CN111458967A - Color and color temperature calibration method, calibration device and projection display equipment - Google Patents

Color and color temperature calibration method, calibration device and projection display equipment Download PDF

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CN111458967A
CN111458967A CN202010299020.9A CN202010299020A CN111458967A CN 111458967 A CN111458967 A CN 111458967A CN 202010299020 A CN202010299020 A CN 202010299020A CN 111458967 A CN111458967 A CN 111458967A
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brightness
color
target
luminance
coordinate
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CN111458967B (en
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吕思豪
郝瑞娜
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Goertek Microelectronics Inc
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity

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Abstract

The invention discloses a color and color temperature calibration method, a calibration device and projection display equipment, wherein the method comprises the steps of receiving target color coordinates representing target colors and target brightness; matching multiple brightness according with the target color coordinate and the target brightness; according to the corresponding relation between the pre-stored color brightness and the current, combining the multiple brightness and the corresponding relation for comparison to obtain multiple current values; and calibrating the color temperature according to the multiple current values. The technical scheme of the invention can effectively calibrate the color temperature and meet the use requirement.

Description

Color and color temperature calibration method, calibration device and projection display equipment
Technical Field
The invention relates to the technical field of projection display, in particular to a color and color temperature calibration method, a calibration device and projection display equipment.
Background
In projection display, color temperature calibration is generally performed on colors formed by light emitted from a light emitting device, and the color temperature represents color components in the light. At present, the duty ratio of each color light emitting device is preset, the on and off time is preset, and the corresponding light emitting device is calibrated by the preset duty ratio.
The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.
Disclosure of Invention
Therefore, in order to calibrate color temperature according to the duty ratio and to solve the problem that the use requirement is difficult to achieve, it is necessary to provide a color temperature calibration method, a calibration device and a projection apparatus, which can effectively calibrate color temperature and meet the use requirement.
In order to achieve the above object, the present invention provides a color temperature calibration method, including:
receiving a target color coordinate representing a target color and a target brightness;
matching multiple brightness according with the target color coordinate and the target brightness;
according to the corresponding relation between the pre-stored color brightness and the current, combining the multiple brightness and the corresponding relation for comparison to obtain multiple current values;
and calibrating the color temperature according to the multiple current values.
Optionally, the target color comprises white, the target color consists of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing a red color, a second luminance representing a green color and a third luminance representing a blue color;
the step of matching out multiple luminances that meet the target color coordinates and the target luminance includes:
matching the first brightness, the second brightness and the third brightness which accord with the target color coordinate and the target brightness;
the step of obtaining multiple current values by combining and contrasting the multiple brightness and the corresponding relation according to the corresponding relation between the pre-stored color brightness and the current comprises the following steps:
according to the corresponding relation between the pre-stored color brightness and the current, the first brightness, the second brightness and the third brightness are respectively combined and contrasted with the corresponding relation to obtain a first current value, a second current value and a third current value; the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness.
Optionally, the red color corresponds to a first color coordinate representing its color, the green color corresponds to a second color coordinate representing its color, and the blue color corresponds to a third color coordinate representing its color;
before the step of matching the first brightness, the second brightness and the third brightness which meet the target color coordinate and the target brightness, the method comprises the following steps:
generating generation relations between the target color coordinate and the target brightness and the first brightness, the second brightness and the third brightness, and the first color coordinate, the second color coordinate and the third color coordinate;
the step of matching the first luminance, the second luminance, and the third luminance that meet the target color coordinate and the target luminance includes:
and matching the first brightness, the second brightness and the third brightness which accord with the target color coordinate and the target brightness according to the generation relation.
Optionally, the target color coordinate is (x)m，ym) The target brightness is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) The third brightness is (x)b，yb) The first brightness is LrThe second brightness is LgAnd the third brightness is LbThen the generation relationship is
Figure BDA0002456395390000021
Optionally, before the step of obtaining the multiple current values by comparing the multiple luminances and the corresponding relations according to the pre-stored corresponding relations between the color luminance and the current, the method includes:
obtaining a partial current value corresponding to partial color brightness by carrying out ascending value or descending value on the current value from small to large;
and carrying out interpolation processing on the partial current values to generate a corresponding relation between color brightness and current, and storing the corresponding relation.
Optionally, before the step of matching out the multiple luminances corresponding to the target color coordinates and the target luminance, the method further includes:
establishing the target color coordinate, the target brightness and the multiple brightness initial comparison table;
the step of matching out multiple luminances that meet the target color coordinates and the target luminance includes:
and searching the color brightness ratio according to the initial comparison table to obtain multiple brightness which accords with the target color coordinate and the target brightness.
Further, in order to achieve the above object, the present invention also provides a color temperature calibration apparatus, comprising:
a receiving module for receiving a target color coordinate representing a target color and a target brightness;
the matching module is used for matching multiple luminances according with the target color coordinate and the target luminance;
the storage module is used for storing the corresponding relation between the color brightness and the current;
the comparison module is used for combining and comparing the multiple brightness and the corresponding relation to obtain multiple current values according to the corresponding relation of the pre-stored color brightness and current;
and the calibration module is used for calibrating the color temperature according to the multiple current values.
Optionally, the target color comprises white, the target color consists of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing a red color, a second luminance representing a green color and a third luminance representing a blue color;
the matching module is further configured to match the first brightness, the second brightness, and the third brightness that meet the target color coordinate and the target brightness;
the comparison module is further configured to compare the first brightness, the second brightness and the third brightness with the corresponding relationship respectively according to a pre-stored corresponding relationship between color brightness and current to obtain a first current value, a second current value and a third current value; the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness.
Optionally, the red color corresponds to a first color coordinate representing its color, the green color corresponds to a second color coordinate representing its color, and the blue color corresponds to a third color coordinate representing its color;
the device comprises:
a generating module, configured to generate generation relationships between the target color coordinate and the target luminance and the first luminance, the second luminance and the third luminance, and the first color coordinate, the second color coordinate and the third color coordinate;
the matching module is further configured to match the first brightness, the second brightness, and the third brightness that meet the target color coordinate and the target brightness according to the generation relationship.
Further, in order to achieve the above object, the present invention also provides a projection display apparatus comprising: a memory, a processor, and a color temperature calibration program stored on the memory and executable on the processor; the color temperature calibration program when executed by the processor implements the steps of the color temperature calibration method as described above.
In the technical scheme provided by the invention, the corresponding relation between the color brightness and the corresponding current is generated in advance, the target color coordinate and the target brightness are received, the target color is taken as a calibration object, and the corresponding brightness of each color in the formed target color, namely the multiple brightness, is determined according to the target color coordinate and the target brightness. And comparing the multiple brightness with the corresponding relation between the color brightness and the corresponding current magnitude generated in advance to obtain the corresponding current value, namely the multiple current value, calibrating the corresponding light-emitting device according to the multiple current value to ensure that the light-emitting brightness is the same, further effectively calibrating the color temperature, improving the calibration accuracy and meeting the use requirement.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flowchart illustrating a color temperature calibration method according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a color temperature calibration method according to a second embodiment of the present invention;
FIG. 3 is a flowchart illustrating a color temperature calibration method according to a third embodiment of the present invention;
FIG. 4 is a flowchart illustrating a color temperature calibration method according to a fifth embodiment of the present invention;
FIG. 5 is a flowchart illustrating a color temperature calibration method according to a sixth embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a color temperature calibration apparatus according to the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
10 Receiving module 60 Generation module
20 Proportioning module 70 Value module
30 Memory module 80 Interpolation module
40 Comparison module 90 Building module
50 Calibration module
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention provides a color and temperature calibration method for a projection display device, where the projection display device includes a plurality of projection display modes, such as L ED (L bright Emitting Diode) display, D L P (Digital L bright Processing) display, or L BS (L as Bean Scanning) display, where the color temperature is used to represent the content of color components in light, and the color temperature is usually represented by color coordinates in chromaticity coordinates, i.e. the color temperature is calculated by the color coordinates.
In step S10, a target color coordinate and a target brightness representing a target color are received. The target color is a target of the calibrated color, the target color comprising colored coordinates, i.e. target color coordinates. The target color also includes a target of brightness, i.e., a target brightness. It will be appreciated that the target color coordinates reflect the type of color displayed. That is, the color temperature can be calculated by the target color coordinates, and then the position of the target color in the chromaticity diagram is obtained. The target luminance reflects the brightness of a color, and generally, the unit of the target luminance includes lumens (lm).
The chromaticity diagram is a plane diagram of a functional expression of a blackbody locus in chromaticity, and the change of different temperatures of a blackbody forms an arc locus on the chromaticity diagram, and the locus is called the blackbody locus. And establishing a plane coordinate system with the horizontal axis as the x axis and the vertical axis as the y axis, and obtaining the position of the target color in the chromaticity diagram by determining the horizontal coordinate and the vertical coordinate.
Step S20, matching multiple brightness according with the target color coordinate and the target brightness; generally, the colors of light forming the target color include a plurality of colors. The glasman law is the law of additive mixing of colored light. The method specifically comprises the following steps: (1) color-complementing law, which means that any one color has another color mixed with it to generate white and grey; (2) the color space law means that any two non-complementary colors are mixed to generate a new mixed color or a middle color between the two mixed colors; (3) substitution law means that colors produced by mixing any different colors can be mutually substituted; (4) a brightness addition law, which means that the total brightness of the mixed color is the sum of the brightness of each color constituting the mixed color; (5) human vision can only distinguish three changes of lightness, hue and saturation of color. These rules apply only to the additive mixing of color shades and not to the mixing of pigments. It is known from the grassmann law that a plurality of light colors form a target color, that is, multiple color coordinates and multiple brightness of the plurality of light colors form a target color coordinate and a target brightness. Similarly, the multiple brightness can be calculated through the target color coordinate, the target brightness and the multiple color coordinate, and the brightness and darkness of the light-emitting device are generally influenced by the current magnitude. I.e. the corresponding current is deduced from the brightness. And then the corresponding light emitting device is calibrated by current.
Step S30, according to the pre-stored corresponding relation between color brightness and current, combining the multiple brightness and corresponding relation to obtain multiple current values; generally, brightness and darkness of multiple brightness are affected by current, the current is large, the number of emitted light rays of corresponding light emitting devices is increased, and an image is brighter. The current is small, the emission light of the corresponding light emitting device becomes less, and the calibration time can be saved by generating the corresponding relation between the color brightness and the current in advance.
In step S40, the color temperature is calibrated according to the multiple current values.
The multiple luminance corresponds to multiple current values, the multiple luminance refers to luminance of a plurality of colors included in the formed target luminance, and the multiple current values refer to current values corresponding to the luminance of the plurality of colors. And calibrating the brightness of the light-emitting device by determining the magnitude of the obtained multiple current values, and obtaining the target color temperature according to the Grassmann law.
In the technical scheme of the embodiment of the invention, the corresponding relation between the color brightness and the corresponding current is generated in advance, the target color coordinate and the target brightness are received, the target color is taken as a calibration object, and the corresponding brightness of each color in the formed target color, namely the multiple brightness, is determined according to the target color coordinate and the target brightness. And comparing the multiple brightness with the corresponding relation between the color brightness and the corresponding current magnitude generated in advance to obtain the corresponding current value, namely the multiple current value, calibrating the corresponding light-emitting device according to the multiple current value to ensure that the light-emitting brightness is the same, further effectively calibrating the color temperature, improving the calibration accuracy and meeting the use requirement.
Referring to fig. 2, a second embodiment of the present invention is proposed on the basis of the first embodiment proposed by the present invention, the target color comprises white, the target color consists of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing the red color, a second luminance representing the green color and a third luminance representing the blue color.
The step S20 of matching out multiple luminances corresponding to the target color coordinates and the target luminance includes:
in step S21, a first luminance, a second luminance, and a third luminance are matched to match the target color coordinates and the target luminance.
The three colors of red, green and blue are three primary colors for forming white, and the three colors are mixed according to a certain proportion to form white light. The numerical value of the target brightness is equal to the sum of the first brightness, the second brightness and the third brightness, the three colors are determined to be red, green and blue, corresponding color coordinates are also determined, and the first brightness, the second brightness and the third brightness can be determined according to the Grassmann's law forming the target color coordinates and the target brightness.
The step S30 of obtaining multiple current values by comparing the multiple luminances and the corresponding relations according to the pre-stored corresponding relations between the color luminances and the currents includes:
step S31, according to the corresponding relation between the pre-stored color brightness and current, the first brightness, the second brightness and the third brightness are respectively combined and compared with the corresponding relation to obtain a first current value, a second current value and a third current value; the first current value corresponds to a first brightness, the second current value corresponds to a second brightness, and the third current value corresponds to a third brightness.
Therefore, the multiple luminances correspond to corresponding multiple current values. The magnitude of the luminance is determined by the current value. That is, the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness. Various color displays can also be formed by the light emitting devices of three colors of red, green and blue.
Of course, the multiple brightness corresponding to the present application may also be two or more than three color brightness.
Referring to fig. 3, a third embodiment of the present invention is proposed on the basis of the second embodiment proposed by the present invention, a red color corresponds to a first color coordinate representing its color, a green color corresponds to a second color coordinate representing its color, and a blue color corresponds to a third color coordinate representing its color.
Before the step S21 of matching the first luminance, the second luminance, and the third luminance that match the target color coordinates and the target luminance, the method includes:
step S50, generating a target color coordinate and a generating relation between the target brightness and the first brightness, the second brightness and the third brightness, and the first color coordinate, the second color coordinate and the third color coordinate; specifically, according to the grassmann's law, the target color coordinate and the target luminance of the target color are obtained by the first luminance, the second luminance, the third luminance, and the first color coordinate, the second color coordinate, and the third color coordinate, and the generation relationship is further calculated by the relationship.
The step S21 of matching the first luminance, the second luminance, and the third luminance that match the target color coordinates and the target luminance includes:
step S210, matching a first brightness, a second brightness and a third brightness according with the target color coordinate and the target brightness according to the generation relation.
By generating the relationship, it can be known that the generated relationship includes at least four variables, i.e., the target color coordinate, the target luminance, the multiple luminance, and the multiple current value, and in the case where three variables are known, another unknown variable can be estimated. Therefore, under the condition that three colors of red, green and blue are known, in order to obtain the target color coordinate and the target brightness, multiple brightness can be calculated, wherein the multiple brightness comprises the first brightness, the second brightness and the third brightness. The sum of the first brightness, the second brightness and the third brightness is equal to the target brightness, then the first brightness, the second brightness and the third brightness are obtained, each brightness value corresponds to a current value, and the brightness values of the first brightness, the second brightness and the third brightness are guaranteed by setting the current value of the light-emitting device, so that color calibration is completed.
In a fourth embodiment of the present invention, the target color coordinate is (x)m，ym) Target luminance is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) And the third brightness is (x)b，yb) The first brightness is LrA second brightness of LgAnd the third brightness is LbThen the relationship is generated as
Figure BDA0002456395390000091
From the above formula, the target color coordinate is (x) when the three colors of red, green and blue are knownm，ym) Target luminance is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) And the third brightness is (x)b，yb) Are all known values, and the target brightness is LmIs the first brightness of LrA second brightness of LgAnd the third brightness is LbIn the embodiment of the invention, the mixing of the three colors into white is completed by the lighting time of the light-emitting devices with different colors, namely, the red light-emitting device is controlled to be lighted and then turned off within a certain time, the green light-emitting device is controlled to be lighted and then turned off, the blue light-emitting device is controlled to be lighted and then turned off, the light-emitting device with one color is lighted within the same time, the lighting time of the three colors is fixed, on the basis, the brightness display of the three colors is controlled and adjusted to be in accordance with the formula, and the first brightness which is in accordance with the formula is recorded as LrA second brightness of LgAnd the third brightness is LbThe brightness value of the light-emitting device is determined according to the corresponding relation between the color brightness and the current, and the brightness of each color light-emitting device is set according to the current value.
Referring to fig. 4, on the basis of any one of the first to fourth embodiments of the present invention, a fifth embodiment of the present invention is provided, which includes, before the step S30 of obtaining multiple current values by combining and comparing multiple luminances and corresponding relations according to pre-stored corresponding relations between color luminances and currents, the steps of:
step S60, obtaining a partial current value corresponding to partial color brightness by carrying out ascending value or descending value on the current value from small to large; that is, the current can take on two modes, from small to large or from large to small. Generally, the correspondence between the current and the color brightness is linear, so that the color brightness corresponding to the rest of the current values can be deduced by selecting part of the current values.
For example, the multiple brightness includes three colors of red, green and blue, the current value is divided into 1000 steps from 0 to a limited amount, and one current value is taken at every 5 steps, so that 200 sets of current values are obtained for each color, and the total of 600 sets of current values are obtained for the three colors.
In step S70, a partial current value is interpolated to generate a correspondence between color brightness and current, and the correspondence is stored.
The interpolation is a complementary interpolation of a continuous function on the basis of discrete data, such that this continuous curve passes through all given discrete data points. And obtaining the color brightness corresponding to all the current values, wherein the color brightness and the current can be a curve. Or may be a corresponding data table.
Referring to fig. 5, on the basis of the fifth embodiment of the present invention, a sixth embodiment of the present invention is proposed, wherein before the step of matching out the multiple luminances corresponding to the target color coordinates and the target luminance, the method further includes:
step S80, establishing a target color coordinate, a target brightness and a multiple brightness initial comparison table; specifically, the white color coordinates are different under different conditions, that is, the target color coordinates are different under different conditions. For example, daylight color, white coordinates (0.313, 0.337); neutral white with white coordinates (0.346, 0.359); cold white with white coordinates (0.380 ); white with white coordinates (0.409, 0.394); warm white with white coordinates (0.440, 0.443); the color of the incandescent lamp and the white coordinate are (0.463, 0.420), and the multiple brightness values can be quickly determined by establishing an initial comparison table, so that the calibration time is reduced.
The step S20 of matching out multiple luminances corresponding to the target color coordinates and the target luminance includes:
step S200, searching color brightness ratio according to the initial comparison table to obtain multiple brightness according with the target color coordinate and the target brightness.
Specifically, a color brightness ratio range value is set based on the initial comparison table, and multiple brightness corresponding to the color brightness is searched in the range value. Thereby enabling a fast determination of the corresponding multiple luminance values. Under the condition that multiple brightness conforming to the standard color coordinate and the target brightness is not searched, the color brightness matching range value is expanded, and matching search is further carried out.
Referring to fig. 6, the present invention further provides a color and temperature calibration apparatus, wherein the color and temperature calibration method is applied to a projection display device, the projection display device includes a plurality of projection display modes, for example, L ED display, D L P display, or L BS display, the color temperature is used to represent the content of color components in light, and generally in chromaticity coordinates, the color temperature is represented by color coordinates, i.e., the color temperature is calculated by the color coordinates.
A receiving module 10 for receiving a target color coordinate representing a target color and a target brightness; the target color is a target of the calibrated color, the target color comprising colored coordinates, i.e. target color coordinates. The target color also includes a target of brightness, i.e., a target brightness. It will be appreciated that the target color coordinates reflect the type of color displayed. That is, the color temperature can be calculated by the target color coordinates, and then the position of the target color in the chromaticity diagram is obtained. The target luminance reflects the brightness of a color, and generally, the unit of the target luminance includes lumens (lm).
The chromaticity diagram is a plane diagram of a functional expression of a blackbody locus in chromaticity, and the change of different temperatures of a blackbody forms an arc locus on the chromaticity diagram, and the locus is called the blackbody locus. And establishing a plane coordinate system with the horizontal axis as the x axis and the vertical axis as the y axis, and obtaining the position of the target color in the chromaticity diagram by determining the horizontal coordinate and the vertical coordinate.
A matching module 20 for matching multiple luminances in accordance with the target color coordinates and the target luminance; generally, the colors of light forming the target color include a plurality of colors. The glasman law is the law of additive mixing of colored light. The method specifically comprises the following steps: (1) color-complementing law, which means that any one color has another color mixed with it to generate white and grey; (2) the color space law means that any two non-complementary colors are mixed to generate a new mixed color or a middle color between the two mixed colors; (3) substitution law means that colors produced by mixing any different colors can be mutually substituted; (4) a brightness addition law, which means that the total brightness of the mixed color is the sum of the brightness of each color constituting the mixed color; (5) human vision can only distinguish three changes of lightness, hue and saturation of color. These rules apply only to the additive mixing of color shades and not to the mixing of pigments. It is known from the grassmann law that a plurality of light colors form a target color, that is, multiple color coordinates and multiple brightness of the plurality of light colors form a target color coordinate and a target brightness. Similarly, the multiple brightness can be calculated through the target color coordinate, the target brightness and the multiple color coordinate, and the brightness and darkness of the light-emitting device are generally influenced by the current magnitude. I.e. the corresponding current is deduced from the brightness. And then the corresponding light emitting device is calibrated by current.
A storage module 30, configured to store a corresponding relationship between color brightness and current; for example, a memory, and stores the generated correspondence in the storage module 30.
The comparison module 40 is used for combining and comparing the multiple brightness and the corresponding relation to obtain multiple current values according to the corresponding relation of the pre-stored color brightness and current; generally, brightness and darkness of multiple brightness are affected by current, the current is large, the number of emitted light rays of corresponding light emitting devices is increased, and an image is brighter. The current is small, the emission light of the corresponding light emitting device becomes less, and the calibration time can be saved by generating the corresponding relation between the color brightness and the current in advance.
The calibration module 50 is used for calibrating the color temperature according to the multiple current values. The multiple luminance corresponds to multiple current values, the multiple luminance refers to luminance of a plurality of colors included in the formed target luminance, and the multiple current values refer to current values corresponding to the luminance of the plurality of colors. And calibrating the brightness of the light-emitting device by determining the magnitude of the obtained multiple current values, and obtaining the target color temperature according to the Grassmann law.
In the technical scheme of the embodiment of the invention, the corresponding relation between the color brightness and the corresponding current is generated in advance, the target color coordinate and the target brightness are received, the target color is taken as a calibration object, and the corresponding brightness of each color in the formed target color, namely the multiple brightness, is determined according to the target color coordinate and the target brightness. And comparing the multiple brightness with the corresponding relation between the color brightness and the corresponding current magnitude generated in advance to obtain the corresponding current value, namely the multiple current value, calibrating the corresponding light-emitting device according to the multiple current value to ensure that the light-emitting brightness is the same, further effectively calibrating the color temperature, improving the calibration accuracy and meeting the use requirement.
Further, the target color comprises white, the target color consists of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing the red color, a second luminance representing the green color and a third luminance representing the blue color;
the matching module 20 is further configured to match a first luminance, a second luminance, and a third luminance that meet the target color coordinate and the target luminance; the three colors of red, green and blue are three primary colors for forming white, and the three colors are mixed according to a certain proportion to form white light. The numerical value of the target brightness is equal to the sum of the first brightness, the second brightness and the third brightness, the three colors are determined to be red, green and blue, corresponding color coordinates are also determined, and the first brightness, the second brightness and the third brightness can be determined according to the Grassmann's law forming the target color coordinates and the target brightness.
The comparison module 40 is further configured to compare the first brightness, the second brightness, and the third brightness with the corresponding relationship respectively according to the pre-stored corresponding relationship between the color brightness and the current, so as to obtain a first current value, a second current value, and a third current value; the first current value corresponds to a first brightness, the second current value corresponds to a second brightness, and the third current value corresponds to a third brightness. Therefore, the multiple luminances correspond to corresponding multiple current values. The magnitude of the luminance is determined by the current value. That is, the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness. Various color displays can also be formed by the light emitting devices of three colors of red, green and blue.
Of course, the multiple brightness corresponding to the present application may also be two or more than three color brightness.
Furthermore, the red color corresponds to a first color coordinate representing the color of the red color, the green color corresponds to a second color coordinate representing the color of the green color, and the blue color corresponds to a third color coordinate representing the color of the blue color;
the device comprises:
a generating module 60, configured to generate a target color coordinate and a generating relationship between the target luminance and the first luminance, the second luminance and the third luminance, and between the first color coordinate, the second color coordinate and the third color coordinate; specifically, according to the grassmann's law, the target color coordinate and the target luminance of the target color are obtained by the first luminance, the second luminance, the third luminance, and the first color coordinate, the second color coordinate, and the third color coordinate, and the generation relationship is further calculated by the relationship.
The matching module 20 is further configured to match the first luminance, the second luminance, and the third luminance according to the target color coordinate and the target luminance according to the generation relationship. By generating the relationship, it can be known that the generated relationship includes at least four variables, i.e., the target color coordinate, the target luminance, the multiple luminance, and the multiple current value, and in the case where three variables are known, another unknown variable can be estimated. Therefore, under the condition that three colors of red, green and blue are known, in order to obtain the target color coordinate and the target brightness, multiple brightness can be calculated, wherein the multiple brightness comprises the first brightness, the second brightness and the third brightness. The sum of the first brightness, the second brightness and the third brightness is equal to the target brightness, then the first brightness, the second brightness and the third brightness are obtained, each brightness value corresponds to a current value, and the brightness values of the first brightness, the second brightness and the third brightness are guaranteed by setting the current value of the light-emitting device, so that color calibration is completed.
Further, the target color coordinate is (x)m，ym) Target luminance is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) And the third brightness is (x)b，yb) The first brightness is LrA second brightness of LgAnd the third brightness is Lb The generating module 60 is also used for
Figure BDA0002456395390000141
From the above formula, the target color coordinate is (x) when the three colors of red, green and blue are knownm，ym) Target luminance is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) And the third brightness is (x)b，yb) Are all known values, and the target brightness is LmIs the first brightness of LrA second brightness of LgAnd the third brightness is LbIn the embodiment of the invention, the mixing of the three colors into white is completed by the lighting time of the light-emitting devices with different colors, namely, the red light-emitting device is controlled to be lighted and then turned off within a certain time, the green light-emitting device is controlled to be lighted and then turned off, the blue light-emitting device is controlled to be lighted and then turned off, the light-emitting device with one color is lighted within the same time, the lighting time of the three colors is fixed, on the basis, the brightness display of the three colors is controlled and adjusted to be in accordance with the formula, and the first brightness which is in accordance with the formula is recorded as LrA second brightness of LgAnd the third brightness is LbThe brightness value of the light-emitting device is determined according to the corresponding relation between the color brightness and the current, and the brightness of each color light-emitting device is set according to the current value.
Further, the color temperature calibration apparatus further includes:
the value taking module 70 is configured to take a value from small to large according to an ascending order, or take a value from large to small according to a descending order, so as to obtain a partial current value corresponding to partial color brightness; that is, the current can take on two modes, from small to large or from large to small. Generally, the correspondence between the current and the color brightness is linear, so that the color brightness corresponding to the rest of the current values can be deduced by selecting part of the current values.
For example, the multiple brightness includes three colors of red, green and blue, the current value is divided into 1000 steps from 0 to a limited amount, and one current value is taken at every 5 steps, so that 200 sets of current values are obtained for each color, and the total of 600 sets of current values are obtained for the three colors.
The interpolation module 80 is configured to perform interpolation processing on a part of the current values, generate a corresponding relationship between color brightness and current, and store the corresponding relationship. The interpolation is a complementary interpolation of a continuous function on the basis of discrete data, such that this continuous curve passes through all given discrete data points. And obtaining the color brightness corresponding to all the current values, wherein the color brightness and the current can be a curve. Or may be a corresponding data table.
Further, the color temperature calibration apparatus further includes:
and the establishing module 90 is used for establishing a target color coordinate, a target brightness and a multiple brightness initial comparison table. Specifically, the white color coordinates are different under different conditions, that is, the target color coordinates are different under different conditions. For example, daylight color, white coordinates (0.313, 0.337); neutral white with white coordinates (0.346, 0.359); cold white with white coordinates (0.380 ); white with white coordinates (0.409, 0.394); warm white with white coordinates (0.440, 0.443); the color of the incandescent lamp and the white coordinate are (0.463, 0.420), and the multiple brightness values can be quickly determined by establishing an initial comparison table, so that the calibration time is reduced.
The matching module 20 is further configured to perform color-luminance matching search according to the initial comparison table to obtain multiple luminances corresponding to the target color coordinate and the target luminance.
Specifically, a color brightness ratio range value is set based on the initial comparison table, and multiple brightness corresponding to the color brightness is searched in the range value. Thereby enabling a fast determination of the corresponding multiple luminance values. Under the condition that multiple brightness conforming to the standard color coordinate and the target brightness is not searched, the color brightness matching range value is expanded, and matching search is further carried out.
The present invention also provides a projection display apparatus, including: a memory, a processor, and a color temperature calibration program stored on the memory and executable on the processor; the color temperature calibration program when executed by the processor implements the steps of the color temperature calibration method as described above.
The detailed embodiments of the projection display device of the present invention may refer to the embodiments of the color temperature calibration method, which are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A method of color temperature calibration, the method comprising:
receiving a target color coordinate representing a target color and a target brightness;
matching multiple brightness according with the target color coordinate and the target brightness;
according to the corresponding relation between the pre-stored color brightness and the current, combining the multiple brightness and the corresponding relation for comparison to obtain multiple current values;
and calibrating the color temperature according to the multiple current values.
2. The color temperature calibration method according to claim 1, wherein the target color comprises white, the target color is composed of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing a red color, a second luminance representing a green color and a third luminance representing a blue color;
the step of matching out multiple luminances that meet the target color coordinates and the target luminance includes:
matching the first brightness, the second brightness and the third brightness which accord with the target color coordinate and the target brightness;
the step of obtaining multiple current values by combining and contrasting the multiple brightness and the corresponding relation according to the corresponding relation between the pre-stored color brightness and the current comprises the following steps:
according to the corresponding relation between the pre-stored color brightness and the current, the first brightness, the second brightness and the third brightness are respectively combined and contrasted with the corresponding relation to obtain a first current value, a second current value and a third current value; the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness.
3. The color temperature calibration method according to claim 2, wherein the red color corresponds to a first color coordinate representing a color thereof, the green color corresponds to a second color coordinate representing a color thereof, and the blue color corresponds to a third color coordinate representing a color thereof;
before the step of matching the first brightness, the second brightness and the third brightness which meet the target color coordinate and the target brightness, the method comprises the following steps:
generating generation relations between the target color coordinate and the target brightness and the first brightness, the second brightness and the third brightness, and the first color coordinate, the second color coordinate and the third color coordinate;
the step of matching the first luminance, the second luminance, and the third luminance that meet the target color coordinate and the target luminance includes:
and matching the first brightness, the second brightness and the third brightness which accord with the target color coordinate and the target brightness according to the generation relation.
4. The color temperature calibration method according to claim 3, wherein the target color coordinate is (x)m，ym) The target brightness is LmThe first brightness is (x)r，yr) The second brightness is (x)g，yg) The third brightness is (x)b，yb) The first brightness is LrThe second brightness is LgAnd the third brightness is LbThen the generation relationship is
Figure FDA0002456395380000021
5. The color temperature calibration method according to any one of claims 1 to 4, wherein the step of obtaining multiple current values by comparing the multiple luminances and the corresponding relations according to the pre-stored corresponding relations between color luminances and currents comprises:
obtaining a partial current value corresponding to partial color brightness by carrying out ascending value or descending value on the current value from small to large;
and carrying out interpolation processing on the partial current values to generate a corresponding relation between color brightness and current, and storing the corresponding relation.
6. The color temperature calibration method of claim 5, wherein the step of matching out multiple luminances corresponding to the target color coordinates and the target luminance further comprises:
establishing the target color coordinate, the target brightness and the multiple brightness initial comparison table;
the step of matching out multiple luminances that meet the target color coordinates and the target luminance includes:
and searching the color brightness ratio according to the initial comparison table to obtain multiple brightness which accords with the target color coordinate and the target brightness.
7. A color temperature calibration apparatus, the apparatus comprising:
a receiving module for receiving a target color coordinate representing a target color and a target brightness;
the matching module is used for matching multiple luminances according with the target color coordinate and the target luminance;
the storage module is used for storing the corresponding relation between the color brightness and the current;
the comparison module is used for combining and comparing the multiple brightness and the corresponding relation to obtain multiple current values according to the corresponding relation of the pre-stored color brightness and current;
and the calibration module is used for calibrating the color temperature according to the multiple current values.
8. The color temperature calibration apparatus according to claim 7, wherein the target color comprises white, the target color is composed of three colors of red, green and blue, and the multiple luminances comprise a first luminance representing a red color, a second luminance representing a green color and a third luminance representing a blue color;
the matching module is further configured to match the first brightness, the second brightness, and the third brightness that meet the target color coordinate and the target brightness;
the comparison module is further configured to compare the first brightness, the second brightness and the third brightness with the corresponding relationship respectively according to a pre-stored corresponding relationship between color brightness and current to obtain a first current value, a second current value and a third current value; the first current value corresponds to the first brightness, the second current value corresponds to the second brightness, and the third current value corresponds to the third brightness.
9. The color temperature calibration apparatus according to claim 8, wherein the red color corresponds to a first color coordinate representing a color thereof, the green color corresponds to a second color coordinate representing a color thereof, and the blue color corresponds to a third color coordinate representing a color thereof;
the device comprises:
a generating module, configured to generate generation relationships between the target color coordinate and the target luminance and the first luminance, the second luminance and the third luminance, and the first color coordinate, the second color coordinate and the third color coordinate;
the matching module is further configured to match the first brightness, the second brightness, and the third brightness that meet the target color coordinate and the target brightness according to the generation relationship.
10. A projection display device, characterized in that the projection display device comprises: a memory, a processor, and a color temperature calibration program stored on the memory and executable on the processor; the color temperature calibration program when executed by the processor implements the steps of the color temperature calibration method of any one of claims 1 to 6.
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