WO2019237757A1

WO2019237757A1 - Color correction method for multi-color lamp

Info

Publication number: WO2019237757A1
Application number: PCT/CN2019/075204
Authority: WO
Inventors: 蒋伟楷
Original assignee: 广州市浩洋电子股份有限公司
Priority date: 2018-06-13
Filing date: 2019-02-15
Publication date: 2019-12-19
Also published as: CN108668411B; CN108668411A

Abstract

A color correction method for a multi-color lamp comprises: collecting dot-matrix original light color parameters of multi-color lamps belonging to different batches or used at different times; and performing targeted acquisition of correction coefficient matrices of the respective multi-color lamps, and storing the same in color correction modules thereof. When in use, the color correction modules process source signals on the basis of the correction coefficient matrices of the respective multi-color lamps so as to control a drive circuit to drive light sources to emit light, thereby realizing standardized and consistent light colors, and enabling a user to perform dimming and color correction operations conveniently.

Description

Color lamp color correction method

Technical field

The present invention relates to the technical field of colored lamps, and more particularly, to a color lamp color correction method.

Background technique

During stage performances, multiple colored lights are usually used at the same time, but due to the deviation of the chromaticity and luminous intensity of the LED lamp beads due to the source process in each colored light, the same input signal, the same driving current, and different colored lights are caused. There is a large difference in the color of the light shown. This light color difference seriously damages the standardization and consistency of the color lights, and brings the inconvenience of dimming and color adjustment to the user.

Summary of the Invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a color lamp color correction method, which can adjust multiple color lamps at the same time, so as to achieve the standardization and consistency of light color, and bring the convenience of dimming and coloring to users.

In order to achieve the above objective, the technical solution adopted by the present invention is:

Provided is a color lamp color correction method. The color lamp includes LED lamps of multiple colors. Each color lamp is provided with a color correction module, which includes the following steps:

S1. Data collection and processing, including the following steps:

S11. Collect the dot matrix original light color parameters of each color of a colored lamp;

S12. Process the collected original light color parameters of the dot matrix and draw a chromaticity diagram corresponding to the original color gamut of the color lamp, where the color gamut is a range area composed of the number of colors that can be expressed by a certain color mode;

S13. Repeat steps S11 to S12 to obtain chromaticity diagrams corresponding to the original color gamut of n colored lamps, and draw the intersection area of the chromaticity diagrams of all colored lamps as the adjustable effective color gamut;

S2. Obtaining the correction coefficient matrix of each color lamp: Set the target color gamut within the adjustable effective color gamut, combine the obtained original color gamut of each color lamp, calculate the correction coefficient matrix of each color lamp, and Store it in the color correction module of the color lamp;

S3. Send the source signal to the color correction module of each color light. The color correction module processes the source signal based on the correction coefficient matrix to obtain the corrected signal, and uses the corrected signal to control the driving circuit to drive the light source to emit light.

Preferably, in step S11, the light color parameter acquisition device is used to collect the original light color parameters of the RGB three primary color dot matrixes of one color lamp, and the original light color parameter of the dot matrix is the Yxy value under the CIE Yxy color model, where Y is The brightness value is recorded as RY_bright, GY_bright, BY_bright, and xy is the color sitting mark (Rx, Ry), (Gx, Gy), (Bx, By); when collecting, control the colored lights to light red, and the light color parameter collection equipment Collect the red dot matrix original light color parameters at this time, and repeat the operation to collect the dot matrix original light color parameters of other base colors until all the base colors are collected;

In step S12, the collected original light color parameters of the dot matrix are processed to be converted into the original color gamut space tristimulus value matrix [XYZ_original] _i , and the corresponding color of the color lamp is drawn in the CIE XYZ 1931 standard colorimetric system. The chromaticity diagram of the domain. In the CIE XYZ 1931 standard chromaticity system, [X], [Y], and [Z] are used to represent the three primary colors of R, G, and B;

In step S13, steps S11 to S12 are repeated to obtain the original color gamut space tristimulus matrix [XYZ_original] _{i of} n colored lights, where i is 1 ... n, and the corresponding chromaticity diagram is drawn. The standard color is CIE XYZ 1931 The intersection area of the chromaticity diagram of all colored lights in the degree system is used as the adjustable effective color gamut;

In step S2, a target color gamut space tristimulus value matrix [XYZ_target] is set in the adjustable effective color gamut, and the original color gamut space tristimulus value matrix [XYZ_original] _i of each color lamp that has been obtained is calculated to obtain each The correction coefficient matrix [conversion_coefficient] _{i of} the desk color lamp is stored in the color correction module of the desk color lamp.

Preferably, in step S12, the collected point matrix original light color parameters are processed by formula (1) to convert them into the original color gamut space tristimulus value matrix [XYZ_original] _i , and [XYZ_original] _i is

Preferably, in step S2, the correction coefficient matrix [conversion_coefficient] _i of each color lamp is calculated as: [XYZ_target] is

[conversion_coefficient] _i is

[conversion_coefficient] _i * [XYZ_original] _i = [XYZ_target] (2);

Where the correction coefficient matrix [conversion_coefficient] _i :

RR is the brightness correction coefficient of the red light when the input source signal is red;

RG is the brightness correction coefficient of the green light when the input source signal is red;

RB is the brightness correction coefficient of the blue light when the input source signal is red;

GR is the brightness correction coefficient of the red light when the input source signal is green;

GG is the brightness correction coefficient of the green light when the input source signal is green;

GB is the brightness correction coefficient of the blue light when the input source signal is green;

BR is the brightness correction coefficient of the red light when the input source signal is blue;

BG is the brightness correction coefficient of the green light when the input source signal is blue;

BB is the brightness correction coefficient of the blue light when the input source signal is blue.

For example, the calculated correction coefficient matrix of a color lamp is

Preferably, the color correction module includes a main chip and a correction chip. In step S3, the console sends a DMX source signal to the main chip, and the main chip processes the source signal to obtain data of each primary color channel, and converts it to 16 through a dimming gamma curve table. Bit [PWM_original] _i value, use the correction coefficient matrix [conversion_coefficient] _i in the correction chip and combine formula (3) to correct the 16-bit [PWM_original] _i value to obtain the corrected 16-bit [PWM_target] value for each primary color;

[PWM_target] = [conversion_coefficient] _i * [PWM_original] _i (3); the correction chip transmits the 16-bit [PWM_target] value of each primary color after correction to the main chip, so as to control the driving circuit to obtain corresponding currents of different magnitudes so that the current The light source is driven to emit light. For example, when [PWM_original] _i = [R235, G60, B120], the correction coefficient matrix is

When [PWM_target] is recorded as [R ', G', B '], substituting into formula (3) can be obtained:

R ’= R * RR + G * GR + B * BR

= 235 * 0.815562 + 60 * 0.011104 + 120 * 0.211122

= 217.66

≈218

G ’= R * RG + G * GG + B * BG

= 235 * 0.111135 + 60 * 0.845431 + 120 * 0.012226

= 78.31

≈78

B ’= R * RB + G * GB + B * BB

= 235 * 0.001227 + 60 * 0.242253 + 120 * 0.764322

= 106.54

≈107

That is, the input source signal [R235, G60, B120], and the actual signal on the pixel after correction is [R218, G78, B107] to achieve light color standardization and consistency.

Preferably, the color lamp further includes W color LED lamp beads, and step S1 further includes collecting the original color parameter of the W matrix of a color lamp using a light color parameter acquisition device, and the original color of the dot matrix. The parameter is the Yxy value under the CIE Yxy color model, which is written as WY_bright, (Wx, Wy); processing WY_bright, (Wx, Wy) to obtain the position of the white point in the CIE XYZ 1931 standard colorimetric system [W_one]; take steps The intersection area of all colored lamp chromaticity diagrams in S13 is used as the original intersection color gamut space tristimulus value matrix [XYZ_intersection], and the data in [XYZ_intersection] is superimposed to obtain [W_rgbintecsetion], and [XYZ_intersection] is

Let [W_rgbintecsetion] be

[W_rgbintecsetion] obtained by formula (4);

Through the processing of [W_one] and [W_rgbintecsetion], a color mixing correction matrix [mix_coefficient] is obtained. In step S2, the target color gamut space tristimulus value matrix [XYZ_target] is set in the adjustable effective color gamut, and then the color mixing correction matrix [mix_coefficient] It is modified to obtain [XYZ_target_new], and the original color gamut space tristimulus matrix [XYZ_original] _{i of} each color lamp is obtained, and a correction coefficient matrix [conversion_coefficient] _{i of} each color lamp is calculated. In this way, a precise set of target color gamut space tristimulus value matrix can be obtained, and the accuracy of light color standardization and consistency is improved.

Further preferably, let [W_one] be

Calculate [W_one] by formula (5):

Calculate the color mixing correction matrix [mix_coefficient] by formula (6):

[mix_coefficient] * [W_rgbintecsetion] = [W_one] (6); Correct the set target color gamut space tristimulus value matrix [XYZ_target] by formula (7):

[XYZ_target_new] = [mix_coefficient] * [XYZ_target] (7).

Further preferably, the minimum value among the WY_bright values of all the color lamps is taken as the WY_bright value and substituted into the formula (5) to calculate [W_one]. The WY_bright value of different colored lights may be different. Take the minimum value to prevent the color correction result from being affected.

Still further preferably, the average value of Wx of all the color lamps and the average value of Wy of all the color lamps are taken as the Wx value and the Wy value to calculate [W_one] in formula (5). When producing colored lights, the position of the W color LED lamp beads may be slightly different. By averaging the color coordinates, the color correction result can be guaranteed.

Preferably, when the color lamp further includes W-color LED lamp beads, the correction coefficient of the W-color lamp beads is set to 1.

Compared with the prior art, the beneficial effects of the present invention are:

The invention relates to a method for correcting the color of a colored lamp, by collecting the original light color parameters of the dot matrix of multiple colored lamps of different batches or different use times, and obtaining a correction coefficient matrix of each colored lamp in a targeted manner and Stored in the color correction module of the color lamp, the color correction module processes the source signal based on the correction coefficient matrix of each color lamp when in use, in order to control the driving circuit to drive the light source to emit light, so that the light color can be standardized and consistent. Bring the convenience of dimming and toning to users.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a signal flow diagram of each color lamp in a color lamp color correction method according to this embodiment.

detailed description

The present invention is further described below in combination with specific embodiments. Among them, the drawings are only for illustrative descriptions, and they are only schematic diagrams, not physical maps, and cannot be understood as a limitation on this patent; in order to better illustrate the embodiments of the present invention, some components of the drawings may be omitted, Enlarging or reducing does not represent the size of the actual product; for those skilled in the art, it may be understood that certain well-known structures and their descriptions in the drawings may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms "up", "down", "left", and "right" The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplified description. It does not indicate or imply that the device or element referred to must have a specific orientation, a specific The azimuth structure and operation, therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes, and should not be construed as a limitation on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

Examples

This embodiment provides a color lamp color correction method. The color lamp includes LED lamps of multiple colors. Each color lamp is provided with a color correction module, including the following steps:

S1. Data collection and processing, including the following steps:

In this embodiment, in step S11, a light color parameter acquisition device is used to separately collect the RGB three primary color dot matrix original light color parameters of a color lamp, and the dot matrix original light color parameters are Yxy values under the CIE Yxy color model, where: Y is the brightness value recorded as RY_bright, GY_bright, BY_bright, and xy is the color sitting mark (Rx, Ry), (Gx, Gy), (Bx, By); during collection, control the colored light to light red light, light color parameters The acquisition device collects the red dot matrix original light color parameters at this time, and repeats the operation to collect the dot matrix original light color parameters of other base colors until all the base colors are collected;

Wherein, in step S12, the collected point matrix original light color parameters are processed by formula (1) to convert them into the original color gamut space tristimulus value matrix [XYZ_original] _i . Let [XYZ_original] _i be

In addition, in step S2, the correction coefficient matrix [conversion_coefficient] _i of each color lamp is calculated as: [XYZ_target] is

[conversion_coefficient] _i is

[conversion_coefficient] _i * [XYZ_original] _i = [XYZ_target] (2);

Where the correction coefficient matrix [conversion_coefficient] _i :

For example, the calculated correction coefficient matrix of a color lamp is

The color correction module includes a main chip and a correction chip. In step S3, the console sends a DMX source signal to the main chip, and the main chip processes the source signal to obtain data of each primary color channel, and converts it to 16 bits through a dimming gamma curve table. [PWM_original] _i value, using the correction coefficient matrix [conversion_coefficient] _i in the correction chip and combining formula (3) to correct the 16-bit [PWM_original] _i value to obtain the corrected 16-bit [PWM_target] value for each primary color;

[PWM_target] = [conversion_coefficient] _i * [PWM_original] _i (3);

The correction chip transmits the 16-bit [PWM_target] value of each primary color after correction to the main chip, so as to control the driving circuit to obtain corresponding currents of different magnitudes, so that the current drives the light source to emit light.

For example, when [PWM_original] _i = [R235, G60, B120], the correction coefficient matrix is

When [PWM_target] is [R ', G', B '], substituting into formula (3) can be obtained:

R ’= R * RR + G * GR + B * BR

= 235 * 0.815562 + 60 * 0.011104 + 120 * 0.211122

= 217.66

≈218

G ’= R * RG + G * GG + B * BG

= 235 * 0.111135 + 60 * 0.845431 + 120 * 0.012226

= 78.31

≈78

B ’= R * RB + G * GB + B * BB

= 235 * 0.001227 + 60 * 0.242253 + 120 * 0.764322

= 106.54

≈107

In addition, the colored light also includes W color LED lamp beads, and step S1 further includes using a light color parameter acquisition device to collect W color dot matrix original light color parameters of a color lamp, and the dot matrix original light color parameters The Yxy value under the CIE Yxy color model is written as WY_bright, (Wx, Wy); WY_bright, (Wx, Wy) is processed to obtain the position of the white point in the CIE XYZ 1931 standard chromaticity system [W_one]; take step S13 The intersection area of all the colored lamp chromaticity diagrams in the image is used as the original intersection color gamut space tristimulus value matrix [XYZ_intersection], and the data in [XYZ_intersection] is superimposed to obtain [W_rgbintecsetion].

Let [W_rgbintecsetion] be

[W_rgbintecsetion] obtained by formula (4);

Through the processing of [W_one] and [W_rgbintecsetion], a color mixing correction matrix [mix_coefficient] is obtained. In step S2, the target color gamut space tristimulus value matrix [XYZ_target] is set in the adjustable effective color gamut, and then the color mixing correction matrix [mix_coefficient] is used. It is modified to obtain [XYZ_target_new], and the original color gamut space tristimulus matrix [XYZ_original] _{i of} each color lamp is obtained, and a correction coefficient matrix [conversion_coefficient] _{i of} each color lamp is calculated. In this way, a precise set of target color gamut space tristimulus value matrix can be obtained, and the accuracy of light color standardization and consistency is improved.

In this embodiment, write [W_one] as

Calculate [W_one] by formula (5):

Calculate the color mixing correction matrix [mix_coefficient] by formula (6):

[XYZ_target_new] = [mix_coefficient] * [XYZ_target] (7).

Among them, take the minimum value of the WY_bright values of all the colored lamps as the WY_bright value and substitute it in formula (5) to calculate [W_one]. The WY_bright value of different colored lights may be different. Take the minimum value to prevent the color correction result from being affected.

In addition, take the average value of Wx of all the color lamps and the average value of Wy of all the color lamps as the Wx value and the Wy value to calculate [W_one] in formula (5). When producing colored lights, the position of the W color LED lamp beads may be slightly different. By averaging the color coordinates, the color correction result can be guaranteed.

Wherein, when the color lamp further includes W-color LED lamp beads, the correction coefficient of the W-color lamp beads is set to 1.

Obviously, the foregoing embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. There is no need and cannot be exhaustive for all implementations. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

A method for color correction of a color lamp. The color lamp includes LED lamps of multiple colors, and is characterized in that a color correction module is installed in each color lamp, including the following steps:

S1. Data collection and processing, including the following steps:

S11. Collect the dot matrix original light color parameters of each color of a colored lamp;

S12. Process the collected original light color parameters of the dot matrix and draw a chromaticity diagram corresponding to the original color gamut of the color lamp, where the color gamut is a range area composed of the number of colors that can be expressed by a certain color mode;

S13. Repeat steps S11 to S12 to obtain chromaticity diagrams corresponding to the original color gamut of n colored lamps, and draw the intersection area of the chromaticity diagrams of all colored lamps as the adjustable effective color gamut;

S2. Obtaining the correction coefficient matrix of each color lamp: Set the target color gamut within the adjustable effective color gamut, combine the obtained original color gamut of each color lamp, calculate the correction coefficient matrix of each color lamp, and Store it in the color correction module of the color lamp;

S3. Send the source signal to the color correction module of each color light. The color correction module processes the source signal based on the correction coefficient matrix to obtain the corrected signal, and uses the corrected signal to control the driving circuit to drive the light source to emit light.
The method for color correction of a colored lamp according to claim 1, wherein the colored lamp comprises LED lamp beads of three colors of RGB,

In step S11, the light color parameter acquisition device is used to collect the original light color parameters of the RGB three-primary dot matrix of a color light, the original light color parameters of the dot matrix are Yxy values under the CIE Yxy color model, where Y is the brightness value Recorded as RY_bright, GY_bright, BY_bright, and xy are colored seats labeled (Rx, Ry), (Gx, Gy), (Bx, By);

In step S12, the collected original light color parameters of the dot matrix are processed to be converted into the original color gamut space tristimulus value matrix [XYZ_original] i , and the corresponding color lights are drawn in the CIE XYZ 1931 standard chromaticity system Chromaticity diagram of original color gamut;

In step S13, steps S11 to S12 are repeated to obtain the original color gamut space tristimulus matrix [XYZ_original] i of n colored lights, where i is 1 ... n, and the corresponding chromaticity diagram is drawn. The standard color is CIE XYZ 1931 The intersection area of the chromaticity diagram of all colored lights in the degree system is used as the adjustable effective color gamut;

In step S2, a target color gamut space tristimulus value matrix [XYZ_target] is set in the adjustable effective color gamut, and the original color gamut space tristimulus value matrix [XYZ_original] i of each color lamp that has been obtained is calculated to obtain each The correction coefficient matrix [conversion_coefficient] i of the desk color lamp is stored in the color correction module of the desk color lamp.
The method for color correction of a colored lamp according to claim 2, characterized in that in step S12, the collected point matrix original light color parameters are processed by formula (1) to convert them into the original color gamut space. Stimulus value matrix [XYZ_original] i , let [XYZ_original] i be
The method for color correction of a colored lamp according to claim 2, characterized in that, in step S2, the correction coefficient matrix [conversion_coefficient] i of each colored lamp is calculated as: [XYZ_target] is
[conversion_coefficient] i is

[conversion_coefficient] i * [XYZ_original] i = [XYZ_target] (2);

Where the correction coefficient matrix [conversion_coefficient] i :

RR is the brightness correction coefficient of the red light when the input source signal is red;

RG is the brightness correction coefficient of the green light when the input source signal is red;

RB is the brightness correction coefficient of the blue light when the input source signal is red;

GR is the brightness correction coefficient of the red light when the input source signal is green;

GG is the brightness correction coefficient of the green light when the input source signal is green;

GB is the brightness correction coefficient of the blue light when the input source signal is green;

BR is the brightness correction coefficient of the red light when the input source signal is blue;

BG is the brightness correction coefficient of the green light when the input source signal is blue;

BB is the brightness correction coefficient of the blue light when the input source signal is blue.
The color lamp color correction method according to claim 2, wherein the color correction module includes a main chip and a correction chip; in step S3, the main chip processes the source signal to obtain data of each primary color channel, and adjusts the dimming gamma The curve table is converted into a 16-bit [PWM_original] i value, and the correction coefficient matrix [conversion_coefficient] i in the correction chip is combined with the formula (3) to correct the 16-bit [PWM_original] i value to obtain the corrected 16-bit [PWM_target] ]value;

[PWM_target] = [conversion_coefficient] i * [PWM_original] i (3);

The correction chip transmits the 16-bit [PWM_target] value of each primary color after correction to the main chip, so as to control the driving circuit to obtain corresponding currents of different magnitudes, so that the current drives the light source to emit light.
The method for correcting color of a colored lamp according to claim 3, wherein the colored lamp further comprises W-color LED lamp beads, and step S1 further comprises collecting light of each colored lamp using a light color parameter acquisition device. W color dot matrix original light color parameter, the dot matrix original light color parameter is the Yxy value under the CIEYxy color model, written as WY_bright, (Wx, Wy); processing WY_bright, (Wx, Wy) to obtain in CIE XYZ The position of the white point in the 1931 standard chromaticity system [W_one]; take the intersection area of all the color lamp chromaticity diagrams in step S13 as the original intersection color gamut space tristimulus value matrix [XYZ_intersection], and superimpose the data in [XYZ_intersection] Get [W_rgbintecsetion] by processing, write [XYZ_intersection] as
Let [W_rgbintecsetion] be
[W_rgbintecsetion] obtained by formula (4);

Through the processing of [W_one] and [W_rgbintecsetion], a color mixing correction matrix [mix_coefficient] is obtained. In step S2, the target color gamut space tristimulus value matrix [XYZ_target] is set in the adjustable effective color gamut, and then the color mixing correction matrix [mix_coefficient] is used. It is modified to obtain [XYZ_target_new], and the original color gamut space tristimulus matrix [XYZ_original] i of each color lamp is obtained, and a correction coefficient matrix [conversion_coefficient] i of each color lamp is calculated.
The method for correcting color of a colored lamp according to claim 6, characterized in that [W_one] is
Calculate [W_one] by formula (5):

Calculate the color mixing correction matrix [mix_coefficient] by formula (6):

[mix_coefficient] * [W_rgbintecsetion] = [W_one]

(6);

Correct the set target color gamut space tristimulus value matrix [XYZ_target] by formula (7):

[XYZ_target_new] = [mix_coefficient] * [XYZ_target] (7).
The method for color correction of a color lamp according to claim 7, characterized in that the minimum value of the WY_bright values of all the color lamps is taken as the WY_bright value to calculate [W_one] in formula (5).
The color correction method for a color lamp according to claim 8, characterized in that the average value of Wx of all the color lamps and the average value of Wy of all the color lamps are taken as the Wx value and the Wy value and substituted into the formula (5) [W_one] is calculated.
The method for correcting color of a color lamp according to claim 6, wherein when the color lamp further comprises LED beads of W color, the correction coefficient of the W color beads is set to 1.