WO2018219267A1

WO2018219267A1 - Exposure method and device, computer-readable storage medium, and mobile terminal

Info

Publication number: WO2018219267A1
Application number: PCT/CN2018/088820
Authority: WO
Inventors: 卓世杰; 李小朋
Original assignee: Oppo广东移动通信有限公司
Priority date: 2017-05-31
Filing date: 2018-05-29
Publication date: 2018-12-06
Also published as: CN107147823A

Abstract

The present application relates to an exposure method and device, a computer-readable storage medium and a mobile terminal. The method comprises: after a picture is stable, detecting whether there is a change area in the picture; if it is detected that there is a change area in the picture, acquiring an exposure time adjustment value according to the position and a change speed of the change area; and adjusting an exposure time according to the exposure time adjustment value. In the method, the photographed photograph can be made clearer, by detecting a change area existing in a picture, after the picture is stable, and adaptively adjusting an exposure time.

Description

Exposure method, device, computer readable storage medium, and mobile terminal

Cross-reference to related applications

This application claims the priority of the Chinese Patent Application filed on May 31, 2017, the Chinese Patent Application No. 201710400639.2, entitled "Exposure Method, Apparatus, Computer Readable Storage Medium, and Mobile Terminal", the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference.

Technical field

The present application relates to the field of computer technology, and in particular, to an exposure method, apparatus, computer readable storage medium, and mobile terminal.

Background technique

In the process of photography, exposure means that light passes through the shutter of the photographic device to cause a latent image of the photosensitive layer, and the exposed photosensitive layer is developed to obtain an image. Among them, the length of the exposure time will directly affect the texture and clarity of the image. The short exposure time will result in insufficient image exposure, and the long exposure time will cause the image to be overexposed. When the exposure is insufficient, the image is gray and the color is not bright. When the exposure is excessive, when the exposure is excessive, the highlight portion of the image is bright and lacks layering.

Summary of the invention

Embodiments of the present application provide an exposure method, apparatus, computer readable storage medium, and mobile terminal, which can adjust an exposure time.

An exposure method comprising:

After the picture is stable, it is detected whether there is a change area in the picture;

If it is detected that there is a change area in the picture, the exposure time adjustment value is obtained according to the position and the change speed of the change area; and

The exposure time is adjusted according to the exposure time adjustment value.

An exposure device comprising:

a detecting module, configured to detect whether there is a change area in the screen after the picture is stable;

An acquiring module, configured to obtain an exposure time adjustment value according to a position and a change speed of the change area if a change area is detected in the screen; and

The adjustment module is configured to adjust the exposure time according to the exposure time adjustment value.

A mobile terminal includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

The exposure time is adjusted according to the exposure time adjustment value.

A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the following steps:

The exposure time is adjusted according to the exposure time adjustment value.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the present application, which are common in the art. For the skilled person, other drawings can be obtained from these drawings without any creative work.

Figure 1 is a flow chart of an exposure method in one embodiment;

2 is a flow chart of an exposure method in another embodiment;

Figure 3 is a block diagram showing the structure of an exposure apparatus in an embodiment;

4 is a block diagram showing a part of a structure of a mobile phone related to a mobile terminal provided by an embodiment of the present application.

detailed description

In order to make the objects, technical solutions, and advantages of the present application more comprehensible, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

Figure 1 is a flow chart of an exposure method in one embodiment. As shown in FIG. 1, an exposure method includes steps 102 to 106. among them:

In step 102, after the picture is stabilized, it is detected whether there is a change area in the picture.

After detecting that the acquired picture is stable after the shooting program is enabled, the mobile terminal calls a motion detection algorithm to detect whether there is a changed area in the picture. The mobile terminal can detect the motion state of the mobile terminal by acquiring the data of the gyroscope corresponding to the current frame picture, and the brightness value of the focus of the ROI (Region Of Interest) in the current frame picture can detect whether the picture body is backlit. It is determined whether the picture acquired by the mobile terminal is stable by the motion state of the mobile terminal corresponding to the continuous frame picture and the backlight condition of the picture body. Determining the mobile terminal if the value of the data of the gyroscope in the mobile terminal corresponding to the continuous frame picture is within the first threshold and the change value of the brightness SAD (Sum Of Absolute Differences) of the focus ROI is within the second threshold The acquired picture is stable. The mobile terminal detects the number of frames of the continuous frame picture, and the mobile terminal acquires the picture of the corresponding frame according to the preset number of consecutive frames, and detects whether the picture is stable.

After the mobile terminal detects that the picture is stable, the motion detection algorithm is enabled to detect whether there is a change area in the picture. Among them, the change area refers to an area that partially changes when the picture is stable. For example, the picture acquired by the mobile terminal is a portrait. When the mobile terminal detects that the acquired picture is stable, the motion detection algorithm is enabled to detect whether there is a change area in the picture. For example, when the arm of the figure moves in the picture, the motion detection algorithm detects a partial change. The area, that is, the area in which the arm is determined to move, is the changed area.

Commonly used motion detection algorithms include frame difference method, symmetric frame difference method, averaging algorithm, single Gaussian background model algorithm, and mixed Gaussian model algorithm. The frame difference method includes: after the picture is stabilized, one frame image is selected as the background image, and then each frame image obtained after the motion detection algorithm is enabled is compared with the background image, and the difference image is obtained, and the difference image is obtained. The value of the pixel determines whether there is a change area in the picture. When the acquired image is consistent with the background image, the value of the pixel in the difference image obtained by the difference calculation is 0, that is, the difference image is a pure black image; when the value of the pixel in the difference image is not 0, That is, there is a difference between the acquired image and the background image, and whether there is a change region in the screen can be determined by the number and distribution of pixels that are not 0 in the difference image. For example, the number of pixel values that are not 0 in the difference image exceeds the specified value and/or the number of consecutively arranged pixels that are not 0 in the difference image exceeds a specified value, that is, there is a change region in the determination screen. When the background image is selected, any frame image in the continuous frame picture when the detection picture is stable may be selected as the background image, for example, the last frame image in the continuous frame picture is used as the background image when the picture is stable.

Step 104: If it is detected that there is a change area in the picture, the exposure time adjustment value is obtained according to the position of the change area and the change speed.

When the mobile terminal detects that there is a change region in the screen by using the motion detection algorithm, the exposure time adjustment value may be acquired according to the position and the change speed of the change region in the screen. The location of the change area includes a body area and a background area. When the mobile terminal enables the shooting program, after acquiring the focus area of the screen, the area growth algorithm can be used to detect the main area of the screen, and the area other than the main area in the picture is the background area. For example, after the shooting program is enabled, the mobile terminal acquires a picture as a portrait, and obtains a focus area set by a touch operation acting on the mobile interface, such as a belly area of a portrait, and after detecting the focus area, detecting by a region growth method In the main body area, the main body area in which the screen is detected is generated by the area from the belly area of the portrait as a portrait. The portion of the picture other than the body area is the background area. Obtaining the exposure time adjustment value according to the position and the change speed of the change region includes: obtaining the exposure time adjustment precision by the position of the change region being the body region or the background region, and acquiring the exposure time adjustment value according to the change speed of the change region. In another embodiment, the exposure time adjustment accuracy may be acquired according to the position of the change region being the body region or the background region, and the exposure time adjustment value is obtained according to the change speed and the change distance of the change region.

Step 106, adjusting the exposure time according to the exposure time adjustment value.

Through the motion detection algorithm, the mobile terminal can acquire the exposure time adjustment value in real time according to the position and the change speed of the changed area. When the mobile terminal detects that there is a focus area in the picture, the exposure time is adjusted in real time according to the exposure time adjustment value; when the mobile terminal detects that there is no focus area in the picture, after detecting that the focus area exists in the picture, according to the exposure time The adjustment value adjusts the exposure time in real time. That is, when the change area of the change in the picture is small, and the focus area in the picture is not lost, the exposure time is adjusted in real time according to the acquired exposure time adjustment value; when the change area in the picture changes greatly, the focus area in the picture is lost, and the acquisition is detected. Adjust the exposure time when focusing on the area.

In the exposure method of the embodiment of the present application, when the image is detected to be stable, the motion detection algorithm detects whether there is a change area in the picture, and when it is detected that there is a change area in the picture, adjusting the exposure time according to the motion state of the changed area, the shooting may be performed. The photos are clearer, avoiding the fact that in the conventional shooting method, the exposure time is not adjusted after the image is stable, and the partial area of the shooting picture caused by the movement of the partial area of the picture is blurred.

In an embodiment, after the exposure time is adjusted according to the exposure time adjustment value, the exposure method further includes: detecting whether a shooting instruction is received within a preset time period; if the shooting instruction is not received, re-detecting whether there is a change area in the screen; A change area is detected in the screen, and the exposure time is adjusted according to the exposure time adjustment value corresponding to the change area.

After the mobile terminal adjusts the exposure time according to the obtained exposure time adjustment value, it detects whether a shooting instruction is received within the preset time period, and if a shooting instruction is received, the shooting is performed according to the adjusted exposure time; if the shooting instruction is not received, the motion detection is adopted. The algorithm detects whether there is a change area in the picture. If a change area exists in the picture, the exposure time adjustment value is acquired according to the position and the change speed of the change area, and the exposure time is re-adjusted according to the acquired exposure time adjustment value.

In the exposure method of the embodiment of the present application, after adjusting the exposure time, detecting whether an instruction to take a photo is received within a preset time period, and receiving an instruction to take a photo takes a photo according to the adjusted exposure time; The command continues to dynamically adjust the exposure time, and adjusts the exposure time in real time according to the movement of the changing area in the picture to ensure the sharpness of the shooting picture.

In one embodiment, obtaining the exposure time adjustment value according to the position and the change speed of the change region in step 104 includes: obtaining an exposure time adjustment accuracy according to the position of the change region; and obtaining an exposure time adjustment value according to the exposure time adjustment accuracy and the change speed.

After detecting the changed area in the picture by the motion detection algorithm, the mobile terminal can determine that the changed area in the picture is the main body area or the background area, and then acquire the exposure time adjustment precision corresponding to the preset change area, and adjust the accuracy and the change area according to the exposure time. Change the speed to get the exposure time adjustment value. The change speed of the change region can be detected by the motion detection algorithm, and the change distance of each pixel in the change region can be obtained by the value of the pixel in the difference image, and the change time can be obtained by the time difference between the two frames. The rate of change of each pixel can be obtained by varying the distance and the time of change. When the change region in the screen is the main region, the exposure time adjustment accuracy is high; when the change region in the screen is the background region, the exposure time adjustment accuracy is low. When the change region is the body region, the closer the distance between the change region and the focus region is, the higher the exposure time adjustment accuracy is. The faster the change region changes, the larger the exposure time adjustment value of the image, and the shorter the exposure time. For example, in the picture acquired by the mobile terminal, the main body area is a portrait, and the focus area is a head of the portrait. After the picture is stabilized, if the motion detection algorithm detects that the changed area in the picture is the arm of the portrait, that is, the changed area is the main area. The exposure time adjustment precision is relatively high, and the corresponding exposure time adjustment value is obtained according to the movement speed of the arm of 1 million pixels per second, and the adjustment time is -0.005 s; if the motion detection algorithm detects that the changed region in the picture is the vehicle in the background area, the movement speed For a value of 3 million pixels per second, the corresponding exposure time adjustment value is -0.005s.

In one embodiment, when the change region is the body region, the exposure time adjustment value is obtained according to the change speed of the change region and the distance between the change region and the focus region; when the change region is the background region, the exposure time is not adjusted.

In an embodiment, detecting whether there is a change region in the picture in step 102 includes: detecting, by the motion detection algorithm, whether there is a moving object in the picture; if detecting that the moving object exists, determining that there is a change area in the picture.

When the mobile terminal detects whether there is a change region in the stable picture, the motion detection algorithm detects whether there is a moving object in the picture. Among them, the moving object may include an integrally moving object or a partially moving object. For example, the picture acquired by the mobile terminal is a portrait picture, and when the motion detection algorithm detects that the whole picture moves to the left or right in the picture, that is, the object that detects the overall motion, there is a change area in the picture; the motion detection algorithm detects the motion. When the portrait arm moves in the picture, a part of the moving object is detected, and there is a change area in the picture.

In one embodiment, the exposure method further includes: setting a detection accuracy to the motion detection algorithm, and detecting whether there is a change region in the screen according to the set detection accuracy.

The mobile terminal can also set the detection accuracy of the motion detection algorithm when detecting whether there is a change region in the picture by using the motion detection algorithm. The higher the detection accuracy, the smaller the difference value detectable between the current detected image and the background image, that is, the higher the detection accuracy, the smaller the change of the change region can be detected. For example, when the detection precision set by the motion detection algorithm is high, the pixel value of the change region change can be detected when the pixel value is 100,000 pixels; when the detection accuracy set by the motion detection algorithm is low, the pixel value of the change region change is 50. A megapixel value can be detected.

In the embodiment of the present application, the detection accuracy is set for the motion detection algorithm, and the motion detection algorithm with different precisions can detect different changes. By setting the precision of the motion detection algorithm, it can be applied to different detection environments, and the practicality of the exposure method in the embodiment of the present application is improved.

Figure 2 is a flow chart of an exposure method in one embodiment. As shown in FIG. 2, an exposure method includes steps 202 to 212. among them:

Step 202, enabling the shooting process. The mobile terminal starts the shooting process.

In step 204, the detected picture is stable. The picture is determined to be stable by acquiring the sum of the absolute values of the gyro data of the continuous frame and the brightness of the focus ROI, and after detecting that the picture is stable, the motion detection algorithm is enabled to detect the picture.

In step 206, the motion detection algorithm detects the picture. The motion detection algorithm is used to detect the picture.

Step 208, whether a change area is detected. It is determined whether there is a change area in the stable picture, if there is a change area, the process proceeds to step 210; if there is no change area, the process proceeds to step 212.

In step 210, it is necessary to adjust the exposure time. It is determined whether the exposure time and the exposure time adjustment value need to be adjusted according to the position of the change area and the change speed of the change area. If it is necessary to adjust the exposure time, the process proceeds to step 214. If it is not necessary to adjust the exposure time, the process proceeds to step 212.

Step 212, receiving a shooting instruction shooting. According to the receipt of the shooting command, the current exposure time is used for shooting.

In step 214, the exposure time is adjusted. Adjust the exposure time based on the acquired exposure time adjustment value.

The steps in the method flowchart of the embodiment of the present application are sequentially displayed in accordance with the indication of the arrow, but the steps are not necessarily performed in the order indicated by the arrow. Except as explicitly stated herein, the execution of these steps is not strictly limited, and may be performed in other sequences. Moreover, at least some of the steps in the method flowchart of the embodiment of the present application may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be executed at different times. The order of execution is not necessarily performed sequentially, but may be performed alternately or alternately with at least a portion of other steps or sub-steps or stages of other steps.

Fig. 3 is a block diagram showing the structure of an exposure apparatus in an embodiment. As shown in FIG. 3, an exposure apparatus includes a detection module 302, an acquisition module 304, and an adjustment module 306.

The detecting module 302 is configured to detect whether there is a change area in the screen after the screen is stable.

The obtaining module 304 is configured to obtain an exposure time adjustment value according to the position and the change speed of the change area if it is detected that there is a change area in the screen.

The adjustment module 306 is configured to adjust the exposure time according to the exposure time adjustment value.

In an embodiment, the detecting module 302 is further configured to detect whether a shooting instruction is received within a preset time period; if the shooting instruction is not received, re-detecting whether there is a change area in the screen; the adjusting module is further configured to: if the image is detected again There is a change area, and the exposure time is adjusted according to the exposure time adjustment value corresponding to the change area detected again.

In an embodiment, the detecting module 302 is further configured to detect whether there is a change region in the screen according to the set detection precision.

In an embodiment, the obtaining module 304 is further configured to acquire an exposure time adjustment accuracy according to the position of the change region; and obtain an exposure time adjustment value according to the exposure time adjustment accuracy and the change speed.

In one embodiment, the detecting module 302 is further configured to detect, by the motion detection algorithm, whether there is a moving object in the picture; if it is detected that the moving object exists, it is determined that there is a changed area in the picture.

The division of each module in the above exposure apparatus is for illustrative purposes only. In other embodiments, the exposure apparatus may be divided into different modules as needed to perform all or part of the functions of the exposure apparatus described above.

Each of the above-described exposure devices may be implemented in whole or in part by software, hardware, and combinations thereof. Each of the above modules may be embedded in a hardware form or independent of a processor in the server, or may be stored in a software in a memory in the server, so that the processor calls to perform operations corresponding to the above modules. As used in this application, the terms "component", "module" and "system" and the like are intended to mean a computer-related entity, which may be hardware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a server and a server can be a component. One or more components can reside within a process and/or executed thread, and the components can be located within one computer and/or distributed between two or more computers.

The embodiment of the present application also provides a computer readable storage medium. A computer readable storage medium having stored thereon a computer program that, when executed by a processor, implements the following steps:

(1) After the screen is stable, check if there is a change area in the screen.

After detecting that the acquired picture is stable after the shooting program is enabled, the mobile terminal calls a motion detection algorithm to detect whether there is a changed area in the picture. The mobile terminal can detect the motion state of the mobile terminal by acquiring the data of the gyroscope corresponding to the current frame picture, and the brightness value of the focus ROI in the current frame picture can detect whether the picture body is backlit. It is determined whether the picture acquired by the mobile terminal is stable by the motion state of the mobile terminal corresponding to the continuous frame picture and the backlight condition of the picture body. If the value of the data of the gyro in the mobile terminal corresponding to the continuous frame picture is within the first threshold and the change value of the brightness SAD of the focus ROI is within the second threshold, it is determined that the picture acquired by the mobile terminal is stable. The mobile terminal detects the number of frames of the continuous frame picture, and the mobile terminal acquires the picture of the corresponding frame according to the preset number of consecutive frames, and detects whether the picture is stable.

(2) If a change region is detected in the screen, the exposure time adjustment value is acquired according to the position of the change region and the change speed.

(3) Adjust the exposure time according to the exposure time adjustment value.

Through the motion detection algorithm, the mobile terminal can acquire the exposure time adjustment value in real time according to the position and the change speed of the changed area. When the mobile terminal detects that there is a focus area in the screen, the exposure time is adjusted in real time according to the exposure time adjustment value; when the mobile terminal detects that there is no focus area in the picture, after detecting that the focus area exists in the picture, according to the exposure time The adjustment value adjusts the exposure time in real time. That is, when the change area of the change in the picture is small, and the focus area in the picture is not lost, the exposure time is adjusted in real time according to the acquired exposure time adjustment value; when the change area in the picture changes greatly, the focus area in the picture is lost, and the acquisition is detected. Adjust the exposure time when focusing on the area.

In an embodiment, the obtaining the exposure time adjustment value according to the position and the change speed of the change region in the step (2) comprises: obtaining the exposure time adjustment accuracy according to the position of the change region; and obtaining the exposure time adjustment value according to the exposure time adjustment accuracy and the change speed. .

After detecting the changed area in the picture by the motion detection algorithm, the mobile terminal can determine that the changed area in the picture is the main body area or the background area, and then acquire the exposure time adjustment precision corresponding to the preset change area, and adjust the accuracy and the change area according to the exposure time. Change the speed to get the exposure time adjustment value. The change speed of the change region can be detected by the motion detection algorithm, and the change distance of each pixel in the change region can be obtained by the value of the pixel in the difference image, and the change time can be obtained by the time difference between the two frames. The rate of change of each pixel can be obtained by varying the distance and the time of change. When the change region in the screen is the main region, the exposure time adjustment accuracy is high; when the change region in the screen is the background region, the exposure time adjustment accuracy is low. When the change region is the body region, the closer the distance between the change region and the focus region is, the higher the exposure time adjustment accuracy is. The faster the change region changes, the larger the exposure time adjustment value of the image, and the shorter the exposure time.

In an embodiment, detecting whether there is a change region in the picture in step (1) comprises: detecting, by the motion detection algorithm, whether there is a moving object in the picture; if detecting that the moving object exists, determining that there is a change area in the picture.

When the mobile terminal detects whether there is a change region in the stable picture, the motion detection algorithm detects whether there is a moving object in the picture. Among them, the moving object may include an integrally moving object or a partially moving object.

The mobile terminal can also set the detection accuracy of the motion detection algorithm when detecting whether there is a change region in the picture by using the motion detection algorithm. The higher the detection accuracy, the smaller the difference value detectable between the current detected image and the background image, that is, the higher the detection accuracy, the smaller the change of the change region can be detected.

The embodiment of the present application further provides a mobile terminal. As shown in FIG. 3, for the convenience of description, only the parts related to the embodiments of the present application are shown. For the specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The mobile terminal can be any mobile device, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), an on-board computer, a wearable device, or the like, and the mobile terminal is used as a mobile phone as an example. :

4 is a block diagram showing a part of a structure of a mobile phone related to a mobile terminal provided by an embodiment of the present application. Referring to FIG. 4, the mobile phone includes: a radio frequency (RF) circuit 410, a memory 420, an input unit 430, a display unit 440, a sensor 450, an audio circuit 460, a wireless fidelity (WiFi) module 470, and a processor 480. And power supply 490 and other components. It will be understood by those skilled in the art that the structure of the mobile phone shown in FIG. 4 does not constitute a limitation to the mobile phone, and may include more or less components than those illustrated, or a combination of certain components, or different component arrangements.

The RF circuit 410 can be used for receiving and transmitting information during the transmission and reception of information or during the call. The downlink information of the base station can be received and processed by the processor 480. The uplink data can also be sent to the base station. Generally, RF circuits include, but are not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuitry 410 can also communicate with the network and other devices via wireless communication. The above wireless communication may use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (Code Division). Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), e-mail, Short Messaging Service (SMS), and the like.

The memory 420 can be used to store software programs and modules, and the processor 480 executes various functional applications and data processing of the mobile phone by running software programs and modules stored in the memory 420. The memory 420 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as an application of a sound playing function, an application of an image playing function, etc.); The data storage area can store data (such as audio data, address book, etc.) created according to the use of the mobile phone. Moreover, memory 420 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 430 can be configured to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the handset 400. Specifically, the input unit 430 may include a touch panel 431 and other input devices 432. The touch panel 431, which may also be referred to as a touch screen, can collect touch operations on or near the user (such as a user using a finger, a stylus, or the like on the touch panel 431 or near the touch panel 431. Operation) and drive the corresponding connection device according to a preset program. In one embodiment, the touch panel 431 can include two portions of a touch detection device and a touch controller. Wherein, the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends the touch information. The processor 480 is provided and can receive commands from the processor 480 and execute them. In addition, the touch panel 431 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 431, the input unit 430 may also include other input devices 432. In particular, other input devices 432 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.).

The display unit 440 can be used to display information input by the user or information provided to the user as well as various menus of the mobile phone. The display unit 440 can include a display panel 441. In one embodiment, the display panel 441 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. In one embodiment, the touch panel 431 can cover the display panel 441. When the touch panel 431 detects a touch operation on or near the touch panel 431, it transmits to the processor 480 to determine the type of the touch event, and then the processor 480 is The type of touch event provides a corresponding visual output on display panel 441. Although the touch panel 431 and the display panel 441 are used as two independent components to implement the input and input functions of the mobile phone in FIG. 4, in some embodiments, the touch panel 431 and the display panel 441 may be integrated. Realize the input and output functions of the phone.

The handset 400 can also include at least one type of sensor 450, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 441 according to the brightness of the ambient light, and the proximity sensor may close the display panel 441 and/or when the mobile phone moves to the ear. Or backlight. The motion sensor may include an acceleration sensor, and the acceleration sensor can detect the magnitude of the acceleration in each direction, and the magnitude and direction of the gravity can be detected at rest, and can be used to identify the gesture of the mobile phone (such as horizontal and vertical screen switching), and vibration recognition related functions (such as Pedometer, tapping, etc.; in addition, the phone can also be equipped with gyroscopes, barometers, hygrometers, thermometers, infrared sensors and other sensors.

Audio circuitry 460, speaker 461, and microphone 462 can provide an audio interface between the user and the handset. The audio circuit 460 can transmit the converted electrical data of the received audio data to the speaker 461 for conversion to the sound signal output by the speaker 461; on the other hand, the microphone 462 converts the collected sound signal into an electrical signal by the audio circuit 460. After receiving, it is converted into audio data, and then processed by the audio data output processor 480, transmitted to another mobile phone via the RF circuit 410, or outputted to the memory 420 for subsequent processing.

WiFi is a short-range wireless transmission technology, and the mobile phone can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 470, which provides users with wireless broadband Internet access. Although FIG. 4 shows the WiFi module 470, it can be understood that it does not belong to the essential configuration of the mobile phone 400 and can be omitted as needed.

The processor 480 is the control center of the handset, and connects various portions of the entire handset using various interfaces and lines, by executing or executing software programs and/or modules stored in the memory 420, and invoking data stored in the memory 420, executing The phone's various functions and processing data, so that the overall monitoring of the phone. In one embodiment, processor 480 can include one or more processing units. In one embodiment, processor 480 can integrate an application processor and a modem processor, where the application processor primarily processes an operating system, user interface, applications, and the like; the modem processor primarily processes wireless communications. It can be understood that the above modem processor may not be integrated into the processor 480.

The handset 400 also includes a power source 490 (such as a battery) that supplies power to the various components. Preferably, the power source can be logically coupled to the processor 480 via a power management system to manage functions such as charging, discharging, and power management through the power management system.

In one embodiment, the handset 400 may also include a camera, a Bluetooth module, and the like.

In the embodiment of the present application, the processor 480 included in the mobile terminal implements the following steps when executing a computer program stored in the memory:

(1) After the screen is stable, check if there is a change area in the screen.

When the mobile terminal detects that there is a change region in the screen by using the motion detection algorithm, the exposure time adjustment value may be acquired according to the position and the change speed of the change region in the screen. The location of the change area includes a body area and a background area. When the mobile terminal enables the shooting program, after acquiring the focus area of the screen, the area growth algorithm can be detected by the area growing algorithm, and the area other than the main area in the picture is the background area. For example, after the shooting program is enabled, the mobile terminal acquires a picture as a portrait, and obtains a focus area set by a touch operation acting on the mobile interface, such as a belly area of a portrait, and after detecting the focus area, detecting by a region growth method In the main body area, the main body area in which the screen is detected is generated by the area from the belly area of the portrait as a portrait. The portion of the picture other than the body area is the background area. Obtaining the exposure time adjustment value according to the position and the change speed of the change region includes: obtaining the exposure time adjustment precision by the position of the change region being the body region or the background region, and acquiring the exposure time adjustment value according to the change speed of the change region. In another embodiment, the exposure time adjustment accuracy may be acquired according to the position of the change region being the body region or the background region, and the exposure time adjustment value is obtained according to the change speed and the change distance of the change region.

(3) Adjust the exposure time according to the exposure time adjustment value.

A person skilled in the art can understand that all or part of the process of implementing the above embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a non-volatile computer readable storage medium. The program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or the like.

The above embodiments are merely illustrative of several embodiments of the present application, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the claims. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present application. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An exposure method comprising:

After the picture is stable, it is detected whether there is a change area in the picture;

If it is detected that there is a change area in the picture, the exposure time adjustment value is obtained according to the position and the change speed of the change area; and

The exposure time is adjusted according to the exposure time adjustment value.
The exposure method according to claim 1, wherein the adjusting the exposure time according to the exposure time adjustment value further comprises:

Detecting whether a shooting instruction is received within a preset time period;

If the shooting instruction is not received, re-detect whether there is a change area in the screen; and

If it is detected again that there is a change region in the screen, the exposure time is adjusted based on the exposure time adjustment value corresponding to the change region detected again.
The exposure method according to claim 1, wherein the obtaining the exposure time adjustment value according to the position and the change speed of the change region comprises:

Obtaining an exposure time adjustment accuracy according to the position of the change region; and

The exposure time adjustment value is acquired according to the exposure time adjustment accuracy and the change speed.
The exposure method according to claim 1, wherein the detecting whether there is a change area in the picture comprises:

The motion detection algorithm detects whether there is a moving object in the picture; if it is detected that there is a moving object, it is determined that the changed area exists in the picture.
The exposure method according to claim 4, further comprising:

The detection accuracy is set for the motion detection algorithm, and whether the change region exists in the screen is detected according to the set detection accuracy.
An exposure device comprising:

a detecting module, configured to detect whether there is a change area in the screen after the picture is stable;

An acquiring module, configured to obtain an exposure time adjustment value according to a position and a change speed of the change area if a change area exists in the screen is detected;

The adjustment module is configured to adjust the exposure time according to the exposure time adjustment value.
A mobile terminal includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

After the picture is stable, it is detected whether there is a change area in the picture;

If it is detected that there is a change area in the picture, the exposure time adjustment value is obtained according to the position and the change speed of the change area; and

The exposure time is adjusted according to the exposure time adjustment value.
The mobile terminal according to claim 7, wherein when the computer program is executed by the processor, after the adjusting the exposure time according to the exposure time adjustment value, the processor is further caused to perform the following steps :

Detecting whether a shooting instruction is received within a preset time period;

If the shooting instruction is not received, re-detect whether there is a change area in the screen; and

If it is detected again that there is a change region in the screen, the exposure time is adjusted based on the exposure time adjustment value corresponding to the change region detected again.
The mobile terminal according to claim 7, wherein the obtaining the exposure time adjustment value according to the position and the change speed of the change region performed by the processor comprises:

Obtaining an exposure time adjustment accuracy according to the position of the change region; and

The exposure time adjustment value is acquired according to the exposure time adjustment accuracy and the change speed.
The mobile terminal according to claim 7, wherein whether the change area exists in the detection picture executed by the processor comprises:

The motion detection algorithm detects whether there is a moving object in the picture; if it is detected that there is a moving object, it is determined that the changed area exists in the picture.
The mobile terminal of claim 10, wherein the processor further performs:

The detection accuracy is set for the motion detection algorithm, and whether the change region exists in the screen is detected according to the set detection accuracy.
A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the following steps:

After the picture is stable, it is detected whether there is a change area in the picture;

If it is detected that there is a change area in the picture, the exposure time adjustment value is obtained according to the position and the change speed of the change area; and

The exposure time is adjusted according to the exposure time adjustment value.
The computer readable storage medium according to claim 12, wherein said computer program is executed by said processor, said processor being further caused after said adjusting exposure time according to said exposure time adjustment value Perform the following steps:

Detecting whether a shooting instruction is received within a preset time period;

If the shooting instruction is not received, re-detect whether there is a change area in the screen; and

If it is detected again that there is a change region in the screen, the exposure time is adjusted based on the exposure time adjustment value corresponding to the change region detected again.
The computer readable storage medium according to claim 12, wherein the obtaining, by the processor, the obtaining an exposure time adjustment value according to a position and a change speed of the change region comprises:

Obtaining an exposure time adjustment accuracy according to the position of the change region; and

The exposure time adjustment value is acquired according to the exposure time adjustment accuracy and the change speed.
The computer readable storage medium according to claim 12, wherein whether the change region exists in the detection screen executed by the processor comprises:

The motion detection algorithm detects whether there is a moving object in the picture; if it is detected that there is a moving object, it is determined that the changed area exists in the picture.
The computer readable storage medium of claim 15 wherein the processor further executes:

The detection accuracy is set for the motion detection algorithm, and whether the change region exists in the screen is detected according to the set detection accuracy.