CN114566131B - Display brightness control method and device and display lookup table acquisition method and device - Google Patents
Display brightness control method and device and display lookup table acquisition method and device Download PDFInfo
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Abstract
The disclosure relates to the field of display, and in particular, to a display brightness control method and device, and a display lookup table acquisition method and device. The display brightness control method comprises the following steps: acquiring an initial display lookup table of display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales; taking different HDR modes of the display device as current HDR modes respectively, and collecting first display brightness corresponding to each output gray scale in the current HDR modes; updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode; in a display stage, a corresponding target display lookup table is determined according to the current HDR mode of the display equipment, and the display brightness of the display equipment is controlled according to the target display lookup table.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display luminance control method, a display luminance control device, a display lookup table acquisition method, a display lookup table acquisition device, a nonvolatile computer readable storage medium, and an electronic apparatus.
Background
Currently, terminals such as professional monitors, computers, smartphones, etc. are widely used, and these terminals generally include a display device or a main body is the display device. Display devices typically have Gamma (Gamma) characteristics; the gamma characteristic affects the display effect of the image.
The existence of gamma characteristics is related to the characteristics of luminescent materials of the display device and cannot be independently adjusted; therefore, when the display device displays an image, the display brightness of the display device needs to be controlled in a targeted manner, so as to eliminate the influence of the gamma characteristic on the display effect as much as possible, and achieve the purpose of accurately reducing the brightness of the picture.
However, the existing display brightness control method has a place to be optimized in the aspects of adaptability and the like.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides a display luminance control method and apparatus, a display lookup table acquisition method and apparatus, a nonvolatile computer-readable storage medium, and an electronic device, so as to improve the adaptability of a display luminance control manner to different HDR modes at least to some extent.
According to one aspect of the present disclosure, there is provided a display brightness control method including:
acquiring an initial display lookup table of display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales;
taking different HDR modes of the display device as current HDR modes respectively, and collecting first display brightness corresponding to each output gray scale in the current HDR modes;
updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode;
in a display stage, a corresponding target display lookup table is determined according to the current HDR mode of the display equipment, and the display brightness of the display equipment is controlled according to the target display lookup table.
In an exemplary embodiment of the present disclosure, the obtaining an initial display lookup table of a display device includes:
selecting a plurality of reference gray scales from the plurality of target gray scales;
determining output gray scales corresponding to the reference gray scales;
and interpolating to calculate the output gray scale of the target gray scale between the adjacent reference gray scales according to the adjacent reference gray scales and the corresponding output gray scales.
In an exemplary embodiment of the disclosure, the determining the output gray level corresponding to each of the reference gray levels includes:
collecting second display brightness of the display equipment under each output gray scale;
calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale and the maximum display brightness of the display equipment;
and calculating the output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display equipment.
In an exemplary embodiment of the present disclosure, the updating the output gray level corresponding to the target gray level in the initial display lookup table includes:
selecting a first display brightness closest to the standard brightness of the reference gray scale from the display brightness as a reference display brightness, and updating the output gray scale of the reference gray scale map into the output gray scale corresponding to the reference display brightness;
and according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
In an exemplary embodiment of the present disclosure, the updating the output gray level corresponding to the target gray level in the initial display lookup table includes:
selecting the display brightness closest to the standard brightness of the target gray scale from the first display brightness as the target display brightness;
updating the output gray scale of the target gray scale map to the output gray scale corresponding to the target display brightness.
In an exemplary embodiment of the present disclosure, the method further comprises:
in a display stage, collecting third display brightness of the display equipment under each output gray scale;
and updating the output gray scale corresponding to the target gray scale in the target display lookup table according to the standard brightness of the target gray scale and the third display brightness corresponding to each output gray scale.
In an exemplary embodiment of the present disclosure, the updating the output gray level corresponding to the target gray level in the target display lookup table includes:
selecting the display brightness closest to the standard brightness of the reference gray scale from the third display brightness as the reference display brightness, and updating the output gray scale of the reference gray scale map into the output gray scale corresponding to the reference display brightness;
And according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
In an exemplary embodiment of the present disclosure, the updating the output gray level corresponding to the target gray level in the target display lookup table includes:
selecting the display brightness closest to the standard brightness of the target gray scale from the third display brightness as the target display brightness;
updating the output gray scale of the target gray scale map to the output gray scale corresponding to the target display brightness.
According to one aspect of the present disclosure, there is provided a display look-up table acquisition method including:
acquiring an initial display lookup table of display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales;
taking different HDR modes of the display device as current HDR modes respectively, and collecting first display brightness corresponding to each output gray scale in the current HDR modes;
and updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode.
According to one aspect of the present disclosure, there is provided a display brightness control apparatus including:
the first lookup table acquisition module is used for acquiring an initial display lookup table of the display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales;
the brightness acquisition module is used for taking different HDR modes of the display equipment as current HDR modes respectively and acquiring first display brightness corresponding to each output gray scale in the current HDR modes;
the second lookup table acquisition module is used for updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode;
and the display control module is used for determining a corresponding target display lookup table according to the current HDR mode of the display equipment in the display stage and controlling the display brightness of the display equipment according to the target display lookup table.
According to an aspect of the present disclosure, there is provided a display look-up table acquiring apparatus including:
the first lookup table acquisition module is used for acquiring an initial display lookup table of the display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales;
The brightness acquisition module is used for taking different HDR modes of the display equipment as current HDR modes respectively and acquiring first display brightness corresponding to each output gray scale in the current HDR modes;
and the second lookup table acquisition module is used for updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode.
According to one aspect of the present disclosure, there is provided an electronic device including: a processor; and a memory for storing one or more programs that, when executed by the processor, cause the processor to implement the methods as provided by aspects of the present disclosure.
According to one aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method as provided by some aspects of the present disclosure.
Exemplary embodiments of the present disclosure may have some or all of the following advantages:
according to the display brightness control method provided by the exemplary embodiment of the disclosure, firstly, the initial display lookup table of the display device is obtained, secondly, display brightness collection is performed under different HDR modes of the display device, and the target display lookup tables under the HDR modes are generated by combining the initial display lookup table, so that the corresponding target display lookup table can be determined according to the current HDR mode of the display device in a display stage, display brightness of the display device is controlled more accurately according to the target display lookup table, and the aim of accurately restoring picture brightness is achieved. On the one hand, the display brightness control method provided in the exemplary embodiment of the present disclosure can be better adapted to different HDR modes, so that the display device has a better display effect in different HDR modes; on the other hand, the display brightness control method provided by the exemplary embodiment of the disclosure does not need an external signal source or manual intervention, so that the burden of display equipment product research personnel and factory personnel is reduced, the research and development and testing efficiency of the display equipment is improved, and the product reject ratio is effectively reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1a to 1e are schematic views showing a gamma correction process in the related art.
Fig. 2 is a schematic diagram of a hardware system architecture to which the display brightness control method according to the embodiment of the present disclosure is applied
Fig. 3 is a schematic flow chart of a display brightness control method according to an embodiment of the disclosure.
Fig. 4 is a flow chart illustrating a method for obtaining an initial display lookup table in an embodiment of the present disclosure.
Fig. 5 is a flowchart illustrating a process of determining an output gray level corresponding to a reference gray level in an embodiment of the disclosure.
Fig. 6 is a schematic flow chart of a display brightness control method according to an embodiment of the disclosure.
Fig. 7 is a flow chart illustrating a method for obtaining a lookup table according to an embodiment of the disclosure.
Fig. 8 is a schematic diagram of a module of a display brightness control device according to an embodiment of the disclosure.
Fig. 9 is a schematic diagram of a module of a look-up table acquiring apparatus according to an embodiment of the present disclosure.
Fig. 10 shows a schematic structural diagram of a computer system for implementing an electronic device of an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor devices and/or microcontroller devices.
In the present disclosure, the terms "comprising," "including," "having," "disposed in" and "having" are intended to be open-ended and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.
In the related art, in order to eliminate the influence of the gamma characteristic on the display effect as much as possible, the display brightness of the display device is controlled by a gamma correction curve. For example, referring to fig. 1a, a mapping relationship curve (hereinafter referred to as an input signal gamma curve) between a natural scene light signal corresponding to an image and an actually stored data signal is shown; the curve is specificallyWherein, gamma 1 Less than 1. Referring to fig. 1b, a mapping relationship curve between display brightness and intensity of a driving signal (e.g. T-con) of a display device (hereinafter referred to as a display device gamma curve); the curve is specifically +.>Wherein, gamma 2 Greater than 1, is associated with the luminescent material characteristics of the display device, for example typically 2.2. Referring to FIG. 1c, three gamma correction curves s are shown 1 、s 2 Sum s 3 . By gamma correction curve s 1 For example, it is in particular +.>γ 3 Greater than 1; gamma correction curve s 1 After superposition with the gamma curve of the display device shown in FIG. 1b, the curve s in FIG. 1d is obtained 4 The method comprises the steps of carrying out a first treatment on the surface of the Referring to FIG. 1e, curve s in FIG. 1d 4 After being superimposed with the gamma curve of the input signal shown in FIG. 1a, a curve s between the natural scene light signal and the display brightness of the display device can be obtained 7 The method comprises the steps of carrying out a first treatment on the surface of the In curve s 7 The natural scene light signal is linearly consistent with the display brightness of the display device, namely the influence of gamma characteristics on the display effect is eliminated.
Currently, more and more display devices support HDR (High Dynamic Range Imaging ) technology. Typically, these display devices have multiple HDR modes, and in different HDR modes, gamma correction curves can existDifferent from each other. For example, with continued reference to FIG. 1c, in a certain HDR mode, the gamma correction curve s 2 May beγ 3 Equal to 1; gamma correction curve s 2 After superposition with the gamma curve of the display device shown in FIG. 1b, the curve s in FIG. 1d is obtained 5 The method comprises the steps of carrying out a first treatment on the surface of the Referring to FIG. 1e, curve s in FIG. 1d 5 After superposition with the gamma curve of the input signal shown in FIG. 1a, a specific curve s is obtained 7 Slightly depressed display effect curve s 8 . Similarly, in a certain HDR mode, the gamma correction curve s 3 Can be +.>γ 3 If the ratio is less than 1, a specific curve s is finally obtained 8 Lower display effect curve s 9 . That is, even if the same image data is input, different display effects may be obtained depending on the HDR mode. In addition, as the time of use of the display device passes, the characteristics of the light emitting material of the display device may change (e.g., age, etc.), and thus the effect of the display device may be affected.
However, the display brightness control method in the related art may not be widely applicable to the above-described various cases. In order to improve this problem at least to some extent, a display luminance control method is provided in the present exemplary embodiment.
Fig. 2 is a schematic diagram of a hardware system architecture to which the display brightness control method according to the embodiment of the present disclosure may be applied. In the hardware system rack, a display device 210, an image output module 220, a brightness acquisition module 230, and a main control module 240 may be included. Wherein:
the display device 240 may be, for example, a professional monitor; but also a display screen of a terminal such as a computer, a smart phone, a television set, etc. The image output module 220 may be a module having an image data output function, such as an FPGA (Field Programmable Gate Array ) or a GPU (Graphics Processing Unit, graphics processor). The luminance acquisition module 230 may be, for example, a colorimeter or an optical sensor or the like capable of acquiring the display luminance of the display device. The main control module 240 may be a module having an arithmetic processing function, such as a SoC (System on Chip) or a MCU (Microcontroller Unit, microprocessor).
In this example embodiment, the target image may be parsed and converted to gray-scale data by the image output module 220, and the gray-scale data may be input to the display device 210. The display device 210 may control the display brightness of each sub-pixel according to the gray-scale data to display a picture corresponding to the target image. The brightness acquisition module 230 may acquire the display brightness of the display panel 210, and feed back to the main control module 240. The main control module 240 may combine the display brightness of the display panel 210, obtain a target display lookup table according to the display brightness control method described below in the disclosure, and transmit the target display lookup table to the image output module 220. Furthermore, the image output module 220 can adjust the gray-scale data input to the display device 210 according to the target display lookup table, so as to control the display brightness of the display device and achieve the purpose of accurately restoring the brightness of the picture.
As shown in fig. 3, the display brightness control method provided in the present exemplary embodiment may include the following steps S310 to S350. Wherein:
step S310, an initial display lookup table of the display device is obtained, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales.
Step S320, respectively taking different HDR modes of the display device as current HDR modes, and collecting first display luminances corresponding to each output gray scale in the current HDR modes.
Step S330, updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale, so as to obtain a target display lookup table of the current HDR mode.
Step S340, in the display stage, determining a corresponding target display lookup table according to the current HDR mode of the display device, and controlling the display brightness of the display device according to the target display lookup table.
According to the display brightness control method provided by the exemplary embodiment of the disclosure, firstly, the initial display lookup table of the display device is obtained, secondly, display brightness collection is performed under different HDR modes of the display device, and the target display lookup tables under the HDR modes are generated by combining the initial display lookup table, so that the corresponding target display lookup table can be determined according to the current HDR mode of the display device in a display stage, display brightness of the display device is controlled more accurately according to the target display lookup table, and the aim of accurately restoring picture brightness is achieved. On the one hand, the display brightness control method provided in the exemplary embodiment of the present disclosure can be better adapted to different HDR modes, so that the display device has a better display effect in different HDR modes; on the other hand, the display brightness control method provided by the exemplary embodiment of the disclosure does not need an external signal source or manual intervention, so that the burden of display equipment product research personnel and factory personnel is reduced, the research and development and testing efficiency of the display equipment is improved, and the product reject ratio is effectively reduced.
Next, each step of the display luminance control method in the present exemplary embodiment will be described in more detail with reference to the drawings and embodiments.
In step S310, an initial display lookup table of the display device is obtained, where the initial display lookup table includes a mapping relationship between a target gray level and an output gray level.
In this example embodiment, the target gray level is a gray level to be presented, for example, a gray level of a subpixel of an image to be displayed; the output gray scale is the gray scale applied when the display panel performs actual display. In order to reduce the amount of computation in image display, the gray scale actually required to be output may be determined by referring to a display look-up table (LUT) in this exemplary embodiment. For example, if the display look-up table is recorded (61,75), the display device needs to output a driving signal corresponding to 75 gray scales to display 61 gray scales. The display look-up table records (211,225), and the display device needs to output a driving signal corresponding to 225 gray scales to display 211 gray scales. Referring to fig. 4, in the present exemplary embodiment, an initial display lookup table of a display device may be acquired through steps S410 to S430 described below. Wherein:
Step S410, selecting a plurality of reference gray levels from the plurality of target gray levels.
Taking a display device with a color accuracy of 10 bits as an example, the target gray scale has 1024 levels, i.e., gray scales 0 to 1023. In order to ensure correction accuracy as much as possible, the output gray scale corresponding to each target gray scale can be determined one by one; in order to reduce the operation amount, the output gray levels corresponding to the reference gray levels may be determined first, and then the output gray levels of the target gray levels between the reference gray levels may be determined by means of interpolation operation. The second mode will be exemplified in the present exemplary embodiment.
For example, in the present exemplary embodiment, 65 gray scales may be selected from the 1024 gray scales as the reference gray scales; for example, gray scales 0, 15, 31, 63 …, 1023 may be selected as reference gray scales, that is, 65 reference gray scales may be uniformly selected at intervals of 16 gray scales. In addition, considering the sensitivity of human eyes to the details of dark areas of the picture, in some exemplary embodiments, the number of interval gray levels for selecting the reference gray level may be gradually increased as the target gray level increases; for example, gray levels 0, 3, 7, 15, 23, 31, 63 … 1023 may be selected as reference gray levels. This is not particularly limited in the present exemplary embodiment.
Step S420, determining an output gray level corresponding to each reference gray level.
Referring to fig. 5, in the present exemplary embodiment, the output gray scale corresponding to each of the reference gray scales may be determined through the following steps S510 to S530. Wherein:
step S510, collecting a second display brightness of the display device under each output gray scale.
The D65 color temperature is a common color temperature of various industries to simulate the outdoor sunlight in the daytime, so the D65 color temperature is generally used as a standard color temperature. In the present exemplary embodiment, the display device is first adjusted to the D65 color temperature; further, at the D65 color temperature, the second display luminance of the display device at each output gray level, that is, the display luminance of the display device at the output gray levels of 0, 1, 2, 3, 4 … 1023 is acquired by a colorimeter or an optical sensor, respectively. However, according to practical requirements, the display brightness may be acquired at other color temperatures, such as D50, which is not particularly limited in the present exemplary embodiment.
In addition, in some exemplary embodiments of the present disclosure, in order to more accurately determine the display brightness at each output gray level, the display brightness of the display device may also be acquired multiple times at the same output gray level. Furthermore, the average value of the multiple acquisition results can be used as the display brightness under the output gray scale; or, taking the median value of the multiple acquisition results as the display brightness and the like under the output gray scale; this is also within the scope of the present disclosure.
Step S520, calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale, and the maximum display brightness of the display device.
For example, for an arbitrary reference gray level m i If the corresponding original GAMMA correction value is recorded as GAMMA, the reference gray level m is calculated i Corresponding second display brightness L v Maximum display brightness L with the display device w (display luminance corresponding to the above gray level 1023) is normalized to L v /L w The reference gray level m 1 Normalized with the maximum output gray level (e.g. 1023) to be E', the reference gray level m i The original gamma correction value of (a) is:
step S530, calculating an output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display device.
For example, the maximum display brightness and the maximum display brightness of the display device may be combined firstReference gray scale m i Calculating reference gray scale m according to standard brightness calculation formula of (2) i Standard luminance value L i The method comprises the steps of carrying out a first treatment on the surface of the Next, reference gray level m i Standard luminance value L i Maximum display brightness L with the display device w (display luminance corresponding to the above gray level 1023) is normalized to L i /L w Then, the reference gray level m can be calculated i Corresponding output gray scale n i ：
In the above exemplary embodiment, a display device with a color precision of 10 bits is taken as an example, and the reference gray level m is calculated i Corresponding output gray scale n i When it is needed to multiply by 2 10 The method comprises the steps of carrying out a first treatment on the surface of the In other color-accurate display devices, other conversions may be performed accordingly.
Step S430, calculating the output gray scale of the target gray scale between the adjacent reference gray scales by interpolation according to the adjacent reference gray scales and the corresponding output gray scales.
For example, in the present exemplary embodiment, the output gray level of the target gray level between the adjacent reference gray levels may be calculated by using a linear interpolation method. For example, for adjacent reference gray levels m i And m i+1 Target gray level m in between j The target gray level m can be determined first j Standard luminance L of (2) j Then, a target gray level m is calculated according to the following formula j Corresponding output gray scale n j ：
Wherein n is i For reference gray scale m i Corresponding output gray scale; n is n i+1 For reference gray scale m i+1 Corresponding output gray scale; i is greater than 0.
Of course, in other exemplary embodiments of the present disclosure, the output gray level of the target gray level between the adjacent reference gray levels may also be calculated by other manners, such as nonlinear interpolation, which is not particularly limited in the present exemplary embodiment.
As previously described, in different HDR modes, the gamma correction curves for the display device may be different. In addition, in different HDR modes, the definition of maximum brightness of the display device may also be different; for example, the maximum luminance in HLG 1.2 mode is 1000nit and the maximum luminance in HLG 1.11 mode is 600nit. Table 1 below shows the relationship between several HDR modes and the display brightness of the display device:
table 1 HDR mode and display luminance relationship table
As can be seen from the above step S530, the maximum display brightness of the display device is different, and the mapping relationship between the target gray level and the output gray level is correspondingly different. Therefore, in the present exemplary embodiment, the display luminance of the display device is also controlled according to the different HDR mode adaptations by the following steps. Wherein:
in step S320, the different HDR modes of the display device are respectively used as the current HDR mode, and the first display brightness corresponding to each output gray scale in the current HDR mode is collected.
Taking the example that the current HDR mode is the HLG 1.2 mode and the maximum brightness in the HLG 1.2 mode is 1000nit, the PWM (Pulse Width Modulation ) driving signal of the backlight module of the display device needs to be adjusted at the D65 color temperature first, so that the brightness of the display device reaches 1000nit through the adjustment of the backlight brightness of the display device. Next, the second display luminance of the display device at each output gray level, that is, the display luminance of the display device at the output gray levels of 0, 1, 2, 3, 4 … 1023 is acquired by a colorimeter or an optical sensor, respectively. However, according to practical requirements, the display brightness may be acquired at other color temperatures, such as D50, which is not particularly limited in the present exemplary embodiment.
In addition, in some exemplary embodiments of the present disclosure, in order to more accurately determine the display brightness at each output gray level, the display brightness of the display device may also be acquired multiple times at the same output gray level. Furthermore, the average value of the multiple acquisition results can be used as the display brightness under the output gray scale; or, taking the median value of the multiple acquisition results as the display brightness and the like under the output gray scale; this is also within the scope of the present disclosure.
When the current HDR mode is other HDR modes, the maximum display brightness of the display device may be adjusted in a similar manner, and then the first display brightness corresponding to each output gray scale in the current HDR mode is collected.
In step S330, the output gray scale corresponding to the target gray scale in the initial display lookup table is updated according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale, so as to obtain a target display lookup table of the current HDR mode.
In this example embodiment, the output gray-scale corresponding to the target gray-scale in the initial display lookup table may be updated by:
first, selecting a first display brightness closest to the standard brightness of the reference gray scale from the display brightness as a reference display brightness, and updating the output gray scale of the reference gray scale map to the output gray scale corresponding to the reference display brightness.
For example, for an arbitrary reference gray level m i The reference gray level m can be redetermined according to the maximum brightness in the current HDR mode and the standard brightness calculation formula i Standard luminance L of (2) i . Further, the standard luminance L may be determined from 1024 first display luminances acquired in the above step S320 i Nearest first display brightness L' i As a reference, the brightness is displayed. Then, the reference gray level m can be obtained i The mapped output gray scale is updated to the first display brightness L' i And outputting the corresponding gray scale. For example, in the initial display look-up table, reference is made to the gray level m i The corresponding output gray level is n i First display brightness L' i The corresponding output gray level is n' i The reference gray level m in the initial display lookup table is displayed i The corresponding output gray scale is represented by n i Updated to n' i 。
And secondly, according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
For example, in the present exemplary embodiment, the output gray level of the target gray level between the adjacent reference gray levels may be calculated by using a linear interpolation method. For example, for adjacent reference gray levels m i And m i+1 Target gray level m in between j The target gray level m can be first redetermined j Standard luminance L of (2) j Then, a target gray level m is calculated according to the following formula j Corresponding updated output gray scale n' j ：
Wherein n' i For reference gray scale m i Corresponding updated output gray scale; n's' i+1 For reference gray scale m i+1 Corresponding updated output gray scale; i is greater than 0.
Of course, in other exemplary embodiments of the present disclosure, the output gray level of the target gray level between the adjacent reference gray levels may also be calculated by other manners, such as nonlinear interpolation, which is not particularly limited in the present exemplary embodiment.
In addition, in some exemplary embodiments of the present disclosure, the output gray-scale corresponding to the target gray-scale in the initial display lookup table may also be updated in other manners. For example, the display luminance closest to the standard luminance of the target gray scale may be selected directly from the first display luminances as the target display luminance; further, the output gray scale of the target gray scale map may be updated to the output gray scale corresponding to the target display luminance.
For example, for any target gray level m j The target gray scales m can be redetermined according to the maximum brightness in the current HDR mode and the standard brightness calculation formula j Standard luminance L of (2) j . Further, the standard luminance L is determined among 1024 first display luminances acquired in the above step S320 j Nearest first display brightness L' j The brightness is displayed as a target. Then, the target gray level m can be obtained j The mapped output gray scale is updated to the first display brightness L' j And outputting the corresponding gray scale. For example, in the initial display look-up table, the target gray level m j The corresponding output gray level is n j First display brightness L' j The corresponding output gray level is n' j Then the target gray level m in the lookup table is initially displayed j The corresponding output gray scale is represented by n j Updated to n' j 。
After the output gray scales corresponding to all the target gray scales in the initial display lookup table are updated, the target display lookup table of the current HDR mode can be obtained. Similarly, a target display look-up table corresponding to each other HDR mode may be obtained.
In step S340, in the display phase, a corresponding target display lookup table is determined according to the current HDR mode of the display device, and the display brightness of the display device is controlled according to the target display lookup table.
In this example embodiment, when the display device actually displays, the current HDR mode of the display device may be obtained by the main control module 240, and then, in the target display lookup table stored in advance, the target display lookup table corresponding to the current HDR mode may be obtained. After the target display lookup table is obtained, the target display lookup table may be transmitted to the image output module 220, so that the image output module 220 adjusts the gray-scale data input to the display device 210 according to the target display lookup table, thereby realizing control of the display brightness of the display device and achieving the purpose of accurately restoring the picture brightness.
In addition, as the time of use of the display device passes, the characteristics of the light emitting material of the display device may change (e.g., age, etc.), and thus the effect of the display device may be affected. Thus, in the present exemplary embodiment, the target display lookup table may also be updated again in the display stage. For example, referring to fig. 6, the display brightness control method in the present exemplary embodiment may further include the following step S350 and step S360. Wherein:
step S350, in the display stage, collecting the third display brightness of the display device under each output gray scale. The specific implementation of this step is similar to the above-mentioned step S510 or step S320, and thus a detailed description thereof will not be repeated here.
Step S360, updating the output gray scale corresponding to the target gray scale in the target display query table according to the standard brightness of the target gray scale and the third display brightness corresponding to each output gray scale.
In this example embodiment, the output gray-scale corresponding to the target gray-scale in the target display lookup table may be updated by:
first, selecting the display brightness closest to the standard brightness of the reference gray scale from the third display brightness as the reference display brightness, and updating the output gray scale of the reference gray scale map to the output gray scale corresponding to the reference display brightness.
For example, for an arbitrary reference gray level m i The reference brightness L can be determined from 1024 third display brightness collected in the step S350 i Third nearest display brightness L' i As a reference, the brightness is displayed. Then, the reference gray level m can be obtained i The mapped output gray scale is updated to a third display brightness L' i And outputting the corresponding gray scale. For example, in the target display lookup table, reference is made to the gray level m i The corresponding output gray level is n' i Third display luminance L' i The corresponding output gray level is n' i The reference gray level m in the target display lookup table is displayed i The corresponding output gray scale is represented by n' i Updated to n' i 。
And secondly, according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
For example, in the present exemplary embodiment, the output gray level of the target gray level between the adjacent reference gray levels may be calculated by using a linear interpolation method. For example, for adjacent reference gray levels m i And m i+1 Target gray level m in between j The target gray level m may be calculated first according to the following formula j Corresponding updated output gray scale n' j ：
Wherein n' i For reference gray scale m i Corresponding updated output gray scale; n' i+1 For reference gray scale m i+1 Corresponding updated output gray scale; i is greater than 0.
In addition, in some exemplary embodiments of the present disclosure, the output gray-scale corresponding to the target gray-scale in the target display lookup table may also be updated in other manners. For example, the display luminance closest to the standard luminance of the target gray scale may be selected directly from the third display luminances as the target display luminance; further, the output gray scale of the target gray scale map may be updated to the output gray scale corresponding to the target display luminance.
For example, for any target gray level m j The standard brightness L can be determined directly from 1024 third display brightness collected in the step S350 j Third nearest display brightness L' j The brightness is displayed as a target. Then, the target gray level m can be obtained j The mapped output gray scale is updated to a third display brightness L' j And outputting the corresponding gray scale. For example, in the target display look-up table, the target gray level m j The corresponding output gray level is n' j First display brightness L' j The corresponding output gray level is n' j Then the target gray level m in the target display lookup table is displayed j The corresponding output gray scale is represented by n' j Updated to n' j 。
Further, referring to fig. 7, in this exemplary embodiment, a method for obtaining a display lookup table is also provided. The method may include steps S710 to S730 described below. Wherein:
Step S710, an initial display lookup table of the display device is obtained, wherein the initial display lookup table contains the mapping relation between the target gray scale and the output gray scale.
Step S720, respectively taking different HDR modes of the display device as current HDR modes, and collecting first display luminances corresponding to each output gray scale in the current HDR modes.
Step S730, updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale, so as to obtain a target display lookup table of the current HDR mode.
Through the steps S710 to S730, the target display lookup table corresponding to each HDR mode may be obtained, and then each target display lookup table may be stored in the display device in advance, so as to be convenient for subsequent direct call. The specific implementation of step S710 to step S730 is similar to that of step S310 to step S330 described above, and thus the description thereof will not be repeated here.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
Further, a display brightness control device is also provided in this exemplary embodiment. Referring to fig. 8, the display brightness control apparatus 800 may include a first lookup table acquisition module 810, a brightness acquisition module 820, a second lookup table acquisition module 830, and a display control module 840. Wherein:
the first lookup table obtaining module 810 may be configured to obtain an initial display lookup table of the display device, where the initial display lookup table includes a mapping relationship between a target gray level and an output gray level. The luminance acquisition module 820 may be configured to take different HDR modes of the display device as current HDR modes, and acquire first display luminances corresponding to each output gray scale in the current HDR mode. The second lookup table obtaining module 830 may be configured to update the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale, so as to obtain a target display lookup table in the current HDR mode. The display control module 840 may be configured to determine, during a display phase, a corresponding target display lookup table according to a current HDR mode of the display device, and control display brightness of the display device according to the target display lookup table.
Further, in this exemplary embodiment, a display look-up table obtaining apparatus is also provided. Referring to fig. 9, the lookup table obtaining apparatus 900 may include a first lookup table obtaining module 910, a brightness collecting module 920, and a second lookup table obtaining module 930. Wherein:
the first lookup table obtaining module 910 may be configured to obtain an initial display lookup table of the display device, where the initial display lookup table includes a mapping relationship between a target gray level and an output gray level. The luminance acquisition module 920 may be configured to take different HDR modes of the display device as current HDR modes, and acquire first display luminances corresponding to each output gray scale in the current HDR mode. The second lookup table obtaining module 930 may be configured to update the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale, so as to obtain a target display lookup table in the current HDR mode.
The specific details of each module and component in the display brightness control device and the display lookup table obtaining device are described in detail in the corresponding display brightness control method or display lookup table obtaining method, so that the details are not repeated here.
It should be noted that although in the above detailed description several modules or components of a device for action execution are mentioned, such partitioning is not mandatory. Indeed, the features and functions of two or more modules or components described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof.
In an exemplary embodiment of the present disclosure, there is also provided an electronic apparatus including: a processor; a memory configured to store processor-executable instructions; wherein the processor is configured to perform the method of any of the present example embodiments.
Fig. 10 shows a schematic structural diagram of a computer system for implementing an electronic device of an embodiment of the present disclosure. It should be noted that, the computer system 1000 of the electronic device shown in fig. 10 is only an example, and should not impose any limitation on the functions and the application scope of the embodiments of the present disclosure.
As shown in fig. 10, the computer system 1000 includes a central processor 1001, which can perform various appropriate actions and processes according to a program stored in a read only memory 1002 or a program loaded from a storage section 1008 into a random access memory 1003. In the random access memory 1003, various programs and data necessary for the system operation are also stored. The central processor 1001, the read only memory 1002, and the random access memory 1003 are connected to each other by a bus 1004. An input/output interface 1005 is also connected to the bus 1004.
The following components are connected to the input/output interface 1005: an input section 1006 including a keyboard, a mouse, and the like; an output portion 1007 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage portion 1008 including a hard disk or the like; and a communication section 1009 including a network interface card such as a Local Area Network (LAN) card, a modem, or the like. The communication section 1009 performs communication processing via a network such as the internet. The drive 1010 is also connected to the input/output interface 1005 as needed. A removable medium 1011, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like, is installed as needed in the drive 1010, so that a computer program read out therefrom is installed as needed in the storage section 1008.
In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from a network via the communication portion 1009, and/or installed from the removable medium 1011. The computer programs, when executed by the central processor 1001, perform the various functions defined in the apparatus of the present application.
In an exemplary embodiment of the present disclosure, there is also provided a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a computer, performs the method of any of the above.
The non-volatile computer readable storage medium shown in the present disclosure may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, radio frequency, and the like, or any suitable combination of the foregoing.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (11)
1. A display brightness control method, characterized by comprising:
acquiring an initial display lookup table of display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales; the obtaining an initial display lookup table of the display device comprises selecting a plurality of reference gray scales from a plurality of target gray scales; collecting second display brightness of the display equipment under each output gray scale; calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale and the maximum display brightness of the display equipment; calculating an output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display equipment; interpolating to calculate the output gray scale of the target gray scale between the adjacent reference gray scales according to the adjacent reference gray scales and the corresponding output gray scales;
Taking different HDR modes of the display device as current HDR modes respectively, and collecting first display brightness corresponding to each output gray scale in the current HDR modes;
updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode;
in a display stage, a corresponding target display lookup table is determined according to the current HDR mode of the display equipment, and the display brightness of the display equipment is controlled according to the target display lookup table.
2. The method of claim 1, wherein updating the output gray-scale corresponding to the target gray-scale in the initial display lookup table comprises:
selecting a first display brightness closest to the standard brightness of the reference gray scale from the display brightness as a reference display brightness, and updating the output gray scale of the reference gray scale map into the output gray scale corresponding to the reference display brightness;
and according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
3. The method of claim 1, wherein updating the output gray-scale corresponding to the target gray-scale in the initial display lookup table comprises:
selecting the display brightness closest to the standard brightness of the target gray scale from the first display brightness as the target display brightness;
updating the output gray scale of the target gray scale map to the output gray scale corresponding to the target display brightness.
4. The display luminance control method according to claim 1, characterized in that the method further comprises:
in a display stage, collecting third display brightness of the display equipment under each output gray scale;
and updating the output gray scale corresponding to the target gray scale in the target display lookup table according to the standard brightness of the target gray scale and the third display brightness corresponding to each output gray scale.
5. The method of claim 4, wherein updating the output gray-scale corresponding to the target gray-scale in the target display lookup table comprises:
selecting the display brightness closest to the standard brightness of the reference gray scale from the third display brightness as the reference display brightness, and updating the output gray scale of the reference gray scale map into the output gray scale corresponding to the reference display brightness;
And according to the adjacent reference gray scales and the corresponding output gray scales, interpolating calculation is performed to update the output gray scales of the target gray scales between the adjacent reference gray scales.
6. The method of claim 4, wherein updating the output gray-scale corresponding to the target gray-scale in the target display lookup table comprises:
selecting the display brightness closest to the standard brightness of the target gray scale from the third display brightness as the target display brightness;
updating the output gray scale of the target gray scale map to the output gray scale corresponding to the target display brightness.
7. A method for obtaining a display lookup table, comprising:
acquiring an initial display lookup table of display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales; the obtaining an initial display lookup table of the display device comprises selecting a plurality of reference gray scales from a plurality of target gray scales; collecting second display brightness of the display equipment under each output gray scale; calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale and the maximum display brightness of the display equipment; calculating an output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display equipment; interpolating to calculate the output gray scale of the target gray scale between the adjacent reference gray scales according to the adjacent reference gray scales and the corresponding output gray scales;
Taking different HDR modes of the display device as current HDR modes respectively, and collecting first display brightness corresponding to each output gray scale in the current HDR modes;
and updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode.
8. A display luminance control apparatus, comprising:
the first lookup table acquisition module is used for acquiring an initial display lookup table of the display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales; the first lookup table acquisition module is further used for selecting a plurality of reference gray scales from a plurality of target gray scales; collecting second display brightness of the display equipment under each output gray scale; calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale and the maximum display brightness of the display equipment; calculating an output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display equipment; interpolating to calculate the output gray scale of the target gray scale between the adjacent reference gray scales according to the adjacent reference gray scales and the corresponding output gray scales;
The brightness acquisition module is used for taking different HDR modes of the display equipment as current HDR modes respectively and acquiring first display brightness corresponding to each output gray scale in the current HDR modes;
the second lookup table acquisition module is used for updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode;
and the display control module is used for determining a corresponding target display lookup table according to the current HDR mode of the display equipment in the display stage and controlling the display brightness of the display equipment according to the target display lookup table.
9. A display look-up table acquisition apparatus, comprising:
the first lookup table acquisition module is used for acquiring an initial display lookup table of the display equipment, wherein the initial display lookup table comprises a mapping relation between target gray scales and output gray scales; the first lookup table acquisition module is further used for selecting a plurality of reference gray scales from a plurality of target gray scales; collecting second display brightness of the display equipment under each output gray scale; calculating an original gamma value of the reference gray scale according to the reference gray scale, the maximum output gray scale, the second display brightness of the reference gray scale and the maximum display brightness of the display equipment; calculating an output gray scale corresponding to the reference gray scale according to the standard brightness of the reference gray scale, the original gamma value and the maximum display brightness of the display equipment; interpolating to calculate the output gray scale of the target gray scale between the adjacent reference gray scales according to the adjacent reference gray scales and the corresponding output gray scales;
The brightness acquisition module is used for taking different HDR modes of the display equipment as current HDR modes respectively and acquiring first display brightness corresponding to each output gray scale in the current HDR modes;
and the second lookup table acquisition module is used for updating the output gray scale corresponding to the target gray scale in the initial display lookup table according to the standard brightness of the target gray scale and the first display brightness corresponding to each output gray scale to obtain a target display lookup table of the current HDR mode.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the method of any of claims 1-7.
11. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the method of any of claims 1-7 via execution of the executable instructions.
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