CN108737806B - Projector color correction method and device and computer storage medium - Google Patents
Projector color correction method and device and computer storage medium Download PDFInfo
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- CN108737806B CN108737806B CN201811004188.1A CN201811004188A CN108737806B CN 108737806 B CN108737806 B CN 108737806B CN 201811004188 A CN201811004188 A CN 201811004188A CN 108737806 B CN108737806 B CN 108737806B
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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
Abstract
The invention discloses a projector color correction method and device and a computer storage medium. The method comprises the following steps: acquiring a target image formed by a first image in a projection area; determining an initial color compensation value for a projection based on the first image and the target image; and calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the image to be projected based on the target color compensation value.
Description
Technical Field
The invention relates to the technical field of projection, in particular to a projector color correction method and device and a computer storage medium.
Background
With the continuous development of the intelligent terminal, a micro projector based on Liquid Crystal On Silicon (LCOS) or Digital Light Processing (DLP) technology can be integrated in the intelligent terminal to meet the requirements of consumers on portability, entertainment, practicability and the like of the intelligent terminal.
In practical application, a user generally uses a white curtain or a white wall as a projection background; however, the cold and warm tones set by the projector can make the image projected to the white curtain or the white wall yellowish, or the projected image is affected when the white curtain or the white wall changes color and has dark clusters and stains; in addition, in real life, the wall color is not necessarily white, which causes color deviation of the image projected on the non-white wall. Therefore, a color correction method for a projector is needed to reduce the interference of the projection background to the projection image and ensure the authenticity of the projection content.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a projector color correction method and apparatus, and a computer storage medium.
The embodiment of the invention provides a projector color correction method, which comprises the following steps:
acquiring a target image formed by a first image in a projection area;
determining an initial color compensation value for a projection based on the first image and the target image;
and calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the image to be projected based on the target color compensation value.
The embodiment of the invention also provides a projector color correction device, which comprises:
the acquisition unit is used for acquiring a target image formed by the first image in the projection area;
a determination unit for determining an initial color compensation value of the projection based on the first image and the target image;
and the processing unit is used for calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value and compensating the projected image based on the target color compensation value.
An embodiment of the present invention further provides a color correction device for a projector, where the device includes: a processor and a memory configured to store a computer program capable of running on the processor,
wherein the processor is configured to execute the steps of the projector color correction method described above when running the computer program.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any of the above methods.
The embodiment of the invention provides a projector color correction method and device and a computer storage medium, and the method comprises the following steps of firstly, collecting a target image formed by a first image in a projection area; determining an initial color compensation value for a projection based on the first image and the target image; calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the projected image based on the target color compensation value; therefore, the acquired target image can be compared with the first image, the difference between the target image and the original image is obtained, the initial color compensation value is obtained, and the initial color compensation value is calibrated; therefore, the color needing to be compensated can be determined according to the projection environment, so that the color of the image projected into the projection area is closer to the color of the real image, the interference of the projection background to the projected image is reduced, the authenticity of the projection content is ensured, and the user experience is improved.
Drawings
Fig. 1 is a schematic structural diagram of a mobile phone with a projector lens according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a color correction method for a projector according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating another method for color correction of a projector according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a color correction apparatus for a projector according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a hardware structure of a color correction apparatus for a projector according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
With the continuous development of mobile terminal technology, no matter how large the display screen is, the requirement of people for the size of the image picture can not be met. People going out are more unlikely to sacrifice portability completely to meet the requirement of large screens, so that the portable and large-screen video and audio entertainment can be provided to the maximum extent only by the simple and feasible imaging mode of projection. At present, a micro projector based on Liquid Crystal On Silicon (LCOS) or Digital Light Processing (DLP) technology can be integrated in an intelligent terminal to meet the requirements of consumers on portability, entertainment, practicability and the like of the intelligent terminal; for example, as shown in fig. 1, a projector lens 101 is disposed at the top end of a mobile device 100 for projection in the prior art.
In general, when a user uses a projector of an intelligent terminal to project, the user directly projects an image on a wall due to lack of a projection environment; however, the difference between the color and the structure of the wall causes the color of the projected image to be different from the actual image. For example, the cold and warm tones set by the projector can make the image projected to the white curtain or the white wall yellowish, or the projected image is affected when the white curtain or the white wall changes color and has dark clusters and stains; in addition, in real life, the wall color is not necessarily white, which causes color deviation of the image projected on the non-white wall.
In order to solve the problem of distortion of a projection image or abnormity of the projection image caused by inconsistent projection backgrounds, the embodiment of the invention provides a projector color correction method, which can determine the color to be compensated according to the projection environment, so that the image projected to a projection area is closer to the color of a real image, the interference of the projection background to the projection image is reduced, the authenticity of projection contents is ensured, and the user experience is improved.
Fig. 2 is a schematic flowchart of a projector color correction method according to an embodiment of the present invention, and as shown in fig. 2, the projector color correction method includes the following steps:
The step 201 of acquiring a target image formed by the first image in the projection area may be implemented by a mobile terminal; in practical application, the mobile terminal can be a mobile electronic device with an image acquisition function; for example, the mobile terminal may be a mobile phone, a tablet computer, a notebook computer, a palm computer, an intelligent wearable device, and the like. In other embodiments of the present invention, as shown in fig. 3, the mobile terminal 30 projects a first image using the projector lens 31; wherein the projector lens 31 may be integrated directly on the flash and located near the camera 32; in this way, when the projector lens 31 performs projection, the projected image can be captured by the camera 32 located near the projector lens 31.
In other embodiments of the present invention, the first image refers to a standard contrast image used in projector color correction; the first image may be any type of image pre-saved in the smart terminal, such as a landscape image, a person image, and the like. Preferably, the first image may be set according to a common wall color.
In addition, the target image is an image formed in a projection area after the first image is projected by the mobile terminal. It is understood that the first image and the target image have the same image content, but since the target image is formed by projecting the target image into the projection area, the colors of the target image and the first image may be deviated due to the influence of the projection environment.
Wherein step 202 determining an initial color compensation value for the projection based on the first image and the target image may be performed by the mobile terminal.
Here, the first image is a standard contrast image, and the target image is an image formed after projection; therefore, the first image is compared with the target image, and the mobile terminal can roughly estimate the color difference between the target image and the first image, so that the influence of pollutants such as background color or dark clusters on the projected image during projection can be known; and determining an initial color compensation value according to the color difference value.
Specifically, because the image contents of the first image and the target image are the same, each pixel point in the first image and the target image has a corresponding relationship; therefore, the mobile terminal can determine the color difference of specific pixel points in the two images by comparing the color information of the corresponding pixel points in the two images; that is to say, by comparing the color information of each pixel point in the first image and the target image, the position where the color information changes can be accurately located, so that the mobile terminal can compensate the color of a specific position.
In practical applications, when the projection background is complex, such as a television background wall, the color compensation value obtained by directly comparing the target image with the first image is not accurate, and the obtained initial color value needs to be adjusted to obtain an accurate color compensation value.
Specifically, the mobile terminal determines initial compensation light according to the initial color compensation value and selects a calibration image; and overlapping the initial compensation light and the calibration image, and projecting the overlapped image into a projection area to form a fifth image. And then the terminal equipment can collect the fifth image, compare the fifth image with the calibration image, and adjust the initial color compensation value to obtain a target color compensation value.
In other embodiments of the present invention, the initial compensation light may be generated by a compensation lens; here, the compensation lens refers to a lens capable of emitting three basic colors. The calibration image is generated by a projection lens, and the projection lens and the compensation lens are independently arranged.
In order to accurately acquire the target color compensation value subsequently and to better realize the color correction of the image to be projected, the calibration image is preferably a pure color picture of red, green and blue. Correspondingly, the fifth image may include an image formed by overlapping the initial compensation light and the red, green, and blue solid-color pictures.
The embodiment of the invention provides a projector color correction method, which comprises the steps of firstly, collecting a target image formed by a first image in a projection area; determining an initial color compensation value for a projection based on the first image and the target image; calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the projected image based on the target color compensation value; therefore, the acquired target image can be compared with the first image, the difference between the target image and the original image is obtained, the initial color compensation value is obtained, and the initial color compensation value is calibrated; therefore, the color needing to be compensated can be determined according to the projection environment, so that the color of the image projected into the projection area is closer to the color of the real image, the interference of the projection background to the projected image is reduced, the authenticity of the projection content is ensured, and the user experience is improved.
Based on the foregoing embodiments, an embodiment of the present invention provides a projector color correction method, as shown in fig. 4, the method includes the following steps:
In other embodiments of the present invention, the color information refers to a color value of each pixel point in the target image; preferably, the color value may be represented by a Red-Green-Blue (RGB) value. In practical applications, the RGB values include three color values of red, green and blue, each having 256 levels of brightness, and different levels can be represented by integers from 0 to 255; thus, various colors can be produced by differently combining the R, G, B values of the three basic colors. For example, the color information of a certain pixel point in the target image may be represented as (R255, G215, B200). Similarly, the initial color information refers to a color value of each pixel point of the first image.
In other embodiments of the present invention, the mobile terminal may internally store initial color information of the first image; preferably, the initial color information may be color information when the first image is projected to the white curtain.
And step 403, the mobile terminal determines a color deviation value between the color information of the target image and the initial color information.
In other embodiments of the present invention, since the image contents of the target image and the first image are the same, there is a corresponding relationship between the pixel points in the target image and the first image; based on this, the mobile terminal can compare the RGB values of the pixel points in the target image with the RGB values of the pixel points at the corresponding positions in the first image according to a certain sequence, and obtain the color difference value of each pixel point. Illustratively, if the color information of the nth pixel point of the target image is (R255, G215, B200), and the color information of the corresponding nth pixel point in the first image is (R240, G200, B215); then, the color difference value of the nth pixel point can be represented as (+ R15, + G15, -B15).
Further, after traversing and comparing all pixel points in the target image with pixel points of the first image, obtaining a color difference value of each pixel point of the target image; and writing the color difference values of all the pixel points into an array, wherein the array is the color deviation value of the first image.
And step 404, the mobile terminal determines a projected initial color compensation value based on the color deviation value.
Specifically, the mobile terminal may determine the initial color compensation value of each pixel point according to the color difference value of each pixel point in the color deviation value. Here, when the initial color compensation value is added to the target image, the RGB value of each pixel point in the target image may be the same as the RGB value of each pixel point in the first image.
In other embodiments of the present invention, the mobile terminal determines initial compensation light according to the initial color compensation value, overlaps the initial compensation light with the red, green, and blue pure color images, respectively, and projects the overlapped images into the projection area.
And step 406, the mobile terminal respectively collects the red, green and blue pure color images and projects the pure color images to a second image, a third image and a fourth image formed in the projection area.
Specifically, the mobile terminal overlaps the initial compensation light with a red pure-color image, projects the overlapped image to a projection area to form a second image, and controls the camera to collect the second image. Then, overlapping the initial compensation light and the green pure-color image, projecting the overlapped image to a projection area to form a third image, and controlling a camera to acquire the third image; and similarly, overlapping the initial compensation light and the blue pure-color image, projecting the overlapped image to a projection area to form a fourth image, and controlling the camera to acquire the fourth image.
It should be noted that, it is an independent process that the mobile terminal overlaps the initial compensation light with the pure color image of a certain color, and collects the image projected into the projection area after the overlap; and the mobile terminal overlaps the initial compensation light with the red, green and blue pure color images and collects the overlapped images in no sequence.
Specifically, after acquiring a second image, a third image and a fourth image, the mobile terminal respectively acquires RGB values of pixel points in the second image, the third image and the fourth image; comparing the RGB value of the pixel point in the second image with the RGB value of the corresponding pixel point in the red pure-color image stored in the mobile terminal to obtain a red difference value; similarly, comparing the RGB value of the pixel point in the third image with the RGB value of the corresponding pixel point in the green pure-color image stored in the mobile terminal to obtain a green difference value; and comparing the RGB value of the pixel point in the fourth image with the RGB value of the corresponding pixel point in the blue pure-color image stored in the mobile terminal to obtain a blue difference value.
Specifically, the mobile terminal adjusts an R value in the initial color compensation value according to the red difference value, adjusts a G value in the initial color compensation value according to the green difference value, and adjusts a B value in the initial color compensation value according to the blue difference value, respectively; and finally, the adjusted initial color compensation value is the target color compensation value.
And step 410, overlapping the image to be projected and the target compensation light, and projecting the overlapped image into a projection area.
Specifically, the target compensation light is projected through a compensation lens; here, the compensation lens refers to a lens capable of emitting three basic colors. The image to be projected is projected through the projection lens, and the projection lens and the compensation lens are independent from each other, that is, the projection lens and the compensation lens are independently arranged.
It should be noted that, for the explanation of the same steps or related concepts in the present embodiment as in the other embodiments, reference may be made to the description in the other embodiments, and details are not described herein again.
The embodiment of the invention provides a projector color correction method, which comprises the steps of firstly, collecting a target image formed by a first image in a projection area; determining an initial color compensation value for a projection based on the first image and the target image; calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the projected image based on the target color compensation value; therefore, the acquired target image can be compared with the first image, the difference between the target image and the original image is obtained, the initial color compensation value is obtained, and the initial color compensation value is calibrated; therefore, the color needing to be compensated can be determined according to the projection environment, so that the color of the image projected into the projection area is closer to the color of the real image, the interference of the projection background to the projected image is reduced, the authenticity of the projection content is ensured, and the user experience is improved.
In order to implement the method of the embodiment of the present invention, an embodiment of the present invention provides a color correction device for a projector, where the device is disposed in a mobile terminal in the above-mentioned embodiment; as shown in fig. 5, the apparatus includes:
an acquisition unit 51 for acquiring a target image formed by the first image in the projection area;
a determining unit 52 for determining an initial color compensation value of the projection based on the first image and the target image;
and the processing unit 53 is configured to calibrate the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensate the projected image based on the target color compensation value.
In other embodiments of the present invention, the determining unit 52 is further configured to obtain color information of a pixel point in the target image; reading initial color information of pixel points in a first image; the initial color information is color information of a pixel point when the first image is projected to a white curtain; determining a color deviation value of the color information of the target image and the initial color information; determining an initial color compensation value for the projection based on the color deviation value.
In other embodiments of the present invention, the processing unit 53 is further configured to project pure color images of red, green and blue colors based on the initial color compensation value;
the collecting unit 51 is further configured to collect a second image, a third image and a fourth image formed by projecting the red, green and blue pure color images into the projection area;
the processing unit 53 is further configured to compare the second image, the third image, and the fourth image with corresponding red, green, and blue pure color pictures, respectively, to obtain a red difference value, a green difference value, and a blue difference value;
the determining unit 52 is further configured to adjust the initial color compensation value based on the red difference value, the green difference value, and the blue difference value, so as to obtain a target color compensation value.
In other embodiments of the present invention, the processing unit 53 is specifically configured to determine the projected target compensation light based on the target color compensation value; and overlapping the image to be projected and the target compensation light, and projecting the overlapped image into a projection area.
In other embodiments of the present invention, the image to be projected is projected through a projection lens; projecting the target compensation light through a compensation lens. And the projection lens and the compensation lens are independent.
The embodiment of the invention provides a projector color correction device, which comprises the following steps of firstly, collecting a target image formed by a first image in a projection area; determining an initial color compensation value for a projection based on the first image and the target image; calibrating the initial color compensation value based on the initial color compensation value to obtain a projected target color compensation value, and compensating the projected image based on the target color compensation value; therefore, the acquired target image can be compared with the first image, the difference between the target image and the original image is obtained, the initial color compensation value is obtained, and the initial color compensation value is calibrated; therefore, the color needing to be compensated can be determined according to the projection environment, so that the color of the image projected into the projection area is closer to the color of the real image, the interference of the projection background to the projected image is reduced, the authenticity of the projection content is ensured, and the user experience is improved.
Based on the hardware implementation of each unit in the projector color correction device, in order to implement the projector color correction method provided in the embodiment of the present invention, an embodiment of the present invention further provides a projector color correction device, as shown in fig. 6, where the device 60 includes: a processor 61 and a memory 62 configured to store computer programs capable of running on the processor,
wherein the processor 61 is configured to perform the method steps of the previous embodiments when running the computer program.
In practice, of course, the various components of the device 60 are coupled together by a bus system 63, as shown in FIG. 6. It will be appreciated that the bus system 73 is used to enable communications among the components. The bus system 63 includes a power bus, a control bus, and a status signal bus in addition to the data bus. For clarity of illustration, however, the various buses are labeled as bus system 63 in FIG. 6.
In an exemplary embodiment, the present invention further provides a computer readable storage medium, such as a memory 62 comprising a computer program, which is executable by a processor 61 of a projector color correction apparatus 60 to perform the steps of the foregoing method. The computer-readable storage medium may be a Memory such as a magnetic random access Memory (FRAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a flash Memory (FlashMemory), a magnetic surface Memory, an optical disk, or a Compact Disc Read-Only Memory (CD-ROM).
The technical schemes described in the embodiments of the present invention can be combined arbitrarily without conflict.
In the embodiments provided in the present invention, it should be understood that the disclosed method and intelligent device may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one second processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A projector color correction method, the method comprising:
acquiring a target image formed by a first image in a projection area;
determining an initial color compensation value for a projection based on the first image and the target image;
determining initial compensation light based on the initial color compensation value, and selecting a calibration image;
overlapping the initial compensation light and the calibration image, and projecting the overlapped image into a projection area to form a fifth image;
and acquiring the fifth image, comparing the fifth image with the calibration image, adjusting the initial color compensation value to obtain a projected target color compensation value, and compensating the image to be projected based on the target color compensation value.
2. The method of claim 1, wherein determining an initial color compensation value for a projection based on the first image and the target image comprises:
acquiring color information of the target image, and reading initial color information of a first image; wherein the initial color information is color information when the first image is projected to a white curtain;
determining a color deviation value of the color information of the target image and the initial color information;
determining an initial color compensation value for the projection based on the color deviation value.
3. The method of claim 1, wherein the adjusting the initial color compensation value to obtain a projected target color compensation value comprises:
projecting pure color images of red, green, and blue based on the initial color compensation values;
respectively collecting a second image, a third image and a fourth image formed by projecting the red, green and blue pure color images into a projection area;
respectively comparing the second image, the third image and the fourth image with corresponding red, green and blue pure color images to obtain a red difference value, a green difference value and a blue difference value;
and adjusting the initial color compensation value based on the red difference value, the green difference value and the blue difference value to obtain a target color compensation value.
4. The method of claim 1, wherein compensating the image to be projected based on the target color compensation value comprises:
determining a projected target compensation light based on the target color compensation value;
and overlapping the image to be projected and the target compensation light, and projecting the overlapped image into a projection area.
5. The method of claim 4, wherein overlapping the image to be projected and the object compensation light and projecting the overlapped image into a projection area comprises:
projecting the image to be projected through a projection lens;
projecting the target compensation light through a compensation lens.
6. The method of claim 5, wherein: the projection lens and the compensation lens are mutually independent.
7. A projector color correction apparatus, the apparatus comprising:
the acquisition unit is used for acquiring a target image formed by the first image in the projection area;
a determination unit for determining an initial color compensation value of the projection based on the first image and the target image;
the processing unit is used for determining initial compensation light based on the initial color compensation value and selecting a calibration image; overlapping the initial compensation light and the calibration image, and projecting the overlapped image into a projection area to form a fifth image; and acquiring the fifth image, comparing the fifth image with the calibration image, adjusting the initial color compensation value to obtain a projected target color compensation value, and compensating the projected image based on the target color compensation value.
8. The apparatus of claim 7, wherein:
the determining unit is further used for acquiring color information of the target image and reading initial color information of the first image; wherein the initial color information is color information when the first image is projected to a white curtain; determining a color deviation value of the color information of the target image and the initial color information; determining an initial color compensation value for the projection based on the color deviation value.
9. A projector color correction apparatus, the apparatus comprising: a processor and a memory configured to store a computer program capable of running on the processor,
wherein the processor is configured to execute the steps of the projector color correction method of any of claims 1 to 6 when running the computer program.
10. 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 projector color correction method according to any one of claims 1 to 6.
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| CN113965739B (en) * | 2020-12-23 | 2023-07-25 | 深圳市火乐科技发展有限公司 | Projection equipment control method and device, medium and electronic equipment |
| CN115695742A (en) * | 2021-07-23 | 2023-02-03 | 青岛海尔科技有限公司 | Projection method and apparatus, storage medium, and electronic apparatus |
| CN115174880B (en) * | 2022-09-08 | 2023-03-10 | 江西渊薮信息科技有限公司 | Projection system, projector and projection method for improving color gamut |
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| CN1320810C (en) * | 2005-03-21 | 2007-06-06 | 四川华控图形科技有限公司 | Color correction method for reducing color different between channel of multi-channel projection display system |
| CN102355567A (en) * | 2011-10-27 | 2012-02-15 | 王悦 | Automatic color cast interference processing method |
| CN104463858A (en) * | 2014-11-28 | 2015-03-25 | 中国航空无线电电子研究所 | Projection color self-adaption correction method |
| CN106791749A (en) * | 2017-02-09 | 2017-05-31 | 微鲸科技有限公司 | Color correction method for projection picture and projector |
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