CN115665557A - 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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- CN115665557A CN115665557A CN202211687843.4A CN202211687843A CN115665557A CN 115665557 A CN115665557 A CN 115665557A CN 202211687843 A CN202211687843 A CN 202211687843A CN 115665557 A CN115665557 A CN 115665557A
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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 the current ambient brightness and the current sensor gain when an image to be shot is captured by the image acquisition equipment; determining a current sensitivity based on a current sensor gain; 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 specified gain item under the current environment 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 method and the device for improving the image quality can improve the image quality, so that the picture presentation effect of the shot image is close to a real scene.
Description
Technical Field
The present application relates to the field of image processing technologies, and in particular, to an image processing method and apparatus, and an image capturing device.
Background
With the continuous development of science and technology, a user can shoot images or videos by using an image acquisition device. For example, image capturing is performed in different lighting environments. However, when the ambient brightness is low, the whole captured color image may show a color cast, which causes the appearance of the whole picture to deviate from the real scene.
In the related art, a plurality of brightness levels may be divided in advance, and an image parameter configuration file corresponding to different sensitivities is set in 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 at 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 the above related art, in some cases, if there is no image parameter configuration file corresponding to the current sensitivity under the current ambient brightness, the parameter adjustment cannot be performed on the image capturing device, so that the situation of picture color cast still exists in the captured image, 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 apparatus, and an image capturing device, so as to improve image quality, and enable a presentation effect of a picture of a captured 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, which is applied to an image acquisition device, and the method includes:
when an image to be shot is captured by the image acquisition equipment, determining the current ambient brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
if the corresponding relation of the sensitivity and the gain value of the specified gain item under the current environment brightness does not have a target gain value corresponding to the current sensitivity, selecting a first gain value which is larger than the current sensitivity and corresponds to a first sensitivity with the minimum difference value of the current sensitivity and a second gain value which is smaller than the current sensitivity and corresponds to a second sensitivity with the minimum difference value of the current sensitivity in 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: a current analog gain value of the sensor and/or a 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;
prior to the determining a current sensitivity based on the current sensor gain, the method further comprises:
determining a current ISP gain value of the image acquisition equipment;
the determining a current sensitivity based on the current sensor gain comprises:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and the specified amplification factor as the current sensitivity.
Optionally, in a specific implementation manner, the 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 includes:
if the first gain value is smaller than the second gain value, calculating the target gain value by using a first preset formula; wherein the first preset formula is as follows:
wherein, the
Characterizing the target gain value, the
Characterizing the first gain value, the
Characterizing the second gain value, said
Characterizing the current sensitivity, the
Characterizing the first sensitivity, the
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 as follows:
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, which is applied to an image capturing device, and the apparatus includes:
the parameter determining module is used for determining the current ambient brightness and the current sensor gain when the image acquisition equipment captures an image to be shot;
a sensitivity determination module to determine a current sensitivity based on the current sensor gain;
a parameter selection module, configured to select, if there is no target gain value corresponding to the current sensitivity in a correspondence between sensitivity and gain values of a given 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 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, in the correspondence;
a gain value calculation module for 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 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: a current analog gain value of the sensor and/or a 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 device further comprises:
an ISP gain value determination module for determining a current ISP gain value of the image capture device before determining a current sensitivity based on the current sensor gain;
the sensitivity determination module 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 the specified amplification coefficient 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; wherein the first preset formula is as follows:
wherein, the
Characterizing the target gain value, the
Characterizing the first gain value, the
Characterizing the second gain value, said
Characterizing the current sensitivity, the
Characterizing the first sensitivity, the
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 mutual communication through the communication bus;
a memory for storing a computer program;
a processor, configured to implement the steps of any of the image processing methods provided by the first aspect when executing the program stored in the memory.
In a fourth aspect, the present application provides a computer-readable medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of any one of the image processing methods provided in the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product containing 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 embodiment of the application has the following beneficial effects:
as can be seen from the above, according to the scheme provided by the embodiment of the present application, since the corresponding relationship between the sensitivity and the gain value of different gain items is different under different ambient luminances, the corresponding relationship between the sensitivity and the gain value of a given gain item under different ambient luminances can be set in the image capturing apparatus in advance. In this way, when the image pickup apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image pickup apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain. If there is no target gain value corresponding to the current sensitivity in the correspondence 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 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 may be selected from the correspondence. Then, a target gain value corresponding to the current sensitivity is calculated by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity. Therefore, the image acquisition equipment can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, with the solution provided by the embodiment of the present application, when the image capturing apparatus does not have a corresponding relationship corresponding to the current sensitivity in the corresponding relationship between the sensitivity and the gain value of the specified gain item under the current ambient brightness after determining the current ambient brightness and the current sensitivity of the image to be captured, the image capturing apparatus may select, from the corresponding relationships, 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. Therefore, the target gain value utilized when the image to be shot is shot can be calculated 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 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 drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also obvious for a person skilled in the art to obtain other embodiments according to the drawings.
Fig. 1 is a schematic flowchart of an image processing method according to an embodiment of the present application;
fig. 2 is a schematic flow chart diagram of an 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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.
In the related art, a plurality of luminance levels may be divided in advance, and an image parameter configuration file corresponding to different sensitivities is set in each luminance 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, it may determine 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, and then call the image parameter configuration file corresponding to the current sensitivity at the brightness level to adjust itself, so as to improve the image quality of the captured image, so that the captured image may be close to the real scene. However, in the above related art, in some cases, if there is no image parameter configuration file corresponding to the current sensitivity under the current ambient brightness, the parameter adjustment cannot be performed on the image capturing device, so that the situation of picture color cast still exists in the captured image, and the presentation effect of the whole picture deviates from the real scene.
In order to solve the above technical problem, an embodiment of the present application provides an image processing method.
The method can be applied to various application scenes needing image shooting, for example, shooting images by using a mobile phone. For another example, an image is captured by a camera. In addition, the method can be applied to various image acquisition devices capable of shooting images, such as mobile phones, tablet computers, cameras and the like, and is hereinafter referred to as image acquisition devices for short. Based on this, the application scenario and the execution subject of the method are not limited in the embodiments of the present application.
The image processing method provided by the embodiment of the application is applied to image acquisition equipment and can comprise the following steps:
when an image to be shot is captured by the image acquisition equipment, determining the current ambient brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
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 specified gain item under the current environment brightness, selecting a first gain value corresponding to a first sensitivity which is greater than the current sensitivity and has the minimum difference with the current sensitivity and a second gain value which is less than the current sensitivity and has the minimum 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, according to the scheme provided by the embodiment of the present application, since the corresponding relationship between the sensitivity and the gain value of different gain items is different under different ambient luminances, the corresponding relationship between the sensitivity and the gain value of a given gain item under different ambient luminances can be set in the image capturing apparatus in advance. In this way, when the image pickup apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image pickup apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain. If there is no target gain value corresponding to the current sensitivity in the corresponding relationship between the sensitivity and the gain value of the specified gain item under the current environmental brightness, 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 may be selected from the corresponding relationship. Then, a target gain value corresponding to the current sensitivity is calculated by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity. Therefore, the image acquisition equipment can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, with the scheme provided by the embodiment of the present application, after determining the current ambient brightness and the current sensitivity of the image to be captured, when there is no corresponding relationship corresponding to the current sensitivity in the corresponding relationship between the sensitivity and the gain value of the specified gain item under the current ambient brightness, the image capturing device may select, among the corresponding relationships, 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. Therefore, the target gain value used when the image to be shot is shot can be calculated 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 improved, and the picture presenting effect of the target image is close to a real scene.
An image processing method provided in an embodiment of the present application is specifically described below with reference to the accompanying drawings.
Fig. 1 is a schematic flowchart of an image processing method according to an embodiment of the present application, and as shown in fig. 1, the method may include the following steps S101 to S105.
S101: when an image to be shot is captured by the image acquisition equipment, determining the current ambient brightness and the current sensor gain;
s102: based on the current sensor gain, a current sensitivity is determined.
Generally, when an image is shot by using an image capturing device, due to the illumination intensity in the environment where the image capturing device is located, the shot image may have problems that the red and blue gains are deviated, the color saturation is not suitable for the current environment, the picture brightness is not suitable for the current environment, and the like, so that the shot image has a picture color deviation condition, and the presentation effect of the whole picture deviates from a real scene.
Therefore, when the image to be photographed is captured by the image capturing device, the image capturing device may determine the current ambient brightness at which the image to be photographed is captured, and the current sensor gain.
The image capturing device captures the image to be captured, which means that the image to be captured exists in a viewfinder frame of the image capturing device, but the image to be captured is not captured at the moment.
Alternatively, the current ambient brightness and the current sensor gain are acquired using information of an AE (Auto Exposure) module installed in the image capture apparatus.
The AE module obtains the exposure of the current image according to the automatic light measuring system, and then automatically configures the lens aperture, the sensor shutter and the gain to obtain the best image quality.
The function realized by the sensor is that after the photosensitive unit in the sensor of the image acquisition equipment receives external light stimulation, a certain electric signal is generated based on photoelectric effect, and therefore, after the generated electric signal is processed, external information can be displayed in a view frame of the image acquisition equipment.
In this way, the current sensitivity of the image capture device when 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: a current analog gain value of the sensor and/or a current digital gain value of the sensor.
In general, a current sensitivity of the Image pickup apparatus at the time of capturing an Image to be captured may be determined using a current analog gain value, a current digital gain value, and a current ISP (Image Signal Processor) gain value of the Image pickup apparatus.
Optionally, in a specific implementation manner, 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, an image processing method provided in the embodiment of the present application may further include the step 11:
step 11: a current ISP gain value for the image acquisition device is determined.
Accordingly, in this embodiment, the step S102 may include the 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 specified amplification factor as the current sensitivity.
In this specific implementation manner, in general, each of the gain values is a single digit or a decimal, and only when the current environment where the image capturing apparatus is located is especially dark, each of the gain values reaches two digits. The sensitivity range is increased upwards on the basis of the hundreds of digits, that is, the value of the sensitivity is 100 at the minimum, 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, and thus, the calculated current sensitivity value conforms to the sensitivity range.
Therefore, after the current analog gain value, the current digital gain value and the current ISP gain value of the image acquisition device are determined, 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, using a first formula, the current sensitivity is calculated. The first formula may be expressed as:
wherein the content of the first and second substances,
the present sensitivity is characterized by the presence of,
the current analog gain value of the sensor is characterized,
a current digital gain value characterizing the sensor,
the current ISP gain value is characterized,
the specified magnification factor is characterized.
For example, when the image capturing device a captures an image to be captured, the current analog gain value of the sensor is 2, the current digital gain value of the sensor is 3, the current ISP gain value is 1, the specified amplification factor is 100, and the current sensitivity of the image capturing device is then 2
。
S103: 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 first gain value corresponding to a first sensitivity which is larger than the current sensitivity and has the minimum difference with the current sensitivity and a second gain value which is smaller than the current sensitivity and has the minimum difference with the current sensitivity are selected in the corresponding relation.
Generally, when an image is shot by using an image capturing device, due to the illumination intensity in the environment where the image capturing device is located, the shot image may have problems that the red and blue gains are deviated, the color saturation is not suitable for the current environment, the picture brightness is not suitable for the current environment, and the like, so that the shot image has a picture color deviation condition, and the presentation effect of the whole picture deviates from a real scene.
Therefore, in order to improve image processing efficiency, the correspondence of the sensitivity to the gain value of the designated gain item at different ambient brightness may be set in advance in the image pickup apparatus.
For example, under the same ambient brightness, for the gain items of the red and blue gains, a corresponding relation between the sensitivity and the gain value is established; establishing a corresponding relation between sensitivity and a gain value aiming at a gain item of color saturation; and establishing a corresponding relation between sensitivity and a gain value aiming at the gain item of the picture brightness.
In this way, the image capturing apparatus may determine, after determining the current ambient brightness and the current sensitivity, a correspondence between sensitivity and a gain value of a given gain item under the current ambient brightness among the above correspondences, and determine whether a target gain value corresponding to the current sensitivity exists in the determined correspondence between sensitivity and gain value.
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, the image capturing apparatus may select, from the correspondence, 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, as basic data for calculating the target gain value corresponding to the current sensitivity.
For example, the correspondence relationship of the sensitivity to 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: a gain value a1 corresponding to sensitivity 100, a gain value a2 corresponding to sensitivity 200, and a gain value a3 corresponding to sensitivity 400; the correspondence relationship between sensitivity and gain value at the ambient brightness b includes: a gain value b1 corresponding to sensitivity 200, a gain value b2 corresponding to sensitivity 400, and a gain value b3 corresponding to sensitivity 800.
If the current ambient brightness of the image capturing apparatus a when capturing an image to be captured is the ambient brightness a, the current sensitivity is 150. At this time, in the correspondence relationship between the sensitivity and the gain value of the gain item of the red-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, in the correspondence relationship, 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.
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, as the target gain value, the gain value corresponding to the current sensitivity in the correspondence.
For example, on the basis of the above example, if the current ambient brightness of the image capturing apparatus a when capturing an image to be captured is the ambient brightness b, the current sensitivity is the sensitivity 800. At this time, in the correspondence relationship between the sensitivity and the gain value of the gain items of the red and blue gains 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 capturing apparatus may calculate a target gain value corresponding to the current sensitivity using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the determined current sensitivity.
In general, the gain value corresponding to the sensitivity varies with the change in the sensitivity, for example, the gain value increases in proportion to the increase in the numerical value of the sensitivity. For example, the gain value is decreased in proportion to an increase in the sensitivity value.
That is, the magnitude relationship between the gain value corresponding to the greater sensitivity and the gain value corresponding to the lesser sensitivity may exist in the following three cases:
(1) The gain value corresponding to the greater sensitivity is less than the gain value corresponding to the lesser sensitivity;
(2) The gain value corresponding to the greater sensitivity is greater than the gain value corresponding to the lesser sensitivity;
(3) The gain value corresponding to the greater sensitivity is equal to the gain value corresponding to the lesser sensitivity.
For the embodiment of the present application, the magnitude relationship 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 magnitude relationship between the first gain value and the second gain value, and the target gain value is calculated.
Based on this, optionally, in a specific implementation manner, the step S104 may include the following steps 1041 to 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; wherein, the first preset formula is as follows:
wherein, the first and the second end of the pipe are connected with each other,
the target gain value is characterized in that it is,
the first gain value is characterized in that it is,
the second gain value is characterized in that it is,
the present sensitivity is characterized by the presence of,
the first light sensitivity is characterized in that,
characterizing the second sensitivity.
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;
wherein the second predetermined formula is:
step 1043: if the first gain value is equal to the second gain value, the target gain value is calculated by using a first preset formula or a second preset formula.
In this specific implementation manner, when the target gain value is calculated by using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity, first, the target gain value may be calculated by using a corresponding preset formula according to a numerical magnitude 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 can be calculated by using a second preset 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 valueIf the gain is larger than the second gain value, 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 a first predetermined formula or a second predetermined formula.
When the first gain value is equal to the second gain value, if the first predetermined formula is used, the target gain value is calculated as
。
If the second predetermined formula is utilized, the calculated target gain value is
。
Among them, since the sensitivity is usually changed in multiples, for example, sensitivity 100, sensitivity 200, sensitivity 400, sensitivity 800, and the like. Thus, the above
. However, the image capturing apparatus generally performs the division while performing the division calculation, and therefore, the above-mentioned
The calculation result obtained in the image pickup device is 0.
That is, when the first gain value is equal to the second gain value, the first predetermined formula or the second predetermined formula is used to obtain the result
. Therefore, when the first gain value is equal to the second gain value, one formula can be selected from the first preset formula and the second preset formula, and the target gain value can be calculated.
In some cases, to characterizeThe position relationship among the first sensitivity, the second sensitivity and the current sensitivity can be utilized
Characterizing the second sensitivity and using
Characterizing a first sensitivity, wherein,
the characterization is shifted 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 predetermined formula can be expressed as:
wherein the content of the first and second substances,
the second sensitivity is characterized in that,
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 target gain value corresponding to the current sensitivity is calculated, the image acquisition equipment can determine the target gain value corresponding to the current sensitivity of the specified gain item under the current environment brightness, so that the target gain value can be used for shooting the image to be shot to obtain the target image.
Alternatively, the above-mentioned 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 picture brightness.
For example, after the target gain value corresponding to the current sensitivity of the gain item for the red-blue gain under the current ambient brightness is obtained through calculation, the gain item for the red-blue gain can be gained when the image to be shot is shot by the image acquisition equipment, so that the image quality of the target image of the image to be shot is improved, and the image presentation effect of the obtained 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-blue gain and the target gain value corresponding to the current sensitivity of the gain item for the color saturation under the current ambient brightness are obtained through calculation, when the image to be photographed is photographed by the image acquisition device, the gain item for the red-blue gain and the gain item for the color saturation can be gained, so that the image quality of the target image of the image to be photographed is improved, and the image presentation effect of the obtained target image is close to the real scene.
For another example, after obtaining, through calculation, a target gain value corresponding to the current sensitivity of the gain item for the red-blue gain, a target gain value corresponding to the current sensitivity of the gain item for the color saturation, and a target gain value corresponding to the current sensitivity of the gain item for the picture brightness under the current ambient brightness, when the image to be shot is shot by the image acquisition device, the gain item for the red-blue gain, the gain item for the color saturation, and the gain item for the picture brightness are gained, so that the image quality of the target image of the image to be shot is improved, and the picture presentation effect of the obtained target image is close to a real scene.
To facilitate understanding of an image processing method provided in the embodiment of the present application, as shown in fig. 2, a flowchart of a specific embodiment 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 (light sensitivity) and an environment brightness value by using an AE module;
s202: acquiring the interval of the linkage array where the 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 a linkage parameter value under the current ISO;
s204: and performing compensation setting.
Step S201 is to acquire the current ambient brightness and the current sensor gain by using information of an AE module installed in the image acquisition device according to the embodiment of the present application; step S202 is selecting, in the correspondence relationship according to the embodiment of the present application, 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; step S203 is to calculate a target gain value by using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the current sensitivity according to the embodiment of the present application; step S204 is to shoot the image to be shot according to the target gain value in the embodiment of the present application.
When capturing an image to be shot, the image acquisition equipment can acquire the current ISO and an environment brightness value by using information of an installed AE module, and then can acquire a linkage array consisting of a gain value which is larger than the current ISO and has the minimum difference with the current ISO and a gain value which is smaller than the current ISO and has the minimum difference with the current ISO based on the current ISO, so that a linkage parameter value under the current ISO is obtained through linear interpolation according to the current ISO and the acquired linkage array, and then the image acquisition equipment can shoot the image to be shot according to the obtained linkage parameter value, further, the image quality of a target image of the image to be shot is improved, and the image presenting effect of the target image is close to a real scene.
As can be seen from the above, according to the scheme provided by the embodiment of the present application, since the corresponding relationship between the sensitivity and the gain value of different gain items is different under different ambient luminances, the corresponding relationship between the sensitivity and the gain value of a given gain item under different ambient luminances can be set in the image capturing apparatus in advance. In this way, when the image to be captured is captured by the image capture device, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image capture device may determine the current sensitivity of the image to be captured based on the current sensor gain. If there is no target gain value corresponding to the current sensitivity in the correspondence 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 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 may be selected from the correspondence. Then, a target gain value corresponding to the current sensitivity is calculated by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity. Therefore, the image acquisition equipment can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, with the scheme provided by the embodiment of the present application, after determining the current ambient brightness and the current sensitivity of the image to be captured, when there is no corresponding relationship corresponding to the current sensitivity in the corresponding relationship between the sensitivity and the gain value of the specified gain item under the current ambient brightness, the image capturing device may select, among the corresponding relationships, 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. Therefore, the target gain value used when the image to be shot is shot can be calculated 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 improved, and the picture presenting 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, and the device is applied to 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 current ambient brightness and current sensor gain when an image to be captured is captured by the image capturing device;
a sensitivity determination module 320 for determining a current sensitivity based on the current sensor gain;
a parameter selecting module 330, configured to select, if there is no target gain value corresponding to the current sensitivity in a correspondence between sensitivity and gain values of a given 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 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, in the correspondence;
a gain value calculating module 340 for 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 an image obtaining module 350, 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, with the application of the solution provided in the embodiment of the present application, since the corresponding relationship between the sensitivity and the gain value of different gain items is different under different ambient brightness, the corresponding relationship between the sensitivity and the gain value of the specified gain item under different ambient brightness may be set in the image capturing apparatus in advance. In this way, when the image pickup apparatus captures an image to be captured, first, the current ambient brightness and the current sensor gain may be determined, and thus, the image pickup apparatus may determine the current sensitivity of the image to be captured based on the current sensor gain. If there is no target gain value corresponding to the current sensitivity in the correspondence 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 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 may be selected from the correspondence. Then, a target gain value corresponding to the current sensitivity is calculated by using the first sensitivity, the first gain value, the second sensitivity, the second gain value and the current sensitivity. Therefore, the image acquisition equipment can shoot the image to be shot according to the target gain value to obtain a target image.
Based on this, with the solution provided by the embodiment of the present application, when there is no corresponding relationship corresponding to the current sensitivity in the corresponding relationship between the sensitivity and the gain value of the specified gain item under the current ambient brightness after determining the current ambient brightness and the current sensitivity of the image to be captured, the image capturing apparatus may select, among the corresponding relationships, 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. Therefore, the target gain value utilized when the image to be shot is shot can be calculated 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 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: a current analog gain value of the sensor and/or a 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 device further comprises:
an ISP gain value determination module to determine a current ISP gain value for the image capture device before determining a 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 the specified amplification coefficient 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; wherein the first preset formula is as follows:
wherein, the
Characterizing the target gain value, the
Characterizing the first gain value, said
Characterizing the second gain value, said
Characterizing the current sensitivity, the
Characterizing the first sensitivity, the
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 by the embodiment of the present application, an electronic device is further provided by the embodiment of the present application, as shown in fig. 4, and includes 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 mutual communication through the communication bus 404,
a memory 403 for storing a computer program;
the processor 401 is configured to implement the steps of any image processing method provided in the embodiments of the present application when executing the program stored in the memory 403.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a 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 processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
In another embodiment provided by the present application, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of any one of the image processing methods described above.
In yet another embodiment provided by the present application, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the image processing methods of the above embodiments.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it 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. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the 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)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the image capture device embodiment, the apparatus embodiment, the computer-readable storage medium embodiment, and the computer program product embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and in relation to the description, reference may be made to some of the description of the method embodiment.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. An image processing method is applied to an image acquisition device, and comprises the following steps:
when an image to be shot is captured by the image acquisition equipment, determining the current ambient brightness and the current sensor gain;
determining a current sensitivity based on the current sensor gain;
if the corresponding relation of the sensitivity and the gain value of the specified gain item under the current environment brightness does not have a target gain value corresponding to the current sensitivity, selecting a first gain value which is larger than the current sensitivity and corresponds to a first sensitivity with the minimum difference value of the current sensitivity and a second gain value which is smaller than the current sensitivity and corresponds to a second sensitivity with the minimum difference value of the current sensitivity in 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: a current analog gain value of a sensor and/or a 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;
prior to the determining a current sensitivity based on the current sensor gain, the method further comprises:
determining a current ISP gain value of the image acquisition equipment;
the determining a current sensitivity based on the current sensor gain comprises:
and calculating the product of the current analog gain value, the current digital gain value, the current ISP gain value and the specified amplification coefficient as the current sensitivity.
4. The method according to claim 1, wherein said calculating the target gain value using the first sensitivity, the first gain value, the second sensitivity, the second gain value, and the 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; wherein the first preset formula is as follows:
wherein, the
Characterizing the target gain value, the
Characterizing the first gain value, the
Characterizing the second gain value, the
Characterizing the current sensitivity, the
Characterizing the first sensitivity, the
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 as follows:
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, applied to an image acquisition device, the apparatus comprising:
the parameter determining module is used for determining the current ambient brightness and the current sensor gain when the image acquisition equipment captures an image to be shot;
a sensitivity determination module to determine a current sensitivity based on the current sensor gain;
a parameter selection module, configured to select, if there is no target gain value corresponding to the current sensitivity in a correspondence relationship between sensitivity and gain values of a specified 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 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, in the correspondence relationship;
a gain value calculation module for 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 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: a current analog gain value of the sensor and/or a 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 device further comprises:
an ISP gain value determination module for determining a current ISP gain value of the image capture device before determining a current sensitivity based on the current sensor gain;
the sensitivity determination module 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 the specified amplification coefficient 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; wherein the first preset formula is as follows:
wherein, the
Characterizing the target gain value, the
Characterizing the first gain value, the
Characterizing the second gain value, said
Characterizing the current sensitivity, the
Characterizing said firstA sensitivity of
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 as follows:
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 and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any of claims 1 to 4 when executing a program stored in the memory.
10. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1 to 4.
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