CN115052387B - Blackbody locus and isotherm toning control method and its application - Google Patents

Abstract

The application provides a black body track and isotherm toning control method and application thereof, comprising the following steps: acquiring inherent maximum brightness of each primary color of a light source, inherent color coordinates corresponding to each primary color and color mixing parameters input by a user; calculating a u 'v' color coordinate in a CIE1976-u 'v' system according to a set abscissa, and taking the u 'v' color coordinate as an intersection point of a black body trajectory line and a corresponding isothermal line; calculating a target color mixing coordinate according to the greenish color mixing parameter or the reddish color mixing parameter, the u 'v' color coordinate and the adjustment step length of the isotherm; acquiring a total value of mixed brightness of each primary color and brightness corresponding to each primary color according to the target mixed color coordinate; and calculating the duty ratio according to the inherent highest brightness of each primary color and the brightness corresponding to each primary color and outputting to control the light source. The black body locus expression can conveniently and continuously adjust the light, so that a user can freely adjust the color on the isotherm according to the scene requirement, and more light color requirements are met.

Description

Blackbody Locus and Isotherm Line Toning Control Method and Its Application

technical field

The present application relates to the technical field of lighting control, in particular to black body locus and isotherm line toning control methods and applications thereof.

Background technique

Color temperature is closely related to life, and different color temperatures can be adjusted with light sources to create different atmospheres for people. Color temperature is a physical quantity used in lighting optics to define the color of a light source. For example, the color temperature of yellow light is 3000K, and the daytime color temperature under sunlight is 6500K.

In the CIE1931-xy chromaticity diagram (Figure 2), the inner horizontal arc curve is the blackbody locus, and different points on the blackbody locus represent different color temperatures. The straight line intersecting the blackbody locus is an isotherm, and the points on the isotherm represent the same correlated color temperature. For example, on the isotherm line of 6000K in the figure, all points on it indicate that the correlated color temperature is 6000K. Under the same correlated color temperature, the color may be greenish (above the blackbody locus line) or reddish (below the blackbody locus line) .

During the packaging and manufacturing of LED light sources in the prior art, the light color of the packaged product is directly affected by processes such as chip differences, the type and concentration ratio of phosphor powder, and the uniformity of glue volume, making it difficult for the color coordinates of the white light source to fall on the black body locus. . For example, the Chinese patent CN108021536A discloses "a method for obtaining chromaticity coordinates corresponding to the color temperature on the blackbody locus line of color temperature", which guides LEDs to be divided into BINs (binning), for example, the isotherm (according to the distance from the blackbody locus line) Cut into several segments to separate into different BINs. However, different batches of light sources or different models of light sources with the same correlated color temperature use different BIN light sources. Light sources with different BINs will produce color cast.

Moreover, it is stated in the patent abstract that "calculate the chromaticity coordinates ccx and ccy values corresponding to each color temperature (CCT) at intervals of 100K from 1500K-100000K in turn according to this method", it can be seen that the calculation amount is large and the obtained color Coordinates are just discrete points on the blackbody locus. In the actual dimming and color adjustment application scenarios, it is necessary to freely and continuously adjust the color on the black body locus without paying attention to the specific value of the current corresponding color temperature.

Therefore, it is urgent to develop a function that can freely continuously adjust color on the black body locus line, and can adjust color on the isotherm line, so as to integrate light sources with different correlated color temperatures and meet users' needs for more light colors.

Contents of the invention

The embodiment of the present application provides a blackbody locus and isotherm line color grading control method and its application, aiming at the problem that the current technology cannot freely and continuously color tone on the blackbody locus line and can color tone on the isotherm line.

The core technology of the present invention is mainly to realize the control method of color matching on the isotherm line. For the multi-primary color light source, it receives the user’s color temperature input, receives the user’s color cast adjustment, and outputs the corresponding PWM-driven light source through the color matching operation to realize the target color freely on the isotherm line. adjust.

In a first aspect, the present application provides a method for controlling blackbody locus and isotherm color adjustment, the method comprising the following steps:

S00. Obtain the inherent maximum brightness of each primary color of the light source, the inherent color coordinates corresponding to each primary color, and the color adjustment parameters input by the user, wherein the color adjustment parameters include the set abscissa of the blackbody locus, greenish color adjustment parameters, and reddish color adjustment parameters parameter;

S10. Calculate the u'v' color coordinate in the CIE1976-u'v' system according to the set abscissa, and use the u'v' color coordinate as the intersection point of the blackbody locus line and the corresponding isotherm;

S20. According to the greenish toning parameter or the reddish toning parameter, the u'v' color coordinate and the adjustment step size of the isotherm, and calculate the target color mixing coordinate;

S30. Obtain the total value of the mixed luminance of each primary color and the corresponding luminance of each primary color according to the color coordinates of the target mixed color;

S40. Calculate and output a duty cycle according to the intrinsic maximum brightness of each primary color and the brightness corresponding to each primary color to control the light source.

Further, in step S10, the corresponding ordinate is calculated according to the set abscissa and the blackbody locus, so as to obtain the u'v' color coordinate.

Further, both the greenish toning parameter and the reddish toning parameter are the product of the toning step length and the respective adjustment levels.

Further, in step S30, when the total value of the mixed luminance of each primary color is 0, the duty cycle is kept at the previous state.

Further, in step S30, the total value of the mixed brightness of each primary color and the corresponding brightness of each primary color are obtained by bringing the target mixed color coordinates into the linear programming model, wherein the linear programming model is based on the inherent highest brightness of each primary color, the inherent color coordinates of each primary color And target mixed color coordinates are established.

Further, in step S40, the specific steps are:

The brightness corresponding to each primary color is divided by the inherent maximum brightness of each primary color to obtain a duty cycle, and the duty cycle is output as a PWM signal to control the light source.

Further, in step S00, the intrinsic maximum brightness of each primary color of the light source and the corresponding intrinsic color coordinates of the light source are acquired in a dark closed environment.

In the second aspect, the present application provides a blackbody locus and isotherm color control device, including:

The input unit is used to obtain the inherent maximum brightness of each primary color of the light source, the inherent color coordinates corresponding to each primary color, and the color adjustment parameters input by the user. red color parameter;

The signal analysis unit is used to calculate the u'v' color coordinate in the CIE1976-u'v' system according to the set abscissa, and use the u'v' color coordinate as the intersection point of the black body locus and the corresponding isotherm;

The isotherm adjustment unit is used to adjust the step length and calculate the target color mixing coordinates according to the greenish toning parameters or reddish toning parameters, u'v' color coordinates and isotherm;

A color matching operation unit, configured to obtain the total value of the mixed brightness of each primary color and the corresponding brightness of each primary color according to the target mixed color coordinates;

The output control unit is used to calculate the duty cycle according to the intrinsic maximum brightness of each primary color and the brightness corresponding to each primary color and output the output to control the light source.

In a third aspect, the present application provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the above blackbody locus and isotherm color grading control method.

In a fourth aspect, the present application provides a readable storage medium, wherein a computer program is stored in the readable storage medium, and the computer program includes program codes for controlling the process to execute the process. color control method.

The main contributions and innovations of the present invention are as follows: 1. Compared with the prior art, the coordinates of the blackbody locus corresponding to the calculated color temperature are discrete points, which is inconvenient for continuous color-grading comparison. The present invention provides precise blackbody locus coordinate expression, which can conveniently and continuously adjust light;

2. Compared with the prior art, for multi-primary-color lamps, the present invention receives the input of the abscissa of the user's blackbody locus, receives the user's color cast adjustment, and outputs the corresponding PWM-driven light source through color matching calculation, so as to realize the free adjustment of the target color on the isotherm;

3. Compared with the prior art, the present invention is implemented using the CIE1976-u'v' chromaticity diagram, which can ensure the accuracy of the isotherm and ensure that the isotherm is visually uniform when adjusted by steps ;

4. Compared with the existing technology, the present invention realizes the control method of color matching on the isotherm line, allowing users to freely color color on the isotherm line according to the scene requirements, so as to meet more light and color requirements, and the color matching operation unit is introduced into the system Brightness and chromaticity parameters of each primary color, precise closed-loop color matching.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below, so as to make other features, objects, and advantages of the application more comprehensible.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a flow chart of a method for controlling blackbody locus and isotherm color toning according to an embodiment of the present application;

Fig. 2 is a schematic diagram of the blackbody locus in the CIE1931-xy chromaticity diagram;

Fig. 3 is the CIE1976-u'v' chromaticity diagram that the present application adopts;

FIG. 4 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. Implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of this specification. Rather, they are merely examples of apparatuses and methods consistent with aspects of one or more embodiments of the present specification as recited in the appended claims.

It should be noted that in other embodiments, the steps of the corresponding methods are not necessarily performed in the order shown and described in this specification. In some other embodiments, the method may include more or less steps than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; multiple steps described in this specification may also be combined into a single step in other embodiments describe.

At present, different batches of light sources or different types of light sources with the same correlated color temperature use different BIN (binning) light sources. Light sources with different BIN (binning) will produce color cast.

Based on this, the present invention realizes the control method of color matching on the isotherm. For the multi-primary color light source, it receives the user’s color temperature input, receives the user’s color cast adjustment, and outputs the corresponding PWM-driven light source through the color matching operation, so as to realize the free adjustment of the target color on the isotherm. .

Embodiment one

Specifically, the embodiment of the present application provides a method for controlling blackbody locus and isotherm color adjustment. Specifically, referring to FIG. 1 , the method includes the following steps:

S00. Obtain the inherent maximum brightness of each primary color of the light source, the inherent color coordinates corresponding to each primary color, and the color adjustment parameters input by the user, wherein the color adjustment parameters include the set abscissa of the blackbody locus, greenish color adjustment parameters, and reddish color adjustment parameters parameter;

In this embodiment, the intrinsic maximum brightness of each primary color of the light source and the corresponding intrinsic color coordinates of the light source are acquired in a dark closed environment.

Wherein, the value ranges of the greenish toning parameter and the reddish toning parameter are both greater than 0 and less than or equal to 0.03.

S10. Calculate the u'v' color coordinate in the CIE1976-u'v' system according to the set abscissa, and use the u'v' color coordinate as the blackbody locus (f(u', v') in Fig. 3 ) and the corresponding isotherm (h(u',v') in Figure 3), see M _T in Figure 3;

In this embodiment, the most widely used CIE1931-xy chromaticity diagram in the prior art is visually uneven and inconsistent with human vision. The CIE1960-uv chromaticity diagram is visually further uniform. The CIE1976-u'v' chromaticity diagram has good visual uniformity. Therefore, this application is implemented using the CIE1976-u'v' chromaticity diagram to ensure the accuracy of the isotherm, and to ensure that the isotherm is visually uniform when adjusted in steps.

S20. According to the greenish toning parameters or reddish toning parameters, u'v' color coordinates and the adjustment step size of the isotherm, and calculate the target color mixing coordinates, see the greenish P _Tn and reddish Q _Tn in Figure 3;

S30. Obtain the total value of the mixed luminance of each primary color and the corresponding luminance of each primary color according to the color coordinates of the target mixed color;

In this embodiment, the total value of the mixed luminance of each primary color and the corresponding brightness of each primary color are obtained by bringing the target mixed color coordinates into the linear programming model, wherein the linear programming model is based on the inherent maximum brightness of each primary color, the inherent color coordinates of each primary color and The target mixed color color coordinates are established.

In this embodiment, when the total value of the mixed luminance of each primary color is 0, the duty cycle is kept at the previous state.

S40. Calculate and output a duty cycle according to the intrinsic maximum brightness of each primary color and the brightness corresponding to each primary color to control the light source.

Wherein, the brightness corresponding to each primary color is divided one by one by the intrinsic maximum brightness of each primary color to obtain a duty cycle, and the duty cycle is output as a PWM signal to control the light source.

Embodiment two

Based on the same idea, this application also proposes a blackbody locus and isotherm color adjustment control device, including:

The input unit is used to obtain the inherent maximum brightness of each primary color of the light source, the inherent color coordinates corresponding to each primary color, and the color adjustment parameters input by the user. red color parameter;

In this embodiment, the input unit is used to receive the set abscissa of the user's black body locus (by pushing the pusher on the console), and receive the user's greenish toning parameter d and reddish toning parameter d' enter;

Before signal analysis, it is also necessary to obtain the maximum brightness value of each primary color L' ₁ +L' ₂ +...+L'_m; obtain the color coordinates (u' ₁ ,v' ₁ ), (u' ₂ ,v ' ₂ ),..., (u' _m ,v' _m );

The signal analysis unit is used to calculate the u'v' color coordinate in the CIE1976-u'v' system according to the set abscissa, and use the u'v' color coordinate as the intersection point of the black body locus and the corresponding isotherm;

In this embodiment, the signal analysis unit is used to analyze the set abscissa into the corresponding color coordinate M _T (u' _T , v' _T ) on the blackbody locus line;

The analytical method is to substitute the set abscissa u' _T into the expression of the black body locus f(u', v'):

，其中（0.18＜u’＜0.41），即可计算出色坐标M_T(u'_T,v'_T)的纵坐标v'_T，然后就能够得到色坐标M_T(u'_T,v'_T)。

, where (0.18<u'<0.41), the ordinate v' _T of the excellent coordinate M _T (u' _T ,v' _T ) can be calculated, and then the color coordinate M _T (u' _T ,v' _T ) can be obtained ).

The isotherm adjustment unit is used to adjust the step length and calculate the target color mixing coordinates according to the greenish toning parameters or reddish toning parameters, u'v' color coordinates and isotherm;

In this embodiment, it is used to calculate the target color coordinates P _Tn (u' _mix , v' _mix ), where P _Tn represents the nth level adjustment at T color temperature when the greenish color tone is received, when the user's greenish color tone parameter is received When d(0<d≤0.03), use the following equation to establish:

In this embodiment, it is used to calculate the target color coordinates Q _Tn (u' _mix , v' _mix ), Q _Tn represents the nth level adjustment under T color temperature when reddish toning, when receiving the user's reddish toning parameter When d'(0<d'≤0.03), use the following equation to establish:

。

.

A color matching operation unit, configured to obtain the total value of the mixed brightness of each primary color and the corresponding brightness of each primary color according to the target mixed color coordinates;

In this embodiment, the color matching operation unit is established based on the following linear programming model for any light source of no less than three primary colors:

Objective function: max L _mix =L' ₁ +L' ₂ +...+L' _m

Among them, the subscript m is a positive integer not less than 3, indicating the number of primary colors; L' ₁ , L' ₂ , ..., L' _m are the undetermined target brightness of each primary color, which belongs to the decision variable; L _mix is the undetermined total brightness of mixed colors ; L ₁ , L ₂ ,..., L _m are the inherent maximum brightness of each primary color; (u' _mix , v' _mix ) is the color coordinate of the target mixed color; (u' ₁ , v' ₁ ), ( u' ₂ ,v' ₂ ), ..., (u' _m ,v' _m ) are the inherent color coordinates of each primary color.

Among them, when the optimal solution L _mix of the linear programming model =0, it means that the target color coordinate P _Tn (u' _mix , v' _mix ) determined by the user input parameters is not within the color gamut composed of m primary colors, at this time The operation to be performed is: keep the output of the duty cycle D in the previous state; it can also return information prompts at the same time.

The output control unit is used to calculate the duty cycle according to the intrinsic maximum brightness of each primary color and the brightness corresponding to each primary color and output the output to control the light source.

Among them, the duty cycle is recorded as D:

Among them, L' ₁ , L' ₂ , ..., L' _m are the brightness of each primary color matching result, and L ₁ , L ₂ , ..., L _m are the intrinsic maximum brightness of each primary color.

Embodiment three

Based on Embodiment 1 or Embodiment 2, in this embodiment, a certain 4-primary color RGBW (red, green, blue, white) lamp is placed in a dark room, and the maximum brightness of each primary color is measured as:

L _R =850; L _G =2500; L _B =450; L _W =2050.

At the same time, the color coordinates of each primary color are measured, which are recorded as:

u' _R =0.5442, v' _R =0.5180;

u' _G =0.0553, v' _G =0.5715;

u' _B =0.1691, v' _B =0.1241;

u'W =0.1702, _v'W = _0.4133 ;

At this time, for example, the user operates the color adjustment of the light source, pushes the slide bar on the console to input and set the abscissa u' _T =0.1996, and calculates the corresponding ordinate V' _T according to the black body locus expression in the second embodiment:

The u'v' color coordinates in the CIE1976-u'v' system are obtained as M _T (u' _T ,v' _T )=(0.1996,0.4639). This point is the intersection of the blackbody locus and the corresponding isotherm.

Set the color step size on the isotherm line as λ=0.002, when inputting 1-level adjustment on the greenish channel, that is, d=1×λ=0.002, record the target mixing color node as P _T-1 (u' _mix ,v' _mix ).

Substituting the value of (u' _T , v' _T ) and the value of d into the following equation, the target color mixing coordinate P _T-1 (u' _mix , v' _mix ) can be solved:

The solution is P _T-1 (u' _mix , v' _mix )=(0.1978,0.4646), which is the target color mixing coordinates.

Substitute the above data into the following linear programming model:

Objective function: max L _mix = L' _R + L' _G + L' _B + L' _w

Substituting the data to solve the model, the mixed brightness has a maximum value L _mix =L' _R +L' _G +L' _B +L' _w =4634.517. At this time, the brightness of each primary color of RGBW is: L' _R =850; L' _G =1680.737; L' _B =53.780; L' _W =2050.

Then get the duty ratio D of PWM at this time:

Based on the above process, the user adjusts the color of the light source, pushes the slider on the console to input and set the abscissa u' _T =0.1996, and enters the adjustment level as 1 in the greenish channel. The color matching operation unit returns the PWM duty cycle, that is, the PWM signal duty cycle of each primary color of RGBW is output as D={1,0.6723,0.1195,1} and sent to the driver to drive each primary color of the light source to emit light and mix colors as required. The color temperature after grading is still the color temperature corresponding to the current point _MT on the black body locus line, but it is shifted to the green direction by 1 level.

Embodiment Four

On the basis of Embodiment 3, when the user inputs 2-level adjustment on the greenish channel, d=2×λ=0.004, at this time, use the same formula as Embodiment 4 to obtain the target color mixing coordinates PT _-2 (u' _mix ,v' _mix )=( 0.1960,0.4654);

The maximum value of mixed brightness L _mix =L' _R +L' _G +L' _B +L' _w =4707.677

The brightness of each primary color of RGBW is: L' _R =850; L' _G =1751.990; L' _B =55.688; L' _W =2050;

The final duty cycle D={1,0.7008,0.1238,1}.

Based on the above process, the user adjusts the color of the light source, pushes the slider on the console to input and set the abscissa u' _T =0.1996, and enters the adjustment level as 2 in the greenish channel. The color matching calculation unit returns the PWM duty cycle, that is, the PWM signal duty cycle of each primary color of RGBW is output as D={1,0.7008,0.1238,1} and sent to the driver to drive each primary color of the light source to emit light and mix colors as required. The color temperature after grading is still the color temperature corresponding to the current point _MT on the black body locus line, but it is shifted to the green direction by 2 levels.

Embodiment five

On the basis of Example 3, when the user enters level 1 adjustment on the reddish channel (at this time, the previous greenish adjustment data will be overwritten), that is, d'=1×λ=0.002, the coordinates of the target color mixing are Q _{T- 1} (u' _mix ,v' _mix ).

Using the same formula in Example 3, substituting the value of (u' _T , v' _T ) and the value of d' into the following equation, the target color mixing coordinate Q _T-1 (u' _mix , v' _mix ) can be solved:

Get Q _T-1 (u' _mix ,v' _mix )=( 0.2014,0.4629), which is the target color mixing coordinates.

Substitute Q _T-1 (u' _mix ,v' _mix ) into the linear programming model:

Objective function: max L _mix = L' _R + L' _G + L' _B + L' _w

Substituting the data to solve the model, the mixed brightness has a maximum value L _mix =L' _R +L' _G +L' _B +L' _w =4494.104. At this time, the brightness of each primary color of RGBW is: L' _R =850; L' _G =1543.654; L' _B =50.450; L' _W =2050;

Then get the duty ratio D of PWM at this time:

Based on the above process, the user adjusts the color of the light source, pushes the slider on the console to input and set the abscissa u' _T =0.1996, and enters the adjustment level as 1 in the reddish channel. The color matching operation unit returns the PWM duty cycle, that is, the PWM signal duty cycle output of each RGBW primary color is D={1, 0.6175 , 0.1121 , 1} and sent to the driver to drive each primary color of the light source to emit light and mix colors as required. The color temperature after grading is still the color temperature corresponding to the current point _MT on the black body locus line, but it is shifted to the red direction by 1 level.

Embodiment six

The operation is the same as that in Embodiment 5, except that in this embodiment, when the user inputs 2 levels of adjustment on the reddish channel, that is, d'=2×λ=0.004. At this point, get Q _T-2 (u' _mix ,v' _mix )=(0.2032,0.4621)

The maximum value of mixed brightness L _mix =L' _R +L' _G +L' _B +L' _w =4425.251;

The brightness of each primary color of RGBW is: L' _R =850; L' _G =1476.692; L' _B =48.559; L' _W =2050;

Final duty cycle D={1, 0.5907, 0.1079, 1}

Based on the above process, the user adjusts the color of the light source, pushes the slider on the console to input and set the abscissa u' _T =0.1996, and enters the adjustment level as 2 in the reddish channel. The color matching calculation unit returns the PWM duty cycle, that is, the PWM signal duty cycle of each primary color of RGBW is output as D={1, 0.5907, 0.1079, 1} and sent to the driver to drive each primary color of the light source to emit light and mix colors as required. The color temperature after grading is still the color temperature corresponding to the current point _MT on the black body locus line, but it is shifted to the red direction by 2 levels.

Embodiment seven

This embodiment also provides an electronic device, referring to FIG. 4 , including a memory 404 and a processor 402, the memory 404 stores a computer program, and the processor 402 is configured to run the computer program to perform any one of the methods described above. steps in the example.

Specifically, the processor 402 may include a central processing unit (CPU), or an Application Specific Integrated Circuit (ASIC for short), or may be configured to implement one or more integrated circuits in the embodiments of the present application.

Wherein, the memory 404 may include a mass memory 404 for data or instructions. For example without limitation, the memory 404 may include a hard disk drive (HardDiskDrive, referred to as HDD), a floppy disk drive, a solid state drive (SolidStateDrive, referred to as SSD), flash memory, optical disk, magneto-optical disk, tape or Universal Serial Bus (UniversalSerialBus, abbreviated as USB) drive or a combination of two or more of the above. Storage 404 may include removable or non-removable (or fixed) media, where appropriate. Memory 404 may be internal or external to the data processing arrangement, where appropriate. In a particular embodiment, memory 404 is a non-volatile (Non-Volatile) memory. In a specific embodiment, the memory 404 includes a read-only memory (Read-Only Memory, ROM for short) and a random access memory (Random Access Memory, RAM for short). In appropriate cases, the ROM can be mask programmed ROM, programmable ROM (Programmable Read-Only Memory, referred to as PROM), erasable PROM (Erasable Programmable Read-Only Memory, referred to as EPROM), electrically erasable PROM (Electrically Erasable Programmable Read -OnlyMemory, referred to as EEPROM), electrically rewritable ROM (Electrically Alterable Read-OnlyMemory, referred to as EAROM) or flash memory (FLASH) or a combination of two or more of these. In appropriate cases, the RAM can be a static random access memory (Static Random-Access Memory, referred to as SRAM) or a dynamic random access memory (Dynamic Random Access Memory, referred to as DRAM), where the DRAM can be a fast page mode dynamic random access Memory 404 (FastPageModeDynamicRandomAccessMemory, referred to as FPMDRAM), extended data output dynamic random access memory (ExtendedDateOutDynamicRandomAccessMemory, referred to as EDODRAM), synchronous dynamic random access memory (SynchronousDynamicRandom-AccessMemory, referred to as SDRAM), etc.

The memory 404 may be used to store or cache various data files required for processing or communication, as well as possible computer program instructions executed by the processor 402 .

The processor 402 reads and executes the computer program instructions stored in the memory 404 to implement any blackbody locus and isotherm line toning control method in the above-mentioned embodiments.

Optionally, the above-mentioned electronic device may further include a transmission device 406 and an input-output device 408 , wherein the transmission device 406 is connected to the above-mentioned processor 402 , and the above-mentioned input-output device 408 is connected to the above-mentioned processor 402 .

Transmission device 406 may be used to receive or transmit data via a network. The specific example of the above network may include a wired or wireless network provided by the communication provider of the electronic device. In one example, the transmission device includes a network adapter (Network Interface Controller, NIC for short), which can be connected to other network devices through a base station so as to communicate with the Internet. In an example, the transmission device 406 may be a radio frequency (Radio Frequency, RF for short) module, which is used to communicate with the Internet in a wireless manner.

Input and output devices 408 are used to input or output information. In this embodiment, the input information may be color adjustment parameters and the like, and the output information may be duty cycle and the like.

Embodiment Four

This embodiment also provides a readable storage medium, and a computer program is stored in the readable storage medium. The computer program includes program codes for controlling the process to execute the process. The process includes the black body locus and isotherm adjustment according to the first embodiment. color control method.

It should be noted that, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details will not be repeated in this embodiment.

In general, the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. Although various aspects of the present invention may be shown and described as block diagrams, flowcharts, or using some other graphical representation, it should be understood that, as non-limiting examples, these blocks, devices, systems, techniques or methods described herein may be presented in hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof.

Embodiments of the invention may be implemented by computer software executable by a data processor of a mobile device, such as in a processor entity, or by hardware, or by a combination of software and hardware. Computer software or programs (also referred to as program products), including software routines, applets or macros, can be stored on any device-readable data storage medium and they include program instructions for performing certain tasks. A computer program product may include one or more computer-executable components configured to perform an embodiment when the program is run. One or more computer-executable components may be at least one software code or a portion thereof. Also in this regard, it should be noted that any blocks of the logic flow in the figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. Software may be stored on physical media such as memory chips or memory blocks implemented within the processor, magnetic media such as hard or floppy disks, and optical media such as eg DVD and its data variants, CD. Physical media are non-transient media.

Those skilled in the art should understand that the various technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, all possible combinations of the various technical features in the above embodiments are not described. There is no contradiction in the combination, and all should be considered as within the scope of the description.

The above examples only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be determined by the appended claims.

Claims (9)

1. The black body track and isothermal line color modulation control method is characterized by comprising the following steps of:

s00, obtaining inherent maximum brightness of each primary color of a light source, inherent color coordinates corresponding to each primary color and color mixing parameters input by a user, wherein the color mixing parameters comprise a set abscissa, a greenish color mixing parameter and a reddish color mixing parameter of a black body trajectory;

s10, calculating a u 'v' color coordinate in a CIE1976-u 'v' system according to a set abscissa, and taking the u 'v' color coordinate as an intersection point of a black body trajectory line and a corresponding isotherm;

s20, calculating a target mixed color coordinate according to a greenish color mixing parameter or a reddish color mixing parameter, a u 'v' color coordinate and an adjustment step length of an isothermal line;

s30, substituting the target mixed color coordinate into a linear programming model to obtain a total value of mixed brightness of each primary color and brightness corresponding to each primary color, wherein the linear programming model is established based on the inherent highest brightness of each primary color, the inherent color coordinate of each primary color and the target mixed color coordinate;

and S40, calculating a duty ratio according to the inherent highest brightness of each primary color and the brightness corresponding to each primary color and outputting to control the light source.

2. The method as claimed in claim 1, wherein in step S10, the corresponding ordinate is calculated according to the set abscissa and the black body locus, so as to obtain the u 'v' chromaticity coordinates.

3. The black body locus and isotherm toning control method of claim 1, wherein the greenish toning parameter and the reddish toning parameter are both the product of a toning step size and a respective adjustment level.

4. The black body locus and isotherm toning method of claim 1, wherein in step S30, when the total value of the mixed brightness of the primary colors is 0, the duty ratio is maintained in the last state.

5. The black body locus and isotherm toning control method of claim 4, wherein in step S40, the specific steps are:

and dividing the brightness corresponding to each primary color by the inherent highest brightness of each primary color to obtain a duty ratio, and outputting the duty ratio as a PWM signal to control the light source.

6. The black body locus and isotherm toning control method of claim 1, wherein in step S00, the inherent maximum brightness of each primary color of the light source and the corresponding inherent color coordinates are obtained in a dark enclosed environment.

7. The utility model provides a black body orbit and isotherm mixing of colors controlling means which characterized in that includes:

the input unit is used for acquiring inherent maximum brightness of each primary color of the light source, inherent color coordinates corresponding to each primary color and color mixing parameters input by a user, wherein the color mixing parameters comprise a set abscissa, a greenish color mixing parameter and a reddish color mixing parameter of a black body trajectory;

the signal analysis unit is used for calculating a u 'v' color coordinate in a CIE1976-u 'v' system according to a set abscissa, and taking the u 'v' color coordinate as an intersection point of a black body trajectory line and a corresponding isotherm;

the isothermal line adjusting unit is used for calculating a target mixed color coordinate according to the greenish color matching parameter or the reddish color matching parameter, the u 'v' color coordinate and the adjusting step length of the isothermal line;

the color matching operation unit is used for obtaining the total value of the mixed brightness of each primary color and the brightness corresponding to each primary color by substituting the target mixed color coordinate into a linear programming model, wherein the linear programming model is established based on the inherent highest brightness of each primary color, the inherent color coordinate of each primary color and the target mixed color coordinate;

and the output control unit is used for calculating the duty ratio according to the inherent highest brightness of each primary color and the brightness corresponding to each primary color and outputting to control the light source.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the black body locus and isotherm toning control method of any one of claims 1 to 6.

9. A readable storage medium having stored therein a computer program comprising program code for controlling a process to execute a process, the process comprising the black body locus and isotherm toning control method according to any one of claims 1 to 6.

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