CN115665557B - Image processing method and device and image acquisition equipment - Google Patents
Image processing method and device and image acquisition equipment Download PDFInfo
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Abstract
The embodiment of the application provides an image processing method, an image processing device and image acquisition equipment, and relates to the technical field of image processing. The method comprises the following steps: determining current ambient brightness and current sensor gain when the image acquisition equipment captures an image to be shot; determining a current sensitivity based on the current sensor gain; if the corresponding relation between the specified gain item and the current sensitivity does not have the target gain value corresponding to the current sensitivity in the corresponding relation between the specified gain item and the gain value under the current ambient brightness, selecting a first gain value corresponding to the first sensitivity and a second gain value corresponding to the second sensitivity in the corresponding relation; calculating a target gain value by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity; and shooting the image to be shot according to the target gain value to obtain a target image. Compared with the prior art, the scheme provided by the embodiment of the application can improve the image quality, so that the display effect of the picture of the shot image is close to a real scene.
Description
Technical Field
The present disclosure relates to the field of image processing technologies, and in particular, to an image processing method and apparatus, and an image acquisition device.
Background
With the continuous development of technology, users can take images or videos using an image capturing device. For example, image capturing is performed under different illumination environments. However, when the ambient brightness is low, the whole photographed color image may show a color cast condition of the picture, resulting in that the whole picture shows an effect deviating from a real scene.
In the related art, a plurality of brightness levels may be divided in advance, and an image parameter configuration file corresponding to a different sensing degree is set under each brightness level. In this way, after the image acquisition device acquires the brightness information of the current environment by using the information of the AE (Auto Exposure) module, the brightness level to which the brightness information of the current environment belongs and the current sensitivity corresponding to the brightness information of the current environment can be determined, and then, the image parameter configuration file corresponding to the current sensitivity under the brightness level is called to adjust the image parameter configuration file so as to improve the image quality of the shot image, so that the shot image can be close to the real scene.
However, in some cases, if the obtained image parameter configuration file corresponding to the current sensitivity does not exist under the current environment brightness, the parameter adjustment cannot be performed on the image acquisition device, so that the situation that the shot image still has a color cast of the picture exists, and the presentation effect of the whole picture deviates from the real scene.
Disclosure of Invention
An object of the embodiments of the present application is to provide an image processing method, an image processing device, and an image acquisition device, so as to improve image quality, and enable a presentation effect of a picture of a photographed image to be close to a real scene. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an image processing method, applied to an image acquisition device, where the method includes:
when the image acquisition equipment captures an image to be shot, determining the current environment brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
if the corresponding relation between the sensitivity and the gain value of the specified gain item under the current ambient brightness does not have the target gain value corresponding to the current sensitivity, selecting a first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity from the corresponding relation;
calculating the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
And shooting the image to be shot according to the target gain value to obtain a target image.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value and the current digital gain value;
before the determining the current sensitivity based on the current sensor gain, the method further comprises:
determining a current ISP gain value of the image acquisition device;
the determining the current sensitivity based on the current sensor gain includes:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and a designated amplification factor as the current sensitivity.
Optionally, in a specific implementation manner, the calculating the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity includes:
if the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; the first preset formula is as follows:
Wherein the said
Characterizing said target gain value, said +.>
Characterizing said first gain value, said +.>
Characterizing said second gain value, said +.>
Characterizing the describedCurrent sensitivity, the->
Characterizing said first sensitivity, said +.>
Characterizing the second sensitivity;
if the first gain value is larger than the second gain value, calculating the target gain value by using a second preset formula;
wherein, the second preset formula is:
and if the first gain value is equal to the second gain value, calculating the target gain value by using the first preset formula or the second preset formula.
In a second aspect, an embodiment of the present application provides an image processing apparatus, applied to an image capturing device, including:
the parameter determining module is used for determining the current environment brightness and the current sensor gain when the image acquisition equipment captures an image to be shot;
the sensitivity determining module is used for determining the current sensitivity based on the current sensor gain;
the parameter selection module is used for selecting a first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity in the corresponding relation if the target gain value corresponding to the current sensitivity does not exist in the corresponding relation of the sensitivity and the gain value of the designated gain item under the current environment brightness;
A gain value calculation module configured to calculate the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
and the image acquisition module is used for shooting the image to be shot according to the target gain value to obtain a target image.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value and the current digital gain value;
the apparatus further comprises:
an ISP gain value determining module configured to determine a current ISP gain value of the image capturing device before the determining of the current sensitivity based on the current sensor gain;
the photosensitivity determining module is specifically used for:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and a designated amplification factor as the current sensitivity.
Optionally, in a specific implementation manner, the gain value calculating module is specifically configured to:
If the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; the first preset formula is as follows:
wherein the said
Characterizing said target gain value, said +.>
Characterizing said first gain value, said +.>
Characterizing said second gain value, said +.>
Characterizing said current sensitivity, said ++>
Characterizing said first sensitivity, said +.>
Characterizing the second sensitivity;
if the first gain value is larger than the second gain value, calculating the target gain value by using a second preset formula;
wherein, the second preset formula is:
and if the first gain value is equal to the second gain value, calculating the target gain value by using the first preset formula or the second preset formula.
In a third aspect, an embodiment of the present application provides an image capturing device, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
and a processor for implementing the steps of any one of the image processing methods provided in the first aspect when executing the program stored in the memory.
In a fourth aspect, embodiments of the present application provide a computer readable medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the image processing methods provided in the first aspect above.
In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the steps of any of the image processing methods described in the first aspect above.
The beneficial effects of the embodiment of the application are that:
as can be seen from the above, by applying the scheme provided in the embodiment of the present application, the correspondence relationship between the sensitivity and the gain value of different gain items is different under different environmental brightnesses, so that the correspondence relationship between the sensitivity and the gain value of the specified gain item under different environmental brightnesses can be set in the image capturing device in advance. In this way, when the image capturing apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image capturing apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain described above. If there is no target gain value corresponding to the current sensitivity in the correspondence relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has the smallest difference with the current sensitivity may be selected in the correspondence relation. Then, a target gain value corresponding to the current sensitivity is calculated using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity. Thus, the image acquisition device can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, when the scheme provided by the embodiment of the application is applied, after determining the current ambient brightness and the current sensitivity of the image to be shot, and the corresponding relation of the current sensitivity does not exist in the corresponding relation of the specified gain item on the sensitivity and the gain value under the current ambient brightness, the image acquisition device may select a first gain value corresponding to a first sensitivity which is greater than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is less than the current sensitivity and has the smallest difference with the current sensitivity from the corresponding relations. In this way, the target gain value used when the image to be shot is shot can be obtained through calculation through the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity, so that the image to be shot is shot according to the target gain value, the image quality of the target image of the image to be shot is further improved, and the picture presentation effect of the target image is close to a real scene.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
Fig. 1 is a schematic flow chart of an image processing method according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a specific embodiment provided in the present application;
fig. 3 is a schematic structural diagram of an image processing apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an image capturing device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
In the related art, a plurality of brightness levels may be divided in advance, and an image parameter configuration file corresponding to a different sensing degree is set under each brightness level. In this way, after the image acquisition device acquires the brightness information of the current environment by using the information of the AE (Auto Exposure) module, the brightness level to which the brightness information of the current environment belongs and the current sensitivity corresponding to the brightness information of the current environment can be determined, and then, the image parameter configuration file corresponding to the current sensitivity under the brightness level is called to adjust the image parameter configuration file so as to improve the image quality of the shot image, so that the shot image can be close to the real scene. However, in some cases, if the obtained image parameter configuration file corresponding to the current sensitivity does not exist under the current environment brightness, the parameter adjustment cannot be performed on the image acquisition device, so that the situation that the shot image still has a color cast of the picture exists, and the presentation effect of the whole picture deviates from the real scene.
In order to solve the above technical problems, an embodiment of the present application provides an image processing method.
The method can be suitable for various application scenes needing image shooting, for example, images are shot by using a mobile phone. For another example, an image is captured with a camera. The method can be applied to various image acquisition devices capable of image shooting, such as mobile phones, tablet computers, cameras and the like, and is hereinafter referred to as the image acquisition device. Based on this, the embodiment of the application does not limit the application scenario and execution subject of the method.
The image processing method provided by the embodiment of the application is applied to image acquisition equipment and can comprise the following steps:
when the image acquisition equipment captures an image to be shot, determining the current environment brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
if the corresponding relation between the sensitivity and the gain value of the specified gain item under the current ambient brightness does not have the target gain value corresponding to the current sensitivity, selecting a first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity from the corresponding relation;
Calculating the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
and shooting the image to be shot according to the target gain value to obtain a target image.
As can be seen from the above, by applying the scheme provided in the embodiment of the present application, the correspondence relationship between the sensitivity and the gain value of different gain items is different under different environmental brightnesses, so that the correspondence relationship between the sensitivity and the gain value of the specified gain item under different environmental brightnesses can be set in the image capturing device in advance. In this way, when the image capturing apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image capturing apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain described above. If there is no target gain value corresponding to the current sensitivity in the correspondence relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has the smallest difference with the current sensitivity may be selected in the correspondence relation. Then, a target gain value corresponding to the current sensitivity is calculated using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity. Thus, the image acquisition device can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, by applying the scheme provided in the embodiment of the present application, after determining the current ambient brightness and the current sensitivity of the image to be shot, when there is no corresponding relation corresponding to the current sensitivity in the corresponding relation between the specified gain item and the gain value in the current ambient brightness, the image capturing device may select, from the corresponding relation, a first gain value that is greater than the current sensitivity and corresponds to a first sensitivity with a minimum difference between the current sensitivity and a second gain value that is less than the current sensitivity and corresponds to a second sensitivity with a minimum difference between the current sensitivity. In this way, the target gain value used when the image to be shot is shot can be obtained through calculation through the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity, so that the image to be shot is shot according to the target gain value, the image quality of the target image of the image to be shot is further improved, and the picture presentation effect of the target image is close to a real scene.
An image processing method provided in the embodiment of the present application is specifically described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of an image processing method according to an embodiment of the present application, as shown in fig. 1, the method may include the following steps S101 to S105.
S101: when the image acquisition equipment captures an image to be shot, determining the current environment brightness and the current sensor gain;
s102: the current sensitivity is determined based on the current sensor gain.
In general, when an image is captured by using an image capturing device, due to the illumination intensity in the environment where the image capturing device is located, the captured image may have problems that the red and blue gain is biased, the color saturation is not adapted to the current environment, the brightness of the picture is not adapted to the current environment, and the like, so that the situation that the captured image has picture color cast is caused, and the presenting effect of the whole picture deviates from the real scene.
Therefore, when the image acquisition device captures the image to be shot, the image acquisition device can determine the current environment brightness and the current sensor gain when the image to be shot is captured.
When the image capturing device captures the image to be captured, the image capturing device refers to a time when the image to be captured exists in the viewfinder of the image capturing device, but the image to be captured is not captured.
Alternatively, the current ambient brightness and the current sensor gain are acquired using information of an AE (Auto Exposure) module installed in the image pickup apparatus.
Among them, the AE module is used to obtain the best image quality by automatically configuring a lens aperture, a sensor shutter, and a gain according to the exposure of the current image obtained by the automatic photometry system.
The sensor is used for realizing the function that when a photosensitive unit in the sensor of the image acquisition device receives external light stimulus, a certain electric signal is generated based on the photoelectric effect, so that external information can be displayed in a view-finding frame of the image acquisition device after the generated electric signal is processed.
In this way, the current sensitivity of the image capturing apparatus at the time of capturing the image to be captured can be determined based on the determined current sensor gain.
Optionally, in a specific implementation, the current sensor gain includes: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
In general, the current sensitivity of the image capturing apparatus at the time of capturing an image to be captured may be determined using the current analog gain value, the current digital gain value, and the current ISP (Image Signal Processor ) gain value of the image capturing apparatus.
Optionally, in a specific implementation, the current sensor gain includes: a current analog gain value of the sensor and a current digital gain value of the sensor; before the step S102, the image processing method provided in the embodiment of the present application may further include step 11:
step 11: a current ISP gain value of the image acquisition device is determined.
Accordingly, in this specific implementation manner, the step S102 may include step 1021:
step 1021: and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and the appointed amplification factor as the current sensitivity.
In this embodiment, each gain value is usually a unit number or a fraction, and only when the current environment in which the image capturing device is located is particularly dark, each gain value reaches a two-digit number. The value range of the sensitivity is increased upwards based on hundred digits, that is, the value of the sensitivity is minimum to be 100, so that each gain value can be amplified by using a specified amplification factor with a larger value, for example, the specified amplification factor is 100, so that the calculated value of the current sensitivity accords with the value range of the sensitivity.
Therefore, after determining the current analog gain value, the current digital gain value, and the current ISP gain value of the image pickup device, the product of the current analog gain value, the current digital gain value, the current ISP gain value, and the specified amplification factor can be calculated as the current sensitivity.
For example, the current sensitivity is calculated using a first formula. The first formula above may be expressed as:
wherein, the liquid crystal display device comprises a liquid crystal display device,
characterizing the current sensitivity +.>
A current analog gain value characterizing the sensor, < +.>
A current digital gain value characterizing the sensor, < >>
Characterizing the current ISP gain value, ">
The specified magnification factor is characterized.
Exemplary, image acquisitionWhen the device A captures an image to be shot, the current analog gain value of a sensor is 2, the current digital gain value of the sensor is 3, the current ISP gain value is 1, the appointed amplification factor is 100, and the current sensitivity of the image acquisition device is
。
S103: if the corresponding relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness does not exist the target gain value corresponding to the current sensitivity, selecting a first gain value corresponding to the first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to the second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity from the corresponding relation.
In general, when an image is captured by using an image capturing device, due to the illumination intensity in the environment where the image capturing device is located, the captured image may have problems that the red and blue gain is biased, the color saturation is not adapted to the current environment, the brightness of the picture is not adapted to the current environment, and the like, so that the situation that the captured image has picture color cast is caused, and the presenting effect of the whole picture deviates from the real scene.
Therefore, in order to improve the image processing efficiency, the correspondence relation of the sensitivity and the gain value with respect to the specified gain item at different ambient brightness may be set in the image pickup apparatus in advance.
For example, under the same ambient brightness, establishing a corresponding relation between sensitivity and gain value for a gain item of red-blue gain; establishing a corresponding relation between the sensitivity and a gain value aiming at a gain item of the color saturation; for the gain item of the screen brightness, a corresponding relation between the sensitivity and the gain value is established.
Thus, the image acquisition device can determine the corresponding relation between the sensitivity and the gain value of the designated gain item under the current environment brightness in the corresponding relation after determining the current environment brightness and the current sensitivity, and judge whether the target gain value corresponding to the current sensitivity exists in the determined corresponding relation between the sensitivity and the gain value.
If there is no target gain value corresponding to the current sensitivity in the correspondence relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness, the image capturing apparatus may select, as the basic data for calculating the target gain value corresponding to the current sensitivity, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has a minimum difference from the current sensitivity, and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has a minimum difference from the current sensitivity.
For example, the correspondence relation of the sensitivity and the gain value of the gain item of the red-blue gain at the ambient brightness a set in the image pickup apparatus a includes: gain value a1 corresponding to sensitivity 100, gain value a2 corresponding to sensitivity 200, and gain value a3 corresponding to sensitivity 400; the correspondence relation between the sensitivity and the gain value at the ambient brightness b includes: gain value b1 for sensitivity 200, gain value b2 for sensitivity 400, and gain value b3 for sensitivity 800.
If the current ambient brightness of the image capturing apparatus a when capturing the image to be captured is the ambient brightness a, the current sensitivity is the sensitivity 150. At this time, in the correspondence between the sensitivity and the gain value of the gain item of the red and blue gain under the ambient brightness a, there is no target gain value corresponding to the sensitivity 150, and the image capturing apparatus a may select the sensitivity 100 as the first sensitivity, the gain value a1 corresponding to the sensitivity 100 as the first gain value, the sensitivity 200 as the second sensitivity, and the gain value a2 corresponding to the sensitivity 200 as the second gain value in the correspondence.
Optionally, if there is a target gain value corresponding to the current sensitivity in the correspondence between the sensitivity and the gain value of the specified gain item under the current ambient brightness, the image capturing apparatus may determine the gain value corresponding to the current sensitivity in the correspondence as the target gain value.
For example, on the basis of the above example, if the current ambient brightness of the image capturing apparatus a at the time of capturing an image to be captured is the ambient brightness b, the current sensitivity is the sensitivity 800. At this time, in the correspondence between the sensitivity and the gain value of the gain item of the red-blue gain under the ambient brightness a, there is a target gain value corresponding to the sensitivity 800, and the image capturing apparatus a may determine the gain value b3 as the target gain value corresponding to the current sensitivity.
S104: the target gain value is calculated using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity.
After determining the first sensitivity, the first gain value, the second sensitivity and the second gain value, the image acquisition device can calculate a target gain value corresponding to the current sensitivity by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the determined current sensitivity.
In general, a gain value corresponding to the sensitivity changes with a change in the sensitivity, for example, the gain value increases in proportion to an increase in the sensitivity value. For another example, the gain value decreases in proportion to an increase in the sensing value, and the like.
That is, there may be three cases of the magnitude relation between the gain value corresponding to the larger sensitivity and the gain value of the smaller sensitivity:
(1) The gain value corresponding to the larger sensitivity is smaller than the gain value corresponding to the smaller sensitivity;
(2) The gain value corresponding to the larger sensitivity is larger than the gain value corresponding to the smaller sensitivity;
(3) The gain value corresponding to the larger sensitivity is equal to the gain value corresponding to the smaller sensitivity.
For the embodiment of the present application, that is, the magnitude relation between the first gain value corresponding to the first sensitivity and the second gain value corresponding to the second sensitivity may include:
(1) The first gain value is smaller than the second gain value;
(2) The first gain value is greater than the second gain value;
(3) The first gain value is equal to the second gain value.
Therefore, after the first gain value and the second gain value are determined, a corresponding formula can be selected based on the numerical relationship between the first gain value and the second gain value, and the target gain value can be calculated.
Based on this, in an optional implementation manner, the step S104 may include the following steps 1041-1043:
step 1041: if the first gain value is smaller than the second gain value, calculating a target gain value by using a first preset formula; the first preset formula is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
characterizing a target gain value, +.>
Characterizing a first gain value, ">
Characterizing a second gain value, ">
Characterizing the current sensitivity +.>
Characterizing the first sensitivity,/->
The second sensitivity is characterized.
Step 1042: if the first gain value is larger than the second gain value, calculating a target gain value by using a second preset formula;
the second preset formula is as follows:
step 1043: if the first gain value is equal to the second gain value, calculating a target gain value by using a first preset formula or a second preset formula.
In this embodiment, when calculating the target gain value by using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity, the target gain value may be calculated by using a corresponding preset formula through a numerical relationship between the first gain value and the second gain value.
(1) If the first gain value is smaller than the second gain value, the target gain value can be calculated by using a first preset formula.
For example, if the determined first sensitivity is 100, the first gain value is 300, the second sensitivity is 200, the second gain value is 600, and the current sensitivity is 150. At this time, the first gain value is smaller than the second gain value, and the target gain value is calculated by using a first preset formula
。
(2) If the first gain value is greater than the second gain value, the target gain value may be calculated using a second predetermined formula.
For example, if the determined first sensitivity is 100, the first gain value is 600, the second sensitivity is 200, the second gain value is 300, and the current sensitivity is 150. At this time, the first gain value is larger than the second gain value, and the target gain value is calculated by using a second preset formula
。
(3) If the first gain value is equal to the second gain value, the target gain value may be calculated using the first preset formula or the second preset formula.
When the first gain value is equal to the second gain value, if the first preset formula is used, the calculated target gain value is
。
If the second preset formula is used, the calculated target gain value is
。
In this case, since the sensitivity is generally multiplied, for example, 100, 200, 400, 800, or the like, the sensitivity is changed. Thus, the above 
. However, the image acquisition apparatus generally performs integer division at the time of division calculation, and therefore, the above +.>
The calculation result obtained in the image acquisition apparatus is 0.
That is, when the first gain value is equal to the second gain value, the first preset formula or the second preset formula is utilized to obtain the following results
. Therefore, when the first gain value is equal to the second gain value, one formula may be selected from the first preset formula and the second preset formula, and the target gain value may be calculated.
In some cases, to characterize the positional relationship between the first sensitivity, the second sensitivity, and the current sensitivity, one can use
Characterizing the second sensitivity and using +.>
The first sensitivity is characterized, wherein,
the characterization shifts forward by one bit on the basis of the second sensitivity, i.e. the first sensitivity.
At this time, the first preset formula may be expressed as:
similarly, the second preset formula may be expressed as:
wherein, the liquid crystal display device comprises a liquid crystal display device,
characterizing the second sensitivity,/->
The first sensitivity is characterized.
S105: and shooting the image to be shot according to the target gain value to obtain a target image.
After the calculated target gain value corresponding to the current sensitivity is reached, the image acquisition device can determine the target gain value corresponding to the current sensitivity of the designated gain item under the current ambient brightness, so that the image to be shot can be shot by utilizing the target gain value, and the target image is obtained.
Alternatively, the above specified gain items may include at least one of a gain item for red-blue gain, a gain item for color saturation, and a gain item for screen brightness.
For example, after the target gain value corresponding to the current sensitivity of the gain item for the red and blue gain under the current ambient brightness is calculated, the gain item for the red and blue gain can be gained when the image acquisition device shoots the image to be shot, so that the image quality of the target image of the image to be shot is improved, and the presentation effect of the obtained picture of the target image is close to a real scene.
For another example, after the target gain value corresponding to the current sensitivity of the gain item for the red and blue gain and the target gain value corresponding to the current sensitivity of the gain item for the color saturation are obtained by calculation, when the image capturing device captures the image to be captured, the gain item for the red and blue gain and the gain item for the color saturation can be obtained, so that the image quality of the target image of the image to be captured is improved, and the obtained image presentation effect of the target image is close to the real scene.
For another example, after the target gain value corresponding to the current sensitivity of the gain item for the red and blue gain, the target gain value corresponding to the current sensitivity of the gain item for the color saturation, and the target gain value corresponding to the current sensitivity of the gain item for the picture brightness are obtained by calculation, when the image capturing device captures the image to be captured, the gain item for the red and blue gain, the gain item for the color saturation, and the gain item for the picture brightness can be obtained, so that the image quality of the target image of the image to be captured is improved, and the obtained picture presentation effect of the target image is close to the real scene.
In order to facilitate understanding of an image processing method provided in the embodiments of the present application, as shown in fig. 2, a flowchart of a specific embodiment of the embodiments of the present application is shown.
As shown in fig. 2, this particular embodiment may include the following steps S201-S204.
S201: acquiring a current ISO (sensitivity) and an environment brightness value by using an AE module;
s202: acquiring an interval of a linkage array where a current ISO value is located according to the current ISO;
s203: according to the current ISO and the linkage array, linear interpolation is carried out to obtain linkage parameter values under the current ISO;
S204: and performing compensation setting.
Step S201 is to acquire current ambient brightness and current sensor gain by using information of an AE module installed in the image acquisition device in the embodiment of the present application; step 202 is selecting, in the corresponding relation of the embodiment of the present application, a first gain value that is greater than the current sensitivity and corresponds to a first sensitivity with a minimum difference between the current sensitivity and a second gain value that is less than the current sensitivity and corresponds to a second sensitivity with a minimum difference between the current sensitivity; step S203 is to calculate a target gain value according to the embodiment of the present application by using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity; step S204 is shooting the image to be shot according to the target gain value in the embodiment of the present application.
When capturing an image to be captured, the image acquisition device can acquire a current ISO and an environment brightness value by utilizing the information of the installed AE module, then, based on the current ISO, a gain value which is larger than the current ISO and corresponds to the ISO with the smallest difference value of the current ISO and a linkage array which is smaller than the current ISO and corresponds to the ISO with the smallest difference value of the current ISO are acquired, so that the linkage parameter value under the current ISO is obtained through linear interpolation according to the current ISO and the acquired linkage array, and further, the image acquisition device can capture the image to be captured according to the obtained linkage parameter value, further, the image quality of a target image of the image to be captured is improved, and the picture presentation effect of the target image is close to a real scene.
As can be seen from the above, by applying the scheme provided in the embodiment of the present application, the correspondence relationship between the sensitivity and the gain value of different gain items is different under different environmental brightnesses, so that the correspondence relationship between the sensitivity and the gain value of the specified gain item under different environmental brightnesses can be set in the image capturing device in advance. In this way, when the image capturing apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image capturing apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain described above. If there is no target gain value corresponding to the current sensitivity in the correspondence relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has the smallest difference with the current sensitivity may be selected in the correspondence relation. Then, a target gain value corresponding to the current sensitivity is calculated using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity. Thus, the image acquisition device can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, by applying the scheme provided in the embodiment of the present application, after determining the current ambient brightness and the current sensitivity of the image to be shot, when there is no corresponding relation corresponding to the current sensitivity in the corresponding relation between the specified gain item and the gain value in the current ambient brightness, the image capturing device may select, from the corresponding relation, a first gain value that is greater than the current sensitivity and corresponds to a first sensitivity with a minimum difference between the current sensitivity and a second gain value that is less than the current sensitivity and corresponds to a second sensitivity with a minimum difference between the current sensitivity. In this way, the target gain value used when the image to be shot is shot can be obtained through calculation through the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity, so that the image to be shot is shot according to the target gain value, the image quality of the target image of the image to be shot is further improved, and the picture presentation effect of the target image is close to a real scene.
Corresponding to the image processing method provided by the embodiment of the application, the embodiment of the application also provides an image processing device which is applied to the image acquisition equipment.
Fig. 3 is a schematic structural diagram of an image processing apparatus according to an embodiment of the present application, and as shown in fig. 3, the apparatus may include the following modules:
a parameter determining module 310, configured to determine a current ambient brightness and a current sensor gain when the image capturing device captures an image to be captured;
a sensitivity determining module 320, configured to determine a current sensitivity based on the current sensor gain;
the parameter selection module 330 is configured to, if there is no target gain value corresponding to the current sensitivity in the correspondence between the sensitivity and the gain value of the specified gain item under the current ambient brightness, select, in the correspondence, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has a minimum difference with the current sensitivity, and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has a minimum difference with the current sensitivity;
a gain value calculating module 340, configured to calculate the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
and the image obtaining module 350 is configured to capture the image to be captured according to the target gain value, so as to obtain a target image.
As can be seen from the above, by applying the scheme provided in the embodiment of the present application, the correspondence relationship between the sensitivity and the gain value of different gain items is different under different environmental brightnesses, so that the correspondence relationship between the sensitivity and the gain value of the specified gain item under different environmental brightnesses can be set in the image capturing device in advance. In this way, when the image capturing apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image capturing apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain described above. If there is no target gain value corresponding to the current sensitivity in the correspondence relation between the sensitivity and the gain value of the designated gain item under the current ambient brightness, a first gain value corresponding to a first sensitivity that is greater than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity that is less than the current sensitivity and has the smallest difference with the current sensitivity may be selected in the correspondence relation. Then, a target gain value corresponding to the current sensitivity is calculated using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity. Thus, the image acquisition device can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, by applying the scheme provided in the embodiment of the present application, after determining the current ambient brightness and the current sensitivity of the image to be shot, when there is no corresponding relation corresponding to the current sensitivity in the corresponding relation between the specified gain item and the gain value in the current ambient brightness, the image capturing device may select, from the corresponding relation, a first gain value that is greater than the current sensitivity and corresponds to a first sensitivity with a minimum difference between the current sensitivity and a second gain value that is less than the current sensitivity and corresponds to a second sensitivity with a minimum difference between the current sensitivity. In this way, the target gain value used when the image to be shot is shot can be obtained through calculation through the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity, so that the image to be shot is shot according to the target gain value, the image quality of the target image of the image to be shot is further improved, and the picture presentation effect of the target image is close to a real scene.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
Optionally, in a specific implementation manner, the current sensor gain includes: the current analog gain value and the current digital gain value;
the apparatus further comprises:
an ISP gain value determining module configured to determine a current ISP gain value of the image capturing device before the determining of the current sensitivity based on the current imaging sensor gain;
the sensitivity determining module 320 is specifically configured to:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and a designated amplification factor as the current sensitivity.
Optionally, in a specific implementation manner, the gain value calculating module 340 is specifically configured to:
if the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; the first preset formula is as follows:
wherein the said
Characterizing said target gain value, said +.>
Characterizing said first gain value, said +.>
Characterizing said second gain value, said +.>
Characterizing said current sensitivity, said ++>
Characterizing said first sensitivity, said +.>
Characterizing the second sensitivity;
if the first gain value is larger than the second gain value, calculating the target gain value by using a second preset formula;
Wherein, the second preset formula is:
and if the first gain value is equal to the second gain value, calculating the target gain value by using the first preset formula or the second preset formula.
Corresponding to the image processing method provided in the embodiment of the present application, the embodiment of the present application further provides an electronic device, as shown in fig. 4, including a processor 401, a communication interface 402, a memory 403, and a communication bus 404, where the processor 401, the communication interface 402, and the memory 403 complete communication with each other through the communication bus 404,
a memory 403 for storing a computer program;
the processor 401 is configured to implement the steps of any one of the image processing methods provided in the embodiments of the present application when executing the program stored in the memory 403.
The communication bus mentioned above for the electronic devices may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, etc. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.
The communication interface is used for communication between the electronic device and other devices.
The Memory may include random access Memory (Random Access Memory, RAM) or may include Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.
The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
In yet another embodiment provided herein, there is also provided a computer-readable storage medium having stored therein a computer program which, when executed by a processor, implements the steps of any of the image processing methods described above.
In yet another embodiment provided herein, there is also provided a computer program product containing instructions that, when run on a computer, cause the computer to perform any of the image processing methods of the above embodiments.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, with regard to the image acquisition apparatus embodiments, the device embodiments, the computer-readable storage medium embodiments, and the computer program product embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference should be made to the partial description of the method embodiments for relevant points.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (10)
1. An image processing method, characterized by being applied to an image acquisition apparatus, the method comprising:
when the image acquisition equipment captures an image to be shot, determining the current environment brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
if the corresponding relation between the sensitivity and the gain value of the specified gain item under the current ambient brightness does not have the target gain value corresponding to the current sensitivity, selecting a first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity from the corresponding relation;
calculating the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
And shooting the image to be shot according to the target gain value to obtain a target image.
2. The method of claim 1, wherein the current sensor gain comprises: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
3. The method of claim 2, wherein the current sensor gain comprises: the current analog gain value and the current digital gain value;
before the determining the current sensitivity based on the current sensor gain, the method further comprises:
determining a current ISP gain value of the image acquisition device;
the determining the current sensitivity based on the current sensor gain includes:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and a designated amplification factor as the current sensitivity.
4. The method of claim 1, wherein said calculating said target gain value using said first sensitivity, said first gain value, said second sensitivity, said second gain value, and said current sensitivity comprises:
if the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; the first preset formula is as follows:
Wherein the said
Characterizing said target gain value, said +.>
Characterizing said first gain value, said +.>
Characterizing said second gain value, said +.>
Characterizing said current sensitivity, said ++>
Characterizing said first sensitivity, said +.>
Characterizing the second sensitivity;
if the first gain value is larger than the second gain value, calculating the target gain value by using a second preset formula;
wherein, the second preset formula is:
and if the first gain value is equal to the second gain value, calculating the target gain value by using the first preset formula or the second preset formula.
5. An image processing apparatus, characterized by being applied to an image acquisition device, comprising:
the parameter determining module is used for determining the current environment brightness and the current sensor gain when the image acquisition equipment captures an image to be shot;
the sensitivity determining module is used for determining the current sensitivity based on the current sensor gain;
the parameter selection module is used for selecting a first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the smallest difference with the current sensitivity and a second gain value corresponding to a second sensitivity which is smaller than the current sensitivity and has the smallest difference with the current sensitivity in the corresponding relation if the target gain value corresponding to the current sensitivity does not exist in the corresponding relation of the sensitivity and the gain value of the designated gain item under the current environment brightness;
A gain value calculation module configured to calculate the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity;
and the image acquisition module is used for shooting the image to be shot according to the target gain value to obtain a target image.
6. The apparatus of claim 5, wherein the current sensor gain comprises: the current analog gain value of the sensor and/or the current digital gain value of the sensor.
7. The apparatus of claim 6, wherein the current sensor gain comprises: the current analog gain value and the current digital gain value;
the apparatus further comprises:
an ISP gain value determining module configured to determine a current ISP gain value of the image capturing device before the determining of the current sensitivity based on the current sensor gain;
the photosensitivity determining module is specifically used for:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and a designated amplification factor as the current sensitivity.
8. The apparatus of claim 5, wherein the gain value calculation module is specifically configured to:
If the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; the first preset formula is as follows:
wherein the said
Characterizing said target gain value, said +.>
Characterizing said first gain value, said +.>
Characterizing said second gain value, said +.>
Characterizing said current sensitivity, said ++>
Characterizing said first sensitivity, said +.>
Characterizing the second sensitivity;
if the first gain value is larger than the second gain value, calculating the target gain value by using a second preset formula;
wherein, the second preset formula is:
and if the first gain value is equal to the second gain value, calculating the target gain value by using the first preset formula or the second preset formula.
9. The image acquisition equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for carrying out the method steps of any one of claims 1-4 when executing a program stored on a memory.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program which, when executed by a processor, implements the method steps of any of claims 1-4.
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