CN108737806A - A kind of projecting apparatus color correcting method and device, computer storage media - Google Patents

Abstract

The invention discloses a projector color correction method and device, and a computer storage medium. The method includes: collecting the target image formed by the first image in the projection area; determining the initial color compensation value for projection based on the first image and the target image; based on the initial color compensation value, adjusting the initial color The compensation value is calibrated to obtain the projected target color compensation value, and the image to be projected is compensated based on the target color compensation value.

Description

Method and device for color correction of projector, and computer storage medium

technical field

The invention relates to the field of projection technology, in particular to a method and device for color correction of a projector, and a computer storage medium.

Background technique

With the continuous development of smart terminals, micro-projectors based on Liquid Crystal on Silicon (LCOS) or Digital Light Processing (DLP) technology can be integrated into smart terminals to meet consumers' requirements for smart terminals. Portability, entertainment, practicality and other needs.

In practical applications, users generally use a white curtain or white wall as the projection background; however, the warm and cool tones set by the projector itself will make the image projected on the white curtain or white wall yellowish, or the white curtain or white wall The projected image will be affected when there is discoloration of the body and dark spots and stains; in addition, in real life, the color of the wall is not necessarily white, which makes the image projected on the non-white wall appear color deviation. Therefore, there is an urgent need for a projector color correction method to reduce the interference of the projection background on the projection image and ensure the authenticity of the projection content.

Contents of the invention

In order to solve the above technical problems, embodiments of the present invention provide a projector color correction method and device, and a computer storage medium.

An embodiment of the present invention provides a projector color correction method, including:

collecting the target image formed by the first image in the projection area;

determining an initial color compensation value for projection based on the first image and the target image;

Based on the initial color compensation value, the initial color compensation value is calibrated to obtain a projected target color compensation value, and the image to be projected is compensated based on the target color compensation value.

An embodiment of the present invention also provides a projector color correction device, the device comprising:

an acquisition unit, configured to acquire a target image formed by the first image in the projection area;

A determining unit, configured to determine an initial color compensation value for projection based on the first image and the target image;

The processing unit is configured to calibrate the initial color compensation value based on the initial color compensation value, obtain a projected target color compensation value, and compensate the projected image based on the target color compensation value.

An embodiment of the present invention further provides a projector color correction device, the device includes: a processor and a memory configured to store a computer program that can run on the processor,

Wherein, the processor is configured to execute the steps of the projector color calibration method described above when running the computer program.

An embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the above methods are implemented.

Embodiments of the present invention provide a projector color correction method and device, and a computer storage medium. First, collect a target image formed by a first image in a projection area; determine the projected target image based on the first image and the target image Initial color compensation value; based on the initial color compensation value, the initial color compensation value is calibrated to obtain the projected target color compensation value, and the projected image is compensated based on the target color compensation value; thus, the collected Compare the obtained target image with the first image, know the difference between the target image and the original image, obtain the initial color compensation value, and then calibrate the initial color compensation value; in this way, the color to be compensated can be determined according to the projection environment, so that the projected to The image in the projection area is closer to the color of the real image, which reduces the interference of the projection background on the projection image, ensures the authenticity of the projection content, and improves user experience.

Description of drawings

Fig. 1 is a schematic structural diagram of a mobile phone carrying a projector lens provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a color correction method for a projector provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of another method for color correction of a projector provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of the structural composition of a projector color correction device provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a hardware structure composition of a projector color correction device provided by an embodiment of the present invention.

Detailed ways

In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.

With the continuous development of mobile terminal technology, no matter how large the display screen is, it cannot meet people's requirements for image size. For people traveling, it is even more impossible to completely sacrifice portability to meet the needs of large screens. Therefore, only the simple and easy imaging method of projection can provide maximum portability and large-screen audio-visual entertainment. At present, pico projectors based on Liquid Crystal on Silicon (LCOS) or Digital Light Processing (DLP) technology can be integrated into smart terminals to meet consumers' requirements for portability, entertainment, Requirements such as practicability; for example, as shown in FIG. 1 , in the prior art, a projector lens 101 is set on the top of a mobile device 100 for projection.

Generally, when a user uses the projector that comes with a smart terminal to project, due to the lack of a projection environment, the user directly projects the image onto the wall; however, due to the difference in wall color and structure, the projected image will be blurred. Colors may vary from the actual image. For example, the warm and cool tones set by the projector itself will make the image projected on the white curtain or white wall yellowish, or the white curtain or white wall will be discolored and have dark spots and stains, which will affect the projected image; in addition, reality In daily life, the color of the wall is not necessarily white, which makes the image projected on the non-white wall appear color deviation.

In order to solve such problems of projected image distortion or projected image abnormality caused by inconsistencies in the projected background, an embodiment of the present invention proposes a projector color correction method, which can determine the color to be compensated according to the projected environment, so that the projected to The image in the projection area is closer to the color of the real image, which reduces the interference of the projection background on the projection image, ensures the authenticity of the projection content, and improves user experience.

Fig. 2 is a schematic flowchart of a method for color correction of a projector provided by an embodiment of the present invention. As shown in Fig. 2, the method for color correction of a projector includes the following steps:

Step 201, collecting a target image formed by the first image in the projection area.

Wherein, step 201 collects the target image formed by the first image in the projection area and can be realized by a mobile terminal; in practical applications, the mobile terminal can be a mobile electronic device with an image collection function; for example, the mobile terminal can be a mobile phone, a tablet Computers, laptops, handheld computers, smart wearable devices, etc. In other embodiments of the present invention, as shown in FIG. 3, the mobile terminal 30 uses a projector lens 31 to project the first image; wherein, the projector lens 31 can be directly integrated on the flashlight and is located near the camera 32; thus , when the projector lens 31 is projecting, the projected image can be collected by the camera 32 located near the projector lens 31 .

In other embodiments of the present invention, the first image refers to the standard comparison image used in the color correction of the projector; wherein, the first image can be any type of image that is pre-saved in the smart terminal, such as a landscape image, a character image Wait. Preferably, the first image can be set according to common wall colors.

In addition, the target image refers to the image formed in the projection area after the first image is projected by the mobile terminal. It can be understood that the first image and the target image have the same image content, but since the target image is projected into the projection area, the color of the target image and the first image will deviate due to the influence of the projection environment.

Step 202. Based on the first image and the target image, determine an initial color compensation value for projection.

Wherein, step 202 is based on the first image and the target image, and determining the initial color compensation value for projection can be implemented by the mobile terminal.

Here, the first image is a standard comparison image, and the target image is an image formed after projection; therefore, by comparing the first image with the target image, the mobile terminal can roughly estimate the color difference between the target image and the first image, thus It is possible to know the influence of the background color or dark clusters and other pollutants during projection on the projected image; and then determine the initial color compensation value according to the color difference value.

Specifically, since the image content of the first image and the target image are the same, each pixel in the first image and the target image has a corresponding relationship; thus, the mobile terminal compares the color information of corresponding pixels in the two images, It is possible to determine the color difference of specific pixels in two images; that is, by comparing the color information of each pixel in the first image and the target image, it is possible to precisely locate the position where the color information changes, so that the mobile terminal can identify the specific The color of the position is compensated.

Step 203: Calibrate the initial color compensation value based on the initial color compensation value to obtain a target color compensation value for projection, and compensate the image to be projected based on the target color compensation value.

Wherein, step 203 calibrates the initial color compensation value based on the initial color compensation value, obtains the projected target color compensation value, and compensates the projected image based on the target color compensation value, which can be implemented by the mobile terminal.

In practical applications, when the projection background is relatively complex, such as a TV background wall, the color compensation value obtained by directly comparing the target image with the first image is not accurate, and the initial color value obtained needs to be adjusted to obtain Accurate color compensation values.

Specifically, the mobile terminal determines the initial compensation light according to the initial color compensation value, and selects a calibration image; overlaps the initial compensation light and the calibration image, and projects the overlapped image into the projection area to form a fifth image. Then the terminal device may 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 aforementioned 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 above-mentioned calibration image is generated through a projection lens, and the projection lens and the compensation lens are set independently.

In order to obtain the target color compensation value accurately subsequently, so as to better realize the color correction of the image to be projected, the above-mentioned 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 with red, green and blue pure color pictures.

An embodiment of the present invention provides a method for color correction of a projector. First, collect a target image formed by a first image in a projection area; determine an initial color compensation value for projection based on the first image and the target image; The initial color compensation value is calibrated to the initial color compensation value to obtain a projected target color compensation value, and the projected image is compensated based on the target color compensation value; in this way, the collected target image can be combined with the first Compare the target image with the original image, get the initial color compensation value, and then calibrate the initial color compensation value; in this way, the color to be compensated can be determined according to the projection environment, so that the image projected into the projection area is more accurate. The color close to the real image reduces the interference of the projected background to the projected image, ensures the authenticity of the projected content and improves the user experience.

Based on the foregoing embodiments, an embodiment of the present invention provides a method for color correction of a projector, as shown in FIG. 4 , the method includes the following steps:

Step 401, the mobile terminal collects the target image formed by the first image in the projection area.

Step 402, the mobile terminal acquires the color information of the target image, and reads the initial color information of the first image.

In other embodiments of the present invention, the above color information refers to the color value of each pixel in the target image; preferably, the color value can be represented by a red-green-blue (Red-Green-Blue, RGB) value . In practical applications, RGB values include three color values of red, green, and blue, each with 256 levels of brightness, and integers from 0 to 255 can be used to represent different levels; thus, the values of the three basic colors of R, G, and B Different combinations can produce various colors. Exemplarily, the color information of a certain pixel in the target image may be expressed as (R255, G215, B200). Similarly, the initial color information refers to the color value of each pixel of the first image.

In other embodiments of the present invention, the mobile terminal may store initial color information of the first image; preferably, the initial color information may be color information when the first image is projected onto a white screen.

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 content of the target image and the first image are the same, there is a corresponding relationship between the pixels in the target image and the first image; based on this, the mobile terminal can place the target image in a certain order The RGB value of the pixel point in the image is compared with the RGB value of the pixel point at the corresponding position in the first image to obtain the color difference value of each pixel point. Exemplarily, if the color information of the Nth pixel of the target image is (R255, G215, B200), and the color information of the corresponding Nth pixel in the first image is (R240, G200, B215); then, The color difference value of the Nth pixel can be expressed as (+R15, +G15, -B15).

Further, after traversing and comparing all pixels in the target image with the pixels of the first image, the color difference of each pixel of the target image can be obtained; write the color difference of all pixels into an array, The array is the color deviation value of the first image.

Step 404, the mobile terminal determines an initial color compensation value for projection based on the color deviation value.

Specifically, the mobile terminal may determine the initial color compensation value of each pixel according to the color difference value of each pixel in the color deviation value. Here, when the initial color compensation value is added to the target image, the RGB value of each pixel in the target image can be made the same as the RGB value of each pixel in the first image.

Step 405, the mobile terminal projects red, green and blue solid color images based on the initial color compensation value.

In other embodiments of the present invention, the mobile terminal determines the initial compensation light according to the initial color compensation value, respectively overlaps the initial compensation light with red, green and blue solid color images, and projects the overlapped images to the projection within the area.

In step 406, the mobile terminal collects red, green and blue solid-color images and projects them into the second image, the third image and the fourth image formed in the projection area.

Specifically, the mobile terminal overlaps the initial compensation light with the red solid color image, projects the overlapped image to the projection area to form a second image, and controls the camera to collect the second image. Next, overlap the initial compensation light with the green solid-color image, and project the overlapped image to the projection area to form a third image, and control the camera to capture the third image; similarly, overlap the initial compensation light with the blue solid-color image , and project the overlapped image to the projection area to form a fourth image, and control the camera to collect the fourth image.

It should be noted that it is an independent process for the mobile terminal to overlap the initial compensation light with a solid color image of a certain color, and collect the overlapped and projected image into the projection area; and, the mobile terminal combines the initial compensation light with red, The green and blue solid color images are overlapped and the order of the overlapped images is collected in no particular order.

Step 407 , the mobile terminal compares the second image, the third image and the fourth image with the corresponding red, green and blue solid color images respectively to obtain red difference value, green difference value and blue difference value.

Specifically, after the mobile terminal acquires the second image, the third image, and the fourth image, it obtains the RGB values of the pixels in the second image, the third image, and the fourth image respectively; the RGB values of the pixels in the second image Value is compared with the RGB value of the corresponding pixel in the red solid color image stored in the mobile terminal to obtain the red difference value; similarly, the RGB value of the pixel in the third image is compared with the green solid color image stored in the mobile terminal Comparing the RGB values of the corresponding pixels to obtain the green difference value; comparing the RGB value of the pixel in the fourth image with the RGB value of the corresponding pixel in the blue solid color image stored in the mobile terminal to obtain the blue difference value .

Step 408, the mobile terminal adjusts 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.

Specifically, the mobile terminal adjusts the R value in the initial color compensation value according to the red difference value, adjusts the G value in the initial color compensation value according to the green difference value, and adjusts the G value in the initial color compensation value according to the blue difference value. Adjust the B value; finally, the adjusted initial color compensation value is the target color compensation value.

Step 409, the mobile terminal determines the projected target compensation light based on the target color compensation value.

Step 410: Overlay the image to be projected and the target compensation light, and project the overlapped image into the projection area.

Specifically, 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 a projection lens, and the projection lens and the compensation lens are independent of each other, that is to say, the projection lens and the compensation lens are set independently.

It should be noted that for explanations of the same steps or related concepts in this embodiment and other embodiments, reference may be made to the descriptions in other embodiments, and details are not repeated here.

An embodiment of the present invention provides a method for color correction of a projector. First, collect a target image formed by a first image in a projection area; determine an initial color compensation value for projection based on the first image and the target image; The initial color compensation value is calibrated to the initial color compensation value to obtain a projected target color compensation value, and the projected image is compensated based on the target color compensation value; in this way, the collected target image can be combined with the first Compare the target image with the original image, get the initial color compensation value, and then calibrate the initial color compensation value; in this way, the color to be compensated can be determined according to the projection environment, so that the image projected into the projection area is more accurate. The color close to the real image reduces the interference of the projected background to the projected image, ensures the authenticity of the projected content and improves the user experience.

In order to implement the method of the embodiment of the present invention, the embodiment of the present invention provides a projector color correction device, the device is set in the mobile terminal in the above embodiment; as shown in Figure 5, the device includes:

an acquisition unit 51, configured to acquire a target image formed by the first image in the projection area;

A determining unit 52, configured to determine an initial color compensation value for projection based on the first image and the target image;

The processing unit 53 is configured to calibrate the initial color compensation value based on the initial color compensation value, 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 acquiring unit 51 is further configured to acquire color information of pixels in the target image; read initial color information of pixels in the first image; wherein, the initial color information is the color information of the pixels when the first image is projected onto the white screen;

The determining unit 52 is further configured to determine a color deviation value between the color information of the target image and the initial color information; and determine an initial color compensation value of the projection based on the color deviation value.

In other embodiments of the present invention, the processing unit 53 is further configured to project red, green and blue solid color images based on the initial color compensation value;

The collection unit 51 is also used to respectively collect red, green and blue solid-color images and project them into the second image, the third image and the fourth image formed in the projection area;

The processing unit 53 is further configured to compare the second image, the third image, and the fourth image with the corresponding red, green, and blue solid-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 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; overlap the image to be projected with the target compensation light, and The image of is projected into the projection area.

In other embodiments of the present invention, the image to be projected is projected through a projection lens; and the target compensation light is projected through a compensation lens. Moreover, the projection lens and the compensation lens are independent of each other.

An embodiment of the present invention provides a projector color correction device. First, collect a target image formed by a first image in a projection area; determine an initial color compensation value for projection based on the first image and the target image; The initial color compensation value is calibrated to the initial color compensation value to obtain a projected target color compensation value, and the projected image is compensated based on the target color compensation value; in this way, the collected target image can be combined with the first Compare the target image with the original image, get the initial color compensation value, and then calibrate the initial color compensation value; in this way, the color to be compensated can be determined according to the projection environment, so that the image projected into the projection area is more accurate. The color close to the real image reduces the interference of the projected background to the projected image, ensures the authenticity of the projected content and improves the user experience.

Based on the hardware implementation of each unit in the above-mentioned projector color correction device, in order to realize the projector color correction method provided by the embodiment of the present invention, the embodiment of the present invention also provides a projector color correction device, as shown in FIG. 6 , the The device 60 includes: a processor 61 and a memory 62 configured to store a computer program capable of running on the processor,

Wherein, the processor 61 is configured to execute the method steps in the foregoing embodiments when running the computer program.

Of course, in actual application, as shown in FIG. 6 , various components in the device 60 are coupled together through a bus system 63 . It can be understood that the bus system 73 is used to realize connection and communication between these components. In addition to the data bus, the bus system 63 also includes a power bus, a control bus and a status signal bus. However, the various buses are labeled as bus system 63 in FIG. 6 for clarity of illustration.

In an exemplary embodiment, the embodiment of the present invention also provides a computer-readable storage medium, such as a memory 62 including a computer program, and the above-mentioned computer program can be executed by the processor 61 of the projector color correction device 60 to complete the aforementioned method the steps. The computer-readable storage medium can be a magnetic random access memory (FRAM, ferromagnetic random access memory), a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), erasable Programmable Read-Only Memory (EPROM, Erasable Programmable Read-Only Memory), Electrically Erasable Programmable Read-Only Memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), Flash Memory (FlashMemory), Magnetic Surface Memory, CD-ROM, Or memory such as CD-ROM (Compact Disc Read-Only Memory).

The technical solutions described in the embodiments of the present invention may be combined arbitrarily if there is no conflict.

In the several embodiments provided by the present invention, it should be understood that the disclosed methods and smart devices can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical or other forms of.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units; Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be fully integrated into a second processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention.

Claims (10)

1. A projector color correction method, said method comprising: collecting the target image formed by the first image in the projection area; determining an initial color compensation value for projection based on the first image and the target image; Based on the initial color compensation value, the initial color compensation value is calibrated to obtain a projected target color compensation value, and the image to be projected is compensated based on the target color compensation value. 2. The method according to claim 1, wherein said determining an initial color compensation value for projection based on said first image and said target image comprises: Acquiring the color information of the target image, and reading the initial color information of the first image; wherein, the initial color information is the color information when the first image is projected onto a white screen; determining a color deviation value between the color information of the target image and the initial color information; Based on the color bias value, an initial color compensation value for the projection is determined. 3. The method according to claim 1, wherein the calibration of the initial color compensation value to obtain the projected target color compensation value comprises: projecting red, green and blue solid color images based on said initial color compensation values; Respectively collecting red, green and blue solid color images and projecting them to the second image, the third image and the fourth image formed in the projection area; Comparing the second image, the third image, and the fourth image with the corresponding red, green, and blue solid-color images, respectively, to obtain a red difference value, a green difference value, and a blue difference value; The initial color compensation value is adjusted 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 according to claim 1, wherein the 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; The image to be projected and the target compensation light are overlapped, and the overlapped image is projected into the projection area. 5. The method according to claim 4, wherein the overlapping of the image to be projected and the target compensation light, and projecting the overlapped image into the projection area comprises: projecting the image to be projected through a projection lens; The target compensation light is projected through a compensation lens. 6. The method according to claim 5, wherein: the projection lens and the compensation lens are independent of each other. 7. A projector color correction device, said device comprising: an acquisition unit, configured to acquire a target image formed by the first image in the projection area; A determining unit, configured to determine an initial color compensation value for projection based on the first image and the target image; The processing unit is configured to calibrate the initial color compensation value based on the initial color compensation value, obtain a projected target color compensation value, and compensate the projected image based on the target color compensation value. 8. The device according to claim 7, characterized in that: The acquiring unit is further configured to acquire the color information of the target image, and read the initial color information of the first image; wherein, the initial color information is the color information when the first image is projected onto a white screen; The determination unit is further configured to determine a color deviation value between the color information of the target image and the initial color information; and determine an initial color compensation value of the projection based on the color deviation value. 9. A projector color correction apparatus, said apparatus comprising: a processor and a memory configured to store a computer program operable on the processor, Wherein, the processor is configured to execute the steps of the projector color correction method according to any one of claims 1 to 6 when running the computer program. 10. A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the projector color correction method according to any one of claims 1 to 6 are realized.