CN107197169B - high dynamic range image shooting method and mobile terminal - Google Patents
high dynamic range image shooting method and mobile terminal Download PDFInfo
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- CN107197169B CN107197169B CN201710480243.3A CN201710480243A CN107197169B CN 107197169 B CN107197169 B CN 107197169B CN 201710480243 A CN201710480243 A CN 201710480243A CN 107197169 B CN107197169 B CN 107197169B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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Abstract
The invention provides a high dynamic range image shooting method and a mobile terminal, wherein the method comprises the following steps: acquiring a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. According to the high dynamic range image shooting method provided by the embodiment of the invention, the time difference between the photos for synthesizing the HDR image can be avoided by the mobile terminal, so that the occurrence of double images or residual images is reduced, and the quality of the photos shot by the mobile terminal is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a high dynamic range image shooting method and a mobile terminal.
Background
with the development of communication technology, mobile terminals such as mobile phones and tablet computers have become indispensable tools in daily life of people. In order to meet the requirements of the photographing function of the mobile terminal, a High-Dynamic Range (HDR) image photographing technology is gradually applied to the mobile terminal, the mobile terminal can capture long-exposure, short-exposure and normal-exposure pictures through a camera, and synthesize the captured multiple pictures to obtain an HDR image, and the synthesized HDR image has a more balanced exposure effect, so that the quality of the pictures photographed by the mobile terminal is improved.
however, in the process of taking a picture by using the HDR technology, because the mobile terminal has a time difference of two or three frames when continuously capturing two pictures, if the mobile terminal is in motion or an object to be taken is in motion, images of the two continuously captured pictures change, so that a ghost image or an afterimage phenomenon exists in the synthesized HDR image, thereby reducing the quality of the picture taken by the mobile terminal. Therefore, the current mobile terminal has the problem of low picture quality caused by serious ghost images or afterimages in the photographing process.
Disclosure of Invention
the embodiment of the invention provides a high dynamic range image shooting method and a mobile terminal, and aims to solve the problem of low picture quality caused by serious ghost images or afterimages in the shooting process of the mobile terminal.
In a first aspect, an embodiment of the present invention provides a high dynamic range image shooting method, which is applied to a mobile terminal with a first camera and a second camera arranged on a single side, and the method includes:
Acquiring a first preview image acquired by a first camera;
determining a foreground image area and a background image area in the first preview image;
If a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera;
Performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image;
the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area.
in a second aspect, an embodiment of the present invention further provides a mobile terminal, where a first camera and a second camera are disposed on a single side of the mobile terminal, and the mobile terminal further includes:
The first image acquisition module is used for acquiring a first preview image acquired by the first camera;
The area determining module is used for determining a foreground image area and a background image area in the first preview image acquired by the first image acquiring module;
The second image acquisition module is used for respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera if a photographing instruction is received;
The synthesis module is used for carrying out image synthesis processing on the second preview image and the third preview image acquired by the second image acquisition module and outputting a high dynamic range image;
the second preview image is an image exposed to the foreground image area determined by the area determining module, and the third preview image is an image exposed to the background image area determined by the area determining module.
In a third aspect, an embodiment of the present invention further provides a mobile terminal, where a first camera and a second camera are disposed on a single side of the mobile terminal, the mobile terminal further includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the steps of the high dynamic range image capturing method are implemented.
in a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the above-mentioned high dynamic range image capturing method.
In this way, in the embodiment of the present invention, a first preview image acquired by a first camera is acquired; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. The mobile terminal can avoid the time difference between the photos for synthesizing the HDR image, thereby reducing the occurrence of double images or residual images and improving the quality of the photos shot by the mobile terminal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flowchart of a high dynamic range image capture method provided by an embodiment of the present invention;
FIG. 2 is a second flowchart of a high dynamic range image capturing method according to an embodiment of the present invention;
FIG. 3 is a third flowchart of a high dynamic range image capturing method according to an embodiment of the present invention;
Fig. 4 is one of the structural diagrams of a mobile terminal according to an embodiment of the present invention;
Fig. 5 is one of the structural diagrams of an area determination module in a mobile terminal according to an embodiment of the present invention;
Fig. 6 is a second block diagram of a region determination module in a mobile terminal according to an embodiment of the present invention;
Fig. 7 is a block diagram of a background area determination unit in a mobile terminal according to an embodiment of the present invention;
Fig. 8 is a second block diagram of a mobile terminal according to an embodiment of the present invention;
fig. 9 is a third block diagram of a mobile terminal according to an embodiment of the present invention;
fig. 10 is a fourth structural diagram of a mobile terminal according to an embodiment of the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a high dynamic range image capturing method provided in an embodiment of the present invention, and is applied to a mobile terminal having a first camera and a second camera on a single side, as shown in fig. 1, the method includes:
Step 101, acquiring a first preview image acquired by a first camera.
in the embodiment of the invention, if the camera application program of the mobile terminal is started and the first camera of the mobile terminal is in an image preview state, the mobile terminal can acquire the image acquired by the first camera as the first preview image.
And 102, determining a foreground image area and a background image area in the first preview image.
in this embodiment of the present invention, when the first preview image is acquired in step 101, the mobile terminal may determine a foreground image area and a background image area in the first preview image.
the determining of the foreground image area and the background image area in the first preview image may be, for example, to respectively use two different image areas specified in advance in the first preview image as the foreground image area and the background image area: a certain fixed image area in the first preview image can be designated in advance as a foreground image area, and an image area other than the foreground image area is designated as a background image area; alternatively, a partial image region other than the foreground image region may be set as the background image region.
Step 103, if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
In the embodiment of the present invention, if the foreground image area and the background image area in the first preview image are determined in step 102, when the mobile terminal receives a photographing instruction, the mobile terminal may simultaneously control the first camera to acquire the second preview image, and the second camera acquires the third preview image, so that the acquired second preview image and the acquired third preview image are the same frame image, thereby reducing or even avoiding ghost images or afterimages in the synthesized HDR image.
The mobile terminal can control the first camera to expose the acquired image by taking the foreground image area as a reference exposure point and control the first camera to capture the exposed image as a second preview image when the first camera acquires the second preview image and the second camera acquires the third preview image; the mobile terminal controls the second camera to expose the acquired image by taking the background image area as a reference exposure point, and controls the second camera to capture the exposed image as a third preview image, so that the exposure reference points of the second preview image and the third preview image are different, and the quality of the synthesized HDR image is improved. The first camera and the second camera may both use an Automatic Exposure (AE) technique to respectively expose the foreground image area and the background image area.
It should be noted that the first camera and the second camera are disposed on the same side of the mobile terminal, for example: the first camera and the second camera can form a front double camera or a rear double camera of the mobile terminal. In addition, in order to ensure that the synthesized HDR image is not distorted, the focal lengths, the angles of view, and the like of the first camera and the second camera tend to be consistent, and the sizes and the shooting objects of the image captured by the first camera and the image captured by the second camera can be kept consistent.
And 104, performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image.
In the embodiment of the present invention, if the second preview image and the third preview image are obtained in step 103, the mobile terminal may combine the second preview image and the third preview image, and during the process of combining the images, the mobile terminal may perform image registration, exposure combination, tone mapping, and the like on the second preview image and the third preview image, so as to combine the HDR image with high quality.
In this embodiment of the present invention, the mobile terminal may be any mobile terminal having a first camera and a second camera on one side, for example: mobile terminals such as Mobile phones, Tablet Personal computers (Tablet Personal computers), Laptop computers (Laptop computers), Personal Digital Assistants (PDAs), Mobile Internet Devices (MIDs), and Wearable devices (Wearable devices).
in the embodiment of the invention, a first preview image acquired by a first camera is acquired; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. The mobile terminal can avoid the time difference between the photos for synthesizing the HDR image, thereby reducing the occurrence of double images or residual images and improving the quality of the photos shot by the mobile terminal.
referring to fig. 2, fig. 2 is a flowchart of a high dynamic range image capturing method according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
Step 201, acquiring a first preview image acquired by a first camera.
step 202, performing face recognition on the first preview image to obtain a face image area.
In the embodiment of the present invention, if the first preview image is obtained in step 201, the mobile terminal may identify the face image in the first preview image by using a face identification technology, so as to obtain a face image area, that is, an area where the face image in the first preview image is located. The above-mentioned face recognition technology is well known to those skilled in the art, and will not be described herein again.
Step 203, determining the face image area as a foreground image area.
in the embodiment of the present invention, if the face image region is obtained in step 202, the mobile terminal may determine that the face image region is a foreground image region.
and step 204, determining a background image area based on the foreground image area.
In the embodiment of the present invention, if the foreground image area is determined in step 203, the mobile terminal may determine any area in the first preview image, except the face image area, as the background image area according to a preset rule. For example: the area of the first preview image except the face image area can be used as a background image area; or randomly determining a partial area as the background image area in an image area of the first preview image except the face image area.
optionally, step 204 may include: acquiring a Y-channel image of the first preview image; taking the pixel blocks of m × n as unit pixel blocks, and performing image segmentation on all image areas except the foreground image area in the Y-channel image to obtain T pixel blocks; for each pixel block in the T pixel blocks, calculating the brightness and the value of all pixel points in each pixel block; and determining the image area where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values is located as a background image area.
in this embodiment, the mobile terminal may divide an image area other than the foreground image area in the first preview image into a plurality of pixel blocks of a preset size, and determine an image area where a pixel block with the maximum brightness and value is located among the plurality of pixel blocks as a background image area, so that when the mobile terminal controls the second camera to expose the background image area to obtain a third preset image, the image area where the pixel block with the maximum brightness and value is located is used as an exposure reference point, which may make the exposure effect of the synthesized HDR image better, and further improve the quality of the HDR image.
wherein the Y-channel image is an image including image data in YUV ("Y" represents a gray value; "U" and "V" represent a chroma) format. Of course, the first preview image may also be an image including image data in other formats, and the mobile terminal may convert the format of the image data of the first preview image to obtain a Y-channel image of the first preview image, for example: if the first preview image is an image including image data in RGB (Red, Green, Blue) format, the mobile terminal may convert the image data from RGB format to YUV format, thereby obtaining a Y-channel image of the first preview image.
Step 205, if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
In the embodiment of the present invention, if the foreground image area and the background image area in the first preview image are determined in step 204, when the mobile terminal receives a photographing instruction, the mobile terminal may simultaneously control the first camera to acquire the second preview image, and the second camera acquires the third preview image, so that the acquired second preview image and the acquired third preview image are the same frame image, thereby reducing or even avoiding ghost images or afterimages in the synthesized HDR image.
optionally, before step 205, the method may further include: respectively performing photometry on the foreground image area and the background image area to respectively obtain a first exposure value of the foreground image area and a second exposure value of the background image area; the step 205 may include: and if the first exposure value is different from the second exposure value, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
in this embodiment, when the camera application of the mobile terminal is turned on, and if the foreground image area and the background image area are determined in step 204, the mobile terminal may perform photometry on the foreground image area and the background image area of the first preset image, and if exposure values of the foreground image area and the background image area are different, it is determined that the HDR function needs to be turned on when the mobile terminal takes a picture, and when a shooting instruction is received, the mobile terminal may control the first camera to acquire the second preview image and the second camera to acquire the third preview image, and synthesize the HDR image by using the second preview image and the third preview image, thereby improving quality of a picture taken by the mobile terminal.
It should be noted that, if the exposure values of the foreground image area and the background image area are the same, the photo taken by the mobile terminal through the single camera may have higher image quality, and the mobile terminal may control the first camera to acquire the image and output the image acquired by the first camera as the photo, so that the battery power and the storage resource of the mobile terminal may be saved.
And step 206, performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image.
In the embodiment of the invention, a face image area is obtained by carrying out face recognition on the first preview image; determining the face image area as a foreground image area; based on the foreground image region, a background image region is determined. Therefore, when the shot picture comprises the face image, the mobile terminal can determine the foreground image area and the background image area through the face image area, the exposure effect of the synthesized HDR image can be improved, and the image quality of the HDR image is improved.
Referring to fig. 3, fig. 3 is a flowchart of a high dynamic range image capturing method according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
step 301, acquiring a first preview image acquired by a first camera.
step 302, obtaining depth data of the first preview image, where the depth data includes a depth value of each pixel point.
In the embodiment of the present invention, if the first preview image is obtained in step 301, the mobile terminal may obtain depth data of the first preview image. The depth data of the first preview image may be a depth value of each pixel point in the first preview image detected by the mobile terminal through a distance detection component, such as an infrared emitter, on the mobile terminal when the first camera acquires the first preview image.
And step 303, acquiring a minimum depth value v0 in the depth data.
in this embodiment of the present invention, if the depth data of the first preview image is obtained in step 302, the mobile terminal may compare the depth value of each pixel point in the first preview image, so as to obtain the minimum depth value v0 in the depth data.
And 304, determining a set of pixel points with the depth values within the range of v0 to (v0+ v1) as a foreground image area based on the minimum depth value v 0.
in the embodiment of the present invention, when the first camera acquires the first preview image, the closer the distance between the object to be photographed and the first camera is, the smaller the depth value of the pixel point of the image corresponding to the object to be photographed in the first preview image is, and the depth values of the pixel points in the image corresponding to the same object to be photographed are usually closer, and the mobile terminal determines the set of the pixel points whose depth values are within the range from v0 to (v0+ v1) as the foreground image area, so that the image area of the image corresponding to the object to be photographed that is close to the first camera in the first preview image can be used as the foreground image area, and the mobile terminal can select a proper foreground image area, so that the exposure effect of the synthesized HDR image is better.
Step 305, determining a background image area based on the foreground image area.
in this embodiment of the present invention, in the step 304, the foreground image area is determined, and the mobile terminal may determine, according to a preset rule, any area of the first preview image except the foreground image area as the background image area.
Optionally, the step 305 may include: acquiring a Y-channel image of the first preview image; taking the pixel blocks of m × n as unit pixel blocks, and performing image segmentation on all image areas except the foreground image area in the Y-channel image to obtain T pixel blocks; for each pixel block in the T pixel blocks, calculating the brightness and the value of all pixel points in each pixel block; and determining the image area where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values is located as a background image area.
In this embodiment, the mobile terminal may divide an image region other than the face image region in the first preview image into a plurality of pixel blocks of a preset size, and determine an image region where a pixel block with the maximum brightness and value is located among the plurality of pixel blocks as a background image region, so that when the mobile terminal controls the second camera to expose the background image region to obtain a third preset image, the image region where the pixel block with the maximum brightness and value is located is used as an exposure reference point, which may make the exposure effect of the synthesized HDR image better, and further improve the quality of the HDR image.
And step 306, if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
in the embodiment of the present invention, if the foreground image area and the background image area in the first preview image are determined in step 305, when the mobile terminal receives a photographing instruction, the mobile terminal may simultaneously control the first camera to acquire the second preview image, and the second camera acquires the third preview image, so that the acquired second preview image and the acquired third preview image are the same frame image, thereby reducing or even avoiding ghost images or afterimages in the synthesized HDR image.
Optionally, before step 306, the method may further include: respectively performing photometry on the foreground image area and the background image area to respectively obtain a first exposure value of the foreground image area and a second exposure value of the background image area; the step 306 may include: if the first exposure value is different from the second exposure value, the second preview image collected by the first camera and the third preview image collected by the second camera are respectively obtained, so that the HDR function can be automatically and timely started by the mobile terminal, the quality of pictures shot by the mobile terminal is improved, and meanwhile, the waste of battery power and storage resources is avoided.
And 307, performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image.
In the embodiment of the invention, the depth data of the first preview image is obtained, and the depth data comprises the depth value of each pixel point; acquiring a minimum depth value v0 in the depth data; based on the minimum depth value v0, determining a set of pixel points with the depth values in the range of v0 to (v0+ v1) as a foreground image area; based on the foreground image region, a background image region is determined. In this way, the mobile terminal can determine a foreground image area and a background image area according to the depth data of the image, so as to respectively expose the images acquired by the first camera and the second camera according to the foreground image area and the background image area, thereby improving the exposure effect of the synthesized HDR image and further improving the image quality of the HDR image.
Referring to fig. 4, fig. 4 is a structural diagram of a mobile terminal according to an embodiment of the present invention, a first camera and a second camera are disposed on a single side of the mobile terminal 400, and as shown in fig. 4, the mobile terminal 400 includes a first image obtaining module 401, an area determining module 402, a second image obtaining module 403, and a synthesizing module 404, which are connected in sequence:
A first image obtaining module 401, configured to obtain a first preview image acquired by a first camera;
a region determining module 402, configured to determine a foreground image region and a background image region in the first preview image acquired by the first image acquiring module 401;
A second image obtaining module 403, configured to obtain a second preview image acquired by the first camera and a third preview image acquired by the second camera if a photographing instruction is received;
A synthesizing module 404, configured to perform image synthesis processing on the second preview image and the third preview image acquired by the second image acquiring module, and output a high dynamic range image;
the second preview image is an image exposed to the foreground image area determined by the area determining module 402, and the third preview image is an image exposed to the background image area determined by the area determining module 402.
Optionally, as shown in fig. 5, the region determining module 402 may include:
A face recognition unit 4021, configured to perform face recognition on the first preview image acquired by the first image acquisition module 401 to obtain a face image region;
a first foreground region determining unit 4022, configured to determine a face image region identified by the face identifying unit 4021 as a foreground image region;
a background region determining unit 4023, configured to determine a background image region based on the foreground image region determined by the first foreground region determining unit 4022.
optionally, as shown in fig. 6, the region determining module 402 may include:
a depth data obtaining unit 4024, configured to obtain depth data of the first preview image obtained by the first image obtaining module 401, where the depth data includes a depth value of each pixel;
a minimum depth value obtaining unit 4025, configured to obtain a minimum depth value v0 in the depth data obtained by the depth data obtaining unit 4024;
A second foreground region determining unit 4026, configured to determine, as a foreground image region, a set of pixel points whose depth values range from v0 to (v0+ v1) based on the minimum depth value v0 acquired by the minimum depth value acquiring unit 4025;
A background region determining unit 4027, configured to determine a background image region based on the foreground image region determined by the second foreground region determining unit 4026;
wherein v1 is a preset threshold value.
Optionally, as shown in fig. 7, the background region determining unit 4027 may include:
a Y channel image obtaining subunit 40271, configured to obtain a Y channel image of the first preview image obtained by the first image obtaining module 401;
a pixel block division subunit 40272, configured to perform image division on all image regions, except the foreground image region, in the Y channel image acquired by the Y channel image acquisition subunit 40271, using m × n pixel blocks as unit pixel blocks, to obtain T pixel blocks;
A luminance sum value operator unit 40273, configured to calculate, for each pixel block of the T pixel blocks obtained by the pixel block segmentation subunit 40272, the luminance sum value of all pixel points in each pixel block;
A background region determining subunit 40274, configured to determine, as a background image region, an image region where a pixel block corresponding to the maximum luminance sum value of all the luminance sum values calculated by the luminance sum value operator unit 40273 is located.
Optionally, as shown in fig. 8, the mobile terminal 400 may further include:
a light metering module 405, configured to perform light metering on the foreground image area and the background image area determined by the area determining module 402, respectively, so as to obtain a first exposure value of the foreground image area and a second exposure value of the background image area, respectively;
The second image obtaining module 403 is further configured to obtain a second preview image collected by the first camera and a third preview image collected by the second camera respectively if the first exposure value and the second exposure value measured by the photometry module 405 are different.
The mobile terminal 400 can implement each process implemented by the mobile terminal in the embodiments of fig. 1 to fig. 3, and is not described herein again to avoid repetition.
The mobile terminal 400 of the embodiment of the present invention obtains a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. The mobile terminal can avoid the time difference between the photos for synthesizing the HDR image, thereby reducing the occurrence of double images or residual images and improving the quality of the photos shot by the mobile terminal.
The embodiment of the present invention further provides a mobile terminal, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program is executed by the processor to implement each process of the above-mentioned high dynamic range image shooting method embodiment, and can achieve the same technical effect, and is not described herein again to avoid repetition.
the 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 computer program implements each process of the above-mentioned high dynamic range image shooting method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Referring to fig. 9, fig. 9 is a block diagram of a mobile terminal according to an embodiment of the present invention, and as shown in fig. 9, the mobile terminal 900 includes: at least one processor 901, memory 902, at least one network interface 904, and a user interface 903. Various components in mobile terminal 900 are coupled together by bus system 905. It is understood that the bus system 905 is used to enable communications among the components. The bus system 905 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. However, for clarity of illustration, the various buses are labeled as a bus system 905 in fig. 9, and the mobile terminal 900 further includes a first camera 906 and a second camera 907 disposed on a single side, the first camera 906 and the second camera 907 being connected to the various components of the mobile terminal through the bus system 905.
The user interface 903 may include, among other things, a display, a keyboard, or a pointing device (e.g., a mouse, trackball, touch pad, or touch screen, among others.
it is to be understood that the memory 902 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 902 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
in some embodiments, memory 902 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 9021 and application programs 9022.
The operating system 9021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is configured to implement various basic services and process hardware-based tasks. The application 9022 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing the method of an embodiment of the present invention may be included in application 9022.
in this embodiment of the present invention, the mobile terminal 900 further includes: a computer program stored on the memory 902 and executable on the processor 901, in particular a computer program in the application 9022, which computer program, when executed by the processor 901, performs the steps of: acquiring a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area.
The method disclosed in the above embodiments of the present invention may be applied to the processor 901, or implemented by the processor 901. The processor 901 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 901. The Processor 901 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. 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 connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may reside in ram, flash memory, rom, prom, or eprom, registers, among other computer-readable storage media known in the art. The computer readable storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902, and combines the hardware to complete the steps of the above method. Specifically, the computer-readable storage medium has stored thereon a computer program which, when executed by the processor 901, implements the steps of the high dynamic range image capturing method embodiments described above.
It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.
for a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.
optionally, the computer program when executed by the processor 901 may further implement the following steps: carrying out face recognition on the first preview image to obtain a face image area; determining the face image area as a foreground image area; based on the foreground image region, a background image region is determined.
Optionally, the computer program when executed by the processor 901 may further implement the following steps: acquiring depth data of the first preview image, wherein the depth data comprises a depth value of each pixel point; acquiring a minimum depth value v0 in the depth data; based on the minimum depth value v0, determining a set of pixel points with the depth values in the range of v0 to (v0+ v1) as a foreground image area; determining a background image region based on the foreground image region; wherein v1 is a preset threshold value.
Optionally, the computer program when executed by the processor 901 may further implement the following steps: acquiring a Y-channel image of the first preview image; taking the pixel blocks of m × n as unit pixel blocks, and performing image segmentation on all image areas except the foreground image area in the Y-channel image to obtain T pixel blocks; for each pixel block in the T pixel blocks, calculating the brightness and the value of all pixel points in each pixel block; and determining the image area where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values is located as a background image area.
Optionally, the computer program when executed by the processor 901 may further implement the following steps: respectively performing photometry on the foreground image area and the background image area to respectively obtain a first exposure value of the foreground image area and a second exposure value of the background image area; and if the first exposure value is different from the second exposure value, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
the mobile terminal 900 can implement the processes implemented by the mobile terminal in the foregoing embodiments, and in order to avoid repetition, the details are not described here.
the mobile terminal 900 of the embodiment of the present invention obtains a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. The mobile terminal can avoid the time difference between the photos for synthesizing the HDR image, thereby reducing the occurrence of double images or residual images and improving the quality of the photos shot by the mobile terminal.
Referring to fig. 10, fig. 10 is a structural diagram of a mobile terminal according to an embodiment of the present invention, which can implement details of the high dynamic range image capturing method in the embodiments of fig. 1 to fig. 3, and achieve the same effect. As shown in fig. 10, the mobile terminal 1000 includes a Radio Frequency (RF) circuit 1010, a memory 1020, an input unit 1030, a display unit 1040, a processor 1050, an audio circuit 1060, a communication module 1070, a power supply 1080, a first camera 1090, and a second camera 1100, the first camera 1090 and the second camera 1100 being disposed on the same side of the mobile terminal 1000.
The input unit 1030 may be used to receive numeric or character information input by a user and generate signal inputs related to user settings and function control of the mobile terminal 1000, among other things. Specifically, in the embodiment of the present invention, the input unit 1030 may include a touch panel 1031. The touch panel 1031, also referred to as a touch screen, may collect touch operations by a user (e.g., operations of the user on the touch panel 1031 by using any suitable object or accessory such as a finger or a stylus) thereon or nearby, and drive corresponding connection devices according to a preset program. Alternatively, the touch panel 1031 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts it to touch point coordinates, and sends the touch point coordinates to the processor 1050, and can receive and execute commands from the processor 1050. In addition, the touch panel 1031 may be implemented by various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1031, the input unit 1030 may also include other input devices 1032, and the other input devices 1032 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, a joystick, etc.
Among other things, the display unit 1040 may be used to display information input by a user or information provided to the user and various menu interfaces of the mobile terminal 1000. The display unit 1040 may include a display panel 1041, and optionally, the display panel 1041 may be configured in the form of an LCD or an Organic Light-Emitting Diode (OLED).
It should be noted that the touch panel 1031 may cover the display panel 1041 to form a touch display screen, and when the touch display screen detects a touch operation thereon or nearby, the touch display screen is transmitted to the processor 1050 to determine the type of the touch event, and then the processor 1050 provides a corresponding visual output on the touch display screen according to the type of the touch event.
The touch display screen comprises an application program interface display area and a common control display area. The arrangement modes of the application program interface display area and the common control display area are not limited, and can be an arrangement mode which can distinguish two display areas, such as vertical arrangement, left-right arrangement and the like. The application interface display area may be used to display an interface of an application. Each interface may contain at least one interface element such as an icon and/or widget desktop control for an application. The application interface display area may also be an empty interface that does not contain any content. The common control display area is used for displaying controls with high utilization rate, such as application icons like setting buttons, interface numbers, scroll bars, phone book icons and the like. The touch screen is a flexible screen, and the two surfaces of the flexible screen are both pasted with the organic transparent conductive films of the carbon nanotubes.
the processor 1050 is a control center of the mobile terminal 1000, connects various parts of the entire mobile phone by using various interfaces and lines, and performs various functions of the mobile terminal 1000 and processes data by running or executing software programs and/or modules stored in the first memory 1021 and calling data stored in the second memory 1022, thereby performing overall monitoring of the mobile terminal 1000. Optionally, the processor 1050 may include one or more processing units.
In the embodiment of the present invention, the mobile terminal further includes: a computer program stored in the first memory 1021 and executable on the processor 1050, the computer program when executed by the processor 1050 implementing the steps of: acquiring a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area.
Optionally, the computer program when executed by the processor 1050 may also implement the steps of: carrying out face recognition on the first preview image to obtain a face image area; determining the face image area as a foreground image area; based on the foreground image region, a background image region is determined.
Optionally, the computer program when executed by the processor 1050 may also implement the steps of: acquiring depth data of the first preview image, wherein the depth data comprises a depth value of each pixel point; acquiring a minimum depth value v0 in the depth data; based on the minimum depth value v0, determining a set of pixel points with the depth values in the range of v0 to (v0+ v1) as a foreground image area; determining a background image region based on the foreground image region; wherein v1 is a preset threshold value.
Optionally, the computer program when executed by the processor 1050 may also implement the steps of: acquiring a Y-channel image of the first preview image; taking the pixel blocks of m × n as unit pixel blocks, and performing image segmentation on all image areas except the foreground image area in the Y-channel image to obtain T pixel blocks; for each pixel block in the T pixel blocks, calculating the brightness and the value of all pixel points in each pixel block; and determining the image area where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values is located as a background image area.
Optionally, the computer program when executed by the processor 1050 may also implement the steps of: respectively performing photometry on the foreground image area and the background image area to respectively obtain a first exposure value of the foreground image area and a second exposure value of the background image area; and if the first exposure value is different from the second exposure value, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
the mobile terminal 1000 can implement the processes implemented by the mobile terminal in the foregoing embodiments, and details are not repeated here to avoid repetition.
the mobile terminal 1000 of the embodiment of the invention acquires a first preview image acquired by a first camera; determining a foreground image area and a background image area in the first preview image; if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera; performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image; the second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area. The mobile terminal can avoid the time difference between the photos for synthesizing the HDR image, thereby reducing the occurrence of double images or residual images and improving the quality of the photos shot by the mobile terminal.
those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the mobile terminal and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed mobile terminal and method may be implemented in other ways. For example, the above-described embodiments of the mobile terminal are merely illustrative, and for example, the division of a unit is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of the mobile terminals or units through some interfaces, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. a high dynamic range image shooting method is applied to a mobile terminal with a first camera and a second camera arranged on one side, and is characterized by comprising the following steps:
acquiring a first preview image acquired by a first camera;
Determining a foreground image area and a background image area in the first preview image;
if a photographing instruction is received, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera;
Performing image synthesis processing on the second preview image and the third preview image, and outputting a high dynamic range image;
The second preview image is an image exposed to the foreground image area, and the third preview image is an image exposed to the background image area;
The step of determining a foreground image region and a background image region in the first preview image comprises:
carrying out face recognition on the first preview image to obtain a face image area;
Determining the face image area as a foreground image area;
Determining a background image region based on the foreground image region;
the step of determining a background image area based on the foreground image area comprises:
Acquiring a Y-channel image of the first preview image;
taking the pixel blocks of m × n as unit pixel blocks, and performing image segmentation on all image areas except the foreground image area in the Y-channel image to obtain T pixel blocks;
for each pixel block in the T pixel blocks, calculating the brightness and the value of all pixel points in each pixel block;
And determining the image area where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values is located as a background image area.
2. The high dynamic range image capturing method according to claim 1, wherein the step of determining a foreground image area and a background image area in the first preview image includes:
Acquiring depth data of the first preview image, wherein the depth data comprises a depth value of each pixel point;
Acquiring a minimum depth value v0 in the depth data;
based on the minimum depth value v0, determining a set of pixel points with the depth values in the range of v0 to (v0+ v1) as a foreground image area;
Determining a background image region based on the foreground image region;
Wherein v1 is a preset threshold value.
3. The high dynamic range image capturing method according to claim 1 or 2, wherein the step of respectively acquiring the second preview image captured by the first camera and the third preview image captured by the second camera is preceded by the step of:
Respectively performing photometry on the foreground image area and the background image area to respectively obtain a first exposure value of the foreground image area and a second exposure value of the background image area;
the step of respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera comprises the following steps:
and if the first exposure value is different from the second exposure value, respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera.
4. the utility model provides a mobile terminal, mobile terminal's unilateral is provided with first camera and second camera, its characterized in that, mobile terminal still includes:
The first image acquisition module is used for acquiring a first preview image acquired by the first camera;
The area determining module is used for determining a foreground image area and a background image area in the first preview image acquired by the first image acquiring module;
The second image acquisition module is used for respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera if a photographing instruction is received;
the synthesis module is used for carrying out image synthesis processing on the second preview image and the third preview image acquired by the second image acquisition module and outputting a high dynamic range image;
The second preview image is an image exposing the foreground image area determined by the area determining module, and the third preview image is an image exposing the background image area determined by the area determining module;
the region determination module includes:
The face recognition unit is used for carrying out face recognition on the first preview image acquired by the first image acquisition module to obtain a face image area;
A first foreground region determining unit, configured to determine a face image region identified by the face identifying unit as a foreground image region;
a background region determining unit configured to determine a background image region based on the foreground image region determined by the first foreground region determining unit;
The background region determination unit includes:
a Y-channel image obtaining subunit, configured to obtain a Y-channel image of the first preview image obtained by the first image obtaining module;
a pixel block division subunit, configured to perform image division on all image regions, except the foreground image region, in the Y-channel image acquired by the Y-channel image acquisition subunit, using m × n pixel blocks as unit pixel blocks, to obtain T pixel blocks;
The brightness and value calculating operator unit is used for calculating the brightness and value of all pixel points in each pixel block for each pixel block in the T pixel blocks obtained by the pixel block dividing subunit;
and the background region determining subunit is used for determining the image region where the pixel block corresponding to the maximum brightness sum value in all the brightness sum values obtained by the brightness sum value operator unit is located as a background image region.
5. The mobile terminal of claim 4, wherein the zone determination module comprises:
the depth data acquisition unit is used for acquiring the depth data of the first preview image acquired by the first image acquisition module, wherein the depth data comprises the depth value of each pixel point;
a minimum depth value acquisition unit configured to acquire a minimum depth value v0 in the depth data acquired by the depth data acquisition unit;
a second foreground region determining unit, configured to determine, as a foreground image region, a set of pixel points whose depth values range from v0 to (v0+ v1) based on the minimum depth value v0 acquired by the minimum depth value acquiring unit;
A background region determining unit configured to determine a background image region based on the foreground image region determined by the second foreground region determining unit;
wherein v1 is a preset threshold value.
6. The mobile terminal according to claim 4 or 5, characterized in that the mobile terminal further comprises:
a photometry module, configured to perform photometry on the foreground image area and the background image area determined by the area determining module, respectively to obtain a first exposure value of the foreground image area and a second exposure value of the background image area, respectively;
the second image acquisition module is further used for respectively acquiring a second preview image acquired by the first camera and a third preview image acquired by the second camera if the first exposure value and the second exposure value measured by the photometry module are different.
7. a mobile terminal provided with a first camera and a second camera on one side, characterized in that the mobile terminal further comprises a processor, a memory, a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the high dynamic range image capturing method according to any one of claims 1 to 3.
8. a computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the high dynamic range image capturing method according to any one of claims 1 to 3.
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