CN114765681A - Method, device, terminal, system and storage medium for detecting color temperature - Google Patents
Method, device, terminal, system and storage medium for detecting color temperature Download PDFInfo
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Abstract
The application relates to the technical field of color temperature detection processing, and provides a method, a device, a terminal, a system and a storage medium for detecting color temperature. The method includes the steps that comprehensive photosensitive information acquired by collecting ambient light through various focusing pixels in an image sensor is acquired; the different focusing pixels adopt different color channels; and determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature. Therefore, in the method for detecting the color temperature, the color temperature detection function is transferred to the image sensor, the color temperature of the ambient light is measured through the multiple focusing pixels of different color channels of the image sensor, the color temperature detection of the ambient light is realized under the condition that the focusing function of the image sensor is ensured, the color temperature sensor is not required to be additionally installed, the installation space is saved, and the method is suitable for the miniaturization development of equipment.
Description
Technical Field
The present application relates to the field of color temperature detection processing technologies, and in particular, to a method, an apparatus, a terminal, a system, and a storage medium for detecting color temperature.
Background
With the development of sensor processing technology, a technology for detecting color temperature using a sensor has emerged. The technology is widely applied to terminals such as mobile phones and tablet computers, the terminals can obtain color temperature based on the installed color temperature sensors, and intelligent adjustment is further achieved based on the detected color temperature.
However, with the trend of miniaturization of the terminal, the space for mounting each device of the terminal is gradually reduced. Under the condition of ensuring that the terminal carries out intelligent adjustment based on the detected color temperature, the installation space of the terminal needs to be further saved so as to adapt to the miniaturization development trend of the terminal.
Disclosure of Invention
The embodiment of the application provides a method, a device, a terminal, a system and a storage medium for detecting color temperature, which can realize color temperature detection on the basis of ensuring the focusing function of an image sensor.
A method of detecting color temperature, the method comprising:
acquiring comprehensive photosensitive information acquired by collecting ambient light by various focusing pixels in an image sensor; the different focusing pixels adopt different color channels;
and determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature.
In one embodiment, the color channel adopted by one focusing pixel of the plurality of focusing pixels is a white channel.
In one embodiment, before acquiring the comprehensive sensitization information acquired by the plurality of focusing pixels in the image sensor on the ambient light, the method further includes:
and when the image sensor is in a non-imaging mode, controlling each imaging pixel in the image sensor to be in a photosensitive measurement closed state, and controlling the various focusing pixels to be in a photosensitive measurement open state.
In one embodiment, the method further comprises:
determining the corresponding relation between the preset comprehensive light-sensitive information and the light intensity,
determining light intensity corresponding to the comprehensive sensitization information based on the corresponding relation between the preset comprehensive sensitization information and the light intensity, and taking the light intensity corresponding to the comprehensive sensitization information as reference light intensity; the reference light intensity is used for adjusting the screen brightness of the terminal screen under the ambient light.
In one embodiment, the method further comprises:
and when the image sensor is in an imaging mode, adjusting the white balance aiming at the image sensor based on the light intensity corresponding to the comprehensive sensitization information and the color temperature corresponding to the comprehensive sensitization information.
In one of the embodiments, the first and second electrodes are,
the method further comprises the following steps:
obtaining calibration color temperatures of a plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario;
acquiring comprehensive sensitization information acquired by the multiple focusing pixels on the multiple testing environment lights to obtain multiple groups of color temperature sensitization testing results; the calibration color temperature and the comprehensive sensitization information in the same color temperature sensitization test result correspond to the same test environment light;
determining a corresponding relation between comprehensive sensitization information and color temperature based on the multiple groups of color temperature sensitization test results;
and/or the presence of a gas in the atmosphere,
the method further comprises the following steps:
obtaining the calibration light intensity of a plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario;
acquiring comprehensive light sensing information acquired by a plurality of focusing pixels on the plurality of testing environment lights to obtain a plurality of groups of light intensity light sensing test results; the calibration light intensity and the comprehensive light sensing information in the light intensity light sensing test results of the same group correspond to the same test environment light;
and determining the corresponding relation between the comprehensive light sensing information and the light intensity based on the multiple groups of light intensity light sensing test results.
In one embodiment, the acquiring comprehensive exposure information collected by a plurality of focusing pixels in an image sensor on ambient light includes:
acquiring photosensitive information acquired by each focusing pixel on the ambient light;
counting the photosensitive information of a plurality of focusing pixels adopting the same color channel to obtain the statistical photosensitive information of the same focusing pixels;
and obtaining the comprehensive photosensitive information based on the statistical photosensitive information of various focusing pixels.
In one embodiment, a pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, and each calibration area comprises the plurality of focusing pixels;
the determining, based on the preset corresponding relationship between the comprehensive sensitization information and the color temperature, the color temperature corresponding to the comprehensive sensitization information as the color temperature measured by the image sensor for the ambient light includes:
determining the color temperature of each calibration area based on the corresponding relation between the preset comprehensive sensitization information and the color temperature;
and obtaining the color temperature measured by the image sensor on the ambient light based on the color temperature statistics of the plurality of calibration areas.
In one embodiment, the number of focusing pixels adopting different color channels is consistent for the same calibration area; and/or the number of focusing pixels adopting the same color channel is consistent for any two calibration areas.
An apparatus for detecting a color temperature, the apparatus comprising:
the comprehensive photosensitive information acquisition module is used for acquiring comprehensive photosensitive information acquired by various focusing pixels in the image sensor on ambient light; the different focusing pixels adopt different color channels;
and the color temperature measuring module is used for determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature.
A terminal comprising a memory storing a computer program and a processor implementing the method when executing the computer program.
A color temperature detection system, the system comprising an image sensor and a processor;
the image sensor is used for sending comprehensive photosensitive information acquired by various focusing pixels adopting different color channels to the processor;
the processor is used for executing the method based on the comprehensive sensitization information.
In one embodiment, the image sensor includes a white in-focus pixel that employs a white channel.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
According to the method, the device, the terminal, the system and the storage medium for detecting the color temperature, the terminal acquires comprehensive photosensitive information acquired by collecting the ambient light by various focusing pixels in the image sensor; the different focusing pixels adopt different color channels; and determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature. Therefore, in the method for detecting the color temperature, the color temperature detection function is transferred to the image sensor, and the color temperature of the ambient light is measured by adopting various focusing pixels of different color channels on the image sensor, so that the color temperature detection of the ambient light is realized under the condition that the image sensor realizes the focusing function, the terminal does not need to be additionally provided with the color temperature sensor, the installation space of the terminal is saved, and the miniaturization development of the terminal is adapted.
Drawings
FIG. 1 is a diagram illustrating an exemplary embodiment of a method for detecting color temperature;
FIG. 2 is a flow chart illustrating a method for detecting color temperature according to an embodiment;
FIG. 3 is a flowchart illustrating a method for detecting color temperature according to an embodiment;
FIG. 4 is a block diagram showing an exemplary embodiment of an apparatus for detecting a color temperature;
FIG. 5 is a schematic diagram of a white in-focus imaging array unit in one embodiment;
FIG. 6 is a schematic diagram of a green in-focus imaging array unit in one embodiment;
FIG. 7 is a schematic diagram of a red in-focus imaging array unit in one embodiment;
FIG. 8 is a schematic diagram of a blue in-focus imaging array unit in one embodiment;
FIG. 9 is a diagram of a focus pixel coupled to a color temperature detector in one embodiment;
FIG. 10 is a schematic diagram of an imaging array unit in one embodiment;
FIG. 11 is a combination of an in-focus imaging array unit and an imaging array unit in one embodiment;
FIG. 12 is a combined schematic diagram of a focus imaging array unit and an imaging array unit in one embodiment;
FIG. 13 is a combination of a focus imaging array unit and an imaging array unit in one embodiment;
FIG. 14 is a combined schematic diagram of a focus imaging array unit and an imaging array unit in one embodiment;
FIG. 15 is a combined schematic diagram of a focus imaging array unit and an imaging array unit in one embodiment;
fig. 16 is an internal structural view of a terminal in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The color temperature detection method can be applied to terminals such as mobile phones, tablet computers, notebook computers and portable wearable devices.
In an embodiment, with reference to fig. 1 and fig. 2, a method for detecting a color temperature provided by the present application is described, and the method is applied to a terminal as an example:
step S201, acquiring comprehensive photosensitive information acquired by a plurality of focusing pixels in an image sensor on ambient light; the different kinds of focusing pixels adopt different color channels.
As shown in fig. 1, the image sensor is provided with a plurality of focusing pixels (e.g., a focusing pixel a, a focusing pixel B, a focusing pixel C, and a focusing pixel D); the different types of focusing pixels have different color channels, for example, the color channel used by the focusing pixel a is a white channel, the color channel used by the focusing pixel B is a green channel, the color channel used by the focusing pixel C is a blue channel, and the color channel used by the focusing pixel D is a red channel.
The focusing pixels measure ambient light to obtain photosensitive information, the characterization form of the photosensitive information can be brightness information or light intensity information, positive correlation exists between the brightness information and the light intensity information, and the brightness is increased when the light intensity is increased.
The various focusing pixels measure the ambient light to obtain corresponding photosensitive information, such as the focusing pixel A measures to obtain photosensitive information a, the focusing pixel B measures to obtain photosensitive information B, the focusing pixel C measures to obtain photosensitive information C, and the focusing pixel D measures to obtain photosensitive information D.
Step S202, based on the corresponding relation between the preset comprehensive sensitization information and the color temperature, the color temperature corresponding to the comprehensive sensitization information is determined as the color temperature measured by the image sensor for the ambient light.
Wherein, the photosensitive information set comprising the photosensitive information a, the photosensitive information b, the photosensitive information c and the photosensitive information d can be understood as comprehensive photosensitive information; that is, the integrated exposure information is a set of exposure information corresponding to different color channels.
As the color temperature of the ambient light changes, the photosensitive information obtained by measuring various focusing pixels also changes correspondingly; therefore, the change conditions of the comprehensive sensitization information formed by the sensitization information corresponding to various color channels along with the color temperature are subjected to inductive analysis, and the corresponding relation between the comprehensive sensitization information and the color temperature can be determined. In the correspondence, the light sensing information of a plurality of color channels may correspond to one color temperature.
After the terminal obtains the comprehensive sensitization information, the corresponding color temperature can be determined based on the corresponding relation between the preset comprehensive sensitization information and the color temperature, and the color temperature is used as the color temperature measured by the image sensor on the ambient light.
Therefore, in the method for detecting the color temperature, comprehensive photosensitive information acquired by collecting the ambient light by various focusing pixels in the image sensor is acquired; the different focusing pixels adopt different color channels; and determining the color temperature corresponding to the comprehensive sensitization information as the color temperature measured by the image sensor on the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature. That is to say, the color temperature detection function is transferred to the image sensor, and the color temperature of the ambient light is measured through the multiple focusing pixels of different color channels on the image sensor, so that the color temperature detection of the ambient light is realized under the condition that the image sensor realizes the focusing function, the terminal can be free from additionally installing the color temperature sensor, the installation space of the terminal is saved, and the miniaturization development of the terminal is adapted.
In some embodiments, in order to ensure the accuracy of color temperature detection, it is necessary to introduce the photosensitive information corresponding to the white channel; since the image sensor does not have a pixel corresponding to the white channel, if the white channel is introduced to the imaging pixel of the image sensor, the imaging color recovery of the imaging pixel is reduced, and the imaging function of the image sensor is affected.
Thus, in one embodiment, a white channel may be introduced on the focus pixel, i.e. without affecting the imaging and focusing functions of the image sensor, and color temperature detection may also be achieved. Specifically, the color channel adopted by one focusing pixel of the plurality of focusing pixels is a white channel.
In an embodiment, the step S201 may specifically include the following steps: acquiring photosensitive information acquired by each focusing pixel on ambient light; counting the photosensitive information of a plurality of focusing pixels adopting the same color channel to obtain the statistical photosensitive information of the same focusing pixels; and obtaining comprehensive photosensitive information based on the statistical photosensitive information of various focusing pixels.
Illustratively, if the image sensor includes 400 focusing pixels, where the white focusing pixel (i.e., the focusing pixel using the white channel) is 100, the red focusing pixel is 100, the green focusing pixel is 100, and the blue focusing pixel is 100; then, after acquiring the photosensitive information acquired by the 400 focusing pixels for the ambient light, the terminal counts the photosensitive information of the same color channel to obtain corresponding statistical photosensitive information, for example, counts the photosensitive information of the white focusing pixels to obtain statistical photosensitive information corresponding to the white channel; the statistical method may be to sum the exposure information of the same color channel.
Based on the statistical sensitization information corresponding to the white channel, the statistical sensitization information corresponding to the red channel, the statistical sensitization information corresponding to the green channel, and the statistical sensitization information corresponding to the blue channel, a statistical sensitization information set, i.e., comprehensive sensitization information, can be formed.
In the above embodiment, when a plurality of focusing pixels exist in each color channel, the photosensitive information of different color channels is classified and counted, so that the accuracy of color temperature detection can be ensured.
Further, the pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, and each calibration area comprises a plurality of focusing pixels. When the step S203 is executed, the method may include the following steps: determining the color temperature of each calibration area based on the corresponding relation between the preset comprehensive sensitization information and the color temperature; and obtaining the color temperature of the image sensor for the ambient light measurement based on the color temperature statistics of the plurality of calibration areas.
Illustratively, if the pixel photosensitive area of the image sensor is divided into calibration areas (r) to (c), wherein each calibration area includes focusing pixels of the same kind, for example, each including a white focusing pixel, a red focusing pixel, a blue focusing pixel, and a green focusing pixel. The terminal can respectively count the comprehensive photosensitive information of each calibration area and determine the corresponding color temperature; if the terminal determines that the color temperatures of the calibration regions from (i) to (ii) are 2500K (kelvin), 2600K, 3000K, 2600K, 2650K, and 2600K, respectively, the calibration region with the color temperature of 2600K is detected, so that 2600K can be used as the color temperature of the image sensor for measuring ambient light.
In the above manner, the pixel photosensitive area of the image sensor is divided into different calibration areas, the color temperature of each calibration area is counted, the final color temperature is determined, and the accuracy of color temperature detection can be improved.
Furthermore, aiming at the same calibration area, the number of focusing pixels adopting different color channels is consistent; for example, for the calibration region (i), the numbers of white focusing pixels, red focusing pixels, green focusing pixels and blue focusing pixels are all 100, so that the accuracy of color temperature detection can be ensured.
Furthermore, aiming at any two calibration areas, the number of focusing pixels adopting the same color channel is consistent; for example, the number of white focusing pixels is 100 for the calibration region (i) and the calibration region (ii) to ensure the accuracy of color temperature detection.
In one embodiment, before performing step S201, the terminal may further perform the following steps: and when the image sensor is in a non-imaging mode, controlling each imaging pixel in the image sensor to be in a photosensitive measurement closed state, and controlling various focusing pixels to be in a photosensitive measurement open state.
That is to say, if the image sensor is in the non-imaging mode, then the imaging pixels of the image sensor may be in a photosensitive measurement off state, and only various focusing pixels are turned on, and then the color temperature of the ambient light is determined according to the comprehensive photosensitive information acquired by the turned-on various focusing pixels on the ambient light, so that the energy consumption of the terminal may be further saved, and the service life of the image sensor may be prolonged.
Further, if the image sensor is in a non-imaging mode, and a pixel photosensitive area of the image sensor is divided into a plurality of calibration areas; in order to further save the energy consumption of the terminal, the focusing pixels of each calibration area can be controlled to be alternately in the photosensitive measurement on state, that is, in the photosensitive measurement on state at different time intervals. For example, the focusing pixels of the calibration areas (i), (iii) and (iv) are in a light sensing measurement on state in the first time period, and the focusing pixels of the calibration areas (ii), (iv) and (iv) are in a light sensing measurement off state in the first time period; aiming at a second time interval adjacent to the first time interval, focusing pixels in the calibration areas (i), (iii) and (iv) enter a photosensitive measurement closed state in the second time interval, and focusing pixels in the calibration areas (ii), (iii) and (iv) are in a photosensitive measurement open state in the first time interval.
In an embodiment, after the terminal further performs step S201, the following steps may be further performed: determining a corresponding relation between preset comprehensive light sensing information and light intensity, determining the light intensity corresponding to the comprehensive light sensing information based on the corresponding relation between the preset comprehensive light sensing information and the light intensity, and taking the light intensity corresponding to the comprehensive light sensing information as reference light intensity; the reference light intensity is used to adjust the screen brightness of the terminal screen under ambient light.
In the above embodiment, the terminal may further determine the corresponding light intensity based on the comprehensive light sensing information acquired by the plurality of focusing pixels for the ambient light, and the light intensity may be used to manage the screen brightness of the terminal screen, so that the terminal may not need to additionally install the light intensity detector, further saving the installation space, and facilitating the miniaturization of the terminal.
In one embodiment, the terminal may further perform the following steps to determine a correspondence between the integrated sensitization information and the color temperature. The steps executed by the terminal specifically include: acquiring calibration color temperatures of a plurality of test environment lights; a plurality of test ambient lights are given an ambient light under a test scenario; acquiring comprehensive sensitization information acquired by a plurality of focusing pixels for a plurality of testing environment lights to obtain a plurality of groups of color temperature sensitization testing results; the calibration color temperature and the comprehensive sensitization information in the same color temperature sensitization test result correspond to the same test environment light; and determining the corresponding relation between the comprehensive sensitization information and the color temperature based on the multiple groups of color temperature sensitization test results.
Therefore, corresponding comprehensive sensitization information is obtained by giving test environment light with different color temperatures; obtaining a plurality of groups of color temperature sensitization test results according to the calibrated color temperature corresponding to the same test environment light and the corresponding comprehensive sensitization information; the corresponding relation between the comprehensive sensitization information and the color temperature determined according to the multiple groups of color temperature sensitization test results is more accurate, and the accuracy of color temperature detection is improved.
Further, in the case that the pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, the correspondence between the integrated photosensitive information and the color temperature of each calibration area may be determined respectively. For example, when the color temperature of given test environment light is 3000K, acquiring sensitization information acquired by white/green/red/blue focusing pixels of a calibration region (i) on the test environment light, and counting statistical sensitization information corresponding to the same color channel to form comprehensive sensitization information, thereby obtaining a group of color temperature sensitization test results including the comprehensive sensitization information and the calibration color temperature 3000K; according to the mode, a plurality of groups of color temperature sensitization test results are obtained, and the corresponding relation between the comprehensive sensitization information of the calibration region I and the color temperature is determined.
In one embodiment, the terminal may further perform the following steps to determine the correspondence between the integrated exposure information and the light intensity. The steps executed by the terminal specifically include: obtaining the calibration light intensity of a plurality of test environment lights; a plurality of test ambient lights are given ambient lights under a test scenario; acquiring comprehensive light sensing information acquired by a plurality of focusing pixels on a plurality of testing environment lights to obtain a plurality of groups of light intensity light sensing test results; the calibration light intensity and the comprehensive light sensing information in the light intensity light sensing test results of the same group correspond to the same test environment light; and determining the corresponding relation between the comprehensive light-sensitive information and the light intensity based on the light-sensitive test results of the multiple groups of light intensities.
Therefore, corresponding comprehensive photosensitive information is obtained by giving test environment light with different light intensities; obtaining a plurality of groups of light intensity sensitization test results according to the calibrated light intensity corresponding to the same test environment light and the corresponding comprehensive sensitization information; the corresponding relation between the comprehensive light sensing information and the light intensity determined according to the multiple groups of light intensity light sensing test results is more accurate, and the accuracy of light intensity detection is improved.
Further, in the case that the pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, the corresponding relationship between the integrated photosensitive information and the light intensity of each calibration area can be determined respectively. The specific manner may refer to the content of the correspondence between the color temperature and the comprehensive photosensitive information of the first calibration area, which is not described herein again.
In one embodiment, the terminal may further perform the following steps: and when the image sensor is in an imaging mode, adjusting white balance aiming at the image sensor based on the light intensity corresponding to the comprehensive sensitization information and the color temperature corresponding to the comprehensive sensitization information.
That is, the terminal may obtain corresponding color temperature and light intensity using the integrated light sensing information measured by various focusing pixels of different channels, and adjust the white balance of the image sensor according to the obtained color temperature and light intensity to improve the imaging quality.
In one embodiment, the focusing pixel structure is a metal-shielded photodiode structure, a dual photodiode (dual PD pixel) structure, or an On-Chip microlens photodiode structure (2 × 1OCL pixel or 2 × 2OCL pixel; OCL: On-Chip Lens, On-Chip microlens).
For better understanding of the above method, an application example of the method for detecting color temperature of the present application is described with reference to fig. 3. The application example can be applied to a terminal, and specifically executes the following steps:
step S301, obtaining calibration color temperatures of a plurality of test environment lights; a plurality of test ambient lights are given an ambient light under a test scenario;
step S302, acquiring comprehensive sensitization information acquired by a plurality of focusing pixels in an image sensor for a plurality of testing environment lights to obtain a plurality of groups of color temperature sensitization testing results; the color channels adopted by different focusing pixels are different, and the calibration color temperature and the comprehensive sensitization information in the sensitization test result of the same color temperature correspond to the same test environment light;
step S303, determining the corresponding relation between the comprehensive sensitization information and the color temperature based on a plurality of groups of color temperature sensitization test results;
step S304, controlling each imaging pixel in the image sensor to be in a photosensitive measurement closed state and controlling various focusing pixels to be in a photosensitive measurement open state when the image sensor is in a non-imaging mode;
step S305, acquiring comprehensive photosensitive information acquired by a plurality of focusing pixels in the image sensor on ambient light;
and step S306, determining the color temperature corresponding to the comprehensive sensitization information based on the corresponding relation between the preset comprehensive sensitization information and the color temperature, and using the color temperature as the color temperature measured by the image sensor for the ambient light.
In the application example, the corresponding comprehensive photosensitive information is obtained by giving the test environment light with different light intensities; obtaining a plurality of groups of light intensity sensitization test results according to the calibrated light intensity corresponding to the same test environment light and the corresponding comprehensive sensitization information; the corresponding relation between the comprehensive light-sensitive information and the light intensity determined according to the light-sensitive test results of the multiple groups of light intensities is more accurate, and the accuracy of light intensity detection is improved. And moreover, the color temperature detection function is transferred to the image sensor, the color temperature of the ambient light is measured through various focusing pixels of different color channels of the image sensor, and the color temperature detection of the image sensor on the ambient light is realized under the condition that the imaging function and the focusing function of the image sensor are ensured, so that the terminal does not need to be additionally provided with the color temperature sensor, the installation space of the terminal is saved, and the miniaturization development of the terminal is adapted.
It should be understood that, although the steps in the flowcharts of fig. 1 to 3 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in fig. 1 to 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
In one embodiment, as shown in fig. 4, there is provided an apparatus for detecting a color temperature, including:
a comprehensive photosensitive information obtaining module 401, configured to obtain comprehensive photosensitive information obtained by collecting ambient light by multiple focusing pixels in the image sensor; the different focusing pixels adopt different color channels;
and the color temperature measuring module 402 is configured to determine, based on a preset corresponding relationship between the comprehensive exposure information and a color temperature, a color temperature corresponding to the comprehensive exposure information as a color temperature measured by the image sensor for the ambient light.
In one embodiment, the color channel employed by one of the plurality of focusing pixels is a white channel.
In one embodiment, the apparatus further comprises: and the photosensitive measurement state control module is used for controlling each imaging pixel in the image sensor to be in a photosensitive measurement closed state and controlling the various focusing pixels to be in a photosensitive measurement open state when the image sensor is in a non-imaging mode.
In one embodiment, the apparatus further comprises: the screen brightness control module is used for determining the corresponding relation between preset comprehensive photosensitive information and light intensity, determining the light intensity corresponding to the comprehensive photosensitive information based on the corresponding relation between the preset comprehensive photosensitive information and the light intensity, and taking the light intensity corresponding to the comprehensive photosensitive information as reference light intensity; the reference light intensity is used for adjusting the screen brightness of the terminal screen under the ambient light.
In one embodiment, the apparatus further comprises: and the white balance adjusting module is used for adjusting the white balance of the image sensor based on the light intensity corresponding to the comprehensive photosensitive information and the color temperature corresponding to the comprehensive photosensitive information when the image sensor is in an imaging mode.
In one embodiment, the apparatus further comprises: the first corresponding relation determining module is used for acquiring the calibration color temperatures of the plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario; acquiring comprehensive sensitization information acquired by the multiple focusing pixels on the multiple testing environment lights to obtain multiple groups of color temperature sensitization testing results; the calibration color temperature and the comprehensive sensitization information in the same color temperature sensitization test result correspond to the same test environment light; and determining the corresponding relation between the comprehensive sensitization information and the color temperature based on the multiple groups of color temperature sensitization test results.
In one embodiment, the apparatus further comprises: the second corresponding relation determining module is used for acquiring the calibrated light intensity of the plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario; acquiring comprehensive light sensing information acquired by a plurality of focusing pixels on the plurality of testing environment lights to obtain a plurality of groups of light intensity light sensing test results; the calibration light intensity and the comprehensive light sensing information in the light intensity light sensing test results of the same group correspond to the same test environment light; and determining the corresponding relation between the comprehensive light sensing information and the light intensity based on the multiple groups of light intensity light sensing test results.
In an embodiment, the comprehensive photosensitive information obtaining module 401 is further configured to obtain photosensitive information obtained by collecting the ambient light by each focusing pixel; counting the photosensitive information of a plurality of focusing pixels adopting the same color channel to obtain the statistical photosensitive information of the same focusing pixels; and obtaining the comprehensive photosensitive information based on the statistical photosensitive information of various focusing pixels.
In one embodiment, a pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, and each calibration area comprises the plurality of focusing pixels; the color temperature measuring module 402 is further configured to determine color temperatures of the calibration areas based on a corresponding relationship between the preset comprehensive sensitization information and the color temperatures; and obtaining the color temperature measured by the image sensor on the ambient light based on the color temperature statistics of the plurality of calibration areas.
In one embodiment, the number of focusing pixels adopting different color channels is consistent for the same calibration area; and/or the number of focusing pixels adopting the same color channel is consistent for any two calibration areas.
For the specific definition of the device for detecting color temperature, reference may be made to the above definition of the method for detecting color temperature, which is not described herein again. The modules in the device for detecting color temperature can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The application also provides a color temperature detection system, which comprises an image sensor and a processor; the image sensor is used for sending comprehensive photosensitive information acquired by collecting ambient light by various focusing pixels adopting different color channels to the processor; the processor is configured to perform the method of any of the other embodiments based on the integrated exposure information.
Further, the image sensor includes a white focus pixel employing a white channel.
In some embodiments, the present application is described in conjunction with fig. 5 to provide an image sensor including white focus pixels Wa and Wb using a white channel; the white focusing pixels Wa and Wb collect the photosensitive information of the ambient light, and the photosensitive information is used for detecting the color temperature of the ambient light.
A white focusing pixel Wa is described with reference to fig. 5, the white focusing pixel Wa includes a photosensitive region and a non-photosensitive region, a black portion in the white focusing pixel Wa represents the non-photosensitive region, and a white portion is an induced white region; similarly, the white focus pixel Wb can refer to the above description, which is not repeated herein. And the positions of the white focus pixels Wa and Wb may be interchanged.
That is to say, a white channel is introduced to a focusing pixel of the image sensor to form a white focusing pixel, and the photosensitive information acquired by the white focusing pixel on the ambient light can be used for imaging focusing and color temperature detection, so that the color temperature detection of the image sensor on the ambient light is realized on the basis of not influencing the focusing function of the image sensor.
In the foregoing embodiment, in the color temperature detection process, if the photosensitive information corresponding to other color channels is needed, for example, the photosensitive information corresponding to a red color channel, the photosensitive information obtained by collecting the ambient light by using a red imaging pixel (e.g., R shown in fig. 5) may be used; it is understood that the sensed information collected by the blue imaging pixel (B) and the green imaging pixel (G) shown in fig. 5 for the ambient light can also be used for color temperature detection. The imaging pixels of the color channels are not provided with non-photosensitive areas similar to focusing pixels, and only comprise photosensitive areas for imaging.
That is to say, in the above manner, the photosensitive information corresponding to the white channel required for color temperature detection is acquired by using the focusing pixel, and the photosensitive information corresponding to the red channel/blue channel/green channel required for color temperature detection is acquired by using the imaging pixel, thereby ensuring the accuracy of color temperature detection. However, in this method, even if the image sensor is in the non-imaging mode, if color temperature detection is required, the focus pixel and the imaging pixel need to be controlled to be in the on state for light sensing measurement, which causes a problem of large power consumption.
Thus, in some embodiments, the image sensor further comprises at least one of a red focus pixel employing a red channel, a blue focus pixel employing a blue channel, or a green focus pixel employing a green channel. At least one of the sensitization information acquired by the red focusing pixel on the ambient light, the sensitization information acquired by the blue focusing pixel on the ambient light and the sensitization information acquired by the green focusing pixel on the ambient light is used for color temperature detection.
That is to say, the photosensitive information corresponding to each color channel required by color temperature detection is provided by the focusing pixel, no imaging pixel is required, if the image sensor is in a non-imaging mode and the color temperature needs to be detected at the moment, only the focusing pixel needs to be controlled to be in a photosensitive measurement starting state, and the power consumption is reduced.
Further, for an imaging pixel included in the image sensor, a switch to which the imaging pixel is connected is different from a switch to which the color focus pixel is connected. Therefore, if the image sensor is in a non-imaging mode, the switch connected with the imaging pixel can be used for controlling the imaging pixel to be in a photosensitive measurement closed state, and the switch connected with the focusing pixel is used for controlling the focusing pixel to be in a photosensitive measurement open state, so that photosensitive information corresponding to a color channel is obtained, and color temperature detection is realized.
Among them, a pixel unit including a color focus pixel (the pixel unit may be a 2 × 2 pixel matrix) may be referred to as a focus unit; if the color-focusing pixel is a white-focusing pixel, the focusing unit can be called a white-focusing unit, such as W110a and W110b shown in fig. 5. In the white focus unit W110a, white focus pixels Wa and G are diagonally distributed, and R and B are diagonally distributed.
In some embodiments, the image sensor further comprises an imaging unit located between the two focusing units, i.e. the imaging unit is spaced between the two focusing units. Among them, a pixel unit including only an imaging pixel is referred to as an imaging unit, as 120 shown in fig. 5. In the imaging unit 120, only the imaging pixels R, G and B are included, and two G are diagonally distributed, and R and B are diagonally distributed.
If the focusing units distributed at the two sides of the imaging unit contain the same color focusing pixels, the focusing shielding structures of the same focusing color focusing pixels form a left-right focusing shielding structure pair.
Illustratively, as shown in fig. 5, the white focus units W110a and W110b distributed on both sides of the imaging unit 120 each include a white focus pixel, and the blocking area of the white focus pixel Wa is located on the left and the blocking area of the white focus pixel Wb is located on the right, i.e., the focus blocking structures of the white focus pixels Wa and Wb form a left-right focus blocking structure pair. Among them, a unit formed by the white focus unit W110a, the white focus unit W110b, and the imaging unit 120 may be referred to as a white focus imaging array unit (W pattern).
Also illustratively, as shown in fig. 6, the green focusing units G110a and G110b distributed on both sides of the imaging unit 120 each include a green focusing pixel, and the blocking area of the green focusing pixel Ga is located on the right and the blocking area of the green focusing pixel Gb is located on the left, i.e., the focusing blocking structures of the green focusing pixels Ga and Gb form a left-right focusing blocking structure pair. Among them, the unit formed by the green focusing unit G110a, the green focusing unit G110b and the imaging unit 120 may be referred to as a green focus imaging array unit (G pattern).
Further illustratively, as shown in fig. 7, the red focusing units R110a and R110b distributed on both sides of the imaging unit 120 each include a red focusing pixel, and the blocking area of the red focusing pixel Ra is located on the left, and the blocking area of the red focusing pixel Rb is located on the right, i.e., the focusing blocking structures of the red focusing pixels Ra and Rb form a pair of left and right focusing blocking structures. The unit formed by the red focusing unit R110a, the red focusing unit R110b and the imaging unit 120 can be referred to as a red focusing imaging array unit (R pattern).
Further illustratively, as shown in fig. 8, the blue focusing units B110a and B110B distributed at both sides of the imaging unit 120 each include a blue focusing pixel, and the shielding region of the blue focusing pixel Ba is located at the right and the shielding region of the blue focusing pixel Bb is located at the left, i.e., the focusing shielding structures of the blue focusing pixels Ba and Bb form a left-right focusing shielding structure pair. The unit formed by the blue focusing unit B110a, the blue focusing unit B110B and the imaging unit 120 can be referred to as a blue focusing imaging array unit (B pattern).
In one embodiment, as shown in fig. 9, the image sensor further includes a color temperature processor, each color focusing pixel is connected to the color temperature processor, and each color focusing pixel transmits the sensed information acquired from the ambient light to the color temperature processor, so that the color temperature processor determines the color temperature of the ambient light based on the sensed information corresponding to each color channel. It can be understood that the color temperature processor of the above embodiment is built in the image sensor, so as to further save the space of the mobile phone and other terminals; in other embodiments, the color temperature processor may also be external to the image sensor.
In the above embodiment, if the focusing units distributed at both sides of the imaging unit 120 include the same color focusing pixels and form a pair of left and right focusing shielding structures, the distribution direction of the focusing units may be referred to as a first direction. As shown in fig. 10, if a plurality of imaging units 120 are arranged adjacently along a first direction, the correspondingly formed units may be referred to as imaging array units (CX patterns).
In some embodiments, the above-mentioned focusing imaging array units may be arranged adjacently along a second direction orthogonal to the first direction, but in order to ensure the imaging effect, two focusing imaging array units may be arranged along the second direction at a distance of at least one imaging array unit, that is, the image sensor includes at least one imaging array unit located between two focusing imaging array units.
The focusing array units distributed on both sides of the imaging array unit CX pattern may correspond to the same color channel, and as shown in fig. 11, the white focusing array units W pattern are distributed on both sides of the imaging array unit CX pattern along the second direction.
In order to further ensure the accuracy of color temperature detection, the focusing imaging array units distributed on both sides of the imaging array unit CX pattern along the second direction may correspond to different color channels, such as a white focusing imaging array unit W pattern and a red focusing imaging array unit R pattern, a green focusing imaging array unit G pattern and a blue focusing imaging array unit B pattern, and a white focusing imaging array unit W pattern and a green focusing imaging array unit G pattern. As shown in fig. 12, the focus imaging array units distributed on both sides of the imaging array unit CX pattern along the second direction are a white focus imaging array unit W pattern and a red focus imaging array unit R pattern.
That is, the focusing units distributed along the second direction at two sides of the imaging unit 120 include different color focusing pixels, as shown in fig. 12, the focusing units distributed along the second direction at two sides of the imaging unit 120 are respectively a white focusing unit and a red focusing unit, and the focusing pixels included in the white focusing unit and the red focusing unit are respectively a white focusing pixel and a red focusing pixel.
In some embodiments, if the image sensor simultaneously introduces a white pixel, a green pixel, a blue pixel and a red pixel into the focused pixels, in order to ensure uniformity of distribution of the pixels and accuracy of color temperature detection, the color pixels corresponding to at least four focused imaging array units adjacent to each other at intervals of the imaging array unit CX pattern are different from each other. As shown in fig. 13, the white focus imaging array unit W pattern, the red focus imaging array unit R pattern, the blue focus imaging array unit B pattern, and the green focus imaging array unit G pattern are uniformly distributed on two sides of each imaging array unit CX pattern.
That is to say, the image sensor includes four focusing units sequentially arranged along the second direction, the four focusing units include different color focusing pixels, and two adjacent focusing units of the four focusing units are spaced by an imaging unit. As shown in fig. 13, a white focusing unit, a red focusing unit, a blue focusing unit and a green focusing unit are sequentially arranged along the second direction; and an imaging unit is arranged between two adjacent focusing units at intervals, for example, an imaging unit is arranged between a white focusing unit and a red focusing unit, and for example, an imaging unit is arranged between a red focusing unit and a blue focusing unit.
Further, as shown in fig. 14, the at least four focusing and imaging array units may be arranged in an interval manner, such as a white focusing and imaging array unit, a green focusing and imaging array unit, a red focusing and imaging array unit, and a blue focusing and imaging array unit. That is, the four focusing units sequentially arranged along the second direction are respectively a white focusing unit, a green focusing unit, a red focusing unit and a blue focusing unit in order.
Further, if the requirement for the imaging effect is high, as shown in fig. 15, there may be two imaging units 120 included in the white focus imaging array unit, the green focus imaging array unit, the red focus imaging array unit, the blue focus imaging array unit, and the imaging array unit. Furthermore, the number of the imaging array units spaced between the two in-focus imaging array units can also be two or more.
Furthermore, the focusing pixel structure of the above embodiments is a metal-shielded photodiode structure, a dual photodiode (dual PD pixel) structure, or an On-Chip microlens photodiode structure (2 × 1OCL pixel or 2 × 2OCL pixel; OCL: On-Chip Lens, On-Chip microlens), and is widely applicable to image sensors with various focusing structures.
In one embodiment, a terminal, which may be a mobile phone, a tablet computer, a portable wearable device, or the like, is provided, and an internal structure diagram thereof may be as shown in fig. 16. The terminal comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the terminal is configured to provide computing and control capabilities. The memory of the terminal comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The communication interface of the terminal is used for carrying out wired or wireless communication with other terminals, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of detecting a color temperature. The display screen of the terminal can be a liquid crystal display screen or an electronic ink display screen, and the input device of the terminal can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on a shell of the terminal, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 16 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, and that a particular terminal may include more or less components than those shown, or may have some components combined, or may have a different arrangement of components.
In one embodiment, a terminal is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the respective method embodiment as described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. A method of detecting color temperature, the method comprising:
acquiring comprehensive photosensitive information acquired by collecting ambient light by various focusing pixels in an image sensor; the different focusing pixels adopt different color channels;
and determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature.
2. The method of claim 1, wherein the color channel used by the focusing pixel of one of the plurality of focusing pixels is a white channel.
3. The method of claim 1, wherein prior to obtaining the integrated exposure information collected for the ambient light by the plurality of focusing pixels in the image sensor, the method further comprises:
and when the image sensor is in a non-imaging mode, controlling each imaging pixel in the image sensor to be in a photosensitive measurement closed state, and controlling the various focusing pixels to be in a photosensitive measurement open state.
4. The method of claim 1, further comprising:
determining the corresponding relation between the preset comprehensive photosensitive information and the light intensity,
determining light intensity corresponding to the comprehensive sensitization information based on the corresponding relation between the preset comprehensive sensitization information and the light intensity, and taking the light intensity corresponding to the comprehensive sensitization information as reference light intensity; the reference light intensity is used for adjusting the screen brightness of the terminal screen under the ambient light.
5. The method of claim 4, further comprising:
and when the image sensor is in an imaging mode, adjusting white balance aiming at the image sensor based on the light intensity corresponding to the comprehensive sensitization information and the color temperature corresponding to the comprehensive sensitization information.
6. The method according to any one of claims 1 to 5,
the method further comprises the following steps:
obtaining calibration color temperatures of a plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario;
acquiring comprehensive sensitization information acquired by the multiple focusing pixels for the multiple testing environment lights to obtain multiple groups of color temperature sensitization testing results; the calibration color temperature and the comprehensive sensitization information in the same color temperature sensitization test result correspond to the same test environment light;
determining a corresponding relation between comprehensive sensitization information and color temperature based on the multiple groups of color temperature sensitization test results;
and/or the presence of a gas in the gas,
the method further comprises the following steps:
obtaining the calibration light intensity of a plurality of test environment lights; the plurality of test ambient lights are given an ambient light under a test scenario;
acquiring comprehensive light sensing information acquired by a plurality of focusing pixels on the plurality of testing environment lights to obtain a plurality of groups of light intensity light sensing test results; the calibration light intensity and the comprehensive light sensing information in the light intensity light sensing test results of the same group correspond to the same test environment light;
and determining the corresponding relation between the comprehensive light-sensitive information and the light intensity based on the light-sensitive test results of the multiple groups of light intensities.
7. The method of claim 1, wherein the obtaining of the integrated exposure information collected for the ambient light by the plurality of focusing pixels in the image sensor comprises:
acquiring photosensitive information acquired by each focusing pixel on the ambient light;
counting the photosensitive information of a plurality of focusing pixels adopting the same color channel to obtain the statistical photosensitive information of the same focusing pixels;
and obtaining the comprehensive photosensitive information based on the statistical photosensitive information of various focusing pixels.
8. The method of claim 7, wherein a pixel photosensitive area of the image sensor is divided into a plurality of calibration areas, each calibration area including the plurality of focusing pixels;
the determining, based on a preset correspondence between the comprehensive sensitization information and the color temperature, the color temperature corresponding to the comprehensive sensitization information as the color temperature measured by the image sensor for the ambient light includes:
determining the color temperature of each calibration area based on the corresponding relation between the preset comprehensive sensitization information and the color temperature;
and obtaining the color temperature measured by the image sensor on the ambient light based on the color temperature statistics of the plurality of calibration areas.
9. The method according to claim 8, wherein the number of focusing pixels adopting different color channels is the same for the same calibration area; and/or the number of focusing pixels adopting the same color channel is consistent for any two calibration areas.
10. An apparatus for detecting a color temperature, the apparatus comprising:
the comprehensive photosensitive information acquisition module is used for acquiring comprehensive photosensitive information acquired by collecting ambient light by various focusing pixels in the image sensor; the different focusing pixels adopt different color channels;
and the color temperature measuring module is used for determining the color temperature corresponding to the comprehensive sensitization information as the color temperature of the image sensor for measuring the ambient light based on the corresponding relation between the preset comprehensive sensitization information and the color temperature.
11. A terminal comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the method of any of claims 1 to 9.
12. A color temperature detection system, characterized in that the system comprises an image sensor and a processor;
the image sensor is used for sending comprehensive photosensitive information acquired by collecting ambient light by various focusing pixels adopting different color channels to the processor;
the processor configured to perform the method of any one of claims 1 to 9 based on the integrated exposure information.
13. The system of claim 12, wherein the image sensor comprises a white focus pixel employing a white channel.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 9.
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