CN109614064A - Picture display method, picture display device and terminal equipment - Google Patents

Abstract

The application provides a picture display method, a picture display device and a terminal device, wherein the picture display method is applied to the terminal device, the terminal device can correctly restore colors in a picture with a color gamut standard of a first color gamut, and the picture display method comprises the following steps: acquiring a picture to be displayed with a color gamut standard as a second color gamut, wherein a color space corresponding to the second color gamut is covered by a color space corresponding to the first color gamut; converting the picture to be displayed into an intermediate picture with the color gamut standard of the first color gamut; and displaying the intermediate picture. The method and the device can solve the technical problem that the current terminal equipment cannot efficiently restore the colors in the pictures with different color gamut standards to a certain extent.

Description

A picture display method, picture display device and terminal equipment

technical field

The present application belongs to the technical field of picture processing, and in particular, relates to a picture display method, a picture display device, a terminal device and a computer-readable storage medium.

Background technique

At present, most terminal devices on the market can only correctly restore the color gamut in a picture whose color gamut standard is a certain color gamut. For example, some terminal devices can only correctly restore the color gamut standard to sRGB (standard Red Green Blue, standard red Green and blue) color gamut in the picture, while other terminal devices can only correctly restore the color in the Adobe RGB color gamut picture.

In order to enable the terminal device to correctly restore the colors in pictures with different color gamut standards, the current conventional practice is to set the display system of the terminal device to various working modes, such as sRGB mode, DCI-P3 mode and AdobeRGB mode ( When the display system of the terminal device is set to a certain working mode, the terminal device can only correctly restore the color in the picture of the color gamut standard corresponding to the working mode), and the user manually changes the working mode of the terminal device display system, so that the The terminal device can correctly restore the colors in pictures of different color gamut standards.

It can be seen that, since the user is required to manually change the working mode of the display system of the terminal device, the current terminal device cannot efficiently restore the colors in pictures of different color gamut standards.

SUMMARY OF THE INVENTION

In view of this, the present application provides a picture display method, a picture display device, a terminal device and a computer-readable storage medium, which can solve the technical problem that the current terminal device cannot efficiently restore colors in pictures of different color gamut standards .

A first aspect of the present application provides a picture display method, which is applied to a terminal device. The terminal device can correctly restore the color in a picture whose color gamut standard is the first color gamut. The above picture display method includes:

obtaining a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut;

Converting the above-mentioned picture to be displayed into an intermediate picture whose color gamut standard is the above-mentioned first color gamut;

Show the middle picture above.

A second aspect of the present application provides a picture display device, which is applied to a terminal device. The terminal device can correctly restore colors in a picture whose color gamut standard is the first color gamut. The picture display device includes:

A picture acquisition module, configured to acquire a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut;

a color gamut conversion module, configured to convert the above-mentioned picture to be displayed into an intermediate picture whose color gamut standard is the above-mentioned first color gamut;

The picture display module is used to display the above-mentioned intermediate picture.

A third aspect of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the method in the first aspect when the processor executes the computer program. A step of.

A fourth aspect of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method of the first aspect are implemented.

A fifth aspect of the present application provides a computer program product, where the computer program product includes a computer program, and when the computer program is executed by one or more processors, the steps of the method of the first aspect are implemented.

As can be seen from the above, the present application provides a picture display method, and the picture display method is applied to a terminal device, and the terminal device can correctly restore the colors in a picture whose color gamut standard is the first color gamut. The picture display method provided by the present application first obtains a picture to be displayed, wherein the color gamut standard of the picture to be displayed is a second color gamut, and the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut, For example, if the above-mentioned first color gamut is the DCI-P3 color gamut, the second color gamut may be the sRGB color gamut (the color space corresponding to the sRGB color gamut is covered by the color space corresponding to the DCI-P3 color gamut); The acquired picture to be displayed is converted into an intermediate picture whose color gamut standard is the first color gamut, and then the intermediate picture is displayed. In this application, the color space corresponding to the second color gamut needs to be covered by the color space corresponding to the first color gamut, so that the color gamut of the picture to be displayed can be converted from the second color gamut to the first color gamut, and No color distortion. Each step in the technical solution provided by this application is performed by the terminal device, so that the terminal device that can correctly restore the color of the first color gamut picture, when receiving the second color gamut picture, can automatically use the second color gamut The picture is converted into an intermediate picture whose color gamut standard is the above-mentioned first color gamut, so that the terminal device can not only correctly restore the color in the picture of the first color gamut, but also can correctly restore the color in the picture of the second color gamut, The user does not need to change the working mode of the display system of the terminal device at all. Therefore, the present application can solve the technical problem that the current terminal device cannot efficiently restore the colors in pictures of different color gamut standards to a certain extent.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of an implementation flowchart of a picture display method provided in Embodiment 1 of the present application;

FIG. 2 is a schematic flowchart of the implementation of a color gamut conversion method provided in Embodiment 1 of the present application;

3 is a schematic diagram of a calculation method for an intermediate picture provided in Embodiment 1 of the present application;

Figure 4 is a schematic diagram of the color space corresponding to the sRGB color gamut;

FIG. 5 is a schematic flowchart of the implementation of another picture display method provided in Embodiment 2 of the present application;

FIG. 6 is a schematic structural diagram of a picture display device according to Embodiment 3 of the present application;

FIG. 7 is a schematic structural diagram of a terminal device provided in Embodiment 4 of the present application.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

The image display method provided by the embodiments of the present application may be applicable to terminal devices. Exemplarily, the above-mentioned terminal devices include but are not limited to: smart phones, tablet computers, desktop computers, learning machines, smart wearable devices, and the like.

It is to be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described feature, integer, step, operation, element and/or component, but does not exclude one or more other features , whole, step, operation, element, component and/or the presence or addition of a collection thereof.

It should also be understood that the terminology used in the specification of the application herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise.

It should also be further understood that, as used in this specification and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items .

In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In order to illustrate the technical solutions described in the present application, the following specific embodiments are used for description.

Example 1

A picture display method provided in Embodiment 1 of the present application is described below. The picture display method is applied to a terminal device, and the terminal device can correctly restore the color in a picture whose color gamut standard is the first color gamut (for example, manually by a user). Set the working mode of the terminal device display system so that the terminal device can correctly restore the color in the picture whose color gamut standard is the first color gamut), please refer to FIG. 1, the picture display method provided by the first embodiment of the present application includes:

In step S101, a picture to be displayed whose color gamut standard is a second color gamut is obtained, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the above-mentioned first color gamut;

In the embodiment of the present application, if the first color gamut is the Adobe RGB color gamut, the second color gamut may be the sRGB color gamut, and if the first color gamut is the DCI-P3 color gamut, the second color gamut Can also be sRGB color gamut. This application does not specifically limit the first color gamut and the second color gamut, but the relationship between the second color gamut and the first color gamut needs to be satisfied: the color space corresponding to the second color gamut The color space overlay corresponding to the color gamut.

In step S102, the above-mentioned to-be-displayed picture is converted into an intermediate picture whose color gamut standard is the above-mentioned first color gamut;

In the embodiment of the present application, it is necessary to perform color gamut conversion on the picture to be displayed obtained in step S101, so as to obtain an intermediate picture whose color gamut standard is the above-mentioned first color gamut. FIG. 2 shows the realization of a color gamut conversion method. A schematic flowchart, the middle picture in step S102 can be obtained according to FIG. 2 . As shown in FIG. 2, this step S102 may include steps S201-S205:

In step S201, the above-mentioned pictures to be displayed are normalized to obtain a normalized picture whose R value, G value and B value of each pixel are in the range of [0, 1];

In this step S201, normalization processing may be performed according to the number of bits of pixel values of pixels in the picture to be displayed. For example, if the R value, B value and G value of each pixel in the picture to be displayed are all 8 bits , then the R value, B value and G value of each pixel can be divided by 255, so as to obtain the normalization of the R value, B value and G value of each pixel in the range of [0,1] picture.

For a detailed description of the specific acquisition process of the middle picture shown in FIG. 2 , reference may be made to FIG. 3 . As shown in FIG. 3 , the picture to be displayed 301 is a 2×3 picture. The picture to be displayed 301 has a total of 6 pixels, and the R value, G value and B value of each pixel are 8 bits. The R value of the pixel point=180, the G value=234, and the B value=100. First, use this step S201 to normalize the to-be-displayed picture 301 to obtain a normalized picture 302. The R value of the first pixel of the normalized picture 302 = 180/255≈0.70588, and the G value = 234 /255≈0.91765, B value=100/255≈0.39216.

In step S202, linearly process the R value, G value and B value of each pixel in the normalized picture to obtain a linearly processed picture

After the normalized picture is obtained through step S201, the normalized picture is linearly processed to obtain a linearly processed picture. Wherein, in this step S202, a piecewise function shown in the following formula can be used to perform linear processing on the above-mentioned normalized picture, and the piecewise function is:

Among them, a=0.9479, b=0.05214, c=0.07739, d=0.04045, γ=2.4, U is the R value, G value or B value of the pixel in the above normalized picture, U_linear is the above linear processing picture For the R value, G value or B value of a pixel, those skilled in the art should note that this piecewise function is only an example of linear processing, and this application does not specifically limit the linear processing algorithm in this step.

It is assumed that the normalized picture 302 in FIG. 3 is linearly processed by using the above piecewise function, so as to obtain the linearly processed picture 303 . For the first pixel of the normalized picture 302, its R value ≈ 0.70588, G value ≈ 0.91765, and B value ≈ 0.39216. Therefore, according to the above piecewise function, the first pixel of the linearly processed picture 303 can be obtained. The R value of the pixel point=(a×0.70588+b) ^γ≈0.4565 , the G value=(a×0.91765+b) ^γ≈0.8229 , and the B value=(a×0.39216+b) ^γ≈0.1275 . The method for calculating the pixel values of other pixels in the linearly processed picture 303 will not be repeated here (indicated by ellipsis in FIG. 3 ).

In step S203, according to the first conversion formula, the color space of the above-mentioned linearly processed picture is converted from the color space corresponding to the above-mentioned second color gamut to the XYZ color space to obtain a first converted picture. The first conversion formula is: Wherein, M ₁ is a conversion matrix that converts the color space corresponding to the second color gamut to the XYZ space, is the pixel value of the pixel in the image after the above linear processing, is the pixel value of the pixel in the above-mentioned first converted picture;

In this step S203, the matrix M ₁ is a 3×3 matrix, and the matrix M ₁ is multiplied by the pixel value of each pixel of the linearly processed picture to obtain the first converted picture. As shown in FIG. 3 , the R value of the first pixel of the first converted picture 304 is M ₁ and a 3×1 matrix The first row of values after multiplication, the G value is M ₁ and a 3×1 matrix The value of the second row after multiplication, the B value is a matrix of M ₁ and 3 × 1 For the multiplied values in the third row, the calculation of the pixel values of other pixels in the picture 304 will not be repeated here.

In addition, in this step, M ₁ is a conversion matrix that converts the color space corresponding to the second color gamut to the XYZ space, and the acquisition process of M ₁ is briefly described below:

Wherein, _Xr =Rx/ _Ry , _Yr =1, _Zr =(1-Rx- _Ry )/ _Ry , _{Xg = Gx} / _Gy , _Yg = ₁ , _Zg =( 1-G _x -G _y )/G _y , X _b =B _x /B _y , Y _b =1, Z _b =(1-B _x -B _y )/B _y .

It can be seen that X _r , Y _r , Z _r , X _g , Y _g , Z _g , X _b , Y _b and Z _b in the calculation formula of M ₁ are based on R _x , R _y , G _x , G _y , B _x and By are obtained, wherein the R _x , _{R y , G x , G y , B x and By are the coordinates} in the normalized color space of the color space corresponding to the second color gamut. Assuming that the second color gamut is the sRGB color gamut, as shown in FIG. 4 , R _x and R _y are the horizontal and vertical coordinates of point A, R _x =0.64, R _y =0.33; G _x and G _y are B respectively The abscissa and ordinate of the point are G _x =0.30 and G _y =0.60; B _x and By are the abscissa and ordinate of point C respectively, B _{x =} 0.15 and _{By =} 0.06.

In addition, S _r , S _g and S _b in the calculation formula of M ₁ are calculated according to the following formula:

in, It can be the white point coordinates under the D65 light source, or it can be the white point coordinates under the D50 light source. is the white point coordinates under the D65 light source, then

The calculation process of the matrix M ₁ shown above is relatively complicated. Therefore, in order to save the running time of the terminal device, in practical applications, the matrix M ₁ can be calculated in advance, and M ₁ is stored locally in the terminal device. Correspondingly, in step Before S203, it may include: querying the conversion matrix M ₁ locally in the terminal device. Therefore, step S203 can be performed according to the queried M ₁ .

In step S204, according to the second conversion formula, the color space of the above-mentioned first conversion picture is converted from the XYZ color space to the color space corresponding to the above-mentioned first color gamut to obtain a second conversion picture. The second conversion formula is: Wherein, M ₂ is the conversion matrix that converts the color space corresponding to the first color gamut to the XYZ space, is the pixel value of the pixel in the above-mentioned first converted picture, is the pixel value of the pixel in the above-mentioned second converted picture;

In this step S204, the above ^- mentioned matrix _M2 is also a ₃ ×3 matrix, and the inverse matrix M2-1 of the matrix _M2 is multiplied by the pixel value of each pixel of the first converted picture obtained in step S203 , to get the second converted image. As shown in FIG. 3 , the R value of the first pixel of the second converted picture 305 is a matrix of M ₂ ^-1 M ₁ and 3×1 The value of the first row after multiplication, the G value is M ₂ ^-1 M ₁ and a 3×1 matrix The second row of values after multiplication, the B value is M ₂ ^-1 M ₁ and a 3×1 matrix For the multiplied values in the third row, the calculation of the pixel values of other pixels in the picture 305 will not be repeated here.

In this step, M ₂ is a conversion matrix that converts the color space corresponding to the first color gamut to XYZ space, and the specific calculation process is exactly the same as that of M ₁ . For details, please refer to the description of step S203, which will not be repeated here. Since the calculation process of the matrix M ₂ is also relatively complicated, in order to save the running time of the terminal device, in practical applications, the matrix M ₂ can be calculated in advance and stored _locally in the terminal device. Correspondingly, before step S204 , which may include: querying the matrix M ₂ locally in the terminal device, and calculating the inverse matrix M ₂ ^-1 of the queried matrix M ₂ . Therefore, step S204 can be performed according to M ₂ ^-1 .

Alternatively, the matrix M ₂ ^-1 can also be calculated in advance, and M ₂ ^-1 is directly stored locally in the terminal device. Correspondingly, before step S204 , it may include: querying the matrix M ₂ ^-1 locally in the terminal device. Therefore, step S204 can be performed according to the queried M ₂ ^-1 .

In step S205, inverse linear processing and inverse normalization processing are performed on the second converted picture to obtain an intermediate picture, wherein the inverse linear processing is an inverse operation of the linear processing, and the inverse normalization processing is the above normalization The inverse operation of the processing.

In this step, first perform inverse linear processing on the second converted picture obtained in step S204, and the inverse linear processing is an inverse operation of the linear processing described in step S202, and secondly, perform inverse normalization on the picture obtained by the inverse linear processing The inverse normalization process is an inverse operation of the above normalization process.

As shown in FIG. 3 , first, inverse linear processing is performed on the second converted picture 305 by using the inverse function of the piecewise function described in step S202, assuming that the inverse function of the piecewise function is f ⁻¹ (x) (the inverse function The calculation process is relatively conventional, and will not be repeated here, but only represented by f ^-1 (x)), then the R value of the first pixel of the inverse linearly processed picture 306 can be obtained as f ^-1 ( _{the second conversion} of R ), G value is f ^-1 (G _{second conversion} ), B value is f ^-1 (B _{second conversion} ), wherein R _{second conversion} , G _{second conversion} and B _{second conversion} are respectively The first row of values, the second row of values, and the third row of values. The calculation process of other pixel points of the picture 306 is not repeated here.

Next, inverse normalization is performed on the picture 306 , that is, the R value, the G value and the B value of each pixel are multiplied by 255, thereby obtaining the intermediate picture 307 .

In this embodiment of the present application, FIG. 2 shows a method for determining an intermediate picture. However, those skilled in the art should note that there may be other methods for determining the intermediate picture in step S102, which are not limited to the following methods. figure 2.

In step S103, the above-mentioned intermediate picture is displayed;

Since the technical solution provided in the present application is applied to a terminal device that can correctly restore the colors in the pictures in the first color gamut, the terminal device can correctly restore the colors in the intermediate pictures.

Those skilled in the art should note that, since the terminal device can correctly restore the colors in the picture of the first color gamut, the color space of the display of the terminal device must cover the color space corresponding to the first color gamut. The terminal device can display the intermediate picture by performing the following steps: First, the terminal device needs to convert the color space of the intermediate picture, and convert the color space of the intermediate picture from the color space corresponding to the first color gamut to the terminal device. The color space of the device display; secondly, the display picture is displayed on the display of the terminal device.

In the first embodiment of the present application, steps S101-S103 are performed by the terminal device, so that the terminal device that can correctly restore the color of the first color gamut picture, when receiving the second color gamut picture, can automatically use the second color gamut. The picture in the gamut is converted into an intermediate picture whose color gamut standard is the above-mentioned first color gamut, so that the terminal device can not only correctly restore the color in the picture in the first color gamut, but also can correctly restore the color in the picture in the second color gamut , and the user does not need to change the working mode of the display system of the terminal device. Therefore, the technical problem that the current terminal device cannot efficiently restore the colors in pictures of different color gamut standards can be solved to a certain extent.

Embodiment 2

The following describes another picture display method provided in the second embodiment of the present application. Similar to the first embodiment, the picture display method is also applied to the terminal device. In the second embodiment of the present application, the first color gamut in the first embodiment is limited to DCI-P3 color gamut, the second color gamut is limited to sRGB color gamut, the terminal device can correctly restore the color in the picture in the DCI-P3 color gamut, please refer to FIG. 5, the picture display method provided by the second embodiment of the present application include:

In step S501, an initial picture is obtained;

The initial picture described in this step S501 may be a picture taken by the user through the camera application (Application, APP) of the terminal device. For example, if the user starts the camera APP in the terminal device, and uses the camera APP to take a picture, the terminal device may The picture is determined as the initial picture; or, the above-mentioned initial picture may be a preview picture in the preview picture collected by the camera APP in the terminal device or the camera APP, for example, after the user starts the camera APP of the terminal device, the terminal device A certain frame of picture displayed on the display screen of the terminal device can be used as the initial picture; or, the above-mentioned initial picture can be a picture saved locally by the terminal device, for example, the terminal device can use a picture in the local gallery as the initial picture Or, the above-mentioned initial picture can also be a picture downloaded by the user on the Internet, for example, the terminal device determines the picture downloaded by the user in the browser as the initial picture; Or, the above-mentioned initial picture can also be a video watched online or saved locally A certain frame of picture in the video, for example, a certain frame of picture in the cartoon watched by the user online is determined as the initial picture. This application does not limit the source of the above-mentioned initial pictures.

In step S502, determine whether the color gamut standard of the above-mentioned initial picture is the sRGB color gamut;

The terminal device can determine whether the color gamut standard of the initial picture is the sRGB color gamut by acquiring the attribute information of the initial picture. the picture to be displayed, and execute steps S102-S103 in the first embodiment to display the initial picture.

If it is determined that the initial image is not in the sRGB color gamut, the initial image can be displayed directly without any processing. However, this will cause the displayed initial image to deviate from the color of the initial image itself. .

Or, if it is determined that the initial picture obtained in step S501 is not in the sRGB color gamut, it can be judged whether the color space corresponding to the color gamut of the initial picture is covered by the color space corresponding to the DCI-P3 color gamut. If the color space is covered, you can perform color gamut conversion on the initial picture, convert the initial picture into a picture whose color gamut standard is DCI-P3 color gamut, and then display the converted picture (the specific process of color gamut conversion). See Embodiment 1). If it is determined that the color space corresponding to DCI-P3 is not covered, the initial picture can be displayed directly.

In step S503, if the color gamut standard corresponding to the above-mentioned initial picture is the sRGB color gamut, then the initial picture is determined as the picture to be displayed;

In step S504, the above-mentioned picture to be displayed is converted into an intermediate picture whose color gamut standard is DCI-P3 color gamut;

In step S505, the above-mentioned intermediate picture is displayed;

That is, if the color gamut standard of the initial picture obtained in step S501 is the sRGB color gamut, then the initial picture is determined as the picture to be displayed according to the first embodiment, and steps S102-S103 in the first embodiment are executed to display. The initial picture. Wherein, in the second embodiment of the present application, the specific implementation process of steps S504-S505 is exactly the same as that of steps S102-S103 in the first embodiment, and details can be referred to the description of the first embodiment, which will not be repeated here.

In the second embodiment of the present application, the first color gamut in the first embodiment is specifically determined as the DCI-P3 color gamut, and the second color gamut is specifically determined as the sRGB color gamut, so that the terminal that can correctly restore the picture color of the DCI-P3 color gamut The device can also correctly restore the colors in the pictures in the sRGB color gamut without the need for the user to change the working mode of the terminal device display system. Therefore, the second embodiment of the present application is the same as the first embodiment, and it can also be To a certain extent, it solves the technical problem that the current terminal equipment cannot efficiently restore the colors in pictures of different color gamut standards

It should be understood that the size of the sequence numbers of the steps in the above method embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. .

Embodiment 3

The third embodiment of the present application provides a picture display device, which is applied to a terminal device. The terminal device can correctly restore the colors in a picture whose color gamut standard is the first color gamut. For the convenience of description, only the pictures related to the present application are shown. In part, as shown in FIG. 6, the picture display device 600 includes:

The picture acquisition module 601 is configured to acquire a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the above-mentioned first color gamut;

A color gamut conversion module 602, configured to convert the above-mentioned picture to be displayed into an intermediate picture whose color gamut standard is the above-mentioned first color gamut;

The picture display module 603 is configured to display the above-mentioned intermediate picture.

Optionally, the above-mentioned color gamut conversion module 602 includes:

a normalization processing unit, configured to perform normalization processing on the above-mentioned picture to be displayed, and obtain a normalized picture whose R value, G value and B value of each pixel are in the range of [0, 1];

The linear processing unit is used to perform linear processing on the R value, G value and B value of each pixel in the above-mentioned normalized picture to obtain a linearly processed picture;

The first conversion unit is configured to convert the color space of the above-mentioned linearly processed picture from the color space corresponding to the above-mentioned second color gamut to the XYZ color space according to a first conversion formula, and obtain a first conversion picture. The above-mentioned first conversion formula is: :

Wherein, M ₁ is a conversion matrix that converts the color space corresponding to the second color gamut to the XYZ space, is the pixel value of the pixel in the image after the above linear processing, is the pixel value of the pixel in the above-mentioned first converted picture;

The second conversion unit is configured to convert the color space of the first converted picture from the XYZ color space to the color space corresponding to the first color gamut according to the second conversion formula, so as to obtain a second converted picture. The second conversion formula is: :

Wherein, M ₂ is the conversion matrix that converts the color space corresponding to the first color gamut to the XYZ space, is the pixel value of the pixel in the above-mentioned first converted picture, is the pixel value of the pixel in the above-mentioned second converted picture;

The inverse processing unit is configured to perform inverse linear processing and inverse normalization processing on the above-mentioned second converted picture to obtain an intermediate picture, wherein the above-mentioned inverse linear processing is an inverse operation of the above-mentioned linear processing, and the above-mentioned inverse normalization processing is the above-mentioned normalization processing. The inverse operation of the normalization process.

Optionally, the above-mentioned linear processing unit is specifically used for:

According to the piecewise function, linearly process the R value, G value and B value of each pixel in the above normalized picture to obtain the linearly processed picture. The piecewise function is:

Among them, a=0.9479, b=0.05214, c=0.07739, d=0.04045, γ=2.4, U is the R value, G value or B value of the pixel in the above normalized picture, U_linear is the above linear processing picture The R value, G value or B value of the pixel.

Optionally, the terminal device locally stores a conversion matrix M ₁ for converting the color space corresponding to the second color gamut to the XYZ color space;

Correspondingly, the above-mentioned color gamut conversion module 602 further includes:

The first matrix query unit is configured to locally query the conversion matrix M ₁ for converting the color space corresponding to the second color gamut to the XYZ color space in the terminal device.

Optionally, the terminal device locally stores a conversion matrix M ₂ for converting the color space corresponding to the first color gamut to the XYZ color space;

Correspondingly, the above-mentioned color gamut conversion module 602 further includes:

a second matrix query unit, configured to locally query the conversion matrix M ₂ for converting the color space corresponding to the first color gamut to the XYZ color space in the terminal device;

The inverse matrix calculation unit is used to calculate the inverse matrix M ₂ ^-1 of the above matrix M ₂ .

Optionally, the above picture display apparatus 600 further includes:

The initial image acquisition module is used to acquire the initial image;

a color gamut standard judgment module, used to judge whether the color gamut standard of the above-mentioned initial picture is the above-mentioned second color gamut;

Correspondingly, the above-mentioned picture obtaining module 601 is specifically configured to: if the color gamut standard of the above-mentioned initial picture is the above-mentioned second color gamut, determine the above-mentioned initial picture as the above-mentioned picture to be displayed.

Optionally, the above picture display module 603 includes:

The color space transforming unit is used to transform the color space of the above-mentioned intermediate picture, and convert the color space of the above-mentioned intermediate picture from the color space corresponding to the above-mentioned first color gamut to the color space of the above-mentioned terminal device display, so as to obtain a display picture;

The display unit is used for displaying the above display picture.

It should be noted that the information exchange, execution process and other contents between the above-mentioned devices/modules/units are based on the same concept as the method embodiments of the present application. For specific functions and technical effects, please refer to the method embodiments section for details. , and will not be repeated here.

Embodiment 4

FIG. 7 is a schematic diagram of a terminal device provided in Embodiment 4 of the present application. The terminal device can correctly restore colors in a picture whose color gamut standard is the first color gamut. As shown in FIG. 7 , the terminal device 7 in this embodiment includes: a processor 70 , a memory 71 , and a computer program 72 stored in the above-mentioned memory 71 and executable on the above-mentioned processor 70 . When the above-mentioned processor 70 executes the above-mentioned computer program 72, the steps in the above-mentioned various method embodiments are implemented, for example, steps S101 to S103 shown in FIG. 1 . Alternatively, when the above-mentioned processor 70 executes the above-mentioned computer program 72, the functions of each module/unit in each of the above-mentioned apparatus embodiments, for example, the functions of the modules 601 to 603 shown in FIG. 6 are implemented.

Exemplarily, the above-mentioned computer program 72 can be divided into one or more modules/units, and the above-mentioned one or more modules/units are stored in the above-mentioned memory 71 and executed by the above-mentioned processor 70 to complete the present application. The above-mentioned one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the above-mentioned computer program 72 in the above-mentioned terminal device 7 . For example, the above-mentioned computer program 72 can be divided into a picture acquisition module, a color gamut conversion module and a picture display module, and the specific functions of each module are as follows:

obtaining a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut;

Converting the above-mentioned picture to be displayed into an intermediate picture whose color gamut standard is the above-mentioned first color gamut;

Show the middle picture above.

The above-mentioned terminal device may include, but is not limited to, the processor 70 and the memory 71 . Those skilled in the art can understand that FIG. 7 is only an example of the terminal device 7, and does not constitute a limitation on the terminal device 7, and may include more or less components than the one shown, or combine some components, or different components For example, the above-mentioned terminal device may also include input and output devices, network access devices, buses, and the like.

The so-called processor 70 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The above-mentioned memory 71 may be an internal storage unit of the above-mentioned terminal device 7 , such as a hard disk or a memory of the terminal device 7 . The above-mentioned memory 71 can also be an external storage device of the above-mentioned terminal device 7, such as a plug-in hard disk equipped on the above-mentioned terminal device 7, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, flash memory Card (Flash Card) and so on. Further, the above-mentioned memory 71 may also include both the internal storage unit of the above-mentioned terminal device 7 and an external storage device. The above-mentioned memory 71 is used to store the above-mentioned computer program and other programs and data required by the above-mentioned terminal device. The above-mentioned memory 71 can also be used to temporarily store data that has been output or is to be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the above device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the embodiments provided in this application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are only illustrative. For example, the division of the above modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or Components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.

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

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the above-mentioned integrated modules/units are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the present application realizes all or part of the processes in the methods of the above-mentioned embodiments, and can also be completed by instructing the relevant hardware through a computer program. The above-mentioned computer program can be stored in a computer-readable storage medium. The computer program When executed by a processor, the steps of each of the above method embodiments can be implemented. Wherein, the above-mentioned computer program includes computer program code, and the above-mentioned computer program code may be in the form of source code, object code form, executable file or some intermediate form. The above-mentioned computer-readable medium may include: any entity or device capable of carrying the above-mentioned computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random Access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content contained in the above-mentioned computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media does not Including electrical carrier signals and telecommunication signals.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that the above-mentioned embodiments can still be used for The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application, and should be included in the present application. within the scope of protection of the application.

Claims (10)

1. a picture display method, applied to terminal equipment, the terminal equipment can correctly restore the color gamut standard is the color in the picture of the first color gamut, it is characterized in that, described picture display method comprises: acquiring a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut; converting the picture to be displayed into an intermediate picture whose color gamut standard is the first color gamut; The intermediate picture is displayed. 2. The picture display method according to claim 1, wherein the converting the to-be-displayed picture into an intermediate picture whose color gamut standard is the first color gamut comprises: Normalize the picture to be displayed to obtain a normalized picture in which the R value, G value and B value of each pixel are in the range of [0, 1]; Perform linear processing on the R value, G value and B value of each pixel in the normalized picture to obtain a linearly processed picture; According to the first conversion formula, the color space of the linearly processed image is converted from the color space corresponding to the second color gamut to the XYZ color space to obtain a first converted image. The first conversion formula is: Wherein, M ₁ is a conversion matrix that converts the color space corresponding to the second color gamut to the XYZ space, is the pixel value of the pixel in the image after the linear processing, is the pixel value of the pixel in the first converted picture; According to the second conversion formula, the color space of the first conversion picture is converted from the XYZ color space to the color space corresponding to the first color gamut to obtain a second conversion picture. The second conversion formula is: Wherein, M ₂ is a conversion matrix that converts the color space corresponding to the first color gamut to XYZ space, is the pixel value of the pixel in the first converted picture, is the pixel value of the pixel in the second converted picture; Perform inverse linear processing and inverse normalization processing on the second converted picture to obtain an intermediate picture, wherein the inverse linear processing is an inverse operation of the linear processing, and the inverse normalization processing is the normalization The inverse operation of the processing. 3. The picture display method according to claim 2, wherein the R value, G value and B value of each pixel in the normalized picture are linearly processed to obtain a picture after linear processing, include: According to the piecewise function, linearly process the R value, G value and B value of each pixel in the normalized picture to obtain a picture after linear processing, and the piecewise function is: Among them, a=0.9479, b=0.05214, c=0.07739, d=0.04045, γ=2.4, U is the R value, G value or B value of the pixel in the normalized picture, U_linear is the linear processing The R value, G value or B value of the pixel in the picture. 4. The picture display method according to claim 2, wherein a conversion matrix M ₁ for converting a color space corresponding to the second color gamut to an XYZ color space is stored locally in the terminal device; Correspondingly, before the step of converting the color space of the linearly processed picture from the color space corresponding to the second color gamut to the XYZ color space according to the first conversion formula, and obtaining the first converted picture, further comprising: : A conversion matrix M ₁ for converting the color space corresponding to the second color gamut to the XYZ color space is queried locally on the terminal device. 5. The picture display method according to claim 2, wherein a conversion matrix M ₂ for converting a color space corresponding to the first color gamut to an XYZ color space is locally stored in the terminal device; Correspondingly, before the step of converting the color space of the first converted picture from the XYZ color space to the color space corresponding to the first color gamut according to the second conversion formula, and obtaining the second converted picture, further comprising: : Inquire locally on the terminal device a conversion matrix M ₂ for converting the color space corresponding to the first color gamut to the XYZ color space; The inverse matrix M ₂ ^-1 of the matrix M ₂ is calculated. 6. The picture display method according to any one of claims 1 to 5, wherein before the step of acquiring the picture to be displayed whose color gamut standard is the second color gamut, the method further comprises: Get the initial image; Determine whether the color gamut standard of the initial picture is the second color gamut; Correspondingly, acquiring a picture to be displayed whose color gamut standard is the second color gamut includes: If the color gamut standard of the initial picture is the second color gamut, the initial picture is determined as the picture to be displayed. 7. The picture display method according to any one of claims 1 to 5, wherein the displaying the intermediate picture comprises: Transforming the color space of the intermediate picture, converting the color space of the intermediate picture from the color space corresponding to the first color gamut to the color space of the terminal device display, to obtain a display picture; The display picture is displayed. 8. A picture display device, applied to a terminal device, the terminal device can correctly restore the color in a picture whose color gamut standard is a first color gamut, wherein the picture display device comprises: A picture acquisition module, configured to acquire a picture to be displayed whose color gamut standard is a second color gamut, wherein the color space corresponding to the second color gamut is covered by the color space corresponding to the first color gamut; a color gamut conversion module, configured to convert the to-be-displayed picture into an intermediate picture whose color gamut standard is the first color gamut; The picture display module is used for displaying the intermediate picture. 9. A terminal device, comprising a memory, a processor and a computer program stored in the memory and running on the processor, characterized in that, when the processor executes the computer program, the implementation as claimed in the claims Steps of the picture display method described in any one of 1 to 7. 10. A computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the picture display according to any one of claims 1 to 7 is realized steps of the method.