CN115514899A - Shooting method and device, computer readable medium and electronic equipment - Google Patents
Shooting method and device, computer readable medium and electronic equipment Download PDFInfo
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Abstract
The disclosure provides a shooting method and device, a computer readable medium and electronic equipment, and relates to the technical field of image shooting. The method comprises the following steps: acquiring an ambient light distribution image in a shooting scene, wherein the ambient light distribution image comprises at least two image areas; determining the light source flicker type of each image area through the environment light distribution image; determining a target anti-flicker mode of each image area according to the flicker type of the light source; and carrying out light source flicker elimination on the image frames acquired in the shooting scene based on the target flicker-resistant mode to obtain the image frames with the light source flicker eliminated. The method and the device can detect different light sources existing in the current shooting scene, determine the light source flicker type in the current shooting scene, and further adopt different flicker-resistant modes for different image areas, effectively inhibit the light source flicker phenomenon, and improve the collected video quality.
Description
Technical Field
The present disclosure relates to the field of image capturing technologies, and in particular, to a capturing method, a capturing apparatus, a computer-readable medium, and an electronic device.
Background
Along with the continuous improvement of the living standard of people, the quality of shot images is more and more concerned by people. The Flicker (Flicker) is a phenomenon that when the Flicker frequency is faster than any shutter moving time, a banded shadow or partial color change may occur on an image acquired by a camera due to the intermittent Flicker of a certain light source.
At present, in a related scheme for eliminating light source flicker, light source flicker frequency in an image is generally detected by a frame difference method, but the method for detecting light source flicker frequency by the frame difference method is not only low in accuracy, but also cannot eliminate light source flicker in a scene with multiple light source flicker frequencies, resulting in poor quality of a shot video picture.
Disclosure of Invention
The present disclosure aims to provide a shooting method, a shooting device, a computer readable medium, and an electronic device, so as to solve, at least to a certain extent, a problem that a scene with multiple light source flicker frequencies cannot be subjected to light source flicker elimination in the related art, and improve accuracy of light source flicker elimination.
According to a first aspect of the present disclosure, there is provided a photographing method including:
acquiring an ambient light distribution image in a shooting scene, wherein the ambient light distribution image comprises at least two image areas;
determining a light source flicker type of each image area through the environment light distribution image;
determining a target anti-flicker mode of each image area according to the light source flicker type;
and carrying out light source flicker elimination on the image frames collected in the shooting scene based on the target flicker-resistant mode to obtain the image frames with the light source flicker eliminated.
According to a second aspect of the present disclosure, there is provided a photographing apparatus including:
the system comprises an ambient light image acquisition module, a light distribution acquisition module and a light distribution acquisition module, wherein the ambient light image acquisition module is used for acquiring an ambient light distribution image in a shooting scene, and the ambient light distribution image comprises at least two image areas;
the light source flicker type determining module is used for determining the light source flicker type of each image area through the environment light distribution image;
the anti-flicker mode determining module is used for determining a target anti-flicker mode of each image area according to the light source flicker type;
and the light source flicker elimination module is used for eliminating light source flicker of the image frames acquired in the shooting scene based on the target flicker-resistant mode to obtain the image frames with the light source flicker eliminated.
According to a third aspect of the present disclosure, a computer-readable medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the above-mentioned method.
According to a fourth aspect of the present disclosure, there is provided an electronic apparatus, comprising:
a multi-window anti-flicker sensor;
a processor; and
a memory for storing one or more programs that, when executed by the one or more processors, cause the one or more processors to implement the above-described method.
The shooting method provided by the embodiment of the disclosure can acquire an environment light distribution image in a shooting scene, the environment light distribution image can include at least two image areas, the light source flicker type of each image area is determined through the environment light distribution image, then the target flicker-resistant mode of each image area can be determined according to the light source flicker type, and finally the light source flicker elimination can be performed on the image frame acquired in the shooting scene based on the target flicker-resistant mode to obtain the image frame after the light source flicker elimination. The method has the advantages that the environmental light distribution image can be divided into at least two image areas, the target anti-flicker modes corresponding to the image areas are respectively determined through the determined light source flicker types, and then the corresponding anti-flicker modes can be adopted for the light source flicker phenomena distributed at different positions in the shooting scene, so that the light source flicker phenomena in the multi-light source shooting scene are effectively inhibited, the accuracy of the processing result is improved, and the quality of the camera preview picture or the shooting video picture is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty. In the drawings:
FIG. 1 illustrates a schematic diagram of an exemplary system architecture to which embodiments of the present disclosure may be applied;
FIG. 2 schematically illustrates a schematic diagram of one embodiment of the present disclosure for generating a light source flicker phenomenon;
fig. 3 schematically illustrates a flow chart of a photographing method in an exemplary embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a multi-window anti-flicker sensor for acquiring an image of an environmental light distribution according to an exemplary embodiment of the present disclosure;
FIG. 5 schematically illustrates a flow chart for determining a type of light source flicker in an exemplary embodiment of the present disclosure;
FIG. 6 is a diagram schematically illustrating a flicker frequency of a light source obtained by ambient light data conversion according to an exemplary embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating a flow chart of a method for eliminating flicker of a light source by a first anti-flicker manner according to an exemplary embodiment of the disclosure;
FIG. 8 is a schematic diagram schematically illustrating a principle of eliminating a flicker phenomenon of a light source by adjusting an exposure time in an exemplary embodiment of the present disclosure;
FIG. 9 is a schematic diagram illustrating a process for eliminating flicker of a light source by a second flicker resistant method according to an exemplary embodiment of the present disclosure;
FIG. 10 schematically illustrates a schematic view of a core region and a non-core region in an exemplary embodiment of the disclosure;
FIG. 11 is a schematic flow chart illustrating a method for eliminating flicker of a light source according to an exemplary embodiment of the disclosure;
fig. 12 schematically illustrates a composition diagram of a photographing apparatus in an exemplary embodiment of the present disclosure;
fig. 13 shows a schematic diagram of an electronic device to which an embodiment of the disclosure may be applied.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
Fig. 1 is a schematic diagram illustrating a system architecture of an exemplary application environment to which a photographing method and apparatus according to an embodiment of the present disclosure may be applied.
As shown in fig. 1, the system architecture 100 may include one or more of terminal devices 101, 102, 103, a network 104, and a server 105. The network 104 serves as a medium for providing communication links between the terminal devices 101, 102, 103 and the server 105. Network 104 may include various connection types, such as wired, wireless communication links, or fiber optic cables, among others. The terminal devices 101, 102, 103 may be various electronic devices having image capturing and ambient light capturing functions, and may include, but are not limited to, desktop computers, portable computers, smart phones, tablet computers, and the like. It should be understood that the number of terminal devices, networks, and servers in fig. 1 is merely illustrative. There may be any number of terminal devices, networks, and servers, as desired for implementation. For example, server 105 may be a server cluster comprised of multiple servers, or the like.
The shooting method provided by the embodiment of the present disclosure is generally executed by the terminal devices 101, 102, 103, and accordingly, the shooting device is generally disposed in the terminal devices 101, 102, 103. However, it is easily understood by those skilled in the art that the shooting method provided by the embodiment of the present disclosure may also be executed by the server 105, and accordingly, the shooting device may also be disposed in the server 105, which is not particularly limited in the exemplary embodiment. For example, in an exemplary embodiment, a user may acquire an ambient light distribution image in a shooting scene through the terminal devices 101, 102, and 103, and then upload the ambient light distribution image to the server 105, and after the server determines a target anti-flicker manner for different image areas through the shooting method provided by the embodiment of the present disclosure, the target anti-flicker manner is transmitted to the terminal devices 101, 102, and 103 to perform light source flicker elimination, so as to effectively reduce the calculation amount of the terminal devices 101, 102, and 103.
As the intermittent flashing of one or more light sources in the shooting scene may cause a phenomenon of a band-shaped shadow or partial color change on an image captured by a camera, referring to fig. 2, the flashing frequency of the light source may be abstracted into periodically distributed vertical bars, and the time is represented by a horizontal axis, so that the presence of the flashing frequency 210 of the light source in the shooting scene may be abstracted by a graph. When a camera of a terminal device shoots an image, due to the working principle of an electronic rolling shutter of the camera, namely, the effect of moving a front curtain is achieved by resetting an image sensor row by row, then, a rear curtain plays a role of reading row by row, and the time of reading the whole image sensor row by row needs tens of milliseconds, so that the time spent on the curtain seam movement of the electronic shutter is longer, when the Flicker frequency of a light source is faster than the shutter movement opportunity, such as the light source Flicker frequency 210, and the exposure time of the camera is less than one period of the light source Flicker frequency 210, an image frame 220 can be shot, the image frame 220 has obvious belt-shaped shadows, and rolling black and white stripes, namely, the light source Flicker flickers, can be generated when a picture is previewed or a video is shot.
In a related technology, a light source flicker frequency existing in a current scene can be detected through a frame difference method, a continuous front and back image frame is subjected to graying processing, then the difference between the front and back image frame is carried out to judge the variation of a belt-shaped shadow in the image frame, and further the light source flicker frequency in the current scene is determined. However, the detection result obtained by the scheme has low accuracy, and due to more interference factors in the shooting scene, the frame difference method has poor anti-interference capability on the light source flicker frequency detection, so that the robustness of the detection result is poor.
In another related technology, the light source flicker frequency in a shooting scene can be detected through a device for directly detecting the alternating current light source frequency, but the current scheme is generally designed by matching a single-window detection device, so that the frequency space distribution condition under various light source flicker frequencies cannot be effectively analyzed, the main frequency cannot be effectively decided, the light source flicker phenomenon in different areas cannot be effectively inhibited in a partitioning manner, and the light source flicker elimination result is poor.
Based on one or more problems in the related art, the present disclosure first provides a photographing method, which is specifically described below with reference to a terminal device configured with a photographing apparatus performing the method.
Fig. 3 shows a flowchart of a photographing method in the present exemplary embodiment, which may include the following steps S310 to S340:
in step S310, an ambient light distribution image in a shooting scene is acquired, the ambient light distribution image including at least two image areas.
In an exemplary embodiment, the ambient light distribution image refers to an image formed by ambient light data in a shooting scene acquired by the ambient light collection device, and the field angle of the ambient light collection device may be the same as the field angle of the camera image sensor, that is, the size of the ambient light distribution image may be the same as the size of the image collected by the image sensor, so that it can be ensured that the ambient light data in the ambient light distribution image corresponds to an area in the collected image frame. Of course, the angle of view of the ambient light collection device may also be slightly smaller or slightly larger than the angle of view of the camera image sensor, which is not particularly limited in this exemplary embodiment.
The image area refers to an area divided in the ambient light distribution image, for example, two image areas may be divided in the ambient light distribution image, one is a core area, the core area may be an area within a certain range in the center of the ambient light distribution image, and the other is a non-core area, that is, an image area in the ambient light distribution image except the core area; the environment light distribution image can also be divided into four image areas, namely an upper left corner area, an upper right corner area, a lower left corner area and a lower right corner area; of course, the ambient light distribution image may also be divided into a plurality of image areas by other manners, and the image areas may be specifically divided by self-definition according to the actual application situation, which is not limited in this embodiment.
In step S320, a light source flicker type of each of the image areas is determined from the ambient light distribution image.
In an exemplary embodiment, the light source flicker type refers to a type preset for describing a light source flicker frequency distribution in the image area, for example, the light source flicker type may include a no light source flicker type, a single light source flicker type, and a multiple light source flicker type, where the no light source flicker type may indicate that the light source flicker frequency does not exist in the image area; the single light source flicker type can indicate that a unique type of light source flicker frequency exists in the image area, and if the image area only contains the light source flicker frequency of 60Hz, the image area can be determined to be the single light source flicker type; the multi-light-source flicker type may indicate that multiple types of light source flicker frequencies exist in the image region, and if the image region includes light source flicker frequencies of 60Hz, 100Hz, and 200Hz, it may be determined that the image region is of the multi-light-source flicker type; of course, the light source flashing type may also include other types, and may be specifically set by a user, which is not limited in this embodiment.
The distribution of the light source flicker frequency is set to be different light source flicker types, the distribution mode of the light source flicker frequency in the image area can be rapidly determined, the complex light source shooting scene is convenient to analyze, and the analysis efficiency is effectively improved.
In step S330, a target anti-flicker manner for each of the image areas is determined according to the light source flicker type.
In an exemplary embodiment, the target anti-flicker manner refers to a processing manner for eliminating a light source flicker phenomenon existing in an image area, for example, if the image area is of a type without light source flicker, the target anti-flicker manner of the image area is not processed; if the image area is of a single light source flicker type, setting exposure time by taking the light source flicker frequency of the unique type as the target light source flicker frequency in a target flicker-resistant mode of the image area, and enabling the exposure time to be integral multiple of the light source flicker frequency period in an exposure time adjusting mode so as to eliminate the light source flicker of the unique type; if the image area is of a multi-light-source flicker type, determining a main light source flicker frequency in multiple types of light source flicker frequencies by a target flicker-resistant mode of the image area, setting exposure time by taking the main light source flicker frequency as the target light source flicker frequency, performing global light source flicker elimination on the image area in an exposure time adjustment mode, and then realizing light source flicker elimination on local areas where other types of light source flicker frequencies are located in a multi-frame superposition mode. Of course, the target anti-flicker mode may also be anti-flicker processing in other modes, specifically related to the determined light source flicker type, and may be set by user according to actual needs, which is not particularly limited in this example embodiment.
In step S340, light source flicker elimination is performed on the image frames acquired in the shooting scene based on the target flicker-resistant manner, so as to obtain image frames with light source flicker eliminated.
In an exemplary embodiment, after the light source flicker types of different image areas are determined, a light source flicker elimination strategy, namely a target flicker resistant mode, acting on the image area can be determined according to the light source flicker types, then different light source flicker suppression can be realized on different image areas according to the target flicker resistant modes of the different image areas, the accuracy of a light source flicker elimination result can be effectively improved, and the quality of a camera preview picture or a video shot by a camera in a shooting scene is improved.
Different image areas are set to distinguish different types of light source flicker frequencies in a shooting scene, and anti-flicker processing is respectively carried out, so that light source flicker elimination can be carried out on all light source flicker frequencies existing in the shooting scene, and the accuracy of a processing result is improved; compared with the mode of determining the light source flicker frequency through a frame difference method in the related art, the method can effectively improve the accuracy and the anti-interference performance of the detection result, improve the robustness of the light source flicker elimination result, and ensure the quality of a camera preview picture or a video shot by a camera in the shooting scene.
The following describes steps S310 to S340 in detail.
In an exemplary embodiment, the ambient light distribution image in the shooting scene may be acquired by an ambient light collecting device, where the ambient light collecting device may be an anti-flicker sensor (flickers sensor), and may also be another sensor or device capable of collecting ambient light data, and this exemplary embodiment is not limited thereto.
The method comprises the steps that an environmental light distribution image in a shooting scene can be acquired through a preset multi-window anti-flicker sensor; wherein the multi-window anti-flicker sensor may comprise an anti-flicker sensor array of at least two anti-flicker sensors, the anti-flicker sensor array generating ambient light data having at least two detection window regions corresponding thereto.
Fig. 4 schematically illustrates a schematic diagram of a multi-window anti-flicker sensor for acquiring an ambient light distribution image in an exemplary embodiment of the disclosure.
Referring to fig. 4, the multi-window anti-flicker sensor may include a plurality of anti-flicker sensors 410, where the anti-flicker sensors 410 are spatially arranged according to a preset number of columns and rows to obtain anti-flicker sensors, and specifically, the plurality of anti-flicker sensors 410 may be arranged according to an M × N array to form an anti-flicker sensor array 420, for example, M may be preset to 10, and N may be set to 10, so that the multi-window anti-flicker sensor may include 100 anti-flicker sensors 410, and the 100 anti-flicker sensors 410 are spatially arranged to obtain an anti-flicker sensor array of 10 × 10. Of course, specific M and N may be set by a user according to an actual application scenario, which is not particularly limited in this example embodiment.
When a camera is started in a shooting scene, the multi-window anti-flicker sensor with the M x N anti-flicker sensor array 420 structure is arranged in space, ambient light data in the shooting scene is collected, an ambient light distribution image 440 with M x N detection window regions 430 is obtained, and the ambient light data in each detection window region 430 can reflect light source flicker frequency of various light sources in the shooting scene.
In an exemplary embodiment, the determining the light source flicker type of each image area through the ambient light distribution image may be implemented according to the steps in fig. 5, and as shown in fig. 5, the determining may specifically include:
step S510, obtaining ambient light data corresponding to each detection window region;
step S520, performing fast Fourier transform on the environment light data to obtain light source flicker frequencies corresponding to the detection window areas;
step S530, determining the light source flicker type of the image area according to the light source flicker frequency.
Each image area in the ambient light distribution image may correspond to a plurality of detection window areas, that is, the plurality of detection window areas constitute one image area, and optionally, one detection window area may also serve as one image area, which is not particularly limited in this exemplary embodiment.
The ambient light data refers to sampling signal data acquired by a multi-window anti-flicker sensor through light source signals in a shooting scene, fast Fourier Transform (DFT) is an efficient and Fast calculation method for calculating Discrete Fourier Transform (DFT) by using a computer, the DFT is the most basic method for signal analysis, the core of the DFT is the Fourier Transform, and the signal can be converted from a time domain to a frequency domain through the DFT so as to study the spectrum structure and the change rule of the signal.
The ambient light data (sampling signals) corresponding to the detection window regions can be converted into light source flicker frequencies corresponding to the detection window regions through fast Fourier transform, and then the light source flicker type of the image region can be determined through the light source flicker frequencies corresponding to the detection window regions.
Fig. 6 schematically illustrates a diagram of a light source flicker frequency obtained through ambient light data conversion in an exemplary embodiment of the disclosure.
Referring to fig. 6, the ambient light data corresponding to the detection window regions may be subjected to fast fourier transform, and a data graph 600 corresponding to the light source blinking frequency and the light source blinking frequency intensity corresponding to each detection window region may be output, where the horizontal axis of the data graph 600 may represent the light source blinking frequency, and the vertical axis of the data graph 600 may represent the light source blinking frequency intensity. According to the data diagram 600, it can be determined that the first light source flicker frequency 610 acquired by the detection window region is 100Hz, the corresponding light source flicker frequency intensity is 10500, the acquired second light source flicker frequency 620 is 210Hz, and the corresponding light source flicker frequency intensity is 1800. Based on this, the light source blinking frequency and the light source blinking frequency intensity for each detection window region can be obtained.
Optionally, the light source flashing types in this embodiment may include a no light source flashing type, a single light source flashing type, and a multiple light source flashing type. If the light source flicker frequency does not exist in the image area, determining that the light source flicker type of the image area is a non-light source flicker type; if the unique type of light source flicker frequency exists in the image area, the light source flicker type of the image area can be determined to be a single light source flicker type; if it is determined that a plurality of types of light source flicker frequencies exist in the image area, it may be determined that the light source flicker type of the image area is a multi-light-source flicker type.
In an exemplary embodiment, the target flicker prevention manner may include a first flicker prevention manner, and if it is determined that the light source flicker type of the image area is the single light source flicker type, it may be determined that the light source flicker elimination is performed on the image area by using the first flicker prevention manner.
Specifically, the elimination of the light source flicker in the image area by using the first anti-flicker method may be implemented by the steps in fig. 7, and as shown in fig. 7, the method specifically includes:
step S710, determining a first exposure time corresponding to the image area according to the light source flicker frequency corresponding to the image area, wherein the first exposure time is an integral multiple of the light source flicker frequency period;
and step S720, eliminating the flicker of the light source of the image area through the first exposure time.
When it is determined that only one type of light source flicker frequency exists in the image area, the first exposure time may be determined according to the light source flicker frequency, specifically, the first exposure time may be determined according to a period of the light source flicker frequency, that is, the first exposure time may be set to an integer multiple of the period of the light source flicker frequency, for example, the period of the light source flicker frequency may be 1/50 second, and then the exposure time of the camera may be set to 1/50 second, 1/25 second, 3/50 second, and so on, as long as it is ensured that the first exposure time may be set to an integer multiple of the period of the light source flicker frequency, which is not particularly limited in this example embodiment.
Fig. 8 schematically illustrates a principle diagram of eliminating a flicker phenomenon of a light source through exposure time adjustment in an exemplary embodiment of the present disclosure.
Referring to fig. 8, a flicker frequency of a light source in an image area may be abstracted as periodically distributed vertical bars, time may be represented by a horizontal axis, and a flicker frequency 800 of a light source existing in an image area may be abstracted by a graph. When a camera of the terminal device shoots an image, the light source flicker frequency of the alternating current light source is generally faster than the shutter moving time, that is, the common exposure time 810 of the camera is less than one period of the light source flicker frequency 800, and at this time, an image frame 820 with a light source flicker phenomenon can be shot.
At this time, the exposure time 830 of the camera may be re-determined according to the frequency value of the light source flicker frequency 800, the exposure time 830 may be an integral multiple of the period of the light source flicker frequency, the exposure time 830 in the figure is a period of the light source flicker frequency, and the image frame 840 may be obtained by shooting through the adjusted exposure time 830.
In an exemplary embodiment, the target flicker-resistant manner may include a second flicker-resistant manner, and if it is determined that the light source flicker type of the image area is the multi-light-source flicker type, it may be determined that the second flicker-resistant manner is adopted to perform light source flicker elimination on the image area.
Specifically, the elimination of the light source flicker in the image area by using the second anti-flicker method may be implemented by the steps in fig. 9, and as shown in fig. 9, the method may specifically include:
step S910, determining the main light source flicker frequency corresponding to the image area;
step S920, determining second exposure time according to the main light source flicker frequency, and carrying out global light source flicker elimination on the image area according to the second exposure time; and
step S930, determining that a target detection window region with a light source flicker frequency except for the main light source flicker frequency exists in the image region, and performing multi-frame overlapping processing on image content in the target detection window region to eliminate local light source flicker in the image region.
The main light source flicker frequency refers to a light source flicker frequency with the highest occupation ratio in the image area, for example, the image area may include 10 detection window areas, where 5 detection window areas are provided for a light source flicker frequency of 100Hz, 3 detection window areas are provided for a light source flicker frequency of 200Hz, and 2 detection window areas are provided for a light source flicker frequency of 60Hz, where the occupation ratio of the light source flicker frequency of 100Hz in the image area is the highest, so that the light source flicker frequency of 100Hz may be used as the main light source flicker frequency of the image area.
The second exposure time can be determined according to the main light source flicker frequency, global light source flicker elimination can be further carried out on the image area through the second exposure time, then a target detection window area with the light source flicker frequency except the main light source flicker frequency in the image area is determined, multi-frame superposition processing is carried out on image content in the target detection window area, and local light source flicker elimination of the image area is achieved.
For a shooting scene with multiple light sources, the light source flicker phenomena with different spatial distributions are distinguished and restrained, the second exposure time is determined by the main light source flicker frequency with a high occupation ratio, the overall light source flicker elimination is carried out on an image area, the light source flicker with the most light sources in the image area is preliminarily eliminated, then the light source flicker phenomena with other light source flicker frequencies are eliminated in a multi-frame overlapping mode, the accuracy of a light source flicker elimination result can be effectively improved, and the robustness of the result is improved.
It should be noted that "first" and "second" in "first exposure time" and "second exposure time" in the embodiments of the present disclosure are only used for distinguishing the exposure times in different anti-flicker manners, and do not have any special meaning, and should not cause any special limitation to the present exemplary embodiment.
Specifically, when the light source flicker type of the image area is determined to be the non-light source flicker type, the light source flicker elimination may not be performed on the image area.
In an exemplary embodiment, the at least two image areas may include a core area corresponding to the first detection window area and a non-core area corresponding to the second detection window area; specifically, the light source flicker type of the core region may be determined according to the light source flicker frequency corresponding to the first detection window region; the light source flicker type of the non-core area may be determined according to the light source flicker frequency corresponding to the second detection window area.
Optionally, the core region may be a central region corresponding to the ambient light distribution image, and the non-core region may be an edge region corresponding to the ambient light distribution image, for example, a geometric center of the ambient light distribution image may be used as a central point, a preset geometric shape (such as a rectangle, a circle, etc.) may be used as a region boundary, the central region is determined in the ambient light distribution image, and a region except the central region in the ambient light distribution image may be used as an edge region; of course, the position corresponding to the bright light source of the small area in the environmental light distribution image may also be used as the central point of the central area, so as to ensure that the central area may include the light source that is directly opposite to the camera in the shooting scene, which is not limited to this in this example embodiment.
Fig. 10 schematically illustrates a schematic diagram of a core region and a non-core region in an exemplary embodiment of the disclosure.
Referring to fig. 10, it is assumed that a shooting scene 1010 includes a light source 1011, a light source 1012, a light source 1013, a light source 1014, and a light source 1015 with different light source flicker frequencies, wherein the light source 1011 is a light source facing a camera, so that the light source has a large influence on an imaging process of an image sensor, since the light source flickering frequency generated by the light source 1011 needs to be considered preferentially, the area where the light source 1011 may be facing the camera may be the core area 1021 of the ambient light distribution image 1020, and the areas where other light sources are located may be the non-core areas 1022.
It is to be understood that, although the core area 1021 shown in fig. 10 is a central area determined by the geometric center position of the ambient light distribution image 1020 and the non-core area 1022 is an edge area of the ambient light distribution image 1020, the core area may be a central area determined by determining the position of the light source 1011 facing the camera in the ambient light distribution image 1020; of course, the core area and the non-core area may also be image areas divided in the brightness distribution image in other manners, and this exemplary embodiment is not limited thereto.
Specifically, an ambient light distribution image having a plurality of detection window regions Wij (i =1,2,.. Multidot., m; j =1,2,. Multidot., n) may be acquired by the multi-window anti-flicker sensor, as shown in fig. 10, taking m =8, n =6 as an example, the core region 1021 may correspond to the first detection window region, for example, the first detection window region may include a detection window region W22, a detection window region W23, a detection window region … …, a detection window region W74 and a detection window region W75, and the non-core region 1022 may include a detection window region W11, a detection window region W12, an detection window region … …, a detection window region W85 and a detection window region W86.
By dividing the environment light distribution image into a core area and a non-core area and respectively carrying out light source elimination processing on the core area or the non-core area, the interference of a light source in the non-core area to a light source flicker elimination result in the core area is avoided, the robustness of the light source flicker elimination result is effectively improved, the accuracy of the light source flicker elimination result can be further ensured, and the quality of an image frame after the light source flicker elimination is improved.
Fig. 11 schematically illustrates a flow chart of eliminating a flicker phenomenon of a light source in an exemplary embodiment of the disclosure.
Referring to fig. 11, in step S1110, the multi-window anti-flicker sensor detects ambient light data; an environment light distribution image in a shooting scene can be acquired through a multi-window anti-flicker sensor;
step 1120, counting and analyzing the flicker frequency of the light source; the fast Fourier transform can be carried out on the ambient light data of each detection window area in the ambient light distribution image to obtain the light source flicker frequency;
step S1130, determining whether the image area has a light source flicker frequency, if so, executing step S1140, otherwise, determining that the image area is of a non-light source flicker type, and ending the current process;
step S1140, determining whether the image area has a plurality of types of light source flicker frequencies, if so, determining that the image area is a multi-light source flicker type and executing step S1160, otherwise, determining that the image area is a single-light source flicker type and executing step S1150;
step S1150, adopting an exposure time adjusted anti-flicker manner (global) for a main light source flicker frequency in a scene where there is one type of light source flicker frequency or multiple types of light source flicker frequencies;
step S1160, determining whether the current light source flicker frequency is the main light source flicker frequency, if so, executing step S1150, otherwise, executing step S1170;
step S1170, the detection window areas corresponding to the flicker frequencies of the other light sources except the main light source flicker frequency are subjected to a multi-frame overlapped flicker-resistant mode (local) and the current process is ended.
In summary, in the exemplary embodiment, an ambient light distribution image in a shooting scene may be obtained, where the ambient light distribution image may include at least two image areas, a light source flicker type of each image area is determined through the ambient light distribution image, a target flicker-resistant manner of each image area may be further determined according to the light source flicker type, and finally, light source flicker elimination may be performed on an image frame acquired in the shooting scene based on the target flicker-resistant manner, so as to obtain an image frame after the light source flicker elimination. The method has the advantages that the environmental light distribution image can be divided into at least two image areas, the target anti-flicker mode corresponding to each image area is determined respectively through the determined light source flicker types, and then the corresponding anti-flicker mode can be adopted for the light source flicker distributed at different positions in the shooting scene, so that the light source flicker phenomenon in the multi-light source shooting scene is effectively inhibited, the accuracy of the processing result is improved, and the quality of the camera preview picture or the shooting video picture is improved.
The embodiment of the disclosure obtains the light source flicker frequency data of the regional alternating current light source by introducing the multi-window flicker-resistant sensor device, so that the targeted frequency evaluation and screening can be performed on different image regions, the method can adapt to the complex scenes with various light sources, the light source flicker phenomenon of extremely complex light source scenes can be effectively eliminated or greatly weakened, and a better video picture or a preview picture can be provided.
It is noted that the above-mentioned figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the disclosure and are not intended to be limiting. It will be readily appreciated that the processes illustrated in the above figures are not intended to indicate or limit the temporal order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Further, referring to fig. 12, the embodiment of the present example further provides a camera 1200, which includes an ambient light image obtaining module 1210, a light source flicker type determining module 1220, an anti-flicker mode determining module 1230, and a light source flicker eliminating module 1240. Wherein:
the ambient light image obtaining module 1210 is configured to obtain an ambient light distribution image in a shooting scene, where the ambient light distribution image includes at least two image areas;
the light source flicker type determining module 1220 is configured to determine a light source flicker type of each image region according to the ambient light distribution image;
the anti-flicker mode determining module 1230 is configured to determine a target anti-flicker mode of each image region according to the light source flicker type;
the light source flicker elimination module 1240 is configured to perform light source flicker elimination on the image frames acquired in the shooting scene based on the target flicker-resistant mode, so as to obtain image frames with light source flicker eliminated.
In an exemplary embodiment, the ambient light image acquisition module 1210 may be configured to:
acquiring an environmental light distribution image in a shooting scene through a preset multi-window anti-flicker sensor;
the multi-window anti-flicker sensor comprises an anti-flicker sensor array formed by at least two anti-flicker sensors, and the anti-flicker sensor array is used for generating environment light data corresponding to at least two detection window areas.
In an exemplary embodiment, the light source flicker type determining module 1220 may be configured to:
acquiring ambient light data corresponding to each detection window area;
performing fast Fourier transform on the environment light data to obtain light source flicker frequency corresponding to each detection window area;
and determining the light source flicker type of each image area according to the light source flicker frequency.
In an exemplary embodiment, the light source flicker type determining module 1220 may be configured to:
if the light source flicker frequency does not exist in the image area, determining that the light source flicker type of the image area is a non-light source flicker type;
if the light source flicker frequency of one type exists in the image area, determining that the light source flicker type of the image area is a single light source flicker type;
and if the flicker frequency of the light sources of various types exists in the image area, determining that the flicker type of the light sources in the image area is a multi-light-source flicker type.
In an exemplary embodiment, the light source flicker type determining module 1220 may be configured to:
if the light source flicker type of the image area is a single light source flicker type, determining to adopt a first anti-flicker mode to eliminate the light source flicker of the image area;
and if the light source flicker type of the image area is the multi-light-source flicker type, determining to adopt a second anti-flicker mode to eliminate the light source flicker of the image area.
In an exemplary embodiment, the light source flicker type determining module 1220 may be configured to:
determining a first exposure time corresponding to the image area according to the light source flicker frequency corresponding to the image area, wherein the first exposure time is an integral multiple of the light source flicker frequency period;
and eliminating the flicker of the light source of the image area through the first exposure time.
In an exemplary embodiment, the light source flicker type determination module 1220 may be configured to:
determining the flicker frequency of a main light source corresponding to the image area;
determining second exposure time according to the main light source flicker frequency, and carrying out global light source flicker elimination on the image area through the second exposure time; and
and determining a target detection window area with light source flicker frequency except the main light source flicker frequency in the image area, and performing multi-frame superposition processing on image content in the target detection window area to eliminate local light source flicker in the image area.
In an exemplary embodiment, the at least two image areas may include a core area and a non-core area, the core area may correspond to the first detection window area, and the non-core area may correspond to the second detection window area;
the light source flicker type determination module 1220 may be configured to:
determining the light source flicker type of the core area according to the light source flicker frequency corresponding to the first detection window area;
and determining the light source flicker type of the non-core area according to the light source flicker frequency corresponding to the second detection window area.
In an exemplary embodiment, the core region may include a central region of the ambient light distribution image, and the non-core region may include a peripheral region of the ambient light distribution image.
The specific details of each module in the above apparatus have been described in detail in the method section, and details that are not disclosed may refer to the method section, and thus are not described again.
As will be appreciated by one skilled in the art, aspects of the present disclosure may be embodied as a system, method or program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
Exemplary embodiments of the present disclosure also provide an electronic device. The electronic devices may be the above-described terminal devices 101, 102, 103 and the server 105. In general, the electronic device may include a multi-window anti-flicker sensor for acquiring an ambient light distribution image in a shooting scene, a processor, and a memory for storing executable instructions of the processor, the processor being configured to perform the above-described shooting method via execution of the executable instructions.
The structure of the electronic device will be exemplarily described below by taking the mobile terminal 1300 in fig. 13 as an example. It will be appreciated by those skilled in the art that the configuration in figure 13 can also be applied to fixed type devices, in addition to components specifically intended for mobile purposes.
As shown in fig. 13, the mobile terminal 1300 may specifically include: a processor 1301, a memory 1302, a bus 1303, a mobile communication module 1304, an antenna 1, a wireless communication module 1305, an antenna 2, a display screen 1306, a camera module 1307, an audio module 1308, a power module 1309, and a sensor module 1310.
An encoder may encode (i.e., compress) an image or video to reduce the data size for storage or transmission. The decoder may decode (i.e., decompress) the encoded data for the image or video to recover the image or video data. The mobile terminal 1300 may support one or more encoders and decoders, such as: image formats such as JPEG (Joint Photographic Experts Group), PNG (Portable Network Graphics), BMP (Bitmap), and Video formats such as MPEG (Moving Picture Experts Group) 1, MPEG10, h.1063, h.1064, and HEVC (High Efficiency Video Coding).
The memory 1302 may be used to store computer-executable program code, which includes instructions. The processor 1301 executes various functional applications of the mobile terminal 1300 and data processing by executing instructions stored in the memory 1302. The memory 1302 may also store application data, such as files for storing images, videos, and the like.
The communication function of the mobile terminal 1300 may be implemented by the mobile communication module 1304, the antenna 1, the wireless communication module 1305, the antenna 2, the modem processor, the baseband processor, and the like. The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. The mobile communication module 1304 may provide mobile communication solutions such as 3G, 4G, 5G, etc. applied to the mobile terminal 1300. The wireless communication module 1305 may provide a wireless communication solution such as wireless lan, bluetooth, near field communication, etc. applied to the mobile terminal 1300.
The display 1306 is used to implement display functions such as displaying user interfaces, images, videos, and the like. The camera module 1307 is used to implement a shooting function, such as shooting images, videos, and the like. The audio module 1308 is used for implementing audio functions, such as playing audio, collecting voice, and the like. The power module 1309 is used to implement power management functions, such as charging a battery, supplying power to a device, monitoring a battery status, and the like.
The sensor module 1310 may include one or more sensors for implementing corresponding sensing functions. For example, the sensor module 1310 may include a multi-window anti-flicker sensor for capturing an image of the ambient light distribution in the captured scene upon detecting that the mobile terminal 1300 activates the camera.
Exemplary embodiments of the present disclosure also provide a computer-readable storage medium having stored thereon a program product capable of implementing the above-described method of the present specification. In some possible embodiments, various aspects of the disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to perform the steps according to various exemplary embodiments of the disclosure described in the above-mentioned "exemplary methods" section of this specification, when the program product is run on the terminal device.
It should be noted that the computer readable media shown in the present disclosure may be computer readable signal media or computer readable storage media or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
Furthermore, program code for carrying out operations of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (12)
1. A photographing method, characterized by comprising:
acquiring an ambient light distribution image in a shooting scene, wherein the ambient light distribution image comprises at least two image areas;
determining a light source flicker type of each image area through the environment light distribution image;
determining a target anti-flicker mode of each image area according to the light source flicker type;
and carrying out light source flicker elimination on the image frames collected in the shooting scene based on the target flicker-resistant mode to obtain the image frames with the light source flicker eliminated.
2. The method of claim 1, wherein the obtaining an image of ambient light distribution in a capture scene comprises:
acquiring an environmental light distribution image in a shooting scene through a preset multi-window anti-flicker sensor;
wherein the multi-window anti-flicker sensor comprises an anti-flicker sensor array formed by at least two anti-flicker sensors, the anti-flicker sensor array being configured to generate ambient light data having at least two detection window regions corresponding thereto.
3. The method of claim 2, wherein determining the light source flicker type for each of the image regions from the ambient light distribution image comprises:
acquiring the ambient light data corresponding to each detection window area;
performing fast Fourier transform on the environment light data to obtain light source flicker frequency corresponding to each detection window area;
and determining the light source flicker type of each image area according to the light source flicker frequency.
4. The method of claim 1, wherein the determining the light source flicker type for the image area according to the light source flicker frequency comprises:
if the light source flicker frequency does not exist in the image area, determining that the light source flicker type of the image area is a non-light source flicker type;
if the light source flicker frequency of one type exists in the image area, determining that the light source flicker type of the image area is a single light source flicker type;
and if the flicker frequency of the light sources of multiple types exists in the image area, determining that the flicker type of the light sources in the image area is a multi-light-source flicker type.
5. The method of claim 4, wherein determining the target anti-flicker pattern for each of the image regions according to the light source flicker type comprises:
if the light source flicker type of the image area is a single light source flicker type, determining to adopt a first anti-flicker mode to eliminate the light source flicker of the image area;
and if the light source flicker type of the image area is a multi-light-source flicker type, determining to adopt a second anti-flicker mode to eliminate the light source flicker of the image area.
6. The method of claim 5, wherein the performing light source flicker elimination on the image area in the first flicker resistant manner comprises:
determining a first exposure time corresponding to the image area according to the light source flicker frequency corresponding to the image area, wherein the first exposure time is an integral multiple of the light source flicker frequency period;
and eliminating the flicker of the light source of the image area through the first exposure time.
7. The method of claim 5, wherein the performing light source flicker elimination on the image area by using the second anti-flicker method comprises:
determining the flicker frequency of a main light source corresponding to the image area;
determining second exposure time according to the main light source flicker frequency, and carrying out global light source flicker elimination on the image area through the second exposure time; and
and determining a target detection window area with light source flicker frequency except the main light source flicker frequency in the image area, and performing multi-frame superposition processing on image content in the target detection window area to eliminate local light source flicker in the image area.
8. The method according to any of claims 1 to 7, wherein the at least two image areas comprise a core area and a non-core area, the core area corresponding to a first detection window area and the non-core area corresponding to a second detection window area;
the determining the light source flicker type of each image area according to the light source flicker frequency comprises:
determining the light source flicker type of the core area according to the light source flicker frequency corresponding to the first detection window area;
and determining the light source flicker type of the non-core area according to the light source flicker frequency corresponding to the second detection window area.
9. The method of claim 8, wherein the core region comprises a central region of the ambient light distribution image and the non-core region comprises a marginal region of the ambient light distribution image.
10. A camera, comprising:
the system comprises an ambient light image acquisition module, a light distribution acquisition module and a light distribution acquisition module, wherein the ambient light image acquisition module is used for acquiring an ambient light distribution image in a shooting scene, and the ambient light distribution image comprises at least two image areas;
the light source flicker type determining module is used for determining the light source flicker type of each image area through the environment light distribution image;
the anti-flicker mode determining module is used for determining a target anti-flicker mode of each image area according to the light source flicker type;
and the light source flicker elimination module is used for eliminating light source flicker of the image frames acquired in the shooting scene based on the target flicker-resistant mode to obtain the image frames with the light source flicker eliminated.
11. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 9.
12. An electronic device, comprising:
a multi-window anti-flicker sensor;
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the method of any of claims 1 to 9 via execution of the executable instructions.
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