CN112929620B - Projection device, white balance adjusting method thereof and readable storage medium - Google Patents
Projection device, white balance adjusting method thereof and readable storage medium 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]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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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
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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
- G03B21/206—Control of light source other than position or intensity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
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- Projection Apparatus (AREA)
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Abstract
The invention provides a projection device, a white balance adjusting method thereof and a readable storage medium, wherein a tristimulus value and an initial duty ratio of a light source component in the projection process of the projection device are obtained; acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient; determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values; the projection device is controlled to perform white balance adjustment according to the target duty ratio and the target brightness, namely, the target duty ratio and the target brightness which accord with preset color coordinates are obtained after the red light source in the light source assembly is compensated, and the projection device is controlled to perform white balance adjustment according to the target duty ratio and the target brightness, so that the condition that the projection device has color cast due to the influence of temperature on the red light source is prevented, the white balance adjustment of the projection device is unified, and the efficiency of the white balance adjustment is improved.
Description
Technical Field
The present invention relates to the field of projection apparatuses, and in particular, to a projection apparatus, a white balance adjustment method thereof, and a readable storage medium.
Background
In the field of projection devices, it is common to perform calibration adjustment, i.e., white balance adjustment, on colors formed by the projection device. However, in the process of white balance adjustment, the red light is greatly affected by temperature, so that the color cast of the projection apparatus may occur, the white balance adjustment standard of the projection apparatus is not uniform, and a product with unsatisfactory calibration adjustment is prone to occur.
Disclosure of Invention
The invention mainly aims to provide a projection device, a white balance adjusting method thereof and a readable storage medium, which solve the problem that in the white balance adjusting process of the projection device, a red lamp is greatly influenced by temperature, so that the projection device may have color cast, and the white balance adjusting standard of the projection device is not uniform.
In order to achieve the above object, the present invention provides a white balance adjustment method for a projection apparatus, the projection apparatus having a light source module disposed therein, the white balance adjustment method comprising:
controlling the projection device to carry out projection, and acquiring a tristimulus value and an initial duty ratio of the light source assembly in the projection process of the projection device;
acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient;
determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values;
and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness.
Optionally, before obtaining the tristimulus values and the initial duty ratio of the light source assembly in the projection process of the projection apparatus, the white balance adjustment method of the projection apparatus further includes:
lightening a red light source of the projection device and controlling the projection device to project;
acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device;
and obtaining a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus amount, and taking the compensation coefficient as the preset stimulus amount compensation coefficient.
Optionally, the step of obtaining a temperature variation of the red light source during projection by the projection apparatus, and obtaining a variation of a primary red color stimulus amount of the red light source during projection by the projection apparatus includes:
acquiring the lighting time of the red light source;
when the lighting time of the red light source reaches preset time and the temperature of the red light source reaches preset temperature, acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device.
Optionally, the step of obtaining a temperature variation of the red light source during projection by the projection apparatus, and obtaining a variation of a red primary color stimulus amount of the red light source during projection by the projection apparatus includes:
taking the absolute value of the difference between the preset temperature and the initial temperature when the red light source is turned on as a temperature variation;
and taking the absolute value of the difference value between the real-time primary red color stimulus amount when the temperature of the red light source reaches a preset temperature and the initial primary red color stimulus amount when the red light source is lightened as the variation of the primary red color stimulus amount.
Optionally, the step of obtaining a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus amount includes:
and acquiring a ratio between the temperature variation and the variation of the red primary color stimulus amount, and taking the ratio as the compensation coefficient.
Optionally, the step of compensating the red primary color stimulus amount of the red light source according to a preset stimulus amount compensation coefficient includes:
acquiring the actual temperature of the red light source in the light source assembly when the projection device performs projection;
acquiring the absolute value of the difference between the actual temperature and the initial temperature of the red light source as the temperature difference of the red light source;
obtaining a compensation value according to the temperature difference value of the red light source and the preset stimulation compensation coefficient;
and compensating the red primary color stimulation quantity of the red light source by adopting the compensation value.
In addition, in order to achieve the above object, the present invention further provides a projection apparatus, which includes a memory, a processor, and a white balance adjustment program of the projection apparatus stored in the memory and executable on the processor, wherein the white balance adjustment program of the projection apparatus, when executed by the processor, implements the steps of the white balance adjustment method of the projection apparatus as described above.
Further, to achieve the above object, the present invention also proposes a readable storage medium having stored thereon a white balance adjustment program of a projection apparatus, which when executed by a processor, implements the steps of the white balance adjustment method of the projection apparatus as described above.
The invention provides a projection device, a white balance adjusting method thereof and a readable storage medium, wherein a tristimulus value and an initial duty ratio of a light source component in the projection process of the projection device are obtained; acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient; determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values; the projection device is controlled to carry out white balance adjustment according to the target duty ratio and the target brightness, namely, the target duty ratio and the target brightness which accord with preset color coordinates are obtained after the red light source in the light source assembly is compensated, and the projection device is controlled to carry out white balance adjustment through the target duty ratio and the target brightness, so that the condition that the projection device has color cast due to the fact that the red light source is influenced by temperature is prevented, white balance adjustment of the projection device is unified, and the efficiency of white balance adjustment is improved.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present invention, the drawings used in the embodiments or exemplary descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a projection apparatus according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a white balance adjustment method for a projection apparatus according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a white balance adjustment method for a projection apparatus according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram showing the variation of the stimulus amount of the primary color of red according to the variation trend of the lighting time;
fig. 5 is a schematic diagram of the variation trend of the temperature variation with the lighting time according to the present invention.
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
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the invention is: controlling a projection device to carry out projection, and acquiring a tristimulus value and an initial duty ratio of a light source component in the projection process of the projection device; acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient; determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values; and controlling the projection device to carry out white balance adjustment according to the target duty ratio and the target brightness.
In the prior art, the color formed by the projection device is adjusted in calibration, i.e. the white balance is adjusted. However, in the process of white balance adjustment, the red light is greatly affected by temperature, so that the color cast of the projection apparatus may occur, the white balance adjustment standard of the projection apparatus is not uniform, and a product with unsatisfactory calibration adjustment is prone to occur.
The invention provides a solution, which is characterized in that a projection device is controlled to carry out projection, and the tristimulus values and the initial duty ratio of a light source component in the projection process of the projection device are obtained; acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient; determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values; and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness, namely, compensating a red light source in a light source assembly to obtain the target duty ratio and the target brightness which accord with preset color coordinates, and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness, so that the condition that the projection device has color cast due to the influence of temperature on the red light source is prevented, the white balance adjustment of the projection device is unified, and the white balance adjustment efficiency is improved.
As shown in fig. 1, fig. 1 is a schematic diagram of a hardware operating environment of a projection apparatus according to an embodiment of the present invention.
As shown in fig. 1, the projection apparatus may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), a remote controller, and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (such as a non-volatile memory), such as a disk memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the hardware configuration of the projection device shown in fig. 1 does not constitute a limitation of the projection device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a white balance adjustment program of the projection apparatus.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a white balance adjustment program of the projection apparatus stored in the memory 1005, and perform the following operations:
controlling the projection device to carry out projection, and acquiring a tristimulus value and an initial duty ratio of the light source assembly in the projection process of the projection device;
acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient;
determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values;
and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness.
Further, the processor 1001 may call a white balance adjustment program of the projection apparatus stored in the memory 1005, and also perform the following operations:
lightening a red light source of the projection device and controlling the projection device to project;
acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device;
and obtaining a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus amount, and taking the compensation coefficient as the preset stimulus amount compensation coefficient.
Further, the processor 1001 may call a white balance adjustment program of the projection apparatus stored in the memory 1005, and also perform the following operations:
lightening a red light source of the projection device and controlling the projection device to project;
acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device;
and obtaining a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus amount, and taking the compensation coefficient as the preset stimulus amount compensation coefficient.
Further, the processor 1001 may call a white balance adjustment program of the projection apparatus stored in the memory 1005, and also perform the following operations:
taking the absolute value of the difference between the preset temperature and the initial temperature when the red light source is turned on as a temperature variation;
and taking the absolute value of the difference value between the real-time red primary color stimulus amount when the temperature of the red light source reaches the preset temperature and the initial red primary color stimulus amount when the red light source is lightened as the variation of the red primary color stimulus amount.
Further, the processor 1001 may call a white balance adjustment program of the projection apparatus stored in the memory 1005, and also perform the following operations:
and acquiring a ratio between the temperature variation and the variation of the red primary color stimulus amount, and taking the ratio as the compensation coefficient.
Further, the processor 1001 may call a white balance adjustment program of the projection apparatus stored in the memory 1005, and further perform the following operations:
acquiring the actual temperature of the red light source in the light source assembly when the projection device performs projection;
acquiring the absolute value of the difference between the actual temperature and the initial temperature of the red light source as the temperature difference of the red light source;
acquiring a compensation value according to the temperature difference value of the red light source and the preset stimulation compensation coefficient;
and compensating the red primary color stimulation quantity of the red light source by adopting the compensation value.
The invention provides a white balance adjusting method of a projection device.
Referring to fig. 2, fig. 2 is a flowchart illustrating a white balance adjustment method of a projection apparatus according to a first embodiment of the present invention.
Further, a light source assembly is disposed in the projection apparatus, and the light source assembly includes a red light source, a green light source, and a blue light source, but the light source assembly is not limited to the red light source, the green light source, and the blue light source, for example, the light source assembly may further include a red light source, a green light source, a blue light source, a white light source, and the like, or the light source assembly may further include a combination of a plurality of red light sources, green light sources, and blue light sources, and is not limited herein.
The projection device includes various projection display modes, such as a Light Emitting Diode (LED) display, a Digital Light Processing (DLP) display, a Laser Scanning (LBS) display, and a Liquid Crystal On Silicon (LCOS) display.
Specifically, as shown in fig. 2, the white balance adjustment method of the projection apparatus includes:
s10, controlling the projection device to project, and acquiring a tristimulus value and an initial duty ratio of the light source assembly in the projection process of the projection device;
s20, acquiring the red primary color stimulus quantity of the red light source in the tri-stimulus value, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient;
s30, determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values;
and S40, controlling the projection device to carry out white balance adjustment according to the target duty ratio and the target brightness.
In this embodiment, taking the light source module including a red light source, a green light source, and a blue light source as an example, that is, the tristimulus values of the light source module in this embodiment include tristimulus values of the red light source, the green light source, and the blue light source; and the initial duty cycles (DefaultR, defaultG, defaulttb) of the light source modules include an initial duty cycle of the red light source DefaultR, an initial duty cycle of the green light source DefaultG, and an initial duty cycle of the blue light source defaulttb.
Wherein, the tristimulus values are the amount of the stimulus degrees of three primary colors causing the human retina to feel a certain color, including the amount of red primary color stimulus, the amount of green primary color stimulus and the amount of blue primary color stimulus. That is, in this embodiment, the tristimulus values of the light source module are (RX, RY, RZ; GX, GY, GZ; BX, BY, BZ), wherein the tristimulus values of the red light source are (RX, RY, RZ), the tristimulus values of the green light source are (GX, GY, GZ), and the tristimulus values of the blue light source are (BX, BY, BZ), and X, Y, Z respectively represent the red primary color stimulus amount, the green primary color stimulus amount, and the blue primary color stimulus amount.
Of course, in other embodiments, the light source module includes a white light source in addition to a red light source, a green light source, and a blue light source, and then the tristimulus values of the light source module include the tristimulus values of the red light source, the green light source, the blue light source, and the white light source. Or, the light source module further includes a red light source, a green light source, or a blue light source in addition to the red light source, the green light source, and the blue light source, that is, the tristimulus value of the light source module is correspondingly increased by the tristimulus value of another red light source, another green light source, or another blue light source.
In this embodiment, the projection device is controlled to perform projection, and a tristimulus value and an initial duty ratio of the light source assembly in a projection process of the projection device are obtained. Specifically, the red light source is lightened, the projection device is controlled to perform projection, and a first stimulus value (RX, RY, RZ) and a first duty ratio of the red light source in the projection process of the projection device are obtained; the green light source is lightened, the projection device is controlled to carry out projection, and a second stimulus value (GX, GY, GZ) and a second duty ratio of the green light source in the projection process of the projection device are obtained; and lightening the blue light source, controlling the projection device to project, and acquiring third stimulus values (BX, BY and BZ) and a third duty ratio of the blue light source in the projection process of the projection device.
It will be appreciated that while tristimulus values are obtained for each light source, the other light sources are not illuminated. For example, when the first stimulus value (RX, RY, RZ) is acquired, only the red light source is turned on, and the green light source and the blue light source are not turned on.
After the first stimulus value (RX, RY, RZ), the second stimulus value (GX, GY, GZ) and the third stimulus value (BX, BY, BZ) are obtained, the first stimulus value (RX, RY, RZ), the second stimulus value (GX, GY, GZ) and the third stimulus value (BX, BY, BZ) are used to form the tri-stimulus value (RX, RY, RZ; GX, GY, GZ; BX, BY, BZ) of the light source module, and the first duty cycle, the second duty cycle and the third duty cycle are used to form the initial duty cycle of the light source module.
Further, after the tristimulus values (RX, RY, RZ; GX, GY, GZ; BX, BY, BZ) of the light source assembly are obtained, the red primary color stimulus amount RX of the red light source in the tristimulus values (RX, RY, RZ; GX, GY, GZ; BX, BY, BZ) is obtained, and the red primary color stimulus amount RX of the red light source is compensated according to a preset stimulus amount compensation coefficient.
Specifically, when compensating the red primary color stimulus amount RX of the red light source according to a preset stimulus amount compensation coefficient, obtaining an actual temperature T1 of the red light source in the light source assembly when the projection apparatus performs projection, taking an absolute value of a difference between the actual temperature T1 and an initial temperature T2 of the red light source as a temperature difference value T0 of the red light source, obtaining a compensation value RX0 according to the temperature difference value T0 of the red light source and the preset stimulus amount compensation coefficient KR, and finally compensating the red primary color stimulus amount RX of the red light source by using the compensation value RX0 to obtain a compensated red primary color stimulus amount RX1 of the red light source, that is, the calculation formula of RX1 is as follows:
RX0＝KR*T0；
RX1＝RX+RX0；
in other words, the compensated tristimulus values of the light source module are (RX 1, RY, RZ; GX, GY, GZ; BX, BY, BZ), and target duty ratios (desieddrdc, desieddgdc, desiedbddc) and target luminance desieddy are determined according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values (x, y), where desieddrdc is a target duty ratio of the red light source, desieddgdc is a target duty ratio of the green light source, and desieddbddc is a target duty ratio of the blue light source. In this embodiment, the calculation formulas of the target duty ratios (desiredrdrdc, desiredGDC, desiredbddc) and the target brightness DesiredY are as follows:
that is, based on the above calculation formula, the target duty ratios (DesiredRDC, desiredGDC, desiredbdbdtdc) required for the preset color coordinate values (x, y) and the target luminance DesiredY can be obtained. The preset color coordinate value (x, y) is a color coordinate value currently required by the projection device.
Further, after the target duty ratios (DesiredRDC, desiredGDC, desiredbdbdbcd) and the target brightness DesiredY are obtained, the projection device is controlled to perform white balance adjustment according to the target duty ratios (DesiredRDC, desiredGDC, desiredbdbcd) and the target brightness DesiredY, namely the white coordinate and the brightness of the projection device are adjusted to be close to the target color coordinate and the target brightness, or the white coordinate and the brightness are adjusted to be consistent with the target color coordinate and the target brightness.
In addition, in the embodiment, the projection device is subjected to white balance adjustment through the tristimulus values and the initial duty ratio of the light source assembly, so that the time for preheating due to too low temperature during white coordinate adjustment before the white balance of the conventional projection device is adjusted is reduced, and the efficiency of white balance adjustment is improved.
The invention provides a white balance adjusting method of a projection device, which comprises the steps of firstly controlling the projection device to carry out projection, and acquiring a tristimulus value and an initial duty ratio of a light source component in the projection process of the projection device; acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient; determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values; and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness, namely, compensating a red light source in a light source assembly to obtain the target duty ratio and the target brightness which accord with preset color coordinates, and controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness, so that the condition that the projection device has color cast due to the influence of temperature on the red light source is prevented, the white balance adjustment of the projection device is unified, and the white balance adjustment efficiency is improved.
Further, referring to fig. 3, a second embodiment of the present invention is provided based on the first embodiment, and in this embodiment, before the obtaining the tristimulus values and the initial duty ratios of the light source modules in the projection process of the projection apparatus, the method for adjusting the white balance of the projection apparatus further includes:
s01, lightening a red light source of the projection device, and controlling the projection device to project;
s02, acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device;
and S03, acquiring a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus quantity, and taking the compensation coefficient as the preset stimulus quantity compensation coefficient.
That is, the preset stimulation amount compensation coefficient is acquired before step S10.
Specifically, one projection device is selected from the projection devices in the same batch, wherein the configuration of the projection devices in the same batch is the same. And lighting the red light source of the selected projection device, and controlling the projection device to project, wherein the green light source and the blue light source of the projection device are not lighted at the moment.
After the projection device is used for projection, acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device, so as to acquire a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus quantity, and using the compensation coefficient as the preset stimulus quantity compensation coefficient.
Specifically, after the projection device performs projection, a projection image formed by the projection device is acquired, and tristimulus values (RXi, RYi, RZi) at a central point of the projection image, that is, an initial red primary color stimulus amount RXi at the central point of the projection image is acquired. And acquiring an initial temperature TR0 when the red light source is lighted while acquiring a red primary color stimulus Rxi at a central point of the projected image, wherein at this time, an absolute value of a difference value between a preset temperature TR1 and the initial temperature TR0 when the red light source is lighted is taken as a temperature variation Tn, and an absolute value of a difference value between a real-time red primary color stimulus RXj when the temperature of the red light source reaches the preset temperature TR1 and the initial red primary color stimulus Rxi when the red light source is lighted is taken as a variation RXn of the red primary color stimulus. The preset temperature TR1 is the normal working temperature of the projection device.
That is, when the compensation coefficient is obtained according to the temperature variation Tn and the variation RXn of the red primary color stimulus amount, a ratio between the temperature variation and the variation of the red primary color stimulus amount is obtained, the ratio is used as the compensation coefficient, and the compensation coefficient is used as the preset stimulus amount compensation coefficient in step S20.
Certainly, acquire in the projection arrangement projection process the temperature variation of red light source, and acquire in the projection arrangement projection process in the step of the red primary color stimulus magnitude's of red light source, still need acquire the lighting time t of red light source, and when the lighting time t of red light source reaches preset time and the temperature of red light source reaches preset temperature TR1, the execution is acquireed in the projection arrangement projection process the temperature variation Tn of red light source, and acquire in the projection arrangement projection process the step of the red primary color stimulus magnitude's of red light source variation RXn. Namely, when the temperature of the red light source reaches the preset time and is stabilized at the normal working temperature of the projection device, the real-time primary red color stimulus amount RXj of the red light source can be obtained, so as to obtain the variation of the primary red color stimulus amount of the red light source.
Further, as shown in fig. 4 and 5, the trend of the temperature variation Tn with the lighting time t is opposite to the trend of the variation RXn of the red primary color stimulus amount with the lighting time t.
That is, in the embodiment of the present invention, before the white balance adjustment of the projection apparatus, a preset stimulus amount compensation value of the red light source may be calculated in advance, and when the white balance adjustment of the projection apparatus is performed, the red primary stimulus amount of the red light source may be compensated, so as to avoid a situation that the color shift of the projection apparatus occurs due to the influence of the temperature of the red light source, that is, to improve the accuracy of the white balance adjustment of the projection apparatus.
The invention also provides a projection device, which comprises: a memory, a processor and a white balance adjustment program of a projection device stored on the memory and operable on the processor, wherein the white balance adjustment program of the projection device, when executed by the processor, implements the steps of the white balance adjustment method of the projection device according to the above embodiments.
The present invention further provides a readable storage medium, which stores thereon a white balance adjustment program of a projection apparatus, the white balance adjustment program of the projection apparatus, when executed by a processor, implementing the steps of the white balance adjustment method of the projection apparatus according to any of the above embodiments.
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 description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (such as a ROM/RAM, a magnetic disk, and an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a cloud server, or a network device) to execute the method of the embodiments of the present invention.
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 apparatus 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 apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
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 of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A white balance adjustment method of a projection device is characterized in that a light source component is arranged in the projection device, and the white balance adjustment method of the projection device comprises the following steps:
controlling the projection device to carry out projection, and acquiring a tristimulus value and an initial duty ratio of the light source assembly in the projection process of the projection device;
acquiring the red primary color stimulus quantity of a red light source in the tristimulus values, and compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient;
determining a target duty ratio and target brightness according to the compensated tristimulus values, the initial duty ratio and preset color coordinate values;
controlling the projection device to perform white balance adjustment according to the target duty ratio and the target brightness;
wherein, the step of compensating the red primary color stimulus quantity of the red light source according to a preset stimulus quantity compensation coefficient comprises the following steps:
acquiring the actual temperature of the red light source in the light source assembly when the projection device performs projection;
acquiring the absolute value of the difference between the actual temperature and the initial temperature of the red light source as the temperature difference of the red light source;
acquiring a compensation value according to the temperature difference value of the red light source and the preset stimulation compensation coefficient;
and compensating the red primary color stimulation quantity of the red light source by adopting the compensation value.
2. The method as claimed in claim 1, wherein before the obtaining the tristimulus values and the initial duty ratio of the light source module during the projection process of the projection apparatus, the method further comprises:
lightening a red light source of the projection device and controlling the projection device to project;
acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device;
and acquiring a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus quantity, and taking the compensation coefficient as the preset stimulus quantity compensation coefficient.
3. The white balance adjustment method for a projection apparatus according to claim 2, wherein the step of obtaining the temperature variation of the red light source during projection by the projection apparatus and obtaining the variation of the primary red color stimulus amount of the red light source during projection by the projection apparatus comprises:
acquiring the lighting time of the red light source;
when the lighting time of the red light source reaches preset time and the temperature of the red light source reaches preset temperature, acquiring the temperature variation of the red light source in the projection process of the projection device, and acquiring the variation of the red primary color stimulus quantity of the red light source in the projection process of the projection device.
4. The white balance adjustment method for a projection apparatus according to claim 3, wherein the step of obtaining the temperature variation of the red light source during projection by the projection apparatus and obtaining the variation of the red primary color stimulus amount of the red light source during projection by the projection apparatus comprises:
taking the absolute value of the difference between the preset temperature and the initial temperature when the red light source is turned on as a temperature variation;
and taking the absolute value of the difference value between the real-time red primary color stimulus amount when the temperature of the red light source reaches the preset temperature and the initial red primary color stimulus amount when the red light source is lightened as the variation of the red primary color stimulus amount.
5. The white balance adjustment method for a projection apparatus according to claim 2, wherein the step of obtaining a compensation coefficient according to the temperature variation and the variation of the red primary color stimulus amount comprises:
and acquiring a ratio between the temperature variation and the variation of the red primary color stimulus amount, and taking the ratio as the compensation coefficient.
6. A projection apparatus comprising a memory, a processor, and a white balance adjustment program of the projection apparatus stored in the memory and executable on the processor, wherein the white balance adjustment program of the projection apparatus when executed by the processor implements the steps of the white balance adjustment method of the projection apparatus according to any one of claims 1 to 5.
7. A readable storage medium, on which a white balance adjustment program of a projection apparatus is stored, the white balance adjustment program of the projection apparatus, when executed by a processor, implementing the steps of the white balance adjustment method of the projection apparatus according to any one of claims 1 to 5.
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| CN114339175A (en) * | 2021-12-20 | 2022-04-12 | 歌尔科技有限公司 | Color correction method and apparatus, projector, and storage medium |
| CN114500965B (en) * | 2021-12-28 | 2023-07-25 | 深圳市火乐科技发展有限公司 | Projection device control method and device, readable storage medium and projection device |
| CN114339181A (en) * | 2021-12-29 | 2022-04-12 | 海信视像科技股份有限公司 | Laser projection equipment, projection image adjusting method and device |
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