WO2024092426A1

WO2024092426A1 - White-balance gain compensation method and apparatus, and electronic device

Info

Publication number: WO2024092426A1
Application number: PCT/CN2022/128695
Authority: WO
Inventors: 何波
Original assignee: 北京小米移动软件有限公司
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2024-05-10

Abstract

The embodiments of the present disclosure relate to the technical field of image processing. Disclosed are a white-balance gain compensation method and apparatus, and an electronic device. The method comprises: acquiring a first color temperature value of an environment of when a camera is started, and a second color temperature value during a historical use process of the camera; determining a white-balance gain compensation value according to the difference between the first color temperature value and the second color temperature value, and/or a preset relationship table between color temperature values and gain values; and performing white-balance gain compensation on a collected image on the basis of the white-balance gain compensation value. In the method, the white-balance gain compensation value, which is adapted to the collected image, can be dynamically calculated on the basis of the first color temperature value, which is acquired when the camera is started, and the second color temperature value, which is acquired during the historical use process, and then white-balance gain compensation is performed on the collected image on the basis of the white-balance gain compensation value, such that the accuracy of white-balance gain compensation when the camera is initially woken up is improved, the problem whereby color casts may occur when the camera is started is avoided, and the user experience is also improved.

Description

A white balance gain compensation method, device and electronic equipment

Technical Field

The present disclosure relates to the field of image processing technology, and in particular to a white balance gain compensation method, device and electronic equipment.

Background technique

Usually, since the camera sensor's response to a gray object is unequal in the three RGB channels, the pictures taken by the camera may be color cast if displayed directly without processing, so it is usually necessary to compensate the white balance gain of the three RGB channels output by the sensor.

In the related art, a fixed white balance gain is usually set manually to compensate the white balance gain of the original image. However, since the environment when the camera is started may be quite different, the fixed white balance gain may not necessarily match the current environment, which may lead to unreasonable compensated white balance gain, and further cause color cast in the output image, thus affecting the user experience.

Summary of the invention

Embodiments of the present disclosure provide a method, device and electronic device for compensating white balance gain.

In a first aspect, an embodiment of the present disclosure provides a method for compensating a white balance gain, comprising:

Acquire a first color temperature value of the environment when the camera is started and a second color temperature value of the camera during historical use;

Determine a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value, and/or a preset relationship table between color temperature values and gain values;

Based on the white balance gain compensation value, white balance gain compensation is performed on the captured image.

Optionally, determining the white balance gain compensation value includes:

When the difference is greater than a threshold, traverse the relationship table to determine a third color temperature value associated with the first color temperature value, a fourth color temperature value, a first white balance gain group corresponding to the third color temperature value, and a second white balance gain group corresponding to the fourth color temperature value, wherein the white balance gain group includes gain values corresponding to two color channels respectively;

A white balance gain compensation value is determined based on the first color temperature value, the third color temperature value and the corresponding first white balance gain group, and the fourth color temperature value and the corresponding second white balance gain group.

Optionally, after traversing the relationship table, the method further includes:

When there is only one color temperature value associated with the first color temperature value in the relationship table, the white balance gain corresponding to the color temperature value is determined as the white balance gain compensation value.

Optionally, determining the white balance gain compensation value includes:

When the difference is less than or equal to a threshold, the white balance gain corresponding to the second color temperature value is determined as a white balance gain compensation value.

Optionally, determining the white balance gain compensation value includes:

When the second color temperature value is empty, a white balance gain compensation value is determined based on a preset relationship table between color temperature values and gain values.

Optionally, the obtaining of a first color temperature value of an environment when the camera is started and a second color temperature value during the historical use of the camera includes:

In the case that there are multiple historical color temperature values, an average value of the multiple historical color temperature values is determined as the second color temperature value.

Optionally, the performing white balance gain compensation on the captured image based on the white balance gain compensation value includes:

A result of multiplying the first gain value of each color channel in the white balance gain compensation value by the second gain value of the same color channel in the acquired image is determined as the white balance gain value of the corresponding color channel of the acquired image.

In a second aspect, an embodiment of the present disclosure provides a white balance gain compensation device, including:

An acquisition module, used to acquire a first color temperature value of the environment when the camera is started and a second color temperature value of the camera during historical use;

A determination module, configured to determine a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value, and/or a preset relationship table between color temperature values and gain values;

The compensation module is used to compensate the white balance gain of the captured image based on the white balance gain compensation value.

Optionally, the determining module is specifically used to:

Optionally, the determining module is further specifically configured to:

Optionally, the acquisition module is specifically used to:

In the case where there are multiple historical color temperature values, an average value of the multiple historical color temperature values is determined as the second color temperature value.

Optionally, the compensation module is specifically used to:

In a third aspect, an embodiment of the present disclosure provides an electronic device, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to call and execute the executable instructions stored in the memory to implement the white balance gain compensation method proposed in the embodiment of the first aspect of the present disclosure.

In a fourth aspect, an embodiment of the present disclosure provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device can execute the white balance gain compensation method proposed in the embodiment of the first aspect of the present disclosure.

In a fifth aspect, an embodiment of the present disclosure provides a computer program product. When the computer program is executed by a processor of an electronic device, the electronic device can execute the white balance gain compensation method proposed in the embodiment of the first aspect of the present disclosure.

The white balance gain compensation method, device, electronic device and storage medium provided by the present disclosure can first obtain the first color temperature value of the environment when the camera is started and the second color temperature value during the historical use of the camera, and then determine the white balance gain compensation value based on the difference between the first color temperature value and the second color temperature value, and/or the relationship table between the preset color temperature value and the gain value, and then compensate the white balance gain of the captured image based on the white balance gain compensation value. Therefore, the white balance gain compensation value adapted to the captured image can be dynamically calculated based on the first color temperature value obtained when the camera is started and the second color temperature value during the historical use, and then the white balance gain of the captured image is compensated based on the white balance gain compensation value, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially awakened, avoiding the color cast problem that may occur when the camera is started, and effectively improving the user's camera experience.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

FIG1 is a flow chart of a method for compensating a white balance gain according to an embodiment of the present disclosure;

FIG2 is a flow chart of a method for compensating a white balance gain according to an embodiment of the present disclosure;

FIG2A is a schematic diagram of a compensation scenario of a white balance gain according to an embodiment of the present disclosure;

FIG2B is a schematic diagram of a white balance gain compensation process according to an embodiment of the present disclosure;

FIG3 is a schematic structural diagram of a white balance gain compensation device according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

The following describes a method, device, electronic device, and storage medium for compensating white balance gain according to an embodiment of the present disclosure with reference to the accompanying drawings.

The white balance gain compensation method of the embodiment of the present disclosure may be executed by the white balance gain compensation device provided by the embodiment of the present disclosure, and the device may be configured in an electronic device.

FIG1 is a flow chart of a method for compensating a white balance gain provided by an embodiment of the present disclosure.

As shown in FIG1 , the white balance gain compensation method may include the following steps:

Step 101, obtaining a first color temperature value of the environment when the camera is started and a second color temperature value during the historical use of the camera.

The camera may be any electronic device with an image capture function, such as a professional video image capture device, or a mobile phone camera, a tablet camera, or the like, and the present disclosure does not limit this.

It is understandable that, since the response of the camera sensor to the object is usually unequal in the three channels of RGB, the picture taken by the camera may be color-biased if it is displayed directly without being processed. Therefore, in the embodiment of the present disclosure, the first color temperature value of the current environment can be obtained when the camera is started, wherein the startup of the camera can also be understood as the state when the camera is initially awakened, etc., which is not limited in the present disclosure.

In addition, since the color temperature sensor spectrasensor can be used to detect the ambient light source and output the correlated color temperature (CCT) value of the current environment, etc. Therefore, in the embodiment of the present disclosure, the first color temperature value of the environment when the camera is started can be obtained through the color temperature sensor.

The color temperature sensor may be disposed in the camera, and may be any type of color temperature sensor, which is not limited in the present disclosure.

Optionally, a storage unit may be provided to store the second color temperature value during the history of the camera use. Thus, in the embodiment of the present disclosure, when the camera is started, a search may be performed in the storage unit to obtain the stored second color temperature value, etc., which is not limited in the present disclosure.

It is understandable that the second color temperature value during the historical use of the camera can be understood as the color temperature value when the camera was last exited, or can also be understood as the color temperature values of the most recent period of time, etc. Therefore, the second color temperature value during the historical use of the camera may be one, or may be multiple, or may be empty, etc., and the present disclosure does not limit this.

Step 102: determining a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value and/or a preset relationship table between color temperature values and gain values.

Among them, a threshold value can be set in advance. After obtaining the first color temperature value and the second color temperature value, the difference between the first color temperature value and the second color temperature value can be determined first, and then the difference is compared with the threshold value. According to the relationship between the two, a corresponding method is adopted to determine the white balance gain compensation value.

Optionally, when the difference between the first color temperature value and the second color temperature value is less than or equal to a threshold value, the white balance gain corresponding to the second color temperature value may be determined as the white balance gain compensation value.

It can be understood that if the difference between the first color temperature value and the second color temperature value is less than the threshold value, then it can be considered that the ambient color temperature value when the camera is started is slightly different from the ambient color temperature value during the historical use of the camera. At this time, in order to reduce the amount of data processing, the white balance gain corresponding to the second color temperature value can be determined as the white balance gain compensation value.

For example, when the threshold is 500 Kelvin (K), if the difference between the current first color temperature value and the second color temperature value is 150K, which is less than the threshold 500K, then the white balance gain corresponding to the second color temperature value can be determined as the white balance gain compensation value, etc. The present disclosure does not limit this.

Optionally, when storing the second color temperature value during the historical use of the camera, the white balance gain corresponding to the second color temperature value may be stored in association with it, and the present disclosure does not limit this.

Optionally, when the second color temperature value in the history of camera use is empty, the white balance gain compensation value can be determined based on a preset relationship table between color temperature values and gain values.

For example, the white balance gain compensation value corresponding to the first color temperature value can be directly obtained based on the preset relationship table between the color temperature value and the gain value; or, the white balance gains corresponding to the remaining color temperature values associated with the first color temperature value can be obtained based on the relationship table, and processed to obtain the corresponding white balance gain compensation value, etc. The present disclosure does not limit this.

Step 103: Compensate the white balance gain of the captured image based on the white balance gain compensation value.

Among them, the captured image may be the original raw image captured by the camera. If it is displayed directly without being processed, problems such as color cast may occur. Therefore, in the embodiment of the present disclosure, when capturing an image, the first color temperature value of the environment can be obtained when the camera is started, and based on the first color temperature value, a white balance gain compensation value suitable for the captured image is dynamically calculated. Thereafter, based on the white balance gain compensation value, the white balance gain of the captured image is compensated, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially woken up, avoiding the color cast problem that may occur when the camera is started as much as possible, and effectively improving the user's camera experience.

It can be understood that after the white balance gain compensation value is determined, the white balance gain compensation value can be multiplied by the gain value corresponding to the captured image, and the result is the white balance gain value corresponding to the image, thereby achieving white balance gain compensation for the captured image, etc. The present disclosure does not limit this.

In the disclosed embodiment, the first color temperature value of the environment when the camera is started and the second color temperature value during the historical use of the camera can be first obtained, and then the white balance gain compensation value can be determined according to the difference between the first color temperature value and the second color temperature value and/or the relationship table between the preset color temperature value and the gain value, and then the white balance gain compensation can be performed on the captured image based on the white balance gain compensation value. Thus, the white balance gain compensation value adapted to the captured image can be dynamically calculated based on the first color temperature value obtained when the camera is started and the second color temperature value during the historical use, and then the white balance gain compensation can be performed on the captured image based on the white balance gain compensation value, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially awakened, avoiding the color cast problem that may occur when the camera is started as much as possible, and effectively improving the user's camera experience.

FIG2 is a flow chart of a method for compensating a white balance gain provided by an embodiment of the present disclosure. As shown in FIG2 , the method for compensating a white balance gain may include the following steps:

Step 201, obtaining a first color temperature value of the environment when the camera is started and a second color temperature value during the camera's historical use. Optionally, if there are multiple historical color temperature values, the average value of the multiple historical color temperature values can be determined as the second color temperature value.

Among them, the historical color temperature value may refer to the color temperature value of the camera during all uses from the first use to the current moment; or, it may also refer to the color temperature value when used within a preset period before the current use, etc., which is not limited in the present disclosure.

For example, if the multiple historical color temperature values are 4000K, 4500K, and 4100K, respectively, then the average value of the multiple historical color temperature values, 4200K, may be determined as the second color temperature value.

It should be noted that the above examples are merely illustrative and cannot be used as limitations on the number and corresponding values of historical color temperature values in the embodiments of the present disclosure.

Step 202, when the difference between the first color temperature value and the second color temperature value is greater than a threshold value, traverse a preset color temperature value and gain value relationship table to determine a third color temperature value associated with the first color temperature value, a fourth color temperature value, a first white balance gain group corresponding to the third color temperature value, and a second white balance gain group corresponding to the fourth color temperature value.

The white balance gain group may include gain values corresponding to any two color channels, for example, the gain values corresponding to the R channel and the G channel, or the gain values corresponding to the G channel and the B channel, or the gain values corresponding to the R channel and the B channel, etc., which are not limited in the present disclosure.

The threshold value may be a pre-set value, such as 100K, 600K, 880K, etc., which is not limited in the present disclosure.

In addition, in the relationship table between color temperature values and gain values, color temperature values close to the first color temperature value may be determined as the third color temperature value and the fourth color temperature value associated with the first color temperature value.

Among them, the color temperature value associated with the first color temperature value can be understood as a color temperature value that is close to the first color temperature value. For example, the color temperature value that is closest to the first color temperature value and greater than the first color temperature value can be determined as the third color temperature value; the color temperature value that is closest to the first color temperature value and less than the first color temperature value can be determined as the fourth color temperature value. Alternatively, the color temperature value that is closest to the first color temperature value and greater than the first color temperature value can be determined as the fourth color temperature value; the color temperature value that is closest to the first color temperature value and less than the first color temperature value can be determined as the third color temperature value, and so on. The present disclosure does not limit this.

It is understandable that experiments on color temperature values and gain values can be conducted under standard light sources to obtain a preset relationship table between color temperature values and gain values. Alternatively, the preset relationship table between color temperature values and gain values can be determined in any other desirable manner, and the present disclosure does not limit this.

For example, in a preset relationship table between color temperature values and gain values, such as that shown in Table 1 below, the relationship table can be traversed based on the first color temperature value to determine a third color temperature value associated with the first color temperature value, a fourth color temperature value, a first white balance gain group corresponding to the third color temperature value, and a second white balance gain group corresponding to the fourth color temperature value.

Table 1

标准光源Standard light source	CCT/KCCT/K	白平衡增益WB gainWhite balance gain WB gain
D75D75	75007500	R_gain:3.15,B_gain:0.75R_gain:3.15,B_gain:0.75
D65D65	65006500	R_gain:2.85,B_gain:0.96R_gain:2.85,B_gain:0.96
D50D50	50005000	R_gain:2.26,B_gain:1.35R_gain:2.26,B_gain:1.35
TL84TL84	38503850	R_gain:1.89,B_gain:1.67R_gain:1.89,B_gain:1.67
AA	28502850	R_gain:1.32,B_gain:1.99R_gain:1.32,B_gain:1.99
HH	23002300	R_gain:1.14,B_gain:2.17R_gain:1.14,B_gain:2.17

For example, when the threshold is 500K, if the first color temperature value is 6000K and the second color temperature value is 5300K, the difference between the two is 700K, which is greater than the threshold 500K, then the relationship table between the color temperature value and the gain value can be traversed based on the first color temperature value 6000K. It can then be determined that the third color temperature value associated with the first color temperature value can be: 6500K, and the corresponding gain values of the two color channels included in the first white balance gain group are: the gain value R_gain of the R channel is 2.85, and the gain value B_gain of the B channel is 0.96. The fourth color temperature value associated with the first color temperature value can be: 5000K, and the corresponding gain values of the two color channels included in the second white balance gain group are: R_gain is 2.26, B_gain is 1.35, etc., and the present disclosure does not limit this.

It is understandable that each element and each corresponding relationship in Table 1 exist independently; these elements and corresponding relationships are exemplarily listed in the same table, but it does not mean that all elements and corresponding relationships in the table must exist at the same time as shown in Table 1. The value of each element and each corresponding relationship is independent of any other element value or corresponding relationship in Table 1. Therefore, those skilled in the art can understand that the value of each element and each corresponding relationship in Table 1 are all independent embodiments.

It should be noted that the above Table 1 is only a schematic illustration. In actual use, the gain values corresponding to any two color channels can be set, such as R channel and G channel, G channel and B channel, etc., and the present disclosure does not limit this.

Step 203: determining a white balance gain compensation value based on the first color temperature value, the third color temperature value and the corresponding first white balance gain group, and the fourth color temperature value and the corresponding second white balance gain group.

Optionally, after determining the first color temperature value, the third color temperature value and the corresponding first white balance gain group, the fourth color temperature value and the corresponding second white balance gain group, the white balance gain compensation value can be determined based on the first color temperature value in combination with the following formula (1).

Wherein, gain_new represents the white balance gain compensation value, CCT_sensor represents the first color temperature value, D75_WBgain represents the white balance gain group corresponding to the standard light source D75 with a CCT of 7500K, D65_WBgain represents the white balance gain group corresponding to the standard light source D65 with a CCT of 6500K, D50_WBgain represents the white balance gain group corresponding to the standard light source D50 with a CCT of 5000K, TL84_WBgain represents the white balance gain group corresponding to the standard light source TL84 with a CCT of 3850K, A_WBgain represents the white balance gain group corresponding to the standard light source A with a CCT of 2850K, and H_WBgain represents the white balance gain group corresponding to the standard light source A with a CCT of 2300K.

For example, if the first color temperature value is 6000K, by traversing the relationship table between the color temperature value and the gain value, it is determined that the gain values of the first white balance gain group corresponding to the third color temperature value of 6500K are: R_gain is 2.85, B_gain is 0.96; the gain values of the second white balance gain group corresponding to the fourth color temperature value of 5000K are: R_gain is 2.26, B_gain is 1.35.

Then you can use the formula:

Calculates white balance gain compensation value.

Therefore, it can be determined that the white balance gain compensation value gain_new _R of the R channel can be:

The white balance gain compensation value gain_new _G of the G channel can be:

It should be noted that the above examples are merely illustrative and cannot be used as limitations on the method of determining the white balance gain compensation value in the embodiments of the present disclosure.

It is understandable that in the preset table of relationships between color temperature values and gain values, there may be multiple color temperature values associated with the first color temperature value, or there may be only one color temperature value, and the present disclosure does not limit this.

Optionally, in a preset relationship table between color temperature values and gain values, when there is only one color temperature value associated with the first color temperature value, the white balance gain corresponding to the color temperature value is determined as the white balance gain compensation value.

It is understandable that when the first color temperature value exceeds the color temperature value range in the preset color temperature value and gain value relationship table, it can be considered that the color temperature value associated with the first color temperature value at this time is the corresponding boundary value. For example, if the first color temperature value exceeds the maximum color temperature value in the relationship table, then the maximum color temperature value can be considered to be the color temperature value associated with the first color temperature value. Or, if the first color temperature value exceeds the minimum color temperature value in the relationship table, then the minimum color temperature value can be considered to be the color temperature value associated with the first color temperature value, and so on. The present disclosure does not limit this.

For example, if the first color temperature value is 8000K, and the maximum color temperature value in the preset color temperature value and gain value relationship table is 7500K and the minimum color temperature value is 2300K, it can be determined that it has exceeded the color temperature value range in the relationship table, and then it can be determined that there is only one color temperature value associated with the first color temperature value, that is, 7500K. Then, the white balance gain corresponding to "7500K": R_gain is 3.15, B_gain is 0.75, which can be determined as the white balance gain compensation value.

Alternatively, if the first color temperature value is 2000K, the maximum color temperature value in the preset color temperature value and gain value relationship table is 7500K and the minimum color temperature value is 2300K, which can be determined to have exceeded the color temperature value range in the relationship table, and then it can be determined that there is only one color temperature value associated with the first color temperature value, that is, 2300K. Then, the white balance gain corresponding to "2300K": R_gain is 1.14, B_gain is 2.17, which can be determined as the white balance gain compensation value.

Step 204: When the difference between the first color temperature value and the second color temperature value is less than or equal to a threshold, a white balance gain corresponding to the second color temperature value is determined as a white balance gain compensation value.

Step 205 , when the second color temperature value is empty, determine the white balance gain compensation value based on a preset relationship table between color temperature values and gain values.

It is understandable that if the second color temperature value is not obtained, that is, the second color temperature value is empty, then the preset color temperature value and gain value relationship table can be traversed based on the first color temperature value to determine the third color temperature value associated with the first color temperature value, the fourth color temperature value, the first white balance gain group corresponding to the third color temperature value, and the second white balance gain group corresponding to the fourth color temperature value, wherein the white balance gain group contains gain values corresponding to two color channels respectively. Then, the white balance gain compensation value is determined based on the first color temperature value, the third color temperature value and the corresponding first white balance gain group, the fourth color temperature value and the corresponding second white balance gain group.

For example, if the relationship table between the preset color temperature value and the gain value is shown in Table 1, then based on the first color temperature value, the relationship table can be traversed to determine the first white balance gain group corresponding to the third color temperature value associated with the first color temperature value and the second white balance gain group corresponding to the fourth color temperature value, and perform linear difference, and combine with formula (1) to determine the white balance gain compensation value. The specific content and implementation method can refer to the description of "Determining the white balance gain compensation value" in step 203 and step 204, which will not be repeated here.

Optionally, when the second color temperature value is empty, if based on the first color temperature value, after traversing the preset color temperature value and gain value relationship table, it is determined that there is only one color temperature value in the relationship table that is associated with the first color temperature value, then at this time the white balance gain corresponding to the color temperature value can be determined as the white balance gain compensation value, etc. The present disclosure does not limit this.

Step 206: Compensate the white balance gain of the captured image based on the white balance gain compensation value.

Optionally, a result of multiplying a first gain value of each color channel in the white balance gain compensation value by a second gain value of the same color channel in the captured image may be determined as the white balance gain value of the corresponding color channel of the captured image.

For example, if the first gain value of the R color channel in the white balance gain compensation value is: 2.65, the first gain value of the B color channel in the white balance gain compensation value is: 1.09, the second gain value of the R color channel in the captured image is: a, and the second gain value of the B color channel in the captured image is: b, then after performing white balance gain compensation on the captured image using the white balance gain compensation value, it can be determined that the white balance gain value of the R color channel of the captured image is: 2.65*a, the white balance gain value of the B color channel is: 1.09*b, and so on. The present disclosure is not limited to this.

It should be noted that the white balance gain compensation method provided in the present disclosure can be applied to any scenario involving white balance gain compensation.

For example, in any scenario where a camera is used to capture images, the camera and the sensor may be used to output the captured original image and the first color temperature value of the environment when the camera is started.

In addition, the storage and processing unit may store the second color temperature value during the camera's historical startup process and a relationship table between the preset color temperature value and the gain value. After processing by the storage and processing unit, a white balance gain compensation value may be determined, and then the original image may be compensated for the white balance gain based on the white balance gain compensation value. The storage and processing unit may then output an image that has been compensated for the white balance gain, and then the image may be displayed on a display terminal. For example, for a mobile phone camera, it may be displayed in the "Album" of the mobile phone for the user to view, etc. The present disclosure does not limit this.

The compensation process of the white balance gain provided by the present disclosure is described below in conjunction with FIG. 2B .

First, when the camera is started, the color temperature sensor can be awakened to obtain the first color temperature value of the current environment and the second color temperature value of the camera during historical use. The second color temperature value of the camera during historical use can be obtained by checking whether the storage unit stores the second color temperature value of the camera during historical use and the corresponding historical white balance gain value. For example, it can be checked whether the storage unit stores the second color temperature value and the corresponding historical white balance gain when the camera was last exited.

In the case where the second color temperature value is stored in the storage unit, the difference between the first color temperature value and the second color temperature value can be calculated, and then the relationship between the difference and the threshold can be further determined. In the case where the difference is greater than the threshold, the white balance gain compensation value can be determined based on the first color temperature value, the relationship table of the preset color temperature value and the gain value, and then the white balance gain of the captured image can be compensated based on the white balance gain compensation value. In the case where the difference is less than or equal to the threshold, the historical white balance gain corresponding to the second color temperature value can be used to compensate the white balance gain of the captured image.

When the second color temperature value is not stored in the storage unit, a white balance gain compensation value can be determined based on the first color temperature value, a preset color temperature value and a gain value relationship table, and then the white balance gain of the captured image is compensated based on the white balance gain compensation value.

It should be noted that the above examples are merely illustrative and cannot be used as a limitation on the compensation process of the white balance gain in the embodiments of the present disclosure.

In the disclosed embodiment, a first color temperature value of the environment when the camera is started and a second color temperature value during the historical use of the camera may be first obtained. Then, when the difference between the first color temperature value and the second color temperature value is greater than a threshold, a preset color temperature value and gain value relationship table may be traversed to determine a third color temperature value associated with the first color temperature value, a fourth color temperature value, a first white balance gain group corresponding to the third color temperature value, and a second white balance gain group corresponding to the fourth color temperature value, wherein the white balance gain group includes gain values corresponding to two color channels respectively. Then, a white balance gain compensation value may be determined based on the first color temperature value, the third color temperature value and the corresponding first white balance gain group, and the fourth color temperature value and the corresponding second white balance gain group. When the difference between the first color temperature value and the second color temperature value is less than or equal to the threshold, the white balance gain corresponding to the second color temperature value may be determined as the white balance gain compensation value. When the second color temperature value is empty, a white balance gain compensation value may be determined based on the preset color temperature value and gain value relationship table. Then, based on the white balance gain compensation value, white balance gain compensation may be performed on the captured image. Therefore, based on the first color temperature value obtained when the camera is started and the second color temperature value during historical use, the white balance gain compensation value suitable for the captured image can be dynamically calculated, and then the white balance gain compensation is performed on the captured image, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially woken up, avoiding the color cast problem that may occur when the camera is started as much as possible, and effectively improving the user's camera experience.

The embodiment of the present disclosure further proposes a compensation device for white balance gain. FIG3 is a schematic structural diagram of the compensation device for white balance gain according to the embodiment of the present disclosure.

As shown in FIG. 3 , the white balance gain compensation device 300 includes: an acquisition module 310 , a determination module 320 , and a compensation module 330 .

The acquisition module 310 is used to acquire a first color temperature value of the environment when the camera is started and a second color temperature value during the historical use of the camera.

The determination module 320 is used to determine a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value and/or a preset relationship table between color temperature values and gain values.

The compensation module 330 is used to compensate the white balance gain of the captured image based on the white balance gain compensation value.

Optionally, the determining module 320 is specifically configured to:

Optionally, the determining module 320 is further specifically configured to:

Optionally, the acquisition module 310 is specifically configured to:

Optionally, the compensation module 330 is specifically used to:

The functions and specific implementation principles of the above modules in the embodiments of the present disclosure can be referred to the above method embodiments, and will not be repeated here.

The white balance gain compensation device of the embodiment of the present disclosure can first obtain the first color temperature value of the environment when the camera is started and the second color temperature value during the historical use of the camera, and then determine the white balance gain compensation value based on the difference between the first color temperature value and the second color temperature value, and/or the relationship table between the preset color temperature value and the gain value, and then compensate the white balance gain of the captured image based on the white balance gain compensation value. Therefore, the white balance gain compensation value adapted to the captured image can be dynamically calculated based on the first color temperature value obtained when the camera is started and the second color temperature value during the historical use, and then the white balance gain of the captured image can be compensated based on the white balance gain compensation value, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially awakened, avoiding the color cast problem that may occur when the camera is started, and effectively improving the user's camera experience. Figure 4 is a structural block diagram of an electronic device according to an embodiment of the present disclosure.

As shown in FIG. 4 , the electronic device 200 includes: a memory 210 and a processor 220 , and a bus 230 connecting different components (including the memory 210 and the processor 220 ).

The memory 210 is used to store executable instructions of the processor 220 ; the processor 201 is configured to call and execute the executable instructions stored in the memory 202 to implement the white balance gain compensation method proposed in the above embodiment of the present disclosure.

Bus 230 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

The electronic device 200 typically includes a variety of electronic device readable media. These media can be any available media that can be accessed by the electronic device 200, including volatile and non-volatile media, removable and non-removable media.

The memory 210 may also include computer system readable media in the form of volatile memory, such as random access memory (RAM) 240 and/or cache memory 250. The electronic device 200 may further include other removable/non-removable, volatile/non-volatile computer system storage media. By way of example only, the storage system 260 may be used to read and write non-removable, non-volatile magnetic media (not shown in FIG. 4 , commonly referred to as a “hard drive”). Although not shown in FIG. 4 , a disk drive for reading and writing a removable non-volatile disk (such as a “floppy disk”) and an optical disk drive for reading and writing a removable non-volatile optical disk (such as a CD-ROM, DVD-ROM or other optical media) may be provided. In these cases, each drive may be connected to the bus 230 via one or more data medium interfaces. The memory 210 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present disclosure.

A program/utility 280 having a set (at least one) of program modules 270 may be stored, for example, in the memory 210, such program modules 270 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 270 generally perform the functions and/or methods of the embodiments described in the present disclosure.

The electronic device 200 may also communicate with one or more external devices 290 (e.g., keyboard, pointing device, display 291, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 200, and/or communicate with any device that enables the electronic device 200 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed via an input/output (I/O) interface 292. Furthermore, the electronic device 200 may also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN) and/or public network, such as the Internet) via a network adapter 293. As shown, the network adapter 293 communicates with other modules of the electronic device 200 via a bus 230. It should be understood that, although not shown in the figure, other hardware and/or software modules may be used in conjunction with the electronic device 200, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

The processor 220 executes various functional applications and data processing by running the programs stored in the memory 210 .

It should be noted that the implementation process of the electronic device of the embodiment of the present disclosure refers to the aforementioned explanation of the white balance gain compensation method of the embodiment of the present disclosure, which will not be repeated here.

The electronic device of the disclosed embodiment can first obtain the first color temperature value of the environment when the camera is started and the second color temperature value during the historical use of the camera, and then determine the white balance gain compensation value based on the difference between the first color temperature value and the second color temperature value and/or the relationship table between the preset color temperature value and the gain value, and then compensate the white balance gain of the captured image based on the white balance gain compensation value. Therefore, the white balance gain compensation value adapted to the captured image can be dynamically calculated based on the first color temperature value obtained when the camera is started and the second color temperature value during the historical use, and then the white balance gain compensation is performed on the captured image based on the white balance gain compensation value, thereby improving the accuracy of the white balance gain compensation of the camera when it is initially awakened, avoiding the color cast problem that may occur when the camera is started, and effectively improving the user's camera experience.

In order to implement the above embodiment, the embodiment of the present disclosure further proposes a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device can perform the white balance gain compensation method as described above.

In order to implement the above embodiment, the embodiment of the present disclosure further provides a computer program product. When the computer program is executed by a processor of an electronic device, the electronic device can execute the white balance gain compensation method as described above.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, the process or function described in the embodiment of the present disclosure is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can 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 program can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. 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 or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

Those skilled in the art can understand that the various numerical numbers such as first and second involved in the present disclosure are only used for the convenience of description and are not used to limit the scope of the embodiments of the present disclosure, but also indicate the order of precedence.

At least one in the present disclosure may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present disclosure. In the embodiments of the present disclosure, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no order of precedence or size between the technical features described by the "first", "second", "third", "A", "B", "C" and "D".

The corresponding relationships shown in the tables in the present disclosure can be configured or predefined. The values of the information in each table are only examples and can be configured as other values, which are not limited by the present disclosure. When configuring the corresponding relationship between the information and each parameter, it is not necessarily required to configure all the corresponding relationships illustrated in each table. For example, in the table in the present disclosure, the corresponding relationships shown in some rows may not be configured. For another example, appropriate deformation adjustments can be made based on the above table, such as splitting, merging, etc. The names of the parameters shown in the titles of the above tables can also use other names that can be understood by the communication device, and the values or representations of the parameters can also be other values or representations that can be understood by the communication device. When implementing the above tables, other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables.

The predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this disclosure.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

A white balance gain compensation method, characterized by comprising:

Acquire a first color temperature value of the environment when the camera is started and a second color temperature value of the camera during historical use;

Determine a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value, and/or a preset relationship table between color temperature values and gain values;

Based on the white balance gain compensation value, white balance gain compensation is performed on the captured image.
The method according to claim 1, wherein determining the white balance gain compensation value comprises:

When the difference is greater than a threshold, traverse the relationship table to determine a third color temperature value associated with the first color temperature value, a fourth color temperature value, a first white balance gain group corresponding to the third color temperature value, and a second white balance gain group corresponding to the fourth color temperature value, wherein the white balance gain group includes gain values corresponding to two color channels respectively;

A white balance gain compensation value is determined based on the first color temperature value, the third color temperature value and the corresponding first white balance gain group, and the fourth color temperature value and the corresponding second white balance gain group.
The method according to claim 2, characterized in that after traversing the relationship table, it also includes:

When there is only one color temperature value associated with the first color temperature value in the relationship table, the white balance gain corresponding to the color temperature value is determined as the white balance gain compensation value.
The method according to claim 1, wherein determining the white balance gain compensation value comprises:

When the difference is less than or equal to a threshold, the white balance gain corresponding to the second color temperature value is determined as a white balance gain compensation value.
The method according to claim 1, wherein determining the white balance gain compensation value comprises:

When the second color temperature value is empty, a white balance gain compensation value is determined based on the preset relationship table between color temperature values and gain values.
The method according to claim 1, wherein obtaining a first color temperature value of the environment when the camera is started and a second color temperature value during the historical use of the camera comprises:

In the case that there are multiple historical color temperature values, an average value of the multiple historical color temperature values is determined as the second color temperature value.
The method according to any one of claims 1 to 6, characterized in that the step of compensating the white balance gain of the captured image based on the white balance gain compensation value comprises:

A result of multiplying the first gain value of each color channel in the white balance gain compensation value by the second gain value of the same color channel in the acquired image is determined as the white balance gain value of the corresponding color channel of the acquired image.
A white balance gain compensation device, characterized by comprising:

An acquisition module, used to acquire a first color temperature value of the environment when the camera is started and a second color temperature value of the camera during historical use;

A determination module, configured to determine a white balance gain compensation value according to a difference between the first color temperature value and the second color temperature value, and/or a preset relationship table between color temperature values and gain values;

The compensation module is used to compensate the white balance gain of the captured image based on the white balance gain compensation value.
An electronic device, comprising:

processor;

a memory for storing executable instructions for the processor;

The processor is configured to call and execute the executable instructions stored in the memory to implement the white balance gain compensation method as described in any one of claims 1 to 7.
A non-transitory computer-readable storage medium, when instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the white balance gain compensation method as described in any one of claims 1 to 7.