TWI817610B - White balance coefficient correction method and electronic device - Google Patents

Abstract

The disclosure provides a white balance coefficient correction method and an electronic device. The method includes the following steps. Default white balance coefficients are recorded. An image sensor is used to perform a light sensing operation under the illumination of a light source, so as to obtain a plurality of response values corresponding to a plurality of color channels. Whether the response values corresponding to the color channels satisfy a tolerable condition is determined based on a default condition range of a default color temperature. In response to determining that the response values satisfy the tolerable condition, the default white balance coefficient is corrected according to the response values corresponding to the color channels, so as to obtain a plurality of final white balance coefficients corresponding to the default color temperature.

Description

White balance coefficient correction method and electronic device

The present invention relates to an electronic device, and in particular, to a white balance coefficient correction method and an electronic device.

Currently, most electronic products are equipped with image capture modules, allowing users to operate these electronic products to take photos or videos. In addition to the function of recording images, it can also perform various subsequent applications based on the captured images, such as video conferencing or augmented reality. Due to various assembly factors or differences in component characteristics, there are differences in the sensing results produced by different image capture modules under the same light source environment. That is to say, if the same white balance coefficient is applied to different image sensing modules, the sensing results produced by these image sensing modules under the same light source environment are inconsistent. Therefore, these image sensing modules will undergo a white balance coefficient correction process separately before leaving the factory to obtain exclusive white balance coefficients, rather than simply applying the same white balance coefficient to all image sensing modules.

However, in a calibration environment where the white balance coefficient is corrected, the factory may use multiple light source devices to calibrate multiple image capture modules. However, these light source devices may age as their years of use increase. , and the wavelengths of light emitted by different light source devices under the same color temperature setting conditions are also different. Therefore, the correction result of the white balance coefficient will not be as expected because the color temperature of the light source emitted by the light source device is shifted. In addition, during the correction process of the white balance coefficient, the operator may also set the color temperature of the light source device to an unexpected color temperature due to misoperation, thereby causing the correction result of the white balance coefficient to be obviously wrong. Once the correction result of the white balance coefficient is not ideal, it will cause color cast in the images captured based on the automatic white balance function.

In view of this, the present invention provides a white balance coefficient correction method and an electronic device, which can be used to solve the above technical problems.

Embodiments of the present invention provide a white balance coefficient correction method, which is suitable for electronic devices including image sensors. The method includes the following steps. Record multiple preset white balance coefficients. The image sensor is used to perform a light sensing operation under the illumination of a light source to obtain multiple response values corresponding to multiple color channels. Based on a preset condition range of a preset color temperature, it is determined whether the response value corresponding to the color channel meets a tolerable condition. In response to determining that the response value meets the tolerable condition, the preset white balance coefficient is corrected according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature.

An embodiment of the present invention provides an electronic device, which includes an image sensor, a storage device and a processor. The processor is coupled to the image sensor and the storage device, and is configured to perform the following steps. Record multiple preset white balance coefficients. The image sensor is used to perform a light sensing operation under the illumination of a light source to obtain multiple response values corresponding to multiple color channels. Based on a preset condition range of a preset color temperature, it is determined whether the response value corresponding to the color channel meets a tolerable condition. In response to determining that the response value meets the tolerable condition, the preset white balance coefficient is corrected according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature.

Based on the above, in embodiments of the present invention, multiple response values of multiple color channels can be obtained by performing light sensing operations through the image sensor under the illumination of the light source in the calibration environment. When these response values are judged to meet the tolerable conditions according to the preset condition range corresponding to the preset color temperature, these response values can be used to correct the stored preset white balance coefficients, thereby obtaining the final white balance corresponding to this preset color temperature. Balance factor. In this way, unexpected errors in the correction results of the white balance coefficient can be avoided, thereby improving the reliability of the white balance gain correction.

Some embodiments of the present invention will be described in detail with reference to the accompanying drawings. The component symbols cited in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only part of the present invention and do not disclose all possible implementations of the present invention. Rather, these embodiments are only examples of methods and apparatuses within the scope of the patent application of the present invention.

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. Please refer to FIG. 1 . In different embodiments, the electronic device 100 may be, for example, a laptop computer, a smart TV, a tablet computer, a game console, a mobile phone, or other electronic device with an image capture function. The present invention is not limited thereto. In FIG. 1 , the electronic device 100 may include an image sensor 110 , a storage device 120 , and a processor 130 .

In some embodiments, the image sensor 110 is used to provide image sensing functions. The image sensor 110 may include a photosensitive element, such as a Charge Coupled Device (CCD), a Complementary Metal-Oxide Semiconductor (CMOS) element or other elements, which the present invention is not limited to. The image sensor 110 may be combined with other components (such as a lens, aperture, etc.) to form a camera module of the electronic device 100 .

The storage device 120 can be used to store images, instructions, program codes, software modules, etc., and can be, for example, any type of fixed or removable random access memory (RAM) or read-only memory. (read-only memory, ROM), flash memory, hard disk or other similar devices, integrated circuits and combinations thereof.

The processor 130 is coupled to the image sensor 110 and the storage device 120, such as a central processing unit (CPU), an application processor (AP), or other programmable general or special purposes. Microprocessor (microprocessor), digital signal processor (DSP), image signal processor (ISP), graphics processing unit (GPU) or other similar devices, integrated circuits and combinations thereof.

The processor 130 can access and execute the software module recorded in the storage device 120 to implement the white balance coefficient correction method in the embodiment of the present invention. The software modules described above may be broadly construed to mean instructions, instruction sets, code, code, programs, applications, software packages, threads, programs, functions, etc., whether referred to as software, firmware, middleware or the like. Software, microcode, hardware description language, or others.

FIG. 2 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention. Referring to FIG. 2 , the method of this embodiment can be executed by the electronic device 100 in FIG. 1 . The details of each step in FIG. 2 will be described below with reference to the components shown in FIG. 1 .

In step S202, the storage device 120 records a plurality of preset white balance coefficients. Specifically, the storage device 120 may record a plurality of preset white balance coefficients corresponding to a plurality of preset color temperatures, and the plurality of preset white balance coefficients corresponding to each preset color temperature may include a red-green ratio (R/G) coefficient. And the blue-green (B/G) proportion coefficient. For example, these preset color temperatures may include 6500K for D65 light source, 4150K for CWF light source, and 2800K for A light source, etc., and the present invention is not limited thereto. The processor 130 can write a plurality of preset white balance coefficients of a plurality of preset color temperatures into the storage device 120 , and the plurality of preset white balance coefficients corresponding to the plurality of preset color temperatures can be used to establish a preset color temperature curve. The storage device 120 is, for example, an electronically erasable rewritable read-only memory (EEPROM) connected to an image signal processor (ISP), but the invention is not limited thereto.

In step S204, the processor 130 may use the image sensor 110 to perform a light sensing operation under illumination of a light source to obtain multiple response values corresponding to multiple color channels. Specifically, when the white balance coefficient of the electronic device 100 is to be corrected, the electronic device 100 will be placed in a light box or other correction environment. When the processor 130 performs a white balance coefficient correction operation, the image sensor 110 will perform a light sensing operation by photographing a white correction object in the correction environment. The white calibration object is, for example, a white acrylic plate or white paper, and the present invention is not limited thereto.

It should be noted that when the white balance coefficient is corrected for a certain preset color temperature, the set target color temperature of the light source in the correction environment should be the preset color temperature. In some embodiments, after the image sensor 110 captures a white correction object, the processor 130 may capture multiple response values (ie, pixel values of the image pixels) of multiple color channels of multiple pixels in the image. Perform statistical operations, such as averaging the response values of each color channel or other statistical operations, etc. These response values include the red channel response value, the green channel response value, and the blue channel response value. Therefore, after the image sensor 110 performs a light sensing operation for a certain preset color temperature, the processor 130 can obtain a red channel response value, a green channel response value and a blue channel response value.

In step S206, based on a preset condition range of the preset color temperature, the processor 130 may determine whether the response values corresponding to the color channels meet a tolerable condition. Through the implementation of this step, the processor 130 can detect whether the actual color temperature of the light source in the calibration environment seriously deviates from the preset color temperature. For example, when the set target color temperature of the light source in the calibration environment is the preset color temperature "6500K", the processor 130 will determine the color temperature obtained by the image sensor 110 according to the preset condition range corresponding to the preset color temperature "6500K". Whether the response value meets the tolerable condition, thereby detecting whether the actual color temperature of the light source in the calibration environment is significantly different from the default color temperature "6500K".

If the response values of these color channels do not meet the tolerable conditions (step S206 determines No), it means that the actual color temperature of the light source in the calibration environment is too different from the preset color temperature. Specifically, due to the aging phenomenon of the light source in the calibration environment or other human operating factors, there will be a significant gap between the actual color temperature of the light source and the preset color temperature. Therefore, in step S210, in response to determining that the response value does not meet the tolerable condition, the processor 130 may set the preset white balance coefficient to a plurality of final white balance coefficients corresponding to the preset color temperature. The final white balance coefficient also includes the red-green ratio coefficient and the blue-green ratio coefficient. The final white balance coefficient is used for the automatic white balance (AWB) function of the image sensor 110 . That is to say, in response to determining that the response value does not meet the tolerable condition, in order to avoid using erroneous data to correct the preset white balance coefficient, the processor 130 will not correct the preset white balance coefficient, but directly use the preset white balance coefficient as an electronic The final white balance coefficient used by the device 100 to perform the automatic white balance function.

On the other hand, if the response values of these color channels meet the tolerable conditions (yes in step S206), it means that the actual color temperature of the light source in the calibration environment is close to the preset color temperature, that is, the actual color temperature of the light source is in line with expectations. Therefore, in step S208, in response to determining that the response value meets the tolerable condition, the processor 130 may correct the preset white balance coefficient according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature. . The processor 130 may use the red channel response value, the green channel response value and the blue channel response value corresponding to a certain preset color temperature to correct the preset white balance coefficient corresponding to the same preset color temperature. After correcting the preset white balance coefficient, the processor 130 may use the correction result as the final white balance coefficient used by the electronic device 100 to perform the automatic white balance function.

Specifically, FIG. 3 is a flow chart for correcting the preset white balance coefficient according to an embodiment of the present invention. Please refer to Figure 3. Step S208 shown in Figure 2 can be implemented as steps S2081 to S2082. In step S2081, in response to determining that the response value meets the tolerable condition, the processor 130 may obtain a plurality of reference white balance coefficients corresponding to the preset color temperature according to the response value. The reference white balance coefficient may include an R/G proportional coefficient and a B/G proportional coefficient. For example, the processor 130 may obtain an R/G proportional coefficient and a B/G proportional coefficient corresponding to the predetermined color temperature "6500K" based on the RGB response value corresponding to the predetermined color temperature "6500K". The denominator of the R/G scaling factor is the red channel response and the numerator is the green response. The denominator of the B/G scaling factor is the blue channel response and the numerator is the green response.

Next, in step S2082, the processor 130 corrects the preset white balance coefficient according to the reference white balance coefficient to obtain the final white balance coefficient corresponding to the preset color temperature. In some embodiments, the processor 130 may directly set the reference white balance coefficient corresponding to a certain preset color temperature to the final white balance coefficient corresponding to the same preset color temperature. In this way, multiple sets of reference white balance coefficients corresponding to multiple preset color temperatures can directly correspond to multiple points on the corrected color temperature curve. Alternatively, in some embodiments, the processor 130 may translate the preset color temperature curve according to multiple sets of reference white balance coefficients corresponding to multiple preset color temperatures to obtain the corrected color temperature curve, and obtain the corrected color temperature curve corresponding to the plurality of reference white balance coefficients according to the corrected color temperature curve. Multiple sets of final white balance coefficients for preset color temperatures.

For example, FIG. 4 is a schematic diagram of a preset color temperature curve and a corrected color temperature curve according to an embodiment of the present invention. Please refer to FIG. 4. For convenience of explanation, FIG. 4 uses five preset color temperatures as an example for illustration, but the present invention is not limited thereto. The storage device 120 may record a preset white balance coefficient corresponding to the first preset color temperature (i.e., an R/G proportion coefficient “Gr_d1” and a B/G proportion coefficient “GB_d1”), and a preset value corresponding to the first preset color temperature. The white balance coefficient corresponds to point P1 on the preset color temperature curve C1. Similarly, the storage device 120 can record four sets of preset white balance coefficients respectively corresponding to the second preset color temperature, the third preset color temperature, the fourth preset color temperature, and the fifth preset color temperature. By connecting the points P2, P3, P4, and P5 corresponding to these four sets of preset white balance coefficients, the preset color temperature curve C1 can be obtained.

In the example of FIG. 4 , the processor 130 may determine that the RGB channel response value corresponding to the first preset light source meets the tolerable condition. Therefore, the processor 130 can calculate the reference white balance coefficient (ie, the R/G proportional coefficient "Gr_r1" and the B/G proportional coefficient "GB_r1") according to the RGB channel response value corresponding to the first preset light source. In this example, the processor can correct the default white balance coefficient by setting the reference white balance coefficient (i.e., the R/G proportional coefficient "Gr_r1" and the B/G proportional coefficient "GB_r1") as the final white balance coefficient. That is, the reference white balance coefficient corresponding to the first preset color temperature will correspond to the point P6 on the corrected color temperature curve C2. Similarly, the processor 130 can obtain four sets of final white balance coefficients respectively corresponding to the second preset color temperature, the third preset color temperature, the fourth preset color temperature and the fifth preset color temperature according to a similar process, so as to obtain the final white balance coefficients according to these Points P7, P8, P9, and P10 corresponding to the final white balance coefficient obtain the corrected color temperature curve C2. Thereby, the electronic device 100 can perform the automatic white balance function according to the corrected color temperature curve C2, so that the captured image will not suffer from color shift. For example, after the electronic device 100 completes the correction of the white balance coefficient and records the relevant information of the corrected color temperature curve C2, the processor 130 can use the corrected color temperature curve C2 to estimate the scene color temperature and determine based on the corrected color temperature curve C2. The final white balance coefficient used to adjust the image color.

FIG. 5 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention. Referring to FIG. 5 , the method of this embodiment can be executed by the electronic device 100 in FIG. 1 . The details of each step in FIG. 5 will be described below with reference to the components shown in FIG. 1 .

In step S502, the storage device 120 records a plurality of preset white balance coefficients. In step S504, the processor 130 uses the image sensor 110 to perform a light sensing operation under illumination of a light source to obtain multiple response values corresponding to multiple color channels. The detailed implementation of steps S502 to S504 has been described in the previous embodiments and will not be described again here.

In step S506, based on a preset condition range of the preset color temperature, the processor 130 may determine whether the response values corresponding to these color channels meet a tolerable condition. In this embodiment, step S506 may be implemented as steps S5061 to S5064.

In step S5061, the processor 130 obtains at least one color channel proportion coefficient according to the response value. The color channel proportion coefficient includes the red-green proportion coefficient and the blue-green proportion coefficient. Specifically, when correcting the white balance coefficient for the preset color temperature, the processor 130 uses the image sensor 110 to obtain a corrected image corresponding to the preset color temperature, and obtains an RGB channel response value based on the corrected image. Afterwards, the processor 130 may obtain the red-green proportional coefficient and the blue-green proportional coefficient according to the RGB channel response value.

Then, in step S5062, the processor 130 determines whether at least one color channel proportion coefficient is within a proportion range corresponding to the preset color temperature. It should be noted that different preset color temperatures will correspond to different ratio ranges. In addition, in some embodiments, the processor 130 will determine whether the red-green proportional coefficient is within a first proportional range corresponding to a certain preset color temperature, and determine whether the blue-green proportional coefficient is within a first proportional range corresponding to a certain predetermined color temperature. within the second ratio range.

In some embodiments, the ratio range corresponding to the preset color temperature includes a numerical range with one of the preset white balance coefficients as the center of the range. For example, the proportion range corresponding to the preset color temperature "6500K" is determined based on the preset white balance coefficient of the preset color temperature "6500K". The proportion range corresponding to the preset color temperature "5000K" is determined based on the preset white balance coefficient of the preset color temperature "5000K". In more detail, taking FIG. 4 as an example, the proportion range corresponding to the first preset color temperature may include a numerical range with the R/G proportion coefficient "Gr_d1" as the center of the range. The proportional range corresponding to the first preset color temperature may also include a numerical range with the B/G proportional coefficient "Gb_d1" as the center of the range. For example, assuming Gr_d1 is equal to 0.7, the proportion range can be 0.7±0.7*10%. The processor 130 will determine whether the R/G ratio coefficient obtained based on the corrected image is within the numerical range of 0.63˜0.77. From another point of view, the processor 130 will determine whether the point corresponding to the color channel scale coefficient falls within an area centered on point P1.

If at least one color channel proportion coefficient is within the proportion range corresponding to the preset color temperature (step S5062 determines yes), in step S5063, the processor 130 determines that the response value meets the tolerable condition. If at least one color channel proportion coefficient is not within the proportion range corresponding to the preset color temperature (step S5062 determines No), in step S5064, the processor 130 determines that the response value does not meet the tolerable condition.

Next, in step S508, in response to determining that the response value meets the tolerable condition, the processor 130 corrects the preset white balance coefficient according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature. In step S510, in response to determining that the response value does not meet the tolerable condition, the processor 130 sets the preset white balance coefficient to a plurality of final white balance coefficients corresponding to the preset color temperature. The detailed implementation of steps S508 to S510 has been described in the previous embodiments and will not be described again here.

FIG. 6 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention. Referring to FIG. 6 , the method of this embodiment can be executed by the electronic device 100 in FIG. 1 . The details of each step in FIG. 6 will be described below with reference to the components shown in FIG. 1 .

In step S602, the storage device 120 records a plurality of preset white balance coefficients. In step S604, the processor 130 uses the image sensor 110 to perform a light sensing operation under illumination of a light source to obtain multiple response values corresponding to multiple color channels. The detailed implementation of steps S602 to S604 has been described in the previous embodiments and will not be described again here.

In step S606, based on a preset condition range of the preset color temperature, the processor 130 may determine whether the response values corresponding to the color channels meet a tolerable condition. In this embodiment, step S606 can be implemented as steps S6061 to S6063.

In step S6061, the processor 130 determines whether each response value is within a response range corresponding to the preset color temperature. For example, the response range corresponding to the preset color temperature "6500K" includes a first response range, a second response range and a third response range respectively corresponding to RGB channel response values. Similarly, the response range corresponding to the preset color temperature "5000K" also includes the first response range, the second response range and the third response range respectively corresponding to the RGB channel response values. However, different preset color temperatures will correspond to different ratio ranges. , for example, the first response range corresponding to the preset color temperature "5000K" is different from the first response range corresponding to the preset color temperature "6500K".

Specifically, the processor 130 uses the image sensor 110 to obtain a corrected image corresponding to the preset color temperature, and performs statistical calculations on pixel values based on the corrected image to obtain the RGB channel response value. Afterwards, the processor 130 can sequentially determine whether the RGB channel response value is within the corresponding response range. That is, the processor 130 will determine whether the red channel response value is within a response range corresponding to the red channel response value. The processor 130 will determine whether the blue channel response value is within a response range corresponding to the blue channel response value. The processor 130 will determine whether the green channel response value is within a response range corresponding to the green channel response value.

If each response value is within the response range corresponding to the preset color temperature (YES in step S6061), in step S6062, the processor 130 determines that the response value meets the tolerable condition. If one of the response values is not within the response range corresponding to the preset color temperature (step S6061 determines No), in step S6063, the processor 130 determines that the response value does not meet the tolerable condition.

Next, in step S608, in response to determining that the response value meets the tolerable condition, the processor 130 corrects the preset white balance coefficient according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature. In step S610, in response to determining that the response value does not meet the tolerable condition, the processor 130 sets the preset white balance coefficient to a plurality of final white balance coefficients corresponding to the preset color temperature. The detailed implementation of steps S608 to S610 has been described in the previous embodiments and will not be described again here.

It should be noted that the processing procedure of the white balance coefficient correction method executed by at least one processor is not limited to the above embodiment. For example, the steps may be performed in other orders. Furthermore, any two or more of the above steps may be combined, or part of the steps may be modified. Alternatively, other steps may be performed in addition to the above steps.

In summary, in embodiments of the present invention, during the process of correcting the white balance coefficient, whether the actual color temperature of the correction environment deviates significantly from the preset color temperature can be detected. In this way, even if the actual color temperature of the light source in the correction environment is seriously shifted or human error occurs, the use of incorrect data to correct the preset white balance parameters can be avoided, improving the accuracy and reliability of the automatic white balance function. Therefore, it is possible to prevent the electronic device from producing images with lower-than-expected hues due to the automatic white balance function.

Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.

100: Electronic devices

110:Image sensor

120:Storage device

130: Processor

P1～P10: points

C1: Preset color temperature curve

C2: Corrected color temperature curve

S202~S210,S2081~S2082,S502~S510,S5061~S5064,S602~S610,S6061~S6062: steps

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention. FIG. 3 is a flowchart of correcting the preset white balance coefficient according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a preset color temperature curve and a corrected color temperature curve according to an embodiment of the present invention. FIG. 5 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention. FIG. 6 is a flow chart of a white balance coefficient correction method according to an embodiment of the present invention.

S202~S210: steps

Claims (12)

A white balance coefficient correction method suitable for an electronic device including an image sensor. The method includes: recording a plurality of preset white balance coefficients; using the image sensor to perform light sensing under the illumination of a light source. A testing operation is performed to obtain multiple response values corresponding to multiple color channels; based on a preset condition range of a preset color temperature, it is determined whether the response value corresponding to the color channel meets a tolerable condition; reacting to Determine that the response value meets the tolerable condition, and correct the preset white balance coefficient according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature; and in response to determining that the response value does not meet the tolerable condition, setting the preset white balance coefficient to the final white balance coefficient corresponding to the preset color temperature. The white balance coefficient correction method according to claim 1, wherein based on the preset condition range of the preset color temperature, the step of determining whether the response value corresponding to the color channel meets the tolerable condition includes : Obtain at least one color channel proportion coefficient according to the response value; determine whether the at least one color channel proportion coefficient is within a proportion range corresponding to the preset color temperature; if the at least one color channel proportion coefficient is between Within the proportion range corresponding to the preset color temperature, it is determined that the response value meets the tolerable condition; and if the at least one color channel proportion coefficient is not within the range corresponding to the preset color temperature Within the proportion range, it is determined that the response value does not meet the tolerable condition. The white balance coefficient correction method according to claim 2, wherein the proportional range corresponding to the preset color temperature includes a numerical range with one of the preset white balance coefficients as the center of the range. The white balance coefficient correction method according to claim 1, wherein based on the preset condition range of the preset color temperature, the step of determining whether the response value corresponding to the color channel meets the tolerable condition includes : Determine whether each of the response values is within a response range corresponding to the preset color temperature; if each of the response values is within the response range corresponding to the preset color temperature, determine whether the response value The tolerable condition is met; and if one of the response values is not within the response range corresponding to the preset color temperature, it is determined that the response value does not meet the tolerable condition. The white balance coefficient correction method according to claim 1, wherein the preset white balance coefficient and the final white balance coefficient respectively include a red-green proportional coefficient and a blue-green proportional coefficient. The white balance coefficient correction method according to claim 1, wherein the preset white balance coefficient is corrected according to the response value corresponding to the color channel to obtain the final white balance corresponding to the preset color temperature The steps of the coefficient include: obtaining a plurality of reference white balance coefficients corresponding to the preset color temperature according to the response value; and correcting the preset white balance coefficient according to the reference white balance coefficient to obtain The final white balance coefficient corresponding to the preset color temperature. An electronic device includes: an image sensor; a storage device that records a plurality of preset white balance coefficients; a processor coupled to the image sensor and the storage device, and configured to: utilize The image sensor performs a light sensing operation under the illumination of a light source to obtain multiple response values corresponding to multiple color channels; based on a preset condition range of a preset color temperature, it is determined that the color corresponding to the Whether the response value of the channel meets a tolerable condition; in response to determining that the response value meets the tolerable condition, correct the preset white balance coefficient according to the response value corresponding to the color channel to obtain a plurality of final white balance coefficients corresponding to the preset color temperature; and in response to determining that the response value does not meet the tolerable condition, setting the preset white balance coefficients to all final white balance coefficients corresponding to the preset color temperature. Describe the final white balance coefficient. The electronic device of claim 7, wherein the processor is further configured to: obtain at least one color channel proportion coefficient according to the response value; determine whether the at least one color channel proportion coefficient is between the value corresponding to the predetermined value. Set the color temperature to be within a proportional range; if the at least one color channel proportional coefficient is within the proportional range corresponding to the preset color temperature, determine that the response value meets the tolerable condition; and If the at least one color channel proportion coefficient is not within the proportion range corresponding to the preset color temperature, it is determined that the response value does not meet the tolerable condition. The electronic device of claim 8, wherein the proportional range corresponding to the preset color temperature includes a numerical range with one of the preset white balance coefficients as the center of the range. The electronic device of claim 7, wherein the processor is further configured to: determine whether each of the response values is within a response range corresponding to the preset color temperature; if each of the response values is between Within the response range corresponding to the preset color temperature, it is determined that the response value meets the tolerable condition; and if one of the response values is not within the response range corresponding to the preset color temperature Within, it is determined that the response value does not meet the tolerable condition. The electronic device of claim 7, wherein the preset white balance coefficient and the final white balance coefficient include a red-green proportional coefficient and a blue-green proportional coefficient respectively. The electronic device of claim 7, wherein the processor is further configured to: obtain a plurality of reference white balance coefficients corresponding to the preset color temperature according to the response value; and correct according to the reference white balance coefficients The preset white balance coefficient is used to obtain the final white balance coefficient corresponding to the preset color temperature.

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