CN110708475B - Exposure parameter determination method, electronic equipment and storage medium - Google Patents
Exposure parameter determination method, electronic equipment and storage medium Download PDFInfo
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- H04N23/70—Circuitry for compensating brightness variation in the scene
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Abstract
The embodiment of the invention discloses an exposure parameter determining method, electronic equipment and a storage medium, wherein the exposure parameter determining method is applied to the electronic equipment and comprises the following steps: receiving a first input of parameter value adjustment for a first exposure parameter during display of a first preview screen; responding to the first input, acquiring target brightness for displaying the first preview picture, wherein the target brightness is calculated according to a preset automatic exposure algorithm; determining a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness according to the parameter value of the first exposure parameter and the target brightness; one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time. By the embodiment of the invention, the parameter value of one exposure parameter in the light sensitivity and the exposure time which are manually adjusted by a user can be adaptively adjusted, and the adjustment efficiency is improved.
Description
Technical Field
The embodiment of the invention relates to the field of electronic equipment, in particular to an exposure parameter determining method, electronic equipment and a storage medium.
Background
Currently, when a user uses a camera to take a picture, the user can select full-manual exposure, that is, the exposure time and the sensitivity are both set manually by the user. For example, when the vehicle track is shot, the exposure time is manually adjusted to be several seconds to ten seconds; or when the picture shot by the user in the dark environment is not bright enough, the sensitivity needs to be manually adjusted, so that the picture brightness is improved.
For the case of full-manual exposure, the user needs to adjust the exposure time and the sensitivity in a coordinated manner each time, and the user takes a picture after adjusting the two parameters. If the quality of the shot picture is found to be low, the exposure time and the sensitivity are readjusted, and the process is repeated until a satisfactory picture is shot. However, the efficiency of the user manually adjusting the exposure time and sensitivity is very low.
Disclosure of Invention
The embodiment of the invention provides an exposure parameter determining method, which aims to solve the problem of low efficiency of manually adjusting exposure time and sensitivity by a user.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an exposure parameter determining method, which is applied to an electronic device, and the method includes:
receiving a first input of parameter value adjustment for a first exposure parameter during display of a first preview screen;
responding to the first input, and acquiring target brightness for displaying the first preview picture, wherein the target brightness is calculated according to a preset automatic exposure algorithm;
determining a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness according to the parameter value of the first exposure parameter and the target brightness;
wherein one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time.
In a second aspect, an embodiment of the present invention provides an electronic device, including:
the input receiving module is used for receiving first input aiming at parameter value adjustment of the first exposure parameter during the period of displaying the first preview picture;
the input response module is used for responding to the first input and acquiring target brightness for displaying the first preview picture, and the target brightness is calculated according to a preset automatic exposure algorithm;
a parameter value determining module, configured to determine, according to a parameter value of the first exposure parameter and the target brightness, a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness;
wherein one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the exposure parameter determination method.
In a fourth 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 exposure parameter determination method.
In the embodiment of the present invention, the parameter value of the other one of the sensitivity and the exposure time is automatically determined according to the parameter value of the one of the sensitivity and the exposure time manually adjusted by the user, without requiring the user to adjust the exposure time and the sensitivity each time. Therefore, when the user adjusts one exposure parameter, the electronic equipment can automatically determine the other exposure parameter, and the exposure time and the sensitivity adjustment efficiency are improved.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
FIG. 1 is a flow chart illustrating an exposure parameter determination method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a broken line of preview brightness as a function of a change in a parameter value of exposure time according to an embodiment of the present invention;
fig. 3 is a schematic view showing a broken line of preview luminance according to a variation of a parameter value of sensitivity according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the invention;
fig. 5 is a schematic diagram illustrating a hardware structure of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Generally, the brightness of a captured image is determined by the exposure Time (exposure Time) and the sensitivity (ISO means sensitivity, which is an abbreviation of International Standardization Organization, and it is the Organization that quantifies the sensitivity). Therefore, when photographing, the exposure time and the sensitivity need to be adjusted cooperatively to obtain an image with proper brightness. Sensitivity reflects the sensitivity of the photosensitive element of the camera to light. The higher the sensitivity, the higher the brightness, but the larger the noise. For the exposure time, light is projected onto the photosensitive element of the camera, the exposure time representing the time the shutter is open. The longer the exposure time, the more light comes in and the higher the brightness.
However, the manual adjustment by the user has a problem that the user has to perform a plurality of tests to take a plurality of pictures at different exposure times and sensitivities so as to find an exposure time and sensitivity suitable for the current environment.
Most users take a picture as a process: after adjusting the exposure time, an appropriate parameter value of the sensitivity is not clear. Therefore, firstly, the sensitivity is roughly adjusted to a value, and the picture is shot by clicking, and the picture is checked to find that the picture is too dark; improving ISO and taking a picture again, and finding that the picture is too bright; reduce ISO retake.
In view of the above situation, the present invention provides an exposure parameter determining method of an embodiment, which is applied to an electronic device.
Fig. 1 is a schematic flow chart illustrating an exposure parameter determining method according to an embodiment of the present invention. The exposure parameter determination method is applied to the electronic device, and as shown in fig. 1, the exposure parameter determination method includes:
step 102, while displaying the first preview screen, receives a first input of a parameter value adjustment for a first exposure parameter.
And 104, responding to the first input, and acquiring target brightness for displaying the first preview picture, wherein the target brightness is calculated according to a preset automatic exposure algorithm.
The brightness of the target is described below, for example, in a dark environment (e.g., under a desk), a camera of the electronic device is turned on, and then the electronic device is switched from the dark environment to a bright environment (e.g., from under the desk to on the desk). The first preview screen will brighten and then gradually return to a steady brightness. This is a luminance convergence process. After the brightness is stable, the displayed brightness is the target brightness of the first preview picture, and the target brightness is calculated by an automatic exposure algorithm.
106, determining a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness according to the parameter value of the first exposure parameter and the target brightness; one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time.
In the embodiment of the present invention, the parameter value of the other one of the sensitivity and the exposure time is automatically determined according to the parameter value of the one of the sensitivity and the exposure time manually adjusted by the user, without requiring the user to adjust the exposure time and the sensitivity each time. Therefore, when the user adjusts one exposure parameter, the electronic equipment can automatically determine the other exposure parameter, and the exposure time and the sensitivity adjustment efficiency are improved.
The parameter values of the first exposure parameter and the second exposure parameter can be applied to two scenes, namely a preview scene and a photographing scene.
Two scenarios are described below:
the parameter values of the first and second exposure parameters can be applied to the preview scene, that is, the parameter values of the second exposure parameter are used for shooting the second preview picture.
In order to maintain the normal display of the shot image, the value range of the parameter value of the exposure Time during the shooting of the preview image is: 1/12000 seconds < exposure Time < 0.1 second, the value range of the parameter value of the sensitivity ISO is: 100 ═ ISO ═ 3200. The above ranges of values of the exposure time and sensitivity are applicable to most common photosensitive elements (camera sensors). Here, the minimum values of the exposure time and the sensitivity are hardware limitations. The explanation for the maximum is as follows: the exposure time cannot be greater than 0.1 second, because the exposure time affects the preview frame rate, and too high results in more serious smear displayed during preview and poorer effect presented to the user; the reason why the sensitivity is not larger than 3200 is that increasing the sensitivity also amplifies noise, which is too large to cause serious interference with the preview effect. For example, when a preview screen is photographed, even if the user manually sets an exposure time of 32 seconds, the exposure time actually effective for the preview is 0.1 seconds at most. But upon receiving a photographing input by the user, photographing is performed according to an exposure time of 32 seconds in response to the photographing input.
Based on the above analysis, step 106 includes: determining a plurality of reference ranges of the first exposure parameter according to the maximum value and the minimum value of the second exposure parameter and the target brightness; and determining the parameter value of the second exposure parameter according to the range of the parameter value of the first exposure parameter in the multiple reference ranges.
In the embodiment of the invention, because the ranges of the first exposure parameters are different, the influence of the parameter values of the first exposure parameters on the parameter values of the second exposure parameters is different. Therefore, the parameter value of the second exposure parameter is determined according to the range of the parameter value of the first exposure parameter, and the parameter value of the second exposure parameter can be determined more accurately. In this case, the parameter value of the second exposure parameter determined by the electronic device and the parameter value of the first exposure parameter manually set by the user are both matched proper values, so that the quality of the shot picture is ensured.
Wherein, the parameter value of the second exposure parameter is determined in two cases, which is specifically as follows:
the first condition is as follows: the first exposure parameter is exposure time, and the second exposure parameter is sensitivity
1. Analysis of preview brightness variation when adjusting parameter values of exposure time
While the preview screen is displayed, the user manually adjusts the parameter value of the exposure time, and the change in the preview brightness is as shown in fig. 2. In fig. 2, Sensitivity _ max represents the maximum preview brightness when both the exposure time and the Sensitivity take the maximum values; the Sensitivity _ normal represents the target brightness, and this value is calculated by an Auto Exposure (AE) module according to a predetermined AE algorithm; the Exptime _ min represents the minimum exposure time.
The sensitivity and the exposure time can be converted in terms of luminance by the same amount, and if the sensitivity is increased, the exposure time is reduced to maintain the target luminance. In this case, the expotime _ min _ maxoiso (i.e., the first exposure time) represents a minimum exposure time for keeping the brightness of the target constant at the maximum sensitivity; an expotime _ max _ minISO (second exposure time) represents a maximum exposure time for keeping the target luminance constant at the minimum sensitivity; the expotime _ max _ maxoiso represents the exposure time in the case of the maximum preview brightness Sensitivity _ max; the Exptime _ max represents the maximum exposure time.
As can be seen from fig. 2:
in the range from the Exptime _ min to the Exptime _ min _ maxISO (namely, the first exposure time), the preview brightness gradually becomes brighter and cannot meet the target brightness, the preview brightness is smaller than the target brightness, and the sensitivity always takes the maximum value.
In the range of the expotime _ min _ maxsiso (i.e., the first exposure time) to the expotime _ max _ miniiso (the second exposure time), the preview brightness is not changed, the preview brightness can satisfy the target brightness, the exposure time is increased, the sensitivity is passively adjusted, and the sensitivity is gradually decreased.
In the range from the Exptime _ max _ minISO (second exposure time) to the Exptime _ max _ maxsiso, the preview luminance gradually becomes brighter, the preview luminance cannot satisfy the target luminance, the preview luminance is larger than the target luminance, and the preview luminance does not change any more when the exposure time increases to the maximum, and the excess is converted into sensitivity.
The point a is the maximum value of the exposure time, and when the exposure time is increased continuously, the sensitivity needs to be converted into the sensitivity, that is, the sensitivity gradually increases from the minimum value.
In the range of the exposition _ max _ maxsiso to 32s, the preview brightness is not changed, the exposure time and the sensitivity which are actually effective reach the maximum value when the preview brightness is converted to the maximum sensitivity, and at this time, the preview brightness cannot be increased even if the exposure time is continuously increased.
2. Based on the above analysis, the user manually adjusts the parameter value of the exposure time, and the calculation method of the parameter value of the sensitivity can be summarized as follows:
(1) obtaining and calculating related parameters, for example, calculating and obtaining related parameters are as follows:
minimum exposure time: min _ exposureTime 8.3333e-5(s)
Maximum exposure time: max _ exposureTime ═ 0.1(s)
Minimum sensitivity: min _ ISO is 100
Maximum sensitivity: max _ ISO 3200
Minimum exposure time Exptime _ min _ maxoiso (i.e., first exposure time) to keep the target brightness unchanged at maximum sensitivity:
maximum exposure time Exptime _ max _ minISO (i.e., second exposure time) to keep the target luminance unchanged at the minimum sensitivity:
the reference sensitivity ISO _ maxexptime that satisfies the target luminance in the case of the maximum exposure time:
of the three equations, sensitivity _ normal is a known constant representing the target brightness, and this value is output by the Auto Exposure (AE) module. The AE belongs to a module for calculating automatic exposure in a camera, and can accurately calculate exposure time and sensitivity according to the current environment.
(2) Determining a parameter value of a second exposure parameter (i.e. sensitivity)
a. When the parameter value of the exposure time is smaller than the expotime _ min _ maxoiso (i.e., the first exposure time), the parameter value of the sensitivity is maximized because the parameter value of the exposure time is too small, which may not satisfy the normal exposure. That is, the parameter value ISO of the sensitivity satisfies:
ISO＝max_ISO (4)
b. in the case where the parameter value of the exposure time is larger than the expotime _ max _ minISO (i.e., the second exposure time), too large a parameter value of the exposure time causes the parameter value of the sensitivity to take the minimum value and also fails to satisfy the normal exposure. Therefore, the parameter value of the sensitivity is determined according to the minimum sensitivity.
The determining of the parameter value of the sensitivity according to the minimum sensitivity specifically includes:
in the case where the parameter value of the exposure time is smaller than the maximum exposure time, the parameter value of the sensitivity is determined to be the minimum sensitivity.
In the case where the parameter value of the exposure time is greater than or equal to the maximum exposure time, the parameter value of the sensitivity is determined as a product of the minimum sensitivity and the parameter value of the exposure time.
That is, the parameter value of the sensitivity satisfies the following formula:
where, exttime denotes a parameter value of exposure time, and ISO denotes a parameter value of sensitivity.
In the case of b, when the exposure time is less than the maximum exposure time, the exposure time does not need to be converted into sensitivity, and the parameter value of the sensitivity directly takes the minimum sensitivity, so that the requirement of previewing the brightness can be met. When the parameter value of the exposure time is greater than or equal to the maximum exposure time, the exposure time needs to be converted into sensitivity to improve preview brightness, so that the captured picture is prevented from being too dark.
c. In the case where the parameter value of the exposure time is greater than or equal to Exptime _ min _ maxoiso (i.e., the first exposure time) and less than or equal to Exptime _ max _ miniiso (i.e., the second exposure time), the parameter value of the exposure time is moderate, and the parameter value of the sensitivity is determined according to the target luminance and the maximum exposure time.
The determining of the parameter value of the sensitivity according to the target brightness and the maximum exposure time specifically includes:
calculating a reference sensitivity (ISO _ maxexptim) satisfying the target luminance in the case of the maximum exposure time and a ratio obtained by dividing the parameter value of the exposure time by the maximum exposure time, in the case where the parameter value of the exposure time is greater than the maximum exposure time; taking the product of the reference sensitivity (ISO _ maxexptim) and the ratio as a parameter value of the sensitivity;
in the case where the parameter value of the exposure time is less than or equal to the maximum exposure time, the parameter value determining the sensitivity is a value obtained by dividing the target luminance by the parameter value of the exposure time.
That is, the parameter value ISO of the sensitivity satisfies the following formula:
under the condition of c, when the parameter value of the exposure time is larger than the maximum exposure time, the parameter value of the exposure time is larger, and the parameter value of the exposure time needs to be converted into the sensitivity, namely, the ISO _ maxexptim is increased to determine the parameter value of the sensitivity, so that the preview brightness is improved, and the shot picture is prevented from being too dark. Under the condition that the parameter value of the exposure time is less than or equal to the maximum exposure time, the parameter value of the exposure time is in a proper range, the parameter value of the exposure time does not need to be converted into the light sensitivity, the parameter value of the light sensitivity is directly calculated, and the requirement of previewing the brightness can be met.
In the embodiment of the invention, after the user manually adjusts the parameter value of the exposure time, the electronic device can adaptively determine the parameter value of the sensitivity, namely, semi-automatic exposure. Compared with the prior art: after adjusting the parameter value of the exposure time, the user manually adjusts the parameter value of the light sensitivity to different values for multiple times, photographs once every time, and compares the effect of photographing for multiple times to obtain a better parameter value of the light sensitivity.
Case two: the first exposure parameter is light sensitivity, and the second exposure parameter is exposure time
1. Analysis of preview luminance change for adjusting parameter value of sensitivity
While the preview screen is displayed, the user manually adjusts the sensitivity parameter value, and the preview brightness changes as shown in fig. 3. In fig. 3, Sensitivity _ max represents the maximum preview brightness when both the exposure time and the Sensitivity take the maximum values; sensivity _ normal represents the target brightness, which is calculated by AE; ISO _ min: a minimum sensitivity; ISO _ min _ maxexptim (i.e., the first sensitivity) represents a minimum sensitivity at which the target luminance is kept unchanged with a maximum exposure time; ISO _ max _ minExptime (i.e., the second sensitivity) represents a maximum sensitivity at which the target luminance is kept unchanged with a minimum exposure time; ISO _ max represents the maximum sensitivity.
As can be seen from fig. 3:
in the range from ISO _ min to ISO _ min _ maxExptime (namely the first sensitivity), the preview brightness gradually becomes brighter, the preview brightness cannot meet the normal brightness, namely the preview brightness is smaller than the normal brightness, and the exposure time is always maximized.
In the range from ISO _ min _ maxexptim (i.e., the first sensitivity) to ISO _ max _ minexptim (i.e., the second sensitivity), the preview luminance is constant and can satisfy the normal luminance, and when the sensitivity is increased, the exposure time is passively adjusted and gradually decreased.
In the range of ISO _ max _ minExptime (i.e., the second sensitivity) to ISO _ max, the preview luminance gradually becomes brighter and fails to satisfy the normal luminance, the current preview luminance is larger than the normal luminance, the sensitivity gradually increases, but the exposure time does not change.
2. Based on the above analysis, the user manually adjusts the parameter value of the sensitivity, and the calculation method of the parameter value of the exposure time can be summarized as follows:
(1) obtaining and calculating related parameters, for example, calculating and obtaining related parameters are as follows:
minimum exposure time: min _ exposureTime 8.3333e-5(s)；
Maximum exposure time: max _ exposureTime ═ 0.1(s);
minimum sensitivity: min _ ISO is 100;
maximum sensitivity: max _ ISO 3200;
minimum sensitivity ISO _ min _ maxexptim (i.e., first sensitivity) that keeps the target luminance unchanged at the maximum exposure time:
a maximum sensitivity ISO _ max _ minExptime (i.e., a second sensitivity) that keeps the target luminance unchanged with a minimum exposure time:
(2) determining a parameter value of a second exposure parameter (i.e. exposure time)
a. In the case where the parameter value of the sensitivity is smaller than ISO _ min _ maxexptim (i.e., the first sensitivity), the parameter value of the exposure time is determined to be the maximum exposure time.
In this case, since the value of the sensitivity parameter is too small, the maximum value of the exposure time parameter does not satisfy the normal exposure, and the maximum value of the exposure time parameter is directly obtained. I.e. the parameter value of the exposure time, xptime, satisfies:
exptime＝max_exposureTime (9)
b. in the case where the parameter value of the sensitivity is larger than ISO _ max _ minExptime (i.e., the second sensitivity), the parameter value of the exposure time is determined to be the minimum exposure time.
In this case, the minimum value of the exposure time parameter value cannot satisfy the normal exposure because the sensitivity parameter value is too large, and the minimum value of the exposure time parameter value is directly used. I.e. the parameter value of the exposure time, xptime, satisfies:
exptime＝min_exposureTime (10)
c. in the case where the parameter value of the sensitivity is greater than or equal to ISO _ min _ maxexptim (i.e., the first sensitivity) and less than or equal to ISO _ max _ minexptim (i.e., the second sensitivity), the parameter value that describes the sensitivity is moderate, and the parameter value that determines the exposure time is a value obtained by dividing the target luminance by the parameter value of the sensitivity. I.e. the parameter value of the exposure time, xptime, satisfies:
where ISO represents a parameter value of sensitivity.
In the embodiment of the present invention, after the user manually adjusts the parameter value of the sensitivity, the electronic device may adaptively determine the parameter value of the exposure time, that is, the semi-automatic exposure. Compared with the prior art: after the user adjusts the parameter value of the light sensitivity, the parameter value of the exposure time needs to be adjusted to different values for multiple times, the user takes a picture once by adjusting each time, and a better light sensitivity parameter value is obtained by comparing the effect of taking pictures for multiple times.
And secondly, the parameter values of the second exposure parameter can be applied to a photographing scene, namely the parameter values of the second exposure parameter are used for taking a picture.
Step 106 comprises: and dividing the target brightness by the parameter value of the first exposure parameter to obtain a value as the parameter value of the second exposure parameter.
In the embodiment of the present invention, the parameter values of the exposure time and the sensitivity at the time of photographing are not limited by the ranges. For example, during the period of shooting the preview picture, the value range of the parameter value of the exposure Time is: 1/12000 seconds < exposure Time < 0.1 seconds, even if the user manually sets an exposure Time of 32 seconds, the exposure Time effective during the display of the preview screen is at most 0.1 seconds, but upon receiving a user's photographing input, photographing is performed according to the exposure Time of 32 seconds.
Therefore, the value obtained by dividing the target brightness when the preview screen is displayed by the parameter value of the first exposure parameter is used as the parameter value of the second exposure parameter, and it is not necessary to consider the range of the parameter value of the first exposure parameter. The method and the device realize that the user manually adjusts the parameter value of the exposure time, the electronic equipment adaptively adjusts the parameter value of the sensitivity, or the user manually adjusts the parameter value of the sensitivity, and the electronic equipment adaptively adjusts the parameter value of the exposure time. The user is not required to continuously and manually adjust the exposure time and the light sensitivity parameter value, so that the time of the user is saved, and the photographing experience of the user is improved.
Fig. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 4, the electronic apparatus 200 includes:
an input receiving module 202, configured to receive a first input for parameter value adjustment of a first exposure parameter during displaying of a first preview screen;
an input response module 204, configured to respond to a first input, obtain target brightness for displaying the first preview image, where the target brightness is calculated according to a predetermined automatic exposure algorithm;
a parameter value determining module 206, configured to determine, according to a parameter value of a first exposure parameter and the target brightness, a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness; one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time.
In the embodiment of the present invention, the parameter value of the other one of the sensitivity and the exposure time is automatically determined according to the parameter value of the one of the sensitivity and the exposure time manually adjusted by the user, without requiring the user to adjust the exposure time and the sensitivity each time. Therefore, when the user adjusts one exposure parameter, the electronic equipment can automatically determine the other exposure parameter, and the exposure time and the sensitivity adjustment efficiency are improved.
Optionally, the parameter value determining module 206 includes:
the parameter range determining module is used for determining a plurality of reference ranges of the first exposure parameter according to the maximum value and the minimum value of the second exposure parameter and the target brightness when the preview picture is displayed;
and the first parameter value determining module is used for determining the parameter value of the second exposure parameter according to the range of the parameter value of the first exposure parameter in the multiple reference ranges.
Optionally, in a case where the first exposure parameter is exposure time and the second exposure parameter is sensitivity, the plurality of reference ranges includes: less than the first exposure time, greater than the second exposure time, greater than or equal to the first exposure time and less than or equal to the second exposure time; wherein the first exposure time represents a minimum exposure time for keeping the brightness of the target constant at a maximum sensitivity, and the second exposure time represents a maximum exposure time for keeping the brightness of the target constant at a minimum sensitivity.
The first parameter value determination module includes:
the first sensitivity parameter value determining module is used for determining that the parameter value of the sensitivity is the maximum sensitivity under the condition that the parameter value of the exposure time is smaller than the first exposure time;
a second sensitivity parameter value determining module, configured to determine a parameter value of sensitivity according to the minimum sensitivity when the parameter value of the exposure time is greater than the second exposure time;
and the third sensitivity parameter value determining module is used for determining the parameter value of the sensitivity according to the target brightness and the maximum exposure time when the preview picture is displayed under the condition that the parameter value of the exposure time is greater than or equal to the first exposure time and is less than or equal to the second exposure time.
Optionally, the second sensitivity parameter value determining module includes:
a first sensitivity determining submodule for determining a parameter value of sensitivity as a minimum sensitivity when the parameter value of the exposure time is smaller than the maximum exposure time;
and a second sensitivity determination submodule for determining the parameter value of the sensitivity as a product of the minimum sensitivity and the parameter value of the exposure time in a case where the parameter value of the exposure time is greater than or equal to the maximum exposure time.
Optionally, the third sensitivity parameter value determining module includes:
a third sensitivity determining submodule for calculating a reference sensitivity (i.e., ISO _ maxexptime) satisfying a target luminance at the time of displaying the preview screen in the case of the maximum exposure time and a ratio obtained by dividing the parameter value of the exposure time by the maximum exposure time, in the case of the parameter value of the exposure time being greater than the maximum exposure time; taking the product of the reference sensitivity and the ratio as the parameter value of the sensitivity;
and the fourth sensitivity determining submodule is used for determining the parameter value of the sensitivity as a value obtained by dividing the target brightness in the display of the preview picture by the parameter value of the exposure time under the condition that the parameter value of the exposure time is less than or equal to the maximum exposure time.
Optionally, in a case where the first exposure parameter is sensitivity and the second exposure parameter is exposure time, the plurality of reference ranges includes: less than the first sensitivity, greater than the second sensitivity, greater than or equal to the first sensitivity and less than or equal to the second sensitivity; wherein the first sensitivity represents a minimum sensitivity at which the target luminance is kept constant in a case of a maximum exposure time, and the second sensitivity represents a maximum sensitivity at which the target luminance is kept constant in a case of a minimum exposure time.
The first parameter value determination module includes:
the first exposure time parameter value determining module is used for determining the parameter value of the exposure time as the maximum exposure time under the condition that the parameter value of the sensitivity is smaller than the first sensitivity;
a second exposure time parameter value determining module, configured to determine that a parameter value of the exposure time is a minimum exposure time when the parameter value of the sensitivity is greater than the second sensitivity;
and the third exposure time parameter value determining module is used for determining the parameter value of the exposure time as a value obtained by dividing the target brightness in the display of the preview picture by the parameter value of the sensitivity under the condition that the parameter value of the sensitivity is greater than or equal to the first sensitivity and less than or equal to the second sensitivity.
Optionally, in the case that the second exposure parameter is used for taking a picture, the parameter value determining module 206 includes:
and the second parameter value determining module is used for dividing the target brightness by the parameter value of the first exposure parameter to obtain a value serving as the parameter value of the second exposure parameter.
Fig. 5 shows a schematic diagram of a hardware structure of an electronic device 300 according to an embodiment of the present invention, where the electronic device 300 includes, but is not limited to: radio frequency unit 301, network module 302, audio output unit 303, input unit 304, sensor 305, display unit 306, user input unit 307, interface unit 308, memory 309, processor 310, and power supply 311. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 5 does not constitute a limitation of the electronic device, and that the electronic device may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the electronic device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
A user input unit 307 configured to receive a first input of parameter value adjustment for the first exposure parameter while the first preview screen is displayed;
a processor 310, configured to obtain a target brightness for displaying the first preview screen in response to the first input, where the target brightness is calculated according to a predetermined automatic exposure algorithm; determining a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness according to the parameter value of the first exposure parameter and the target brightness; wherein one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time.
In the embodiment of the present invention, the parameter value of the other one of the sensitivity and the exposure time is automatically determined according to the parameter value of the one of the sensitivity and the exposure time manually adjusted by the user, without requiring the user to adjust the exposure time and the sensitivity each time. Therefore, when the user adjusts one exposure parameter, the electronic equipment can automatically determine the other exposure parameter, and the exposure time and the sensitivity adjustment efficiency are improved.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 301 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 310; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 301 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 301 can also communicate with a network and other devices through a wireless communication system.
The electronic device provides wireless broadband internet access to the user via the network module 302, such as assisting the user in sending and receiving e-mails, browsing web pages, and accessing streaming media.
The audio output unit 303 may convert audio data received by the radio frequency unit 301 or the network module 302 or stored in the memory 309 into an audio signal and output as sound. Also, the audio output unit 303 may also provide audio output related to a specific function performed by the electronic apparatus 300 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 303 includes a speaker, a buzzer, a receiver, and the like.
The input unit 304 is used to receive audio or video signals. The input Unit 304 may include a Graphics Processing Unit (GPU) 3041 and a microphone 3042, and the Graphics processor 3041 processes image data of a still picture or video obtained by an image capturing apparatus (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 306. The image frames processed by the graphic processor 3041 may be stored in the memory 309 (or other storage medium) or transmitted via the radio frequency unit 301 or the network module 302. The microphone 3042 may receive sounds and may be capable of processing such sounds into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 301 in case of the phone call mode.
The electronic device 300 also includes at least one sensor 305, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 3061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 3061 and/or the backlight when the electronic device 300 is moved to the ear. As one type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of an electronic device (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer, tapping); the sensors 305 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.
The display unit 306 is used to display information input by the user or information provided to the user. The Display unit 306 may include a Display panel 3061, and the Display panel 3061 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 307 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic device. Specifically, the user input unit 307 includes a touch panel 3071 and other input devices 3072. The touch panel 3071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 3071 (e.g., operations by a user on or near the touch panel 3071 using a finger, a stylus, or any suitable object or attachment). The touch panel 3071 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 310, and receives and executes commands sent by the processor 310. In addition, the touch panel 3071 may be implemented using various types, such as resistive, capacitive, infrared, and surface acoustic wave. The user input unit 307 may include other input devices 3072 in addition to the touch panel 3071. Specifically, the other input devices 3072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described herein.
Further, the touch panel 3071 may be overlaid on the display panel 3061, and when the touch panel 3071 detects a touch operation on or near the touch panel, the touch operation is transmitted to the processor 310 to determine the type of the touch event, and then the processor 310 provides a corresponding visual output on the display panel 3061 according to the type of the touch event. Although in fig. 5, the touch panel 3071 and the display panel 3061 are implemented as two separate components to implement the input and output functions of the electronic device, in some embodiments, the touch panel 3071 and the display panel 3061 may be integrated to implement the input and output functions of the electronic device, which is not limited herein.
The interface unit 308 is an interface for connecting an external device to the electronic apparatus 300. 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 308 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the electronic apparatus 300 or may be used to transmit data between the electronic apparatus 300 and the external device.
The memory 309 may be used to store software programs as well as various data. The memory 309 may mainly include a program storage area and a data storage area, wherein the program storage 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 309 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 310 is a control center of the electronic device, connects various parts of the whole electronic device by using various interfaces and lines, performs various functions of the electronic device and processes data by operating or executing software programs and/or modules stored in the memory 309 and calling data stored in the memory 309, thereby performing overall monitoring of the electronic device. Processor 310 may include one or more processing units; preferably, the processor 310 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 310.
The electronic device 300 may further include a power supply 311 (such as a battery) for supplying power to various components, and preferably, the power supply 311 may be logically connected to the processor 310 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.
In addition, the electronic device 300 includes some functional modules that are not shown, and are not described in detail herein.
An embodiment of the present invention further provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the above-mentioned exposure parameter determining method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
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 computer program implements each process of the above-mentioned exposure parameter determining method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
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.
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 (8)
1. An exposure parameter determination method applied to an electronic device is characterized by comprising the following steps:
receiving a first input of a user for parameter value adjustment of a first exposure parameter during display of a first preview screen;
responding to the first input, and acquiring target brightness for displaying the first preview picture, wherein the target brightness is calculated according to a preset automatic exposure algorithm;
determining a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness according to the parameter value of the first exposure parameter and the target brightness;
wherein one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time;
the determining, according to the parameter value of the first exposure parameter and the target brightness, the parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness includes:
under the condition that the parameter value of the second exposure parameter is used for shooting a second preview picture, determining a plurality of reference ranges of the first exposure parameter according to the maximum value and the minimum value of the second exposure parameter and the target brightness; determining the parameter value of the second exposure parameter according to the range of the parameter value of the first exposure parameter in the multiple reference ranges;
and under the condition that the second exposure parameter is used for taking a picture, taking a value obtained by dividing the target brightness by the parameter value of the first exposure parameter as the parameter value of the second exposure parameter.
2. The method according to claim 1, wherein in the case where the first exposure parameter is exposure time and the second exposure parameter is sensitivity,
the plurality of reference ranges includes: less than the first exposure time, greater than the second exposure time, greater than or equal to the first exposure time and less than or equal to the second exposure time; wherein the first exposure time represents a minimum exposure time for which the target brightness is kept constant at a maximum sensitivity, and the second exposure time represents a maximum exposure time for which the target brightness is kept constant at a minimum sensitivity;
the determining the parameter value of the second exposure parameter according to the range of the parameter value of the first exposure parameter in the multiple reference ranges includes:
determining the parameter value of the sensitivity as the maximum sensitivity under the condition that the parameter value of the exposure time is less than the first exposure time;
determining a parameter value of sensitivity according to the minimum sensitivity when the parameter value of the exposure time is greater than a second exposure time;
and determining the parameter value of the sensitivity according to the target brightness and the maximum exposure time under the condition that the parameter value of the exposure time is greater than or equal to the first exposure time and is less than or equal to the second exposure time.
3. The method according to claim 2, wherein determining the parameter value of the sensitivity according to the minimum sensitivity comprises:
determining the parameter value of the sensitivity as the minimum sensitivity under the condition that the parameter value of the exposure time is less than the maximum exposure time;
determining the parameter value of the sensitivity as a product of the minimum sensitivity and the parameter value of the exposure time in a case where the parameter value of the exposure time is greater than or equal to the maximum exposure time.
4. The method of claim 2, wherein determining the value of the sensitivity parameter based on the target brightness and the maximum exposure time comprises:
calculating a reference sensitivity which satisfies the target brightness under the condition of the maximum exposure time when the parameter value of the exposure time is greater than the maximum exposure time, and a ratio obtained by dividing the parameter value of the exposure time by the maximum exposure time; taking the product of the reference sensitivity and the ratio as a parameter value of sensitivity;
and under the condition that the parameter value of the exposure time is less than or equal to the maximum exposure time, determining the parameter value of the sensitivity as a value obtained by dividing the target brightness by the parameter value of the exposure time.
5. The method according to claim 1, wherein in the case where the first exposure parameter is sensitivity and the second exposure parameter is exposure time,
the plurality of reference ranges includes: less than the first sensitivity, greater than the second sensitivity, greater than or equal to the first sensitivity and less than or equal to the second sensitivity; wherein the first sensitivity represents a minimum sensitivity at which the target luminance is kept constant in a case of a maximum exposure time, and the second sensitivity represents a maximum sensitivity at which the target luminance is kept constant in a case of a minimum exposure time;
the determining the parameter value of the second exposure parameter according to the range of the parameter value of the first exposure parameter in the multiple reference ranges includes:
determining the parameter value of the exposure time as the maximum exposure time under the condition that the parameter value of the sensitivity is smaller than the first sensitivity;
determining the parameter value of the exposure time as the minimum exposure time under the condition that the parameter value of the sensitivity is greater than the second sensitivity;
in the case where the parameter value of the sensitivity is greater than or equal to the first sensitivity and less than or equal to the second sensitivity, the parameter value of the exposure time is determined as a value obtained by dividing the target luminance by the parameter value of the sensitivity.
6. An electronic device, comprising:
the input receiving module is used for receiving first input of parameter value adjustment of a first exposure parameter by a user during the period of displaying the first preview picture;
the input response module is used for responding to the first input and acquiring target brightness for displaying the first preview picture, and the target brightness is calculated according to a preset automatic exposure algorithm;
a parameter value determining module, configured to determine, according to a parameter value of the first exposure parameter and the target brightness, a parameter value of a second exposure parameter associated with the parameter value of the first exposure parameter and the target brightness;
wherein one of the first exposure parameter and the second exposure parameter is sensitivity, and the other is exposure time;
the parameter value determination module comprises:
a parameter range determining module, configured to determine, when a parameter value of the second exposure parameter is used to capture a second preview picture, a plurality of reference ranges of the first exposure parameter according to a maximum value and a minimum value of the second exposure parameter and the target brightness;
a first parameter value determining module, configured to determine a parameter value of the second exposure parameter according to a range in which a parameter value of the first exposure parameter in the multiple reference ranges is located;
and the second parameter value determining module is used for dividing the target brightness by the parameter value of the first exposure parameter to obtain a value serving as the parameter value of the second exposure parameter under the condition that the second exposure parameter is used for taking a picture.
7. An electronic device, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the exposure parameter determination method according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the exposure parameter determination method according to any one of claims 1 to 5.
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| CN112468738A (en) * | 2020-11-25 | 2021-03-09 | 上海摩象网络科技有限公司 | Image display method, image display device, electronic device, and storage medium |
| CN115297269B (en) * | 2022-09-27 | 2023-04-07 | 荣耀终端有限公司 | Exposure parameter determination method and electronic equipment |
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