CN108320263A - A kind of method, device and mobile terminal of image procossing - Google Patents

Abstract

Embodiments of the present invention provide an image processing method, device, and mobile terminal. The method includes: acquiring a first image captured by a camera; performing down-sampling processing on the first image to generate a second image; Perform preset processing on the second image to generate a third image, the preset processing includes beautification processing and/or blurring processing; interpolation processing is performed on the third image to generate a target image, and the pixel value of the target image The difference with the pixel value of the first image is smaller than the preset threshold, which solves the time-consuming problem in the prior art of directly performing beautification or blurring on images with higher pixel values captured by the camera.

Description

Image processing method, device and mobile terminal

technical field

Embodiments of the present invention relate to the technical field of image processing, and in particular, to an image processing method, device, and mobile terminal.

Background technique

At present, the camera function on smartphones is very powerful. It can not only beautify photos, but also present some camera effects that can only be obtained in post-processing. For example, photo blur and so on.

However, in order to obtain personalized photos, the processor of the smartphone needs to perform a large number of calculations on the images when taking beautification photos or blurring photos, which not only consumes a lot of power, but also takes a long time for users to wait for image processing. Especially when multiple special effects are used to shoot high-pixel-value photos at the same time, such as when the beautification and blurring functions are turned on at the same time to take a 2000W pixel photo, the processor must first perform beautification processing on the image, and then perform beautification processing on the beautified image. The image is then blurred. Due to the high pixel value of the shot, the beauty and blur processing time will be longer. The user must wait for a long time to complete the shooting of a photo.

Contents of the invention

Embodiments of the present invention provide an image processing method, device, and mobile terminal, so as to solve the problem that it takes a long time to perform beautification and blur processing on photos with relatively high pixel values.

In order to solve the above technical problems, in the first aspect, the embodiment of the present invention provides an image processing method applied to a mobile terminal, including:

Obtain the first image collected by the camera;

performing downsampling processing on the first image to generate a second image;

performing preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing;

Interpolation processing is performed on the third image to generate a target image, and a difference between a pixel value of the target image and a pixel value of the first image is smaller than a preset threshold.

In the second aspect, the embodiment of the present invention also provides an image processing device, which is applied to a mobile terminal, including:

An acquisition module, configured to acquire the first image collected by the camera;

A downsampling module, configured to downsample the first image to generate a second image;

A preset processing module, configured to perform preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing;

The interpolation module is configured to perform interpolation processing on the third image to generate a target image, and the difference between the pixel values of the target image and the pixel values of the first image is smaller than a preset threshold.

In the third aspect, the embodiment of the present invention also provides a mobile terminal, including a processor, a memory, and a computer program stored in the memory and operable on the processor, and the computer program is executed by the processor When executed, the steps of the above-mentioned image processing method are realized.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above image processing method are realized.

In this way, in the embodiment of the present invention, after the first image captured by the camera is acquired, the first image is not directly processed for beautification, blurring, etc., but the first image is processed to a lower pixel value by down-sampling The second image, and then perform beautification, blurring and other processing on the second image, and then through interpolation processing, the third image is restored to the target image with original pixel values, which improves the efficiency of beautification and blurring processing, and reduces the The processing time reduces the power consumption when taking pictures, and solves the time-consuming problem of directly performing beautification or blurring on images with higher pixel values collected by the camera in the prior art.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a flow chart of the steps of a method for image processing according to an embodiment of the present invention;

Fig. 2 is a flow chart of steps of another image processing method according to an embodiment of the present invention;

Fig. 3 is a structural block diagram of an image processing device according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a hardware structure of a mobile terminal according to an embodiment of the present invention.

Detailed ways

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

Referring to FIG. 1 , it shows a flow chart of the steps of an image processing method according to an embodiment of the present invention, which may specifically include the following steps:

Step 101, obtaining the first image collected by the camera;

It should be noted that this method can be applied to mobile terminals. For example, mobile phones, tablet computers, or other electronic devices with camera functions. This embodiment does not limit the specific type of the mobile terminal.

In this embodiment of the present invention, the first image may be an image captured by a camera of the mobile terminal, and the image may have a relatively high pixel value. Generally, images captured with higher pixel values have higher image quality.

It should be noted that the pixel value of the first image may match the pixel value that can be captured by the camera of the mobile terminal. For example, if the camera of the mobile terminal can capture an image with 2000W pixels, the maximum pixel value of the first image can be 2000W pixels.

Alternatively, the pixel value of the first image may be a pixel value set by the user. Generally, the pixel value set by the user should be smaller than the maximum pixel value that can be captured by the camera of the mobile terminal. For example, if the camera of the mobile terminal can capture images with 2000W pixels, the user can set the first image with no more than 2000W pixels when shooting according to actual needs.

Step 102, performing down-sampling processing on the first image to generate a second image;

Downsampling (Subsampled) is an image processing operation. Its principle is: for an image with a size of M*N, it is downsampled by s times to obtain (M/s)*(N/s) size resolution image.

In the embodiment of the present invention, a second image with a lower pixel value can be obtained by performing down-sampling processing on the first image.

For example, if the pixel value of the first image is 2000W, a second image with a pixel value of 500W can be obtained through down-sampling processing. Of course, the pixel value of the second image obtained by down-sampling the first image can be determined according to the actual sampling rate, and the sampling rate can be determined according to the actual needs of those skilled in the art or users when actually taking pictures. This is not limited.

Step 103, performing preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing;

In the embodiment of the present invention, since the second image has lower pixel values than the first image, less power consumption and shorter time are consumed when the second image is subsequently processed.

For example, the second image can be beautified, or the second image can be blurred. Compared with directly performing each process or blurring on the first image with a higher pixel value, it takes less time. short. Of course, it is also possible to perform beautification and blur processing on the second image at the same time according to actual needs, which is not limited in this embodiment.

It should be noted that the beautification and/or blur processing has little influence on the pixel value of the image. That is to say, the pixel values of the third image obtained after beautifying and/or blurring the second image have little change.

For example, if the second image is an image with 500W pixels, then the pixel value of the third image after beautification and/or blur processing should also be around 500W.

Step 104, performing interpolation processing on the third image to generate a target image, where the difference between the pixel values of the target image and the pixel values of the first image is smaller than a preset threshold.

In the embodiment of the present invention, before the beautification and/or blurring process is performed on the image, the image is down-sampled to reduce the pixel value of the image. Therefore, after the beautification and/or blurring process is completed , you can continue to perform interpolation processing on the third image to obtain the target image.

Interpolating (Interpolating), also known as upsampling (Upsampling), is to use the gray value of the known adjacent pixels (or the three-color value in the RGB image) to generate the gray value of the unknown pixel, so as to reproduce it from the original image. Images with higher resolution.

In the embodiment of the present invention, the difference between the pixel value of the interpolated target image and the pixel value of the first image may be smaller than a preset threshold. Those skilled in the art may determine the specific value of the preset threshold according to actual needs, which is not limited in this embodiment.

In a specific implementation, in order to obtain a target image having almost the same pixel value as that of the first image, a smaller preset threshold may be set as much as possible.

For example, if the first image is 2000W, if you want the pixel value of the target image to be close to 2000W after beautification and/or blur processing, you can set a smaller preset threshold, so that the lower pixel value After interpolation processing is performed on the third image, a target image with a higher pixel value can be obtained.

In the embodiment of the present invention, after the first image captured by the camera is acquired, the first image is not directly processed for beautification, blurring, etc., but the first image is processed into a second image with a lower pixel value by down-sampling. second image, and then perform beautification, blurring and other processing on the second image, and then through interpolation processing, restore the third image to the target image with original pixel values, which improves the efficiency of beautification and blurring processing and reduces the processing time , reducing the power consumption when taking pictures.

Referring to FIG. 2 , it shows a flowchart of steps of another image processing method according to an embodiment of the present invention, which may specifically include the following steps:

Step 201, receiving at least two first images processed by the image signal processing unit ISP, the first images are images in YUV format collected by the camera and processed by the ISP;

In the embodiment of the present invention, after the camera of the mobile terminal collects images, it can output data through two sensors, and after being processed by the image signal processing unit ISP, two images in YUV format can be obtained.

It should be noted that the pixel values of the two YUV format images may be the same as the pixel values that can be captured by the camera of the mobile terminal.

For example, if the camera of the mobile terminal is a 2000W camera, the pixel values of the two obtained two images in YUV format may also be 2000W.

Step 202, determine the sampling rate of downsampling, and the sampling rate of downsampling matches the target pixel value;

In this embodiment of the present invention, the target pixel values may refer to pixel values of two second images obtained after downsampling the two first images in YUV format.

For example, if the pixel value of two first images in YUV format is 2000W, and the pixel value of the image obtained by downsampling the first image determined by the user is 500W, then the target pixel value is 500W.

In the embodiment of the present invention, the sampling rate of downsampling may match the target pixel value. That is, the second image with the target pixel value can be obtained by processing the first image with a certain sampling rate.

Step 203, performing downsampling processing on the first image according to the downsampling sampling rate to generate a second image with the target pixel value;

In the embodiment of the present invention, after the downsampling sampling rate is determined, downsampling can be performed according to the sampling rate, so as to obtain the second image and reduce the pixel value of the first image.

Step 204, performing preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing;

In the embodiment of the present invention, after the second image with a lower pixel value is obtained, beautification and/or blur processing may be performed on the second image.

In a specific implementation, it is possible to first identify the face areas in at least two second images, then determine the beautification parameters of the face areas, and use the beautification parameters to perform beautification processing on the face areas to generate a third image .

Alternatively, the depth of field information may be calculated according to at least two second images, and then the second image may be blurred according to the depth of field information to generate a third image.

In an example of the present invention, it is also possible to perform beautification processing on two second images first, and then perform blurring processing on the images after beautification processing, and use the image after both beautification and blurring processing as the first Three images.

It should be noted that the beautification and blur processing does not affect the pixel value of the original image. Therefore, the difference between the pixel values of the third image and the pixel values of the second image should be smaller than a preset threshold.

Step 205, performing interpolation processing on the third image to generate a target image, where the difference between the pixel values of the target image and the pixel values of the first image is smaller than a preset threshold.

In the embodiment of the present invention, before the beautification and/or blurring process is performed on the image, the image is down-sampled to reduce the pixel value of the image. Therefore, after the beautification and/or blurring process is completed , the third image can be continuously interpolated to restore the third image with a lower pixel value to a target image with a higher pixel value.

In the embodiment of the present invention, by determining the sampling rate of downsampling, the captured first image can be processed into a second image with a lower pixel value, and then the second image is processed by beautification, blurring, etc., reducing the The processing time for the mobile terminal to perform beautification, blurring, and other processing on the image; after completing the beautification, blurring, and other processing, the third image with a lower pixel value can be restored to a lower pixel value by interpolation processing. The target image with high pixel value matches the user's original shooting requirements.

It should be noted that, for the method embodiment, for the sake of simple description, it is expressed as a series of action combinations, but those skilled in the art should know that the embodiment of the present invention is not limited by the described action sequence, because According to the embodiment of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

Referring to FIG. 3 , it shows a structural block diagram of an image processing device according to an embodiment of the present invention. The device 300 may specifically include the following modules:

An acquisition module 310, configured to acquire the first image collected by the camera;

A down-sampling module 320, configured to perform down-sampling processing on the first image to generate a second image;

The preset processing module 330 is configured to perform preset processing on the second image to generate a third image, and the preset processing includes beautification processing and/or blurring processing;

The interpolation module 340 is configured to perform interpolation processing on the third image to generate a target image, and the difference between the pixel values of the target image and the pixel values of the first image is smaller than a preset threshold.

In the embodiment of the present invention, the down-sampling module 320 may specifically include the following submodules:

The sampling rate determination submodule is used to determine the sampling rate of the downsampling, and the sampling rate of the downsampling matches the target pixel value;

The down-sampling sub-module is configured to perform down-sampling processing on the first image according to the down-sampling sampling rate to generate a second image with the target pixel value.

In the embodiment of the present invention, the acquiring module 310 may specifically include the following submodules:

The receiving sub-module is used to receive at least two first images processed by the image signal processing unit ISP, and the first images are images in YUV format collected by the camera and processed by the ISP.

In the embodiment of the present invention, the second image may include at least two images, and the preset processing module 330 may specifically include the following submodules:

An identification submodule, configured to identify the face area in the at least two second images;

A parameter determination submodule, configured to determine the beautifying parameters of the face area;

The beautification sub-module is configured to use the beautification parameters to perform beautification processing on the face area to generate a third image.

In the embodiment of the present invention, the second image may include at least two images, and the preset processing module 330 may also include the following submodules:

A calculation submodule, configured to calculate the depth of field size information according to the at least two second images;

The blur sub-module is configured to perform blur processing on the second image according to the depth of field size information to generate a third image.

The device 300 can implement various processes implemented by the mobile terminal in the method embodiments in FIG. 1 to FIG. 2 , and details are not repeated here to avoid repetition. In the embodiment of the present invention, after the first image captured by the camera is acquired, the first image is not directly processed for beautification, blurring, etc., but the first image is processed into a second image with a lower pixel value by down-sampling, Then, the second image is processed by beautification and blurring, and then through interpolation processing, the third image is restored to the target image of the original pixel value, which improves the efficiency of beautification and blurring, reduces processing time, and reduces Power consumption when taking pictures.

Referring to FIG. 4 , it shows a schematic diagram of the hardware structure of a mobile terminal implementing various embodiments of the present invention. The mobile terminal 400 includes but is not limited to: a radio frequency unit 401, a network module 402, an audio output unit 403, an input unit 404, and a sensor 405 , a display unit 406 , a user input unit 407 , an interface unit 408 , a memory 409 , a processor 410 , and a power supply 411 and other components. Those skilled in the art can understand that the structure of the mobile terminal shown in Figure 4 does not constitute a limitation on the mobile terminal, and the mobile terminal may include more or less components than shown in the figure, or combine some components, or different components layout. In the embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted terminal, a wearable device, and a pedometer.

Wherein, the radio frequency unit 401 is used to receive and obtain the first image collected by the camera;

The processor 410 is configured to perform down-sampling processing on the first image to generate a second image; perform preset processing on the second image to generate a third image, and the preset processing includes beautification processing and/or Blurring processing: performing interpolation processing on the third image to generate a target image, where a difference between a pixel value of the target image and a pixel value of the first image is smaller than a preset threshold.

In this way, in the embodiment of the present invention, after the first image captured by the camera is acquired, the first image is not directly processed for beautification, blurring, etc., but the first image is processed to a lower pixel value by down-sampling The second image, and then perform beautification, blurring and other processing on the second image, and then through interpolation processing, the third image is restored to the target image with original pixel values, which improves the efficiency of beautification and blurring processing, and reduces the Processing time, reducing power consumption when taking pictures.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 401 can be used for receiving and sending signals during sending and receiving information or during a call. Specifically, the downlink data from the base station is received and processed by the processor 410; Uplink data is sent to the base station. Generally, the radio frequency unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 401 can also communicate with the network and other devices through a wireless communication system.

The mobile terminal provides users with wireless broadband Internet access through the network module 402, such as helping users send and receive emails, browse web pages, and access streaming media.

The audio output unit 403 may convert audio data received by the radio frequency unit 401 or the network module 402 or stored in the memory 409 into an audio signal and output as sound. Also, the audio output unit 403 can also provide audio output related to a specific function performed by the mobile terminal 400 (eg, call signal reception sound, message reception sound, etc.). The audio output unit 403 includes a speaker, a buzzer, a receiver, and the like.

The input unit 404 is used for receiving audio or video signals. The input unit 404 can include a graphics processing unit (Graphics Processing Unit, GPU) 4041 and a microphone 4042, and the graphics processing unit 4041 is used for still pictures or video images obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The data is processed. The processed image frames may be displayed on the display unit 406 . The image frames processed by the graphics processor 4041 may be stored in the memory 409 (or other storage media) or sent via the radio frequency unit 401 or the network module 402 . The microphone 4042 can receive sound, and can process such sound into audio data. The processed audio data can be converted into a format that can be sent to a mobile communication base station via the radio frequency unit 401 for output in the case of a phone call mode.

The mobile terminal 400 also includes at least one sensor 405, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 4061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 4061 and the display panel 4061 when the mobile terminal 400 moves to the ear / or backlighting. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is still, and can be used to identify the posture of mobile terminals (such as horizontal and vertical screen switching, related games, etc.) , magnetometer posture calibration), vibration recognition-related functions (such as pedometer, knocking), etc.; the sensor 405 can also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, Infrared sensors, etc., will not be repeated here.

The display unit 406 is used to display information input by the user or information provided to the user. The display unit 406 may include a display panel 4061, and the display panel 4061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an organic light-emitting diode (Organic Light-Emitting Diode, OLED), or the like.

The user input unit 407 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the mobile terminal. Specifically, the user input unit 407 includes a touch panel 4071 and other input devices 4072 . The touch panel 4071, also referred to as a touch screen, can collect touch operations of the user on or near it (for example, the user uses any suitable object or accessory such as a finger or a stylus on the touch panel 4071 or near the touch panel 4071). operate). The touch panel 4071 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, and 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 sends it to the For the processor 410, receive the command sent by the processor 410 and execute it. In addition, the touch panel 4071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 4071 , the user input unit 407 may also include other input devices 4072 . Specifically, other input devices 4072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

Furthermore, the touch panel 4071 can be covered on the display panel 4061, and when the touch panel 4071 detects a touch operation on or near it, it will be sent to the processor 410 to determine the type of the touch event, and then the processor 410 will The type of event provides a corresponding visual output on the display panel 4061 . Although in FIG. 4, the touch panel 4071 and the display panel 4061 are used as two independent components to realize the input and output functions of the mobile terminal, in some embodiments, the touch panel 4071 and the display panel 4061 can be integrated. The implementation of the input and output functions of the mobile terminal is not specifically limited here.

The interface unit 408 is an interface for connecting an external device to the mobile terminal 400 . For example, an external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 408 can be used to receive input from an external device (for example, data information, power, etc.) transfer data between devices.

The memory 409 can be used to store software programs as well as various data. The memory 409 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of mobile phones (such as audio data, phonebook, etc.), etc. In addition, the memory 409 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The processor 410 is the control center of the mobile terminal, which uses various interfaces and lines to connect various parts of the entire mobile terminal, by running or executing software programs and/or modules stored in the memory 409, and calling data stored in the memory 409 , execute various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole. The processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 410 .

The mobile terminal 400 can also include a power supply 411 (such as a battery) for supplying power to various components. Preferably, the power supply 411 can be logically connected to the processor 410 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. and other functions.

In addition, the mobile terminal 400 includes some functional modules not shown, which will not be repeated here.

Preferably, the embodiment of the present invention also provides a mobile terminal, including a processor 410, a memory 409, a computer program stored in the memory 409 and operable on the processor 410, when the computer program is executed by the processor 410 Each process of the embodiment of the above image processing method can achieve the same technical effect. To avoid repetition, details are not repeated here.

An embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned image processing method embodiment can be achieved, and the same Technical effects, in order to avoid repetition, will not be repeated here. Wherein, the computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, and the like.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, without departing from the gist of the present invention and the protection scope of the claims, many forms can also be made, all of which belong to the protection of the present invention.

Claims (12)

1. A method for image processing, applied to a mobile terminal, is characterized in that, comprising: Obtain the first image collected by the camera; performing downsampling processing on the first image to generate a second image; performing preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing; Interpolation processing is performed on the third image to generate a target image, and a difference between a pixel value of the target image and a pixel value of the first image is smaller than a preset threshold. 2. The method according to claim 1, wherein the step of performing downsampling processing on the first image to generate a second image comprises: determining a sampling rate for downsampling that matches the target pixel value; Perform downsampling processing on the first image according to the downsampling sampling rate to generate a second image with the target pixel value. 3. The method according to claim 1 or 2, wherein the step of obtaining the first image collected by the camera comprises: At least two first images processed by the image signal processing unit ISP are received, and the first images are images in YUV format collected by the camera and processed by the ISP. 4. The method according to claim 3, wherein the second image comprises at least two, and the step of performing preset processing on the second image to generate a third image comprises: identifying areas of faces in the at least two second images; Determining the beautification parameters of the face area; Using the beautification parameters, perform beautification processing on the face area to generate a third image. 5. The method according to claim 3, wherein the second image comprises at least two, and the step of performing preset processing on the second image to generate a third image comprises: calculating depth of field information according to the at least two second images; Perform blurring processing on the second image according to the depth-of-field size information to generate a third image. 6. An image processing device applied to a mobile terminal, characterized in that it comprises: An acquisition module, configured to acquire the first image collected by the camera; A downsampling module, configured to downsample the first image to generate a second image; A preset processing module, configured to perform preset processing on the second image to generate a third image, where the preset processing includes beautification processing and/or blurring processing; The interpolation module is configured to perform interpolation processing on the third image to generate a target image, and the difference between the pixel values of the target image and the pixel values of the first image is smaller than a preset threshold. 7. The device according to claim 6, wherein the downsampling module comprises: The sampling rate determination submodule is used to determine the sampling rate of the downsampling, and the sampling rate of the downsampling matches the target pixel value; The down-sampling sub-module is configured to perform down-sampling processing on the first image according to the down-sampling sampling rate to generate a second image with the target pixel value. 8. The device according to claim 6 or 7, wherein the acquisition module comprises: The receiving sub-module is used to receive at least two first images processed by the image signal processing unit ISP, the first images are images in YUV format collected by the camera and processed by the ISP. 9. The device according to claim 8, wherein the second image comprises at least two images, and the preset processing module comprises: An identification submodule, configured to identify the face area in the at least two second images; A parameter determination submodule, configured to determine the beautifying parameters of the face area; The beautification sub-module is configured to use the beautification parameters to perform beautification processing on the face area to generate a third image. 10. The device according to claim 8, wherein the second image comprises at least two images, and the preset processing module comprises: A calculation submodule, configured to calculate the depth of field size information according to the at least two second images; The blur sub-module is configured to perform blur processing on the second image according to the depth of field size information to generate a third image. 11. A mobile terminal, characterized by comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, when the computer program is executed by the processor, the The steps of the image processing method described in any one of claims 1 to 5. 12. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the image according to any one of claims 1 to 5 is realized The steps of the method of processing.