CN111741559B - Color temperature correction method, system, control terminal and computer readable storage medium - Google Patents

Color temperature correction method, system, control terminal and computer readable storage medium Download PDF

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CN111741559B
CN111741559B CN202010876438.1A CN202010876438A CN111741559B CN 111741559 B CN111741559 B CN 111741559B CN 202010876438 A CN202010876438 A CN 202010876438A CN 111741559 B CN111741559 B CN 111741559B
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color temperature
combination
compensation values
led
brightness
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CN111741559A (en
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张云
李传福
叶建胜
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Jiangxi Jiajie Xinyuan Science And Technology Co ltd
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Jiangxi Jiajie Xinyuan Science And Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits

Abstract

A color temperature correction method, a system, a control terminal and a computer readable storage medium, the color temperature correction method includes: controlling the LED lamps to emit light by LEDs with different colors respectively, and acquiring chromaticity coordinates of the LEDs with corresponding colors; receiving control information corresponding to the target color temperature, and controlling the LED lamp to be lightened according to the control information; acquiring a tristimulus value of the actual color temperature of the lighted LED lamp and acquiring a tristimulus value of a target color temperature; determining a combination of various brightness compensation values of the LEDs participating in the mixed light according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature and chromaticity coordinates of the LEDs participating in the mixed light; determining an optimal combination according to a preset screening rule; determining correction information of driving signals corresponding to LEDs of all colors participating in light mixing according to the optimal combination; and sending the correction information to the LED lamp so that the LED lamp performs color temperature correction according to the correction information. The method is convenient to operate and high in correction efficiency.

Description

Color temperature correction method, system, control terminal and computer readable storage medium
Technical Field
The invention relates to the technical field of LED lamp illumination, in particular to a color temperature correction method, a color temperature correction system, a control terminal and a computer readable storage medium.
Background
The LED illuminating lamp has the advantages of high luminous efficiency, good directivity, low energy efficiency, long service life, good reliability, safety, environmental protection and the like, and is popular to people. With the development of intelligent LED lighting technology, the performance requirements for products are also higher and higher.
Color temperature colo (u) r temperature, which represents the most common indicator of the spectral quality of a light source, affects the perception of the light by the human eye. The color temperature accuracy and consistency of the color temperature adjustable LED reflect the quality of LED lighting products to a certain extent. In the prior art, an LED lighting fixture with adjustable color temperature is generally composed of a plurality of LED light emitting chips, and white light with different color temperatures is mixed by changing the light emitting ratio of each path of LED light emitting chip.
Due to the production process of the LED light-emitting chip, the LED light-emitting chip has deviation of light-emitting color, so that the color temperature of the mixed light with the color is deviated, and uncomfortable use experience is brought to people.
Disclosure of Invention
In view of the above, there is a need to provide a color temperature correction method, system, control terminal and computer readable storage medium to solve the problem of color temperature deviation of LED lamp in the prior art.
A color temperature correction method is applied to an LED lamp, the LED lamp comprises LEDs with multiple colors, and the color temperature correction method comprises the following steps:
controlling the LED lamps to emit light by LEDs with different colors respectively, and acquiring chromaticity coordinates of the LEDs with corresponding colors;
receiving control information corresponding to a target color temperature, and controlling the LED lamp to be turned on according to the control information;
acquiring a tristimulus value of the actual color temperature of the lighted LED lamp and acquiring a tristimulus value of the target color temperature;
determining a combination of various brightness compensation values of the LEDs participating in the mixed light according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature and the chromaticity coordinates of the LEDs participating in the mixed light;
determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule;
determining correction information of driving signals corresponding to the LEDs of all colors participating in light mixing according to the optimal combination;
and sending the correction information to the LED lamp so as to enable the LED lamp to correct the color temperature according to the correction information.
Further, in some embodiments, the method for correcting color temperature, wherein the determining an optimal combination for correcting color temperature from a plurality of combinations of the luminance compensation values according to a preset filtering rule includes:
and selecting a combination with the minimum sum of the brightness compensation values from a plurality of combinations of the brightness compensation values as an optimal combination of the brightness compensation values for correcting the color temperature.
In some embodiments, the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset filtering rule includes:
and selecting the combination with the least compensated color types from the combinations of the brightness compensation values as the optimal combination of the brightness compensation values for correcting the color temperature.
In some embodiments, after the step of controlling the LED lamps to emit light with LEDs of different colors, the color temperature correction method further includes:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting at least one alternative combination from the combinations of the brightness compensation values according to the combinations of the maximum brightness value and the brightness compensation values; and selecting the combination with the minimum sum of the brightness compensation values from the alternative combinations, and/or selecting the combination with the minimum compensation color type as the optimal combination of the brightness compensation values for correcting the color temperature.
In some embodiments, the selecting at least one alternative combination from the combinations of the brightness compensation values according to the combination of the maximum brightness value and the brightness compensation values includes:
respectively carrying out compensation calculation according to the combination of the various brightness compensation values, and determining various compensated LED brightness value combinations;
selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the alternative combination.
In some embodiments, after the step of controlling the LED lamps to emit light with LEDs of different colors, the color temperature correction method further includes:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting a combination with the sum of the brightness compensation values smaller than a first preset threshold value from the multiple combinations of the brightness compensation values as an alternative combination, or selecting a combination with the number of the compensated color types smaller than a second preset threshold value as an alternative combination;
and selecting the optimal combination of the brightness compensation values for correcting the color temperature from the alternative combinations according to the maximum brightness value and the alternative combinations.
In some embodiments of the above color temperature correction method, the selecting an optimal combination of the luminance compensation values for correcting color temperature from the candidate combinations according to the maximum luminance value and the candidate combinations includes:
respectively carrying out compensation calculation according to the alternative combinations, and determining various compensated LED brightness value combinations;
selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the optimal combination.
The embodiment of the invention also provides a color temperature correction system, which is applied to an LED lamp, wherein the LED lamp comprises LEDs with various colors,
the lamp tray is used for bearing the LED lamp;
the acquisition device is used for acquiring the luminous chromaticity coordinates and/or the luminance of the LED lamp;
the control terminal is used for controlling the acquisition device and the LED lamp and can realize the method as described in any one of the above methods:
the embodiment of the invention also provides a control terminal, which comprises a memory and a processor, wherein the memory stores programs, and the programs realize any one of the methods when being executed by the processor.
An embodiment of the present invention further provides a computer-readable storage medium, on which a program is stored, where the program is executed by a processor to implement any of the above methods.
In this embodiment, the combination of the luminance compensation values of the LEDs of each color participating in the mixed light is determined by the tristimulus value of the actual color temperature, the tristimulus value of the target color temperature, and the chromaticity coordinates of the LEDs of each color participating in the mixed light, and then the optimal combination of the luminance compensation values for correcting the color temperature is determined according to the preset screening rule. And determining correction information of the driving signals corresponding to the LEDs of all colors participating in light mixing according to the optimal combination. And the LED lamp corrects the color temperature according to the correction information, so that the problem of color temperature deviation is solved. The method determines the brightness compensation values of the LEDs of all colors participating in light mixing according to the tristimulus values, further obtains the correction information of the driving signals, and is high in correction accuracy and correction efficiency.
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FIG. 1 is a flowchart illustrating a method for correcting color temperature according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the positions of measured color temperatures and target color temperatures in a CIE chromaticity diagram;
FIG. 3 is a flowchart illustrating a color temperature calibration method according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for selecting an optimal combination from a plurality of combinations of luminance compensation values according to a second embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for selecting an optimal combination from a plurality of combinations of luminance compensation values according to a third embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for selecting an optimal combination from a plurality of combinations of luminance compensation values according to a fourth embodiment of the present invention;
FIG. 7 is a flowchart illustrating a method for selecting an optimal combination from a plurality of combinations of illumination compensation values according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a color temperature correction system according to a fifth embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Referring to fig. 1, a color temperature calibration method according to a first embodiment of the present invention is used for performing color temperature calibration on an LED lamp, where the LED lamp includes LEDs with multiple colors. For example, the LED lamp may be composed of two or more LEDs of red, blue, green, and white LEDs. The LED lamp of each color emits light of a single color, and white light of different color temperatures can be mixed by adjusting the luminous flux of the LEDs of different colors. The color temperature correction method in the embodiment of the application is used for correcting the color temperature of the produced LED lamp, so that the actual color temperature of the LED lamp is consistent with the set target color temperature. Specifically, the color temperature correction method includes steps S11-S17.
And step S11, controlling the LED lamps to emit light by the LEDs with different colors respectively, and acquiring chromaticity coordinates of the LEDs with corresponding colors.
In this embodiment, the LED lamps of the colors participating in light mixing in the LED lamp are controlled to be sequentially turned on, and chromaticity coordinates of light of the corresponding color are collected. The chromaticity coordinates mentioned in the present embodiment are based on color coordinates in the CIE color model, in which a given visual stimulus can be characterized by a luminance parameter Y and two chromaticity coordinates x and Y. From the chromaticity coordinates, a point can be determined on the chromaticity diagram, which point accurately represents the emission color.
And step S12, receiving control information corresponding to the target color temperature, and controlling the LED lamp to be turned on according to the control information.
The control information at least comprises a color temperature value to be corrected and a corresponding control instruction, and can be sent by a trigger button on an operation interface of a user or automatically sent by a set program. When control information of a target color temperature is received, a corresponding control instruction is sent to the LED lamp, and the LED lamp is turned on at the target color temperature according to the control instruction, in some embodiments, the target color temperature may be 6000K, and a software program corresponding to starting the color temperature of 6000K is prestored in the lamp, and the software program is used to control the IC to output a driving signal to each color LED participating in light mixing, so that each color LED can emit light according to the corresponding driving signal and mix the target color temperature.
It can be understood that, in an embodiment of the present invention, the control information may further include ID information of the LED lamp, and the corresponding LED lamp can be identified according to the ID information, that is, the control information may be interacted with the plurality of LED lamps at the same time, so as to implement simultaneous correction of color temperatures of the plurality of LED lamps.
And step S13, acquiring the tristimulus value of the actual color temperature of the lighted LED lamp and acquiring the tristimulus value of the target color temperature.
Due to the production process of the LED light emitting chip, the LED light emitting chip has a deviation of the light emitting color, so that the actual color temperature mixed after the LED lamp is turned on may not be the same as the set target color temperature, and therefore, the actual color temperature of the LED lamp needs to be corrected. In specific implementation, the tristimulus values of the actual color temperature and the target color temperature after the LED lamp is lightened are obtained. The tristimulus values and the chromaticity coordinates and the brightness of the luminescent colors in the CIE chromaticity diagram have a certain transformation relation, and the corresponding tristimulus values can be calculated through the chromaticity coordinates and the brightness of the colors.
Therefore, the tristimulus value of the actual color temperature T can be obtained according to the actual chromaticity coordinate (x) of the actual luminous color of the LED lampt，yt) And the actual luminance YtTo determine, i.e. the tristimulus value (X) of the actual color temperature TT，YT，ZT) The calculation formula of (a) is as follows:
Figure 782111DEST_PATH_IMAGE001
the tristimulus value of the target color temperature can be determined by the target chromaticity coordinate (x) of the target color temperature Aa，ya) And a target luminance YaCalculated, wherein the target chromaticity coordinate (x)a，ya) And a target luminance YaIs a known quantity, so that the tristimulus value (X) of the target color temperature A can be calculated according to the transformation relation between the chromaticity coordinate and the brightness and the tristimulus valueA，YA，ZA) The calculation formula is as follows:
Figure 244316DEST_PATH_IMAGE002
step S14, obtaining a combination of multiple luminance compensation values of the LEDs participating in the light mixing according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature, and the chromaticity coordinates of the LEDs of each color participating in the light mixing.
And step S15, according to the preset screening rule, determining the optimal combination for correcting the color temperature from the combination of the brightness compensation values.
And step S16, determining the correction information of the driving signals corresponding to the LEDs of each color participating in the light mixing according to the optimal combination.
According to the tristimulus values of the actual color temperature and the target color temperature, the difference value of each stimulus value can be respectively calculated, namely X is respectivelyd，Yd，ZdThe difference between the three stimulus values is calculated as follows:
Xd=XA-XT；
Yd=YA-YT；
Zd=ZA-ZT。
the compensation value of each stimulus value can be determined according to the difference value, and according to the color superposition principle, the compensation of each stimulus value is equal to the sum of the compensation values of the stimulus values corresponding to the LEDs of all colors. Taking red light LED, green light LED, blue light LED and white light LED as an example to participate in light mixing, the compensation value formula of the tristimulus values of the LEDs of all colors is as follows:
Figure 467487DEST_PATH_IMAGE003
Figure 922608DEST_PATH_IMAGE004
Figure 711573DEST_PATH_IMAGE005
wherein, Xr、Yr、ZrA compensation value for the tristimulus value of the red LED; xg、Yg、ZgCompensation value of tristimulus value of green light LED; xb、Yb、ZbA compensation value for the tristimulus value of the blue LED; xw、Yw、ZwIs the compensation value of the tristimulus value of the white light LED.
And calculating various combinations of the brightness compensation values of the colors according to the relationship among the tristimulus values, the chromaticity coordinates and the brightness, and determining the optimal combination of the brightness compensation values for correcting the color temperature in the various combinations of the brightness compensation values according to a preset screening rule. Wherein the screening rule includes but is not limited to at least one of the following:
and firstly, selecting the combination with the minimum sum of the brightness compensation values. That is, the sum of the luminance compensation values of the respective colors in the respective combinations of the luminance compensation values is compared, and a combination in which the sum of the luminance compensation values is the smallest is determined as an optimal combination of the luminance compensation values for correcting the color temperature.
And secondly, selecting the combination with the least compensated color types. That is, the number of kinds of colors to be compensated in each combination of the luminance compensation values is compared, and a combination having the smallest kind of colors is determined as an optimal combination of the luminance compensation values for correcting the color temperature.
Specifically, since the chromaticity coordinates of the LEDs of each color are fixed, the tristimulus values of the LEDs of each color participating in the light mixing can be adjusted by adjusting the emission luminance of the LEDs of each color participating in the light mixing according to the relationship between the tristimulus values and the chromaticity coordinates and the luminance.
In the LED lamp, the luminance of the LEDs of the corresponding color is generally controlled by each driving signal, and the luminance of the LEDs of the corresponding color can be changed by adjusting the driving signal of each color, so that the correction information of the driving signal is finally determined according to the variation of the luminance of the LEDs of each color.
For example, as shown in fig. 2, the measured color temperature of 6000K of the current bulb is deviated, and the detected actual color temperature of the LED lamp is lower than the target color temperature, which indicates that the red light component in the mixed light is too high and the green light and the blue light are lacked, so that the brightness of the red light can be reduced, and the brightness of the green light and/or the blue light can be increased. The color temperature coordinate position of the bulb is shifted in the directions of G and B, and the chromaticity coordinate with the deviation can be adjusted to the target chromaticity coordinate position of "6000K" in the figure, and the other color temperature corrections are based on the same principle.
And step S17, sending the correction information to the LED lamp, so that the LED lamp can correct the color temperature according to the correction information.
And sending the correction information to an LED lamp, and correcting the color temperature of the LED lamp according to the correction information. In specific implementation, the LED lamp is at least provided with one color temperature control, and when the LED lamp has multiple color temperatures, each color temperature of the LED lamp can be corrected in sequence according to the method.
In this embodiment, the combination of the luminance compensation values of the LEDs of each color participating in the mixed light is determined by the tristimulus value of the actual color temperature, the tristimulus value of the target color temperature, and the chromaticity coordinates of the LEDs of each color participating in the mixed light, and then the optimal combination of the luminance compensation values for correcting the color temperature is determined according to the preset screening rule. And determining correction information of the driving signals corresponding to the LEDs of all colors participating in light mixing according to the optimal combination. And the LED lamp corrects the color temperature according to the correction information, so that the problem of color temperature deviation is solved. The method determines the brightness compensation values of the LEDs of all colors participating in light mixing according to the tristimulus values, further obtains the correction information of the driving signals, and is high in correction accuracy and correction efficiency.
Referring to FIG. 3, a color temperature calibration method according to a second embodiment of the present invention includes steps S21-S28.
And step S21, controlling the LED lamps to emit light by the LEDs with different colors respectively, and acquiring the chromaticity coordinates and the maximum brightness values of the LEDs with corresponding colors.
The present embodiment takes the color temperature correction of an LED lamp including four color LEDs as an example to illustrate the inventive concept and the implementation principle of the present application, wherein the four color LEDs are red R, green G, blue B and white W, respectively. The LEDs of four colors of red, green, blue and white participate in light mixing, and white light with different color temperatures is obtained by regulating and controlling driving signals of the LEDs of all colors.
Controlling the LED lamp to respectively light the LEDs with four colors, and acquiring the chromaticity coordinate and the brightness of each color to obtain that the chromaticity coordinates of the LEDs with four colors are respectively R (x)r，yr)、G(xg，yg)、B(xb，yb) And W (x)w，yw) The brightness of the red LED, the green LED, the blue LED and the white LED is Yrmax、Ygmax、YbmaxAnd YwmaxI.e. the maximum brightness value of the four color LEDs. In the specific implementation, the chromaticity coordinate and the brightness can be collected by a colorimeter.
And step S22, receiving control information corresponding to the target color temperature, and controlling the LED lamp to be turned on according to the control information.
And when control information of a target color temperature is received, sending a corresponding control instruction to the LED lamp, and lighting the LED lamp with the target color temperature according to the control instruction.
Step S23, acquiring the actual chromaticity coordinate and the actual brightness of the actual color temperature of the lighted LED lamp, and determining the tristimulus value of the actual color temperature according to the actual chromaticity coordinate and the actual brightness.
Wherein the tristimulus value (X) of the actual color temperature TT，YT，ZT) Is calculated byThe formula is as follows:
Figure 610258DEST_PATH_IMAGE006
wherein x istAnd ytAs the actual chromaticity coordinate, YtIs the actual brightness.
Step S24, obtaining a target chromaticity coordinate and a target brightness of the target color temperature, and determining a tristimulus value of the target color temperature according to the target chromaticity coordinate and the target brightness.
In particular, the tristimulus value (X) of the target color temperature AA，YA，ZA) The calculation formula is as follows:
Figure 320726DEST_PATH_IMAGE007
wherein, x isaAnd yaIs the target chromaticity coordinate, YaIs the target brightness.
Step S25, determining a combination of multiple luminance compensation values of the LEDs participating in the light mixing according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature, and the chromaticity coordinates of the LEDs of each color participating in the light mixing.
And step S26, according to the preset screening rule, determining the optimal combination for correcting the color temperature from the combination of the brightness compensation values.
And step S27, determining the correction information of the driving signals corresponding to the LEDs of each color participating in the light mixing according to the optimal combination.
The difference between the tristimulus value of the target color temperature and the tristimulus value of the actual color temperature is calculated as follows:
Xd=XA-XT；
Yd=YA-YT；
Zd=ZA-ZT；
wherein, Xd、YdAnd ZdRespectively, the difference value of the three stimulus values is threeCompensation value of seed stimulus value.
According to the color superposition principle, the compensation value of the tristimulus value is the sum of the compensation values of the four color lights, namely:
Figure 64691DEST_PATH_IMAGE008
wherein, Xr，YrAnd ZrThree stimulus compensation values for red LED, Xg，YgAnd ZgThree stimulus compensation values for green LEDs, Xb，YbAnd ZbThree stimulus compensation values for blue LED, Xw，YwAnd ZwIs the tri-stimulus compensation value of the white LED.
Again, based on the relationship between the tristimulus values and the chromaticity coordinates and luminance, the above equations (1) to (3) can be converted into:
Figure 426271DEST_PATH_IMAGE009
in the above three equation sets (4) to (6),
Figure 964699DEST_PATH_IMAGE010
luminance compensation values of the red LED, the green LED, the blue LED, and the white LED, respectively, wherein:
Figure 162463DEST_PATH_IMAGE011
wherein the content of the first and second substances,
Figure 710119DEST_PATH_IMAGE012
the brightness components of the red LED, the green LED, the blue LED and the white LED under the actual color temperature are respectively realized by driving through driving signals under the actual color temperature of the LEDs of all colors in the LED lamp;
Figure 920346DEST_PATH_IMAGE013
are respectively target colorAnd at the temperature, brightness components of the red LED, the green LED, the blue LED and the white LED are required to reach the brightness of the LEDs of all colors when the target color temperature is reached.
The solutions of the brightness compensation values of the four color lights calculated according to the formulas (1) to (10) are not unique, that is, combinations of a plurality of brightness compensation values are obtained, and then an optimal combination is selected from the combinations of the plurality of brightness compensation values according to a preset screening rule.
In some embodiments of the present invention, the preset filtering rule may be based on energy consumption consideration in the correction process, and select a combination with the lowest energy consumption, that is, the smallest sum of the luminance compensation values, or based on control operation convenience consideration of software, select a combination with the smallest compensation color type, or select an optimal combination in consideration of both energy consumption and control operation convenience of software. In addition, the preset screening rule also takes into account the definition condition of the maximum value of the brightness of the LEDs of each color. Specifically, as shown in fig. 4, in the present embodiment, the step of selecting an optimal combination from the combinations of the plurality of luminance compensation values includes:
step S2611, carry on the compensation calculation according to the combination of the multiple luminance compensation value separately, confirm the LED luminance value combination after the multiple compensation;
step S2612, choose the LED brightness value combination that the brightness value of every color LED in the combination does not exceed the corresponding maximum brightness value;
step S2613, combining the brightness compensation values corresponding to the selected LED brightness value combinations into the candidate combinations;
step S2614, selecting a combination with the minimum sum of luminance compensation values from the candidate combinations as an optimal combination of the luminance compensation values for correcting color temperature.
And according to the multiple groups of brightness compensation values obtained by the equation calculation, compensation calculation is respectively carried out according to the combination of multiple brightness compensation values, the LED brightness value combination after multiple kinds of compensation is determined, and the LED brightness value combination with the brightness value of each color LED in the combination not exceeding the corresponding maximum brightness value is selected.
The adjustable brightness of the LEDs of each color is limited by the maximum brightness value of the LEDs of the corresponding color, i.e., the brightness of the LEDs of each color at the target color temperature satisfies the following formula:
Figure 160834DEST_PATH_IMAGE014
the luminance compensation value combinations corresponding to the LED luminance value combinations selected according to the above-described limiting conditions (11) to (14) are set as candidate combinations, and a combination with the smallest sum of the luminance compensation values in the candidate combinations is determined as an optimal combination of the luminance compensation values for correcting the color temperature. For example, when the detected actual color temperature of the LED lamp is 5950K, which is 50K lower than the target color temperature of 6000K, the brightness compensation value calculated according to the above formula
Figure 580314DEST_PATH_IMAGE015
There are four groups of alternative combinations of (a), specifically as follows: (0, 100, 0, 0), (-30, 40, 0, 0), (-35, 30, 5, 5) and (-85, 0, 0, 0). The calculated sum of the luminance compensation values is 100, 10, 5, and 85, respectively, and thus, the combination in which the sum of the luminance compensation values is the smallest is (-35, 30, 5, 5), and thus, it is regarded as the optimal combination.
And compensating the brightness of the LED lamp according to the optimal combination, thereby realizing the correction of the color temperature. The smaller the sum of the luminance compensation values thereof, the lower the power consumption required for the color temperature correction. Therefore, this second embodiment selects, as the optimum combination of the luminance compensation values for correcting the color temperature, one combination in which the sum of the luminance compensation values is the smallest, based on the energy consumption consideration during the correction.
It is to be understood that, as shown in fig. 5, in the third embodiment of the present invention, the step of selecting an optimal combination from the combinations of the plurality of luminance compensation values includes:
step S2621, respectively performing compensation calculation according to the combination of the multiple brightness compensation values, and determining the combination of the multiple compensated LED brightness values;
step S2622, selecting an LED brightness value combination of which the brightness value of each color LED in the combination does not exceed the corresponding maximum brightness value;
step S2623 of combining the luminance compensation values corresponding to the selected LED luminance value combinations as the candidate combinations;
step S2624, selecting the combination with the least compensation color type from the alternative combinations as the optimal combination of the brightness compensation values for correcting the color temperature.
In the third embodiment, the luminance compensation value combination corresponding to the LED luminance value combination selected according to the above-described limiting conditions (11) to (14) is used as a candidate combination, and a combination with the least number of compensation colors among the candidate combinations is determined as an optimal combination of luminance compensation values for correcting color temperature. According to the above-listed examples, four alternative combinations (0, 100, 0, 0), (-30, 40, 0, 0), (-35, 30, 5, 5) and (-85, 0, 0, 0), wherein only the brightness of the blue LED needs to be increased and only the brightness of the red LED needs to be decreased in the alternative combination (0, 100, 0, 0), i.e. only one kind of compensation color is used, and therefore, any one of the two can be used as the optimal combination.
The less the adjustment types of the supplementary colors are, the less the software program is corrected in the correction process, and the control is convenient. Therefore, in the third embodiment, based on the ease of operation of software in the correction process, one combination with the least variety of compensation colors is selected as the optimal combination of the luminance compensation values for correcting the color temperature.
It is understood that, in the fourth embodiment of the present invention, the optimal combination may be selected by considering both the power consumption and the control operation convenience of the software, and specifically, as shown in fig. 6, the step of selecting the optimal combination from the combinations of the plurality of brightness compensation values includes:
step S2631, respectively performing compensation calculation according to the combination of the multiple brightness compensation values, and determining the multiple compensated LED brightness value combinations;
step S2632, selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
step S2633, combining the brightness compensation values corresponding to the selected LED brightness value combinations as the candidate combinations;
step 2634, determining a target combination with the least compensation color types in the candidate combinations;
step 2635, when there are a plurality of the target combinations, selecting the target combination with the smallest sum of the luminance compensation values as the optimal combination of the luminance compensation values for correcting the color temperature.
That is, in the fourth embodiment, when selecting the optimal combination from the candidate combinations, the target combination with the least compensation color type is selected in consideration of convenience of software program operation in the correction process. When there are a plurality of target combinations, the target combination with the lowest energy consumption is selected as the optimal combination in consideration of the energy consumption in the calibration process, for example, only the brightness of the blue LED needs to be increased in the selected alternative combination (0, 100, 0, 0) of the third embodiment, (-85, 0, 0), only the brightness of the red LED needs to be decreased, and the latter combination with the lowest energy consumption is selected as the optimal combination.
It is understood that in other embodiments of the present invention, when selecting the optimal combination from the alternative combinations, the energy consumption in the calibration process may be considered first, and then the convenience of the software program operation in the calibration process may be considered. That is, a target combination with the smallest sum of the luminance compensation values is selected from the candidate combinations, and when there are a plurality of target combinations, a target combination with the smallest number of types of compensation colors is selected as the optimum combination of the luminance compensation values for correcting the color temperature.
It should be noted that the manner of determining the optimal combination of the luminance compensation values for correcting the color temperature from the combinations of the luminance compensation values is not limited to this, and as shown in fig. 7, in another embodiment of the present invention, the step of determining the optimal combination for correcting the color temperature from the combinations of the luminance compensation values according to a preset filtering rule includes:
step 2641, selecting a combination with the sum of the luminance compensation values smaller than a first preset threshold value as an alternative combination, or selecting a combination with the number of the compensated color types smaller than a second preset threshold value as an alternative combination, from the plurality of combinations of the luminance compensation values;
step S2642, selecting an optimal combination of the brightness compensation values for correcting color temperature from the alternative combinations according to the maximum brightness value and the alternative combinations;
step S2643, respectively performing compensation calculation according to the alternative combinations, and determining various compensated LED brightness value combinations;
step S2644, selecting an LED brightness value combination in which the brightness value of each color LED in the combination does not exceed the corresponding maximum brightness value;
step 2645 is performed to combine the luminance compensation values corresponding to the selected LED luminance value combinations into the optimum combination.
The first threshold and the second threshold may be set according to actual needs, for example, the first threshold may be set to 50mcd, and the second threshold may be set to two kinds. In this embodiment, a combination in which the sum of the luminance compensation values in the plurality of combinations of luminance compensation values is smaller than a first preset threshold value, or a combination in which the number of compensated color types is smaller than a second preset threshold value is determined, and the determined combination is used as an alternative combination; and performing compensation calculation according to the candidate combination, determining a plurality of compensated LED brightness value combinations, selecting the LED brightness value combinations meeting the condition requirements from the candidate combinations according to the limiting conditions (11) to (14), and finally taking the brightness compensation value combinations corresponding to the selected LED brightness value combinations as the optimal combinations.
After the optimal combination of the brightness compensation values is determined, the correction coefficient of the driving signal of the corresponding color LED can be calculated according to the brightness compensation value of each color LED in the optimal combination, and the calculation formula is as follows:
Figure 931661DEST_PATH_IMAGE016
corrected red driving signal R-signal' = R-signal x Fr；
Corrected green driving signal G-signal' = G-signal x Fg；
Corrected blue drive signalNumber B-signal' = B-signal x Fb；
Corrected white drive signal W-signal' = W-signal x Fw；
Wherein R-signal, G-signal, B-signal and W-signal are respectively driving signals under actual color temperatures of red LED, green LED, blue LED and white LED, and Fr，Fg，FbAnd FwCorrection coefficients for the drive signals of the red LED, the green LED, the blue LED and the white LED, respectively. For example, the LED fixture correction coefficients are calculated as follows:
the correction coefficients for the red LED are: 0.78232, respectively;
the correction coefficients for the green LED are: 1.40664, respectively;
the correction coefficients for the blue LED are: 5.20000, respectively;
the correction factor of the white LED is: 1.00000;
if the input driving signal of the LED bulb is R =15535, G =32750, B =200, and W =60000, the corrected driving signal is:
R-signal’ = 0.78232×15535；
G-signal’ = 1.40664×32750；
B-signal’= 5.20000×200；
W-signal’ = 1.00000×60000。
and step S28, sending the correction information to the LED lamp, so that the LED lamp can correct the color temperature according to the correction information.
In this embodiment, the brightness compensation value of each color can be determined according to the relationship between the compensation value of the tri-stimulus value of each color and the brightness, the correction coefficient corresponding to each color is obtained by solving, and the driving signals of the LEDs of each color are corrected according to the correction coefficient, so as to achieve the purpose of correcting the color temperature of the LED lamp.
Referring to fig. 8, a color temperature correction system according to a fifth embodiment of the invention is applied to an LED lamp 32, where the LED lamp 32 includes LEDs with multiple colors. The color temperature correction system comprises a lamp tray 33, a collecting device 34 and a control terminal 31.
The lamp tray 33 is used for bearing the LED lamps 32, in specific implementation, the lamp tray 33 can simultaneously bear a plurality of LED lamps 32, each LED lamp 32 is fixed in a mounting groove of the lamp tray 33, and the lamp tray 33 can supply power to the LED lamps 32 and isolate the light emission of the adjacent LED lamps 32.
The collecting device 34 is used for collecting the chromaticity coordinates and/or the luminance of the light emitted by the LED lamp 32, and may adopt a two-dimensional wavefront colorimeter. When the chromaticity coordinates and the brightness of the LED lamp are collected, the LED lamp 32 and the collection device 34 are in the dark room 35.
The control terminal 31 is connected to the LED lamp 32 and the acquisition device 34 through a wireless communication mode (such as bluetooth, wifi, etc.). The control terminal 31 is used for:
controlling the LED lamps to emit light by LEDs with different colors respectively, and acquiring chromaticity coordinates of the LEDs with corresponding colors;
receiving control information corresponding to a target color temperature, and controlling the LED lamp to be turned on according to the control information;
acquiring a tristimulus value of the actual color temperature of the lighted LED lamp and acquiring a tristimulus value of the target color temperature;
determining a combination of various brightness compensation values of the LEDs participating in the mixed light according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature and the chromaticity coordinates of the LEDs participating in the mixed light;
determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule;
determining correction information of driving signals corresponding to the LEDs of all colors participating in light mixing according to the optimal combination;
and sending the correction information to the LED lamp so as to enable the LED lamp to correct the color temperature according to the correction information.
Further, the above color temperature correction system, in some embodiments, the determining an optimal combination for correcting color temperature from a plurality of combinations of the luminance compensation values according to a preset filtering rule includes:
and selecting a combination with the minimum sum of the brightness compensation values from a plurality of combinations of the brightness compensation values as an optimal combination of the brightness compensation values for correcting the color temperature.
Further, the above color temperature correction system, in some embodiments, the determining an optimal combination for correcting color temperature from a plurality of combinations of the luminance compensation values according to a preset filtering rule includes:
and selecting the combination with the least compensated color types from the combinations of the brightness compensation values as the optimal combination of the brightness compensation values for correcting the color temperature.
Further, in some embodiments, after the step of controlling the LED lamps to emit light with LEDs of different colors, the color temperature correction system further includes:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting at least one alternative combination from the combinations of the brightness compensation values according to the combinations of the maximum brightness value and the brightness compensation values; and selecting the combination with the minimum sum of the brightness compensation values from the alternative combinations, and/or selecting the combination with the minimum compensation color type as the optimal combination of the brightness compensation values for correcting the color temperature.
Further, in the color temperature correction system, in some embodiments, the selecting at least one alternative combination from a plurality of combinations of the luminance compensation values according to the combination of the maximum luminance value and the plurality of the luminance compensation values includes:
respectively carrying out compensation calculation according to the combination of the various brightness compensation values, and determining various compensated LED brightness value combinations;
selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the alternative combination.
Further, in some embodiments, after the step of controlling the LED lamps to emit light with LEDs of different colors, the color temperature correction system further includes:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting a combination with the sum of the brightness compensation values smaller than a first preset threshold value from the multiple combinations of the brightness compensation values as an alternative combination, or selecting a combination with the number of the compensated color types smaller than a second preset threshold value as an alternative combination;
and selecting the optimal combination of the brightness compensation values for correcting the color temperature from the alternative combinations according to the maximum brightness value and the alternative combinations.
Further, in some embodiments, the selecting an optimal combination of the luminance compensation values for color temperature correction from the candidate combinations according to the maximum luminance value and the candidate combinations includes:
respectively carrying out compensation calculation according to the alternative combinations, and determining various compensated LED brightness value combinations;
selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the optimal combination.
The implementation principle and the generated technical effect of the control terminal provided by the embodiment of the present invention are the same as those of the foregoing method embodiment, and for the sake of brief description, no mention is made in the embodiment of the apparatus, and reference may be made to the corresponding contents in the foregoing method embodiment.
The embodiment of the invention also provides a control terminal, which comprises a memory and a processor, wherein the memory stores programs, and the programs realize any one of the methods when being executed by the processor.
An embodiment of the present invention further provides a computer-readable storage medium, on which a program is stored, where the program, when executed by a processor, implements any of the methods described above.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A color temperature correction method is applied to an LED lamp and is characterized in that the LED lamp comprises LEDs with multiple colors, and the color temperature correction method comprises the following steps:
controlling the LED lamps to emit light by LEDs with different colors respectively, and acquiring chromaticity coordinates of the LEDs with corresponding colors;
receiving control information corresponding to a target color temperature, and controlling the LED lamp to be turned on according to the control information;
acquiring a tristimulus value of the actual color temperature of the lighted LED lamp and acquiring a tristimulus value of the target color temperature;
determining a combination of various brightness compensation values of the LEDs participating in the mixed light according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature and the chromaticity coordinates of the LEDs participating in the mixed light;
determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule;
determining correction information of driving signals corresponding to the LEDs of all colors participating in light mixing according to the optimal combination;
sending the correction information to the LED lamp to enable the LED lamp to carry out color temperature correction according to the correction information; wherein
The step of determining a combination of a plurality of luminance compensation values of the LEDs participating in the mixed light according to the tristimulus values of the actual color temperature, the tristimulus values of the target color temperature, and the chromaticity coordinates of the LEDs of the colors participating in the mixed light includes:
respectively calculating the difference value of each stimulus value according to the tristimulus value of the actual color temperature and the tristimulus value of the target color temperature;
and calculating the combination of various brightness compensation values of the LEDs participating in the light mixing according to the difference value and the chromaticity coordinates of the LEDs participating in the light mixing.
2. The color temperature correction method of claim 1, wherein the determining an optimal combination for correcting the color temperature from a plurality of combinations of the illumination compensation values according to a preset filtering rule comprises:
and selecting a combination with the minimum sum of the brightness compensation values from a plurality of combinations of the brightness compensation values as an optimal combination of the brightness compensation values for correcting the color temperature.
3. The color temperature correction method of claim 1, wherein the determining an optimal combination for correcting the color temperature from a plurality of combinations of the illumination compensation values according to a preset filtering rule comprises:
and selecting the combination with the least compensated color types from the combinations of the brightness compensation values as the optimal combination of the brightness compensation values for correcting the color temperature.
4. The color temperature correction method of claim 1, wherein after the step of controlling the LED lamp to emit light with LEDs of different colors, respectively, further comprising:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting at least one alternative combination from the combinations of the brightness compensation values according to the combinations of the maximum brightness value and the brightness compensation values;
and selecting the combination with the minimum sum of the brightness compensation values from the alternative combinations, and/or selecting the combination with the minimum compensation color type as the optimal combination of the brightness compensation values for correcting the color temperature.
5. The color temperature correction method of claim 4, wherein said selecting at least one alternative combination from a plurality of combinations of the luminance compensation values based on the maximum luminance value and the plurality of combinations of the luminance compensation values comprises:
respectively carrying out compensation calculation according to the combination of the various brightness compensation values, and determining various compensated LED brightness value combinations;
selecting at least one LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the alternative combination.
6. The color temperature correction method of claim 1, wherein after the step of controlling the LED lamp to emit light with LEDs of different colors, respectively, further comprising:
acquiring the maximum brightness value of the LED with the corresponding color;
the determining an optimal combination for correcting color temperature from a plurality of combinations of the brightness compensation values according to a preset screening rule comprises:
selecting a combination with the sum of the brightness compensation values smaller than a first preset threshold value from multiple combinations of the brightness compensation values as an alternative combination, and/or selecting a combination with the number of compensated color types smaller than a second preset threshold value as an alternative combination;
and selecting the optimal combination of the brightness compensation values for correcting the color temperature from the alternative combinations according to the maximum brightness value and the alternative combinations.
7. The color temperature correction method of claim 6, wherein said selecting an optimal combination of the luminance compensation values for correcting the color temperature from the candidate combinations based on the maximum luminance value and the candidate combinations comprises:
respectively carrying out compensation calculation according to the alternative combinations, and determining various compensated LED brightness value combinations;
selecting an LED brightness value combination with the brightness value of each color LED not exceeding the corresponding maximum brightness value in the combination;
and combining the brightness compensation values corresponding to the selected LED brightness value combination into the optimal combination.
8. A color temperature correction system is applied to an LED lamp, the LED lamp comprises LEDs with a plurality of colors, and is characterized in that the color temperature correction system comprises,
the lamp tray is used for bearing the LED lamp;
the acquisition device is used for acquiring the luminous chromaticity coordinates and/or the luminance of the LED lamp;
a control terminal for controlling the collecting device and the LED lamp, and capable of implementing the method of any one of claims 1-7.
9. A control terminal, characterized in that it comprises a memory and a processor, said memory storing a program which, when executed by said processor, implements the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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