CN107613191B - Photographing method, photographing equipment and computer readable storage medium - Google Patents
Photographing method, photographing equipment and computer readable storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a photographing method, which is applied to a mobile terminal and comprises the following steps: acquiring a photographing instruction; executing the photographing instruction, and measuring the light intensity value of the scene to be photographed by the mobile terminal based on the preset exposure parameter; determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy, wherein the second exposure parameter is different from the first exposure parameter; acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image; and after the preview image is previewed, photographing is carried out based on the second exposure parameter. The embodiment of the invention also discloses a photographing device and a computer readable storage medium.
Description
Technical Field
The present invention relates to the field of electronic devices, and in particular, to a photographing method, a photographing device, and a computer-readable storage medium.
Background
With the continuous development of scientific technology and electronic equipment, mobile terminals have become necessities in daily life of people, and photographing is an important function for current mobile terminals such as smart phones, tablet computers and the like, so that people can enjoy the convenience brought by the development of science and technology.
Currently, in the process of taking a picture by using a mobile terminal, the preview exposure time and the shooting exposure time are the same. Thus, in the case of dark external light, such as night scenes, rainy days, dim light environments, etc., if the exposure time is short, although the preview speed and the focusing speed are fast, the noise in the obtained image is larger, resulting in poor picture quality. However, if the exposure time is increased, the picture quality can be improved, but the preview speed and the focusing speed are too slow.
Therefore, the photographing method in the prior art is not reasonable enough.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a photographing method, a photographing apparatus, and a computer-readable storage medium to solve at least one problem in the prior art, so that when photographing, preview speed and focusing speed can be considered while image quality is ensured.
The technical scheme of the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a photographing method applied to a mobile terminal, where the method includes: acquiring a photographing instruction; executing the photographing instruction, and measuring the light intensity value of the scene to be photographed by the mobile terminal based on the preset exposure parameter; determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy, wherein the second exposure parameter is different from the first exposure parameter; acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image; and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
In a second aspect, an embodiment of the present invention provides a photographing apparatus, where the image capturing apparatus at least includes: the system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the steps of the photographing method when executing the program.
In a third aspect, an embodiment of the present invention 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 the steps of the above-mentioned photographing method.
According to the photographing method, the photographing device and the computer readable storage medium provided by the embodiment of the invention, after the mobile terminal obtains the photographing instruction, the mobile terminal can execute the photographing instruction, firstly, the light intensity value of a scene to be photographed by the mobile terminal is measured based on the preset exposure parameter, then, after the light intensity value is obtained, the mobile terminal can determine the first exposure parameter corresponding to the light intensity value and the second exposure parameter different from the first exposure parameter according to the light intensity value, finally, the image acquisition is carried out according to the first exposure parameter to obtain the preview image, the preview image is previewed, and after the preview image is previewed, photographing is carried out based on the second exposure parameter. Therefore, two different exposure parameters are set according to the light intensity value of the current shooting scene, and the accuracy of the exposure parameters can be improved; and then, the photographing process is completed through two different exposure parameters, so that the preview speed and the focusing speed can be considered while the image quality is ensured.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention;
FIG. 2 is a schematic flowchart of a photographing method according to a first embodiment of the present invention;
FIG. 3A is a diagram illustrating a system user interface according to a first embodiment of the invention;
fig. 3B is a schematic diagram of an interface of a camera application according to a first embodiment of the invention;
FIG. 4A is a first schematic diagram of a target image according to a first embodiment of the present invention;
FIG. 4B is a second schematic diagram of a target image according to the first embodiment of the invention;
FIG. 4C is a third schematic diagram of a target image according to the first embodiment of the invention;
FIG. 5 is a flowchart illustrating a photographing method according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a photographing apparatus in a third embodiment of the present invention.
Detailed Description
It should be understood that the embodiments described herein are only for explaining the technical solutions of the present invention, and are not intended to limit the scope of the present invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like, and a fixed terminal such as a Digital TV, a desktop computer, and the like.
The following description will be given by way of example of a mobile terminal, and it will be understood by those skilled in the art that the construction according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for mobile purposes.
Referring to fig. 1, which is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, the mobile terminal 100 may include: a Radio Frequency (RF) unit 101, a Wi-Fi (Wireless-Fidelity) module 102, an audio output unit 103, an audio/video (a/V) input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, a processor 110, and a power supply 111. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 1 is not intended to be limiting of mobile terminals, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
The following describes each component of the mobile terminal in detail with reference to fig. 1:
the radio frequency unit 101 may be configured to receive and transmit signals during information transmission and reception or during a call, and specifically, receive downlink information of a base station and then process the downlink information to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 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 101 can also communicate with a network and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to GSM, GPRS (General Packet Radio Service), CDMA2000, WCDMA, TD-SCDMA, FDD-LTE, TDD-LTE, etc.
Wi-Fi belongs to a short-distance wireless transmission technology, and a mobile terminal can help a user to receive and send emails, browse webpages, access streaming media and the like through a Wi-Fi module 102, and provides wireless broadband internet access for the user. Although fig. 1 shows the Wi-Fi module 102, it is understood that it does not belong to the essential constitution of the mobile terminal, and may be omitted entirely as needed within the scope not changing the essence of the invention.
The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the Wi-Fi module 102 or stored in the memory 109 into an audio signal and output as sound when the mobile terminal 100 is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, and the like.
The a/V input unit 104 is used to receive audio or video signals. The a/V input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, the Graphics processor 1041 Processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphics processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the Wi-Fi module 102. The microphone 1042 may receive sounds (audio data) via the microphone 1042 in a phone call mode, a recording mode, a voice recognition mode, or the like, and may be capable of processing such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.
The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the mobile terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.
The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 1071 (e.g., an operation performed by the user on or near the touch panel 1071 using a finger, a stylus, or any other suitable object or accessory), and drive a corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of 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 the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and can receive and execute commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. In particular, other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like, and are not limited to these specific examples.
Further, the touch panel 1071 may cover the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although the touch panel 1071 and the display panel 1061 are shown in fig. 1 as two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.
The interface unit 108 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and external devices.
The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.
The mobile terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.
Although not shown in fig. 1, the mobile terminal 100 may further include a bluetooth module or the like, which is not described in detail herein.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Example one
Based on the foregoing embodiments, this embodiment provides a photographing method, where an execution subject of the photographing method is a mobile terminal, and the mobile terminal is at least provided with an image acquisition module, and can acquire an image through the image acquisition module to obtain the image.
In practical applications, the image capturing module may be a Complementary Metal Oxide Semiconductor (CMOS) image sensing unit, a Charge-coupled device (CCD) image sensing unit, or other types of image sensing units. Here, the embodiments of the present invention are not particularly limited.
In practical applications, the mobile terminal may be an electronic device with a photographing function, such as a smart phone, a tablet computer, a digital camera, and the like, which has a front camera or a rear camera or a specific front camera and a specific rear camera at the same time, of course, the mobile terminal may also be other electronic devices, and the embodiment of the present invention is not particularly limited.
Further, the functions implemented by the photographing method can be implemented by calling the program code by a processor in the mobile terminal, and the program code can be stored in a computer storage medium. In practical application, the photographing method can be applied to various occasions needing photographing, such as night scene photographing, indoor self-photographing and the like.
Then, fig. 2 is a schematic flow chart of a photographing method according to a first embodiment of the present invention, and referring to fig. 2, the method includes:
s201: acquiring a photographing instruction;
specifically, the photographing instruction may be directly generated by a user completing a preset operation, for example, when the mobile terminal is in a screen-locked state, the user performs an operation of sliding left to enter a photographing mode, or a camera application icon clicked on a system desktop in the mobile terminal by the user. Of course, the interface may also be generated in other manners, for example, when the interface is generated by a third-party application call and is switched from another user graphical interface to the camera application, and here, the embodiment of the present invention is not particularly limited.
In practical application, when a user wants to take up the mobile terminal for taking a picture, if the user sees a lovely dog, the user can complete preset operation on the mobile terminal after taking up the mobile terminal, and then the mobile terminal can obtain a picture taking instruction.
In a specific implementation process, the preset operation may be a sliding operation, such as sliding a preset track, or a key operation, such as pressing a "volume + key" and a "power off key" at the same time, or a pressing operation, such as pressing the edge of a screen for a long time. Of course, other operations may be performed, such as double-clicking the screen, shaking the mobile terminal left and right, etc., or a combination of the above embodiments may be performed, such as the user long-pressing the screen at any position on either side edge of the screen of the mobile terminal with a finger and sliding a preset length in a direction opposite to the side edge (i.e., toward the other side of the screen opposite to the side edge), which may be determined by those skilled in the art in the course of implementation, and the embodiment of the present invention is not particularly limited.
Illustratively, referring to fig. 3A, a system user interface 31 is displayed on the terminal, and at a first time, the user presses the screen for a long time on the right edge 32 of the screen of the terminal and slides a preset trajectory to the other side of the screen. Next, referring to fig. 3B, at a second time after the first time, as the user continues to slide on the terminal screen, the terminal has already created and displayed a portion of the interface 33 of the camera application on the system user interface 31, and finally, after the terminal has completely displayed the interface 33 of the camera application, the mobile terminal can obtain the above-mentioned photographing instruction.
Further, the preset operation may be set by a user according to needs, or may be preset by a system of the mobile terminal, where the embodiment of the present invention is not specifically limited.
S202: executing a photographing instruction, and measuring the light intensity value of a scene to be photographed by the mobile terminal based on a preset exposure parameter;
specifically, after the mobile terminal obtains the photographing instruction, the mobile terminal can execute the photographing instruction, and perform photometry based on the preset exposure parameter, so as to measure the light intensity value of the scene to be photographed by the mobile terminal.
In general, exposure parameters for adjusting the exposure include: aperture, shutter time, and sensitivity. The aperture is used for controlling the amount of light entering the lens of the image acquisition module, such as 1/1.0(F1.0), 1/1.4(F1.4), 1/2.0(F2.0), 1/2.8(F2.8), 1/4.0(F4.0), and the like. The shutter time, i.e., exposure time, refers to the time interval from the shutter being opened to being closed, such as 1/1000s, 1/500s, 1/250s, 1/30s, 1/2s, 1/2s, 2s, 16s, and the like. Sensitivity (ISO) refers to the sensitivity of a photosensitive element in an image capture module in a mobile terminal to light, such as 100, 200, 400, 800, etc. In the case of the same sensitivity and shutter time, the larger the aperture, the more the exposure amount; the longer the shutter time, the more the exposure amount is, with the same aperture and sensitivity; the greater the sensitivity, the more the exposure amount is, with the same aperture and shutter time. Preferably, the exposure amount is adjusted by fixing the sensitivity, adjusting the shutter time, and adjusting the aperture.
In practical applications, the preset exposure parameters include: the preset aperture, the preset shutter time, and the preset sensitivity, for example, the preset exposure parameters may be set to { sensitivity: 100, aperture: f1.0, shutter time: 1/8s }.
Specifically, the light intensity value is used for representing the illumination condition of a scene to be shot by the mobile terminal. When the light intensity value is larger, the light quality corresponding to the current shooting scene is better, namely the light is brighter; when the light intensity value is smaller, it indicates that the light quality corresponding to the current shooting scene is poorer, i.e. the light is darker.
In a specific implementation process, the light intensity value of the current shooting scene can be obtained directly through a light metering mode of a photosensitive chip in an image acquisition module arranged on the mobile terminal; the light intensity value of the current shooting scene may also be obtained indirectly through an image acquired by an image acquisition module arranged on the mobile terminal, and of course, the light intensity value may also be obtained through other manners, where embodiments of the present invention are not specifically limited.
In practical applications, the photometry method can be divided into average photometry (also referred to as area photometry), center-weighted photometry (also referred to as center-weighted photometry), spot photometry (also referred to as midpoint photometry), and the like according to the difference of different areas, and calculation weights measured in the view field by the photo-sensing chip.
The following describes how to obtain the light intensity value of the current shooting scene by taking the example of obtaining the light intensity value through the image collected by the mobile terminal.
In a specific implementation process, the step S202 may include: acquiring an image by adopting a preset exposure parameter to obtain a frame of target image; and calculating the brightness value of the target image, and determining the brightness value of the target image as the light intensity value of the scene to be shot by the mobile terminal.
Specifically, the method of calculating the luminance value of the target image may include, but is not limited to, the following two ways.
In the first way, the brightness value of the target image can be obtained by calculating the average value of the brightness of all pixels on the target image, and at this time, the brightness value of the target image is the average brightness value of the target image.
A first step of calculating a luminance value of each pixel of a target image according to the following formula (1) based on an RGB value of each pixel;
Brti＝0.3×Ri+0.6×Gi+0.1×Biformula (1)
Wherein, BrtiRepresenting the intensity value of the ith pixel in the target image, (R)i,Gi,Bi) Representing the RGB values of the ith pixel on the target image.
In the second step, after the luminance of each pixel is obtained, the luminance value of the target image is calculated according to the following formula (2).
Where Brightness denotes the luminance value of the target image and N denotes the total number of pixels of the target image.
In the second way, the luminance value of the target image may be calculated by dividing the sub-image area.
Specifically, dividing a target image into at least two sub-image regions, and calculating a brightness value of each sub-image region; calculating the ratio of the pixel number of each sub-image area to the total pixel number of the target image to obtain the weight value of each sub-image area; and calculating the brightness value of the target image based on the brightness value and the weight value of each sub-image area.
The following is an example of dividing the target image into the first image area and the second image area, and how to calculate the luminance value of the target image by dividing the sub-image area will be described in detail.
The method comprises the steps of firstly, determining a first image area and a second image area from a target image;
specifically, the method for determining the first image region and the second image region from the target image may include, but is not limited to, the following two methods.
In the first method, the first image region and the second image region can be determined from the target image by setting a fixed shape and area size.
Illustratively, the target image may be divided into two rectangles, obtaining a first image area 411 and a second image area 412 as shown in fig. 4A; it is also possible to divide the target image into two image areas of different shapes, obtaining a first image area 421 and a second image area 422 as shown in fig. 4B.
In the second method, a target object, such as a human face, a human body, a tree, an animal and the like, is recognized from a target image by a target recognition method, an image area where the target object is located is determined as a first image area, and an image area where a background except the target object is located is determined as a second image area.
Illustratively, referring to fig. 4C, the image area where the target object 431 is located is a first image area 432, and the image area where the background is located is a second image area 433.
Of course, other modes can be adopted, and the embodiment of the present invention is not particularly limited herein.
A second step of calculating a luminance value of the first image area based on the RGB value of each pixel of the first image area and calculating a luminance value of the second image area based on the RGB value of each pixel of the second image area;
here, the luminance value of the first image region and the luminance value of the second image can still be calculated using formula (2).
Thirdly, counting the total pixel number of the first image area, and determining the ratio of the total pixel number of the first image area to the total pixel number of the first image as the weight value of the first image area, as shown in the following formula (3); similarly, counting the total pixel number of the second image area, and determining the ratio of the total pixel number of the second image area to the total pixel number of the first image area as the weight value of the second image area, as shown in the following formula (4);
where N denotes the total number of pixels of the first image, W1Weight value, N, representing the first image area1Representing the total number of pixels, W, of the first image area2Weight value, N, representing the second image area2Representing the total number of pixels of the second image area.
Fourth, the luminance value of the first image is calculated based on the luminance value and the weight value of the first image region and the luminance value and the weight value of the second image region, as shown in the following formula (5).
Brightness＝W1×Brightness1+W2×Brightness2Formula (5)
Wherein Brightness represents a luminance value of the first image, W1Indicating the weight value of the first image region, Brightness1A luminance value, W, representing the first image area2Indicating the weight value of the second image region, Brightness2Representing the luminance value of the second image area.
S203: determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy;
wherein the second exposure parameter is different from the first exposure parameter.
Here, the first exposure parameter may be used to improve a preview speed and a focusing speed at the time of image preview, and the second exposure parameter may be used to improve the quality of an image obtained by final photographing, such as brightness, sharpness.
In practical applications, the first exposure parameter and the second exposure parameter at least include: one or more of aperture, shutter time, and sensitivity. Illustratively, the first exposure parameter may be set as: sensitivity of 100, aperture of F2.0, shutter time of 1/4 s; the second exposure parameters may be set to: the sensitivity was 100, the aperture was F2.0, and the shutter time was 1/2 s. At this time, the exposure amount corresponding to the exposure with the first exposure parameter is smaller than the exposure amount corresponding to the exposure with the second exposure parameter.
In a specific implementation process, the step S203 may include: searching and obtaining an original exposure value corresponding to the light intensity value based on a pre-stored mapping relation between the light intensity value and the exposure value; and determining a first exposure parameter and a second exposure parameter according to a preset rule based on the original exposure value and a preset exposure compensation value.
Here, the Exposure Value (EV) represents a combination of all apertures and shutter times that can give the same Exposure amount (photoelectric), which reflects a combination of Exposure parameters. When the exposure value is small, the exposure amount is large.
For example, the mapping relationship between the light intensity value and the exposure value may be as shown in table 1 below.
| Light intensity value | Exposure value |
| 240 | 6 |
| 200 | 5 |
| 160 | 4 |
| 120 | 3 |
| 80 | 2 |
| 40 | 1 |
| 0 | 0 |
TABLE 1
For example, assuming that the light intensity value of the scene to be currently photographed by the mobile terminal is 240, the original exposure value corresponding to the light intensity value is 6 according to table 1.
In particular, exposure compensation is an exposure control method by which an exposure value can be adjusted. In practical applications, the exposure compensation value may have a value range of [ -2.0, +2.0], and when the exposure compensation value is set at intervals of 1/3, the preset exposure compensation value may be, for example, -2.0, -1.7, -1.3, -1.0, -0.7, -0.3 and +0.3, +0.7, +1.0, +1.3, +1.7 and + 2.0.
In a specific implementation process, since the exposure amounts required by different shooting modes are different, in order to more accurately determine the first exposure parameter and the second exposure parameter, different methods may be adopted to specifically set the corresponding first exposure parameter and the second exposure parameter according to the current shooting mode of the mobile terminal.
Thus, in another embodiment of the present invention, before the step of determining the first exposure parameter and the second exposure parameter according to the preset rule based on the original exposure value and the preset exposure compensation value, the step S203 may further include: comparing the light intensity value with a preset threshold value; and judging whether the mobile terminal is in a first shooting mode or a second shooting mode according to the comparison result, wherein the light of the second shooting mode is brighter than that of the first shooting mode.
Here, the light corresponding to the first photographing mode is dim, such as a night mode and a cloudy mode, and the light corresponding to the second photographing mode is bright, such as a sunlight mode and a sunny mode.
Specifically, in order to determine the shooting mode, the mobile terminal may compare a light intensity value of a scene to be shot by the mobile terminal with a preset threshold, and if the light intensity value is less than or equal to the preset threshold, it may be determined that the mobile terminal is in the first shooting mode, at this time, a larger exposure amount needs to be set; and if the light intensity value is greater than the preset threshold value, determining that the mobile terminal is in a second shooting mode, wherein a smaller exposure amount needs to be set.
In the specific implementation process, because the first shooting mode with dim light needs to set a larger exposure, and the second shooting mode with bright light needs to set a smaller exposure, so that the exposure required by different shooting modes is different, and different determination methods can be adopted for different shooting modes in order to determine more appropriate exposure parameters.
First, how to determine the first exposure parameter and the second exposure parameter when in the first photographing mode is described.
Specifically, when the mobile terminal is determined to be in a first shooting mode, adding a preset exposure compensation value to an original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; subtracting a preset exposure compensation value from the original exposure value to obtain a second exposure value; and searching the exposure parameter corresponding to the second exposure value in a preset exposure value and exposure parameter table to obtain the second exposure parameter.
Illustratively, taking the sensitivity as 100 as an example, the preset exposure value and exposure parameter table may be set as shown in table 2 below.
TABLE 2
Illustratively, assume that an original exposure value determined according to a light intensity value of a scene to be photographed by the mobile terminal is 2, and a preset exposure compensation value is 1. Then, the first exposure value is 3, at this time, the sensitivity is set to 100, and as can be seen from the lookup table 2, the first exposure parameter can be { shutter time: 1/8s, aperture: f1.0}, { shutter time: 1/4s, aperture: f1.4, etc. The second exposure value is 1, and the set sensitivity is 100, and the lookup table 2 shows that the second exposure parameter can be { shutter time: 1/2s, aperture: f1.0}, { shutter time: 1s, aperture: f1.4, etc.
Next, how to determine the first exposure parameter and the second exposure parameter when in the second photographing mode is described.
Specifically, when the mobile terminal is determined to be in the second shooting mode, adding a preset exposure compensation value to an original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; and searching an exposure parameter corresponding to the original exposure value in a preset exposure value and exposure parameter table to obtain a second exposure parameter.
Illustratively, assume that an original exposure value determined according to a light intensity value of a scene to be photographed by the mobile terminal is 2, and a preset exposure compensation value is 1. Then, the first exposure value is 3, at this time, the sensitivity is set to 100, and as can be seen from the lookup table 2, the first exposure parameter can be { shutter time: 1/8s, aperture: f1.0}, { shutter time: 1/4s, aperture: f1.4, etc. Since the original exposure value is 2, the set sensitivity is 100, and the lookup table 2 shows that the second exposure parameter can be { shutter time: 1/4s, aperture: f1.0}, { shutter time: 1/2s, aperture: f1.4, etc.
In practical applications, different sensitivities correspond to different shutter times and apertures at the same exposure value. Therefore, the number of the preset exposure value and the exposure parameter table is at least one.
S204: acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image;
specifically, after the mobile terminal determines the first exposure parameter, the mobile terminal may perform exposure based on the first exposure parameter, obtain a preview image, and display the preview image, so that the user may perform image preview.
To improve the user's preview experience, the process of previewing may include, but is not limited to, the following three scenarios.
In the first case, the preview image is processed by using an image processing algorithm, and then the processed preview image is displayed for the user to preview.
Then, in a specific implementation process, in order to improve the quality of the preview image, the above S204 may include: processing the preview image by adopting an image processing algorithm so as to improve the quality of the preview image; and displaying the processed preview image for a user to preview.
In practical applications, the above-mentioned image processing algorithms may be different according to the type of preview image quality to be improved. Illustratively, the image processing algorithm may be a denoising algorithm, such as a linear filtering method, a median filtering method, a wavelet transform, a color histogram equalization, etc., so as to reduce noise in the preview image; the image processing algorithm can also be an algorithm for enhancing brightness, such as gray scale stretching, logarithmic transformation, three-segment linear transformation and the like, so as to enhance the brightness and contrast of the preview image; of course, the image processing algorithm may be other algorithms, and the embodiment of the present invention is not particularly limited herein.
In the second case, the brightness values of different image areas in the target image are different, so that different exposure parameters can be used to expose the viewing ranges corresponding to different image areas.
Illustratively, exposure can be performed according to the first exposure parameter and the second exposure parameter at the same time to obtain a preview image of one frame, and the preview image is displayed for the user to preview.
Then, in a specific implementation process, in order to improve the quality of the preview image, the above S204 may include: and when the first brightness value of the first image area is smaller than the second brightness value of the second image area, exposing the view range corresponding to the first image area according to the first exposure parameter, and exposing the view range corresponding to the second image area according to the second exposure parameter to obtain and display a preview image.
And in the third situation, exposure is carried out according to the first exposure parameter and the second exposure parameter respectively to obtain two frames of images, and the two frames of images are fused into a frame preview image and displayed for a user to preview.
In a specific implementation process, in order to improve the quality of the preview image, the step S204 may include: acquiring a frame of first image based on the first exposure parameter; acquiring a frame of second image based on the second exposure parameter; and fusing the first image and the second image to obtain and display a preview image.
S205: and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
Specifically, after the user previews the preview image, the mobile terminal may take a picture based on the second exposure parameter to obtain a final image.
Thus, the photographing process is completed.
As can be seen from the above, in the photographing method provided in this embodiment, after the mobile terminal obtains the photographing instruction, the mobile terminal may execute the photographing instruction, measure the light intensity value of the scene to be photographed by the mobile terminal based on the preset exposure parameter, then after obtaining the light intensity value, the mobile terminal may determine, according to the light intensity value, a first exposure parameter corresponding to the light intensity value and a second exposure parameter different from the first exposure parameter, and finally, perform image acquisition according to the first exposure parameter to obtain a preview image, preview the preview image, and perform photographing based on the second exposure parameter after completing the preview of the preview image. Therefore, two different exposure parameters are set according to the light intensity value of the current shooting scene, and the accuracy of the exposure parameters can be improved; and then, the image preview and the final photographing process are completed through two different exposure parameters, so that the preview speed and the focusing speed can be considered while the image quality is ensured.
Example two
Based on the foregoing embodiments, the present embodiment provides a photographing method, which is applied to the following scenarios: the method for correspondingly determining the exposure parameters is adaptively selected according to the shooting mode of the mobile terminal, so as to determine more appropriate exposure parameters.
Then, fig. 5 is a schematic flow chart of a photographing method in the second embodiment of the present invention, and referring to fig. 5, the method includes:
s501: acquiring a photographing instruction;
s502: executing a photographing instruction, and measuring the light intensity value of a scene to be photographed by the mobile terminal based on a preset exposure parameter;
s503: searching and obtaining an original exposure value corresponding to the light intensity value based on a pre-stored mapping relation between the light intensity value and the exposure value;
s504: comparing the light intensity value with a preset threshold value;
s505: judging whether the mobile terminal is in a first shooting mode or a second shooting mode according to the comparison result;
the light ray of the second shooting mode is brighter than the light ray of the first shooting mode.
Executing S506 to S509 when it is determined that the mobile terminal is in the first photographing mode; when it is determined that the mobile terminal is in the second photographing mode, S510 to S512 are performed.
S506: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value;
s507: searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter;
s508: subtracting a preset exposure compensation value from the original exposure value to obtain a second exposure value;
s509: searching an exposure parameter corresponding to the second exposure value in a preset exposure value and exposure parameter table to obtain a second exposure parameter;
after the execution of S509, S513 to S514 are executed.
S510: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value;
s511: searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter;
s512: searching an exposure parameter corresponding to the original exposure value in a preset exposure value and exposure parameter table to obtain a second exposure parameter;
after the execution of S512, S513 to S514 are executed.
S513: acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image;
s514: and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
According to the photographing method provided by the embodiment, the method for correspondingly determining the exposure parameters is selected according to the photographing scene of the mobile terminal, so that the more appropriate exposure parameters can be determined, and the photographing experience of the user can be improved when photographing is performed according to the exposure parameters.
EXAMPLE III
Based on the same inventive concept, the embodiment provides a photographing apparatus applied to one or more mobile terminals.
Then, fig. 6 is a schematic structural diagram of a photographing apparatus in a third embodiment of the present invention, and referring to fig. 6, the photographing apparatus 60 includes: a memory 601, a processor 602, and a computer program 603 stored on the memory 601 and executable on the processor 602, the processor 602 implementing the following steps when executing the computer program 603: acquiring a photographing instruction; executing a photographing instruction, and measuring the light intensity value of a scene to be photographed by the mobile terminal based on a preset exposure parameter; determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy, wherein the second exposure parameter is different from the first exposure parameter; acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image; and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
Further, the processor may further implement the following steps when executing the program: searching and obtaining an original exposure value corresponding to the light intensity value based on a pre-stored mapping relation between the light intensity value and the exposure value; and determining a first exposure parameter and a second exposure parameter according to a preset rule based on the original exposure value and a preset exposure compensation value.
Further, before the step of determining the first exposure parameter and the second exposure parameter according to the preset rule based on the original exposure value and the preset exposure compensation value, the processor may further implement the following steps when executing the program: comparing the light intensity value with a preset threshold value; and judging whether the mobile terminal is in a first shooting mode or a second shooting mode according to the comparison result, wherein the light of the second shooting mode is brighter than that of the first shooting mode.
Further, the processor may further implement the following steps when executing the program: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; subtracting a preset exposure compensation value from the original exposure value to obtain a second exposure value; and searching the exposure parameter corresponding to the second exposure value in a preset exposure value and exposure parameter table to obtain the second exposure parameter.
Further, the processor may further implement the following steps when executing the program: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; and searching an exposure parameter corresponding to the original exposure value in a preset exposure value and exposure parameter table to obtain a second exposure parameter.
Further, the processor may further implement the following steps when executing the program: when the light intensity value is smaller than or equal to a preset threshold value, determining that the mobile terminal is in a first shooting mode; and when the light intensity value is greater than the preset threshold value, determining that the mobile terminal is in a second shooting mode.
Further, the processor may further implement the following steps when executing the program: acquiring an image by adopting a preset exposure parameter to obtain a frame of target image; and calculating the brightness value of the target image, and determining the brightness value as the light intensity value.
Further, the processor may further implement the following steps when executing the program: processing the preview image by adopting an image processing algorithm so as to improve the quality of the preview image; and displaying the processed preview image.
In practical applications, the Processor may be implemented by a Central Processing Unit (CPU), a GPU, a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Here, it should be noted that: the description of the above device embodiment is similar to the description of the above method, and has the same beneficial effects as the method embodiment, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiment of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiment of the method of the present invention to understand that, for the sake of brevity, detailed description is omitted here.
Example four
Based on the same inventive concept, the present embodiment provides a computer-readable storage medium, which can be applied to a mobile terminal in one or more embodiments, the computer-readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the following steps: acquiring a photographing instruction; executing a photographing instruction, and measuring the light intensity value of a scene to be photographed by the mobile terminal based on a preset exposure parameter; determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy, wherein the second exposure parameter is different from the first exposure parameter; acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image; and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
Further, the processor may further implement the following steps when executing the program: searching and obtaining an original exposure value corresponding to the light intensity value based on a pre-stored mapping relation between the light intensity value and the exposure value; and determining a first exposure parameter and a second exposure parameter according to a preset rule based on the original exposure value and a preset exposure compensation value.
Further, prior to the step of determining the first exposure parameter and the second exposure parameter according to the preset rule based on the original exposure value and the preset exposure compensation value, the one or more programs may be executed by the one or more processors to implement the steps of: comparing the light intensity value with a preset threshold value; and judging whether the mobile terminal is in a first shooting mode or a second shooting mode according to the comparison result, wherein the light of the second shooting mode is brighter than that of the first shooting mode.
Further, when it is determined that the mobile terminal is in the first photographing mode, the step of determining the first exposure parameter and the second exposure parameter based on the original exposure value and the preset exposure compensation value may be further executed by the one or more processors to implement the following steps: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; subtracting a preset exposure compensation value from the original exposure value to obtain a second exposure value; and searching the exposure parameter corresponding to the second exposure value in a preset exposure value and exposure parameter table to obtain the second exposure parameter.
Further, when it is determined that the mobile terminal is in the second photographing mode, the step of determining the first exposure parameter and the second exposure parameter based on the original exposure value and the preset exposure compensation value may be further executed by the one or more processors to implement the following steps: adding a preset exposure compensation value to the original exposure value to obtain a first exposure value; searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter; and searching an exposure parameter corresponding to the original exposure value in a preset exposure value and exposure parameter table to obtain a second exposure parameter.
Further, the step of determining whether the mobile terminal is in the first shooting mode or the second shooting mode according to the comparison result may be further executed by the one or more processors to implement the following steps: when the light intensity value is smaller than or equal to a preset threshold value, determining that the mobile terminal is in a first shooting mode; and when the light intensity value is greater than the preset threshold value, determining that the mobile terminal is in a second shooting mode.
Further, the step of measuring the light intensity value of the image capturing environment based on the preset exposure parameter may be further executed by the one or more processors to implement the following steps: acquiring an image by adopting a preset exposure parameter to obtain a frame of target image; and calculating the brightness value of the target image, and determining the brightness value as the light intensity value.
Further, the step of previewing an image based on the first exposure parameter may be further executed by the one or more processors to implement the steps of: processing the preview image by adopting an image processing algorithm so as to improve the quality of the preview image; and displaying the processed preview image.
The computer-readable storage medium may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic Random Access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); and may be various electronic devices such as mobile phones, computers, tablet devices, personal digital assistants, etc., including one or any combination of the above-mentioned memories.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A photographing method is applied to a mobile terminal, and comprises the following steps:
acquiring a photographing instruction;
executing the photographing instruction, and measuring the light intensity value of the scene to be photographed by the mobile terminal based on the preset exposure parameter;
determining a first exposure parameter and a second exposure parameter corresponding to the light intensity value according to a preset strategy, wherein the second exposure parameter is different from the first exposure parameter, the first exposure parameter is used for improving the preview speed and the focusing speed during image preview, and the second exposure parameter is used for improving the quality of an image obtained by final photographing;
acquiring an image based on the first exposure parameter to obtain a preview image, and previewing the preview image;
and after the preview image is previewed, photographing is carried out based on the second exposure parameter.
2. The method of claim 1, wherein determining the first exposure parameter and the second exposure parameter corresponding to the light intensity value according to a preset strategy comprises:
based on a mapping relation between a prestored light intensity value and an exposure value, searching and obtaining an original exposure value corresponding to the light intensity value;
and determining a first exposure parameter and a second exposure parameter according to a preset rule based on the original exposure value and a preset exposure compensation value.
3. The method of claim 2, wherein before said determining the first exposure parameter and the second exposure parameter according to a preset rule based on the original exposure value and a preset exposure compensation value, the method further comprises:
comparing the light intensity value with a preset threshold value;
and judging whether the mobile terminal is in a first shooting mode or a second shooting mode according to the comparison result, wherein the light of the second shooting mode is brighter than the light of the first shooting mode.
4. The method according to claim 3, wherein the determining the first exposure parameter and the second exposure parameter based on the original exposure value and a preset exposure compensation value when determining that the mobile terminal is in the first photographing mode comprises:
adding the original exposure value to the preset exposure compensation value to obtain a first exposure value;
searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter;
subtracting the preset exposure compensation value from the original exposure value to obtain a second exposure value;
and searching the exposure parameter corresponding to the second exposure value in the preset exposure value and exposure parameter table to obtain a second exposure parameter.
5. The method according to claim 3, wherein the determining the first exposure parameter and the second exposure parameter based on the original exposure value and a preset exposure compensation value when determining that the mobile terminal is in the second photographing mode comprises:
adding the original exposure value to the preset exposure compensation value to obtain a first exposure value;
searching an exposure parameter corresponding to the first exposure value in a preset exposure value and exposure parameter table to obtain a first exposure parameter;
and searching the exposure parameter corresponding to the original exposure value in the preset exposure value and exposure parameter table to obtain a second exposure parameter.
6. The method according to claim 3, wherein the determining whether the mobile terminal is in the first photographing mode or the second photographing mode according to the comparison result comprises:
when the light intensity value is smaller than or equal to the preset threshold value, determining that the mobile terminal is in the first shooting mode; and when the light intensity value is larger than the preset threshold value, determining that the mobile terminal is in the second shooting mode.
7. The method according to claim 1, wherein the measuring the light intensity value of the scene to be photographed by the mobile terminal based on the preset exposure parameter comprises:
acquiring an image by adopting a preset exposure parameter to obtain a frame of target image;
and calculating the brightness value of the target image, and determining the brightness value as the light intensity value.
8. The method of claim 1, wherein previewing the preview image comprises:
processing the preview image by adopting an image processing algorithm so as to improve the quality of the preview image;
and displaying the processed preview image.
9. A photographing apparatus characterized in that the photographing apparatus at least comprises: memory, processor and computer program stored on the memory and executable on the processor, the processor implementing the steps of the photographing method according to any of claims 1 to 8 when executing the program.
10. 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 photographing method according to any one of claims 1 to 8.
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| WO2019183819A1 (en) | 2018-03-27 | 2019-10-03 | 华为技术有限公司 | Photographic method, photographic apparatus, and mobile terminal |
| CN109194882B (en) | 2018-08-22 | 2020-07-31 | Oppo广东移动通信有限公司 | Image processing method, image processing device, electronic equipment and storage medium |
| CN109151333B (en) * | 2018-08-22 | 2020-07-03 | Oppo广东移动通信有限公司 | Exposure control method, exposure control device and electronic equipment |
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| CN108833802B (en) * | 2018-09-18 | 2020-07-31 | Oppo广东移动通信有限公司 | Exposure control method and device and electronic equipment |
| CN109218628B (en) * | 2018-09-20 | 2020-12-08 | Oppo广东移动通信有限公司 | Image processing method, image processing device, electronic equipment and storage medium |
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