CN110809111B - Lens assembly, terminal equipment and light supplementing control method of terminal equipment - Google Patents
Lens assembly, terminal equipment and light supplementing control method of terminal equipment Download PDFInfo
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- CN110809111B CN110809111B CN201911178450.9A CN201911178450A CN110809111B CN 110809111 B CN110809111 B CN 110809111B CN 201911178450 A CN201911178450 A CN 201911178450A CN 110809111 B CN110809111 B CN 110809111B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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Abstract
The embodiment of the invention provides a lens assembly of a terminal device, the terminal device and a light supplement control method of the terminal device; the lens subassembly includes the camera lens and sets up in a plurality of light filling lamps in the camera lens outside, it is a plurality of the luminous intensity of light filling lamp can independently adjust in order to the independent light filling of a plurality of subregion in camera lens visual field. The lens assembly of this application embodiment can carry out independent light filling to the less or great subregion of illuminance in the camera lens field of view through the luminous intensity of independently adjusting the light filling lamp, can make the illuminance distribution in the field of view comparatively even to make terminal equipment's image picture luminance comparatively even, improve user's experience and feel.
Description
Technical Field
The invention relates to the technical field of terminal equipment, in particular to a lens assembly, terminal equipment and a light supplement control method of the terminal equipment.
Background
Taking a mobile phone as an example, a lens of the mobile phone is provided with a flash lamp for supplementing light, when shooting at a short distance or at an ultra-micro distance, the distance between the lens and a scene is very close and may be only a few millimeters to ten and several millimeters, the flash lamp cannot supplement light to the field of view in the micro distance or ultra-micro distance shooting mode, the illuminance in the field of view is obviously insufficient, and the scene in the field of view cannot be clearly shot. In the related art, the light supplement structure of the externally-hung lens is used for illuminating the scenery in the field of view in the close-range shooting mode, but the problem of uneven illumination in the field of view, which causes uneven brightness of an imaging picture, exists.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a lens assembly with uniform illuminance in a field of view, a terminal device, and a light supplement control method for a terminal device.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a lens assembly of a terminal device, including a lens and a plurality of light supplement lamps disposed outside the lens, where a light emitting intensity of each light supplement lamp can be independently adjusted to independently supplement light to a plurality of sub-areas of a field of view of the lens.
Furthermore, the shortest distance between the light supplement lamp and the circumferential outer edge of the lens is less than or equal to 5 mm.
Furthermore, the plurality of light supplement lamps are divided into a plurality of light supplement lamp groups, each light supplement lamp group comprises at least one light supplement lamp distributed along the radial direction, and the plurality of light supplement lamp groups are distributed along the circumferential direction of the lens.
Furthermore, a plurality of light filling lamp groups are uniformly distributed along the circumferential direction of the lens.
Further, the lens assembly comprises a sleeve sleeved outside the lens, and the light supplement lamp is arranged in a space between the lens and the sleeve.
Furthermore, the cross section of the sleeve is rectangular, and the light supplement lamp is arranged along two diagonal lines of the rectangle.
Furthermore, at least two light supplement lamps of the plurality of light supplement lamps are first light supplement lamps, the first light supplement lamps are fixedly arranged relative to the lens, and each sub-area is supplemented with light by at least one first light supplement lamp.
Furthermore, at least one of the plurality of light supplement lamps is a second light supplement lamp, and the second light supplement lamp is movably arranged relative to the lens to adjust the position of the second light supplement lamp for supplementing light to the field of view.
Further, the second light supplement lamp is a light supplement lamp closest to the edge of the lens in at least one light supplement lamp group.
Furthermore, the light filling lamp comprises a light source and a reflecting shade covering the outer side of the light source, and a reflecting surface used for reflecting light rays of the light source to the view field is formed on the reflecting shade.
Further, the reflecting surface is a paraboloid of revolution, and the light source is located at the focus of the paraboloid of revolution.
A second aspect of the embodiments of the present application provides a terminal device, including a photosensitive sensor, a processor, and any one of the lens assemblies described above; the photosensitive sensor is used for detecting the illumination corresponding to a plurality of subareas of the lens field; the processor is used for adjusting the light intensity of at least one light supplement lamp according to the illumination corresponding to the plurality of sub-areas.
A third aspect of the embodiment of the present application provides a light supplement control method for a terminal device, where the terminal device includes a lens and a plurality of light supplement lamps arranged outside the lens and distributed along a circumferential direction, and a light emitting intensity of each light supplement lamp can be independently adjusted to independently supplement light to a plurality of sub-areas of a lens field; the light supplement control method comprises the following steps:
detecting the illumination corresponding to a plurality of subareas of the lens field;
and controlling the plurality of light supplement lamps to independently supplement light to the lens view field according to the illumination corresponding to the plurality of sub-areas and a preset rule.
Further, the detecting the illuminance corresponding to the plurality of sub-areas of the lens field of view includes:
the illumination of a plurality of sub-regions is obtained according to electrical signals corresponding to a plurality of pixel units of the image sensor, wherein each sub-region corresponds to at least one pixel unit.
Furthermore, at least two of the plurality of light supplement lamps are first light supplement lamps, and the first light supplement lamps are fixedly arranged;
the preset rules include:
and comparing the illuminance corresponding to the sub-area with the average illuminance of the field of view, and when the illuminance corresponding to the sub-area exceeds the preset range of the average illuminance, adjusting the luminous intensity of the first light supplement lamp corresponding to the sub-area, wherein the average illuminance of the field of view is calculated from the illuminance of the plurality of sub-areas.
Further, before the detecting the illuminance corresponding to the plurality of sub-areas of the lens field of view, the fill-in light control method includes: and turning on all the first light supplement lamps.
Furthermore, at least one of the plurality of light supplement lamps is a second light supplement lamp, and the second light supplement lamp is movably arranged relative to the lens to adjust a sub-area irradiated by the second light supplement lamp;
the light supplement control method comprises the following steps: after the adjustment of the light intensity of the first light supplement lamp is finished, determining a target position in the lens view field, wherein the illumination is lower than the lower limit of the preset range of the average illumination, and controlling the second light supplement lamp to supplement light to the target position.
The lens component of this application embodiment can carry out independent light filling to the less or great subregion of illuminance in the camera lens visual field through the luminous intensity of independent regulation light filling lamp, can make the illuminance distribution in the visual field comparatively even to make terminal equipment's formation of image picture luminance comparatively even, improve user's experience and feel.
Drawings
Fig. 1 is a schematic structural diagram of a lens assembly according to an embodiment of the present application;
FIG. 2 is a top view of the structure shown in FIG. 1;
fig. 3 is a schematic structural diagram of a mobile phone camera to which the lens assembly of the embodiment of the present application is applied;
FIG. 4 is a schematic diagram of a mobile phone shooting a subject;
FIG. 5 is a sectional view of a photosensitive surface divided into a plurality of photosensitive areas according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a light supplement control method according to an embodiment of the present disclosure.
Detailed Description
It should be noted that the embodiments and technical features of the embodiments in the present application may be combined with each other without conflict, and the detailed description in the detailed description should be understood as an explanation of the gist of the present application and should not be construed as an undue limitation to the present application.
Before describing the lens assembly provided by the present application, an application scenario related to the lens assembly of various embodiments of the present application is first described. In the application scenario, the lens assembly may be fixed on any terminal device having a shooting function, where the terminal device may be a terminal device such as a smartphone, a tablet computer, a PDA (Personal Digital Assistant), a portable computer, and the like. The following embodiments are described by taking an example of the lens assembly applied to a mobile phone.
The lens is used in a mobile phone and generally belongs to a camera. As shown in fig. 3, the camera illustratively includes a PCB board 21, an image sensor 22, a holder 23, and a lens 11. The image sensor includes, but is not limited to, a CCD (charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor). The image sensor 22 is fixed on the PCB 21, the holder 23 is disposed on a side of the image sensor 22 close to the subject and connected to the PCB 21, the holder 23 is provided with a cavity for accommodating the lens 11, and the lens 11 is opposite to the image sensor 22. In the photographing process, light of a photographed object enters the camera, incident light firstly enters the lens 11 and then reaches the image sensor 22, photons in the light strike the image sensor 22 to generate movable charges, which is an internal photoelectric effect, the movable charges are collected to form electric signals, Digital-to-analog conversion is carried out through an A/D converter, namely, charge signals are converted into Digital signals, the Digital signals are sent to a Digital Signal Processor (DSP) for processing, and finally the Digital signals are transmitted to a screen of a terminal device to form a display image 18, namely, photographing of the photographed object is achieved. Specifically, the DSP includes an ISP (Image Signal Processor) and a JPEG encoder (JPEG Image decoder), wherein the ISP is a key for determining the smoothness of the Image. It will be appreciated that for CMOS, the DSP may be integrated within the CMOS. The CMOS has the advantages of high integration level, low power consumption, low cost and the like, and is more suitable for mobile phones with limited installation space.
The PCB board can be a hard board, a soft board or a rigid-flexible board. When the mobile phone adopts the CMOS, the CMOS can be applied to any one of a hard board, a soft board, or a rigid-flex board. When the mobile phone adopts the CCD, only the rigid-flexible board can be used, and the rigid-flexible board has the highest price among the three boards, so that when the CCD is adopted, the cost of the mobile phone is higher.
In the embodiment of the application, the camera can perform close-range macro-shooting, the macro-shooting refers to that the terminal equipment shoots at a larger optical magnification ratio when being close to a shot object on the premise of ensuring the clear imaging of the shot object through the optical capability of the lens, wherein the optical magnification ratio refers to the ratio of the imaging height of the image sensor to the height of the shot object.
It should be noted that, the magnification sensed by the user is an optical magnification, i.e., a screen magnification, i.e., a digital magnification, the optical magnification refers to a ratio of a height of an image formed on the image sensor to a height of a subject, the screen magnification refers to a ratio of a screen size to a size of the image sensor, and the digital magnification refers to a ratio of a size on the screen after the user manually enlarges a part of the screen to generate enlargement of the same part to a size on the screen before enlargement. Specifically, for example, as shown in fig. 4, the light reflected by the object 17 reaches the image sensor 22 after passing through the lens 11, and then generates an electrical signal, which is converted into a digital signal by the analog-to-digital conversion device, and then transmitted to the screen of the terminal device to form the image 18 after being processed by the DSP, and the user can enlarge a part of the image 18 on the screen as needed, and the image displayed on the screen is the screen enlarged image 19.
Specifically, according to the basic optical imaging principle, tan (FOV/2) is the imaging height/focal length which is the subject height/object distance, and the optical magnification is the imaging height/subject height which is the focal length/object distance. The FOV is a field angle, which is an angle formed by two sides of an optical instrument, wherein the center of a lens of the optical instrument is a vertex, and a measured object or an object to be shot can pass through the center of the lens in the largest range. The FOV is typically measured as the field of view of the lens, e.g., a conventional standard lens with an angle of view around 45 degrees and a wide-angle lens with an angle of view above 60 degrees. According to the above formula for calculating the optical magnification, the increase of the optical magnification can be realized by reducing the working distance or increasing the focal length, that is, on the premise of ensuring clear imaging, the lens is as close to the object to be shot as possible and the focal length of the lens is increased.
According to the Gaussian imaging formula, 1/f is 1/u + 1/v. Wherein f is the focal length; u is the object distance; v is the image distance; when u >2f, a reduced inverted image is formed on the image sensor 22; when u is 2f and v is f, namely the focal length is equal to the image distance, an equal-size inverted image is formed on the image sensor 22; f < u <2f, which is an enlarged inverted image on the image sensor 22; when u is f, no imaging is carried out; when u < f, it is a virtual image and cannot be imaged on the image sensor 22. Therefore, v and u have opposite changing trends with constant focal length f, and v decreases with increasing u and v increases with decreasing u. Since macro photography is a photography method for obtaining an enlarged image of a subject in close range, i.e., an enlarged real image is formed on an image sensor, the subject distance u is relatively small and the working distance is correspondingly small during close range macro photography, so that the focal length of the lens needs to be smaller to meet the requirement of focusing, so as to ensure that f < u <2f, and the image distance and the subject distance meet the above gaussian imaging formula.
In the embodiment of the application, the lens can be an ultra-macro lens, namely a lens which can clearly shoot with large optical magnification under the condition of small object distance. The internationally acknowledged statement in the photographic world is that shooting with optical magnification of about 1: 1-1: 4 belongs to macro photography, and in the embodiment of the application, the ultra-macro lens refers to a macro lens which can still realize focusing when the working distance is less than 10mm, namely, an image sensor can still clearly image when the working distance is less than 10 mm. It should be noted that the term "less than" in the embodiments of the present application does not include the present number.
The ultramicro-lens can be a long-focus ultramicro-lens or a wide-angle ultramicro-lens. In the embodiment Of the present application, the macro lens is a wide-angle macro lens, and illustratively, an effective focal length f Of the wide-angle macro lens is 1.335mm, a Field Of View (FOV) at a maximum image height is 77.6 degrees, an aperture value (f-number) is 2.8, and a minimum working distance is 3mm, where the working distance is a distance from a subject to a front end Of the lens, that is, the lens can focus on a subject at an object distance Of about 3 mm.
When the shot object distance is only a few millimeters, the terminal equipment can cover the shot object, the illumination of the shot object area is insufficient, and therefore light needs to be supplemented to the view field during macro or ultra-micro shooting.
Referring to fig. 1, an embodiment of the present application provides a lens assembly, which includes a lens 11 and a plurality of light supplement lamps 12 disposed outside the lens 11, where the light emitting intensity of each light supplement lamp 12 can be independently adjusted to independently supplement light to a plurality of sub-areas of a field of view of the lens 11.
It should be noted that the lens 11 may be a conventional independent lens, or a composite lens composed of a lens and another lens or lenses; as will be appreciated by those skilled in the art, in an optical imaging system, the device for imaging a subject onto an image sensor is a lens. In particular, the lens 11 according to the embodiment of the present invention is a macro lens capable of performing macro imaging, and can perform imaging in macro or super macro. The outer side of the lens means a space around the lens, and the front view of the lens (facing the subject during shooting) is generally circular, and the radial direction means a direction extending along the diameter of the circle in the circumferential direction, i.e., a direction around the circle.
The field of view refers to a region of the corresponding subject that can be seen on the screen of the terminal device. The plurality of sub-areas of the field of view means that the field of view corresponding to the lens is divided into a plurality of sub-areas, and each sub-area is a part of the field of view. It will be appreciated that the size and distribution of the sub-regions is not limited.
For example, when the illuminance of a certain sub-region in the field of view is small, the light emitting intensity of the fill-in light 12 corresponding to the position where the illuminance is small may be increased, so that the illuminance distribution of the field of view tends to be uniform; for another example, if the light intensity of a certain sub-region in the field of view is strong, the light intensity of the fill-in light 12 corresponding to the position with the strong illuminance may be reduced, so that the illuminance distribution of the field of view tends to be uniform. Therefore, the lens assembly of the embodiment of the application can independently supplement light for the sub-area with smaller or larger illuminance in the field of view of the lens 11 by independently adjusting the luminous intensity of the light supplement lamp 12, so that the illuminance distribution in the field of view is more uniform, the brightness of the imaging picture of the terminal device is more uniform, and the experience of a user is improved.
In an embodiment, referring to fig. 1, the fill-in light 12 includes a light source 121 and a reflector 122 covering the light source 121, and the reflector 122 is formed with a reflective surface 122a for reflecting light from the light source 121 to the field of view of the lens 11. The specific structure of the reflector 122 is not limited as long as it can reflect the light of the fill-in lamp 12 to the field of view through the reflecting surface 122 a.
The specific shape of the reflective surface 122a is required to facilitate the reflection of the light, in an embodiment, the reflective surface 122a is a paraboloid of revolution, the light source 121 is located at the focus of the paraboloid of revolution, and the paraboloid of revolution can reflect the light radiated by the light source 121 to the direction parallel to the main axis of the paraboloid of revolution, that is, to emit the light as an approximately parallel light beam, during the process of transmitting the parallel light beam to the object to be photographed, the luminous flux of the parallel light beam is substantially unchanged, and the light beam can be relatively intensively directed to a local position in the field of view.
It should be noted that the wavelength band of the light radiated by the light source 121 is adapted to the wavelength band of the light to be collected by the lens 11. For example, when the lens 11 needs to collect infrared light, the light source 121 radiates infrared light. For another example, when the light collected by the lens 11 is visible light, the light source 121 radiates the visible light.
In an embodiment, the shortest distance between the light supplement lamp 12 and the outer edge of the lens 11 is less than or equal to 5mm, the light supplement lamp 12 is closer to the lens 11 at the distance, when the terminal device adopts a macro-shooting mode, light beams emitted by the light supplement lamp 12 can be projected into the field of view of the lens 11, light supplement is performed relatively uniformly on the field of view by adjusting the luminous intensity of the light supplement lamp 12, and therefore the brightness of an imaging picture shot by the terminal device at macro and ultra-macro distances is sufficient through light supplement and is relatively uniform in brightness.
The shortest distance between the fill-in light 12 and the outer edge of the lens 11 refers to the shortest distance between the reflective surface 122a and the edge of the lens 11 along the horizontal direction shown in fig. 1.
The arrangement positions of the plurality of light supplement lamps 12 around the lens 11 are not limited, and the light supplement lamps can be conveniently installed, so that the light supplement lamps can uniformly supplement light to each sub-area of the view field and reduce interference among the sub-areas as much as possible. For example, referring to fig. 2, the plurality of fill-in lamps 12 are divided into a plurality of fill-in lamp sets, each fill-in lamp set includes at least one fill-in lamp 12 distributed along a radial direction, and the plurality of fill-in lamp sets are distributed along a circumferential direction. That is, a plurality of fill light groups are arranged around the circumference of the lens 11. For example, in this embodiment, the number of the light supplement lamp groups is 4, and each light supplement lamp group includes 3 light supplement lamps. It should be noted that the number of the fill-in lamps included in each fill-in lamp group may be the same or different.
In an embodiment, the plurality of light supplement lamp sets are uniformly distributed along the circumference of the lens 11, that is, the included angle between two adjacent light supplement lamp sets is the same, for example, referring to fig. 2, in the embodiment of the present application, the included angle between two adjacent light supplement lamp sets is 90 °. The plurality of fill light lamps 12 can be more reasonably arranged at even intervals. It will be appreciated that the non-uniform spacing arrangement is also possible.
In an embodiment, referring to fig. 1 and 2, the lens assembly includes a sleeve 13 sleeved outside the lens 11, the inner surface of the sleeve 13 and the outer edge of the lens 11 are disposed at intervals, and the fill-in light 12 is disposed in a space between the lens 11 and the sleeve 13. On the one hand, the sleeve 13 facilitates installation of the light supplement lamp 12, for example, the light supplement lamp 12 can be connected to a suitable position of the sleeve 13, and on the other hand, the sleeve 13 protects the light supplement lamp 12, prevents other components from scratching the light supplement lamp 12, and ensures stability of an installation position of the light supplement lamp 12.
The shape of the sleeve 13 is not limited, and for example, the cross-sectional shape of the sleeve 13 may be rectangular, circular, polygonal, or the like. In an embodiment, referring to fig. 2, the cross section of the sleeve 13 is rectangular, the plurality of fill-in lamps 12 are arranged along two diagonal lines of the rectangle, and the two diagonal lines of the rectangle have a larger installation space. The arrangement of the light supplement lamps 12 along two diagonal lines of the rectangle means the arrangement position relationship of the light supplement lamps 12 in the projection of the cross section. It is understood that the plurality of fill lights 12 may be located in the same plane or may not be located in the same plane.
In an embodiment, referring to fig. 2, at least two light supplement lamps 12 of the light supplement lamps 12 are first light supplement lamps 12 ', that is, the partial light supplement lamps 12 are named as first light supplement lamps 12 ', for example, in the embodiment shown in fig. 2, the number of the light supplement lamps 12 is 12, and 9 of the light supplement lamps are first light supplement lamps 12 '. The first light supplement lamp 12 'is fixedly arranged relative to the lens 11, that is, the angle of the light beam emitted by the first light supplement lamp 12' keeps fixed relative to the incident light direction of the lens 11, and the first light supplement lamp 12 'fixedly supplements light to one of the subregions of the field of view, that is, after the first light supplement lamp 12' is turned on, only the luminous intensity can be adjusted, and the irradiated subregion cannot be changed. When controlling first light filling lamp 12 'light filling, only need control first light filling lamp 12' luminous intensity can, need not to adjust the angle of the light beam that sends of each first light filling lamp 12 ', so can reduce control complexity, be convenient for to the control of a plurality of first light filling lamps 12', reduction production manufacturing cost.
In order to realize relatively uniform light supplement on the field of view through the first light supplement lamp 12 ', each sub-region is supplemented with light by at least one first light supplement lamp 12'. Since the photosensitive surface of the terminal device is mostly rectangular, the sub-regions may be divided as follows: the rectangular photosensitive surface of the terminal device is used as a dividing basis, the rectangular photosensitive surface is divided into a plurality of photosensitive areas, the photosensitive areas correspond to the sub-areas in the field of view one by one, and the arrangement relation of the first light supplement lamps 12' meets the following requirements: each first fill light 12' fixedly corresponds to a sub-area of the field of view.
It can be understood that the number of the first light supplement lamps 12 'may correspond to the number of the sub-regions one to one, that is, one first light supplement lamp 12' is fixed to supplement light to one sub-region; or each sub-region may correspond to a plurality of first fill-in lamps 12 ', for example, each two first fill-in lamps 12' fill in light to one sub-region together. When the number of the photosensitive areas is more than the number of the photosensitive areas, it can be considered that one first fill-in light 12' corresponds to one sub-area; if the number of photosensitive regions is divided into a small number, two or more fill lamps 12 may be considered to correspond to one sub-region.
In the present embodiment, referring to fig. 5, a rectangular photosensitive surface is divided into 9 photosensitive regions, which are a1, a2, a3, a4, a5, a6, a7, a8, and a 9; referring to fig. 2, the number of the first fill-in lamps 12 'is 9, wherein four outermost first fill-in lamps 12' along the diagonal direction correspond to the sub-regions of the field of view corresponding to a1, a2, a3, and a4 in fig. 5 one by one; the four first fill-in lamps 12' in the middle in the diagonal direction respectively correspond to the sub-regions of the field of view corresponding to a5, a6, a7 and a8 in fig. 5 in a one-to-one manner; the remaining one of the first fill-in lamps 12' corresponds to one of the sub-regions of the field of view corresponding to a9 in fig. 5.
In an embodiment, please continue to refer to fig. 2, at least one light supplement lamp 12 of the plurality of light supplement lamps 12 is a second light supplement lamp 12 ', and the second light supplement lamp 12 ' is movably disposed relative to the lens 11 to adjust a position of the second light supplement lamp 12 ' for supplementing light to the field of view, that is, an angle of a light beam emitted by the second light supplement lamp 12 ' can be changed, so that the position of the second light supplement lamp 12 ' for supplementing light to the field of view can be changed. When terminal equipment adopts the macro shooting mode, can all open first light filling lamp 12 ', carry out adjustment back many times to the luminous intensity of first light filling lamp 12 ', the illuminance of some positions in the visual field is still lower for local position luminance in the image frame is lower, can open second light filling lamp 12 ' under this condition, the angle of the light beam that sends of adjustment second light filling lamp 12 ' makes the light beam of second light filling lamp 12 ' transmission aim at the position that the illuminance is less to carry out the light filling can. And the second light supplement lamp 12' is used for performing targeted light supplement, so that the brightness of the imaging picture of the terminal equipment is more uniform. It should be noted that the light supplement position of the second light supplement lamp 12 'may not be divided according to the sub-regions, that is, the second light supplement lamp 12' may supplement light to any position in the field of view.
Because the angle of the light beam emitted by the second light supplement lamp 12 ' can be adjusted, the number of the second light supplement lamp 12 ' can be less than that of the first light supplement lamp 12 ' so as to meet the light supplement requirement and cost control.
The number of the second fill-in lamps 12' may be one or more, and may be set according to actual needs.
In this embodiment, the second fill-in light is a fill-in light closest to the edge of the lens in at least one fill-in light group. For example, in fig. 2, the number of the fill-in light groups is four, and the fill-in light closest to the lens edge in the three fill-in light groups is the second fill-in light 12 ', that is, in this embodiment, the number of the second fill-in light 12' is three.
A second aspect of embodiments of the present application provides a terminal device, including a photosensitive sensor, a processor, and the lens assembly of any of the above embodiments.
The photosensitive sensor is used for detecting the illuminance corresponding to a plurality of sub-areas in the field of view of the lens 11.
The processor is configured to control the light intensity of at least part of the fill-in light 12 according to the illuminance corresponding to the plurality of sub-areas.
For example, the processor determines which sub-region has to be increased in illuminance and the amplitude of the increase in illuminance, which sub-region has to be decreased in illuminance and the amplitude of the decrease in illuminance, and controls the light supplement lamps 12 corresponding to the sub-regions to supplement light according to the determined scheme.
The specific type of the photosensitive sensor is not limited as long as the illuminance of each of the plurality of sub-regions in the field of view described above can be adjusted.
In an embodiment, the photosensitive sensor may be an image sensor located in a camera, that is, other photosensitive sensors do not need to be additionally arranged, and the terminal device only needs to use an existing image sensor. Specifically, after the image sensor converts the optical image signal collected by the lens 11 into an electrical signal, there is a certain corresponding relationship between the optical image signal and the electrical signal, that is, the electrical signal is analyzed to obtain the corresponding illumination.
The image sensor is provided with a plurality of pixel units, each pixel unit comprises a plurality of pixels arranged in an array, and the plurality of pixel units jointly complete the photosensitive processing process of the image sensor. Therefore, in the embodiment of the present application, the photosensitive surface of the image sensor is divided into a plurality of photosensitive areas according to the pixel units, and each pixel unit corresponds to one photosensitive area. After each pixel unit is exposed to light, each pixel unit outputs a corresponding electric signal, and the electric signals and the illumination have a certain corresponding relation, so that the processor can acquire the illumination of the view field subarea corresponding to each pixel unit according to the electric signals output by each pixel unit.
In the embodiment of the application, the image sensor is used for detecting the illumination, and other photosensitive sensors are not required to be additionally arranged, so that the production cost can be saved, the installation space can be saved, and the structure of the lens assembly is more compact.
A third aspect of the embodiment of the present application provides a light supplement control method for a terminal device, where the terminal device includes a lens 11 and a plurality of light supplement lamps 12 arranged on the outer side of the circumference of the lens 11, and the light emitting intensity of the light supplement lamps 12 can be independently adjusted to independently supplement light to the view field of the lens 11. Specifically, the terminal device may be the terminal device of any of the above embodiments.
Referring to fig. 6, the light supplement control method includes:
s1: the illuminance corresponding to a plurality of sub-areas of the field of view of the lens 11 is detected.
For example, since the photosensitive surface of the terminal device is mostly rectangular, the sub-regions of the field of view may be divided as follows: the rectangular photosensitive surface is divided into a plurality of photosensitive areas by taking the rectangular photosensitive surface as a division basis, the photosensitive areas correspond to the sub-areas in the field of view one by one, and the arrangement relation of the first light supplement lamps 12' meets the following requirements: each first fill light 12' fixedly corresponds to a sub-area of the field of view. It can be understood that the number of the first light supplement lamps 12 'may correspond to the number of the sub-regions one to one, that is, one first light supplement lamp 12' is fixed to supplement light to one sub-region; or each sub-area may correspond to a plurality of first fill-in lamps 12'. For example, when the number of the photosensitive regions is more than a predetermined number, one first fill-in light 12' may be considered to correspond to one sub-region; if the number of photosensitive regions is divided into a small number, two or more fill lamps 12 may be considered to correspond to one sub-region.
S2: and controlling the plurality of light supplement lamps 12 to independently supplement light to the field of view of the lens 11 according to the illumination corresponding to the plurality of sub-areas.
Specifically, at least two of the plurality of fill-in lamps 12 are first fill-in lamps 12 ', and the first fill-in lamps 12' are fixedly disposed. The preset rules include:
comparing the illumination corresponding to the sub-region with the average illumination of the field of view; and when the illumination corresponding to the sub-area exceeds the preset range of the average illumination, adjusting the luminous intensity of the first light supplement lamp corresponding to the sub-area. Wherein the average illumination of the field of view may be calculated from the intensities of the plurality of sub-regions.
The preset range of the average illuminance may be set as needed, for example, the preset range is: based on the average illuminance, for example, the average illuminance is X lux, the first preset value, for example, 10%, is floated upward, and the second preset value, for example, 8%, is floated downward, where the preset range is [ X (1-8%), X (1+ 8%) ]. If the illumination of the sub-area exceeds the preset range, adjusting the illumination of the sub-area; if the illuminance of the sub-region is within the preset range, the deviation between the illuminance of the sub-region and the average illuminance is within the tolerance range, and the illuminance of the sub-region does not need to be adjusted. Therefore, the adjusting frequency of the first light supplement lamp 12' can be reduced, the adjusting time is shortened, and the adjusting efficiency is improved.
It is understood that the first preset value and the second preset value may be the same or different. The first preset value and the second preset value can be set according to requirements.
It is understood that the above steps S21 and S22 may be repeated a plurality of times.
Specifically, at least one of the plurality of light supplement lamps 12 is a second light supplement lamp 12 ', and the second light supplement lamp 12 ' is movably disposed relative to the lens to adjust a position of the second light supplement lamp 12 ' for supplementing light to the field of view.
When the above step S22 is repeated a plurality of times, the illuminance at some positions may be lower than the lower limit of the preset average illuminance range, and the brightness at the positions still existing on the imaging screen may be relatively dark. In this case, light may be supplemented again by the second supplementary light lamp 12'.
Specifically, the control method further includes:
after the adjustment of the light intensity of the first light supplement lamp 12 'is finished, a target position where the illumination in the field of view of the lens 11 is lower than the lower limit of the preset range of the current average illumination of the field of view is determined, and the second light supplement lamp 12' is controlled to supplement light to the target position.
According to the embodiment of the application, the second light supplement lamp 12' is used for supplementing light to the position with lower field illumination, so that the uniformity of the field illumination is improved to a greater extent.
The following describes a control method according to an embodiment of the present application in detail with reference to the embodiments.
When the terminal equipment adopts the macro shooting mode, all the first light supplement lamps 12 ' are turned on, that is, the default setting of the terminal equipment is to automatically turn on the first light supplement lamps 12 ' and keep the second light supplement lamps 12 ' off in the macro shooting mode. In this case, the light intensity of the first fill light 12' is set by default.
During the imaging process of the terminal device, the image sensor detects the illumination of each subarea in the field of view, and the processor can calculate the average illumination of the whole field of view according to the illumination of each subarea and compare the illumination of each subarea with the average illumination.
If the illuminance corresponding to a certain sub-region is higher than the upper limit of the preset average illuminance range, the light emitting intensity of the first fill-in light 12' corresponding to the sub-region is reduced. If the illuminance corresponding to a certain sub-region is lower than the lower limit of the preset average illuminance range, increasing the light-emitting intensity of the first light supplement lamp 12' corresponding to the sub-region; if the illuminance corresponding to a certain sub-region is within the preset average illuminance range, the light emitting intensity of the first fill-in light 12' corresponding to the sub-region does not need to be adjusted.
It is understood that, in an embodiment, the illuminance of all the sub-areas may be compared with the average illuminance at one time, and then each first fill-in light 12 ' that needs to adjust the light-emitting intensity is adjusted, that is, after the light-emitting intensity of one of the first fill-in lights 12 ' is adjusted, the average intensity does not need to be calculated again, and the light-emitting intensity of the first fill-in light 12 ' is directly adjusted according to the previous comparison result. In another embodiment, after the light intensity of the first fill-in light 12' is adjusted, the current average illumination of the field of view is recalculated, and then the illumination of the sub-region is adjusted according to the comparison result and the current average illumination.
If the illuminance of all the sub-regions is within the preset range of the average light intensity after the adjustment in the steps S21 and S22, it indicates that the uniformity of the brightness of the imaged picture has reached the requirement, and no light is required to be supplemented by the second light supplement lamp 12'.
If the target position with the illuminance lower than the lower limit of the preset range of the average illuminance exists in the field of view after the adjustment of the steps S21 and S22 for a plurality of times, that is, after the illuminance at the target position is supplemented by the first supplementary lighting lamp 12', the illuminance still cannot meet the requirement. In this case, the second fill-in light 12' is controlled to fill in light to the target position. The target position may not specifically appear at any position in the field of view, and therefore, it is necessary to determine the approximate coordinates of the target position, and adjust the angle of the light beam emitted by the second fill-in light 12 ', so that the second fill-in light 12' fills in light to the target position.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (13)
1. Terminal equipment's camera lens subassembly, its characterized in that includes:
the lens is a macro lens;
the light supplement lamps are arranged on the outer side of the lens, the light emitting intensity of each light supplement lamp can be independently adjusted to independently supplement light to a plurality of sub-areas of the field of view of the lens, the light supplement lamps are divided into a plurality of light supplement lamp groups, each light supplement lamp group comprises a plurality of light supplement lamps distributed along the radial direction, and the light supplement lamp groups are distributed along the circumferential direction of the lens;
at least two of the light supplement lamps are first light supplement lamps, the first light supplement lamps are fixedly arranged relative to the lens, and each sub-area is supplemented with light by at least one first light supplement lamp;
at least one of the light supplementing lamps is a second light supplementing lamp, and the second light supplementing lamp is movably arranged relative to the lens so as to adjust the position of the second light supplementing lamp for supplementing light to the field of view;
the second light supplement lamp is the light supplement lamp closest to the edge of the lens in at least one light supplement lamp group.
2. The lens assembly of claim 1, wherein a shortest distance between the fill light and an outer edge of the lens is less than or equal to 5 mm.
3. The lens assembly of claim 1, wherein the plurality of light supplement lamp sets are evenly distributed along a circumferential direction of the lens.
4. The lens assembly of claim 1, wherein the lens assembly comprises a sleeve disposed outside the lens, and the fill-in light is disposed in a space between the lens and the sleeve.
5. The lens assembly of claim 4, wherein the sleeve has a rectangular cross-sectional shape, and the fill light is arranged along two diagonal lines of the rectangular cross-sectional shape.
6. The lens assembly of any one of claims 1-5, wherein the fill-in light comprises a light source and a reflector covering the light source, and the reflector is formed with a reflective surface for reflecting light from the light source to the field of view.
7. The lens assembly of claim 6, wherein the light reflecting surface is a paraboloid of revolution, and the light source is located at a focus of the paraboloid of revolution.
8. Terminal equipment, characterized by, includes:
the lens assembly of any of claims 1-7;
the photosensitive sensor is used for detecting the illumination corresponding to the plurality of subareas of the lens field;
and the processor is used for adjusting the luminous intensity of at least one light supplement lamp according to the illumination corresponding to the plurality of sub-areas.
9. A light supplement control method for a terminal device, the method being used in the terminal device according to claim 8, the light supplement control method comprising:
detecting the illumination corresponding to a plurality of subareas of the lens field;
and controlling the plurality of light supplement lamps to independently supplement light to the lens view field according to the illumination corresponding to the plurality of sub-areas and a preset rule.
10. The light supplement control method according to claim 9, wherein the detecting the illuminance corresponding to the plurality of sub-regions of the lens field of view comprises:
the method comprises the steps of obtaining the illumination of a plurality of sub-areas according to electric signals corresponding to a plurality of pixel units of an image sensor, wherein each sub-area corresponds to at least one pixel unit.
11. A light supplement control method according to claim 9, wherein the preset rules include: and comparing the illuminance corresponding to the sub-area with the average illuminance of the field of view, and when the illuminance corresponding to the sub-area exceeds the preset range of the average illuminance, adjusting the luminous intensity of the first light supplement lamp corresponding to the sub-area, wherein the average illuminance of the field of view is calculated from the illuminance of the plurality of sub-areas.
12. A fill-in light control method according to claim 11, wherein before the detecting the illuminance corresponding to the plurality of sub-regions of the lens field of view, the fill-in light control method comprises: and turning on all the first light supplement lamps.
13. A light supplement control method according to claim 11, the light supplement control method comprising: and after the adjustment of the light intensity of the first light supplement lamp is finished, determining a target position with illumination lower than the lower limit of the preset average illumination range in the lens view field, and controlling the second light supplement lamp to supplement light to the target position.
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| CN111314586B (en) * | 2020-02-19 | 2021-08-10 | 北京小米移动软件有限公司 | Light supplementing assembly, control method thereof, camera module and mobile terminal |
| CN113824891B (en) * | 2020-06-19 | 2023-06-09 | 浙江宇视科技有限公司 | Camera, light supplementing method, device and medium thereof |
| CN113747012B (en) * | 2021-08-31 | 2023-03-24 | 浙江大华技术股份有限公司 | Camera device, light supplementing method and medium |
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