CN112738488B - Projection equipment control method, device, medium and electronic equipment - Google Patents
Projection equipment control method, device, medium and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The disclosure relates to a projection device control method, a projection device control apparatus, a medium and an electronic device. The method comprises the following steps: in response to receiving the projection instruction, controlling the projection equipment to project pure white light to the projection surface; acquiring color values of diffuse reflection light formed by diffuse reflection of pure white light and ambient light through a projection surface; determining a gain coefficient of an RGB channel in the projection equipment according to the color value; and adjusting the gain of the RGB channel according to the gain coefficient. Because the color value of the diffuse reflection light of the projection surface not only contains the characteristics of the projection light source of the projection equipment, but also contains the characteristics of the projection surface and the environment light, the gain coefficient of the RGB channel in the projection equipment can be accurately calculated, and then the gain of the RGB channel is adjusted according to the gain coefficient, so that the accurate compensation of the color temperature of the projection light source is realized. Therefore, no matter how the ambient light and the projection surface are changed, the color temperature of the projection picture is always kept within a preset value or range, and therefore the optimal impression experience is provided for users.
Description
Technical Field
The present disclosure relates to the field of projection devices, and in particular, to a projection device control method, apparatus, medium, and electronic device.
Background
The projection equipment displays the picture to a user through a diffuse reflection principle, wherein ambient light can form diffuse reflection on a projection plane and enter human eyes together with the diffuse reflection light of the light projected by the projection equipment, so that the color temperature of the displayed picture is influenced. In addition, when a user uses the projection apparatus, the user usually projects a picture on a wall surface or a curtain, and the wall surface or the curtain has various materials, microstructures and colors, which affect the absorption rate and the reflectivity of light with different wavelengths, thereby affecting the color temperature of the picture. Therefore, the influence of the ambient light and the projection plane on the viewing experience is very large, and therefore, how to adaptively adjust the color temperature of the projection equipment according to the current ambient condition plays an important role in improving the viewing experience of the user.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a projection device control method, apparatus, medium, and electronic device.
In order to achieve the above object, in a first aspect, the present disclosure provides a projection apparatus control method, including:
in response to receiving a projection instruction, controlling the projection equipment to project pure white light to a projection surface;
acquiring color values of diffuse reflection light formed by diffuse reflection of the pure white light and the ambient light through the projection surface;
determining a gain coefficient of an RGB channel in the projection equipment according to the color value;
and adjusting the gain of the RGB channel according to the gain coefficient.
Optionally, the determining, according to the color values, gain coefficients of RGB channels in the projection device includes:
respectively determining a target color temperature and a target compensation color cast of the projection equipment according to the color values;
determining a target chromaticity coordinate of a projection light source of the projection equipment in an XYZ color space according to the target color temperature and the target compensation color cast;
and determining the gain coefficient according to a preset color lookup table and the target chromaticity coordinate.
Optionally, the determining, according to the color values, a target color temperature and a target compensation color shift of the projection device respectively includes:
determining a first chromaticity coordinate of the diffuse reflected light in the XYZ color space according to the color value;
determining the correlated color temperature of the diffuse reflection light according to the first chromaticity coordinate;
determining the target color temperature according to the correlated color temperature;
mapping the first chromaticity coordinate to a uniform color space to obtain a second chromaticity coordinate;
and determining the target compensation color cast according to the correlated color temperature and the second chromaticity coordinate.
Optionally, the determining the target compensation color shift according to the correlated color temperature and the second chromaticity coordinate includes:
determining a first intersection coordinate of the black body locus in the uniform color space and an isotherm of the correlated color temperature;
determining the distance between the first intersection point coordinate and the second chromaticity coordinate as the color cast to be compensated;
and acquiring target compensation intensity, and performing enhancement compensation on the color cast to be compensated according to the target compensation intensity to obtain the target compensation color cast.
Optionally, the determining a target chromaticity coordinate of a projection light source of the projection apparatus in an XYZ color space according to the target color temperature and the target compensation color shift includes:
determining a third chromaticity coordinate of the projection light source in the uniform color space according to the target color temperature and the target compensation color cast;
mapping the third chromaticity coordinate into the XYZ color space to obtain the target chromaticity coordinate.
Optionally, the determining a third chromaticity coordinate of the projection light source in the uniform color space according to the target color temperature and the target compensation color shift includes:
determining a second intersection point coordinate of the black body locus in the uniform color space and the isotherm of the target color temperature;
and determining the third chroma coordinate according to the second intersection point coordinate and the target compensation color cast.
Optionally, before the step of determining gain coefficients of RGB channels in the projection device according to the color values, the method further includes:
acquiring infrared spectrum information of the diffuse reflection light;
correcting the color value according to the infrared spectrum information;
determining a gain coefficient of an RGB channel in the projection device according to the color value, including:
and determining the gain coefficient of the RGB channel in the projection equipment according to the corrected color value.
Optionally, the correcting the color value according to the infrared spectrum information includes:
acquiring a first correction matrix and a second correction matrix, wherein the first correction matrix is determined according to a measurement result under a standard light source with an infrared component larger than a first preset proportion threshold value, the second correction matrix is determined according to a measurement result under a standard light source with an infrared component smaller than a second preset proportion threshold value, and the first preset proportion threshold value is larger than the second preset proportion threshold value;
and determining the color value obtained after correction according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected, wherein the matrix to be corrected is a column vector formed by the color value and the infrared spectrum information.
In a second aspect, the present disclosure provides a projection device control apparatus, the apparatus comprising:
the control module is used for responding to the received projection instruction and controlling the projection equipment to project pure white light to the projection surface;
the acquisition module is used for acquiring the color values of diffuse reflection light formed by diffuse reflection of the pure white light and the ambient light through the projection surface;
the determining module is used for determining a gain coefficient of an RGB channel in the projection equipment according to the color value acquired by the acquiring module;
and the adjusting module is used for adjusting the gain of the RGB channel according to the gain coefficient determined by the determining module.
In a third aspect, the present disclosure provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method provided by the first aspect of the present disclosure.
In a fourth aspect, the present disclosure provides an electronic device comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method provided by the first aspect of the present disclosure.
In the technical scheme, when a projection instruction is received, the projection equipment is controlled to project pure white light to the projection surface, and then the color values of diffuse reflection light formed by diffuse reflection of the pure white light and ambient light through the projection surface are obtained; and then, according to the color value, determining a gain coefficient of an RGB channel in the projection equipment, and adjusting the gain of the RGB channel according to the gain coefficient. The color value of the diffuse reflection light of the projection surface not only comprises the characteristics of a projection light source of the projection equipment, but also comprises the characteristics of the projection surface and the characteristics of the ambient light, so that the gain coefficient of an RGB channel in the projection equipment can be accurately calculated, the gain of the RGB channel is adjusted according to the gain coefficient, and the accurate compensation of the color temperature of the projection light source is realized. Therefore, no matter how the ambient light and the projection surface are changed, the color temperature of the projection picture is always kept within a preset value or range, and therefore the optimal impression experience is provided for users.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a method of controlling a projection apparatus according to an exemplary embodiment.
Fig. 2 is a flow chart illustrating a method of determining a gain factor according to an exemplary embodiment.
FIG. 3 is an xy-coordinate diagram of a CIE1931 shown in accordance with an exemplary embodiment.
Fig. 4 is an xy-coordinate diagram of CIE1976, shown in accordance with an exemplary embodiment.
Fig. 5 is a partially enlarged view of the coordinate graph of the uniform color space shown in fig. 4.
Fig. 6 is a flowchart illustrating a method of controlling a projection apparatus according to another exemplary embodiment.
FIG. 7A is a graph illustrating intensity of an infrared light ray versus a weighting factor, according to an exemplary embodiment.
FIG. 7B is a graph illustrating intensity of an infrared ray versus a weighting factor in accordance with another exemplary embodiment.
Fig. 8 is a block diagram illustrating a control apparatus of a projection device according to an exemplary embodiment.
FIG. 9 is a block diagram illustrating an electronic device in accordance with an example embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As discussed in the background, how to adaptively adjust the color temperature of the projection device according to the current environmental conditions plays an important role in improving the user experience. For this reason, the adaptive adjustment of the color temperature of the projection device is mainly realized in the following two ways: (1) the projection light source of the projection equipment is changed according to the ambient light to compensate the color temperature deviation (namely, color deviation), but the characteristics of a projection surface and the projection light source are not considered in the method, so that the problems of over compensation or under compensation easily occur; (2) although the color temperature accuracy of the light source can be accurately controlled by the method, the color temperature compensation cannot be performed on the color cast caused by the ambient light and the projection surface. In view of the above, the present disclosure provides a projection device control method, apparatus, medium, and electronic device.
Fig. 1 is a flowchart illustrating a method of controlling a projection apparatus according to an exemplary embodiment. As shown in fig. 1, the method includes S101 to S104.
In response to receiving the projection instruction, the projection device is controlled to project pure white light to the projection surface in S101.
In the present disclosure, the projection surface may be a wall surface or a curtain made of various materials, and the color of the projection surface may be various colors such as white, pink, and gray.
In S102, color values of diffuse reflection light formed by diffuse reflection of pure white light and ambient light on the projection surface are acquired.
In the present disclosure, the color values may be RGB data or XYZ data in an XYZ color space. The XYZ color space is defined by the International lighting association (CIE) in 1931, and is also called CIE 1931.
After the pure white light is projected onto the projection surface, diffuse reflection can occur, and simultaneously, after the ambient light irradiates on the projection surface, diffuse reflection also can occur, so that the diffuse reflection light of the projection surface is formed by the diffuse reflection of the pure white light projected by the projection equipment and the ambient light through the projection surface, and the color value of the diffuse reflection light not only contains the characteristics of the projection light source of the projection equipment, but also contains the characteristics of the projection surface and the ambient light.
In addition, the diffuse reflection light can be collected through a sensing module facing the projection surface, wherein the sensing module can be a color temperature sensor, a camera and the like, and the sensing module can be integrated in the projection equipment or can be independent of the projection equipment and connected with the projection equipment through a wireless network or a wired network.
In S103, gain coefficients of RGB channels in the projection device are determined based on the color values.
In the present disclosure, the RGB channels include a red (R) channel, a green (G) channel, and a blue (B) channel, so that a gain coefficient of the red (R) channel, a gain coefficient of the green (G) channel, and a gain coefficient of the blue (B) channel can be determined according to color values.
In S104, the gain of the RGB channel is adjusted according to the gain coefficient.
In the present disclosure, when the gain coefficient of the red (R) channel, the gain coefficient of the green (G) channel, and the gain coefficient of the blue (B) channel are determined through S103, the gain of the red (R) channel in the projection apparatus may be adjusted according to the gain coefficient of the red (R) channel, the gain of the green (G) channel in the projection apparatus may be adjusted according to the gain coefficient of the green (G) channel, and the gain of the blue (B) channel in the projection apparatus may be adjusted according to the gain coefficient of the blue (B) channel.
In the technical scheme, when a projection instruction is received, the projection equipment is controlled to project pure white light to the projection surface, and then the color values of diffuse reflection light formed by diffuse reflection of the pure white light and ambient light through the projection surface are obtained; and then, according to the color value, determining a gain coefficient of an RGB channel in the projection equipment, and adjusting the gain of the RGB channel according to the gain coefficient. The color value of the diffuse reflection light of the projection surface not only comprises the characteristics of a projection light source of the projection equipment, but also comprises the characteristics of the projection surface and the characteristics of the ambient light, so that the gain coefficient of an RGB channel in the projection equipment can be accurately calculated, the gain of the RGB channel is adjusted according to the gain coefficient, and the accurate compensation of the color temperature of the projection light source is realized. Therefore, no matter how the ambient light and the projection surface are changed, the color temperature of the projection picture is always kept within a preset value or range, and therefore the optimal impression experience is provided for users.
The following describes a specific embodiment of determining the gain coefficients of the RGB channels in the projection apparatus according to the color values in S103. Specifically, it can be realized by S1031 to S1034 shown in fig. 2.
In S1031, a target color temperature and a target compensation color shift of the projection apparatus are respectively determined according to the color values.
In S1032, a target chromaticity coordinate of the projection light source of the projection apparatus in the XYZ color space is determined from the target color temperature and the target compensation color shift.
In S1033, a gain factor is determined according to a preset color lookup table and a target chromaticity coordinate.
In the present disclosure, the preset color Lookup Table (LuT) may be constructed by:
1) controlling the projection equipment to project pure red light, pure green light and pure blue light to the projection surface in sequence, and measuring the color value of the projection light source of the projection equipment during each projection through standard instruments such as a luminometer, an integrating sphere and the like to obtain the color value (namely red X data X) when the saturation is 100 percentR(N), red Y data YR(N), red Z data ZR(N), X data X of greenG(N), green Y data YG(N), green Z dataG(N), X data of blue color XB(N), blue Y data YB(N), green Z dataB(N), where N is the maximum value of the data level value, e.g., 256, 1024, etc.);
2) since the brightness of the projection light source generally conforms to gamma2.2, the color values of the remaining saturation levels can be calculated based on gamma2.2, so that the color lookup table can be obtained.
For example, the color values of the remaining saturations can be calculated by the following equations (1) to (3):
wherein, XR(IRE) is X data for red with saturation IRE/N, IRE is the data level value, and IRE is [0, N-1 ]]Any integer within the range; y isR(IRE) Y data for red color with saturation IRE/N; zR(IRE) Z data for red with saturation IRE/N; xG(IRE) X data for green with saturation IRE/N; y isG(IRE) green Y data with saturation of IRE/N; zG(IRE) Z data for green with saturation IRE/N; xB(IRE) X data for blue color with saturation IRE/N; y isB(IRE) Y data for blue color with saturation IRE/N; zB(IRE) is Z data for blue color with saturation IRE/N.
Illustratively, N — 1024, the preset color lookup table obtained by the above method is shown in table 1 below:
TABLE 1 color lookup table
| IRE | XR | YR | ZR | XG | YG | ZG | XB | YB | ZB |
| 0 | XR(0) | YR(0) | ZR(0) | XG(0) | YG(0) | ZG(0) | XB(0) | YB(0) | ZB(0) |
| 1 | XR(1) | YR(1) | ZR(1) | XG(1) | YG(1) | ZG(1) | XB(1) | YB(1) | ZB(1) |
| 2 | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| 3 | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| …… | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| …… | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| 1021 | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| 1022 | …… | …… | …… | …… | …… | …… | …… | …… | …… |
| 1023 | XR(1023) | YR(1023) | ZR(1023) | XG(1023) | YG(1023) | ZG(1023) | XB(1023) | YB(1023) | ZB(1023) |
| 1024 | XR(1024) | YR(1024) | ZR(1024) | XG(1024) | YG(1024) | ZG(1024) | XB(1024) | YB(1024) | ZB(1024) |
In addition, if the brightness of the projection light source does not meet gamma2.2, the projection device needs to be controlled to project 90% white light, 80% white light, … …, and 10% white light to the projection surface in sequence, and the color value of the projection light source of the projection device at each projection time is measured by a standard instrument such as an illuminometer and an integrating sphere, and then the color lookup table is obtained by linear interpolation according to all the color values measured by the standard instrument. The specific way of obtaining the color lookup table by using a linear difference is well known to those skilled in the art, and is not described in detail in this disclosure.
The following describes in detail a specific embodiment of determining the gain factor according to the preset color lookup table and the target chromaticity coordinate in S1033:
in the present disclosure, IRE may be usedR、IREG、IREBIn any combination (wherein IRERFor data level values corresponding to red, IRERIs [0, N ]]Any value within the range; IREGFor green corresponding data level values, IREG is [0, N]Any value within the range; IREBFor data level values corresponding to blue, IREBIs [0, N ]]Arbitrary value within the range), respectively, into the following equation (4), find such that (x)w，yw) IRE with minimum distance to target chromaticity coordinateR、IREG、IREBIRE is used hereRmin、IREGmin、IREBminIndicating, then, IRERmindetermining/N as the gain factor for the red channel, IREGmindetermining/N as a green channel gain factor, IREBminthe/N is determined as the gain factor for the blue channel.
A detailed description will be given below of a specific embodiment of determining the target color temperature of the projection apparatus and the target compensation color shift from the color values in S1031, respectively. Specifically, the target color temperature and the target compensation color shift of the projection apparatus may be determined by the following steps 1) to 5):
1) from the color values, a first chromaticity coordinate of the diffuse reflected light in the XYZ color space is determined.
In the present disclosure, a first chromaticity coordinate of the diffuse reflected light in the XYZ color space is determined, i.e. the coordinate of the diffuse reflected light in the xy coordinate diagram of CIE1931 (as shown in fig. 3) is determined, wherein all colors in the xy coordinate diagram of CIE1931 can be represented by x, y coordinates in the coordinate system, according to the color value. The black thick line in fig. 3 is a black body trace, and can be understood as a white trace at different color temperatures. The color temperature on the black body trajectory line is a standard color temperature, a line intersecting the black body trajectory line is an isotherm, wherein each color on the isotherm is the same color temperature, and the other color temperatures are correlated color temperatures except the color temperature on the black body trajectory line which is the standard color temperature. The farther from the black body locus line, the larger the color temperature value is, but the larger the color shift Δ uv, the more serious the color shift appears.
Specifically, the first chromaticity coordinate may be determined in various ways, and in one embodiment, if the color value is RGB data, the color value may be first converted into XYZ data in an XYZ color space, and then the first chromaticity coordinate of the diffuse reflected light in the XYZ color space may be determined from the XYZ data obtained after the conversion.
In another embodiment, if the color values are XYZ data, the first chromaticity coordinates of the diffusely reflected light in the XYZ color space are determined directly therefrom.
For example, the first chromaticity coordinate (x, y) may be determined by the following equation (5):
wherein X is X data in the color values; y is Y data in the color values; z is Z data in the color values.
2) And determining the correlated color temperature of the diffuse reflection light according to the first chromaticity coordinate.
In the present disclosure, an actual light source is not always on the blackbody locus line, and therefore, a concept of Correlated Color Temperature (CCT) is proposed, in which the relative Color Temperature of the light source is represented by the Temperature having the shortest distance on the uniform chromaticity diagram, and also by the K's Temperature. Therefore, two beams of white light with the same color temperature may be one beam of white light which is green and one beam of white light which is purple, and the subjective feeling is only pure white on the black body locus line.
Exemplarily, the above correlated color temperature CCT may be determined by the following equation (6):
wherein a1, a2, a3 and c are all constants.
3) And determining a target color temperature according to the correlated color temperature.
Illustratively, the above-mentioned target color temperature CCT may be determined by the following equation (7) according to the correlated color temperaturecomp：
Wherein M is a constant greater than or equal to 1; biIs constant, i ═ 1, 2, … …, M.
As another example, in order to reserve more significant decimal places for floating point operation to improve the calculation accuracy of the target color temperature, the target color temperature CCT may be determined by the following equation (8)comp：
Wherein CCT1 and CCTcomp1Are all intermediate variables.
4) The first chromaticity coordinate is mapped into a uniform color space to obtain a second chromaticity coordinate.
In the present disclosure, the uniform color space may be the UCS color space of CIE 1976. And, the first chromaticity coordinate may be mapped into the uniform color space according to a mapping relationship between the XYZ color space and the uniform color space, thereby obtaining the second chromaticity coordinate.
Wherein, the mapping relationship is shown in the following equation (9):
5) and determining the target compensation color cast according to the correlated color temperature and the second chromaticity coordinate.
In the present disclosure, the target compensation color shift may be determined by:
first, coordinates of a first intersection point of isotherms of the black body locus and the correlated color temperature in the uniform color space are determined.
In the present disclosure, the blackbody locus line in fig. 3 may be mapped into the uniform color space according to the above mapping relationship, resulting in the curve a shown in fig. 4 (i.e., the blackbody locus in the uniform color space). After the correlated color temperature of the diffuse reflection light is determined through the above step 2), the first intersection point coordinate of the isotherm of the correlated color temperature in the uniform color space and the blackbody locus (i.e., (u) shown in fig. 5) can be calculatedstd′，vstd′))。
And then, determining the distance between the first intersection point coordinate and the second chromaticity coordinate as the color cast to be compensated. Color cast to be compensated
Wherein (u ', v') is a second chromaticity coordinate.
And finally, acquiring target compensation intensity, and performing enhancement compensation on the color cast to be compensated according to the target compensation intensity to obtain the target compensation color cast.
In the uniform color space, since the second chromaticity coordinates (u ', v ') are not on the black body locus line, the color represented by the second chromaticity coordinates (u ', v ') is not a standard white color, and therefore, the target color temperature needs to be shifted in the opposite direction on the black body locus line to offset the color shift, and the target compensation color shift Δ u ' v ' can be obtained by the following equation (10), for example 'comp：
Wherein, YratioCompensating the intensity for the target; c is normalCounting; y is100％WIs the value of Y in the above color values; y isbaseIn a dark environment, when the projection equipment projects pure white light to the projection surface, the obtained pure white light is subjected to diffuse reflection by the projection surface to form a Y value in the color values of the diffuse reflection light.
A detailed description will be given below of a specific embodiment of determining the target chromaticity coordinates of the projection light source of the projection apparatus in the XYZ color space, based on the target color temperature and the target compensation color shift in S1032 above. Specifically, this can be achieved by:
firstly, determining a third chroma coordinate of a projection light source in a uniform color space according to a target color temperature and a target compensation color cast; then, the third chromaticity coordinates are mapped into the XYZ color space to obtain target chromaticity coordinates.
In the present disclosure, the third chromaticity coordinate may be determined by: first, the coordinates of the second intersection point of the isotherms of the blackbody locus and the target color temperature in the uniform color space (i.e., (u) shown in fig. 5) are determined1′，v1')); then, based on the second intersection coordinates and the target compensation color shift, a third chromaticity coordinate is determined (as shown in fig. 5 (u)2′，v2′))
Specifically, the third chromaticity coordinate is determined by the following equation (11) according to the second intersection coordinate and the target compensation color shift:
wherein (u)2′，v2') a third chromaticity coordinate; (u)1′，v1') a second intersection coordinate of isotherms of the black body locus and the target color temperature in the uniform color space; h is the slope (known quantity) of the isotherm of the target color temperature.
After the third chromaticity coordinate is obtained, the third chromaticity coordinate may be mapped to the XYZ color space according to the mapping relationship shown in the above equation (9), thereby obtaining a target chromaticity coordinate.
In the above embodiment, the calculation of the target compensation color cast successively involves an XYZ color space (a non-uniform color space, which is a coordinate system where the color temperature is defined) and a uniform color space (which is a coordinate system conforming to human eye perception), and can improve the accuracy of the target compensation color cast, thereby performing accurate color cast compensation, and conforming to human eye perception more, and further improving the viewing experience of the user.
In addition, the diffuse reflection light collected by the sensing module facing the projection surface not only contains color values, but also comprises infrared spectrum information, when the sensing module is irradiated by infrared light, the sensing module responds within 700nm of the wavelength of the infrared light, and especially when the color value excitation is low and the infrared light excitation is high, the measuring precision of the sensing module on the color values can be greatly influenced. Therefore, the sensing module can be provided with an infrared channel for collecting infrared spectrum information so as to assist in improving the measurement accuracy of the color value. Specifically, as shown in fig. 6, before S103, the method further includes S105 and S106.
In S105, infrared spectral information of the diffuse reflected light is acquired.
In S106, the color value is corrected based on the infrared spectrum information.
In this disclosure, after the projection device is controlled to project pure white light onto the projection surface, in addition to obtaining color values of diffuse reflection light formed by diffuse reflection of the pure white light and ambient light on the projection surface, infrared spectrum information of the diffuse reflection light needs to be obtained at the same time, and then the color values are corrected according to the infrared spectrum information, so that the S103 may determine gain coefficients of RGB channels in the projection device according to the corrected color values.
In the present disclosure, the color value may be corrected in a variety of ways based on the infrared spectral information. In one embodiment, a third correction matrix may be obtained, wherein the third correction matrix is determined according to the measurement result of a single standard light source; and then, determining the color value obtained after correction according to the product of the third correction matrix and the matrix to be corrected, wherein the matrix to be corrected is a column vector formed by the color value and the infrared spectrum information.
For example, the color value obtained after correction may be determined by the following equation (12) according to the product of the third correction matrix and the matrix to be corrected:
wherein the content of the first and second substances,
the corrected color value;
is a matrix to be corrected, wherein IR is infrared spectrum information,
the above color value;
is a third calibration matrix.
The following describes in detail how to determine the third correction matrix.
Specifically, the projection device is controlled to project a standard light source (e.g., any one of D50, D65, TL83, TL84, etc.) to the projection surface; then, acquiring a color value and infrared spectrum information of diffuse reflection light formed by diffuse reflection of the standard light source and ambient light through the projection surface through a sensing module, and measuring the color value of the standard light source projected by the projection surface through standard instruments such as an illuminometer, an integrating sphere and the like; according to the mode, multiple measurements are carried out under different ambient lights, wherein the light sources projected to the projection surface by the projection equipment at each time are consistent, and then fitting is carried out according to the color values and infrared spectrum information of multiple groups of diffuse reflection light measured by the sensing module and the color values of multiple groups of standard light sources measured by the standard instrument to obtain the third calibration matrix.
Illustratively, the color values and infrared spectral information of the sets of diffuse reflected light measured by the sensing module, and the color values of the sets of standard light sources measured by the standard instrument are shown in table 2 below:
TABLE 2 measurement data sheet of sensing module and standard instrument
Fitting is performed according to the measurement data of the sensing module and the measurement data of the standard instrument in the above table 2, so as to obtain a third calibration matrix
In another embodiment, a first correction matrix and a second correction matrix may be obtained, where the first correction matrix is determined according to the measurement result of a standard illuminant (i.e., an illuminant with a high infrared component) whose infrared component is greater than a first preset proportion threshold, and the second correction matrix is determined according to the measurement result of a standard illuminant (i.e., an illuminant with a low infrared component) whose infrared component is less than a second preset proportion threshold, where the first preset proportion threshold is greater than the second preset proportion threshold; and then, according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected, determining the color obtained after correction.
For example, the color value obtained after correction may be determined by the following equation (13) according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected:
wherein the content of the first and second substances,
a second calibration matrix;
is a first correction matrix; weight is a weight coefficient.
Here, the weight coefficient weight may be determined according to the intensity of the infrared ray, and may be determined by a relationship curve between the intensity of the infrared ray and the weight coefficient as shown in fig. 7A or fig. 7B, for example.
The following describes in detail how to determine the first correction matrix.
Specifically, for each standard light source with the infrared component larger than a first preset proportion threshold value, the projection equipment is respectively controlled to project the standard light source to the projection surface; then, acquiring a color value and infrared spectrum information of diffuse reflection light formed by diffuse reflection of the standard light source and ambient light through the projection surface through a sensing module, and measuring the color value of the standard light source projected by the projection surface through standard instruments such as an illuminometer, an integrating sphere and the like; according to the mode, multiple measurements are carried out under different ambient lights, and then fitting is carried out according to the color values and infrared spectrum information of multiple groups of diffuse reflection light measured by the sensing module and the color values of multiple groups of standard light sources with different infrared components larger than a first preset proportion threshold value measured by a standard instrument, so that the first calibration matrix is obtained.
The following describes in detail how to determine the second correction matrix.
Specifically, for each standard light source with the infrared component smaller than a second preset proportion threshold, the projection equipment is respectively controlled to project the standard light source to the projection surface; then, acquiring the color value and infrared spectrum information of diffuse reflection light formed by diffuse reflection of the standard light source and ambient light through the projection surface through a sensing module, and measuring the color value of the standard light source projected by the projection surface through a standard instrument; according to the mode, multiple measurements are carried out under different ambient lights, and then fitting is carried out according to the color values and infrared spectrum information of multiple groups of diffuse reflection light measured by the sensing module and the color values of the standard light source, measured by the standard instrument, of multiple groups of different infrared components smaller than a second preset proportion threshold value, so that the second calibration matrix is obtained.
The first calibration matrix, the second calibration matrix and the third calibration matrix may be predetermined and stored in a corresponding storage module in the projection device, so that the projection device can acquire the first calibration matrix and the second calibration matrix or acquire the third calibration matrix by accessing the storage module, which is convenient and fast, thereby accelerating the efficiency of color temperature adjustment.
In addition, except for adopting the mode of correcting the color value according to the infrared spectrum information, the measuring precision of the color value can be improved by arranging the optical element for filtering infrared light on the sensing module.
Based on the same inventive concept, the disclosure also provides a projection device control device. Fig. 8 is a block diagram illustrating a control apparatus of a projection device according to an exemplary embodiment. As shown in fig. 8, the apparatus 800 includes: the control module 801 is configured to control the projection device to project pure white light to a projection surface in response to receiving a projection instruction; an obtaining module 802, configured to obtain color values of diffuse reflection light formed by diffuse reflection of the pure white light and the ambient light through the projection surface; a determining module 803, configured to determine, according to the color value obtained by the obtaining module 802, a gain coefficient of an RGB channel in the projection apparatus; an adjusting module 804, configured to adjust the gain of the RGB channel according to the gain coefficient determined by the determining module 803.
In the technical scheme, when a projection instruction is received, the projection equipment is controlled to project pure white light to the projection surface, and then the color values of diffuse reflection light formed by diffuse reflection of the pure white light and ambient light through the projection surface are obtained; and then, according to the color value, determining a gain coefficient of an RGB channel in the projection equipment, and adjusting the gain of the RGB channel according to the gain coefficient. The color value of the diffuse reflection light of the projection surface not only comprises the characteristics of a projection light source of the projection equipment, but also comprises the characteristics of the projection surface and the characteristics of the ambient light, so that the gain coefficient of an RGB channel in the projection equipment can be accurately calculated, the gain of the RGB channel is adjusted according to the gain coefficient, and the accurate compensation of the color temperature of the projection light source is realized. Therefore, no matter how the ambient light and the projection surface are changed, the color temperature of the projection picture is always kept within a preset value or range, and therefore the optimal impression experience is provided for users.
Optionally, the determining module 803 includes: the first determining submodule is used for respectively determining the target color temperature and the target compensation color cast of the projection equipment according to the color values; the second determining submodule is used for determining a target chromaticity coordinate of a projection light source of the projection equipment in an XYZ color space according to the target color temperature and the target compensation color cast; and the third determining submodule is used for determining the gain coefficient according to a preset color lookup table and the target chromaticity coordinate.
Optionally, the first determining sub-module includes: a first chromaticity coordinate determination submodule for determining a first chromaticity coordinate of the diffuse reflection light in the XYZ color space, based on the color value; the correlated color temperature determining submodule is used for determining the correlated color temperature of the diffuse reflection light according to the first chromaticity coordinate; the target color temperature determining submodule is used for determining the target color temperature according to the correlated color temperature; the second chromaticity coordinate determination submodule is used for mapping the first chromaticity coordinate to a uniform color space so as to obtain a second chromaticity coordinate; and the target compensation color cast determining submodule is used for determining the target compensation color cast according to the correlated color temperature and the second chromaticity coordinate.
Optionally, the target compensation color shift determination sub-module includes: a first intersection coordinate determination submodule for determining a first intersection coordinate of the black body locus in the uniform color space and the isotherm of the correlated color temperature; the color cast to be compensated determining submodule is used for determining the distance between the first intersection point coordinate and the second chromaticity coordinate as the color cast to be compensated; and the compensation module is used for acquiring target compensation intensity and carrying out enhancement compensation on the color cast to be compensated according to the target compensation intensity so as to obtain the target compensation color cast.
Optionally, the second determining sub-module includes: a third chromaticity coordinate determination submodule, configured to determine a third chromaticity coordinate of the projection light source in the uniform color space according to the target color temperature and the target compensation color shift; a first mapping sub-module, configured to map the third chromaticity coordinate into the XYZ color space to obtain the target chromaticity coordinate.
Optionally, the third chromaticity coordinate determination sub-module includes: a second intersection coordinate determination submodule for determining a second intersection coordinate of the black body locus in the uniform color space and the isotherm of the target color temperature; and the fourth chromaticity coordinate determination submodule is used for determining the third chromaticity coordinate according to the second intersection point coordinate and the target compensation color cast.
Optionally, the apparatus 800 further comprises: an obtaining module, configured to obtain infrared spectrum information of the diffuse reflection light before the determining module 803 determines a gain coefficient of an RGB channel in the projection device according to the color value; the correction module is used for correcting the color value according to the infrared spectrum information; the determining module 803 is configured to determine a gain coefficient of an RGB channel in the projection apparatus according to the color value obtained after the correction.
Optionally, the correction module comprises: the acquisition submodule is used for acquiring a first correction matrix and a second correction matrix, wherein the first correction matrix is determined according to the measurement result under the standard light source with the infrared component larger than a first preset proportion threshold value, the second correction matrix is determined according to the measurement result under the standard light source with the infrared component smaller than a second preset proportion threshold value, and the first preset proportion threshold value is larger than the second preset proportion threshold value; and the color value determining submodule is used for determining the color value obtained after correction according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected, wherein the matrix to be corrected is a column vector formed by the color value and the infrared spectrum information.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described projection apparatus control method provided by the present disclosure.
Fig. 9 is a block diagram illustrating an electronic device 900 in accordance with an example embodiment. As shown in fig. 9, the electronic device 900 may include: a processor 901 and a memory 902. The electronic device 900 may also include one or more of a multimedia component 903, an input/output (I/O) interface 904, and a communications component 905.
The processor 901 is configured to control the overall operation of the electronic device 900, so as to complete all or part of the steps in the above-mentioned projection device control method. The memory 902 is used to store various types of data to support operation of the electronic device 900, such as instructions for any application or method operating on the electronic device 900 and application-related data, such as contact data, transmitted and received messages, pictures, audio, video, and the like. The Memory 902 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The multimedia component 903 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 902 or transmitted through the communication component 905. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 904 provides an interface between the processor 901 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 905 is used for wired or wireless communication between the electronic device 900 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 905 may thus include: Wi-Fi module, Bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic Device 900 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described projection Device control method.
In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions, which when executed by a processor, implement the steps of the projection apparatus control method described above. For example, the computer readable storage medium may be the above-mentioned memory 902 including program instructions that are executable by the processor 901 of the electronic device 900 to perform the above-mentioned projection device control method.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (9)
1. A method for controlling a projection device, the method comprising:
in response to receiving a projection instruction, controlling the projection equipment to project pure white light to a projection surface;
acquiring color values of diffuse reflection light formed by diffuse reflection of the pure white light and the ambient light through the projection surface;
acquiring infrared spectrum information of the diffuse reflection light;
correcting the color value according to the infrared spectrum information;
determining a gain coefficient of an RGB channel in the projection equipment according to the corrected color value;
adjusting the gain of the RGB channel according to the gain coefficient;
and correcting the color value according to the infrared spectrum information, comprising:
acquiring a first correction matrix and a second correction matrix, wherein the first correction matrix is determined according to a measurement result under a standard light source with an infrared component larger than a first preset proportion threshold value, the second correction matrix is determined according to a measurement result under a standard light source with an infrared component smaller than a second preset proportion threshold value, and the first preset proportion threshold value is larger than the second preset proportion threshold value;
and determining the color value obtained after correction according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected, wherein the matrix to be corrected is a column vector formed by the color value and the infrared spectrum information.
2. The method of claim 1, wherein determining gain coefficients for RGB channels in the projection device based on the corrected color values comprises:
respectively determining a target color temperature and a target compensation color cast of the projection equipment according to the corrected color values;
determining a target chromaticity coordinate of a projection light source of the projection equipment in an XYZ color space according to the target color temperature and the target compensation color cast;
and determining the gain coefficient according to a preset color lookup table and the target chromaticity coordinate.
3. The method of claim 2, wherein determining the target color temperature and the target compensation color shift of the projection device respectively according to the corrected color values comprises:
determining a first chromaticity coordinate of the diffuse reflection light in the XYZ color space according to the corrected color value;
determining the correlated color temperature of the diffuse reflection light according to the first chromaticity coordinate;
determining the target color temperature according to the correlated color temperature;
mapping the first chromaticity coordinate to a uniform color space to obtain a second chromaticity coordinate;
and determining the target compensation color cast according to the correlated color temperature and the second chromaticity coordinate.
4. The method of claim 3, wherein determining the target compensated color shift based on the correlated color temperature and the second chromaticity coordinate comprises:
determining a first intersection coordinate of the black body locus in the uniform color space and an isotherm of the correlated color temperature;
determining the distance between the first intersection point coordinate and the second chromaticity coordinate as the color cast to be compensated;
and acquiring target compensation intensity, and performing enhancement compensation on the color cast to be compensated according to the target compensation intensity to obtain the target compensation color cast.
5. The method of claim 2, wherein determining the target chromaticity coordinates of the projection light source of the projection device in the XYZ color space from the target color temperature and the target compensation color shift comprises:
determining a third chromaticity coordinate of the projection light source in a uniform color space according to the target color temperature and the target compensation color cast;
mapping the third chromaticity coordinate into the XYZ color space to obtain the target chromaticity coordinate.
6. The method of claim 5, wherein determining a third chromaticity coordinate of the projection light source in a uniform color space based on the target color temperature and the target compensation color shift comprises:
determining a second intersection point coordinate of the black body locus in the uniform color space and the isotherm of the target color temperature;
and determining the third chroma coordinate according to the second intersection point coordinate and the target compensation color cast.
7. A projection device control apparatus, comprising:
the control module is used for responding to the received projection instruction and controlling the projection equipment to project pure white light to the projection surface;
the acquisition module is used for acquiring the color values of diffuse reflection light formed by diffuse reflection of the pure white light and the ambient light through the projection surface;
a module for acquiring infrared spectrum information of the diffuse reflection light;
the correction module is used for correcting the color value according to the infrared spectrum information;
the determining module is used for determining a gain coefficient of an RGB channel in the projection equipment according to the corrected color value;
the adjusting module is used for adjusting the gain of the RGB channel according to the gain coefficient determined by the determining module;
the correction module includes: the acquisition submodule is used for acquiring a first correction matrix and a second correction matrix, wherein the first correction matrix is determined according to the measurement result under the standard light source with the infrared component larger than a first preset proportion threshold value, the second correction matrix is determined according to the measurement result under the standard light source with the infrared component smaller than a second preset proportion threshold value, and the first preset proportion threshold value is larger than the second preset proportion threshold value; and the color value determining submodule is used for determining the color value obtained after correction according to the product of the first correction matrix and the matrix to be corrected and the product of the second correction matrix and the matrix to be corrected, wherein the matrix to be corrected is a column vector formed by the color value and the infrared spectrum information.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
9. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 6.
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| PCT/CN2021/106115 WO2022134549A1 (en) | 2020-12-23 | 2021-07-13 | Projection device control method and apparatus, and medium and electronic device |
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| CN113259645B (en) * | 2021-06-08 | 2021-10-19 | 深圳市火乐科技发展有限公司 | Color temperature adjusting method and device, computer readable storage medium and projection equipment |
| CN114222098B (en) * | 2021-12-10 | 2023-07-21 | 峰米(北京)科技有限公司 | Gamma curve adjusting method and equipment for projection equipment |
| CN114866753A (en) * | 2022-06-06 | 2022-08-05 | 深圳康佳电子科技有限公司 | Projector image quality adjusting method and device and projector |
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