WO2016110008A1 - Method and device for projection control, projection device, and storage medium - Google Patents

Abstract

A method and device for projection control, a projection device, and a computer storage medium. Before formal projection, an all standard color content is projected onto a projection surface and a content currently displayed on the projection surface is collected to produce a projection surface test image (S101); the colors of pixels of the projection surface test image are compared with standard colors to determine non-standard color pixels requiring color correction (S102); the colors of the non-standard color pixels are corrected to produce corrected colors for the non-standard color pixels (S103); and, during formal projection, the corresponding corrected colors are employed for projection of the non-standard color pixels on the projection surface (S104).

Description

Projection control method, device, projection device, storage medium Technical field

The present invention relates to the field of multimedia, and in particular, to a projection control method, device, projection device, and computer storage medium.

Background technique

A projector, also known as a projector, is a device that can project images or video onto a screen. It can be used to digitize video discs (DVD, Digital Video) with different interfaces and computers, video compact discs (VCD, Video Compact Disc). Disc), Blu-ray Disc (BD, Blu-ray Disc), game console, digital video (DV, Digital Video), etc. are connected to play the corresponding video signal. Projectors are widely used in homes, offices, schools and entertainment venues. Depending on the way of operation, there are CRT (Crystal Ray Tube), Liquid Crystal Display (LCD), Digital Light Processor (DLP, Digital Light). Processor) and other different types. According to statistics, in 2010 China's projector market shipments reached 1.28 million units, an increase of 43.6% compared to 2009. According to the analysis, China's projector market will continue to grow rapidly in 2011, with annual shipments reaching 1.67 million units and an annual growth rate of approximately 30% for projectors. In the next five years, the compound growth rate of the Chinese projector market will reach 17.1%. In the past two years, with the rapid decline in the cost and price of projectors, the market has seen a state of blowout, and projectors have quickly entered thousands of households. Home theater and portable business projectors have gradually become the main models in the market.

The projection principle of the existing projector is based on the color of each pixel of the projected content (three primary colors RGB values), combined into a corresponding color, through which the light is projected by the lens onto the surface of the front object (curtain, wall, etc.). image. However, since the projection environment of the home or simple business may not be very standard, the projection surface is not standard, such as the color of the ambient light, or the wall with the color or stain is directly used as the projection surface without the projection screen, and projected onto the surface. The color of the image will produce a color deviation, which will reduce the image color reproduction degree to a certain extent, affecting the investment. The viewing effect of the shadow image.

Summary of the invention

In order to solve the existing technical problems, the embodiments of the present invention provide a projection control method and device, a projection device, and a computer storage medium, which solve the problem that the projection effect is poor due to the non-standard projection surface in the existing projection process.

To solve the above technical problem, an embodiment of the present invention provides a projection control method, including:

Projecting the full standard color content onto the projection surface, and then collecting the current display content of the projection surface to obtain a projection surface test image;

Comparing the color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected;

Performing color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point;

When projecting on the projection surface, the non-standard color pixel points are projected with a corresponding corrected color.

In an embodiment of the invention, the determining the non-standard color pixel points that need to be color corrected comprises:

Obtaining a color of each pixel of the projection surface test picture;

Determining whether the color of each pixel is the same as the standard color, and if it is determined to be different, determining that the pixel is a non-standard color pixel; otherwise, determining that the pixel is a standard color pixel.

In an embodiment of the invention, color correction of the non-standard color pixel points includes:

Using the color of the non-standard color pixel point in the projection surface test picture as the background color of the pixel point;

Obtaining, as the pixel point, a color corresponding to the content to be projected by the non-standard color pixel point Foreground color

And determining, according to the background color and the foreground color of the non-standard color pixel point, a corresponding optimal display color as a corrected color of the pixel point in the preset color card conversion table; the color card conversion table includes each background color and The best display color for the foreground color.

In an embodiment of the present invention, the pre-set color card conversion table includes:

Selecting the color C _i as the background color from the standard color card range table, wherein the i is greater than or equal to 1, less than or equal to n, and the n is the total number of colors included in the standard color card range table;

Using the background color and the standard color as test background colors of the first test projection surface and the second test projection surface, respectively;

Selecting a color C _j as a foreground color from the standard color card range table, and projecting a test image onto the first test projection surface and the second test projection surface respectively with the foreground color content; the j is greater than or equal to 1 , less than or equal to n;

Adjusting a color of the test image on the first test projection surface such that the display effect is consistent with the test image display effect on the second test projection surface, and correspondingly adjusting the final color as the background color and the foreground color The best display color Z _{ij is} recorded in the color card conversion table;

or,

Select color C _i as the background color from the standard color card range table;

Using the background color as a test background color of the test projection surface;

Selecting a color C _j from the standard color card range table as a foreground color, and projecting a test image onto the test projection surface with the foreground color content; the j being greater than or equal to 1, less than or equal to n;

Adjusting the color of the test image on the test projection surface to optimize the display effect, and recording the final adjusted color as the background color and the optimal display color Z _ij corresponding to the foreground color in the color card conversion table .

In one embodiment of the invention, the standard color is white.

In order to solve the above problems, an embodiment of the present invention further provides a projection control apparatus, including Testing a picture acquisition module, a determination module, a color correction module, and a projection module;

The test picture acquisition module is configured to project full standard color content onto the projection surface, and then collect the current display content of the projection surface to obtain a projection surface test picture;

The determining module is configured to compare a color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected;

The color correction module is configured to perform color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point;

The projection module is configured to project the non-standard color pixel points with a corresponding corrected color when projecting on the projection surface.

In an embodiment of the present invention, the determining module includes a color obtaining submodule and a comparing submodule;

The color acquisition sub-module is configured to acquire a color of each pixel of the test surface of the projection surface;

The comparison sub-module is configured to determine whether the color of each pixel is the same as the standard color, and if it is determined to be different, determining that the pixel is a non-standard color pixel; otherwise, determining the pixel as a standard Color pixel points.

In an embodiment of the present invention, the color correction module includes a background color determination sub-module, a foreground color determination sub-module, and a lookup sub-module;

The background color determining submodule is configured to use a color of the non-standard color pixel point in the projection surface test picture as a background color of the pixel point;

The foreground color determining sub-module is configured to obtain a color corresponding to the content to be projected by the non-standard color pixel point as a foreground color of the pixel point;

The locating sub-module is configured to find a corresponding optimal display color as a corrected color of the pixel according to the background color and the foreground color of the non-standard color pixel to the preset color card conversion table; The card conversion table contains the best display for each background color and foreground color. Show color.

In an embodiment of the present invention, the method further includes a color card conversion table setting module, where the color card conversion table setting module includes a first background color selection sub-module, a first test background color determination sub-module, and a first foreground color selection. a submodule and a first adjustment submodule;

The first background color selection sub-module is configured to select a color C _i as a background color from a standard color card range table, wherein the i is greater than or equal to 1, less than or equal to n, and the n is the standard color card range table. The total number of colors included;

The first test background color determining submodule is configured to use the background color and the standard color as test background colors of the first test projection surface and the second test projection surface, respectively;

The first foreground color selection sub-module is configured to select a color C _j as a foreground color from the standard color card range table, and project a test image to the first test projection surface and the first The second test projection surface; the j is greater than or equal to 1, less than or equal to n;

The first adjustment sub-module is configured to adjust a color of the test image on the first test projection surface to make the display effect the best or the display effect is consistent with the test image display effect on the second test projection surface, which will eventually Adjusting the color as the background color and the optimal display color Z _ij corresponding to the foreground color are recorded in the color card conversion table;

Alternatively, the color card conversion table setting module includes a second background color selection sub-module, a second foreground color selection sub-module, a second test background color determination sub-module, and a second adjustment sub-module;

The second background color selection submodule is configured to select a color C _i as a background color from a standard color card range table;

The second test background color determining submodule is configured to use the background color as a test background color of the test projection surface;

The second foreground color selection sub-module is configured to select a color C _j as a foreground color from the standard color card range table, and project a test image onto the test projection surface with the foreground color content; the j is greater than Equal to 1, less than or equal to n;

The second adjustment submodule is configured to adjust a color of the test image on the test projection surface to optimize the display effect, and use the final adjusted color as the optimal display corresponding to the background color and the foreground color. The color Z _{ij is} recorded in the color card conversion table.

In order to solve the above problems, the present invention also provides a projection apparatus including a projector, an image collector and a processor; the projector configured to project full standard color content onto a projection surface; the image collector, configured After the full standard color content is projected onto the projection surface by the projector, the current display content of the projection surface is acquired to obtain a projection surface test image; and the processor is configured to test the color of each pixel of the image on the projection surface Determining a standard color to determine a non-standard color pixel point that requires color correction, performing color correction on the non-standard color pixel point to obtain a corrected color of each non-standard color pixel point, and at the projector at the projection When projecting on the surface, the projector is controlled to project the non-standard color pixel points with corresponding corrected colors.

In an embodiment of the invention, the image collector is a camera module.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the foregoing projection control method.

The beneficial effects of the embodiments of the present invention are:

The projection control method and device, the projection device and the computer storage medium provided by the embodiments of the present invention project the full standard color content onto the projection surface before the formal projection, and then collect the current display content of the projection surface to obtain the projection surface test image; The color of each pixel of the test picture is compared with the standard color to determine a non-standard color pixel point that needs to be color corrected; the color correction of the non-standard color pixel point is corrected to obtain the corrected color of each non-standard color pixel point; Non-standard color pixels on the projection surface are projected with corresponding corrected colors. Since the embodiment of the present invention performs color correction on non-standard color pixel points on the projection surface, and performs projection on the pixel points with the corrected color during projection, the non-standard color pixel points can be reduced. The influence on the projected image, so that the color reproduction degree of the projected image can be improved, the projection quality can be improved, and the satisfaction of the user experience can be improved without the projection screen, or the projection screen, the stain on the projection wall or the color of the ambient light. .

DRAWINGS

1 is a schematic flow chart of a projection control method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of determining non-standard color pixel points according to Embodiment 1 of the present invention;

3 is a schematic flowchart of performing a color correction process according to Embodiment 1 of the present invention;

4 is a schematic flowchart of setting a color card conversion table according to Embodiment 1 of the present invention;

FIG. 5 is a schematic flowchart of another setting color card conversion table according to Embodiment 1 of the present invention; FIG.

6 is a schematic diagram of a test projection surface according to Embodiment 1 of the present invention;

FIG. 7 is a schematic structural diagram of a projection control apparatus according to Embodiment 2 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of another projection control apparatus according to Embodiment 2 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a projection apparatus according to Embodiment 3 of the present invention; FIG.

10 is a schematic diagram of a color value determining process of each pixel of a projection wall according to Embodiment 3 of the present invention;

FIG. 11 is a schematic diagram of a formal projection process according to Embodiment 3 of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

Referring to FIG. 1 , the projection control method in this embodiment includes:

Step 101: Before the official projection, project the full standard color content onto the projection surface, and then collect the current display content of the projection surface to obtain a projection surface test image;

Step 102: Comparing the color of each pixel of the projection surface test picture with the standard color Non-standard color pixels to be color corrected;

Step 103: performing color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point;

Step 104: When the projection surface is formally projected, the non-standard color pixel points on the projection surface are projected by using corresponding correction colors.

It can be seen that the embodiment can identify the non-standard color pixel points of the projection surface before the formal projection, and can perform color correction on the recognized non-standard color pixel points, and then use the corrected color for the pixel points during the formal projection. Projection can reduce the influence of non-standard color pixels on the projected image, so the color reproduction degree of the projected image can be improved without a projection cloth, or a projection cloth, a stain on the projection wall, or a non-standard projection environment such as ambient light. Improve the quality of the projections and increase the satisfaction of the user experience.

The standard color in the above step 101 is mainly selected to be the same color as a standard projection surface (for example, a standard projection screen). Since the color of the existing standard projection surface is generally set to white, the standard color in this embodiment is set to white. However, it should be understood that the standard color in this embodiment is not limited to white, and may vary with the color of the standard projection surface, and may even vary according to the needs of the user.

In the above step 102, it is determined that the non-standard color pixel points on the projection surface that need to be color corrected are shown in FIG. 2, including:

Step 1021: Obtain the color of each pixel of the test surface of the projection surface, and specifically obtain the RGB value of the color of each pixel;

Step 1022: Determine whether the color of each pixel is the same as the standard color (specifically, whether the color RGB value of each pixel is equal to the RGB value of the standard color or within the RGB value range of the standard color), if not, go to the step 1023; otherwise, go to step 1024:

Step 1023: Determine that the pixel is a non-standard color pixel.

Step 1024: Determine that the pixel is a standard color pixel.

In the above step 1022, the projection surface may be a professional projection cloth, or may be various wall surfaces or the like. The color of the pixel on the projection surface may be different from the standard color due to the color of the projection surface itself, or the presence of stains, or the color of the ambient light. In the above step 1024, it is determined that the color of the standard color pixel is consistent with the standard color, so no additional color correction is required.

In the above step 103, performing color correction on the confirmed non-standard color pixel points to obtain the corrected color of each non-standard color pixel point, as shown in FIG. 3, includes:

Step 1031: The color of the non-standard color pixel in the test image of the projection surface is taken as the background color of the pixel;

Step 1032: Acquire a color corresponding to the content of the non-standard color pixel to be projected as the foreground color of the pixel;

Step 1033: Find a corresponding optimal display color according to a background color and a foreground color of the non-standard color pixel to a preset color of the pixel point; the preset color card conversion table includes The best display color for each background color and foreground color.

In this embodiment, the process of setting the color card conversion table in advance is shown in FIG. 4, and includes:

Step 401: Select a color C _i as the background color from the standard color card range table, where i is greater than or equal to 1, less than or equal to n, i=i+1; n is the total number of colors included in the standard color card range table;

Step 402: The selected background color and the standard color are respectively used as the test background color of the first test projection surface and the second test projection surface, that is, the first test projection surface and the second test projection surface are respectively set as the background color and the standard. Color, the first test projection surface and the second test projection surface in this embodiment are the same except that the test background color is different;

Step 403: Select a color C _j as a foreground color from the standard color card range table, and project the test image to the first test projection surface and the second test projection surface respectively according to the foreground color content; j is greater than or equal to 1, less than or equal to n , j=j+1; n is the total number of colors included in the standard color card range table;

Step 404: Adjust the color of the test image on the first test projection surface so that the display effect is consistent with the test image display effect on the second test projection surface, and use the final adjusted color as the best display corresponding to the current background color and the foreground color. The color Z _{ij is} recorded in the color card conversion table.

The color card conversion table setting process shown in FIG. 4 is adjusted by the comparison of the graphics on the standard test projection surface (ie, the second test projection surface) to the standard on the standard test projection surface. However, it should be understood that the present embodiment can also be set without using a standard test projection surface. For example, as shown in FIG. 5, it includes:

Step 501: Select a color C _i as the background color from the standard color card range table, where i is greater than or equal to 1, less than or equal to n, i=i+1; n is the total number of colors included in the standard color card range table;

Step 502: The selected background color is used as the test background color of the test projection surface, and the test projection surface is also set as the background color;

Step 503: Select a color C _j as a foreground color from the standard color card range table, and project a test image onto the test projection surface with the foreground color content; j is greater than or equal to 1, less than or equal to n, j=j+1; n is The total number of colors included in the standard color card range table;

Step 504: Adjust the color of the test image on the test projection surface to optimize the display effect, and record the final adjusted color as the background color and the optimal display color Z _ij corresponding to the foreground color to the color card conversion table. in. The judgment condition of the best display effect of the step may be selected according to different application scenarios. For example, for an application scenario requiring the best definition, the judgment condition may be set to display the resolution.

The test image projected onto the test projection surface in this embodiment may be any image such as a line image, a circular image, or the like. It should be understood that the test image projected onto the first test projection surface in this embodiment is preferably the same as the test image projected onto the second test projection surface to facilitate comparison analysis.

In order to better understand the present invention, the following further exemplifies the setting process shown in FIG. 4, in combination with a specific standard color card range table, and the standard color is white as an example:

1. Select a set of color cards with appropriate precision as the standard color card range table to determine each color in the color card. For the range of values corresponding to RGB, the standard color card range table is shown in Table 1:

Table I

Color name R range G range B range C1 R1—R2 G1—G2 B1—B2 C2 R3—R4 G3—G4 B3—B4 ...... ...... ...... ...... Cn R2n-1—R2n G2n-1—G2n B2n-1—B2n

Each color C(R, G, B) can determine the color card color S corresponding to the color according to the corresponding RGB range in Table 1, and the color S satisfies the following conditions:

S=(Rs1<=R&&Rs2>R)&&(Gs1<=G&&Gs2>G)&&(Bs1<=B&&Bs2>B)

In the above formula, Rs1 and Rs2 correspond to the R range, Gs1 and Gs2 correspond to the G range, and Bs1 and Bs2 correspond to the B range.

2, set the color card conversion table

Select a color C _i (R _i , G _i , B _i )=(r _i , g _i , b _i ) from Table 1 as the background color, where i is greater than or equal to 1, less than or equal to n, i=i +1;

The selected color Ci and the standard color, that is, white, are respectively used as the test background color of the first test projection surface and the second test projection surface; then the color C _j is selected from Table 1 (R2j-1 - R2j, G2j-1 - G2j, B2j-1—B2j) As the foreground color for testing, in order to make the color representative, the RGB values of the color C _j are set in the projector as follows:

(Rj, Gj, Bj) = ((R2j-1+R2j)/2, (G2j-1+G2j)/2, (B2j-1+B2j)/2);

Projecting the test image with the foreground color Cj content (see FIG. 6 , the image is two straight lines, the upper area is the first test projection surface, and the lower area is the second test projection surface) to the first test projection surface. And the second test projection surface, adjusting the color of the straight line on the first test projection surface so that the display effect is consistent with the straight line on the second test projection surface (that is, substantially the same), and recording the corresponding color as the current background color The optimal display color Z _ij corresponding to the foreground color is recorded in the color card conversion table.

Cycling the above process, using each color and standard color white in Table 1 as the color of the first test projection surface and the second test projection surface, respectively, can find the best display color corresponding to each color for the foreground color and record to the color card. In the conversion table, the obtained color card conversion table is shown in Table 2:

Table II

Background\foreground C1 C2 C3 C4 ...... Cn C1 Z11 Z12 Z13 Z14 ...... Z1n C2 Z21 Z22 Z23 Z24 ...... Z2n ...... ...... ...... ...... ...... ...... ...... Cn Zn1 Zn2 Zn3 Zn4 ...... Znn

3. Perform a formal projection

Before the official content is projected, all the standard color or white content is projected onto the projection surface, and then the projection surface is photographed to obtain the projection surface test image; according to the projection surface test image, each pixel of the image can be obtained (x, y Corresponding RGB value, according to the RGB value of each pixel, the color Cn corresponding to the color card can be found in the standard color card range table; if Cn is white, the pixel color is not corrected, if it is not white, the pixel is determined The point is a non-standard color pixel, and the background color Cn of the pixel is recorded to obtain a list of pixel points to be corrected on the projection surface, as shown in Table 3:

Table 3

coordinate 1 2 ...... N 1 2 C1 C1 ...... C2 C3

*Note: Blank indicates that the pixel does not need to be corrected;

When the official content is projected, the position (x, y) in Table 3 is calculated according to the position (X, Y) of each pixel X (rgb) of the image, and the table is found to obtain C(x, y); if C ( x, y) = Cx is empty, the color is displayed directly; if not empty:

Obtaining, according to the X(rgb) color card range table, a color card color Ck corresponding to the projected content of the pixel point, as a foreground color of the pixel point;

According to the background color Cx and the foreground color Ck, look up Table 2 to obtain the optimal color Z of the pixel point adjusted according to the background color, that is, the corrected color Z;

Projection is performed at the pixel (x, y) position with the corrected color Z.

Embodiment 2:

The present embodiment provides a projection control device, as shown in FIG. 7, including a test picture acquisition module 71, a determination module 72, a color correction module 73, and a projection module 74;

The test picture obtaining module 71 is configured to project the full standard color content onto the projection surface, and then collect the current display content of the projection surface to obtain a projection surface test picture;

The determining module 72 is configured to compare the color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected;

The color correction module 73 is configured to perform color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point;

The projection module 74 is configured to project a non-standard color pixel on the projection surface with a corresponding corrected color when projected on the projection surface.

The standard color in this embodiment is mainly selected to be the same color as a standard projection surface (for example, a standard projection screen). Since the color of the existing standard projection surface is generally set to white, the standard color in this embodiment is set to white. However, it should be understood that the standard color in this embodiment is not limited to white, and may vary with the color of the standard projection surface, and may even vary according to the needs of the user.

The determining module 72 in this embodiment includes a color obtaining submodule and a comparing submodule;

a color acquisition sub-module configured to obtain a color of each pixel of the test surface of the projection surface;

The comparison submodule is configured to determine whether the color of each pixel is the same as the standard color. If it is determined to be different, the pixel is determined to be a non-standard color pixel; otherwise, the pixel is determined to be a standard color pixel.

The projection surface in this embodiment may be a professional projection cloth, or may be various wall surfaces or the like. The color of the pixel on the projection surface may be different from the standard color due to the color of the projection surface itself, or the presence of stains, or the color of the ambient light. It is determined that the color of the standard color pixel is consistent with the standard color, so no additional color correction is required.

The color correction module 73 includes a background color determination sub-module, a foreground color determination sub-module, and a lookup sub-module;

a background color determining submodule configured to use a color of the non-standard color pixel in the test image of the projection surface as a background color of the pixel;

a foreground color determining sub-module configured to obtain a color corresponding to the content to be projected by the non-standard color pixel point as a foreground color of the pixel point;

a search submodule configured to find a corresponding optimal display color according to a background color and a foreground color of the non-standard color pixel to a preset color conversion table; the color card conversion table includes each The best display color for the background color and foreground color.

Referring to FIG. 8, the projection control apparatus further includes a color card conversion table setting module 75. The color card conversion table setting module 75 includes a first background color selection sub-module, a first test background color determination sub-module, and a first foreground color selection. a submodule and a first adjustment submodule;

The first background color selection sub-module is configured to select the color C _i as the background color from the standard color card range table, where i is greater than or equal to 1, less than or equal to n, i=i+1; n is a standard color card range table The total number of colors included;

The first test background color determination sub-module is configured to select the selected background color and standard color The test background color of the first test projection surface and the second test projection surface, that is, the first test projection surface and the second test projection surface are respectively set as the background color and the background color, and the first test projection in this embodiment The surface and the second test projection surface are the same except that the test background color is different;

a first foreground color selection sub-module configured to select a color C _j as a foreground color from the standard color card range table, and project the test image to the first test projection surface and the second test projection surface respectively; Greater than or equal to 1, less than or equal to n, j=j+1; n is the total number of colors included in the standard color card range table;

The first adjustment submodule is configured to adjust the color of the test image on the first test projection surface so that the display effect is consistent with the test image display effect on the second test projection surface, and the final adjusted color is used as the current background color and the foreground color. The corresponding optimal display color Z _{ij is} recorded in the color card conversion table.

Or the color card conversion table setting module 75 includes a second background color selection sub-module, a second foreground color selection sub-module, a second test background color determination sub-module, and a second adjustment sub-module;

The second background color selection sub-module is configured to select the color C _i as the background color from the standard color card range table, where i is greater than or equal to 1, less than or equal to n, i=i+1; n is a standard color card range table The total number of colors included;

a second test background color determining sub-module configured to use the selected background color as a test background color of the test projection surface, and also to set the test projection surface to the background color;

a second foreground color selection sub-module configured to select a color C _j as a foreground color from a standard color card range table, and project a test image onto the test projection surface with a foreground color content; j is greater than or equal to 1, less than or equal to n, j =j+1;n is the total number of colors included in the standard color card range table;

The second adjustment module configured to adjust the test color test image projection surface to display the best results, the best color after the display color as the final adjustment of the background color and the foreground color corresponding to the recording Z _ij Go to the color card conversion table. The judgment condition of the best display effect of the step can be selected according to different application scenarios. For example, for an application scenario requiring the best definition, the judgment condition can be set to display the best definition.

The test image projected onto the test projection surface in this embodiment may be any image such as a line image, a circular image, or the like. It should be understood that the test image projected onto the first test projection surface in this embodiment is preferably the same as the test image projected onto the second test projection surface to facilitate comparison analysis.

In a practical application, the test picture obtaining module 71, the determining module 72, the color correction module 73, and the projection module 74 may each be a central processing unit (CPU) or a digital signal processing (DSP). Or a microprocessor (MPU, Micro Processor Unit) or a Field Programmable Gate Array (FPGA), etc.; the CPU, DSP, MPU, and FPGA can be built in the projection control device.

Embodiment 3:

The present embodiment provides a projection device, which may be a professional projector, or a mobile phone with a projection function, a mobile terminal such as a PAD, and the like, as shown in FIG. The image collector 92 and the processor 93; the projector in this embodiment includes a device such as a projection lamp. The image collector in this embodiment is mainly used for taking a picture, which may be a camera module. When the projection device is an existing projector, the image collector 92 can be added to the projection device in hardware and controlled by the processor, and the image data collected by the image collector 92 can be saved to the memory or memory of the projection device. When the projection device is a mobile phone with a projection function, a mobile terminal such as a PAD, it can be known that the camera itself is directly used as the image collector 92. Specifically, the projector 91 is configured to project full standard color content onto the projection surface; and the image collector 92 is configured to collect the current display content of the projection surface to obtain a projection surface test after the projector projects the full standard color content onto the projection surface. a processor 93 configured to test the image of the projection surface The color of the prime point is compared with a standard color (for example, white) to determine a non-standard color pixel point that requires color correction, color correction of the non-standard color pixel point to obtain a corrected color of each non-standard color pixel point, and the projector When the projection is officially projected on the projection surface, the projector is controlled to project the non-standard color pixel on the projection surface with a corresponding correction color. In the following, taking the projection device as an example, taking the projection surface as a projection wall as an example, the projection control process is exemplified:

1, photographing and getting the projection wall color (color card) process, as shown in Figure 10, including:

Step 1001: Initializing the pre-cured: color card range table: ColorRangeTable; color card conversion table: ColorTransformTable; initialization: projection wall color card, bgColorTbale[][]=null (initialization of the projection wall color card matrix form);

Step 1002: Projecting all white content onto the projection wall;

Step 1003: Taking a picture of the projection wall to obtain a test picture content bgBitmap of the projection wall;

Step 1004: cyclically detecting whether each pixel is a non-standard color pixel, and specifically circulating in the following manner:

For(x=0;x++;x<image length)

For(y=0;y++;y<image height)

PointColor=bgBitmap[x][y];

Step 1005: According to the RGB of PointColor, the color card range table can be searched to obtain the color card color Ck of the pixel point;

Step 1006: Determine whether Ck is white, if yes, bgColorTable[x][y]=null; otherwise, bgColorTable[x][y]=Ck;

Step 1007: Determine whether the loop ends or not to go to step 1004; otherwise, go to step 1008;

Step 1008: The process ends, and bgColorTable is a background wall color (color card) matrix (ie, shown in Table 3 in the first embodiment).

2. The color conversion and projection process of the projected content is shown in Figure 11, including:

Step 1101: Acquire a content image content cBitmap to be projected;

Step 1102: Perform a detection to obtain a color PC corresponding to the projected content of each pixel point, and the looping manner is as follows:

For(x=0;x++;x<image length)

For(y=0;y++;y<image height)

Content color: PC=cgBitmap[x][y];

Step 1103: Obtain a background color of the pixel: bgCk=bgColorTable[x][y];

Step 1104: Determine whether bgCk is empty, if yes, the content of the pixel is not modified, go to step 1102; otherwise, go to step 1105;

Step 1105: Obtain the corrected color Z: ColorTransformTable from the color card conversion table ColorTransformTable according to bgCK (background color) and PC (foreground color). [bcCk[[Ck], modification content:

cBitmap[x][y]=ColorTransformTable[bgCk[[Ck]

Step 1106: determining whether the loop ends, if not, then proceeding to step 1102; otherwise, proceeding to step 1107;

Step 1107: Project the converted content for these non-standard color pixel points: cBitmap.

Embodiment 4:

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the foregoing projection control method.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

Since the embodiment of the present invention performs color correction on non-standard color pixel points on the projection surface, and performs projection on the pixel points with the corrected color during projection, the influence of the non-standard color pixel points on the projection image can be reduced, The color reproduction degree of the projected image can be improved without a projection screen, or a projection screen, a stain on the projection wall, or a color of the ambient light. Improve the quality of the projections and increase the satisfaction of the user experience.

Claims (12)

A projection control method comprising: Projecting the full standard color content onto the projection surface, and then collecting the current display content of the projection surface to obtain a projection surface test image; Comparing the color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected; Performing color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point; When projecting on the projection surface, the non-standard color pixel points are projected with a corresponding corrected color. The projection control method according to claim 1, wherein said determining non-standard color pixel points requiring color correction comprises: Obtaining a color of each pixel of the projection surface test picture; Determining whether the color of each pixel is the same as the standard color, and if it is determined to be different, determining that the pixel is a non-standard color pixel; otherwise, determining that the pixel is a standard color pixel. The projection control method according to claim 1 or 2, wherein the color correction of the non-standard color pixel points comprises: Using the color of the non-standard color pixel point in the projection surface test picture as the background color of the pixel point; Obtaining a color corresponding to the content to be projected by the non-standard color pixel point as a foreground color of the pixel point; And determining, according to the background color and the foreground color of the non-standard color pixel point, a corresponding optimal display color as a corrected color of the pixel point in the preset color card conversion table; the color card conversion table includes each background color and The best display color for the foreground color. The projection control method according to claim 3, wherein the pre-set color card conversion table comprises: Selecting the color C _i as the background color from the standard color card range table, wherein the i is greater than or equal to 1, less than or equal to n, and the n is the total number of colors included in the standard color card range table; Using the background color and the standard color as test background colors of the first test projection surface and the second test projection surface, respectively; Selecting a color C _j as a foreground color from the standard color card range table, and projecting a test image onto the first test projection surface and the second test projection surface respectively with the foreground color content; the j is greater than or equal to 1 , less than or equal to n; Adjusting a color of the test image on the first test projection surface such that the display effect is consistent with the test image display effect on the second test projection surface, and correspondingly adjusting the final color as the background color and the foreground color The best display color Z _{ij is} recorded in the color card conversion table; or, Select color C _i as the background color from the standard color card range table; Using the background color as a test background color of the test projection surface; Selecting a color C _j as a foreground color from the standard color card range table, and projecting a test image onto the test projection surface with the foreground color content; Adjusting the color of the test image on the test projection surface to optimize the display effect, and recording the final adjusted color as the background color and the optimal display color Z _ij corresponding to the foreground color in the color card conversion table . The projection control method according to claim 1 or 2, wherein the standard color is white. A projection control device, the device comprising: a test picture acquisition module, a determination module, a color correction module, and a projection module; wherein The test picture acquisition module is configured to project full standard color content onto a projection surface, and collect The current display content of the projection surface is obtained by the projection surface test picture; The determining module is configured to compare a color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected; The color correction module is configured to perform color correction on the non-standard color pixel points to obtain a corrected color of each non-standard color pixel point; The projection module is configured to project the non-standard color pixel points with a corresponding corrected color when projecting on the projection surface. The projection control device according to claim 6, wherein the determination module comprises a color acquisition sub-module and a comparison sub-module; wherein The color acquisition sub-module is configured to acquire a color of each pixel of the test surface of the projection surface; The comparison sub-module is configured to determine whether the color of each pixel is the same as the standard color, and if it is determined to be different, determining that the pixel is a non-standard color pixel; otherwise, determining the pixel as a standard Color pixel points. The projection control device according to claim 6 or 7, wherein the color correction module comprises: a background color determination sub-module, a foreground color determination sub-module, and a lookup sub-module; The background color determining submodule is configured to use a color of the non-standard color pixel point in the projection surface test picture as a background color of the pixel point; The foreground color determining sub-module is configured to obtain a color corresponding to the content to be projected by the non-standard color pixel point as a foreground color of the pixel point; The locating sub-module is configured to find a corresponding optimal display color as a corrected color of the pixel according to the background color and the foreground color of the non-standard color pixel to the preset color card conversion table; The card conversion table contains the best display colors for each background color and foreground color. The projection control device according to claim 8, wherein said device further comprises a color card conversion table setting module, the color card conversion table setting module includes a first background color selection sub-module, a first test background color determination sub-module, a first foreground color selection sub-module, and a first adjustment sub-module; The first background color selection sub-module is configured to select a color C _i as a background color from a standard color card range table, wherein the i is greater than or equal to 1, less than or equal to n, and the n is the standard color card range table. The total number of colors included; The first test background color determining submodule is configured to use the background color and the standard color as test background colors of the first test projection surface and the second test projection surface, respectively; The first foreground color selection sub-module is configured to select a color C _j as a foreground color from the standard color card range table, and project a test image to the first test projection surface and the first The second test projection surface; the j is greater than or equal to 1, less than or equal to n; The first adjustment sub-module is configured to adjust a color of the test image on the first test projection surface to make the display effect the best or the display effect is consistent with the test image display effect on the second test projection surface, which will eventually Adjusting the color as the background color and the optimal display color Z _ij corresponding to the foreground color are recorded in the color card conversion table; Alternatively, the color card conversion table setting module includes a second background color selection sub-module, a second foreground color selection sub-module, a second test background color determination sub-module, and a second adjustment sub-module; The second background color selection submodule is configured to select a color C _i as a background color from a standard color card range table; The second test background color determining submodule is configured to use the background color as a test background color of the test projection surface; The second foreground color selection sub-module is configured to select a color C _j as a foreground color from the standard color card range table, and project a test image onto the test projection surface with the foreground color content; the j is greater than Equal to 1, less than or equal to n; The second adjustment submodule is configured to adjust a color of the test image on the test projection surface to optimize the display effect, and use the final adjusted color as the optimal display corresponding to the background color and the foreground color. The color Z _{ij is} recorded in the color card conversion table. A projection device, the device comprising a projector, an image collector and a processor; wherein The projector is configured to project full standard color content onto the projection surface; The image collector is configured to: after the projector projects the full standard color content onto the projection surface, collect the current display content of the projection surface to obtain a projection surface test image; The processor is configured to compare a color of each pixel of the projection surface test picture with the standard color to determine a non-standard color pixel point that needs to be color corrected, and perform color correction on the non-standard color pixel point A corrected color of each non-standard color pixel point is obtained, and when the projector is projected on the projection surface, the projector is controlled to project the non-standard color pixel point with a corresponding corrected color. The projection apparatus according to claim 10, wherein the image collector is a photographing module. A computer storage medium having stored therein computer executable instructions for performing the method of any one of claims 1 to 5.

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