CN106409266A - Sub-pixel rendering and rendering device - Google Patents

Abstract

The present invention is applicable to the field of display technology, and provides a sub-pixel rendering method and device, including: obtaining the first grayscale values of the first pixels in the original image respectively in the three primary color components; obtaining the first compensation pixels in the four color components respectively According to the second grayscale value, calculate the third grayscale value of the second compensation pixel in the three primary color components and the first white component respectively, and calculate the third grayscale value of the first compensation pixel in the white component The second grayscale value is output as the third grayscale value of the second compensation pixel in the second white component; each third grayscale value is fused, and the fusion result is output as the RGB subpixel of the second pixel in the target image Gray scale value: outputting the third gray scale value of the second compensation pixel in the second white component as the gray scale value of the W sub-pixel of the second pixel. The invention retains the high-frequency part in the original image data, avoids the sudden drop of the edge sharpness of the image, and ensures a clearer image display effect after the rendering is completed.

Description

A sub-pixel rendering method and rendering device

technical field

The invention belongs to the field of display technology, and in particular relates to a sub-pixel rendering method and a rendering device.

Background technique

With the continuous improvement of the resolution of the LCD panel, the transmittance of the panel becomes lower and lower, and the area of each sub-pixel becomes smaller and smaller. Therefore, the yield rate of the LCD panel is greatly affected. . With the advancement of technology, a four-color RGBW panel based on Pentile pixel arrangement has been produced. In the pixel arrangement of the RGBW panel, each pixel is only composed of two sub-pixels, and the W white sub-pixel is added on the basis of the red, green and blue three sub-pixels of the original RGB panel, thus greatly improving the performance of the LCD panel. Excellent light transmittance and lower power consumption when displaying images with the same brightness, so RGBW panels occupy an important position in the LCD market.

Since the current image data is mainly for image data in RGB format, it is necessary to use a sub-pixel rendering method to realize the mapping and conversion from RGB sub-pixels to RGBW sub-pixels. However, using the existing sub-pixel rendering method to obtain the data of each sub-pixel in the RGBW panel will cause part of the high-frequency information in the original image data to be lost, reducing the edge sharpness of the image displayed on the RGBW panel.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a sub-pixel rendering method and a rendering device, aiming to solve the problems in the prior art that the high-frequency information in the original image data is partially lost and the edge sharpness of the image in the RGBW panel is reduced.

The embodiment of the present invention is implemented in this way, a sub-pixel rendering method, comprising:

Acquiring the first grayscale values of the first pixel in the original image respectively in three primary color components, the three primary color components including red component, green component and blue component;

Performing color gamut conversion processing on the first grayscale value to obtain second grayscale values of the first compensation pixel in four color components respectively, the four color components including the three primary color components and a white component;

According to the second grayscale value, calculate the third grayscale value of the second compensation pixel in the three primary color components and the first white component, and calculate the second grayscale value of the first compensation pixel in the white component The scale value output is the third gray scale value of the second compensation pixel in the second white component;

Fusing the third grayscale values of the second compensation pixel in the three primary color components and the first white component respectively, and outputting the fusion result as the grayscale value of the RGB sub-pixel of the second pixel in the target image;

outputting the second gray scale value of the second compensation pixel in the second white component as the gray scale value of the W sub-pixel of the second pixel.

Another object of the embodiments of the present invention is to provide a sub-pixel rendering device, including:

The first acquiring unit is configured to acquire the first grayscale values of the first pixel in the original image respectively in three primary color components, the three primary color components including red component, green component and blue component;

a conversion unit, configured to perform color gamut conversion processing on the first grayscale value, so as to obtain second grayscale values of the first compensation pixel respectively in four color components, the four color components including the three primary color components and white component;

The calculation unit is used to calculate the third gray scale value of the second compensation pixel respectively in the three primary color components and the first white component according to the second gray scale value, and calculate the third gray scale value of the first compensation pixel in the white component The output of the second grayscale value in is the third grayscale value of the second compensation pixel in the second white component;

A fusion unit, configured to fuse the third grayscale values of the second compensation pixel in the three primary color components and the first white component respectively, and output the fusion result as the RGB sub-pixel of the second pixel in the target image grayscale value;

An output unit, configured to output the second grayscale value of the second compensation pixel in the second white component as the grayscale value of the W subpixel of the second pixel.

In the embodiment of the present invention, multiple conversion and re-fusion processing are performed on the first grayscale values of the first pixel in the three primary color components in the original image, so that the grayscale value of the second pixel in the target image can be calculated based on the data obtained by direct sampling. The grayscale value of each sub-pixel avoids the steps of low-pass filtering, thereby retaining the high-frequency information in the original image data, avoiding the sharp drop of the edge sharpness of the image in the RGBW panel, thus ensuring the completion of pixel rendering After that, a clearer image display effect can be obtained.

Description of drawings

FIG. 1 is an implementation flow chart of a sub-pixel rendering method provided by an embodiment of the present invention;

FIG. 2 is a specific implementation flowchart of the sub-pixel rendering method S102 provided by the embodiment of the present invention;

FIG. 3 is a specific implementation flowchart of the sub-pixel rendering method S103 provided by the embodiment of the present invention;

Fig. 4 is an implementation flowchart of a sub-pixel rendering method provided by another embodiment of the present invention;

Fig. 5 is a pixel array in the first compensated image in a sub-pixel sharing mode provided by an embodiment of the present invention;

FIG. 6 is a specific implementation flowchart of the sub-pixel rendering method S104 provided by the embodiment of the present invention;

FIG. 7 is a schematic flowchart of a sub-pixel rendering method provided by an embodiment of the present invention;

Fig. 8 is a structural block diagram of a sub-pixel rendering device provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the embodiment of the present invention, multiple conversion and re-fusion processing are performed on the first grayscale values of the first pixel in the three primary color components in the original image, so that the grayscale value of the second pixel in the target image can be calculated based on the data obtained by direct sampling. The grayscale value of each sub-pixel avoids the steps of low-pass filtering, thereby retaining the high-frequency information in the original image data, avoiding the sharp drop of the edge sharpness of the image in the RGBW panel, thus ensuring the completion of pixel rendering After that, a clearer image display effect can be obtained.

Figure 1 shows the implementation process of the sub-pixel rendering method provided by the embodiment of the present invention, which is described in detail as follows:

In S101, the first gray scale values of the first pixel in the original image respectively in three primary color components are acquired, and the three primary color components include a red component, a green component and a blue component.

In this embodiment, the original image is an image based on the RGB color space, which can be displayed on an RGB panel in which RGB pixels are arranged. Each pixel is composed of three primary colors of red, blue, green, RGB, and each color on each pixel is called a sub-pixel. Therefore, each pixel is composed of red sub-pixels, green sub-pixels and blue sub-pixels.

Since the three sub-pixels have different color brightness levels, under the joint action of the three sub-pixels, the corresponding pixels can display different colors. Wherein, the size of the color brightness level is the gray scale value.

Obtain the first grayscale values of the first pixel in the original image in the three primary color components, that is, in the pixel array of the original image, obtain the first pixel in a specified row and column in the red component R, green component G and The gray scale values (R ₀ , G ₀ , B ₀ ) in the blue component B are the gray scale values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of the first pixel respectively.

In S102, color gamut conversion processing is performed on the first grayscale value to obtain second grayscale values of the first compensation pixel in four color components respectively, and the four color components include the three primary color components and white portion.

Since the original image data is image data under the RGB color space, it has only three color components. In this embodiment, a compensation component W ₁ is added to each pixel of the original image, so that each pixel can have four color components, and this pixel is called a first compensation pixel. Converting the first pixels in each original image into corresponding first compensation pixels, and arranging all the first compensation pixels according to the array positions of the first pixels can constitute a first compensation image corresponding to the first image.

Due to the mixing of the compensation component W1 in the _first compensation pixel, the total color information data owned by each pixel is more than the total color information data owned by the first pixel. In order to avoid color confusion in the image, add compensation At the same time as component W1, adjust the grayscale value of the _first compensation pixel in the three primary color components to ensure that the total amount of color information data is consistent with that in the original image. Convert the grayscale values (R ₀ , G ₀ , B ₀ ) of the three primary color components of the first pixel in the original image to the grayscale values (R ₁ , G ₁ , B ₁ ) of the first compensated pixel’s three primary color components and The process of compensating the grayscale value of the component W ₁ is the color gamut conversion process.

Specifically, as an embodiment of the present invention, as shown in FIG. 2, S102 includes:

In S201, a maximum value and a minimum value of the first grayscale value in the three primary color components are acquired.

There are three first grayscale values of the first pixel in the three primary color components, namely R ₀ , G ₀ , and B ₀ . The three grayscale values are specific numerical values, which can be compared in size. After the judgment and comparison, the largest gray-scale value and the smallest gray-scale value are selected among the three gray-scale values.

In S202, perform color gamut conversion processing on the first grayscale value according to a preset first conversion algorithm, where the first conversion algorithm includes:

Wherein, the gain is a compensation coefficient, and the min(R ₀ , G ₀ , B ₀ ) and max(R ₀ , G ₀ , B ₀ ) are respectively the maximum value and the minimum value of the first gray scale value, The R ₀ , G ₀ , and B ₀ are respectively the first grayscale values of the first pixel in the red component, the green component, and the blue component, and the R ₁ , G ₁ , B ₁ , and W ₁ are respectively The second gray scale value of the first compensation pixel in the red component, the green component, the blue component and the white component.

Substitute the first grayscale values collected in S101 into the corresponding parameters in the above formula, and calculate the grayscale value of the compensation component W1 added to the _first pixel after color gamut conversion according to the conversion algorithm and reduced grayscale values in the three primary color components. Thus, the gray scale value of the first compensation pixel corresponding to the first pixel on each color component is obtained, which is referred to as the second gray scale value.

In the embodiment of the present invention, the compensation component W ₁ is a white component. The backlight can only be transmitted from the panel through the filter, and the filter of the three primary color components can only transmit the corresponding three primary color light, and the light of other colors will be blocked by the filter, so it can finally pass through the color filter. The light energy of the light is only about 25% of the light energy, and after adding the white component in the first compensation pixel, the light of various colors can pass through smoothly, and there is almost no loss of light, so it is beneficial to improve the transmittance of the panel , thereby reducing the power of the backlight and obtaining higher brightness.

In S103, according to the second grayscale value, calculate the third grayscale value of the second compensation pixel in the three primary color components and the first white component respectively, and set the first compensation pixel in the white component The output of the second grayscale value of is the third grayscale value of the second compensation pixel in the second white component.

After the color gamut conversion of the first pixel is completed, the corresponding first compensation pixel is obtained, which includes (R ₁ , G ₁ , B ₁ , W ₁ ) four second grayscale values.

At this time, extract the second grayscale value of the first compensation pixel in the three primary color components, that is, R ₁ , G ₁ and B ₁ , convert the three data of R ₁ , G ₁ and B ₁ again, and keep the first compensation The second grayscale value W ₁ of the pixel in the white component. Therefore, after conversion, a second compensation pixel is obtained, and the pixel has five color components, which are three primary color components and two white components respectively. Correspondingly, the second compensation pixel has five third gray scale values (W ₂₁ , R ₂ , G ₂ , B ₂ , W ₂₂ ). Wherein, W ₂₂ =W ₁ , that is, the third grayscale value of the second compensation pixel in the second white component is the same as the second grayscale value of the first compensation pixel in the white component.

As an embodiment of the present invention, FIG. 3 shows a specific implementation flowchart of the sub-pixel rendering method S103 provided by the embodiment of the present invention, which is described in detail as follows:

In S301, a minimum value of the second gray scale value among the three primary color components is acquired.

There are three second grayscale values of the first compensation pixel in the three primary color components, namely R ₁ , G ₁ , and B ₁ . The three grayscale values are specific numerical values, which can be compared in size. After the judgment and comparison, among the three gray-scale values, the largest second gray-scale value and the smallest second gray-scale value are selected.

In S302, the second gray scale value is processed according to a preset second conversion algorithm, and the second conversion algorithm includes:

Wherein, the min(R ₁ , G ₁ , B ₁ ) is the minimum value of the second grayscale value, and the R ₁ , G ₁ , B ₁ , and W ₂₁ are respectively the red color of the second compensation pixel. component, green component, blue component, and the third grayscale value in the first white component.

Fig. 4 shows the implementation flow of the sub-pixel rendering method provided by another embodiment of the present invention, after S103, the method further includes:

In S401, acquire a color component corresponding to a shared sub-pixel between the second compensation pixel and an adjacent pixel, where the color component is one of the three primary color components.

One pixel in the RGBW panel corresponds to only two sub-pixels, one RGB sub-pixel and one W sub-pixel. In a pixel, it is impossible to rely on one RGB sub-pixel and one W sub-pixel to display various color information. Therefore, by sharing one RGB sub-pixel with adjacent pixels, it is possible to simulate high resolution at low resolution. Effect.

Fig. 5 shows a pixel array in a first compensated image in a sub-pixel sharing manner. As shown in Figure 5, the first compensation pixel to which any W sub-pixel belongs needs to borrow adjacent RGB sub-pixels, and the adjacent RGB sub-pixels are a color component that the first compensation pixel itself does not have. sub-pixels below.

To obtain the color components corresponding to the shared sub-pixels between the first compensation pixel and adjacent pixels, first find the adjacent pixels of the first compensation pixel in each direction, and then determine the distance between it and each adjacent pixel Which sub-pixels can be shared among them, so as to obtain the color components corresponding to the shared sub-pixels.

For example, in Fig. 5, assuming that the first compensation pixel where R', G', and B' sub-pixels are located is P(i, j), then the adjacent compensation pixels P(i, j) in each direction The pixels are: the lower adjacent pixel P(i+1,j), the left adjacent pixel P(i,j-1), and the right adjacent pixel P(i,j+1). It can be seen from the figure that the first compensation pixel P(i,j) shares the G' sub-pixel with the adjacent pixel P(i+1,j) below it, and the adjacent pixel P(i,j- 1) Share the R' sub-pixel, and share the B' sub-pixel with its right adjacent pixel P(i,j+1). For the shared sub-pixels R', G', B' in each direction, the corresponding color components are red component, green component and blue component respectively.

In S402, respectively acquire the third grayscale value of the second compensation pixel and its adjacent pixels in the color component, and re-determine the largest third grayscale value among them as the first grayscale value Second, compensate the third grayscale value of the pixel in the color component.

For the second compensation pixel and its adjacent pixels that share the red sub-pixel, the third grayscale values in the red component of these two pixels are obtained respectively. Since each pixel in the second compensated image is a second compensated pixel, and the third gray scale value of the second compensated pixel in the three primary color components has been obtained in S103. Therefore, for one of the second compensation pixels, its adjacent pixel is also another second compensation pixel in the image, and its third grayscale value can also be obtained through S103. In this step, the third grayscale values of the two pixels in the red component are read. Among the two read values obtained, if a larger third grayscale value is selected, the third grayscale value of the second compensation pixel in the red component is updated to the larger third grayscale value value.

Similarly, obtain the third grayscale value of the second compensation pixel and its adjacent pixels sharing the green sub-pixel in the green component, and re-determine the larger third grayscale value as the second compensation pixel in the green component the third grayscale value in the blue component; obtain the third grayscale value of the second compensation pixel and its adjacent pixels sharing the blue subpixel in the blue component, and re-determine the larger third grayscale value as The third grayscale value of the second compensation pixel in the blue component.

In this embodiment, the second grayscale value of the first compensation pixel in the white component is output as the third grayscale value of the second compensation pixel in the second white component.

If the above process is represented by parameter symbols, the details are as follows:

Among them, R' ₂ (i, j), G' ₂ (i, j), and B' ₂ (i, j) represent respectively: in the pixel array of the second compensation image, the second Compensating the third gray scale value re-determined by the pixel in the red component, the green component and the blue component;

R ₂ , G ₂ , and B ₂ represent respectively: in the pixel array of the second compensation image, the third gray scale values of the second compensation pixel in the red component, the green component and the blue component under the corresponding coordinates. For example, R ₂ (i, j-1) represents the third grayscale value in the red component of the second compensation pixel at row i and column j-1 in the pixel array of the second compensation image.

In this embodiment, if the sub-interpolation low-pass filter prototype R(i,j)=R(i-1,j)*a ₁ +R(i,j)*a ₂ +R(i+1, j)*a ₃ to represent the above-mentioned second conversion algorithm, it means that in this filter, the coefficients a ₁ =0, a ₂ =1, a ₃ =0 of the sub-pixel interpolation filter, thus indicating that, according to the direct The data obtained by sampling can directly calculate the adjusted third gray-scale values, avoiding the step of low-pass filtering, so as to obtain five third gray-scale values (W ₂₁ , R' ₂ , G' ₂ , B' ₂ , W ₂₂ ) of the second compensation pixel; since each third gray-scale value is the larger third gray-scale value of the second compensation pixel of the corresponding coordinates and the adjacent pixel, it is ensured that the adjusted The second compensation pixel can display better color and retain the color data in the original image to the greatest extent.

In S104, fuse the third grayscale values of the second compensation pixel in the three primary color components and the first white component respectively, and output the fusion result as the RGB sub-pixel of the second pixel in the target image grayscale value.

The third grayscale value of the second compensation pixel in the five color components is (W ₂₁ , R' ₂ , G' ₂ , B' ₂ , W ₂₂ ), and only four color components are provided in the RGBW panel, therefore, In this embodiment, the five third grayscale values of the second compensation pixel are converted into four grayscale values of the second pixel in the target image.

As an embodiment of the present invention, FIG. 6 shows a specific implementation flowchart of the sub-pixel rendering method S104 provided by the embodiment of the present invention, which is described in detail as follows:

In S601, respectively calculate the sum of the third grayscale value of the second compensation pixel in each color component and the third grayscale value of the second compensation pixel in the first white component, the The color component is one of the three primary color components.

In this embodiment, the color component means a red component, a green component or a blue component.

For the second compensation pixel, obtain the third grayscale value of the pixel in the red component and the third grayscale value in the first white component, and add and sum the two; obtain the pixel’s third grayscale value in the green component Add the three grayscale values and their third grayscale value in the first white component to the sum; get the third grayscale value of the pixel in the blue component and its third grayscale value in the first white component The grayscale value is summed by adding the two together.

In S602, the calculation result is output as the gray scale value of the RGB sub-pixel of the second pixel in the target image.

Through S601, each second compensation pixel can output three calculation results, representing the above three sum values. These three sums are respectively assigned to the grayscale values of the RGB sub-pixels in the second pixel. which is:

Among them, R ₂ (i,j), G ₂ (i,j), B ₂ (i,j), W ₂₁ (i,j) represent respectively: in the pixel array of the second compensation image, the i-th row The third grayscale value of the second compensation pixel in the j column in the red component, the green component, the blue component and the first white component;

R _out (i, j), G _out (i, j), B _out (i, j) respectively represent: in the pixel array of the target image, the second pixel in the i-th row and the j-th column is in the red component, the green component and grayscale values in the blue component.

If the third grayscale value of the second compensation pixel in the red component, the green component, the blue component and the first white component is the grayscale value adjusted in S402, the above process is expressed as:

The meanings represented by the parameters in the formula are the same as those in the above-mentioned embodiments, so the details are not repeated.

In S105, output the second grayscale value of the second compensation pixel in the second white component as the grayscale value of the W subpixel of the second pixel, that is, W _out (i, j ) = W ₂₂ .

According to the grayscale value of each sub-pixel, the brightness of the RGB sub-pixel and the W sub-pixel in the second pixel is adjusted to render each sub-pixel in the second image, so that the second pixel can be displayed in the second image of the RGBW panel.

The embodiment of the present invention makes the second pixel in the final output target image have only four color components, maintains the color information data in the original image, and retains the high-frequency information part in the original image data, avoiding the occurrence of This eliminates the defect of sudden drop in the edge sharpness of the image, so after the rendering of each sub-pixel of the image is completed, a clearer image display effect can be obtained.

Fig. 7 shows a schematic flowchart of a sub-pixel rendering method provided by an embodiment of the present invention. As shown in Figure 7, each first pixel in the original image is composed of three color components. After color gamut conversion, each first pixel is converted into a first compensation pixel composed of four color components, and white portion. Thereafter, according to the second grayscale value of the first compensation pixel in the three primary color components, the third grayscale value of the second compensation pixel in the three primary color components and the first white component in the second compensation image is calculated, which is The third grayscale value on the second white component is the same as the second grayscale value of the first compensation pixel in the white component. Finally, the five third grayscale values in the second compensation pixel are fused, and output as the grayscale value of each sub-pixel of the second pixel in the final target image, so that based on the RGB format data in the original image, the RGBW The effect of each sub-pixel is rendered in the panel.

It should be understood that in the embodiment of the present invention, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, rather than the implementation process of the embodiment of the present invention. constitute any limitation.

Corresponding to the sub-pixel rendering method provided by the embodiment of the present invention, FIG. 8 shows a structural block diagram of a sub-pixel rendering device provided by an embodiment of the present invention, which can run in a terminal device with a display screen, such as a smart phone , tablet, PDA, camera, etc. For ease of description, only the parts related to this embodiment are shown.

Referring to Figure 8, the device includes:

The first acquiring unit 81 is configured to acquire the first gray scale values of the first pixel in the original image respectively in three primary color components, and the three primary color components include a red component, a green component and a blue component.

A conversion unit 82, configured to perform color gamut conversion processing on the first grayscale value, so as to obtain second grayscale values of the first compensation pixel respectively in four color components, the four color components including the three primary color components and the white component.

The calculation unit 83 is configured to calculate the third gray scale value of the second compensation pixel in the three primary color components and the first white component respectively according to the second gray scale value, and calculate the third gray scale value of the first compensation pixel in the white color component. The second grayscale value in the component is output as the third grayscale value of the second compensation pixel in the second white component.

A fusion unit 84, configured to fuse the third grayscale values of the second compensation pixel in the three primary color components and the first white component, and output the fusion result as the RGB sub-value of the second pixel in the target image. The grayscale value of the pixel.

An output unit 85, configured to output the third grayscale value of the second compensation pixel in the second white component as the grayscale value of the W subpixel of the second pixel.

Optionally, the conversion unit 82 includes:

The first acquiring subunit is configured to acquire the maximum value and the minimum value of the first gray scale value in the three primary color components.

The first conversion subunit is configured to perform color gamut conversion processing on the first grayscale value according to a preset first conversion algorithm, the first conversion algorithm comprising:

Wherein, the gain is a compensation coefficient, and the min(R ₀ , G ₀ , B ₀ ) and max(R ₀ , G ₀ , B ₀ ) are respectively the maximum value and the minimum value of the first gray scale value, The R ₀ , G ₀ , and B ₀ are respectively the first grayscale values of the first pixel in the red component, the green component, and the blue component, and the R ₁ , G ₁ , B ₁ , and W ₁ are respectively The second gray scale value of the first compensation pixel in the red component, the green component, the blue component and the white component.

Optionally, the computing unit 83 includes:

The second acquiring subunit is configured to acquire the minimum value of the second grayscale value in the three primary color components.

The second conversion subunit is configured to process the second grayscale value according to a preset second conversion algorithm, and the second conversion algorithm includes:

Wherein, the min(R ₁ , G ₁ , B ₁ ) is the minimum value of the second grayscale value, and the R ₁ , G ₁ , B ₁ , and W ₂₁ are respectively the red color of the second compensation pixel. component, green component, blue component, and the third grayscale value in the first white component.

Optionally, the device also includes:

The second acquiring unit is configured to acquire a color component corresponding to a shared sub-pixel between the second compensation pixel and an adjacent pixel, where the color component is one of the three primary color components.

an adjusting unit, configured to respectively obtain the third grayscale value of the second compensation pixel and its adjacent pixels in the color component, and re-determine the largest third grayscale value among them as the The third grayscale value of the second compensation pixel in the color component.

Optionally, the fusion unit 84 includes:

a calculation subunit, configured to separately calculate the sum of the third grayscale value of the second compensation pixel in each color component and the third grayscale value of the second compensation pixel in the first white component, The color component is one of the three primary color components.

The second output subunit is configured to output the calculation result as the gray scale value of the RGB sub-pixel of the second pixel in the target image.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, 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. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be 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 integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

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. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a sub-pixel rendering intent is it is characterised in that include：

Obtain the first pixel the first grey decision-making in three primary colours component respectively in original image, described three primary colours component includes red Colouring component, green component and blue component；

Color gamut conversion process is carried out to described first grey decision-making, to obtain the first compensation pixel respectively in four colouring components second Grey decision-making, described four colouring components include described three primary colours component and white color component；

According to described second grey decision-making, calculate the second compensation pixel respectively in described three primary colours component and the first white color component The 3rd grey decision-making, and the second grey decision-making in white color component is output as described second retrieved image by described first compensation pixel 3rd grey decision-making in the second white color component for the element；

To described second compensation pixel, the 3rd grey decision-making in described three primary colours component and the first white color component is carried out respectively Merge, and fusion results are output as the grey decision-making of the RGB sub-pixel of the second pixel in target image；

Described second grey decision-making in described second white color component for described second compensation pixel is output as described second pixel W sub-pixel grey decision-making.

2. the method for claim 1 is it is characterised in that described carry out color gamut conversion process to described first grey decision-making, Included with obtaining the second grey decision-making respectively in four colouring components for first compensation pixel：

Obtain the maximum of the first grey decision-making and minimum of a value described in described three primary colours component；

Color gamut conversion process, described first transfer algorithm bag are carried out according to default first transfer algorithm to described first grey decision-making Include：

$\left\{\begin{array}{c}gain=1+min(R_0,G_0,B_0)/max(R_0,G_0,B_0)\\ W_1=min(R_0,G_0,B_0)\\ R_1=gain*R_0-W_1\\ G_1=gain*G_0-W_1\\ B_1=gain*B_0-W_1\end{array}\right.$

Wherein, described gain is penalty coefficient, described min (R₀,G₀,B₀) and max (R₀,G₀,B₀) it is respectively described first GTG The maximum of value and minimum of a value, described R₀、G₀、B₀It is respectively described first pixel in red component, green component and blueness The first grey decision-making in component, described R₁、G₁、B₁、W₁It is respectively described first compensation pixel in red component, green component, indigo plant The second grey decision-making in colouring component and white color component.

3. method as claimed in claim 2 it is characterised in that described according to described second grey decision-making, calculate the second retrieved image The 3rd grey decision-making in described three primary colours component and the first white color component includes element respectively：

Obtain the minimum of a value of the second grey decision-making described in described three primary colours component；

According to default second transfer algorithm, described second grey decision-making is processed, described second transfer algorithm includes：

$\left\{\begin{array}{c}{W}_{21}=min(R_1,G_1,B_1)\\ R_2=R_1-W_{21}\\ G_2=G_1-W_{21}\\ B_2=B_1-W_{21}\end{array}\right.$

Wherein, described min (R₁,G₁,B₁) be described second grey decision-making minimum of a value, described R₁、G₁、B₁、W₂₁It is respectively described the 3rd grey decision-making in red component, green component, blue component and the first white color component for two compensation pixels.

4. the method as described in any one of claims 1 to 3 is it is characterised in that in the second grey decision-making as described in described basis, calculate , respectively after the 3rd grey decision-making in described three primary colours component and the first white color component, methods described is also for second compensation pixel Including：

Obtain the color component corresponding to shared sub-pixel between described second compensation pixel and neighbor, described color divides Measure as one of described three primary colours component；

Obtain described second compensation pixel and its neighbor described 3rd grey decision-making in described color component respectively, and will Described in maximum of which, the 3rd grey decision-making redefines the 3rd GTG for described second compensation pixel in described color component Value.

5. method as claimed in claim 4 it is characterised in that described to described second compensation pixel respectively in described three primary colours The 3rd grey decision-making in component and the first white color component is merged, and fusion results are output as the second picture in target image The grey decision-making of the RGB sub-pixel of element includes：

Calculate the 3rd grey decision-making in each color component for described second compensation pixel and described second compensation pixel respectively The sum of the 3rd grey decision-making in described first white color component, described color component is one of described three primary colours component；

Described result of calculation is output as the grey decision-making of the RGB sub-pixel of the second pixel in described target image.

6. a sub-pixel rendering device is it is characterised in that include：

First acquisition unit, for obtaining the first pixel the first grey decision-making in three primary colours component respectively, institute in original image State three primary colours component and include red component, green component and blue component；

Converting unit, for carrying out color gamut conversion process to described first grey decision-making, to obtain the first compensation pixel respectively four The second grey decision-making in colouring component, described four colouring components include described three primary colours component and white color component；

Computing unit, for according to described second grey decision-making, calculate the second compensation pixel respectively in described three primary colours component and The 3rd grey decision-making in first white color component, and the second grey decision-making in white color component is output as by described first compensation pixel 3rd grey decision-making in the second white color component for described second compensation pixel；

Integrated unit, for described second compensation pixel respectively in described three primary colours component and the first white color component Three grey decision-making are merged, and fusion results are output as the grey decision-making of the RGB sub-pixel of the second pixel in target image；

Output unit, is output as described 3rd grey decision-making in described second white color component by described second compensation pixel The grey decision-making of the W sub-pixel of described second pixel.

7. device as claimed in claim 6 is it is characterised in that described converting unit includes：

First acquisition subelement, for obtaining the maximum of the first grey decision-making and minimum of a value described in described three primary colours component；

First conversion subunit, for carrying out at color gamut conversion to described first grey decision-making according to default first transfer algorithm Reason, described first transfer algorithm includes：

$\left\{\begin{array}{c}gain=1+min(R_0,G_0,B_0)/max(R_0,G_0,B_0)\\ W_1=min(R_0,G_0,B_0)\\ R_1=gain*R_0-W_1\\ G_1=gain*G_0-W_1\\ B_1=gain*B_0-W_1\end{array}\right.$

Wherein, described gain is penalty coefficient, described min (R₀,G₀,B₀) and max (R₀,G₀,B₀) it is respectively described first GTG The maximum of value and minimum of a value, described R₀、G₀、B₀It is respectively described first pixel in red component, green component and blueness The first grey decision-making in component, described R₁、G₁、B₁、W₁It is respectively described first compensation pixel in red component, green component, indigo plant The second grey decision-making in colouring component and white color component.

8. device as claimed in claim 7 is it is characterised in that described computing unit includes：

Second acquisition subelement, for obtaining the minimum of a value of the second grey decision-making described in described three primary colours component；

Second conversion subunit, for being processed to described second grey decision-making according to default second transfer algorithm, described Two transfer algorithms include：

$\left\{\begin{array}{c}{W}_{21}=min(R_1,G_1,B_1)\\ R_2=R_1-W_{21}\\ G_2=G_1-W_{21}\\ B_2=B_1-W_{21}\end{array}\right.$

Wherein, described min (R₁,G₁,B₁) be described second grey decision-making minimum of a value, described R₁、G₁、B₁、W₂₁It is respectively described the 3rd grey decision-making in red component, green component, blue component and the first white color component for two compensation pixels.

9. the device as described in any one of claim 6 to 8 is it is characterised in that described device also includes：

Second acquisition unit, for obtaining the color corresponding to the shared sub-pixel between described second compensation pixel and neighbor Color component, described color component is one of described three primary colours component；

Adjustment unit, for obtaining described second compensation pixel and its neighbor in described color component described respectively Three grey decision-making, and the 3rd grey decision-making described in maximum of which is redefined as described second compensation pixel in described color component In the 3rd grey decision-making.

10. device as claimed in claim 9 is it is characterised in that described integrated unit includes：

Computation subunit, for calculating the 3rd grey decision-making in each color component for described second compensation pixel and institute respectively State the sum of the 3rd grey decision-making in described first white color component for second compensation pixel, described color component divides for described three primary colours One of amount；

Second output subelement, for being output as the RGB sub-pixel of the second pixel in described target image by described result of calculation Grey decision-making.