CN107592471A - A kind of high dynamic range images image pickup method and mobile terminal - Google Patents

Abstract

The present invention provides a high dynamic range image shooting method and a mobile terminal. The method includes: obtaining a preview image collected by a camera; dividing the preview image into N sub-regions; obtaining exposure parameters of each sub-region; Exposure parameters corresponding to the area determine the exposure image corresponding to each sub-area; perform image synthesis processing on the exposure images corresponding to all sub-areas, and output a high dynamic range image; wherein, N is an integer greater than 1. This can effectively improve the shooting effect of high dynamic range images.

Description

A high dynamic range image shooting method and mobile terminal

technical field

The invention relates to the field of communication technology, in particular to a high dynamic range image shooting method and a mobile terminal.

Background technique

With the development of communication technology, mobile terminals such as mobile phones and tablet computers have become indispensable tools in people's daily life. In order to meet the requirements of the shooting function of mobile terminals, high-dynamic range (High-Dynamic Range, HDR) image capture technology is gradually applied to mobile terminals, and mobile terminals can capture long-exposure, short-exposure and normal-exposure photos respectively through the camera. , and synthesize multiple captured photos to obtain an HDR image, and the synthesized HDR image has a more balanced exposure effect, thereby improving the shooting effect of the mobile terminal.

At present, in the process of shooting in the HDR shooting mode, the exposure parameters are generally determined by means of center-weighted photometry, and the exposure parameters of each frame of image are valid for the entire frame. However, since the brightness information of the whole picture itself is different, exposing with the same exposure parameters will result in overexposure or underexposure in some areas of the picture, thereby degrading the shooting quality of the photo. It can be seen that, during the exposure processing of the preview image by the exposure parameters of the existing HDR shooting mode, the image after exposure processing may partially have the problem of overexposure or underexposure.

Contents of the invention

Embodiments of the present invention provide a high dynamic range image shooting method and a mobile terminal to solve the problem of partial overexposure or underexposure of the image after exposure processing during the exposure processing of the preview image in the exposure parameters of the existing HDR shooting mode. exposed problem.

In order to solve the above technical problems, the present invention is implemented as follows: a high dynamic range image shooting method, applied to a mobile terminal including a camera, comprising: acquiring a preview image collected by the camera; dividing the preview image into N sub-regions; Acquire the exposure parameters of each sub-region; determine the exposure image corresponding to each sub-region based on the exposure parameters corresponding to each sub-region; perform image synthesis processing on the exposure images corresponding to all sub-regions, and output a high dynamic range image; wherein, N is an integer greater than 1.

In the first aspect, an embodiment of the present invention provides a high dynamic range image shooting method, which is applied to a mobile terminal including a camera, including:

Obtain the preview image collected by the camera;

Divide the preview image into N sub-regions;

Obtain the exposure parameters of each sub-region;

determining an exposure image corresponding to each sub-area based on the exposure parameters corresponding to each sub-area;

Perform image synthesis processing on the exposure images corresponding to all sub-regions, and output a high dynamic range image;

Wherein, N is an integer greater than 1.

In the second aspect, the embodiment of the present invention also provides a mobile terminal, including a camera, and the mobile terminal further includes:

The first obtaining module is used to obtain the preview image collected by the camera;

A division module, configured to divide the preview image into N sub-regions;

The second obtaining module is used to obtain the exposure parameters of each sub-region;

A determining module, configured to determine an exposure image corresponding to each sub-region based on the exposure parameters corresponding to each sub-region;

A synthesis module, configured to perform image synthesis processing on exposure images corresponding to all sub-regions, and output a high dynamic range image;

Wherein, N is an integer greater than 1.

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 The steps of realizing the above-mentioned high dynamic range image capturing method at the same time.

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-mentioned high dynamic range image capture method are implemented .

In the embodiment of the present invention, by dividing the preview image into N sub-regions, obtaining the exposure parameters of each sub-region, and using the corresponding exposure parameters of each sub-region to perform exposure processing on the preview image respectively, it is possible to obtain the The initial exposure image of each initial exposure image, and the image corresponding to its corresponding sub-region in each initial exposure image is determined as the exposure image corresponding to the sub-region, and the exposure images corresponding to all sub-regions are spliced and synthesized to obtain a preview image high dynamic range images. Compared with the prior art, the high dynamic range image synthesized in this way is clearer and more real, which effectively improves the shooting effect of the high dynamic range image.

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 based on these drawings without any creative effort.

FIG. 1 is a flowchart of a high dynamic range image capturing method provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of division of preview image sub-regions provided by the present invention;

Fig. 3 is a flowchart of a high dynamic range image capturing method provided by another embodiment of the present invention;

FIG. 4 is a structural diagram of a mobile terminal provided by an embodiment of the present invention;

Fig. 5 is a structural diagram of a determination module in a mobile terminal provided by an embodiment of the present invention;

FIG. 6 is a structural diagram of an exposure submodule in a mobile terminal provided by an embodiment of the present invention;

Fig. 7 is one of the structural diagrams of the dividing module in the mobile terminal provided by an embodiment of the present invention;

Fig. 8 is one of the structural diagrams of the second acquisition module in the mobile terminal provided by an embodiment of the present invention;

FIG. 9 is the second structural diagram of the dividing module in the mobile terminal provided by an embodiment of the present invention;

Fig. 10 is the second structural diagram of the second acquiring module in the mobile terminal provided by an embodiment of the present invention;

Fig. 11 is a structural diagram of a mobile terminal provided by another embodiment of the present invention.

detailed description

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, FIG. 1 is a flowchart of a high dynamic range image capturing method provided by an embodiment of the present invention, which is applied to a mobile terminal including a camera, as shown in FIG. 1, including the following steps:

Step 101, acquiring a preview image captured by a camera.

In this step, start the camera application program to obtain the preview image captured by the camera.

Step 102. Divide the preview image into N sub-regions.

In this step, if a shooting instruction is received in the HDR shooting mode, the preview image is divided into N sub-regions, where N is an integer greater than 1.

Wherein, the division of sub-regions can be performed according to division rules preset by the user, or can be divided according to shooting scenes. As shown in FIG. 2 , for example, when the lightness and darkness of the preview image are different in various orientations in the space plane, the preview image can be divided into four sub-regions ABCD with the same size according to the orientation division rule.

Step 103, acquiring exposure parameters of each sub-region.

In this step, the exposure parameter of each sub-region can be obtained by calculating the photometry of each sub-region according to the photometry result.

Step 104, based on the exposure parameters corresponding to each sub-region, determine an exposure image corresponding to each sub-region.

In this step, exposure processing may be performed on the preview image by using the exposure parameters corresponding to each sub-region, so as to obtain the exposure image corresponding to each sub-region.

Step 105 , performing image composition processing on the exposure images corresponding to all sub-regions, and outputting a high dynamic range image.

In this step, the exposure images corresponding to all sub-regions obtained in step 104 are spliced and synthesized to obtain a high dynamic range image of the preview image, and the high dynamic range image is output.

At present, in the process of shooting in the HDR shooting mode, center-weighted metering is performed on the entire preview image, and the exposure parameters of the entire preview image are determined according to the metering results of the center-weighted metering; however, due to the There may be areas with different brightness and darkness in the image. Using the same exposure parameter to expose the preview image will result in overexposed and underexposed areas in the exposed image, resulting in poor quality of photos taken in HDR shooting mode. The problem.

In this embodiment, by dividing the preview image into N sub-areas, obtaining the exposure parameters of each sub-area, and using the exposure parameters corresponding to each sub-area to perform exposure processing on the preview image respectively, the exposure corresponding to each sub-area can be obtained. The initial exposure image, and the image corresponding to the corresponding sub-region in each initial exposure image is determined as the exposure image corresponding to the sub-region, and the exposure images corresponding to all sub-regions are spliced and synthesized to obtain the preview image. High dynamic range images. Compared with the prior art, the high dynamic range image synthesized in this way is clearer and more real, which effectively improves the shooting effect of the high dynamic range image.

It should be noted that the finer the division of sub-regions, the better the effect of the synthesized high dynamic range image; however, when the number of sub-regions is too large, the calculation amount of the mobile terminal processor in the exposure process will be increased, thereby increasing the load of the mobile terminal. It affects other operations of the mobile terminal, so the number of sub-areas is generally set at 2 to 4. In this way, clearer and more realistic high dynamic range images can be output without increasing the load of the mobile terminal.

In the embodiment of the present invention, the above-mentioned mobile terminal can be any mobile terminal including a camera, for example: a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, PDA for short), Mobile internet device (Mobile Internet Device, MID) or wearable device (Wearable Device), etc.

In the high dynamic range image shooting method of the embodiment of the present invention, by obtaining the preview image collected by the camera; dividing the preview image into N sub-regions; obtaining the exposure parameters of each sub-region; based on the exposure parameters corresponding to each sub-region, Determine the exposure image corresponding to each sub-region; perform image synthesis processing on the exposure images corresponding to all sub-regions, and output a high dynamic range image; wherein, N is an integer greater than 1. This can effectively improve the shooting effect of high dynamic range images.

Referring to FIG. 3, FIG. 3 is a flowchart of a high dynamic range image capturing method provided by another embodiment of the present invention, as shown in FIG. 3, including the following steps:

Step 301, acquire a preview image captured by a camera.

In this step, start the camera application program to obtain the preview image captured by the camera.

Step 302. Divide the preview image into N sub-regions.

In this step, if a shooting instruction is received in the HDR shooting mode, the preview image is divided into N sub-regions, where N is an integer greater than 1.

Optionally, in step 302, the preview image may be divided into N sub-regions based on the distribution of the preview image on a spatial plane.

In this embodiment, based on the distribution of the preview image on the spatial plane, the process of dividing the preview image into N sub-regions may be divided according to a division rule preset by the user, or may be divided according to the shooting scene. As shown in FIG. 2 , for example, when the lightness and darkness of the preview image are different in various orientations in the space plane, the preview image can be divided into four sub-regions ABCD with the same size according to the orientation division rule.

Optionally, step 302 may further include: performing scene detection on the preview image to obtain a scene detection result; and dividing the preview image into N sub-regions according to the scene detection result.

In this embodiment, the shooting scene can be divided into sub-regions. For example, when it is detected that the upper (1/3) part of the preview image needs to be overexposed, and the remaining part is normally exposed, the preview image can be divided into two sub-regions. One of the sub-regions corresponds to the upper (1/3) part of the image, and the other sub-region corresponds to the lower (2/3) part of the image.

Further optionally, in step 302, the preview image may also be divided into N sub-regions based on the brightness value of each pixel in the preview image; wherein each sub-region corresponds to a brightness value interval.

In this implementation manner, the preview image may be divided into N sub-regions according to the brightness value of each pixel in the preview image. Since the sub-regions are divided according to the brightness value, the sub-regions divided in this way have no obvious boundary division, but each pixel is divided into different groups according to the brightness value, and different sub-regions are formed. .

A specific application of this embodiment is to first obtain the brightness value of each pixel in the preview image; then, classify all pixels whose brightness value is less than the first preset brightness value into the first group, and the first group All the pixels in the second group form the first sub-area; all the pixels whose brightness value is greater than the second preset brightness are classified into the second group, and all the pixels in the second group form the second sub-area; the brightness value is in the second sub-area All pixels between a preset brightness value and a second preset brightness value are classified into a third group, and all pixels in the third group form a third sub-region.

By dividing the sub-regions according to the luminance value of each pixel, exposure parameters that better match each sub-region can be obtained, so as to obtain a more realistic exposure image, so as to further improve the shooting effect of high dynamic range images.

Step 303, acquiring exposure parameters of each sub-region.

In this step, the exposure parameter of each sub-region can be obtained by calculating the photometry of each sub-region according to the photometry result.

Specifically, a photometric result of each sub-region may be obtained by performing center-weighted photometry on each sub-region; and an exposure parameter of each sub-region may be calculated according to the photometric result of each sub-region. This approach is mainly used to divide sub-regions by spatial planes.

The photometry result of each sub-region may also be obtained by performing spot metering on each sub-region; and the exposure parameter of each sub-region is calculated according to the photometry result of each sub-region. This method is mainly used to divide sub-regions by the brightness value of pixels.

Step 304: Perform exposure processing on the preview image respectively according to the exposure parameters corresponding to each sub-region, to obtain an initial exposure image corresponding to each sub-region.

In this step, the initial exposure image corresponding to each sub-region can be obtained by performing exposure processing on the preview image according to the exposure parameters corresponding to each sub-region.

Optionally, the number of cameras is M, and M is an integer greater than 1; step 304 may also include: determining the target sub-area corresponding to each camera according to the size relationship between M and N; For the corresponding target sub-area, determine the target exposure parameters corresponding to each camera; control all cameras to perform exposure processing on the preview image respectively according to their corresponding target exposure parameters, and obtain an initial exposure image corresponding to each sub-area; wherein, Each camera corresponds to S target sub-areas, each camera corresponds to S target exposure parameters, and S is an integer greater than 0.

In this embodiment, when the number of cameras is two or more, the target sub-area corresponding to each camera can be determined according to the size relationship between the number M of cameras and the number N of sub-areas, and according to the corresponding Determine the target exposure parameters corresponding to each camera, and control all cameras to perform exposure processing on the preview image according to their corresponding target exposure parameters, so as to obtain the initial exposure image corresponding to each sub-region. Compared with a mobile terminal with only one camera, in the process of exposing the preview image, the camera needs to be controlled to sequentially use the exposure parameters corresponding to each sub-region to perform exposure processing on the preview image, which can effectively save the exposure processing time. Improve exposure efficiency.

For example, as shown in Figure 2, the preview image is divided into four sub-regions of equal size ABCD, and the time required for each exposure processing is set as t. For a mobile terminal with only one camera, it takes 4t time to complete Use the exposure parameters corresponding to the four sub-areas of ABCD to process the exposure of the preview image. For a mobile terminal including a first camera and a second camera, by setting the first camera to correspond to the AC sub-area, and correlating the exposure parameters corresponding to the AC sub-area; Exposure parameters; in the process of controlling the first camera and the second camera to expose the preview image, you can first control the first camera to use the exposure parameters corresponding to the A sub-area and the second camera to use the exposure parameters corresponding to the B sub-area. The image is exposed, and then the first camera is controlled to use the exposure parameters corresponding to the C sub-area and the second camera is used to use the exposure parameters corresponding to the D sub-area to simultaneously expose the preview image, so that the total exposure time required is 2t. Compared with the first method, half of the exposure time can be saved, which effectively improves the exposure efficiency.

Step 305 , for each sub-region, determine an image of the same region as the sub-region in the corresponding initial exposure image as the exposure image of the sub-region.

In this step, after the initial exposure image corresponding to each sub-region is obtained, for each sub-region, an image of the same region as the sub-region in the corresponding initial exposure image may be determined as the exposure image of the sub-region.

Specifically, for example, using the first exposure parameters corresponding to the first sub-region to perform exposure processing on the preview image, the first initial exposure image can be obtained, and the image corresponding to the first sub-region in the initial exposure image is used as the exposure of the first sub-region image.

Step 306 , performing image composition processing on the exposure images corresponding to all sub-regions, and outputting a high dynamic range image.

In this step, the exposure images corresponding to all sub-regions obtained in step 305 are spliced and synthesized to obtain a high dynamic range image of the preview image, and the high dynamic range image is output.

In this embodiment, by dividing the preview image into N sub-areas, obtaining the exposure parameters of each sub-area, and using the exposure parameters corresponding to each sub-area to perform exposure processing on the preview image respectively, the exposure corresponding to each sub-area can be obtained. The initial exposure image, and the image corresponding to the corresponding sub-region in each initial exposure image is determined as the exposure image corresponding to the sub-region, and the exposure images corresponding to all sub-regions are spliced and synthesized to obtain the preview image. High dynamic range images. Compared with the prior art, the high dynamic range image synthesized in this way is clearer and more real, which effectively improves the shooting effect of the high dynamic range image.

In the high dynamic range image shooting method of the embodiment of the present invention, the preview image collected by the camera is obtained; the preview image is divided into N sub-regions; the exposure parameters of each sub-region are obtained; according to the exposure parameters corresponding to each sub-region, Perform exposure processing on the preview image respectively to obtain an initial exposure image corresponding to each sub-area; for each sub-area, determine an image of the same area as the sub-area in the corresponding initial exposure image as the exposure of the sub-area image; performing image synthesis processing on exposure images corresponding to all sub-regions, and outputting a high dynamic range image; wherein, N is an integer greater than 1. This can effectively improve the shooting effect of high dynamic range images.

Referring to FIG. 4, FIG. 4 is a structural diagram of a mobile terminal provided by an embodiment of the present invention. As shown in FIG. Two acquisition modules 403, a determination module 404 and a synthesis module 405, wherein the first acquisition module 401 is connected to the division module 402, the division module 402 is also connected to the second acquisition module 403, and the second acquisition module 403 is also connected to the determination module 404, The determination module 404 is also connected with the synthesis module 405:

The first obtaining module 401 is used to obtain the preview image collected by the camera;

A division module 402, configured to divide the preview image into N sub-regions;

The second obtaining module 403 is used to obtain the exposure parameters of each sub-region;

A determining module 404, configured to determine an exposure image corresponding to each sub-region based on the exposure parameters corresponding to each sub-region;

A synthesis module 405, configured to perform image synthesis processing on the exposure images corresponding to all sub-regions, and output a high dynamic range image;

Wherein, N is an integer greater than 1.

Optionally, as shown in FIG. 5, the determining module 404 includes:

The exposure sub-module 4041 is configured to respectively perform exposure processing on the preview image according to the exposure parameters corresponding to each sub-region, so as to obtain an initial exposure image corresponding to each sub-region;

The first determination sub-module 4042 is configured to, for each sub-region, determine an image of the same region as the sub-region in the corresponding initial exposure image as the exposure image of the sub-region.

Optionally, the number of the cameras is M, and M is an integer greater than 1; as shown in FIG. 6, the exposure submodule 4041 includes:

The first determination unit 40411 is configured to determine the target sub-area corresponding to each camera according to the size relationship between M and N;

The second determining unit 40412 is configured to determine a target exposure parameter corresponding to each camera according to the target sub-area corresponding to each camera;

The exposure unit 40413 is configured to control all the cameras to respectively perform exposure processing on the preview image according to their corresponding target exposure parameters, so as to obtain an initial exposure image corresponding to each sub-region;

Wherein, each camera corresponds to S target sub-areas, each camera corresponds to S target exposure parameters, and S is an integer greater than 0.

Optionally, the division module 402 is specifically configured to divide the preview image into N sub-regions based on the distribution of the preview image on a spatial plane.

Optionally, as shown in FIG. 7, the dividing module 402 includes:

The detection sub-module 4021 is configured to perform scene detection on the preview image to obtain a scene detection result;

The first division sub-module 4022 is configured to divide the preview image into N sub-regions according to the scene detection result.

Optionally, as shown in FIG. 8, the second obtaining module 403 includes:

The first photometry sub-module 4031 is configured to perform center-weighted photometry on each sub-region, and obtain a photometry result of each sub-region;

The second determination sub-module 4032 is configured to determine the exposure parameter of each sub-region according to the photometry result of each sub-region.

Optionally, the division module 402 is specifically configured to divide the preview image into N sub-regions based on the brightness value of each pixel in the preview image;

Wherein, each sub-region corresponds to a brightness value interval.

Optionally, as shown in FIG. 9, the dividing module 402 includes:

Obtaining sub-module 4023, configured to obtain the brightness value of each pixel in the preview image;

The second dividing sub-module 4024 is used to divide all pixels whose luminance value is less than the first preset luminance value into the first sub-region;

The third dividing sub-module 4025 is used to divide all pixels whose luminance value is greater than the second preset luminance value into the second sub-region;

The fourth dividing sub-module 4026 is configured to divide all pixels whose luminance values are between the first preset luminance value and the second preset luminance value into third sub-regions.

Optionally, as shown in FIG. 10, the second acquiring module 403 includes:

The second photometry sub-module 4033 is configured to perform spot photometry on each sub-region, and obtain a photometry result of each sub-region;

The third determination sub-module 4034 is configured to determine the exposure parameters of each sub-area according to the photometry results of each sub-area.

The mobile terminal 400 can implement various processes implemented by the mobile terminal in the method embodiments shown in FIG. 1 to FIG. 3 , and details will not be repeated here to avoid repetition.

The mobile terminal 400 of the embodiment of the present invention obtains the preview image collected by the camera; divides the preview image into N sub-regions; obtains the exposure parameters of each sub-region; Exposure images corresponding to the regions; performing image synthesis processing on the exposure images corresponding to all sub-regions, and outputting high dynamic range images; wherein, N is an integer greater than 1. This can effectively improve the shooting effect of high dynamic range images.

Fig. 11 is a structural diagram of a mobile terminal provided by another embodiment of the present invention. As shown in Fig. 11, the mobile terminal 1100 includes but not limited to: a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, and a sensor 1105 , a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, a processor 1110, a power supply 1111, a camera 1112 and other components. Those skilled in the art can understand that the structure of the mobile terminal shown in Figure 11 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 processor 1110 is used to obtain a preview image collected by the camera; divide the preview image into N sub-regions; obtain the exposure parameters of each sub-region; determine the corresponding The exposure images of all sub-regions are subjected to image synthesis processing to output high dynamic range images; wherein, N is an integer greater than 1.

Optionally, the processor 1110 is further configured to: respectively perform exposure processing on the preview image according to the exposure parameters corresponding to each sub-region to obtain an initial exposure image corresponding to each sub-region; for each sub-region, Determining an image of the same area as the sub-area in the corresponding initial exposure image as the exposure image of the sub-area.

Optionally, the number of the cameras is M, and M is an integer greater than 1;

The processor 1110 is further configured to: determine the target sub-area corresponding to each camera according to the size relationship between M and N; determine the target exposure parameter corresponding to each camera according to the target sub-area corresponding to each camera; All cameras respectively perform exposure processing on the preview image according to their corresponding target exposure parameters to obtain an initial exposure image corresponding to each sub-region; wherein, each camera corresponds to S target sub-regions, and each camera corresponds to S targets Exposure parameter, and S is an integer greater than 0.

Optionally, the processor 1110 is further configured to: divide the preview image into N subregions based on the distribution of the preview image on a spatial plane.

Optionally, the processor 1110 is further configured to: perform scene detection on the preview image to obtain a scene detection result; divide the preview image into N subregions according to the scene detection result.

Optionally, the processor 1110 is further configured to: perform center-weighted photometry on each sub-region to obtain a photometry result of each sub-region; determine an exposure parameter of each sub-region according to the photometry result of each sub-region .

Optionally, the processor 1110 is further configured to: divide the preview image into N subregions based on the brightness value of each pixel in the preview image; wherein each subregion corresponds to a brightness value interval.

Optionally, the processor 1110 is further configured to: obtain the brightness value of each pixel in the preview image; divide all pixels whose brightness values are less than a first preset brightness value into a first sub-region; divide the brightness All pixels whose values are greater than the second preset brightness value are divided into the second sub-region; all pixels whose brightness value is between the first preset brightness value and the second preset brightness value are divided into the third sub-region.

Optionally, the processor 1110 is further configured to: perform spot metering on each sub-region to obtain a photometry result of each sub-region; determine an exposure parameter of each sub-region according to the photometry result of each sub-region.

The mobile terminal 1100 is capable of implementing various processes implemented by the mobile terminal in the foregoing embodiments, and details are not repeated here to avoid repetition.

The mobile terminal 1100 of the embodiment of the present invention obtains the preview image collected by the camera; divides the preview image into N sub-regions; obtains the exposure parameters of each sub-region; Exposure images corresponding to the regions; performing image synthesis processing on the exposure images corresponding to all sub-regions, and outputting high dynamic range images; wherein, N is an integer greater than 1. This can effectively improve the shooting effect of high dynamic range images.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 1101 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 1110; Uplink data is sent to the base station. Generally, the radio frequency unit 1101 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 1101 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 1102, such as helping users send and receive emails, browse web pages, and access streaming media.

The audio output unit 1103 may convert audio data received by the radio frequency unit 1101 or the network module 1102 or stored in the memory 1109 into an audio signal and output as sound. Also, the audio output unit 1103 can also provide audio output related to a specific function performed by the mobile terminal 1100 (for example, call signal reception sound, message reception sound, etc.). The audio output unit 1103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1104 is used to receive audio or video signals. The input unit 1104 may include a graphics processor (Graphics Processing Unit, GPU) 11041 and a microphone 11042, and the graphics processor 11041 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 1106 . The image frames processed by the graphics processor 11041 may be stored in the memory 1109 (or other storage medium) or sent via the radio frequency unit 1101 or the network module 1102 . The microphone 11042 can receive sound, and can process such sound into audio data. The processed audio data may be converted into a format transmittable to a mobile communication base station via the radio frequency unit 1101 for output in the case of a phone call mode.

The mobile terminal 1100 also includes at least one sensor 1105, 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 11061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 11061 and the / 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 1105 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 1106 is used to display information input by the user or information provided to the user. The display unit 1106 may include a display panel 11061, and the display panel 11061 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 1107 can be used to receive input number or character information, and generate key signal input related to user settings and function control of the mobile terminal. Specifically, the user input unit 1107 includes a touch panel 11071 and other input devices 11072 . The touch panel 11071, 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 and a stylus on the touch panel 11071 or near the touch panel 11071 operate). The touch panel 11071 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 1110, receive the command sent by the processor 1110 and execute it. In addition, the touch panel 11071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 11071 , the user input unit 1107 may also include other input devices 11072 . Specifically, other input devices 11072 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 11071 can be covered on the display panel 11061, and when the touch panel 11071 detects a touch operation on or near it, it will be sent to the processor 1110 to determine the type of the touch event, and then the processor 1110 will The type of event provides a corresponding visual output on the display panel 11061. Although in FIG. 11, the touch panel 11071 and the display panel 11061 are used as two independent components to realize the input and output functions of the mobile terminal, in some embodiments, the touch panel 11071 and the display panel 11061 can be integrated. The implementation of the input and output functions of the mobile terminal is not specifically limited here.

The interface unit 1108 is an interface for connecting an external device to the mobile terminal 1100 . 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 1108 can be used to receive input from an external device (for example, data information, power, etc.) transfer data between devices.

The memory 1109 can be used to store software programs as well as various data. The memory 1109 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 1109 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 1110 is the control center of the mobile terminal, which uses various interfaces and lines to connect various parts of the entire mobile terminal, runs or executes software programs and/or modules stored in the memory 1109, and calls data stored in the memory 1109 , execute various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole. The processor 1110 may include one or more processing units; preferably, the processor 1110 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 1110 .

The mobile terminal 1100 can also include a power supply 1111 (such as a battery) for supplying power to various components. Preferably, the power supply 1111 can be logically connected to the processor 1110 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 1100 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 1110, a memory 1109, a computer program stored in the memory 1109 and operable on the processor 1110, when the computer program is executed by the processor 1110 Each process of the above embodiment of the high dynamic range image capturing method can be realized, and the same technical effect can be achieved, so in order to avoid repetition, details are not repeated here.

The embodiment of the present invention also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, each process of the above-mentioned high dynamic range image capture method embodiment is realized, and can achieve The same technical effects are not repeated here to avoid repetition. 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. Those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, all of which belong to the protection of the present invention.

Claims (20)

1. A high dynamic range image capturing method, applied to a mobile terminal comprising a camera, characterized in that, comprising: Obtain the preview image collected by the camera; Divide the preview image into N sub-regions; Obtain the exposure parameters of each sub-region; determining an exposure image corresponding to each sub-area based on the exposure parameters corresponding to each sub-area; Perform image synthesis processing on the exposure images corresponding to all sub-regions, and output a high dynamic range image; Wherein, N is an integer greater than 1. 2. The method according to claim 1, wherein the step of determining the exposure image corresponding to each sub-region based on the exposure parameters corresponding to each sub-region comprises: performing exposure processing on the preview image respectively according to the exposure parameters corresponding to each sub-area to obtain an initial exposure image corresponding to each sub-area; For each sub-region, an image of the same region as the sub-region in the corresponding initial exposure image is determined as the exposure image of the sub-region. 3. The method according to claim 2, wherein the number of the cameras is M, and M is an integer greater than 1; The step of performing exposure processing on the preview image respectively according to the exposure parameters corresponding to each sub-region to obtain an initial exposure image corresponding to each sub-region includes: Determine the target sub-area corresponding to each camera according to the size relationship between M and N; According to the target sub-area corresponding to each camera, determine the target exposure parameters corresponding to each camera; Controlling all cameras to perform exposure processing on the preview image respectively according to their corresponding target exposure parameters, to obtain an initial exposure image corresponding to each sub-region; Wherein, each camera corresponds to S target sub-areas, each camera corresponds to S target exposure parameters, and S is an integer greater than 0. 4. The method according to any one of claims 1 to 3, wherein the step of dividing the preview image into N subregions comprises: Based on the distribution of the preview image on a spatial plane, divide the preview image into N sub-regions. 5. The method according to any one of claims 1 to 3, wherein the step of dividing the preview image into N sub-regions comprises: Scene detection is performed on the preview image to obtain a scene detection result; According to the scene detection result, the preview image is divided into N sub-regions. 6. The method according to claim 4, wherein the step of obtaining the exposure parameters of each sub-region comprises: Perform center-weighted photometry on each sub-area to obtain the photometry result of each sub-area; According to the light metering result of each sub-area, the exposure parameter of each sub-area is determined. 7. The method according to any one of claims 1 to 3, wherein the step of dividing the preview image into N sub-regions comprises: Divide the preview image into N sub-regions based on the brightness value of each pixel in the preview image; Wherein, each sub-region corresponds to a brightness value interval. 8. The method according to claim 7, wherein the step of dividing the preview image into N sub-regions based on the brightness value of each pixel in the preview image comprises: Obtain the brightness value of each pixel in the preview image; Divide all pixels whose luminance values are less than a first preset luminance value into first sub-regions; dividing all pixels whose luminance values are greater than a second preset luminance value into second sub-regions; All pixels whose luminance values are between the first preset luminance value and the second preset luminance value are divided into a third sub-region. 9. The method according to claim 7, wherein the step of obtaining the exposure parameters of each sub-region comprises: Perform spot metering on each sub-area to obtain the photometry results of each sub-area; According to the light metering result of each sub-area, the exposure parameter of each sub-area is determined. 10. A mobile terminal, comprising a camera, characterized in that the mobile terminal also comprises: The first obtaining module is used to obtain the preview image collected by the camera; A division module, configured to divide the preview image into N sub-regions; The second obtaining module is used to obtain the exposure parameters of each sub-region; A determining module, configured to determine an exposure image corresponding to each sub-region based on the exposure parameters corresponding to each sub-region; A synthesis module, configured to perform image synthesis processing on exposure images corresponding to all sub-regions, and output a high dynamic range image; Wherein, N is an integer greater than 1. 11. The mobile terminal according to claim 10, wherein the determining module comprises: The exposure sub-module is configured to respectively perform exposure processing on the preview image according to the exposure parameters corresponding to each sub-region, so as to obtain an initial exposure image corresponding to each sub-region; The first determining sub-module is configured to, for each sub-region, determine an image of the same region as the sub-region in the corresponding initial exposure image as the exposure image of the sub-region. 12. The mobile terminal according to claim 11, wherein the number of the cameras is M, and M is an integer greater than 1; The exposure submodule includes: The first determination unit is used to determine the target sub-area corresponding to each camera according to the size relationship between M and N; The second determining unit is configured to determine a target exposure parameter corresponding to each camera according to the target sub-area corresponding to each camera; an exposure unit, configured to control all the cameras to perform exposure processing on the preview image respectively according to their corresponding target exposure parameters, to obtain an initial exposure image corresponding to each sub-region; Wherein, each camera corresponds to S target sub-areas, each camera corresponds to S target exposure parameters, and S is an integer greater than 0. 13. The mobile terminal according to any one of claims 10 to 12, wherein the division module is specifically configured to divide the preview image into N subsections based on the distribution of the preview image on a spatial plane. area. 14. The mobile terminal according to any one of claims 10 to 12, wherein the dividing module comprises: The detection sub-module is used to perform scene detection on the preview image to obtain a scene detection result; The first dividing sub-module is used to divide the preview image into N sub-regions according to the scene detection result. 15. The mobile terminal according to claim 13, wherein the second acquiring module comprises: The first photometry sub-module is configured to perform center-weighted photometry on each sub-region, and obtain a photometry result of each sub-region; The second determination sub-module is configured to determine the exposure parameters of each sub-area according to the photometry results of each sub-area. 16. The mobile terminal according to any one of claims 10 to 12, wherein the dividing module is specifically configured to divide the preview image based on the brightness value of each pixel in the preview image into N sub-regions; Wherein, each sub-region corresponds to a brightness value interval. 17. The mobile terminal according to claim 16, wherein the dividing module comprises: An acquisition submodule, configured to acquire the brightness value of each pixel in the preview image; The second dividing sub-module is used to divide all pixels whose luminance value is less than the first preset luminance value into the first sub-region; The third dividing sub-module is used to divide all pixels whose luminance value is greater than the second preset luminance value into the second sub-region; The fourth dividing sub-module is used to divide all pixels whose luminance values are between the first preset luminance value and the second preset luminance value into third sub-regions. 18. The mobile terminal according to claim 16, wherein the second acquiring module comprises: The second photometry sub-module is used to perform spot metering on each sub-area to obtain a photometry result of each sub-area; The third determination sub-module is configured to determine the exposure parameters of each sub-region according to the photometry result of each sub-region. 19. A mobile terminal, characterized in that it includes 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 following The steps of the high dynamic range image capturing method described in any one of claims 1 to 9. 20. 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 method according to any one of claims 1 to 9 is realized. Steps of a high dynamic range image capture method.