switching filter sensor according to some embodiments of the present disclosure, and as shown in fig. 17, the camera 2 further includes a sensor housing 24, and the sensor housing 24 may be made of plastic. Fig. 18 is an exploded view of the switched filter sensor of fig. 17, with the imaging sensor 22 disposed within the sensor housing 24, as shown in fig. 18. Fig. 19 is an assembly view of the switching filter sensor and the lens shown in fig. 17, and as shown in fig. 19, the lens 21 is disposed outside the sensor housing 24. The sensor housing 24 is provided with a light inlet 25, a light sensing surface of the imaging sensor 22 is opposite to the light inlet 25, an image side of the lens 21 is connected with a periphery of the edge of the sensor housing 24 at the light inlet 25, and an image side of the lens 21 is opposite to the light inlet 25. The filtering structure 231 is mounted in the sensor housing 24 and is located in the imaging optical path between the light inlet 25 and the imaging sensor 22. In this way, the filtering structure 231 is integrated with the imaging sensor 22 to form a switching filtering sensor, so that the stability of the relative position between the filtering structure 231 and the imaging sensor 22 can be ensured, and the accuracy of the optical path between the filtering structure 231 and the imaging sensor 22 can be ensured. Meanwhile, the filter structure 231 and the imaging sensor 22 can be protected from water and dust by the sensor housing 24.

In some embodiments, the image side end of the lens 21 and the edge of the sensor housing 24 at the light inlet 25 may be connected through a C interface, a CS interface, or an F interface. In this way, the integrated structure of the filtering structure 231 and the imaging sensor 22 can be matched and connected with the existing lens, so that the lens does not need to be redesigned, and the manufacturing cost of the camera is saved.

To facilitate the installation and removal of the filter structure 231 in the sensor housing 24, in some embodiments, as shown in fig. 18, the sensor housing 24 includes a main housing 241 and a second cover 242, an opening 243 is provided at one end of the main housing 241, the imaging sensor 22 and the filter structure 231 can be installed in the main housing 241 through the opening 243, and the second cover 242 is covered at the opening 243 and detachably connected to the main housing 241. In this manner, installation and removal of the filtering structure 231 within the sensor housing 24 is facilitated to facilitate replacement or maintenance of the filtering structure 231.

The present application further provides a control method of a camera for controlling the camera according to any one of the above embodiments, the camera includes a filter structure 231 disposed in the imaging optical path, the filter structure 231 is switchable between a first state and a second state, when the filter structure 231 is in the first state, the filter structure 231 allows visible light in the imaging optical path to pass through, and when the filter structure 231 is in the second state, the filter structure 231 only allows infrared light in the imaging optical path to pass through. Fig. 20 is a flowchart of a control method of a camera according to some embodiments of the present application, and as shown in fig. 20, the control method includes:

s100: controlling the filtering structure 231 to switch between a first state and a second state;

s200: performing color frame exposure through the imaging sensor 22 in the imaging optical path when the filtering structure 231 is in the first state to obtain a visible light image, and performing black and white frame exposure through the imaging sensor 22 in the imaging optical path when the filtering structure 231 is in the second state to obtain a fog-penetrating image;

s300: and registering and fusing the visible light image and the fog-penetrating image to obtain a color fog-penetrating image.

In this way, in haze weather, the filter structure 231 may be controlled to switch between the first state and the second state. Since the filter structure 231 allows visible light in the imaging optical path to pass therethrough when the filter structure 231 is in the first state, at this time, a visible light image representing color information can be obtained. Since the filter structure 231 allows only infrared light in the imaging light path to pass through when the filter structure 231 is in the second state, at this time, a fog-penetrating image with clear details can be obtained. By registering and fusing the visible light image and the fog-penetrating image, a color fog-penetrating image with clear details can be output.

In the above embodiment, the imaging sensor 22 determines the time of color frame exposure and the time of black and white frame exposure according to the state of the filtering structure 231, specifically, when the filtering structure 231 is in the first state, the imaging sensor 22 acquires an image and performs color frame exposure on the image to obtain a visible light image; when the filter structure 231 is in the second state, the imaging sensor 22 acquires an image and performs black and white frame exposure on the image to obtain a fog-penetrating image. And registering and fusing the visible light image and the fog-penetrating image to obtain a colorful fog-penetrating image. In order to determine the time of the color frame exposure and the time of the black and white frame exposure of the imaging sensor 22, it is necessary to know the state of the filtering structure 231.

When the light filtering structure 231 is made of an electrically controlled light absorbing material, the controller can synchronously control the light filtering structure 231 to switch states and the imaging sensor 22 to perform color frame exposure or black and white frame exposure, and the control process is simple and will not be described herein.

When the filtering structure 231 includes the first filtering portion 231a and the second filtering portion 231b, the filtering structure 231 needs to move to switch between the first state and the second state. At this time, in order to determine the time of the color frame exposure and the time of the black and white frame exposure of the imaging sensor 22, the motion position of the filtering structure 231 needs to be known. In order to acquire the motion position of the filtering structure 231 and determine the time of color frame exposure and the time of black and white frame exposure of the imaging sensor 22 according to the motion position of the filtering structure 231, in some embodiments, as shown in fig. 11, the camera 2 further includes a position detection device 26 and a controller 27.

The position detection device 26 is used for detecting the movement position of the filter structure 231. The position detecting device 26 may be an optoelectronic position sensor, a hall position sensor, or the like, and is not particularly limited herein. The controller 27 is connected to both the position detecting device 26 and the imaging sensor 22, and the controller 27 is configured to determine the color frame exposure time and the black-and-white frame exposure time according to the detection result of the position detecting device 26, and control the imaging sensor 22 to perform color frame exposure at the color frame exposure time and perform black-and-white frame exposure at the black-and-white frame exposure time, so as to implement automatic control of color frame exposure and black-and-white frame exposure.

In some embodiments, as shown in FIG. 11, the position sensing device 26 is a photo-coupler, which is one of the photo-electric position sensors. The photoelectric coupler comprises a light emitting source and a light receiving device which are not interfered with each other, wherein optionally, the light emitting source is a light emitting diode, and the light receiving device is a photosensitive diode, a phototriode and the like. When the device works, the light emitting source emits light to irradiate a measured object, the light can be received by the light receiver after being reflected by the measured object, and the light receiver converts the received light into an electric signal to be output.

When the photoelectric coupler is used for detecting the movement position of the filtering structure 231, the photoelectric coupler and the imaging sensor 22 are relatively fixed, the light emitting source of the photoelectric coupler continuously emits light to the rotor of the driving device, the rotor can reflect the light, and the light receiver of the photoelectric coupler continuously receives the light. A certain position of the mover of the driving device 232 is provided with a shielding object 28, the shielding object 28 can move along with the mover, and the reflectivity of the shielding object 28 to the light emitted by the light emitting source is different from the reflectivity of the mover to the light emitted by the light emitting source. When the mover moves to the first predetermined position, the shielding object 28 moves to a position opposite to the light emitting surface of the light emitting source, and at this time, the intensity of the light signal received by the light receiver changes, so that the current position of the filtering structure 231 can be obtained and recorded as the initial position. The controller 27 can determine the time when the filter structure 231 moves to the first state, that is, the time of color frame exposure, according to the start position, the relative position between the shutter 28 and the first filter portion 231a, and the motion track and the motion speed of the mover, and thus can determine the time of color frame exposure. Likewise, the controller 27 can determine the time when the filter structure 231 is in the second state according to the start position, the relative position between the shutter 28 and the second filter portion 231b, and the motion track and the motion speed of the mover of the driving device 232, and the time when the filter structure 231 is in the second state is also the time of the black-and-white frame exposure, thereby being capable of determining the time of the black-and-white frame exposure. The color of the shade 28 may be black, white, etc., and is not limited in particular. It is sufficient that the reflectivity of the shielding 28 for the light emitted by the light emitting source is different from the reflectivity of the mover for the light emitted by the light emitting source.

In some embodiments, as shown in fig. 12, the light emitting source of the photocoupler can also continuously emit light to the filtering structure 231, the light receiving device of the photocoupler continuously receives light, a certain position of the filtering structure 231 is provided with a shielding object 28, the shielding object 28 can move along with the filtering structure 231, and the reflectivity of the shielding object 28 to the light emitted by the light emitting source is different from the reflectivity of the filtering structure 231 to the light emitted by the light emitting source. When the filtering structure 231 moves to the first predetermined position, the blocking object 28 moves to a position opposite to the light emitting surface of the light emitting source, and at this time, the intensity of the light signal received by the light receiver changes, so that the current position of the filtering structure 231 can be obtained and recorded as the initial position. The color of the shade 28 may be black, white, etc., and is not limited in particular. The reflectivity of the shielding object 28 for the light emitted from the light emitting source may be different from the reflectivity of the filtering structure 231 for the light emitted from the light emitting source.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A filter structure for placement in an imaging optical path of a camera, the filter structure being switchable between a first state and a second state, the filter structure allowing visible light in the imaging optical path to pass therethrough when the filter structure is in the first state, and allowing only infrared light in the imaging optical path to pass therethrough when the filter structure is in the second state.

2. The light filtering structure according to claim 1, wherein the light filtering structure comprises a first light filtering portion and a second light filtering portion, the first light filtering portion allowing visible light to pass therethrough, the second light filtering portion allowing only infrared light to pass therethrough;

when the filtering structure is in the first state, the first filtering portion is located in the imaging optical path, and when the filtering structure is in the second state, the second filtering portion is located in the imaging optical path.

3. The filter structure of claim 2, wherein the first filter portion also blocks infrared light from passing therethrough.

4. A filter structure according to claim 2 or 3, wherein the filter structure is a circular filter;

the first filtering part is a first fan-shaped part on the filtering structure;

the second filtering portion is a second sector portion on the filtering structure.

5. The light filtering structure of claim 4, wherein the first light filtering portion comprises a first light transmissive substrate and a first filter, the first filter is disposed on a light incident surface or a light emitting surface of the first light transmissive substrate, and the first filter allows visible light to pass through.

6. The light filtering structure of claim 5, wherein the second light filtering portion comprises a second light transmissive substrate and a second light filtering film, the second light filtering film is disposed on a light incident surface or a light emitting surface of the second light transmissive substrate, and the second light filtering film only allows infrared light to pass through.

7. The light filtering structure of claim 6, wherein the first light-transmissive substrate is integrally formed with the second light-transmissive substrate.

8. The light filtering structure according to any one of claims 4 to 7, further comprising a light shielding portion for shielding a portion of light;

the light shielding part is a third fan-shaped part on the light filtering structure.

9. The light filtering structure of claim 8, wherein the light shielding part comprises a third light transmissive substrate and a black semi-transparent light shielding film, and the black semi-transparent light shielding film is disposed on a light incident surface or a light emergent surface of the third light transmissive substrate.

10. The filtering structure according to any one of claims 4 to 9, wherein said filtering structure further comprises a fully light-transmitting portion, said fully light-transmitting portion allowing all light rays to pass therethrough;

the full light-transmitting part is a fourth fan-shaped part on the light filtering structure.

11. The light filtering structure of claim 10, wherein said all-light-transmitting portion is transparent glass.

12. A switching filter lens, comprising:

the lens barrel comprises a first lens barrel section and a second lens barrel section which are arranged along the axial direction of the lens barrel;

an optical lens group comprising at least one optical lens, the optical lens group being mounted within the first barrel section;

the light filtering structure according to any one of claims 1 to 11, wherein the light filtering structure is mounted in the second lens barrel section and is located in an imaging light path in the lens barrel;

and the driving device is connected with the filtering structure and used for driving the filtering structure to be switched between a first state and a second state.

13. The switchable filter lens of claim 12, wherein the second barrel section is located image-wise of the first barrel section.

14. The switching filter lens of claim 12, wherein the first barrel section includes a first sub-barrel section and a second sub-barrel section, the first sub-barrel section and the second sub-barrel section being located on opposite sides of the second barrel section, respectively;

the optical lens set comprises a plurality of optical lenses, a part of the number of optical lenses in the plurality of optical lenses is mounted in the first sub-cylinder section, and another part of the number of optical lenses in the plurality of optical lenses is mounted in the second sub-cylinder section.

15. The switching filter lens according to any one of claims 12 to 14, wherein the second barrel section includes a barrel section main body and a cover;

the lens cone section main body is connected with the first lens cone section, an opening is formed in the lens cone section main body, the filtering structure can be installed in the lens cone section main body through the opening, the cover body is arranged at the opening, and the cover body is detachably connected with the lens cone section main body.

16. A switched filter sensor, comprising:

a sensor housing provided with a light inlet;

the imaging sensor is arranged in the sensor shell, and a light sensing surface of the imaging sensor is opposite to the light inlet;

the light filtering structure according to any one of claims 1 to 11, wherein the light filtering structure is mounted in the sensor housing and located in an imaging light path between the light inlet and the imaging sensor;

17. A camera, comprising:

a lens;

the imaging sensor is arranged on the image side of the lens;

a filter structure according to any one of claims 1 to 11, wherein the filter structure is located in an imaging optical path of the camera, and the filter structure is located at an object side of the lens or between the lens and the imaging sensor;

18. A camera, comprising:

a switching filter lens according to any one of claims 12 to 15;

and the imaging sensor is arranged at the image side of the switching filter lens, and the light sensing surface of the imaging sensor is opposite to the image side surface of the switching filter lens.

19. A camera, comprising:

a lens;

the sensor according to claim 16, wherein the lens is located outside a sensor housing of the sensor, an image side end of the lens is connected to a periphery of an edge of a light inlet of the sensor housing, and an image side surface of the lens is opposite to the light inlet.

20. An electronic device comprising the camera of any one of claims 17-19.

21. A control method of a camera, the camera including a filter structure provided in an imaging optical path, the filter structure being switchable between a first state and a second state, the filter structure allowing visible light in the imaging optical path to pass therethrough when the filter structure is in the first state, and allowing only infrared light in the imaging optical path to pass therethrough when the filter structure is in the second state, the control method comprising:

controlling the filtering structure to switch between the first state and the second state;

carrying out color frame exposure through an imaging sensor in the imaging optical path when the light filtering structure is in the first state so as to obtain a visible light image, and carrying out black and white frame exposure through the imaging sensor in the imaging optical path when the light filtering structure is in the second state so as to obtain a fog penetrating image;

and registering and fusing the visible light image and the fog-penetrating image to obtain a colored fog-penetrating image.