WO2019174494A1

WO2019174494A1 - Image capture method, device and storage medium

Info

Publication number: WO2019174494A1
Application number: PCT/CN2019/077008
Authority: WO
Inventors: 李飞; 罗义军
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-03-13
Filing date: 2019-03-05
Publication date: 2019-09-19
Also published as: CN108462837B; CN108462837A

Abstract

Disclosed by the present invention are an image capture method, device and storage medium, the method comprising: determining that a camera is capturing a moving picture, and then shortening exposure time; acquiring an output image currently outputted after shortening the exposure time; according to a current image, determining whether capturing in said scenario will cause a stripe effect; according to a detection result, adjusting the exposure time in real time such that a stripe effect is avoided as much as possible for a captured image.

Description

Shooting method, device and storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. 20110020 649, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to, but is not limited to, the field of imaging, and in particular, to a photographing method, device and storage medium.

Background technique

In the related art, the photographing device for the scene of the motion is very demanding, and the key point is that a short exposure time is required to avoid motion blur, and it takes 1/500 s or even shorter exposure time for the sprint basketball badminton and the like. Solidify the movement moment to avoid blurring of the image. The user may shoot outdoors or in the room. The light source in the room may be a DC light source or a low-frequency AC light source. However, in the case of an AC light source, the photos taken during a short exposure time will produce light and dark. Interwoven stripes.

In the related art, the photosensitive component of the mobile phone camera adopts a complementary metal oxide semiconductor (CMOS) image sensor, and the CMOS image sensor usually adopts a progressive scroll exposure method. In brief, the first line is performed first. Exposure, the second line starts to expose after one line time, the third line starts to expose after one line time, and so on until all lines are exposed; the CMOS image sensor is used for image shooting, because the rolling exposure is often visible. Yellow bands or other bands between light and dark appear on the image, which seriously affects the quality and look of the image.

Summary of the invention

In view of this, embodiments of the present invention are expected to provide a photographing method, apparatus, and storage medium, which can avoid banding effects in an image and ensure image quality.

An embodiment of the present invention provides a photographing method, including: determining that an exposure time is shortened in a case where there is motion of a camera photographing screen; acquiring an output image currently output by the camera after shortening the exposure time; determining, according to the output image, Whether there is a banding effect when shooting in the current shooting scene, adjust the exposure time according to the detection result; use the adjusted exposure time to shoot.

The embodiment of the present invention further provides a photographing apparatus, comprising: a determining module configured to reduce an exposure time when the camera photographing screen has motion; and an obtaining module configured to obtain a current output of the camera after the exposing time is shortened The image is output; the adjustment module is configured to determine, according to the output image, whether there is a striping effect in the current shooting scene, and adjust the exposure time according to the detection result; and the executing module is configured to use the adjusted exposure time for shooting.

The embodiment of the present invention further provides a storage medium in which a computer program is stored, wherein the computer program is executed to execute the photographing method provided by the embodiment of the present invention.

The embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program during operation to implement the shooting provided by the embodiment of the present invention. method.

Applying the embodiment of the present invention, determining that the camera captures the motion picture, shortening the exposure time, obtaining the output image of the current output after shortening the exposure time, determining whether the shooting may cause a banding effect according to the current image, according to the detection result. Adjust the exposure time in real time so that the captured image avoids the banding effect as much as possible. The above technical solution solves the problem that the image sensor may appear in the related art when the image sensor is exposed, affecting the image effect, and the striping effect in the image is avoided by adjusting the exposure time to ensure the image quality.

DRAWINGS

1 is a schematic diagram showing the frequency of an alternating current in the related art;

2 is a schematic diagram of the obtained light energy per line exposure time in the related art;

3 is a schematic diagram showing light and dark stripes appearing in an image captured in an AC environment in the related art;

4 is a circuit diagram of a single pixel unit of a CMOS image sensor in the related art;

FIG. 5 is a flowchart of a photographing method according to an embodiment of the present invention; FIG.

6 is a schematic diagram of an image sensor according to an embodiment of the present invention;

7 is a flow chart of a method for reducing blurring of a photograph taken in an embodiment of the present invention;

8 is a flow chart of a strategy for modifying an exposure time according to an embodiment of the present invention;

9 is a schematic diagram of a method for determining an exposure time according to motion detection according to an embodiment of the present invention;

FIG. 10 is a flow chart showing a method of determining an exposure time according to motion detection according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In the research process, the inventor found that in the case of an AC electric light source, the photo of the light and dark interlaced strips produced by the photo taken with too short exposure time is as follows: The photosensitive component of the mobile phone camera is CMOS, and the exposure is performed by the line. Exposure, such that the start and end times of different line exposures in a frame of image are not the same. The frequency of the AC power source has two standards: 50Hz (continental, European) and 60Hz (Taiwan, Japan, the United States) sinusoidal waveform, of course, the energy is not directional, so the corresponding energy is a waveform with a frequency of 100Hz and 120Hz FIG. 1 is a schematic diagram of the frequency of the alternating current in the related art. Referring to FIG. 1 , the corresponding source of the power source in the technical field is described as Sources of Electricity, and the corresponding English in the technical field is described as Dark. The corresponding English in the technical field of flicker bandwidth is described as Flicker band.

In the light source environment using alternating current, if the exposure time is not an integral multiple of 1/2 cycle of the alternating current, the energy of the light obtained in the same exposure time of each row is different, as shown in FIG. 2, FIG. 2 is related art. A schematic diagram of the obtained light energy per exposure time, where 1/80 sec is 1/80 second.

A light and dark stripe appears on the image, as shown in FIG. 3, which is a schematic diagram showing the appearance of light and dark stripes in an image taken under an alternating current scene in the related art.

In the related art, a banding problem occurs in a mass-produced CMOS sensor with a high-brightness AC light source.

An image sensor is a semiconductor device that converts an optical signal into an electrical signal. In the related art, a conventional image sensor includes a charge coupled device (CCD) image sensor and a CMOS image sensor. Due to the advantages of low power consumption and high signal-to-noise ratio, CMOS image sensors are widely used in the field of image sensors.

A single pixel unit circuit of a CMOS image sensor in the related art is shown in FIG. 4. FIG. 4 is a circuit diagram of a single pixel unit of a CMOS image sensor in the related art, as shown in FIG. 4, which mainly includes a photodetector (Pinned) PhotoDiode, PPD), transfer tube T1, reset tube T2, source follower T3, and selection tube T4. The photodetector PPD is a photodiode that generates electric charge from light energy, and accumulates electric charge at point A, and the transfer tube T1 receives an enable/read signal tck at the gate, and carries the charge at A to the floating diffusion region B. The reset transistor T2 is reset by receiving a reset signal rst through its gate, setting the voltages at A and B back to a desired level (such as VDD) and excluding the charge at B. Source follower T3 receives the voltage at B at its gate and thus acts as a source follower, and the gate of select tube T4 receives the row select signal row_sel (which can be generated or executed by other circuitry of the CMOS image sensor), output The voltage from source follower T3.

The above CMOS image sensor employs a progressive scroll exposure method in which the exposure time of all lines is the same although the time at which each line starts to be exposed is different.

Also, cameras made up of CMOS image sensors are often used indoors. In indoor situations, the illumination generally uses 50 Hz AC and fluorescent lamps. Under such lighting conditions, in order to avoid image flicker, the frame time is usually set to be an integer multiple of 10 ms (light intensity change period). However, when the indoor light is relatively strong, the frequency is high, and the exposure time is shorter than 10 ms, yellow bands or other bands of light and dark appear on the image, which seriously affects the image quality and perception.

The technical solution of the present application can be applied to a photographing device, such as a mobile phone, a tablet computer, a video camera, etc., and is of course not limited to the above device.

It should be added that the striping effect of the captured image due to the change of the lighting of the shooting scene is called the striping effect.

An embodiment of the present invention provides a method for photographing the above-mentioned photographing device. FIG. 5 is a flowchart of a photographing method according to an embodiment of the present invention. As shown in FIG. 5, the flow includes the following steps:

Step S502, if it is determined that there is motion in the camera shooting screen, shorten the exposure time;

Step S504, acquiring an output image of the current output of the camera after shortening the exposure time;

Step S506, determining, according to the output image, whether there is a banding effect in the shooting in the current shooting scene, and adjusting the exposure time according to the detection result;

In step S508, shooting is performed using the adjusted exposure time.

Through the above steps, it is determined that the camera captures the motion picture, the exposure time is shortened, the output image of the current output after the exposure time is shortened, and whether the shooting effect is caused in the scene according to the current image is determined, and the detection result is adjusted in real time according to the detection result. The exposure time allows the captured image to avoid the banding effect as much as possible. The above technical solution solves the problem that the image sensor may appear in the related art when the image sensor is exposed, affecting the image effect, and the striping effect in the image is avoided by adjusting the exposure time to ensure the image quality.

It should be added that the striping effect of the captured image due to the change of the lighting of the shooting scene may be referred to as a striping effect.

In an embodiment, determining, according to the output image, whether there is a striping effect in the current shooting scene, comprising: determining a light source type in a current shooting environment according to the output image; determining, according to the light source type, the current shooting scene Take a shot to see if there is a banding effect.

In an embodiment, adjusting the exposure time according to the detection result, including one of the following: determining that the light source type of the current shooting scene is a 50 Hz or 60 Hz light source, adjusting the exposure time to be an integer multiple of a half cycle; determining the current shooting scene In the case where the light source type is a DC flicker free light source, the exposure time is shortened.

In an embodiment, adjusting the exposure time according to the detection result includes one of: increasing the exposure time in the case where it is determined that the output image has a strip effect; and reducing the exposure in the case where it is determined that the output image does not have a strip effect time.

In an embodiment, after determining that there is motion in the camera shooting screen, after the exposure time is shortened, the method further includes: acquiring a second output image output by the camera; determining, in the case that the strip effect is currently present, according to the second output image. Extending the current second exposure time to 1/120 s, wherein the second exposure time is less than 1/120 s.

In an embodiment, before extending the exposure time to 1/120 s, it is determined whether there is a conditional extension of the exposure time to 1/120 s: obtaining K1=(1/120)/S1; in the case of G1>=K1 Determine to conditionally extend the exposure time to 1/120 s; where S1 represents the current exposure time and G1 represents the current sensitivity.

In an embodiment, after extending the exposure time to 1/120 s, the method further comprises: acquiring a third output image output by the camera; and determining, in the case that the strip effect is currently present, according to the third output image, extending the exposure time to 1/100s.

In an embodiment, before the exposure time is extended to 1/100 s, the method further comprises: determining whether the condition is extended by the following method to 1/100 s: obtaining K1=(1/100)/S1; at G1>= In the case of K1, it is determined that the exposure time is conditionally extended to 1/100 s; wherein S1 represents the current exposure time and G1 represents the current sensitivity.

In an embodiment, after extending the exposure time to 1/100 s, the method further comprises: acquiring a fourth output image output by the camera; and determining, according to the fourth output image, that the current strip effect is present, adjusting the exposure time to The second exposure time, or the extended exposure time, is greater than 1/100 s.

In an embodiment, the extended exposure time is greater than 1/100 s, including: adjusting the exposure time to S1*G1, wherein S1 represents the exposure time before the current adjustment, and G1 represents the sensitivity before the current adjustment.

In an embodiment, an exposure control method for a CMOS image sensor includes: performing a first progressive exposure and a second progressive exposure on a pixel array to obtain first image data and second image data, wherein The exposure time interval of the same row in the first progressive exposure and the second progressive exposure is an odd multiple of a half intensity variation period; the first image data is combined with the image data located in the same row in the second image data to The output image is derived. In an embodiment, the step of respectively performing the first progressive exposure and the second progressive exposure on the pixel array to obtain the first image data and the second image data comprises: performing a first row-by-line exposure on the pixel array to Deriving first image data; performing a second progressive exposure on the pixel array in the same exposure sequence as the first progressive exposure to obtain second image data; a start time of the first progressive exposure and a second The start time interval of the line exposure is an odd multiple of half the intensity change period.

The technical solution of the above reference file solves the stripe problem and has the following defects:

1. The sensor sensor needs precise exposure synchronization control, the cost process is increased, and the feasibility is not good.

2. At present, there is no usable product for mass production sensor, and there must be a more realistic solution.

In order to solve the related art, the short exposure time is required for the motion photography, and the shorter exposure time has the contradiction of the strips in the image under the low frequency alternating current light source, thereby realizing the automatic identification of the light source and obtaining better in the environment without the strip light source. The motion picture effect, the method steps of the embodiment of the present invention are as follows:

Step 1. Identify if the light source will cause a banding effect.

Step 2. Determine whether there is a limit to shorten the exposure time for the above judgment result.

Step 3. According to step 2, if the image does not produce a stripe light source scene, shorten the exposure time, and no banding effect limits the exposure time to take a better picture.

In addition, in step 3, according to step 2, if it is a 50 Hz or 60 Hz scene, the exposure time is shortened, and the exposure time must be an integral multiple of 1/100 s or 1/120 s.

In addition, an implementation method includes the following steps:

Step 1. Use the shortest exposure time to image according to the shooting scene

Step 2. Determine whether the image has a banding effect under this exposure time condition.

Step 3. According to step 2, if the image does not produce a banding effect, maintain this exposure time imaging

Step 4. According to step 2, if the image produces a banding effect, the exposure time is extended. Under certain conditions, try to extend the exposure time to an integral multiple of 1/100s or 1/120s respectively to see if there is a banding phenomenon. If one of the exposure times causes the image to have no banding effect, select the corresponding exposure time to image.

The embodiments of the present invention can be applied to an outdoor indoor scene, including an indoor and outdoor natural artificial light source environment. In the artificial light source environment, it can be various types of lights, such as: fluorescent lamp, incandescent lamp, 400W metal halide lamp, LED high-power energy-saving lamp, high-frequency electrodeless lamp, T5 energy-saving lamp stadium row lamp, spiral U-shaped high-power energy-saving lamp 6U-60W high-frequency energy-saving lamps, these lights may be powered by DC power, no illuminating lights, may be high-frequency lights, or directly powered by 50hz, 60hz, with obvious periodicity.

6 is a schematic diagram of an image sensor according to an embodiment of the present invention, as shown in FIG. 6, including the following parts:

The sensor included in the camera module is an input unit of the image, and the image optical signal is converted into an electrical signal by the photoelectric conversion principle, and transmitted to the back end processing. The sensor used in the mobile phone of the related art is a CMOS sensor, which adopts a line exposure mode, and the start time of each line of exposure in one frame is different.

The image processor is responsible for receiving the original image information input by the module, and working through the modules of image correction and color correction on various raw fields and yuv fields, and the original image processing is an image that is substantially consistent with the human eye. Different image processors will have a slight difference.

The strip effect detection module is responsible for detecting the type of the light source and identifying whether the current scene light source will cause a banding effect. For example, if the ambient light source is a 50 hz light source, the output result is a 50 hz light source, and if the ambient light source is a 60 hz light source, the output result is It is a 60hz light source. If other sources such as DC flicker-free light source, the output is a flicker-free light source.

The control unit controls the camera senor to adopt different exposure times according to the result of the strip effect detection module. For example, the result of the strip effect detection module is a 50 hz light source. Then modify the current exposure time to an integral multiple of 10ms. If the result is a DC flicker-free light source, the exposure time is shortened, for example, shortened to 1/2 based on the current exposure time or changed to 5 ms if the exposure time is longer than 5 ms.

FIG. 7 is a flowchart of a method for reducing blurring of a photograph taken according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

Step S701: The user turns on the camera.

Step S702: The camera module (sensor) outputs an image.

Step S703: Striping effect check.

Responsible for detecting the type of light source, identifying whether the current scene light source will cause banding effect. For example, if the ambient light source is a 50hz light source, the output result is a 50hz light source. If the ambient light source is a 60hz light source, the output result is a 60hz light source, such as other If the DC has no flickering light source, the output is a flicker free light source.

Decision S704: determining whether there is a striping effect, if there is an execution step 705; otherwise, performing step 706.

It is judged whether the image output by the sensor under the current light source environment may have a banding effect.

Step S705: The exposure time is changed to be an integral multiple of the half cycle of the light source.

If there is a possible band effect, the exposure time is modified according to different light source characteristics, such as a 50hz light source. If the current exposure time is not an integer multiple of 10 ms, the current exposure time is modified to be an integer multiple of 10 ms. If the result is a 60hz light source, it is similarly processed.

Step S706: shortening the exposure time according to the strategy.

If it is not possible to have a light source with a effect, such as a DC flicker-free light source, the strategy can be a simple strategy to change the exposure time according to the strategy to shorten the exposure time, for example, shortening to 1/2 based on the current exposure time or if the exposure time is longer than 5ms will be changed to 5ms. It can also be a relatively complex strategy.

The strategy for adjusting the exposure time may be to select a change according to the ambient brightness. FIG. 8 is a flowchart of a strategy for modifying the exposure time according to the embodiment of the present invention. As shown in FIG. 8, the method includes the following steps:

In step 1, the current brightness is obtained.

In practical applications, the current brightness information can be characterized by the exposure index of the current exposure table.

Step 2 converts to the exposure time and the sensitivity of the camera module.

Here, the exposure time and the sensor gain of the camera module can be correspondingly obtained through the exposure index.

In step 3, the exposure time after the final conversion is confirmed based on the sensitivity value and the exposure time.

Here, the exposure time after the final conversion is confirmed based on the gain value and the exposure time. For the same illumination scene of sensor, different exposure time and gain matching imaging noise will be different. You can choose a trade-off between exposure time and gain. For example, when the exposure time is 0.01s, the maximum gain can be set to 6 times. When the exposure time is 0.005 s, the gain can be set to 4 times or so.

The exposure time modification strategy may also be to select a change according to the moving object detection. FIG. 9 is a schematic diagram of a first method for determining an exposure time according to motion detection according to a preferred embodiment of the present invention. As shown in FIG. 9, the method includes the following steps:

In step 1, the motion detection is performed, and it is determined whether there is motion, and if so, step 3 is performed, otherwise step 2 is performed.

For the current scene motion detection, the motion detection algorithm can use the inter-frame image comparison method in the related art to simply calculate the pixel difference between two frames, or perform inter-frame feature point matching to identify the inter-frame object movement information, and whether there is motion.

Step 2, keep the exposure time unchanged.

Step 3, shorten the exposure time.

Here, if there is motion, the exposure time is increased by gain to reduce the image motion blur effect.

FIG. 10 is a schematic flowchart of a method for determining an exposure time according to motion detection according to an embodiment of the present invention. As shown in FIG. 10, the method flow includes the following steps:

Step 1. Select the shortest exposure time imaging according to the current scene.

In the case where motion is detected in the current scene, imaging is performed using the shortest exposure time.

In step 2, it is determined whether there is a strip, if it exists, step 4 is performed; otherwise, step 3 is performed.

It is judged whether or not the image has a banding effect under this exposure time condition.

Step 3, keep the exposure time unchanged.

This exposure time is imaged if the image does not produce a banding effect.

Step 4, according to the sensitivity value, extend the exposure time to 1/120 s.

If the image produces a banding effect, this exposure time is maintained. See if there are conditions to try to extend the exposure time to 1/120s, as follows:

Current exposure time S1, current gain is G1.

K1=(1/120)/S1

Compare K1 and G1. If G1>=K1, it means that the exposure time is extended to 1/120s under conditions, and the gain value is set to G1/K1.

In step 5, it is judged whether there is a strip, and if it is, step 6 is performed; otherwise, the integral time of the exposure time of 1/120 s is kept unchanged.

According to step 4, try to extend the exposure time to 1/120s, and judge whether the image has a banding effect under the exposure time condition, if the image does not produce a banding effect to maintain the exposure time imaging;

Step 6. Extend the exposure time to 1/100s.

According to step 4, if the image produces a striping effect to see if there is a condition to try to extend the exposure time to 1/100s, the method is as follows:

Current exposure time S1, current gain is G1.

K1=(1/100)/S1

Comparing K1 and G1, if G1>=K1, it means that under the condition, try to extend the exposure time to 1/100s, and the gain value is set to G1/K1.

In step 7, it is judged whether there is a strip, and if it is, step 8 is performed; otherwise, the integral time of the exposure time of 1/120 s is kept unchanged.

According to step 6, the exposure time is extended to 1/100 s, and it is judged whether the image has a banding effect under the exposure time condition, and the image is maintained if the image does not produce a banding effect.

Step 8. Use the initial exposure time or the exposure time as long as possible.

According to step 6, the exposure time is extended to 1/100 s. If the image is strip effect, the initial exposure time imaging can be maintained, or the exposure time can be as long as possible to make the banding phenomenon as unobtrusive as possible. The method is as follows: the current exposure time S1, the current gain is G1., the change gain value is 1 times gain, and the exposure time is extended to S1*G1.

By adopting the above technical solution, it is possible to ensure that the exposure time is improved in the scene without the banding effect, the moving object to be photographed is more clear, the motion blur is reduced, and the maximum possible possibility is not generated in the scene with the banding effect. Striping effect.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in a form of a software product stored in a storage medium (such as a read-only memory (Read- Only Memory, ROM) / Random Access Memory (RAM), disk, CD-ROM, including a number of instructions to enable a terminal device (can be a mobile phone, computer, server, or network device, etc.) The method described in the embodiments of the present invention.

The embodiment of the invention further provides a camera device, which is configured to implement the above-mentioned embodiments, and details have been omitted for description. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable.

In an embodiment, the photographing apparatus of the embodiment of the invention includes:

Determining a module configured to reduce exposure time in the case where there is motion in the camera shooting screen;

Obtaining a module configured to obtain an output image of a current output of the camera after shortening the exposure time;

The adjusting module is configured to determine, according to the output image, whether there is a banding effect in the current shooting scene, and adjust the exposure time according to the detection result;

The execution module is configured to shoot with the adjusted exposure time.

In an embodiment, the adjusting module is further configured to determine, according to the output image, a light source type in a current shooting environment; and determine, according to the light source type, whether a striping effect is performed in the current shooting scene.

In an embodiment, the adjusting module adjusts the exposure time according to the detection result, including one of the following: determining that the light source type of the current shooting scene is a 50 Hz or 60 Hz light source, and adjusting the exposure time to be an integer multiple of a half cycle; In the case where it is determined that the light source type of the current shooting scene is a DC flicker-free light source, the exposure time is shortened.

In an embodiment, the adjusting module adjusts the exposure time according to the detection result, including one of: increasing the exposure time in the case of determining that the output image has a striping effect; determining that the output image does not have a striping effect In case of reduction, the exposure time is reduced.

In an embodiment, in a case where it is determined that there is motion in the camera shooting screen, after the exposure time is shortened, the determining module is further configured to acquire a second output image output by the camera; and determine a current existing strip according to the second output image. In the case of an effect, the current second exposure time is extended to 1/120 s, wherein the second exposure time is less than 1/120 s.

In an embodiment, before the exposing the exposure time to 1/120 s, the determining module is further configured to determine whether to conditionally extend the exposure time to 1/120 s by: obtaining K1=(1/120)/S1 In the case of G1>=K1, it is determined that the exposure time is conditionally extended to 1/120 s; wherein S1 represents the current exposure time and G1 represents the current sensitivity gain.

In an embodiment, after the exposing the exposure time to 1/120 s, the determining module is further configured to acquire a third output image output by the camera; and determine, in the case that the strip effect is currently present, according to the third output image. , extend the exposure time to 1/100s.

In an embodiment, before the exposure time is extended to 1/100 s, the determining module is further configured to determine whether to conditionally extend the exposure time to 1/100 s by: obtaining K1=(1/100)/S1; In the case of G1>=K1, it is determined that the exposure time is conditionally extended to 1/100 s; wherein, S1 represents the current exposure time, and G1 represents the current sensitivity gain.

In an embodiment, after the exposing the exposure time to 1/100 s, the determining module is further configured to acquire a fourth output image output by the camera; and determining, according to the fourth output image, that the current banding effect exists The exposure time is adjusted to be the second exposure time, or the exposure time is extended by more than 1/100 s.

In an embodiment, the determining module is further configured to adjust the exposure time to S1*G1, wherein S1 represents an exposure time before the current adjustment, and G1 represents a sensitivity gain before the current adjustment.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

The embodiment of the present invention further provides a storage medium, wherein the storage medium stores a computer program, wherein the computer program is configured to execute the photographing method described in any one of the above embodiments.

An embodiment of the present invention further provides an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform any of the above embodiments. The shooting method described.

Obviously, those skilled in the art should understand that the above modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. On a network, in an embodiment, they may be implemented by program code executable by a computing device such that they may be stored in a storage device by a computing device and, in some cases, may be different The steps shown or described herein are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A method of shooting, including:

When it is determined that there is motion in the camera shooting screen, the exposure time is shortened;

Obtaining an output image of the current output of the camera after shortening the exposure time;

Determining, according to the output image, whether there is a banding effect in the current shooting scene, and adjusting the exposure time according to the detection result;

Shoot with the adjusted exposure time.
The method according to claim 1, wherein determining whether there is a banding effect in the current shooting scene according to the output image comprises:

Determining a type of light source in a current shooting environment according to the output image;

According to the type of the light source, it is determined whether there is a banding effect when shooting in the current shooting scene.
The method according to claim 2, wherein the exposure time is adjusted according to the detection result, including one of the following:

When it is determined that the light source type of the current shooting scene is a 50 Hz or 60 Hz light source, the exposure time is adjusted to be an integral multiple of a half cycle;

In the case where it is determined that the light source type of the current shooting scene is a DC flicker-free light source, the exposure time is shortened.
The method according to claim 1, wherein the adjusting the exposure time according to the detection result comprises one of the following:

In the case of determining that the output image has a striping effect, increasing the exposure time;

In the case where it is determined that the output image does not have a banding effect, the exposure time is reduced.
The method according to claim 1, wherein, after determining that there is motion in the camera shooting screen, after the exposure time is shortened, the method further includes:

Obtaining a second output image of the camera output;

The current second exposure time is extended to 1/120 s in the case where it is determined that the current band effect is present according to the second output image, wherein the second exposure time is less than 1/120 s.
The method according to claim 5, wherein before the exposing the exposure time to 1/120 s, the method further comprises: determining whether the exposure time is extended to 1/120 s by the following means:

Get K1=(1/120)/S1;

In the case of G1>=K1, it is determined that the exposure time is extended to 1/120 s;

Among them, S1 represents the current exposure time, and G1 represents the current sensitivity.
The method of claim 5, wherein after the exposing the exposure time to 1/120 s, the method further comprises:

Obtaining a third output image of the camera output;

In the case where it is determined that the current banding effect exists according to the third output image, the exposure time is extended to 1/100 s.
The method according to claim 7, wherein the method further comprises: determining whether the condition is extended by the following method to 1/100 s by extending the exposure time to 1/100 s:

Get K1=(1/100)/S1;

In the case of G1>=K1, it is determined that the exposure time is extended to 1/100 s;

Among them, S1 represents the current exposure time, and G1 represents the current sensitivity.
The method of claim 7, wherein after extending the exposure time to 1/100 s, the method further comprises:

Obtaining a fourth output image of the camera output;

In the case where it is determined that the strip effect is currently present according to the fourth output image, the exposure time is adjusted to be the second exposure time, or the exposure time is extended by more than 1/100 s.
The method of claim 7 wherein extending the exposure time by more than 1/100 s comprises:

Adjust the exposure time to S1*G1, where S1 represents the exposure time before this adjustment, and G1 represents the sensitivity before this adjustment.
A photographing device comprising:

Determining a module configured to reduce exposure time in the case where there is motion in the camera shooting screen;

Obtaining a module configured to obtain an output image of a current output of the camera after shortening the exposure time;

The adjusting module is configured to determine, according to the output image, whether there is a banding effect in the current shooting scene, and adjust the exposure time according to the detection result;

The execution module is configured to shoot with the adjusted exposure time.
A storage medium having stored therein a computer program, wherein the computer program is arranged to execute the method of any one of claims 1 to 10 at runtime.
An electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor being arranged to execute the computer program to perform the method of any one of claims 1 to 10 method.