CN113870769B

CN113870769B - Data processing method and system of display screen system

Info

Publication number: CN113870769B
Application number: CN202111117538.7A
Authority: CN
Inventors: 欧阳琴; 石昌金
Original assignee: Shenzhen Absen Optoelectronic Co Ltd
Current assignee: Shenzhen Absen Optoelectronic Co Ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2023-03-21
Anticipated expiration: 2041-09-23
Also published as: CN113870769A

Abstract

The embodiment of the application provides a data processing method and a data processing system of a display screen system, wherein the display screen system comprises a processor, a controller and a display screen, and the method comprises the following steps: identifying an image to be displayed through the processor, judging an identifier after identifying that the image to be displayed is a High Dynamic Range (HDR) image, and sending the image to be displayed to the controller; adjusting a transmission curve and a color gamut mapping relation corresponding to the display screen according to the performance parameters of the display screen, and sending the image to be displayed to the display screen; and the display screen displays the image to be displayed according to the adjusted transmission curve and the color gamut mapping relation. The method provided by the embodiment of the application can accurately restore the gray scale and the contrast of the image and improve the display effect of the display screen.

Description

Data processing method and system of display screen system

Technical Field

The present application relates to the field of computer technologies, and in particular, to a data processing method and system for a display screen system.

Background

With the development of industrial technology, the LED Display screen is widely used in people's industrial production and daily life, and compared with a conventional Liquid Crystal Display (LCD) Display screen, the LED Display screen has the characteristics of strong area ductility, strong interactivity, and more reduced Display effect. The LED display screen is generally formed by splicing a plurality of display modules, and is a self-luminous device, the maximum luminance can easily achieve more than 1000nits, the gray scale is usually 16bit, and can easily reach 18bit by relying on a dithering algorithm, and the color gamut is bright and closest to bt.2020, that is, the color gamut with a high-dynamic range (HDR), so the LED display screen is an ideal display for achieving HDR display effect in various display screens.

The LED display screen control system generally includes a video processor, a controller, and an LED display screen at a front end, where the video processor receives and processes various video signals, and then sends the video signals to the controller, and the controller sends the received video signals to a driver Integrated Circuit (IC) in the LED display screen, so as to implement image display.

HDR is a rendering method in graphics, and "dynamic range" refers to the number of gray levels between the brightest and darkest points in an image, the larger the dynamic range, the larger the brightness and contrast range in the image. Compared with the common image, the HDR image can provide more dynamic range and details, has data storage with larger brightness, can better reflect the visual effect in the real environment, makes the three-dimensional scene more vivid, greatly increases the three-dimensional virtual reality sense, and can accurately restore the HDR image on the LED display screen, thereby becoming the problem concerned by people.

The HDR technology is generally used to solve the problem of blurred images caused by insufficient detail of contrast and brightness processing, for example, when watching movies and televisions, some partial images cannot be seen in dark scenes, and shadow areas cannot be displayed, so that only a black area can be seen. By means of the HDR technology, the brightness, the contrast and the color range of videos and pictures can be greatly improved, dark part details of pictures can be better displayed, the image quality effect is effectively improved, and shadows cannot be displayed.

However, there is often a case that the contrast of the display screen does not match the contrast of an image to be displayed (such as an HDR video), so that the display effect of the display screen is poor. Therefore, how to improve the display effect of the display screen is an ongoing research issue for those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a data processing method and system of a display screen system, which can accurately restore the gray scale and the contrast of an image and effectively improve the display effect of a display screen.

In a first aspect, an embodiment of the present application provides a data processing method for a display screen system, where the display screen system includes a processor, a controller, and a display screen, and the method includes: identifying an image to be displayed through the processor, judging an identifier after identifying that the image to be displayed is an HDR image with a high dynamic range, and sending the image to be displayed to the controller; the controller adjusts the mapping relation between the transmission curve and the color gamut corresponding to the display screen according to the performance parameters of the display screen, and sends the image to be displayed to the display screen; and the display screen displays the image to be displayed according to the adjusted transmission curve and the color gamut mapping relation.

Generally, when a display screen, such as an LED display screen, plays an HDR video, color and contrast cannot be mapped correctly, and even the HDR video cannot be played normally. In view of this, the color gamut space and the transmission curve of the display screen are mapped reasonably, so that the display screen fully exerts its own performance, and the display effect of the HDR video is restored to the greatest extent. That is to say, in the embodiment of the present application, by adjusting the transmission curve and the color gamut mapping relationship corresponding to the display screen, when the to-be-displayed image is displayed on the display screen, the contrast of the to-be-displayed image being displayed can be effectively improved, the saturation of the to-be-displayed image can be accurately restored, the display effect is improved, and the user experience is improved.

In a possible implementation manner of the first aspect, the sending the image to be displayed to the controller includes: under the condition that the processor judges that the identifier of the image to be displayed is the PQ identifier, sending the image to be displayed and the metadata of the image to be displayed to the controller; the controller adjusting the transmission curve corresponding to the display screen according to the performance parameter of the display screen comprises: and adjusting the transmission curve corresponding to the display screen according to the metadata of the image to be displayed and the performance parameters of the display screen.

It should be understood that the above method is data processing based on PQ curve, wherein the metadata reflects the image information of the image to be displayed, and the transmission curve and the gamut mapping relationship of the display screen affect the effect of the image to be displayed on the display screen. In the embodiment of the application, the transmission curve of the display screen is adjusted by using the metadata, so that the display screen can correctly match the transmission characteristic of the HDR image according to the image information of the image to be displayed, the brightness of the image to be displayed on the display screen is adjusted, and the accuracy of image restoration is further improved.

In one possible implementation manner of the first aspect, the metadata of the image to be displayed includes: the display screen comprises a maximum frame average brightness level and/or a maximum content brightness level, and the performance parameters of the display screen comprise a maximum light-emitting brightness level.

In a possible implementation manner of the first aspect, adjusting the transmission curve corresponding to the display screen according to the metadata of the image to be displayed and the performance parameter of the display screen includes:

when the ratio of the maximum frame average brightness level to the maximum content brightness level is greater than a first ratio, determining a maximum brightness value according to the maximum brightness level and a first numerical value, and intercepting a PQ curve according to the maximum brightness value to obtain an adjusted transmission curve; or when the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than or equal to a first ratio and larger than a second ratio, determining a maximum brightness value according to the maximum brightness level and a second value, and intercepting a PQ curve according to the maximum brightness value to obtain an adjusted transmission curve; or when the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than a second ratio, determining a maximum brightness value according to the maximum brightness level, and intercepting a PQ curve according to the maximum brightness value to obtain an adjusted transmission curve.

In a possible implementation manner of the first aspect, the intercepting the PQ curve according to the maximum brightness value, and obtaining the adjusted transmission curve includes: and intercepting the PQ curve according to the maximum brightness value, and adjusting the curve of the low-gray part of the PQ curve according to the low-gray brightness curve of the display screen to obtain an adjusted transmission curve.

In a possible implementation manner of the first aspect, the adjusting, by the controller, the transmission curve corresponding to the display screen according to the performance parameter of the display screen includes: and under the condition that the processor judges that the identifier of the image to be displayed is the mixed logarithm gamma HLG identifier, adjusting a transmission curve corresponding to the display screen according to the performance parameters of the display screen and the ambient illumination.

In a possible implementation manner of the first aspect, the adjusting a transmission curve corresponding to the display screen according to the performance parameter of the display screen and the ambient illuminance includes: determining a target parameter according to the maximum brightness level of the display screen and the ambient illumination, determining an HLG curve according to the target parameter, and adjusting the curve of the low-gray part of the HLG curve according to the low-gray brightness curve of the display screen to obtain an adjusted transmission curve.

In a possible implementation manner of the first aspect, the adjusting, by the controller according to the performance parameter of the display screen, the color gamut mapping relationship corresponding to the display screen includes: and adjusting the color gamut mapping relation corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the image to be displayed.

In a possible implementation manner of the first aspect, the sending the image to be displayed to the controller includes: and the processor starts an HDR mode and sends the image to be displayed to the controller through a transmission mode of a target numerical value.

In a second aspect, an embodiment of the present application provides a display screen system, which includes a processor, a controller, and a display screen; the processor is used for identifying an image to be displayed, judging an identifier after identifying that the image to be displayed is a high dynamic range HDR image, and sending the image to be displayed to the controller; the controller is used for adjusting the mapping relation between the transmission curve and the color gamut corresponding to the display screen according to the performance parameters of the display screen and sending the image to be displayed to the display screen; and the display screen is used for displaying the image to be displayed according to the adjusted transmission curve and the color gamut mapping relation.

In a third aspect, the present application provides a computer-readable storage medium storing a computer program, where the computer program includes program instructions that, when executed, perform the method according to the first aspect or any one of the possible implementations.

In a fourth aspect, embodiments of the present application provide a computer program comprising instructions which, when run on a computer, cause the computer to perform the method according to the first aspect or any one of the possible implementations.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings used in the embodiments or the background art of the present application will be briefly described below.

Fig. 1 is a schematic diagram of an architecture of a display screen system according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of an architecture of a display screen system according to an embodiment of the present application;

FIG. 3 is a comparison graph of the effect of an HDR image that is not successfully restored and an HDR image that is successfully restored provided by an embodiment of the present application;

fig. 4 is a flowchart of a data processing method of a display screen system according to an embodiment of the present application;

fig. 5 is a flowchart of another data processing method of a display screen system according to an embodiment of the present application;

FIG. 6a is a diagram illustrating a variation of a PQ curve according to an embodiment of the present invention;

FIG. 6b is a schematic diagram illustrating another variation of a PQ curve according to an embodiment of the present invention;

FIG. 6c is a schematic diagram illustrating another variation of a PQ curve provided in an embodiment of the present application;

FIG. 7a is a comparison graph of HLG curves under maximum luminance of different display screens provided by the embodiment of the present application;

FIG. 7b is a comparison graph of HLG curves under different ambient illumination levels provided by the embodiments of the present application;

fig. 7c is a schematic diagram of an HLG curve provided in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described with reference to the accompanying drawings.

The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used only for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. Such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements recited, but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

In this application, "at least one" means one or more, "a plurality" means two or more, "at least two" means two or three and three or more, "and/or" for describing an association relationship of associated objects, which means that there may be three relationships, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one item(s) below" or similar expressions refer to any combination of these items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b," a and c, "" b and c, "or" a and b and c.

In order to more clearly describe the scheme of the present application, some knowledge related to the scheme is introduced below.

The embodiments of the present application will be described below with reference to the drawings.

Referring to fig. 1, fig. 1 is a schematic diagram of a display screen system according to an embodiment of the present disclosure. As shown in fig. 1, the architecture diagram includes an LED display screen, a control card, an LED screen control computer, a power supply, and a switch. The power supply is used for supplying power to the control card and the LED display screen, and a user can control the on and off of the power supply through the switch, so that the control card and the LED display screen are controlled to be started. The LED screen control computer is internally provided with upper computer software for parameter configuration of the LED screen, and the LED screen control computer can output video signals to the LED display screen, and the video signals are used for presenting corresponding image information through an LED module or a lamp panel in the LED display screen. The LED screen control computer is connected with the control card through a network, and data transmission can be carried out between the LED screen control computer and the control card through a High Definition Multimedia Interface (HDMI), a display interface (DP) and a Digital Video Interface (DVI) or a network interface. The internal structure of the control card mainly includes a Micro Controller Unit (MCU) and a Field Programmable Gate Array (FPGA). The MCU is used for processing test parameters and monitoring the working condition of the whole LED display screen box body, and the FPGA is used for receiving video signals sent by the LED screen control computer and driving a lamp panel of the LED display screen to display images corresponding to the video signals. The control card can forward the video signal of the LED screen control computer to the receiving card of the LED display screen after obtaining the power supply of the power supply to start, and the video signal forwarded by the control card is a parallel video signal. The LED display screen can start a driving module in the LED display screen after power supply of a power supply is obtained, so that an LED module or a lamp panel in the LED display screen is started, the driving module in the LED display screen receives parallel video signals sent by a control card and converts the parallel video signals into serial video signals which can be identified by the LED display screen, the serial video signals are transmitted to the LED display screen, and after the LED display screen receives the serial video signals, the LED lamp beads are lightened and image information corresponding to the serial video signals is displayed.

Optionally, the architecture diagram may further include a power management module and a switch corresponding thereto, wherein the control card and the LED display screen each include a power supply for supplying power to the control card and the LED display screen. A user can control the control signal transmission of the power supply management module through the switch, and the control signal can be used for controlling the on and off of the power supply for the control card and the LED display screen, so that the effect of indirectly controlling the start of the control card and the LED display screen is achieved. Specifically, the control signal sent by the power management module may also be used to control the start timing of the power supplies for the control card and the LED display screen, that is, the control card and the LED display screen may be controlled to start in different timings.

Based on the above-mentioned architecture of the LED display screen system provided in fig. 1, the HDR technology can be used to solve the picture blur caused by the lack of detail of the contrast and the brightness processing, however, there is a case that the contrast of the display screen is not matched with the contrast of the image to be displayed (such as the HDR video), so that the display effect of the display screen is not good.

In view of this, the present application provides a data processing method and system for a display screen system. The color gamut space and the transmission curve of the display screen are reasonably mapped, so that the display screen can fully exert the performance of the display screen, the display effect of the HDR video is restored to the maximum extent, and the optimal watching effect of human eyes is ensured.

Fig. 2 is a schematic diagram of a data processing architecture of a display screen system according to an embodiment of the present disclosure, and as shown in fig. 2, the display screen system includes a processor (fig. 2 illustrates a video processor), a controller, and a display screen. Optionally, the display screen system further includes an Integrated Circuit (IC).

Illustratively, the video processor recognizes receiving and processing the HDR video signal, extracts metadata content in the HDR video, and sends the HDR video signal and the metadata information to the controller. The controller adjusts the mapping relation between the transmission curve and the color gamut corresponding to the display screen according to the received metadata information, and then sends the video signal to a driving IC in the display screen, so that the HDR video is correctly displayed. Illustratively, the display screen comprises an LED display screen. Exemplarily, an LED display screen is formed by splicing a plurality of display modules, and is a self-luminous device, the maximum luminance can be easily realized to be more than 1000nits, the gray scale is usually 16bit, 18bit can be easily reached by relying on a dithering algorithm, the color is bright, the color gamut is closest to bt.2020, and the LED display screen is an optimal display for realizing the HDR display effect among various display screens. It is to be understood that the processor and the controller shown in the embodiments of the present application may be included in the same device, or may be included in different devices, and the like, and the embodiments of the present application are not limited thereto.

Alternatively, the system shown in fig. 2 may be applied to the case where the identifier of the HDR video signal is a PQ identifier. Alternatively, the system shown in fig. 2 may also be applied to the case where the identifier of the HDR video signal is an HLG identifier. For example, fast tone mapping is performed according to metadata in an HDR video and performance parameters of a display screen, and when the metadata is changed or the display screen is replaced, a tone mapping curve is automatically changed, so that the contrast of a real-time playing video is closest to the intention of a video creator on the premise of ensuring high-efficiency display of an LED display screen.

As shown in fig. 3, fig. 3 may represent a comparison of an HDR image that was not successfully restored (a graph shown on the left of fig. 3) with an HDR image that was successfully restored (a graph shown on the right of fig. 3). As can be seen from the graph shown on the left side of fig. 3, the LED display screen picture which cannot correctly display the HDR image is whitish and grey in color. The data processing method shown in the embodiment of the application can correctly display the LED display screen (as shown in the right side of the figure 3) of the HDR image video, and the image contrast of the LED display screen is very high, and the color saturation is normal and is close to that of the LED display screen when the human eyes actually observe the HDR image video.

It is understood that the specific description with respect to fig. 2 or fig. 3 may also refer to method embodiments shown below, such as fig. 4 and fig. 5, etc.

Fig. 4 is a flowchart of a data processing method of a display screen system according to an embodiment of the present application. It is understood that the detailed description of the display screen system can refer to fig. 2, and will not be described in detail here. As shown in fig. 4, the method includes:

401. and identifying the image to be displayed through the processor, judging the identifier after identifying that the image to be displayed is the HDR image with the high dynamic range, and sending the image to be displayed to the controller.

In the embodiment of the present application, the processor may be a video processor, an image processor, or the like, and the embodiment of the present application is not limited to the type of the processor.

In the embodiment of the present application, the image to be displayed may be a frame image or a static image of multiple frames. Alternatively, the image to be displayed may be a dynamic image including a plurality of frames. That is to say, the image to be displayed shown in the embodiment of the present application may be one or more photos, or may be a video, and the like, which is not limited in the embodiment of the present application.

In the embodiment of the application, when the image to be displayed is an HDR image, the processor determines that the identifier may obtain that the identifier of the image to be displayed is a PQ identifier or an HLG identifier.

Optionally, the sending, by the determination identifier, the image to be displayed to the controller includes: and judging the identifier, and sending the image to be displayed and the metadata of the image to be displayed to the controller when the processor judges that the identifier of the image to be displayed is the PQ identifier.

That is, when the identifier is the PQ identifier, the processor may transmit the image to be displayed and metadata of the image to be displayed to the controller.

Optionally, the sending, by the determination identifier, the image to be displayed to the controller includes: and judging the identifier, and sending the image to be displayed to the controller under the condition that the processor judges that the identifier of the image to be displayed is the HLG identifier.

That is, when the identifier is the HLG identifier, the processor may transmit the image to be displayed to the controller.

402. And adjusting the mapping relation between the transmission curve corresponding to the display screen and the color gamut according to the performance parameters of the display screen, and sending the image to be displayed to the display screen.

Optionally, the controller may adjust the transmission curve corresponding to the display screen first, and then adjust the color gamut mapping relationship corresponding to the display screen. Optionally, the controller may adjust the color gamut mapping relationship corresponding to the display screen first, and then adjust the transmission curve corresponding to the display screen. Optionally, the controller may also adjust a transmission curve and a color gamut mapping relationship corresponding to the display screen at the same time. The sequence of the above steps is not limited in the embodiments of the present application. For convenience of description, the method provided by the embodiment of the present application will be described below by taking an example in which the controller performs the color gamut space mapping first and then adjusts the transmission curve of the display screen.

Generally, the performance parameters of the display screen can be set at the time of factory shipment. For example, the display screen system may obtain performance parameters of the display screen through an interface with the display screen (e.g., a controller in the display screen system may be connected to the display screen, etc.). For another example, the performance parameters of the display screen may be stored in advance in the display screen system. The embodiment of the present application does not limit the specific manner in which the display screen system acquires the performance parameters of the display screen. It should be understood that the performance parameters of the display screen described above include, but are not limited to, the maximum light emission brightness of the display screen and the color gamut information of the display screen. Optionally, the performance parameter of the display screen may further include any one or more of a gray scale of the display screen or a driving manner of the display screen. For example, when the gray scales of the display screen are different, the maximum gamma values corresponding to the curves used when gamma correction is performed in the controller of the LED display screen are different.

Optionally, when the identifier is determined to be the PQ identifier, the adjusting, by the controller, the transmission curve corresponding to the display screen according to the performance parameter of the display screen includes: and adjusting the transmission curve corresponding to the display screen according to the metadata of the image to be displayed and the performance parameters of the display screen. Wherein the metadata of the image to be displayed includes: the maximum frame average brightness level and/or the maximum content brightness level, and the performance parameters of the display screen comprise the maximum light-emitting brightness level.

Illustratively, the maximum content brightness level represents the brightness value of the brightest pixel point in the image to be displayed, the maximum frame average brightness level represents the maximum brightness value of the average frame brightness corresponding to at least one frame in the image to be displayed, and the average frame brightness represents the average brightness value of all pixel points in one frame. It is understood that the embodiment of the present application does not limit other information included in the metadata. For example, the maximum brightness of the image to be displayed may also be included in the metadata. The maximum brightness of the image to be displayed is related to the color gamut information of the image to be displayed.

Optionally, when the identifier is determined to be the HLG identifier, the adjusting, by the controller, the transmission curve corresponding to the display screen according to the performance parameter of the display screen includes: and adjusting the transmission curve corresponding to the display screen according to the performance parameters of the display screen and the ambient illumination. The performance parameters of the display screen comprise the maximum light-emitting brightness level.

Optionally, the adjusting, by the controller, the gamut mapping relationship corresponding to the display screen according to the performance parameter of the display screen includes: and adjusting the color gamut mapping relation corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the image to be displayed.

For example, when the identifier determined by the processor is the PQ identifier, the controller may adjust the gamut mapping relationship corresponding to the display screen according to the gamut space of the display screen and the metadata information (e.g., the gamut space of the image to be displayed). For example, when the identifier determined by the processor is the HLG identifier, the controller may adjust the color gamut mapping relationship corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the image to be displayed.

For example, to achieve HDR display effect, it is necessary to recognize and decode an HDR signal, and when a captured/created color gamut (mother color gamut) is identical to a display color gamut, colors of a subject can be correctly restored, and when the mother color gamut is different from the display color gamut, the restored colors may have distorted hue or color saturation. When the display color gamut is smaller than the mother color gamut, the displayed color saturation is lower than the actual scene color saturation, when the display color gamut is larger than the shooting color gamut, the displayed color saturation is higher than the actual scene color saturation, and the displayed color saturation is the same as the actual scene color saturation only when the shooting and display color gamuts are the same. When the color gamut is different, color gamut conversion is required. The dynamic range and color gamut of the LED display screen should be mapped correctly with the standard dynamic range and color gamut in the corresponding HDR. Namely, the display screen system shown in the embodiment of the application can effectively enhance the display effect of the HDR image. According to the method in the embodiment of the application, when the image to be displayed is the HDR video, the color gamut space of the display screen is subjected to color gamut mapping, so that the color of the HDR video can be correctly restored. Meanwhile, the gamma curve of the display screen is subjected to tone mapping, so that the transmission characteristic of the HDR video can be correctly matched, and the brightness and the contrast of the HDR video can be restored.

It is understood that the detailed description of step 402 can also refer to the description of fig. 5, which is not detailed herein.

403. And the display screen displays the image to be displayed according to the mapping relation between the adjusted transmission curve and the color gamut.

In the embodiment of the application, the transmission curve and the color gamut mapping relation corresponding to the display screen are adjusted, when the image to be displayed is displayed through the display screen, the contrast of the displayed image to be displayed can be effectively improved, the saturation of the image to be displayed can be accurately reduced, the display effect is improved, and the user experience is improved.

For convenience of description, the method provided by the embodiment of the present application will be described below by taking an image to be displayed as an HDR video source as an example. Fig. 5 is a flowchart of another data processing method of a display screen system according to an embodiment of the present application, where the method includes:

501. judging whether the input video source is an HDR video source, if so, executing a step 503; if not, go to step 502.

For example, determining whether the input video source is an HDR video source may be performed by a processor. HDR video sources include HDR video sources based on PQ curves and HDR video sources based on HLG curves. Exemplary, input video sources include, but are not limited to, HDR video and SDR video.

502. The transmission is decoded normally.

For non-HDR video sources, the video information is less, the color gamut is small, the brightness is low, special processing is not needed, and the processor can perform transmission through decoding.

503. The HDR mode is turned on, and the identifier is determined.

Illustratively, when the processor identifies the input video source as an HDR video source, the determined identifiers include, but are not limited to, a PQ identifier and an HLG identifier.

504. And acquiring video metadata under the condition that the identifier is a PQ identifier, starting a transmission mode by the processor, changing a tone mapping curve into a PQ transmission curve, and carrying out color gamut space mapping according to metadata information.

The processor may extract video metadata from the video source when the identifier is a PQ identifier. The processor sends the video metadata and the video source to the controller. Illustratively, the video metadata includes, but is not limited to, a maximum content brightness level and a maximum frame average brightness level, the maximum content brightness level represents a brightness value of a brightest pixel point in the image to be displayed, the maximum frame average brightness level represents a maximum brightness value of an average frame brightness corresponding to at least one frame in the image to be displayed, and the average frame brightness represents an average brightness value of all pixel points in one frame.

Illustratively, the processor turning on the transmission mode includes: the processor may turn on a 10-bit transmission mode or a 12-bit transmission mode, and the like, which is not limited in this embodiment. For example, the processor turning on the transmission mode may also be understood as: the processor starts the HDR mode and sends the HDR video source to the controller through the transmission mode of the target value. It is understood that the processor may be controlled by the controller to enable the HDR mode, such as transmission via a 10bit transmission mode.

Because the video is affected by various factors in the transmission process, the problems that the image is distorted and the detail information cannot be displayed exist, the color of the image displayed on the display screen can be adjusted through color gamut mapping, and the brightness of the display screen can be adjusted through a tone curve. Illustratively, the controller changes the tone mapping curve to the PQ transmission curve, and the display screen performs gamut space mapping according to metadata information (e.g., the gamut space of the HDR video source).

505. And adjusting the transmission curve according to the highest brightness of the display screen, the metadata of the HDR video and the low gray brightness curve of the display screen.

The maximum brightness of the display screen is influenced by the performance of the display screen, different display screens have different maximum brightness, the maximum brightness can influence the display of a video source on the display screen, and if the maximum content brightness level of the video source is greater than the maximum brightness of the display screen, partial images of the video source can not be accurately displayed. The low gray portion is a portion having a luminance lower than the lowest display of the display screen, and the luminance correspondence relationship of the low gray portion is adjusted so that an image of the low gray portion can be displayed. Illustratively, the transmission curve is adjusted by the controller according to the maximum luminance of the display screen, the metadata of the HDR video, and the low gray luminance profile of the display screen.

It is understood that the specific description of step 504 and step 505 may refer to the methods illustrated below, which are not detailed herein.

506. And the controller transmits the processed video data to the driving IC for display.

The display drive IC is responsible for imaging of the display screen and mainly comprises a light emitting diode, and the drive IC acquires video data processed by the controller and displays the video data according to the video data.

507. And under the condition that the identifier is the HLG identifier, the processor starts a transmission mode, the tone mapping curve is changed into the HLG curve, and the color gamut space mapping is carried out according to the color gamut space of the display screen and the color gamut space of the video source.

And in the case that the identifier is the HLG identifier, the controller changes the tone mapping curve into the HLG curve and adjusts the color gamut mapping relation according to the color gamut space of the display screen and the color gamut space of the HDR video source. The HLG curve is a variable curve and is changed under the influence of the maximum brightness of the display screen.

It is understood that the specific description of the processor turning on the transmission mode, the gamut space mapping, etc. can refer to the above description of step 504, and will not be described in detail here.

508. And adjusting the transmission curve according to the maximum brightness of the display screen, the illumination of the viewing environment and the low gray brightness curve of the display screen.

The maximum brightness of the display screen and the illumination of the watching environment influence the HLG curve, and the larger the brightness of the display screen is, the larger the illumination of the watching environment is, and the larger the transmission curve parameter is. Illustratively, the controller adjusts the transmission curve according to a maximum brightness of the display screen, an illumination of the viewing environment, and a low gray brightness profile of the display screen. It is understood that the maximum brightness of the display screen shown in the embodiment of the present application may also be referred to as a maximum light-emitting brightness level or a maximum light-emitting brightness of the display screen, and the present application does not limit the name.

It is understood that the specific description of step 507 and step 508 may refer to the methods shown below, and will not be described herein.

509. And the controller transmits the processed video data to the driving IC for display.

Illustratively, the processed video data includes an adjusted transmission curve, such as an adjusted PQ transmission curve or an adjusted HLG transmission curve; and may also include an adjusted gamut mapping relationship.

According to the method provided by the embodiment of the application, the transmission curve and the color gamut mapping mode are adjusted according to the type of the input video source, and the video transmission mode is automatically changed, so that the contrast of the real-time playing video is closest to the intention of a video creator on the premise of ensuring high-efficiency display of an LED display screen.

According to the embodiment of the application, the video transmission mode and the signal processing method can be automatically changed according to the type of the input video source, and then the transmission curve of the display screen is adjusted according to the metadata of specific video transmission, so that the HDR display effect can be correctly restored by the display screen under the best performance of the display screen, and the best watching effect of human eyes is ensured. When the input signal is an HDR video source signal subjected to OETF coding according to a PQ curve, in combination with the methods shown in fig. 4 and 5, the data processing method shown in the embodiment of the present application includes:

calibrating the gray level, the maximum brightness and the color gamut of the display screen to obtain the performance parameters of the display screen; then, according to an identifier of an input signal (e.g., an identifier of an image to be displayed or an identifier of a video source), the display screen enters the HDR PQ mode, performs color gamut conversion and transmission curve selection according to the maximum luminance and color space of the HDR signal source, and adjusts a mapping curve according to the maximum content luminance level and the maximum frame average luminance.

That is, when the identifier is determined to be the PQ identifier, the transmission curve corresponding to the display screen may be adjusted according to the relationship between the maximum content brightness level and the maximum frame average brightness level. And adjusting the color gamut mapping relation corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the HDR video source.

For example, after the processor acquires the image to be displayed, an identifier of the image to be displayed may be extracted, and in the case that the identifier of the image to be displayed is PQ, a perceptual quantization curve PQ curve may be determined as the tone mapping curve. In general, a PQ curve is a curve in which a code value (x) and a luminance value (y) (which may also be referred to as a luminance value) correspond to each other one by one, and the maximum luminance is 10000nits. Typically HDR signals are 10 bits deep, that is to say code values in the range 0 to 1023. However, the PQ curve is clipped according to the maximum brightness value obtained in the embodiment of the present application, so that 1023 corresponds to different y values, and after the different y values are displayed through gamma correction, different contrasts exist on the LED display screen. That is, the method shown in the embodiment of the present application may readjust the PQ curve according to the relationship between the maximum content brightness level and the maximum frame average brightness.

Illustratively, adjusting the transmission curve corresponding to the display screen according to the relationship between the maximum content brightness level and the maximum frame average brightness level includes the following implementation manners:

in implementation mode 1, when the ratio of the maximum frame average brightness level to the maximum content brightness level is greater than the first ratio, the overall picture brightness of the image to be displayed is high, so that the maximum brightness value is determined according to the maximum brightness level and the first numerical value, and the PQ curve is intercepted according to the maximum brightness value.

Illustratively, the first ratio may be 2/3 and the first value may be 300.

For example, when the maximum frame average brightness level is greater than 2/3 of the maximum content brightness level, the video is considered to have high overall picture brightness, so that during curve adjustment, the brightness value 300nits higher than the maximum brightness level of the display screen is selected as the maximum brightness value, and the PQ curve is cut.

In implementation mode 2, when the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than or equal to the first ratio and larger than the second ratio, the overall picture brightness of the image to be displayed is relatively low, so that the maximum brightness value is determined according to the maximum brightness level and the second value, and the PQ curve is intercepted according to the maximum brightness value.

Illustratively, the first value is greater than the second value, e.g., the first ratio may be 2/3, the second ratio may be 1/3, and the second value may be 150.

For example, when the 1/3 maximum content brightness level < the maximum frame average brightness level <2/3 maximum content brightness level, the video is considered to have a high overall picture brightness, and therefore, in the curve adjustment, the maximum brightness value which is 150nits higher than the maximum brightness level of the display screen is selected, and the PQ curve is clipped.

In implementation mode 3, under the condition that the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than the second ratio, the overall picture brightness of the image to be displayed is normal, so that the maximum brightness value is determined according to the maximum brightness level, and the PQ curve is intercepted according to the maximum brightness value.

For example, when 0< maximum frame average brightness level <1/3 maximum content brightness level, the video is considered to have normal overall screen brightness, and therefore, during curve adjustment, the brightness value of the maximum brightness level of the display screen is selected to be the maximum brightness value, and the PQ curve is clipped.

In the embodiment of the application, the PQ curve is intercepted according to the maximum brightness value, so that the adjusted transmission curve can be obtained. In a possible implementation manner, the extracting the PQ curve according to the maximum brightness value, and obtaining the adjusted transmission curve includes: and intercepting the PQ curve according to the maximum brightness value, and adjusting the curve of the low-gray part of the PQ curve according to the low-gray brightness curve of the display screen to obtain an adjusted transmission curve.

For example, since the low-gray part of the PQ curve cannot be displayed on the LED display effectively, the curve of the low-gray part also needs to be adjusted according to the low-gray display performance of the LED display, and is usually corrected according to the low-gray brightness curve of the LED display.

In the embodiment of the present application, adjusting the color gamut mapping relationship corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the HDR signal source is as follows:

the color gamut mapping refers to mapping between color gamuts of the display device and the LED display device during video mastering, and the mapping has constancy, so that the mapping can be quickly realized by a table look-up method. The data in the lookup table is obtained in advance through a color gamut mapping algorithm, so that the mapping algorithm has the characteristics of simplicity and convenience in implementation, high efficiency and the like. The commonly used gamut space for HDR is DCI-P3 or bt.2020, which is generally larger than the gamut space of LED display screens, so that gamut compression mapping is required: the color gamut boundary of the LED display screen is obtained through the controller, XYZ values of the master color gamut space are converted into X ' Y ' Z ' values and then converted into normalized RGB values, the RGB values are proportionally compressed according to different proportions and distances of the color gamut space, the RGB values are firstly converted into a new set of RGB values, and then the new set of RGB values are converted into XYZ and XYZ values, so that the color gamut mapping is completed. And after the key points in the primary color domain are subjected to color gamut compression, generating a corresponding lookup table, and after the LED display screen enters the HDR PQ mode, selecting according to video metadata.

Generally, the maximum luminance value and the color gamut information of the display screen affect the effect of the image presented on the display screen. For example, the maximum luminance value determines the maximum luminance that can be displayed on the display screen, and if the display luminance of the image is greater than the maximum luminance value of the display screen, the luminance of the image cannot be accurately displayed, and the contrast of the image is affected and cannot be restored. The color gamut of the display screen determines the maximum color range that can be displayed by the display screen, and the colors of the image can be correctly restored when the image color gamut is consistent with the display color gamut. If the display color gamut is smaller than the mother color gamut, the displayed color saturation is lower than the color saturation of the picture to be displayed, if the display color gamut is larger than the shooting color gamut, the displayed color saturation is higher than the color saturation of the picture to be displayed, and the displayed color saturation is the same as the color saturation of the picture to be displayed only if the shooting color gamut is the same as the display color gamut. However, the method can ensure that the display screen has good adaptability to different images, and accurately restores the color, brightness and contrast of the images. And adjusting the PQ curve according to the metadata of the image to be displayed to obtain a target curve, so that the display screen can display the image to be displayed according to the target curve, and the gray scale and the contrast of the image to be displayed can be accurately restored.

Fig. 6a is a schematic diagram illustrating a variation of a PQ curve according to an embodiment of the present application. In the case illustrated in fig. 6a, the first ratio is 2/3, the second ratio is 1/3, the maximum content brightness level is 1000nits, the first value is 300, the first brightness value is 10nits, and the maximum brightness value may be 1300nits (i.e. 1000nits + 300nits) when the ratio of the maximum frame average brightness level to the maximum content brightness level is greater than 2/3. As shown in the curve CD, point C represents a point on the curve at a luminance value of 10nits, and point D represents a point on the curve at a luminance value of 1300nits. Typically, the processor transmits in a 10-bit transmission mode, for example, the image to be displayed may have a bit depth of 10 bits, and the corresponding encoded value ranges from 0 to 1023, and the luminance value corresponding to the encoded value 1023 is 1300nits. Optionally, for the part of the PQ curve with the brightness value less than or equal to 10nits, the display screen system may modify the part of the PQ curve with the brightness value less than or equal to 10nits, for example, adjust the brightness value of the part of the PQ curve with the brightness value less than or equal to 10nits to be greater than 10bit, or equal to 10nits. For example, the portion of the PQ curve with a brightness value less than 10nits may be adjusted to be a linear curve, for example, point a may start from the origin, or point a may start from 1 nit. It is understood that, regarding the description of the correction portion, fig. 6b and 6c shown below are equally applicable, and are not described below.

Referring to fig. 6b, fig. 6b is a schematic diagram illustrating another variation of PQ curve according to the embodiment of the present application. As shown in fig. 6b, when the first ratio is 2/3, the second ratio is 1/3, the second value is 150, the maximum content luminance level is 1000nits, the first luminance value is 10nits, and when the ratio of the maximum frame average luminance level to the maximum content luminance level is less than or equal to 2/3 and greater than 1/3, the maximum luminance value is 1150nits. As shown in the curve CD, where point C represents a point on the curve at a luminance value of 10nits and point D represents a point on the curve at a luminance value of 1150nits. In general, the processor transmits in a 10-bit transmission mode, if the image to be displayed has a bit depth of 10 bits, the range of the corresponding code value is 0 to 1023, and the luminance value corresponding to the code value 1023 is 1150nits.

Referring to fig. 6c, fig. 6c is a schematic diagram illustrating another variation of a PQ curve according to an embodiment of the present application. As shown in fig. 6c, when the first ratio is 2/3, the second ratio is 1/3, the maximum content brightness level is 1000nits, the first brightness value is 10nits, and when the ratio of the maximum frame average brightness level to the maximum content brightness level is less than 1/3, the maximum brightness value is 1000nits. As shown in curve CD, where point C represents a point on the curve at a luminance value of 10nits and point D represents a point on the curve at a luminance value of 1300nits. Generally, the processor transmits in a 10-bit transmission mode, if the image to be displayed has a bit depth of 10 bits, the corresponding encoded value ranges from 0 to 1023, and the luminance value corresponding to the encoded value 1023 is 1000nits.

The embodiment of the application is based on a PQ curve, a data processing method of a display screen system is realized, and an adjusted transmission curve is obtained by adjusting the PQ curve, so that a display screen displays an image to be displayed (such as a video source or an HDR video source) according to the adjusted transmission curve. The method provided by the embodiment of the application can ensure that the display screen can restore the color of the image to be displayed, improve the contrast and effectively improve the display effect of the display screen. In the embodiment of the application, the transmission curve of the LED display screen is adjusted according to the metadata, so that the HDR display effect of the LED display screen can be correctly restored under the optimal performance of the LED display screen, and the optimal watching effect of human eyes is ensured.

According to the embodiment of the application, the video transmission mode and the signal processing method can be automatically changed according to the type of the input video source, and the transmission curve of the display screen is adjusted according to the performance parameters of the display screen, so that the HDR display effect can be correctly restored by the display screen under the best performance of the display screen, and the best watching effect of human eyes is ensured. When the input signal is an HDR video source signal subjected to OETF encoding according to an HLG curve, in combination with the methods shown in fig. 4 and 5, the data processing method shown in the embodiment of the present application includes:

calibrating the gray level, the maximum luminous brightness and the color gamut of the display screen to obtain the performance parameters of the display screen; then, according to the identifier of the input signal, the display screen enters the HDR HLG mode, and since the HDR signal in the HLG format does not have metadata, the γ value of the transmission curve is determined by the highest brightness (e.g., the maximum brightness level of the display screen) of the display screen.

That is, in the case that the processor determines that the identifier of the image to be displayed is the hybrid log gamma HLG identifier, the controller adjusts the transmission curve corresponding to the display screen according to the performance parameters of the display screen and the ambient illumination. The performance parameters of the display screen comprise the maximum luminous brightness level of the display screen.

For example, the controller may determine a target parameter according to the maximum luminance level of the display screen and the ambient illuminance, determine the HLG curve according to the target parameter, and adjust a curve of a low gray portion of the HLG curve according to the low gray luminance curve of the display screen to obtain an adjusted transmission curve.

Generally, when the maximum brightness of the display screen is 1000nits, the gamma value is 1.2, 400nits, the gamma value is 1.03, when the gamma value is 2000nits, the gamma value is 1.33, the average brightness is automatically adjusted through the variable gamma, an illuminance sensor can be additionally arranged on the periphery of the display screen, the parameter of the ambient illuminance is introduced, the grading of the ambient illuminance is watched, the gamma value is finely adjusted to compensate the adaptive state of human eyes, in addition, the low-gray part of the HLG does not completely accord with the performance parameters of the display screen, so the low-gray part of the curve is modified again, the corresponding curve in the brightness value of 0 to 10nits is modified according to the low-gray brightness curve of the LED display screen, and the HLG curve is not simply applied. For example, the ambient illumination and the gamma value may have a positive correlation, and the gamma value may be larger when the gamma value is adjusted according to the larger the ambient illumination.

the color gamut mapping refers to mapping between color gamuts of the display device and the LED display device during video mastering, and the mapping has constancy, so that the mapping can be quickly realized by a table look-up method. The data in the lookup table is obtained in advance through a color gamut mapping algorithm, so that the mapping algorithm has the characteristics of simplicity and convenience in implementation, high efficiency and the like. The commonly used gamut space for HDR is DCI-P3 or bt.2020, which is generally larger than the gamut space of LED display screens, so that gamut compression mapping is required: the color gamut boundary of the LED display screen is obtained through the controller, XYZ values of the master color gamut space are converted into X ' Y ' Z ' values and then converted into normalized RGB values, the RGB values are compressed proportionally according to different proportions and distances of the color gamut space, the RGB values are converted into a new set of RGB values, and then the new set of RGB values are converted into XYZ and XYZ values, so that the color gamut mapping is completed. And after the key points in the primary color domain are subjected to color domain compression, generating a corresponding lookup table, and after the LED display screen enters the HDR PQ mode, selecting according to video metadata.

It is understood that reference may be made to the above embodiments with respect to the gamut space mapping method, which will not be described in detail herein.

According to the method and the device, the performance parameters of the display screen and the ambient illumination of the surrounding environment are obtained, the color gamut mapping relation and the tone mapping curve of the image to be displayed are adjusted, the color gamut mapping and the tone mapping are carried out on the image to be displayed, and the mapped image is output after being subjected to gamma correction. The LED display screen can correctly restore the HDR display effect under the best performance, and the best watching effect of human eyes is ensured. Generally, for an image to be displayed based on an HLG, the gamma value of an HLG curve is adjusted according to the maximum brightness value of a display screen, the color of the image to be displayed is correctly restored through color gamut mapping, and the HLG curve is corrected by introducing ambient illumination through a mode of adding a sensor. Since correct display of the low gray portion is an important prerequisite for optimal display of contrast and gray scale in the HDR mode, the present application corrects the HLG curve of the low gray portion.

Due to the diversity of the display screen system and the surrounding environment, the HLG curve shown in fig. 7a can be modified in many ways, and next, the HLG curve transformed from fig. 7a will be described with reference to fig. 7a, specifically referring to fig. 7b to fig. 7c.

Referring to fig. 7b, fig. 7b is a comparison graph of HLG curves under different ambient illumination levels according to the embodiment of the present application. As shown in fig. 7b, when the maximum brightness level of the display screen is 1000nits, the target parameter increases with the increase of the ambient illuminance when the ambient illuminance is 10nits,100nits, or 500nits, respectively. Optionally, for the part of the HLG curve with the luminance value less than or equal to 10nits, the display screen system may modify the part of the HLG curve, such as adjusting the luminance value of the part with the luminance value less than or equal to 10nits to be greater than 10bit, or equal to 10nits. Fig. 7c shows an example of the target curve with a maximum brightness level of 1000nits and an ambient illumination level of 10nits. For example, the portion of the target curve with a luminance value less than 10nits may be adjusted to a linear curve, e.g., point a may start from the origin, or point a may start from 1nit, etc. It is understood that, regarding the description of the correction portion, reference may be made to fig. 6a to 6c above, which are not repeated herein. Illustratively, for the above-mentioned portion of the HLG curve with luminance value less than or equal to 10nits, if the code value is 1, the luminance value is 11nits, the code value is 2, the luminance value is 22nits, and so on, as shown by the curve AB.

The embodiment of the application is based on the HLG curve, the data processing method of the display screen system is realized, and the color, the gray level and the contrast of the image to be displayed are restored by adjusting the target parameters of the HLG curve and adjusting the corresponding relation between the coding value and the brightness value.

Generally, when playing HDR video in HLG format, the γ value of the HLG curve is usually adjusted only according to the maximum brightness value of the display screen. However, in the embodiment of the present application, by adding a sensor, an environment is introduced, colors created by a video can be correctly restored through color gamut mapping, and meanwhile, a parameter of contrast of a display screen can be ensured by performing reasonable transmission curve correction, and a gamma value is corrected again, and meanwhile, correct display of a low gray portion is an important premise for optimal display of contrast and gray scale in an HDR mode, and correction of the low gray portion can enable an HLG HDR video playing effect to be optimal.

In an embodiment of the present application, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the data processing method provided by the foregoing embodiment.

The present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the data processing method provided by the foregoing embodiments.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data processing method of a display screen system, wherein the display screen system comprises a processor, a controller and a display screen, the method comprising:

identifying an image to be displayed through the processor, judging an identifier after identifying that the image to be displayed is a High Dynamic Range (HDR) image, and sending the image to be displayed to the controller;

adjusting a transmission curve and a color gamut mapping relation corresponding to the display screen according to the performance parameters of the display screen, and sending the image to be displayed to the display screen;

the display screen displays the image to be displayed according to the adjusted transmission curve and the color gamut mapping relation;

wherein, the adjusting the transmission curve corresponding to the display screen according to the performance parameter of the display screen comprises:

when the ratio of the maximum frame average brightness level to the maximum content brightness level is larger than a first ratio, determining a maximum brightness value according to the maximum brightness level and a first numerical value, and intercepting a transmission curve according to the maximum brightness value to obtain an adjusted transmission curve; or when the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than or equal to a first ratio and larger than a second ratio, determining a maximum brightness value according to the maximum brightness level and a second value, and intercepting a transmission curve according to the maximum brightness value to obtain an adjusted transmission curve; or when the ratio of the maximum frame average brightness level to the maximum content brightness level is smaller than a second ratio, determining a maximum brightness value according to the maximum brightness level, and intercepting a transmission curve according to the maximum brightness value to obtain an adjusted transmission curve.

2. The method of claim 1, wherein sending the image to be displayed to the controller comprises:

under the condition that the processor judges that the identifier of the image to be displayed is a PQ identifier, sending the image to be displayed and metadata of the image to be displayed to the controller;

the controller adjusting the transmission curve corresponding to the display screen according to the performance parameter of the display screen comprises:

and adjusting the transmission curve corresponding to the display screen according to the metadata of the image to be displayed and the performance parameters of the display screen.

3. The method of claim 2, wherein the metadata of the image to be displayed comprises: the display screen comprises a maximum frame average brightness level and/or a maximum content brightness level, and the performance parameters of the display screen comprise a maximum light-emitting brightness level.

4. The method of claim 3, wherein the transmission curve comprises a PQ curve.

5. The method of claim 4, wherein truncating the PQ curve according to the maximum brightness value and obtaining an adjusted transmission curve comprises:

and intercepting the PQ curve according to the maximum brightness value, and adjusting the curve of the low-gray part of the PQ curve according to the low-gray brightness curve of the display screen to obtain an adjusted transmission curve.

6. The method of claim 1, wherein the controller adjusting the transmission curve corresponding to the display screen according to the performance parameter of the display screen comprises:

and under the condition that the processor judges that the identifier of the image to be displayed is the mixed logarithm gamma HLG identifier, adjusting a transmission curve corresponding to the display screen according to the performance parameters of the display screen and the ambient illumination.

7. The method of claim 6, wherein the adjusting the transmission curve corresponding to the display screen according to the performance parameter of the display screen and the ambient illumination comprises:

determining a target parameter according to the maximum brightness level of the display screen and the ambient illumination, determining an HLG curve according to the target parameter, and adjusting the curve of the low-gray part of the HLG curve according to the low-gray brightness curve of the display screen to obtain an adjusted transmission curve.

8. The method according to any one of claims 1-7, wherein the controller adjusting the gamut mapping relationship corresponding to the display screen according to the performance parameter of the display screen comprises:

and adjusting the color gamut mapping relation corresponding to the display screen according to the color gamut space of the display screen and the color gamut space of the image to be displayed.

9. The method according to any one of claims 1-7, wherein the sending the image to be displayed to the controller comprises:

and the processor starts an HDR mode and sends the image to be displayed to the controller through a transmission mode of a target numerical value.

10. The method of claim 8, wherein sending the image to be displayed to the controller comprises:

11. A display screen system is characterized by comprising a processor, a controller and a display screen;

the processor is used for identifying an image to be displayed, judging an identifier after identifying that the image to be displayed is a high dynamic range HDR image, and sending the image to be displayed to the controller;

the controller is used for adjusting the mapping relation between the transmission curve and the color gamut corresponding to the display screen according to the performance parameters of the display screen and sending the image to be displayed to the display screen;

and the display screen is used for displaying the image to be displayed according to the adjusted transmission curve and the color gamut mapping relation.