CN109391855B - Method for determining display brightness value and set top box - Google Patents
Method for determining display brightness value and set top box Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/485—End-user interface for client configuration
- H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast
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Abstract
The invention discloses a method for determining a display brightness value and a set top box, and relates to the technical field of video processing. Wherein the determining party includes: the set top box acquires an extended display identifier of the television terminal; the set top box acquires the maximum display brightness value supported by the television terminal by using the extended display identifier; the set-top box maps the pixel brightness value in the high dynamic range to the pixel brightness value in the range less than or equal to the maximum display brightness value by using the maximum display brightness value. Therefore, the video experience of the television terminal is improved under the condition that the television terminal is not modified.
Description
Technical Field
The invention relates to the technical field of video processing, in particular to a method for determining a pixel display brightness value and a set top box.
Background
The rapid innovation of video technology has progressed from the resolution enhancement of the first stage to the omnidirectional enhancement of the second stage, which includes high resolution, high frame rate, high dynamic range, wide color gamut and high bit width. The most obvious improvement on the user video experience is the HDR (High-Dynamic Range) technology, and the larger the Dynamic Range is, the more scene details of the video display are, and the better the visual effect is.
However, since the high Dynamic Range needs to be supported by a new tv terminal supporting the HDR function, if the user uses a conventional SDR (Standard-Dynamic Range) tv terminal, the set-top box often maps (Tone mapping) the high Dynamic Range video to the Standard Dynamic Range (0-100nit), so that detailed information such as brightness and contrast of the high Dynamic Range video cannot be utilized, and the video experience is poor.
Disclosure of Invention
The invention solves the technical problem of how to improve the video experience of the television terminal in the aspect of brightness under the condition of not modifying the television terminal.
According to an aspect of an embodiment of the present invention, there is provided a method for determining a display luminance value, including: the set top box acquires an extended display identifier of the television terminal; the set top box acquires the maximum display brightness value supported by the television terminal by using the extended display identifier; the set-top box maps the pixel brightness value in the high dynamic range to the pixel brightness value in the range less than or equal to the maximum display brightness value by using the maximum display brightness value.
In one embodiment, the step of acquiring the extended display identifier of the television terminal by the set-top box comprises the following steps: the set-top box acquires the extended display identifier of the television terminal from the electrically erasable programmable read-only memory of the television terminal through the high-definition multimedia interface.
In one embodiment, the step of acquiring the maximum display brightness value supported by the television terminal by the set top box by using the extended display identifier comprises the following steps: the set-top box queries a pre-established database storing the corresponding relation between the vendor special data block and the maximum display brightness value supported by the television terminal by using the vendor special data block in the extended display identifier, and acquires the maximum display brightness value supported by the television terminal.
In one embodiment, the set top box mapping the luminance values of the pixels in the high dynamic range to be less than or equal to the luminance values of the pixels in the maximum display luminance value range using the maximum display luminance value comprises: the set top box maps the pixel brightness value in the high dynamic range into a normalized pixel brightness value by using the maximum display brightness value; the set-top box maps the normalized pixel brightness value to a pixel brightness value within a range less than or equal to the maximum display brightness value by using the maximum display brightness value.
In one embodiment, the set top box mapping pixel luminance values in the high dynamic range to normalized pixel luminance values using the maximum display luminance value comprises: the set-top box takes the maximum display brightness value as the base, and the logarithm of the pixel brightness value in the high dynamic range is solved; and the set top box maps the logarithm of the pixel brightness value in the high dynamic range into a normalized pixel brightness value through a sigmoid function.
In one embodiment, the set top box mapping the normalized pixel luminance values to pixel luminance values within a range of less than or equal to the maximum display luminance value using the maximum display luminance value comprises: the set-top box maps the normalized pixel brightness value to a pixel brightness value within a range less than or equal to the maximum display brightness value by the following formula:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
wherein L' represents the normalized pixel luminance value, Ld(L') represents a display luminance value of the pixel, gamma is a predetermined constant, and LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
According to an aspect of an embodiment of the present invention, there is provided a set top box, including: the identification acquisition module is used for acquiring the extended display identification of the television terminal; the brightness value acquisition module is used for acquiring the maximum display brightness value supported by the television terminal by using the extended display identifier; and the brightness value mapping module is used for mapping the brightness value of the pixel in the high dynamic range into the brightness value of the pixel in the range less than or equal to the maximum display brightness value by using the maximum display brightness value.
In one embodiment, the identity acquisition module is to: and acquiring the extended display identifier of the television terminal from the electrically erasable programmable read-only memory of the television terminal through the high-definition multimedia interface.
In one embodiment, the luminance value obtaining module is configured to: and inquiring a pre-established database storing the corresponding relation between the vendor special data block and the maximum display brightness value supported by the television terminal by using the vendor special data block in the extended display identifier to obtain the maximum display brightness value supported by the television terminal.
In one embodiment, the luminance value mapping module includes: a normalization unit for mapping pixel luminance values within a high dynamic range to normalized pixel luminance values using a maximum display luminance value; a luminance value mapping unit for mapping the normalized pixel luminance value to a pixel luminance value within a range of the maximum display luminance value or less by using the maximum display luminance value.
In one embodiment, the normalization unit is configured to: taking the maximum display brightness value as a base, and solving the logarithm of the pixel brightness value in the high dynamic range; the logarithm of pixel intensity values in the high dynamic range is mapped to normalized pixel intensity values by a sigmoid function.
In one embodiment, the luminance value mapping unit is configured to: mapping the normalized pixel luminance values to pixel luminance values within a range of less than or equal to a maximum display luminance value by the following equation:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
wherein L' represents the normalized pixel luminance value, Ld(L') represents a display luminance value of the pixel, gamma is a predetermined constant, and LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
According to still another aspect of the embodiments of the present invention, there is provided a set top box, including: a memory; and a processor coupled to the memory, the processor configured to perform the aforementioned method of determining the display brightness value based on instructions stored in the memory.
According to still another aspect of the embodiments of the present invention, there is provided a computer-readable storage medium storing computer instructions which, when executed by a processor, implement the foregoing method for determining a display brightness value.
The invention can improve the video experience of the television terminal under the condition of not modifying the television terminal.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for determining a display luminance value according to an embodiment of the present invention.
Fig. 2 is a flow chart illustrating a mapping method of pixel luminance values according to an embodiment of the present invention.
Fig. 3 shows a schematic structural diagram of a set-top box according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a luminance value mapping module according to an embodiment of the present invention.
Fig. 5 shows a schematic structural diagram of another embodiment of the set-top box of the present invention.
Fig. 6 shows a schematic structural diagram of a set-top box according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described above, the high dynamic range (peak 1000nit) is mapped to the standard dynamic range (peak 100nit) in the conventional method. However, with the development of television technology, the maximum brightness supported by the television panel is often much greater than one hundred nits. The patent provides a method for mapping a dynamic range of a display capability of a set top box self-adaptive television terminal aiming at playing a high dynamic range video, so as to improve video experience.
The method for determining the display brightness value according to an embodiment of the present invention is described below with reference to fig. 1.
Fig. 1 is a flowchart illustrating a method for determining a display luminance value according to an embodiment of the present invention. As shown in fig. 1, the method for determining the display luminance value of this embodiment includes:
and step S102, the set top box acquires an extended display identifier of the television terminal.
EDID (Extended display identification) is usually located in the eeprom of the tv terminal. The set-top box may obtain the extended display identifier of the tv terminal through an HDMI (High Definition Multimedia Interface).
And step S104, the set top box acquires the maximum display brightness value supported by the television terminal by using the extended display identifier.
Bytes 9 to 18 in EDID are defined as VSDB, (Vendor Specific Data Block). The VSDB includes a manufacturer name, a product code, a product serial number, a manufacturing week, and a manufacturing year. Under the condition that a database storing the mapping relation between the VSDB and the maximum display brightness value supported by the television terminal is established in advance, the set-top box can query the pre-established database storing the corresponding relation between the vendor special data block and the maximum display brightness value supported by the television terminal by using the VSDB in the EDID so as to obtain the maximum display brightness value supported by the television terminal. Those skilled in the art will understand that the VSDB in the EDID can be used to find the manufacturer's specification in a pre-established database, and obtain the maximum display brightness supported by the tv from the manufacturer's specification.
And step S106, the set top box maps the pixel brightness value in the high dynamic range into the pixel brightness value in the range less than or equal to the maximum display brightness value by using the maximum display brightness value.
For example, if the maximum display brightness value of the television terminal acquired by the set-top box is 500nit, the set-top box may map the pixel brightness value of the highest 1000nit brightness range represented by the SMPTE-2084 transfer characteristic curve to the highest 500nit brightness range represented by the gamma characteristic curve, thereby widening the range of the display pixel brightness values.
The embodiment provides a method for the high dynamic range set top box to adapt to the display capability of a television terminal, perform dynamic range mapping and improve video experience. The set top box firstly acquires the display capacity data of the television terminal, then judges the maximum brightness which can be supported by the television display panel according to the display capacity data of the television terminal, namely judges the brightness value range which can be supported by the television terminal, and then dynamically displays the brightness value mapping on the high dynamic range video, thereby effectively utilizing the advantages of the high dynamic range video, realizing the dynamic range expansion of the display brightness value on the traditional SDR television terminal, effectively expanding the dynamic range output by the SDR television terminal, improving the video experience of users, and being particularly suitable for the application scene of carrying out full 4K services on the scale of the IPTV at present.
The method for mapping the luminance values of the pixels in step S106 is described below with reference to fig. 2.
Fig. 2 is a flow chart illustrating a mapping method of pixel luminance values according to an embodiment of the present invention. As shown in fig. 2, the mapping method of the pixel brightness value in this embodiment includes:
step S2062, the set-top box utilizes the maximum display brightness value LmaxThe pixel luminance values in the high dynamic range are mapped to normalized pixel luminance values L'.
For example, the set-top box displays the luminance value L at the maximummaxTo this end, the logarithm of the pixel luminance value L in the high dynamic range is found. And then, the set top box maps the logarithm of the pixel brightness value L in the high dynamic range into a normalized pixel brightness value through a sigmoid function. The process of inputting the logarithm of the pixel brightness value L in the high dynamic range into the sigmoid function to calculate the normalized pixel brightness value is not described herein again.
Step S2064, the set-top box maps the normalized pixel brightness value to a pixel brightness value within a range less than or equal to the maximum display brightness value by using the maximum display brightness value.
For example, the set-top box maps the normalized pixel luminance values to pixel luminance values within a range of less than or equal to the maximum display luminance value by the following formula:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
wherein L' represents the normalized pixel luminance value, Ld(L') represents the display brightness value of the pixel, gamma is a preset constant (usually 2.2), and LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
From the above formula, LmaxThe larger the value, LdThe larger the value is, the higher the display brightness value of the mapped pixel is, and the more the video details and the contrast are kept.
The mapping method in the embodiment can exert the highest display capability of the SDR television terminal and the experience advantage of HDR video on the SDR television terminal, improves the video experience of users, and is particularly suitable for large-scale application of HDR service even when the HDR television terminal is not scaled. The experience advantage of the high dynamic range video can be reserved to the maximum extent through the display capability of the self-adaptive television terminal.
A set-top box according to an embodiment of the invention is described below with reference to fig. 3.
Fig. 3 shows a schematic structural diagram of a set-top box according to an embodiment of the present invention. As shown in fig. 3, the set-top box 30 of the present embodiment includes:
an identifier obtaining module 302, configured to obtain an extended display identifier of the television terminal;
a brightness value obtaining module 304, configured to obtain a maximum display brightness value supported by the television terminal by using the extended display identifier;
the luminance value mapping module 306 is configured to map, by using the maximum display luminance value, the luminance value of the pixel in the high dynamic range to a luminance value of the pixel in a range that is less than or equal to the maximum display luminance value.
In one embodiment, the identity acquisition module 302 is configured to:
and acquiring the extended display identifier of the television terminal from the electrically erasable programmable read-only memory of the television terminal through the high-definition multimedia interface.
In one embodiment, the luminance value obtaining module 304 is configured to:
and inquiring a pre-established database storing the corresponding relation between the vendor special data block and the maximum display brightness value supported by the television terminal by using the vendor special data block in the extended display identifier to obtain the maximum display brightness value supported by the television terminal.
The embodiment provides a high dynamic range set top box which has self-adaptive television terminal display capability, performs dynamic range mapping and improves video experience. The set top box firstly acquires the display capacity data of the television terminal, then judges the maximum brightness which can be supported by the television display panel according to the display capacity data of the television terminal, namely judges the brightness value range which can be supported by the television terminal, and then dynamically displays the brightness value mapping on the high dynamic range video, thereby effectively utilizing the advantages of the high dynamic range video, realizing the dynamic range expansion of the display brightness value on the traditional SDR television terminal, effectively expanding the dynamic range output by the SDR television terminal, improving the video experience of users, and being particularly suitable for the application scene of carrying out full 4K services on the scale of the IPTV at present.
The luminance value mapping module of an embodiment of the present invention is described below with reference to fig. 4.
Fig. 4 is a schematic structural diagram of a luminance value mapping module according to an embodiment of the present invention. As shown in fig. 4, the luminance value mapping module 306 of the present embodiment includes:
a normalization unit 4062, configured to map the pixel luminance values in the high dynamic range into normalized pixel luminance values by using the maximum display luminance value;
a luminance value mapping unit 4064 for mapping the normalized pixel luminance values to pixel luminance values within a range of the maximum display luminance values or less using the maximum display luminance value.
In one embodiment, the normalization unit 4062 is configured to:
taking the maximum display brightness value as a base, and solving the logarithm of the pixel brightness value in the high dynamic range;
the logarithm of pixel intensity values in the high dynamic range is mapped to normalized pixel intensity values by a sigmoid function.
In one embodiment, the luminance value mapping unit 4064 is configured to:
mapping the normalized pixel luminance values to pixel luminance values within a range of less than or equal to a maximum display luminance value by the following equation:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
wherein L' represents the normalized pixel luminance value, Ld(L') represents a display luminance value of the pixel, gamma is a predetermined constant, and LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
The embodiment can exert the highest display capability and the experience advantages of HDR videos of the SDR television terminal on the SDR television terminal, improves the video experience of users, and is particularly suitable for large-scale application of HDR services even when the HDR television terminal is not scaled. The experience advantage of the high dynamic range video can be reserved to the maximum extent through the display capability of the self-adaptive television terminal.
Fig. 5 shows a schematic structural diagram of another embodiment of the set-top box of the present invention. As shown in fig. 5, the set-top box 50 of this embodiment includes: a memory 510 and a processor 520 coupled to the memory 510, the processor 520 being configured to perform a method of determining a display brightness value in any of the embodiments described above based on instructions stored in the memory 510.
Fig. 6 shows a schematic structural diagram of a set-top box according to still another embodiment of the present invention. As shown in fig. 6, the set-top box 60 of this embodiment includes: the memory 510 and the processor 520 may further include an input/output interface 630, a network interface 640, a storage interface 650, and the like. These interfaces 630, 640, 650 and the memory 510 and the processor 520 may be connected by a bus 650, for example. The input/output interface 630 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 640 provides a connection interface for various networking devices. The storage interface 650 provides a connection interface for external storage devices such as an SD card and a usb disk.
The present invention also includes a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method of determining a display brightness value in any of the foregoing embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for determining a display brightness value, comprising:
the set top box acquires an extended display identifier of the television terminal;
the set top box queries a pre-established database storing the corresponding relation between the manufacturer special data block and the maximum display brightness value supported by the television terminal by using the manufacturer special data block in the extended display identifier to obtain the maximum display brightness value supported by the television terminal;
the set top box uses the maximum display brightness value to map the pixel brightness value in the high dynamic range to be less than or equal to the pixel brightness value in the maximum display brightness value range, and the method comprises the following steps: the set top box takes the maximum display brightness value as a base, and calculates the logarithm of the pixel brightness value in the high dynamic range; the set top box maps the logarithm of the pixel brightness value in the high dynamic range into a normalized pixel brightness value through a sigmoid function; the set-top box maps the normalized pixel brightness value to a pixel brightness value within the range of the maximum display brightness value or less by the following formula:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground；
wherein L' represents the normalized pixel luminance value, Ld(L') represents a display luminance value of the pixel, gamma is a predetermined constant, LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
2. The determination method of claim 1, wherein the set top box obtaining the extended display identifier of the television terminal comprises:
the set-top box acquires the extended display identifier of the television terminal from the electrically erasable programmable read-only memory of the television terminal through the high-definition multimedia interface.
3. A set top box, comprising:
the identification acquisition module is used for inquiring a pre-established database which stores the corresponding relation between the manufacturer special data block and the maximum display brightness value supported by the television terminal by using the manufacturer special data block in the extended display identification to acquire the maximum display brightness value supported by the television terminal;
the brightness value acquisition module is used for acquiring the maximum display brightness value supported by the television terminal by using the extended display identifier;
a luminance value mapping module, configured to map, by using the maximum display luminance value, a luminance value of a pixel in a high dynamic range to a luminance value of a pixel in a range that is less than or equal to the maximum display luminance value, including: the normalization unit is used for solving the logarithm of the pixel brightness value in the high dynamic range by taking the maximum display brightness value as a base; mapping the logarithm of pixel luminance values within the high dynamic range to the normalized pixel luminance values by a sigmoid function; the luminance value mapping unit is configured to: mapping the normalized pixel luminance values to pixel luminance values within the range of less than or equal to the maximum display luminance value by the following formula:
Ld(L')＝(L')gamma×(Lmax-Lblack)+Lblack+Lbackground；
wherein L' represents the normalized pixel luminance value, Ld(L') represents a display luminance value of the pixel, gamma is a predetermined constant, LmaxIndicating the maximum display brightness value, L, supported by the television terminalblackIndicating a black pixel display luminance value, LbackgroundRepresenting the value of the background light brightness reflected by the screen of the television terminal.
4. The set top box of claim 3, wherein the identity acquisition module is to:
and acquiring the extended display identifier of the television terminal from the electrically erasable programmable read-only memory of the television terminal through the high-definition multimedia interface.
5. A set top box, comprising:
a memory; and
a processor coupled to the memory, the processor being configured to perform the method of determining display brightness values of claim 1 or 2 based on instructions stored in the memory.
6. A computer-readable storage medium storing computer instructions which, when executed by a processor, implement the method of determining a display brightness value of claim 1 or 2.
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| CN106170102A (en) * | 2015-05-21 | 2016-11-30 | 三星电子株式会社 | For exporting apparatus and method and the display device of content |
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