WO2018010411A1

WO2018010411A1 - Photographing method and terminal

Info

Publication number: WO2018010411A1
Application number: PCT/CN2017/071443
Authority: WO
Inventors: 胡文迪; 李飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-07-11
Filing date: 2017-01-17
Publication date: 2018-01-18
Also published as: CN107613190B; CN107613190A

Abstract

Disclosed in embodiments of the present invention are a photographing method and terminal, the method comprising: when there is jitter while photographing, using speed information of the prior image frame to obtain a current frame jitter speed; using current frame imaging parameter information to obtain a current frame jitter motion threshold value; the imaging parameter information comprises: imaging sensor pixel width, object distance and image distance; according to the current frame jitter speed and the current frame jitter motion threshold value, calculating a current frame exposure time threshold value; adjusting actual exposure time of the current frame according to the current frame exposure time threshold value.

Description

Photographing method and terminal

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a photographing method and a terminal.

Background technique

With the popularity of mobile phones such as smartphones and tablets, the camera function that comes with it has a very high usage rate in daily social life. When taking pictures with a mobile terminal, it is often exposed to overexposure or underexposure, so that the image obtained is too bright or too dark. In addition, when the camera is photographed, it is easy to take a blurred image, so by automatically adjusting the exposure time, obtaining a high-quality image within the allowable jitter range becomes an urgent problem to be solved.

In the related art, according to the light intensity value of the current environment, the exposure time required for shooting is acquired, and the target displacement value of the terminal movement is acquired, and if the target displacement value does not exceed the preset displacement value, the shooting operation is performed. However, the related art determines whether or not the shooting operation is performed based on whether the target displacement value exceeds the preset displacement value, so that the shooting may be unsuccessful during the shooting process, and the user needs to adjust the stability when taking the picture.

Summary of the invention

The embodiment of the present invention is intended to provide a photographing method and a terminal to obtain a high-quality image in the case where the photographing is shaken, at least by automatically adjusting the exposure time during photographing, and to prevent blurring of the image due to the shake.

According to an embodiment of the present invention, a photographing method is provided, the method comprising:

Obtaining the jitter speed of the current frame by using the velocity information of the image of the previous frame when the camera shakes;

Acquiring, by using the imaging parameter information of the current frame, a jitter displacement threshold of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor;

Calculating an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame;

Adjusting an actual exposure time of the current frame according to an exposure time threshold of the current frame.

Optionally, the obtaining the jitter speed of the current frame by using the speed information of the image of the previous frame when the camera shakes, includes:

Obtaining a horizontal acceleration and a vertical acceleration of the image of the previous frame;

Calculating an average speed of the image of the previous frame according to the horizontal acceleration and the vertical acceleration; wherein an average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed;

Calculating a jitter speed of the current frame according to an average speed of the image of the previous frame.

Optionally, the acquiring, by using the imaging parameter information of the current frame, the jitter displacement threshold of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor, including:

Obtaining an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor;

And calculating a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.

Optionally, the adjusting an actual exposure time of the current frame according to an exposure time threshold of the current frame includes:

Obtaining a built-in exposure time of the current frame calculated by the automatic exposure control;

When the built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame, setting an actual exposure time of the current frame to a built-in exposure time of the current frame;

When the built-in exposure time of the current frame is greater than the exposure time threshold of the current frame, the actual exposure time of the current frame is set to an exposure time threshold of the current frame.

Optionally, after the setting the actual exposure time of the current frame to the exposure time threshold of the current frame, the method further includes:

If the actual exposure time of the current frame is set to the exposure time threshold of the current frame, the sensitivity of the current frame is increased to supplement the brightness of the current frame according to the actual exposure time of the current frame. .

According to another embodiment of the present invention, a camera terminal is provided, and the terminal includes: obtaining Taking a module, a calculation module, and an adjustment module; wherein

The acquiring module is configured to obtain a jitter speed of the current frame by using speed information of the image of the previous frame when the camera shakes;

And acquiring, by using the imaging parameter information of the current frame, a jitter displacement threshold value of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor;

The calculating module is configured to calculate an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame;

The adjusting module is configured to adjust an actual exposure time of the current frame according to an exposure time threshold of the current frame.

Optionally, the acquiring module is configured to acquire a horizontal acceleration and a vertical acceleration of the image of the previous frame;

The calculation module is configured to calculate an average speed of the image of the previous frame according to the horizontal acceleration and the vertical acceleration; wherein an average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed;

And calculating a jitter speed of the current frame according to an average speed of the image of the previous frame.

Optionally, the acquiring module is configured to obtain an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor;

The calculating module is configured to calculate a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.

Optionally, the terminal further includes: a setting module; wherein

The acquiring module is configured to acquire a built-in exposure time of the current frame calculated by the automatic exposure control;

The setting module is configured to set an actual exposure time of the current frame to a built-in exposure time of the current frame when a built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame;

And when the built-in exposure time of the current frame is greater than an exposure time threshold of the current frame When the value is set, the actual exposure time of the current frame is set to the exposure time threshold of the current frame.

Optionally, the adjusting module is configured to: if the actual exposure time of the current frame is set to an exposure time threshold of the current frame, increase the current frame according to an actual exposure time of the current frame. The sensitivity gain complements the brightness of the current frame.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

The embodiment of the invention provides a photographing method and a terminal, which use the speed information of the previous frame to obtain the jitter speed of the current frame, and then obtain the jitter shift threshold value of the current frame according to the imaging information of the current frame, combined with the jitter speed of the current frame. And the jitter threshold of the current frame, calculate the exposure time threshold of the current frame, and finally adjust the actual exposure time of the current frame according to the exposure time threshold of the current frame, within the jitter range of the guaranteed image quality, The automatic adjustment of the exposure time ensures the sharpness of the image obtained in the case of camera shake.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic flowchart of a photographing method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a method for acquiring a jitter rate of a current frame according to Embodiment 1 of the present invention;

3 is a schematic flowchart of a method for acquiring a jitter displacement threshold value of a current frame according to Embodiment 1 of the present invention;

4 is a schematic diagram of an imaging model according to Embodiment 1 of the present invention;

FIG. 5 is a schematic flowchart of a method for adjusting an actual exposure time of a current frame according to Embodiment 1 of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a camera terminal according to Embodiment 2 of the present invention;

FIG. 7 is a schematic structural diagram of another camera terminal according to Embodiment 2 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.

Embodiment 1

Referring to FIG. 1 , an embodiment of the present invention provides a photographing method, and the method may include:

S101. Obtain a jitter speed of the current frame by using speed information of the image of the previous frame when the camera shakes.

Specifically, referring to FIG. 2, step S101 may include steps S1011 to S1013:

S1011: Acquire a horizontal acceleration and a vertical acceleration of the image of the previous frame.

Specifically, the acceleration a _{x in the} horizontal direction of the plane where the screen is taken and the acceleration a _{y in the} vertical direction can be directly obtained by using the acceleration sensor, the gyroscope, the geomagnetic sensor, and the like which are provided by the mobile terminal. The time of each frame of the image in the process of photographing, that is, the time of the single-frame image is T _f .

S1012: Calculate an average speed of the image of the previous frame according to the horizontal acceleration and the vertical acceleration; wherein an average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed.

Understandably, by integrating the horizontal acceleration and the vertical acceleration in a single frame time, The values of the horizontal average speed and the vertical average speed are respectively determined.

The average horizontal velocity of the image of the previous frame can be obtained by equation (1):

The average vertical velocity of the image of the previous frame can be obtained by equation (2):

From the above equations (1) and (2), the average speed of the image of the previous frame can be obtained, and the jitter speed of the current exposure time can be predicted from the average speed.

S1013. Calculate a jitter speed of the current frame according to an average speed of the image of the previous frame.

The jitter speed of the current frame is the motion speed generated by the mobile terminal when the current exposure time is jittered.

It can be seen from the above step S1012 that the jitter speed of the current frame can be predicted by using the average speed of the image of the previous frame at the current exposure time. Specifically, the jitter speed of the current frame can be obtained by Equation (3):

Exemplarily, the mobile phone user takes a picture of the target object in the indoor environment. Since the moment of the current exposure to generate the image is shaken, the screen generates a displacement data. At this time, the motion of the mobile phone when the displacement occurs can be calculated according to the above method. The jitter speed is calculated to be 0.05 m/s.

S102. Acquire, by using imaging parameter information of the current frame, a jitter displacement threshold value of the current frame. The imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor.

Specifically, referring to FIG. 3, step S102 may include steps S1021 and S1022:

S1021: Obtain an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor.

To make the image taken at the current exposure time, that is, the current frame is not blurred, the imaging displacement threshold of the current frame needs to be within the circle of confusion. The circle of confusion refers to the object image when it is imaged due to aberrations. The imaging beam cannot be concentrated at one point, and a diffused circular projection formed on the image plane, as shown in Fig. 4, the vertical vertical arrow on the left side in Fig. 4 is the schematic of the object being photographed, and the right side is vertical. The inverted hollow arrow is an illustration of the image of the object being photographed, and the distance between the uppermost end and the lowermost end of the inverted inverted arrow shows the diameter d of the circle of confusion, which indicates the range of jitter allowed by the circle of confusion, that is, the dispersion at the time of shooting. Jitter within the circle diameter d, the current frame will not cause blurring.

The imaging displacement threshold of the current frame corresponds to the width of the mobile terminal for 2 pixels of its imaging sensor, so the imaging displacement threshold of the current frame can be obtained by equation (4):

S _v = 2 × pixel_size (4)

Exemplarily, if the width of one pixel in the current mode is 1.0 um, the imaging displacement threshold of the current frame is S _v = 2 × 1.0 um = 2 × 10 ^-6 m.

S1022: Calculate a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.

According to the focus information, the object distance U and the image distance L can be obtained, and the jitter displacement threshold value of the current frame can be obtained by the equation (5):

S _u =(U/L)×S _v (5)

Wherein, as shown in FIG. 4, the object distance refers to the distance from the object to the optical center of the lens, that is, the distance between the plane of the object and the front surface of the lens; the image distance is the distance between the image and the optical center of the lens.

The jitter displacement threshold value of the current frame is the maximum amount of jitter displacement allowed by the mobile terminal when the jitter occurs in the case where the captured image is not blurred.

Exemplarily, if the object distance of the currently photographed target object is 2 m and the image distance is 4 mm or 0.004 m, the imaging displacement threshold value S _v of the current frame obtained in the above step S1021 is 2×10 ^-6 m, The jitter displacement threshold value of the current frame can be obtained as S _u = (2/0.004) × 2 × 10 ^-6 = 0.001 m.

S103. Calculate an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame.

The exposure time threshold of the current frame is to maintain image clarity in the presence of jitter The maximum exposure time. Exceeding this maximum exposure time may result in a deterioration in image quality or an unclear image.

The exposure time threshold T of the current frame can be obtained by equation (6):

T=S _u /V (6)

Exemplarily, the value of the jitter velocity V of the current frame obtained according to the above steps S1013 and S1022 is 0.05 m/s and the jitter displacement threshold S _u of the current frame is 0.001 m, and the exposure time of the current frame can be obtained. The threshold value T is T = S _{u /} V = 0.001 / 0.05 = 0.02 = 1 / 50 s.

S104. Adjust an actual exposure time of the current frame according to an exposure time threshold of the current frame.

Specifically, referring to FIG. 5, step S104 may include steps S1041 to S1043:

S1041: Acquire a built-in exposure time of the current frame calculated by the automatic exposure control.

It should be noted that the built-in exposure time t of the current frame can be calculated according to Automatic Exposure Control (AEC). Auto exposure is the default setting for many digital cameras. In this exposure mode, the camera automatically controls the exposure. The user does not need to do anything. The sensor on the camera automatically sets the aperture value and shutter speed according to the intensity of the light reflected from the scene. The automatic exposure control is mainly used to adjust the overall brightness of the scene. If the subject is too faint, the exposure compensation scale can be adjusted to increase the brightness.

The built-in exposure time of the current frame calculated by the AEC refers to the exposure time required for the current frame calculated by the AEC inside the mobile terminal in the current shooting mode and the shooting scene.

S1042: When the built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame, set an actual exposure time of the current frame to a built-in exposure time of the current frame.

It can be understood that if the built-in exposure time of the current frame is less than or equal to the exposure time threshold of the current frame, it indicates that the exposure time built in the current frame is suitable for the shooting of the current frame, so it is not necessary to adjust it and directly utilize The exposure time built in the current frame calculated by the AEC is exposed as the actual exposure time of the current frame.

The actual exposure time of the current frame refers to the exposure time actually used at the time of capturing the current frame.

S1043. When the built-in exposure time of the current frame is greater than an exposure time threshold of the current frame, setting an actual exposure time of the current frame to an exposure time threshold of the current frame.

It can be understood that if the built-in exposure time of the current frame is greater than the exposure time threshold of the current frame, it means that the exposure time of acquiring the unblurred image in the current jitter situation needs to be maintained at the exposure time threshold of the current frame. Inside to ensure the quality of the captured image. Therefore, it is adjusted to take the exposure time threshold of the current frame as the actual exposure time of the current frame.

Exemplarily, if the current frame built-in exposure time t calculated according to the automatic exposure control is 1/30 s, the exposure time threshold T of the current frame calculated in combination with the above step S103 is 1/50 s, since t>T, Exposure is performed by setting the actual exposure time of the current frame to 1/50 s.

After step S1043, the method further includes:

It should be noted that the ISO is the International Organization for Standardization, which stipulates the sensitivity of the film/image sensor to brightness, and improves the sensitivity of the current frame (ISO, International Organization for Standardization) for the brightness of the current frame. Add it.

Since the built-in exposure time of the current frame is greater than the exposure time threshold of the current frame, and the actual exposure time of the current frame is changed to the exposure time threshold of the current frame, the actual exposure time of the current frame is reduced, and the ISO can be used. Enhance the brightness of the images acquired after shooting to obtain a better image.

The embodiment of the invention provides a photographing method, which uses the speed information of the previous frame to obtain the jitter speed of the current frame, and then obtains the jitter shift threshold value of the current frame according to the imaging information of the current frame, combined with the jitter speed of the current frame and the current frame. The jitter displacement threshold of the frame, calculate the exposure time threshold of the current frame, and finally adjust the actual exposure of the current frame according to the exposure time threshold of the current frame. Time, in the range of jitter to ensure image quality, the automatic adjustment of the exposure time ensures the sharpness of the image obtained in the case of camera shake.

Embodiment 2

Referring to FIG. 6 , an embodiment of the present invention provides a camera terminal 6 , where the terminal includes: an obtaining module 601, a calculating module 602, and an adjusting module 603;

The obtaining module 601 is configured to obtain the jitter speed of the current frame by using the speed information of the image of the previous frame when the camera shakes;

The calculating module 602 is configured to calculate an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame;

The adjusting module 603 is configured to adjust an actual exposure time of the current frame according to an exposure time threshold of the current frame.

Further, the acquiring module 601 is configured to acquire a horizontal acceleration and a vertical acceleration of the image of the previous frame;

The calculating module 602 is configured to calculate an average speed of the image of the previous frame according to the horizontal acceleration and the vertical acceleration; wherein an average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed;

Further, the acquiring module 601 is configured to obtain an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor;

The calculating module 602 is configured to calculate a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.

Further, referring to FIG. 7, the terminal further includes: a setting module 604; wherein

The obtaining module 601 is configured to acquire a built-in exposure time of the current frame calculated by the automatic exposure control;

The setting module 604 is configured to set an actual exposure time of the current frame to a built-in exposure time of the current frame when a built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame ;

And, when the built-in exposure time of the current frame is greater than an exposure time threshold of the current frame, setting an actual exposure time of the current frame to an exposure time threshold of the current frame.

Further, the adjusting module 603 is configured to: if the actual exposure time of the current frame is set to an exposure time threshold of the current frame, increase the current frame according to an actual exposure time of the current frame. The sensitivity gain complements the brightness of the current frame.

For the description of the camera terminal provided by the embodiment of the present invention, reference may be made to the description of the photographing method in the first embodiment, and details are not described herein again.

In an actual application, the obtaining module 601, the calculating module 602, the adjusting module 603, and the setting module 604 may each be a central processing unit (CPU), a microprocessor (Micro Processor Unit, MPU) located in the photographing terminal 6. ), digital signal processor (DSP), or Field Programmable Gate Array (FPGA) implementation.

The embodiment of the invention provides a camera terminal, which uses the speed information of the previous frame to obtain the jitter speed of the current frame, and then obtains the jitter displacement threshold of the current frame according to the imaging information of the current frame, combined with the jitter speed of the current frame and the current frame. The jitter displacement threshold of the frame, the exposure time threshold of the current frame is calculated, and finally the actual exposure time of the current frame is adjusted according to the exposure time threshold of the current frame, and the exposure time is within the jitter range of the guaranteed image quality. The automatic adjustment ensures the sharpness of the image obtained in the case of camera shake.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention is directed to a method, apparatus (system), and computer program in accordance with an embodiment of the present invention. The flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for generating settings by instructions executed by a processor of a computer or other programmable data processing device Means for implementing the functions specified in a block or blocks of a flow or a flow and/or a block diagram of a flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps that are set to implement the functions specified in one or more of the flow or in a block or blocks of the flowchart.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S101. Obtain a jitter speed of the current frame by using speed information of the image of the previous frame when the camera shakes;

S102: Obtain a jitter displacement threshold value of the current frame by using imaging parameter information of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor;

S103. Calculate an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold value of the current frame.

Optionally, in this embodiment, the foregoing storage medium may include, but is not limited to: a USB flash drive, only A medium that can store program code, such as a read-only memory (ROM), a random access memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, 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.

Industrial applicability

As described above, a photographing method and a terminal provided by the embodiments of the present invention have the following beneficial effects: obtaining the jitter speed of the current frame by using the velocity information of the previous frame, and obtaining the jitter shift gate of the current frame according to the imaging information of the current frame. The limit value, combined with the jitter speed of the current frame and the jitter displacement threshold of the current frame, calculates the exposure time threshold of the current frame, and finally adjusts the actual exposure time of the current frame according to the exposure time threshold of the current frame. The automatic adjustment of the exposure time within the jitter range of the image quality ensures the sharpness of the image obtained in the case of camera shake.

Claims

A photographing method, the method comprising:

Obtaining the jitter speed of the current frame by using the velocity information of the image of the previous frame when the camera shakes;

Acquiring, by using the imaging parameter information of the current frame, a jitter displacement threshold of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor;

Calculating an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame;

Adjusting an actual exposure time of the current frame according to an exposure time threshold of the current frame.
The method according to claim 1, wherein the obtaining the jitter speed of the current frame by using the velocity information of the image of the previous frame when the camera shakes comprises:

Obtaining a horizontal acceleration and a vertical acceleration of the image of the previous frame;

Calculating an average speed of the image of the previous frame according to the horizontal acceleration and the vertical acceleration; wherein an average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed;

Calculating a jitter speed of the current frame according to an average speed of the image of the previous frame.
The method according to claim 1, wherein the acquiring the jitter displacement threshold value of the current frame by using the imaging parameter information of the current frame; the imaging parameter information comprises: a pixel width of the imaging sensor, a distance of the object And image distance, including:

Obtaining an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor;

And calculating a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.
The method of claim 1, wherein the adjusting an actual exposure time of the current frame according to an exposure time threshold of the current frame comprises:

Obtaining a built-in exposure time of the current frame calculated by the automatic exposure control;

When the built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame, setting an actual exposure time of the current frame to a built-in exposure time of the current frame;

When the built-in exposure time of the current frame is greater than the exposure time threshold of the current frame, the actual exposure time of the current frame is set to an exposure time threshold of the current frame.
The method of claim 4, after the setting the actual exposure time of the current frame to the exposure time threshold of the current frame, further comprising:

If the actual exposure time of the current frame is set to the exposure time threshold of the current frame, the sensitivity of the current frame is increased to supplement the brightness of the current frame according to the actual exposure time of the current frame. .
A camera terminal, the terminal includes: an acquisition module, a calculation module, and an adjustment module; wherein

The acquiring module is configured to obtain a jitter speed of the current frame by using speed information of the image of the previous frame when the camera shakes;

And acquiring, by using the imaging parameter information of the current frame, a jitter displacement threshold value of the current frame; the imaging parameter information includes: a pixel width, an object distance, and an image distance of the imaging sensor;

The calculating module is configured to calculate an exposure time threshold of the current frame according to a jitter speed of the current frame and a jitter displacement threshold of the current frame;

The adjusting module is configured to adjust an actual exposure time of the current frame according to an exposure time threshold of the current frame.
The terminal according to claim 6, wherein

The acquiring module is configured to acquire a horizontal acceleration and a vertical acceleration of the image of the previous frame;

The calculation module is configured to calculate the calculation according to the horizontal acceleration and the vertical acceleration An average speed of the image of the previous frame; wherein the average speed of the image of the previous frame includes: a horizontal average speed and a vertical average speed;

And calculating a jitter speed of the current frame according to an average speed of the image of the previous frame.
The terminal according to claim 6, wherein

The acquiring module is configured to obtain an imaging displacement threshold value of the current frame according to a pixel width of the imaging sensor;

The calculating module is configured to calculate a jitter displacement threshold value of the current frame according to the object distance, the image distance, and an imaging displacement threshold value of the current frame.
The terminal according to claim 6, wherein the terminal further comprises: a setting module; wherein

The acquiring module is configured to acquire a built-in exposure time of the current frame calculated by the automatic exposure control;

The setting module is configured to set an actual exposure time of the current frame to a built-in exposure time of the current frame when a built-in exposure time of the current frame is less than or equal to an exposure time threshold of the current frame;

And, when the built-in exposure time of the current frame is greater than an exposure time threshold of the current frame, setting an actual exposure time of the current frame to an exposure time threshold of the current frame.
The terminal according to claim 9, wherein

The adjusting module is configured to: if the actual exposure time of the current frame is set to an exposure time threshold of the current frame, increase the sensitivity gain of the current frame according to an actual exposure time of the current frame Complement the brightness of the current frame.
A storage medium arranged to store a computer program for performing the photographing method according to any one of claims 1 to 5.