CN106060422B - Image exposure method and mobile terminal - Google Patents

Abstract

The present invention provides a kind of image exposure method and mobile terminals, first frame image is obtained the method comprise the steps that exposing with the first exposure parameter, it is exposed with the second exposure parameter and obtains the second frame image, wherein the first frame image and the second frame image are the image of camera continuous acquisition；According to predetermined local viewfinder range, the topography being overlapped in the second frame image with local viewfinder range is obtained；The first frame image and the topography are merged, generated a preview image.The image exposure scheme provided through the invention, the exposure effect that can only treat some region in exposure image are adjusted, therefore are able to ascend the quality of captured exposure image.

Description

Image exposure method and mobile terminal

technical field

The present invention relates to the technical field of image processing, and in particular, to an image exposure method and a mobile terminal.

Background technique

During image shooting or framing display, controlling the camera to perform reasonable exposure according to appropriate exposure compensation is a crucial condition for obtaining high-quality images. Most of the current mobile terminals support manual exposure adjustment. Manual exposure adjustment can be done in the following ways: the user clicks the setting button to trigger the mobile terminal to display the exposure bar on the screen, and the user slides the cursor in the exposure bar to adjust the exposure when the image is captured. Set the exposure compensation to achieve the purpose of adjusting the exposure effect.

At present, when the mobile terminal performs exposure processing on the image, the same exposure compensation processing is performed on the entire image. That is to say, if the user wants to adjust the exposure effect of a certain area in the image, other areas in the image will also be affected. Adjust for the same exposure effect. For example: when performing manual exposure processing on an image, the exposure compensation value is increased in order to increase the brightness of the dark part of the image. Then, although the brightness of the dark part of the final exposed image can be improved, the exposure compensation is not used. Areas with high front brightness will be overexposed.

It can be seen that the existing image exposure scheme cannot obtain a high-quality exposure image because it cannot only adjust the exposure effect of a certain area in the image to be exposed.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an image exposure method and a mobile terminal, so as to solve the inability to obtain high-quality exposed images in the existing image processing solutions due to the inability to only adjust the exposure effect of a certain area in the image to be exposed. The problem.

In a first aspect, an embodiment of the present invention provides an image exposure method, the method includes: exposing with a first exposure parameter to obtain a first frame of image, and exposing with a second exposure parameter to obtain a second frame of image, wherein the first frame of image The first frame of image and the second frame of image are images continuously collected by the camera; according to the predetermined local framing range, obtain the partial image in the second frame of image that overlaps with the local framing range; Partial images are merged to generate preview images.

In a second aspect, an embodiment of the present invention further provides a mobile terminal, the mobile terminal includes: a first image acquisition module, configured to obtain a first frame of image by exposure with a first exposure parameter, and obtain a first frame of image by exposure with a second exposure parameter Two frames of images, wherein the first frame of images and the second frame of images are images continuously collected by the camera; the partial image acquisition module is configured to acquire, according to a predetermined local viewing range, the second frame of images and the partial viewfinder Partial images with overlapping ranges; a merging module, configured to combine the first frame image and the partial image to generate a preview image.

In the image exposure method and mobile terminal provided by the embodiments of the present invention, two consecutively collected images are obtained with different exposure parameters, and a partial image in one frame is extracted and merged with another frame to generate a preview image. Since the two frames of images obtained are shot under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from the exposure effects of other areas in the image. The purpose of adjusting only the exposure effect of a certain area in the to-be-exposed image is realized, so the quality of the shot exposure image can be improved.

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand , the following specific embodiments of the present invention are given.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings that are used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

1 is a flow chart of steps of an image exposure method according to Embodiment 1 of the present invention;

2 is a flow chart of steps of an image exposure method according to Embodiment 2 of the present invention;

3 is a structural block diagram of a mobile terminal according to Embodiment 3 of the present invention;

4 is a structural block diagram of a mobile terminal according to Embodiment 4 of the present invention;

5 is a structural block diagram of a mobile terminal according to Embodiment 5 of the present invention;

FIG. 6 is a structural block diagram of a mobile terminal according to Embodiment 6 of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Referring to FIG. 1 , a flowchart of an image exposure method according to Embodiment 1 of the present invention is shown.

The image exposure method of the embodiment of the present invention includes the following steps:

Step S101 : exposing with a first exposure parameter to obtain a first frame of image, and exposing with a second exposure parameter to obtain a second frame of image.

The first frame of images and the second frame of images are images continuously collected by the camera. Since the two images are captured continuously by the camera, there is little difference in the objects in the images. The image collected by the camera may be obtained by taking pictures in the background, or may be an image that has been previewed and displayed in the preview interface.

It should be noted that, the first exposure parameter and the second exposure parameter may be preset by the user, or may be obtained by the mobile terminal according to the analysis of the images in front of the first frame image and the second frame image collected by the camera.

Step S102: Acquire a partial image that overlaps with the local viewing range in the second frame of images according to the predetermined partial viewing range.

The local framing range may be manually defined by the user, or automatically determined by the mobile terminal according to the brightness of each area in the to-be-shot image, or may be determined by the mobile terminal according to the subject in the to-be-shot image.

For example: the subject of the image to be captured is a tree, and the background is grass and blue sky. The mobile terminal can automatically identify the shooting subject, determine the tree in the image to be shot as the shooting subject, and determine the area where the tree is located as the local framing range. Then, when the partial image is acquired, the area where the tree is located in the second frame of image is the partial image that overlaps with the partial framing range.

Step S103: Combine the first frame image and the partial image to generate a preview image.

When merging, the first partial image in the first frame image that overlaps with the local viewing range can be determined; the merging operation can be completed by replacing the first partial image in the first frame with the partial image extracted from the second frame image , to generate a preview image. The partial image in the generated preview image can show different exposure effects from other areas.

For example, the exposure effect of the first frame image is the A effect, and the exposure effect of the second frame image is the B effect. The exposure effect of the partial image in the preview image is B, and the exposure effect of other areas is A. Therefore, the partial image in the preview image can show different exposure effects from other areas.

In the image exposure method provided by the embodiment of the present invention, two frames of images collected continuously are obtained with different exposure parameters, and a partial image in one frame of image is extracted and merged with another frame of image to generate a preview image. Since the two frames of images obtained are obtained under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from those of other areas in the image. For the purpose of adjusting only the exposure effect of a certain area in the image to be exposed, the quality of the captured exposure image can be improved.

Embodiment 2

Referring to FIG. 2 , a flowchart of an image exposure method according to Embodiment 2 of the present invention is shown.

The image exposure method of the embodiment of the present invention includes the following steps:

Step S201 : the mobile terminal determines a local framing range.

Determining the local framing range and target exposure effect before image exposure are two necessary conditions. The target exposure effect can be set by the user after the local framing range is determined, and the specific setting method can be referred to the relevant description in step S204. When determining the local framing range, you can use any of the following methods:

The first type: the mobile terminal determines the area in the preview interface that meets the set condition as the local framing range.

The area that satisfies the set condition may be the area occupied by the subject in the image, the area in the image whose brightness is lower than the first preset threshold, or the area in the image whose brightness is higher than the second preset threshold .

The second type: the mobile terminal receives the user's first setting operation for the local viewfinder range, and determines the local viewfinder range according to the first setting operation.

The user can manually delimit a range in the preview interface, and the mobile terminal determines the range manually delimited by the user as the local framing range.

The third type: the mobile terminal determines the area in the preview interface that meets the set conditions as the local framing range, and calibrates the determined local framing range in the preview interface; and receives the user's adjustment operation on the calibrated local framing range, and will The area of is determined as the local framing range.

The third method is a combination of automatic and manual methods. The mobile terminal first automatically determines a local framing range, and calibrates the determined range in the preview screen. When the calibrated local framing range does not meet the user's needs, the user can manually adjust the calibrated range until it meets his own needs, and the mobile terminal determines the user-adjusted area as the local framing range.

Step S202: The mobile terminal acquires the first odd-numbered frame image and the first even-numbered frame image continuously collected by the camera.

Wherein, the acquisition includes two situations of taking pictures and previewing and displaying. The images collected by the camera can be obtained by taking pictures in the background, or can be the images that have been previewed and displayed in the preview interface.

Step S203: The mobile terminal performs automatic exposure calculation on the first odd-numbered frame image to obtain a first exposure parameter.

A preferred method of performing automatic exposure calculation on the first odd-numbered frame image to obtain the first exposure parameter is as follows:

S1: Determine the first brightness value of the first odd-numbered frame image and the target brightness value corresponding to the automatic exposure.

Due to the brightness of each pixel in different images, the brightness value of each frame of image is also different. The determination of the brightness value of the image may be performed in the related art, which is not specifically limited in the embodiment of the present invention. For example, by averaging the brightness values of the pixels in the image, the obtained average value can be determined as the brightness value corresponding to the image.

When the mobile terminal automatically exposes the image, it will automatically determine the target brightness value according to the brightness of the image to be shot and the brightness of the current environment.

S2: Obtain the first exposure parameter by calculating the first brightness value and the target brightness value.

The purpose of exposing the image is to obtain an image with the same brightness value as the target brightness value. In order to obtain such an image, the mobile terminal needs to expose the image to be captured according to certain exposure parameters. Therefore, in this step, it is necessary to calculate and obtain the first exposure parameter according to the first brightness value and the target brightness value, which is used as the exposure parameter when the next odd-numbered frame image is collected.

Step S204 : the mobile terminal performs exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation to obtain a second exposure parameter.

Exposure adjustment operations include: brightness adjustment, exposure compensation conditions, etc. Through exposure adjustment, the exposure parameters of the mobile terminal when capturing images can be adjusted, so that the exposure effect of the final captured image is close to or achieves the user's target exposure effect.

When the user is performing the exposure adjustment operation, he can instruct the mobile terminal to display the exposure bar in the preview interface by clicking a specific button on the preview interface of the mobile terminal, and the user can adjust the exposure compensation value or the target brightness value by sliding the cursor in the exposure bar. .

Of course, the exposure bar may not be displayed, and the user can adjust the exposure compensation value by sliding his finger up and down on the preview interface. For example, if the user slides his finger up, according to the size of the sliding distance, it is mapped to exposure compensation 0 to exposure compensation +4 in turn; when the user slides his finger down, it is also mapped to exposure compensation 0 to exposure compensation -4 according to the distance. A user exposure compensation value option can also be provided, and the user can select an exposure compensation value by selecting and selecting.

A preferred method of performing exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation, and obtaining the second exposure parameter is as follows:

S1: Determine the target exposure brightness according to the user's first exposure adjustment operation.

When the user's first exposure adjustment operation is an adjustment operation on the exposure compensation value, the mobile terminal can obtain the target exposure brightness by calculating the exposure compensation value. When the user's first exposure adjustment operation is an adjustment operation on the target brightness value, the mobile terminal may directly determine the target brightness value adjusted by the user as the target exposure brightness.

S2: Determine the second brightness value of the first even-numbered frame image.

The second brightness value of the first even-numbered frame image can be determined by adopting a corresponding manner to determine the first brightness value of the first odd-numbered frame image.

S3: Obtain a second exposure parameter by calculating the second brightness value and the target exposure brightness.

It should be noted that, steps S201 to S203 are described by taking the method of determining the exposure parameter of the image currently to be exposed by the brightness value of the previous frame image and the target brightness value as an example. In the specific implementation process, the exposure parameters are not limited to be determined by the mobile terminal, and can also be preset by the user according to actual needs. Correspondingly, the mobile terminal obtains the first frame of image by exposure with the first exposure parameter, and before obtaining the second frame of image by exposure with the second exposure parameter, it can directly obtain the first exposure parameter preset by the user, and obtain the second frame image preset by the user. After the exposure parameters are set, the cameras are controlled to shoot corresponding frame images respectively with the obtained exposure parameters.

Step S205 : the mobile terminal obtains the first frame of image by exposure with the first exposure parameter, and obtains the second frame of image by exposure with the second exposure parameter.

The first frame of images and the second frame of images are images continuously collected by the camera. In the embodiment of the present invention, the first frame image is the second odd frame image, and the second frame image is the second even frame image.

In the embodiment of the present invention, the odd-numbered frame images and the even-numbered frame images collected by the camera are separated for processing. When exposing each odd-numbered frame image, the exposure parameters obtained by analyzing the previous odd-numbered frame image are used to expose the image; when exposing each even-numbered frame image, the image is exposed by using the exposure parameters obtained by analyzing the previous odd-numbered frame image; Expose the image by analyzing the exposure parameters obtained.

Step S206: The mobile terminal acquires, according to the predetermined local framing range, a partial image in the second frame of image that overlaps with the local framing range.

In this step, the partial image in the second even-numbered frame image that overlaps with the partial framing range is acquired.

Step S207: The mobile terminal combines the first frame image and the partial image to generate a preview image.

When merging, determine the first partial image in the first frame image that coincides with the partial viewing range; use the partial image extracted from the second frame image to replace the first partial image in the first frame with the replaced first partial image The frame image is a preview image, and the partial image in the generated preview image can show different exposure effects from other areas.

After the preview image is generated, if the exposure effect of the generated preview image does not meet the user's requirement, the user can perform a second exposure adjustment operation to re-adjust the exposure effect. The second exposure adjustment operation performed by the user is similar to the first exposure adjustment operation. The exposure effect can be adjusted by adjusting the exposure compensation value, and the exposure effect can also be adjusted by adjusting the target brightness value. For the specific manner in which the user performs the second exposure adjustment operation, refer to the relevant description of the user performing the first exposure adjustment operation described in step S203, which is not specifically limited in the embodiment of the present invention.

Step S208: The mobile terminal performs automatic exposure calculation on the first frame of image to obtain a third exposure parameter.

For the specific method of obtaining the third exposure parameter by the mobile terminal performing automatic exposure calculation on the first frame of image, please refer to the relevant description of the mobile terminal performing automatic exposure calculation on the first odd-numbered frame image to obtain the first exposure parameter. This is not specifically limited.

In this step, the first frame image, that is, the second odd frame image, is automatically exposed to calculate the third exposure parameter. set exposure effect.

It should be noted that, step S208 is not limited to be executed after step S207, and can be executed at any time after the first frame of image is obtained, and of course, it can also be executed in parallel with step S207.

Step S209: The mobile terminal performs exposure calculation on the second frame of image according to the user's second exposure adjustment operation to obtain a fourth exposure parameter.

When calculating the fourth exposure parameter, the mobile terminal may determine the second target exposure brightness according to the user's second exposure adjustment operation, and at the same time determine the third brightness value of the second frame image, that is, the second even-numbered frame image. The second target exposure brightness is calculated to obtain a fourth exposure parameter.

In this step, the second frame image, that is, the second even-numbered frame image, is subjected to exposure calculation to obtain the fourth exposure parameter. exposure effect.

Step S209 is not limited to be executed after step S208, and can be executed at any time after the second frame of image is obtained, and of course, it can also be executed in parallel with step S207 and step S208.

Step S210 : the mobile terminal obtains a third odd-numbered frame image by exposing with a third exposure parameter, and obtains a third even-numbered frame image by exposing with a fourth exposure parameter.

The third odd-numbered frame image and the third even-numbered frame image are images continuously collected by the camera.

Step S211 : the mobile terminal acquires, according to the predetermined local framing range, a partial image that overlaps with the local framing range in the third even-numbered frame image.

The local framing range may be the same as or different from the local framing range determined in step S204. After the mobile terminal executes the preview image generated in step S207, the user can not only adjust the exposure effect through the second exposure adjustment operation, but also adjust the local framing range, and the mobile terminal needs to re-determine the local framing range. Therefore, if the user adjusts the local framing range, the local framing range determined in this step and the local framing range determined in step S204 will be different; otherwise, they are the same.

Step S212: The mobile terminal combines the third odd-numbered frame image and the partial images in the third even-numbered frame image to generate a preview image.

When merging, the second partial image in the third frame image that overlaps with the partial viewing range can be determined; the partial image extracted from the third even-numbered frame image can be used to replace the second partial image in the third odd-numbered frame. The merge operation generates a preview image, and the partial image in the generated preview image can show different exposure effects from other areas.

In the embodiment of the present invention, the image exposure method in the embodiment of the present invention is only described by taking the generation of two frames of preview images as an example. During the specific implementation process, if the generated preview image does not meet the user's requirements, steps S208 to S208 to S208 may be executed repeatedly. S212 generates a third frame preview image, a fourth frame preview image, and the like.

In the image exposure method provided by the embodiment of the present invention, two frames of images collected continuously are obtained with different exposure parameters, and a partial image in one frame of image is extracted and merged with another frame of image to generate a preview image. Since the two frames of images obtained are obtained under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from those of other areas in the image. For the purpose of adjusting only the exposure effect of a certain area in the image to be exposed, the quality of the captured exposure image can be improved.

Embodiment 3

Referring to FIG. 3 , a structural block diagram of a mobile terminal according to Embodiment 3 of the present invention is shown.

The mobile terminal in this embodiment of the present invention includes: a first image acquisition module 301, configured to obtain a first frame of image by exposure with a first exposure parameter, and obtain a second frame of image by exposure with a second exposure parameter, wherein the first frame of image and the second frame image are images continuously collected by the camera; the partial image acquisition module 302 is used to obtain the partial image that overlaps with the local viewing range in the second frame image according to the predetermined local viewing range; the merging module 303 is used for A preview image is generated by merging the first frame image and the partial image.

When exposing images, the mobile terminal according to the embodiment of the present invention obtains two frames of images continuously collected with different exposure parameters, and extracts a partial image from one frame of images and merges them with another frame of images to generate a preview image. Since the two frames of images obtained are obtained under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from those of other areas in the image. For the purpose of adjusting only the exposure effect of a certain area in the image to be exposed, the quality of the captured exposure image can be improved.

Embodiment 4

Referring to FIG. 4 , a structural block diagram of a mobile terminal according to Embodiment 4 of the present invention is shown.

The mobile terminal in the embodiment of the present invention is a further optimization of the mobile terminal in the third embodiment. The optimized mobile terminal includes: a first image acquisition module 401, configured to obtain a first frame of image by exposure with a first exposure parameter; Exposure with two exposure parameters to obtain a second frame of image, wherein the first frame of image and the second frame of image are images continuously collected by a camera; the local image acquisition module 402 is configured to acquire the first frame of image according to a predetermined local framing range. A partial image in the two frames of images that overlaps with the partial viewing range; the merging module 403 is configured to combine the first frame image and the partial image to generate a preview image.

Preferably, the mobile terminal further comprises: a second image acquisition module 404, configured to obtain a first frame image by exposure with a first exposure parameter in the first image acquisition module 401, and obtain a second frame by exposure with a second exposure parameter Before the image, the first odd-numbered frame image and the first even-numbered frame image continuously collected by the camera are acquired; the first exposure parameter determination module 405 is configured to perform automatic exposure calculation on the first odd-numbered frame image to obtain the first exposure parameter; The second exposure parameter determination module 406 is configured to perform exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation to obtain a second exposure parameter.

Preferably, the mobile terminal further includes: a first parameter acquisition module 407, configured to obtain a first frame image by exposure with a first exposure parameter in the first image acquisition module 401, and obtain a second frame by exposure with a second exposure parameter Before the image, obtain the first exposure parameter preset by the user; the second parameter obtaining module 408 is configured to obtain the second exposure parameter preset by the user.

Preferably, the mobile terminal further includes: a third exposure parameter determination module 409, configured to obtain the first frame image by exposure with the first exposure parameter in the first image obtaining module 401, and obtain the second frame image by exposure with the second exposure parameter After framing the image, perform automatic exposure calculation on the first frame image to obtain a third exposure parameter; the fourth exposure parameter determination module 410 is configured to perform exposure calculation on the second frame image according to the user's second exposure adjustment operation , the fourth exposure parameter is obtained.

Preferably, the mobile terminal further includes: a third image acquisition module 411, configured to obtain a third odd-numbered frame image by exposure with a third exposure parameter after the merging module 403 generates a preview image, and obtain a third odd-numbered frame image by exposure with a fourth exposure parameter The third even-numbered frame image, wherein the third odd-numbered frame image and the third even-numbered frame image are images continuously collected by the camera; the second partial image acquisition module 412 is configured to obtain the The partial images in the three even-numbered frame images that overlap with the partial viewing range; the second merging module 413 is configured to combine the third odd-numbered frame images and the partial images in the third even-numbered frame images to generate a preview image.

Preferably, the mobile terminal further includes: a first range determination module 414, configured to, before the second image acquisition module 404 acquires the first odd-numbered frame image and the first even-numbered frame image continuously shot by the camera, set the image in the preview interface The area that satisfies the setting condition is determined as the local viewfinder range; or, the second range determination module 415 is configured to receive the user's first setting operation on the local viewfinder range, and determine the local viewfinder range according to the first setting operation; The three-range determination module 416 is configured to determine the area that satisfies the set conditions in the preview interface as the local viewfinder range, calibrate the determined local viewfinder range in the preview interface, and receive the user's adjustment to the calibrated local viewfinder range operation to determine the adjusted area as the local framing range.

Preferably, the first exposure parameter determination module 405 includes: a brightness value determination sub-module 4051 for determining a first brightness value of the first odd-numbered frame image and a target brightness value corresponding to automatic exposure; a calculation sub-module 4052 , which is used to obtain the first exposure parameter by calculating the first brightness value and the target brightness value.

Preferably, the second exposure parameter determination module 406 includes: a brightness value determination sub-module 4061, configured to determine the target exposure brightness according to the user's first exposure adjustment operation, and determine the second brightness value of the first even-numbered frame image; Module 4062, configured to obtain a second exposure parameter by calculating the second brightness value and the target exposure brightness.

Preferably, the merging module 403 includes: a partial image determination sub-module for determining a first partial image in the first frame of images that coincides with the partial viewing range; an extraction sub-module for using the second partial image The partial image extracted from the frame image replaces the first partial image in the first frame image; the preview image determination submodule is used for taking the replaced first frame image as the preview image.

The mobile terminal according to the embodiment of the present invention is used to implement the corresponding image exposure methods in the first embodiment and the second embodiment, and has the beneficial effects corresponding to the method embodiments, which will not be repeated here.

Embodiment 5

Referring to FIG. 5 , a structural block diagram of a mobile terminal according to Embodiment 5 of the present invention is shown.

The mobile terminal 700 in the embodiment of the present invention includes: at least one processor 701 , a memory 702 , at least one network interface 704 and a user interface 703 . The various components in the mobile terminal 700 are coupled together by a bus system 705 . It can be understood that the bus system 705 is used to implement the connection communication between these components. In addition to the data bus, the bus system 705 also includes a power bus, a control bus and a status signal bus. However, for clarity of illustration, the various buses are labeled as bus system 705 in FIG. 5 .

Among them, the user interface 703 may include a display, a keyboard or a pointing device such as a mouse, a trackball, a touch pad or a touch screen, and the like.

It can be understood that the memory 702 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Wherein, the non-volatile memory may be Read-Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (Erasable PROM, EPROM), Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) and Direct memory bus random access memory (DirectRam bus RAM, DRRAM). The memory 702 of the systems and methods described in embodiments of the present invention is intended to include, but not be limited to, these and any other suitable types of memory.

In some embodiments, memory 702 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set of them: an operating system 7021 and applications 7022 .

The operating system 7021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application program 7022 includes various application programs, such as a media player (Media Player), a browser (Browser), etc., for implementing various application services. The program for implementing the method of the embodiment of the present invention may be included in the application program 7022 .

In this embodiment of the present invention, by calling the program or instruction stored in the memory 702, specifically, the program or instruction stored in the application program 7022, the processor 701 is configured to expose the first frame image with the first exposure parameter to obtain the first frame of image. Exposure with the second exposure parameter to obtain a second frame of image, wherein the first frame of image and the second frame of image are images continuously collected by a camera; according to a predetermined local framing range, the second frame of image and the local framing are obtained. Partial images with overlapping ranges; combine the first frame image and the partial image to generate a preview image.

The methods disclosed in the above embodiments of the present invention may be applied to the processor 701 or implemented by the processor 701 . The processor 701 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by an integrated logic circuit of hardware in the processor 701 or an instruction in the form of software. The above-mentioned processor 701 may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other possible Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and completes the steps of the above method in combination with its hardware.

It will be appreciated that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more Application Specific Integrated Circuits (ASIC), Digital Signal Processing (DSP), Digital Signal Processing Device (DSP Device, DSPD), programmable logic Devices (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in this application or a combination thereof.

For software implementation, the techniques described in the embodiments of the present invention may be implemented through modules (eg, procedures, functions, etc.) that perform the functions described in the embodiments of the present invention. Software codes may be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

Optionally, the processor 701 is further configured to: obtain the first odd-numbered frame images continuously collected by the camera before obtaining the first frame of image by exposure with the first exposure parameter, and before obtaining the second frame of image by exposure with the second exposure parameter. the first even-numbered frame image; perform automatic exposure calculation on the first odd-numbered frame image to obtain a first exposure parameter; perform exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation to obtain a second exposure parameter .

Preferably, the processor 701 is further configured to: obtain a first exposure parameter preset by a user before obtaining a first frame of image by exposure with a first exposure parameter, and obtain a first exposure parameter preset by a user before obtaining a second frame of image by exposure with a second exposure parameter; Preset second exposure parameters.

Preferably, the processor 701 is further configured to: perform automatic exposure calculation on the first frame of image after exposure with a first exposure parameter to obtain a first frame of image, and after exposure with a second exposure parameter to obtain a second frame of image, Obtain a third exposure parameter; perform exposure calculation on the second frame of image according to the user's second exposure adjustment operation to obtain a fourth exposure parameter.

Preferably, the processor 701 is further configured to: after the preview image is generated, obtain a third odd-numbered frame image by exposure with a third exposure parameter, and obtain a third even-numbered frame image by exposure with a fourth exposure parameter, wherein the third The odd-numbered frame image and the third even-numbered frame image are images continuously collected by the camera; according to the predetermined local viewing range, obtain the partial image in the third even-numbered frame image that overlaps with the local viewing range; Combine with the partial image in the third even-numbered frame image to generate a preview image.

Preferably, the processor 701 is further configured to: before acquiring the first odd-numbered frame image and the first even-numbered frame image continuously shot by the camera, determine the area in the preview interface that satisfies the set condition as the local framing range; or, receive For the first setting operation of the local framing range by the user, the local framing range is determined according to the first setting operation; or, the area that satisfies the setting conditions in the preview interface is determined as the local framing range, and the determined all framing range is calibrated in the preview interface. The local framing range is received; the user's adjustment operation on the calibrated local framing range is received, and the adjusted area is determined as the local framing range.

Preferably, the processor 701 performs automatic exposure calculation on the first odd-numbered frame image, and when obtaining the first exposure parameter, the processor 701 is specifically used to: determine the first brightness value of the first odd-numbered frame image, and the corresponding automatic exposure The first exposure parameter is obtained by calculating the first brightness value and the target brightness value.

Preferably, when the processor 701 performs exposure calculation on the first even-numbered frame images according to the user's first exposure adjustment operation, and obtains the second exposure parameter, the processor 701 is specifically used for: determining the target exposure according to the user's first exposure adjustment operation brightness, and determine the second brightness value of the first even-numbered frame image; and obtain the second exposure parameter by calculating the second brightness value and the target exposure brightness.

Preferably, when the processor 701 combines the first frame image and the partial image to generate a preview image, the processor 701 is specifically configured to: determine a first frame of image that overlaps with the partial viewing range in the first frame image. A partial image; the partial image extracted from the second frame image is used to replace the first partial image in the first frame image; and the replaced first frame image is used as a preview image.

The mobile terminal 700 can implement each process implemented by the mobile terminal in the foregoing embodiments, and in order to avoid repetition, details are not repeated here.

In the mobile terminal of the embodiment of the present invention, two frames of images collected continuously are obtained with different exposure parameters, and a partial image in one frame of image is extracted and merged with another frame of image to generate a preview image. Since the two frames of images obtained are obtained under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from those of other areas in the image. For the purpose of adjusting only the exposure effect of a certain area in the image to be exposed, the quality of the captured exposure image can be improved.

Embodiment 6

Referring to FIG. 6 , a structural block diagram of a mobile terminal according to Embodiment 6 of the present invention is shown.

The mobile terminal in the embodiment of the present invention may be a mobile phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), or a vehicle-mounted computer.

The mobile terminal in FIG. 6 includes a radio frequency (RF) circuit 810 , a memory 820 , an input unit 830 , a display unit 840 , a processor 860 , an audio circuit 870 , a WiFi (Wireless Fidelity) module 880 and a power supply 890 .

Wherein, the input unit 830 can be used to receive numerical or character information input by the user, and generate signal input related to user setting and function control of the mobile terminal 800 . Specifically, in this embodiment of the present invention, the input unit 830 may include a touch panel 8301 . The touch panel 8301, also known as a touch screen, can collect the user's touch operations on or near it (such as the user's operations on the touch panel 8301 using any suitable objects or accessories such as a finger, a stylus, etc.) The specified program drives the corresponding connection device. Optionally, the touch panel 8301 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the 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 it into contact coordinates, and then sends it to the touch controller. To the processor 860, and can receive the commands sent by the processor 860 and execute them. In addition, the touch panel 8301 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 8301, the input unit 830 may also include other input devices 8302, and the other input devices 8302 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, etc. one or more of.

The display unit 840 may be used to display information input by the user or information provided to the user and various menu interfaces of the mobile terminal. The display unit 840 may include a display panel 8401, and optionally, the display panel 8401 may be configured in the form of an LCD or an organic light-emitting diode (Organic Light-Emitting Diode, OLED).

It should be noted that the touch panel 8301 can cover the display panel 8401 to form a touch display screen. When the touch display screen detects a touch operation on or near it, it is transmitted to the processor 860 to determine the type of the touch event, and then the processor The 860 provides corresponding visual output on the touch display depending on the type of touch event.

The touch screen includes the application program interface display area and the commonly used controls display area. The arrangement of the application program interface display area and the common control display area is not limited, and may be an arrangement that can distinguish the two display areas, such as up-down arrangement, left-right arrangement, or the like. The application program interface display area can be used to display the interface of the application program. Each interface may contain at least one application icon and/or interface elements such as widget desktop controls. The application program interface display area can also be an empty interface that does not contain any content. The commonly used control display area is used to display controls with high usage rate, such as setting buttons, interface numbers, scroll bars, phonebook icons and other application icons.

The processor 860 is the control center of the mobile terminal, using various interfaces and lines to connect various parts of the entire mobile phone, by running or executing the software programs and/or modules stored in the first memory 8201, and calling the software programs and/or modules stored in the second memory 8202, perform various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole. Optionally, processor 860 may include one or more processing units.

In this embodiment of the present invention, by calling and storing software programs and/or modules in the first memory 8201 and/or data in the second memory 8202, the processor 860 is configured to expose the first frame with the first exposure parameter to obtain the first frame The second frame of image is obtained by exposing the image with the second exposure parameter, wherein the first frame of image and the second frame of image are images continuously collected by the camera; A partial image that overlaps with the partial viewing range; the first frame image and the partial image are combined to generate a preview image.

Optionally, the processor 860 is further configured to: acquire the first odd-numbered frame images and images of the first odd-numbered frames continuously collected by the camera before obtaining the first frame of image by exposure with the first exposure parameter, and before obtaining the second frame of image by exposure with the second exposure parameter. the first even-numbered frame image; perform automatic exposure calculation on the first odd-numbered frame image to obtain a first exposure parameter; perform exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation to obtain a second exposure parameter .

Preferably, the processor 860 is further configured to: obtain the first exposure parameter preset by the user before obtaining the first frame of image by exposure with the first exposure parameter, and obtain the first exposure parameter preset by the user before obtaining the second frame of image by exposure with the second exposure parameter; Preset second exposure parameters.

Preferably, the processor 860 is further configured to: perform automatic exposure calculation on the first frame of image after exposure with the first exposure parameter to obtain the first frame of image, and after exposure with the second exposure parameter to obtain the second frame of image, Obtain a third exposure parameter; perform exposure calculation on the second frame of image according to the user's second exposure adjustment operation to obtain a fourth exposure parameter.

Preferably, the processor 860 is further configured to: after the preview image is generated, obtain a third odd-numbered frame image by exposure with a third exposure parameter, and obtain a third even-numbered frame image by exposure with a fourth exposure parameter, wherein the third The odd-numbered frame image and the third even-numbered frame image are images continuously collected by the camera; according to the predetermined local viewing range, obtain the partial image in the third even-numbered frame image that overlaps with the local viewing range; Combine with the partial image in the third even-numbered frame image to generate a preview image.

Preferably, the processor 860 is further configured to: before acquiring the first odd-numbered frame image and the first even-numbered frame image continuously shot by the camera, determine the area in the preview interface that satisfies the set condition as the local framing range; or, receive For the first setting operation of the local framing range by the user, the local framing range is determined according to the first setting operation; or, the area that satisfies the setting conditions in the preview interface is determined as the local framing range, and the determined all framing range is calibrated in the preview interface. The local framing range is received; the user's adjustment operation on the calibrated local framing range is received, and the adjusted area is determined as the local framing range.

Preferably, when the processor 860 performs automatic exposure calculation on the first odd-numbered frame image, and obtains the first exposure parameter, the processor 860 is specifically used for: determining the first brightness value of the first odd-numbered frame image, and the corresponding automatic exposure The first exposure parameter is obtained by calculating the first brightness value and the target brightness value.

Preferably, when the processor 860 performs exposure calculation on the first even-numbered frame images according to the user's first exposure adjustment operation, and obtains the second exposure parameter, the processor 860 is specifically used for: determining the target exposure according to the user's first exposure adjustment operation brightness, and determine the second brightness value of the first even-numbered frame image; and obtain the second exposure parameter by calculating the second brightness value and the target exposure brightness.

Preferably, when the processor 860 combines the first frame image and the partial image to generate a preview image, the processor 860 is specifically configured to: determine the first frame image in the first frame image that coincides with the partial viewing range. A partial image; the partial image extracted from the second frame image is used to replace the first partial image in the first frame image; and the replaced first frame image is used as a preview image.

The image exposure performed by the mobile terminal according to the embodiment of the present invention is to obtain two consecutively collected images with different exposure parameters, and extract a partial image from one frame of the image and combine it with another frame of image to generate a preview image. Since the two frames of images obtained are obtained under different exposure parameters, the exposure effects are different, and the exposure effects of the partial images merged in the corresponding merged preview image are different from those of other areas in the image. For the purpose of adjusting only the exposure effect of a certain area in the image to be exposed, the quality of the captured exposure image can be improved.

As for the apparatus embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for related parts.

The image exposure schemes provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used with teaching based on this. The structure required to construct a system having the aspects of the present invention is apparent from the above description. Furthermore, the present invention is not directed to any particular programming language. It is to be understood that various programming languages may be used to implement the inventions described herein, and that the descriptions of specific languages above are intended to disclose the best mode for carrying out the invention.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or its description. This disclosure, however, should not be construed as reflecting an intention that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

Those of ordinary skill in the art can understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination, unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the image exposure scheme according to embodiments of the present invention. The present invention can also be implemented as apparatus or apparatus programs (eg, computer programs and computer program products) for performing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

It should be noted that the above-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

Those skilled in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of the present invention can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (12)

1. An image exposure method, characterized in that the method comprises: Exposure with the first exposure parameter to obtain a second odd-numbered frame image, and exposure with the second exposure parameter to obtain a second even-numbered frame image, wherein the second odd-numbered frame image and the second even-numbered frame image are images continuously collected by the camera; Acquiring, according to the predetermined local framing range, a partial image that overlaps with the local framing range in the second even-numbered frame image; Merging the second odd-numbered frame image and the partial image to generate a preview image; Wherein, before exposing with the first exposure parameter to obtain the second odd-numbered frame image, and exposing with the second exposure parameter to obtain the second even-numbered frame image, the method further includes: Obtain the first odd-numbered frame image and the first even-numbered frame image continuously collected by the camera; performing automatic exposure calculation on the first odd-numbered frame images to obtain a first exposure parameter; Performing exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation to obtain a second exposure parameter; Wherein, generating the preview image by merging the second odd-numbered frame image and the partial image includes: determining a first partial image in the second odd-numbered frame image that coincides with the partial viewing range; Replace the first partial image in the second odd-numbered frame image with the partial image extracted from the second even-numbered frame image; Take the second odd-numbered frame image after replacement as the preview image. 2 . The method according to claim 1 , wherein the second odd-numbered frame image is obtained by exposing with the first exposure parameter, and after the second even-numbered frame image is obtained by exposing with the second exposure parameter, the method further comprises: 3 . Perform automatic exposure calculation on the second odd-numbered frame image to obtain a third exposure parameter; Exposure calculation is performed on the second even-numbered frame image according to the user's second exposure adjustment operation to obtain a fourth exposure parameter. 3. The method according to claim 2, characterized in that, after generating the preview image, further comprising: Exposure with a third exposure parameter to obtain a third odd-numbered frame image, and exposure with a fourth exposure parameter to obtain a third even-numbered frame image, wherein the third odd-numbered frame image and the third even-numbered frame image are images continuously collected by the camera; According to the predetermined local framing range, obtain a partial image that overlaps with the local framing range in the third even-numbered frame image; Merging the third odd-numbered frame image and the partial images in the third even-numbered frame image to generate a preview image; The generating a preview image by merging the third odd-numbered frame image and the partial images in the third even-numbered frame image includes: determining a first partial image in the third odd-numbered frame image that coincides with the partial viewing range; Replace the first partial image in the third odd-numbered frame image with the partial image extracted from the third even-numbered frame image; Take the replaced third odd-numbered frame image as the preview image. 4. The method according to claim 1, wherein before acquiring the first odd-numbered frame image and the first even-numbered frame image continuously shot by the camera, further comprising: Determine the area in the preview interface that meets the set conditions as the local framing range; or, Receive a user's first setting operation on the local framing range, and determine the local framing range according to the first setting operation; or, Determine the area that satisfies the setting conditions in the preview interface as the local viewfinder range, and calibrate the determined local viewfinder range in the preview interface; receive the user's adjustment operation on the calibrated local viewfinder range, and determine the adjusted area For the local viewfinder range. 5. The method according to claim 1, wherein the step of performing automatic exposure calculation on the first odd-numbered frame images to obtain the first exposure parameter comprises: determining the first brightness value of the first odd-numbered frame image, and the target brightness value corresponding to automatic exposure; The first exposure parameter is obtained by calculating the first brightness value and the target brightness value. 6. The method according to claim 1, wherein the step of performing exposure calculation on the first even-numbered frame image according to a user's first exposure adjustment operation to obtain the second exposure parameter comprises: determining the target exposure brightness according to the user's first exposure adjustment operation; determining the second brightness value of the first even-numbered frame image; The second exposure parameter is obtained by calculating the second brightness value and the target exposure brightness. 7. A mobile terminal, wherein the mobile terminal comprises: A first image acquisition module, configured to obtain a second odd-numbered frame image by exposure with a first exposure parameter, and obtain a second even-numbered frame image by exposure with a second exposure parameter, wherein the second odd-numbered frame image and the second even-numbered frame image are: Images captured by the camera continuously; a local image acquisition module, configured to acquire, according to a predetermined local framing range, a local image that overlaps with the local framing range in the second even-numbered frame image; a merging module for merging the second odd-numbered frame image and the partial image to generate a preview image; Also includes: The second image acquisition module is configured to acquire the first image continuously collected by the camera before the first image acquisition module obtains the second odd-numbered frame image by exposure with the first exposure parameter, and obtains the second even-numbered frame image by exposure with the second exposure parameter. The odd-numbered frame image and the first even-numbered frame image; a first exposure parameter determination module, configured to perform automatic exposure calculation on the first odd-numbered frame images to obtain a first exposure parameter; A second exposure parameter determination module, configured to perform exposure calculation on the first even-numbered frame image according to the user's first exposure adjustment operation, to obtain a second exposure parameter; Wherein, the merging module includes: a partial image determination submodule, configured to determine a first partial image in the second odd-numbered frame image that overlaps with the partial viewing range; Extraction submodule for replacing the first partial image in the second odd frame image with the partial image extracted from the second even frame image; The preview image determination submodule is used for taking the second odd-numbered frame image after replacement as the preview image. 8. The mobile terminal according to claim 7, wherein the mobile terminal further comprises: The third exposure parameter determination module is configured to, after the first image acquisition module obtains a second odd-numbered frame image by exposing with the first exposure parameter, and obtains a second even-numbered frame image by exposing with the second exposure parameter, analyze the second odd-numbered frame image by exposure with the second exposure parameter. The frame image is subjected to automatic exposure calculation to obtain the third exposure parameter; The fourth exposure parameter determination module is configured to perform exposure calculation on the second even-numbered frame images according to the user's second exposure adjustment operation to obtain fourth exposure parameters. 9. The mobile terminal according to claim 8, wherein the mobile terminal further comprises: A third image acquisition module, configured to obtain a third odd-numbered frame image by exposure with a third exposure parameter, and obtain a third even-numbered frame image by exposure with a fourth exposure parameter after the merging module generates the preview image, wherein the third The odd-numbered frame images and the third even-numbered frame images are images continuously collected by the camera; a second partial image acquisition module, configured to acquire, according to a predetermined local framing range, a partial image that overlaps with the local framing range in the third even-numbered frame image; a second merging module, configured to merge the third odd-numbered frame image and the partial images in the third even-numbered frame image to generate a preview image; The generating a preview image by merging the third odd-numbered frame image and the partial images in the third even-numbered frame image includes: determining a first partial image in the third odd-numbered frame image that coincides with the partial viewing range; Replace the first partial image in the third odd-numbered frame image with the partial image extracted from the third even-numbered frame image; Take the replaced third odd-numbered frame image as the preview image. 10. The mobile terminal according to claim 7, wherein the mobile terminal further comprises: a first range determination module, configured to determine an area that satisfies the set condition in the preview interface as a local framing range before the second image acquisition module acquires the first odd-numbered frame image and the first even-numbered frame image continuously shot by the camera; or, The second range determination module is configured to receive a user's first setting operation on the local framing range, and determine the local framing range according to the first setting operation; or, The third range determination module is used to determine the area in the preview interface that satisfies the set condition as the local viewfinder range, and calibrate the determined local viewfinder range in the preview interface; receive the user's adjustment to the calibrated local viewfinder range operation to determine the adjusted area as the local framing range. 11. The mobile terminal according to claim 7, wherein the first exposure parameter determination module comprises: a brightness value determination submodule, configured to determine the first brightness value of the first odd-numbered frame image and the target brightness value corresponding to automatic exposure; The calculation sub-module is configured to obtain a first exposure parameter by calculating the first brightness value and the target brightness value. 12. The mobile terminal according to claim 7, wherein the second exposure parameter determination module comprises: a brightness value determination sub-module, configured to determine the target exposure brightness according to the user's first exposure adjustment operation; determine the second brightness value of the first even-numbered frame image; The calculation sub-module is configured to obtain a second exposure parameter by calculating the second brightness value and the target exposure brightness.