CN109391855A - The determination method and set-top box of display brightness value - Google Patents
The determination method and set-top box of display brightness value Download PDFInfo
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- CN109391855A CN109391855A CN201710672985.6A CN201710672985A CN109391855A CN 109391855 A CN109391855 A CN 109391855A CN 201710672985 A CN201710672985 A CN 201710672985A CN 109391855 A CN109391855 A CN 109391855A
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- brightness value
- top box
- display brightness
- maximum display
- television terminal
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- H—ELECTRICITY
- 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
Abstract
The invention discloses a kind of determination method of display brightness value and set-top boxes, are related to technical field of video processing.Determination side therein includes: the extending display identification that set-top box obtains television terminal；Set-top box obtains the maximum display brightness value that television terminal is supported using extending display identification；Set-top box utilizes maximum display brightness value, and the pixel brightness value in high dynamic range is mapped as to the pixel brightness value being less than or equal within the scope of maximum display brightness value.To promote the video tastes of television terminal in the case where not being transformed to television terminal.
Description
Technical field
The present invention relates to technical field of video processing, in particular to the determination method and machine of a kind of pixel display brightness value
Top box.
Background technique
The rapid innovation of video technique, developing to second stage from the promotion of first stage resolution ratio includes high-resolution
The comprehensive promotion of rate, high frame per second, high dynamic range, wide colour gamut, high-bit width.Wherein user video experience is promoted the most obvious
Be HDR (High-Dynamic Range, high dynamic range) technology, the scene details that the bigger video of dynamic range is shown is more
More, visual effect is better.
However, since high dynamic range needs the television terminal of new support HDR function that could support, if user uses
Traditional SDR (Standard-Dynamic Range, standard dynamic range) television terminal, set-top box often regard high dynamic range
Frequency tone mapping (Tone mapping) arrives standard dynamic range (0-100nit), therefore can not utilize high dynamic range video
The detailed information such as light levels and contrast, video tastes are poor.
Summary of the invention
The technical problem that the present invention solves is, how in the case where not being transformed to television terminal, promotes electricity
Depending on video tastes of the terminal in terms of brightness.
According to an aspect of an embodiment of the present invention, a kind of determination method of display brightness value is provided, comprising: set-top box
Obtain the extending display identification of television terminal；Set-top box is shown bright using the maximum that extending display identification obtains television terminal support
Angle value；Set-top box utilizes maximum display brightness value, the pixel brightness value in high dynamic range is mapped as being less than or equal to maximum aobvious
Show the pixel brightness value in range of luminance values.
In one embodiment, the extending display identification that set-top box obtains television terminal includes: that set-top box passes through high-resolution
Multimedia interface is spent, the extending display identification of television terminal is obtained from the Electrically Erasable Programmable Read-Only Memory of television terminal.
In one embodiment, set-top box obtains the maximum display brightness value that television terminal is supported using extending display identification
Include: set-top box using manufacturer's special data block in extending display identification, inquire pre-establish be stored with the special number of manufacturer
The database for the corresponding relationship between maximum display brightness value supported according to block and television terminal obtains television terminal and supports most
Big display brightness value.
In one embodiment, set-top box utilizes maximum display brightness value, and the pixel brightness value in high dynamic range is reflected
It penetrates to include: that set-top box utilizes maximum display brightness value less than or equal to the pixel brightness value within the scope of maximum display brightness value, it will
Pixel brightness value in high dynamic range is mapped as normalized pixel brightness value；Set-top box utilizes maximum display brightness value, will
Normalized pixel brightness value is mapped as the pixel brightness value being less than or equal within the scope of maximum display brightness value.
In one embodiment, set-top box utilizes maximum display brightness value, and the pixel brightness value in high dynamic range is reflected
Penetrating as normalized pixel brightness value includes: set-top box using maximum display brightness value the bottom of as, asks the pixel in high dynamic range bright
The logarithm of angle value；The logarithmic mapping of pixel brightness value in high dynamic range is normalization by sigmoid function by set-top box
Pixel brightness value.
In one embodiment, set-top box utilizes maximum display brightness value, normalized pixel brightness value is mapped as small
In be equal to maximum display brightness value within the scope of pixel brightness value include: that set-top box is bright by normalized pixel by following formula
Angle value is mapped as the pixel brightness value being less than or equal within the scope of maximum display brightness value:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is default
Constant, LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIndicate black picture element display brightness value, Lbackground
Indicate the background light level value of television terminal screen reflection.
According to an aspect of an embodiment of the present invention, a kind of set-top box is provided, comprising: identifier acquisition module, for obtaining
Take the extending display identification of television terminal；Brightness value obtains module, supports for obtaining television terminal using extending display identification
Maximum display brightness value；Brightness value mapping block, it is for utilizing maximum display brightness value, the pixel in high dynamic range is bright
Angle value is mapped as the pixel brightness value being less than or equal within the scope of maximum display brightness value.
In one embodiment, identifier acquisition module is used for: by high-definition multimedia interface, from the electricity of television terminal
The extending display identification of television terminal is obtained in erasable programmable read-only memory.
In one embodiment, brightness value obtains module and is used for: using manufacturer's special data block in extending display identification,
Inquire the corresponding pass being stored between manufacturer's special data block and the maximum display brightness value that television terminal is supported pre-established
The database of system obtains the maximum display brightness value that television terminal is supported.
In one embodiment, brightness value mapping block includes: normalization unit, for utilizing maximum display brightness value,
Pixel brightness value in high dynamic range is mapped as normalized pixel brightness value；Brightness value map unit, for using most
Normalized pixel brightness value, is mapped as the pixel intensity being less than or equal within the scope of maximum display brightness value by big display brightness value
Value.
In one embodiment, normalization unit is used for: using maximum display brightness value the bottom of as, seeking the picture in high dynamic range
The logarithm of plain brightness value；By sigmoid function by the logarithmic mapping of the pixel brightness value in high dynamic range be it is normalized
Pixel brightness value.
In one embodiment, brightness value map unit is used for: being reflected normalized pixel brightness value by following formula
It penetrates as less than or equal to the pixel brightness value within the scope of maximum display brightness value:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is default
Constant, LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIndicate black picture element display brightness value, Lbackground
Indicate the background light level value of television terminal screen reflection.
Another aspect according to an embodiment of the present invention provides a kind of set-top box, comprising: memory；And it is coupled to
The processor of memory, the processor are configured as executing display brightness value above-mentioned based on instruction stored in memory
Determination method.
Another aspect according to an embodiment of the present invention provides a kind of computer readable storage medium, computer-readable
Storage medium is stored with computer instruction, which realizes the determination method of display brightness value above-mentioned when being executed by processor.
The present invention can promote the video tastes of television terminal in the case where not being transformed to television terminal.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 shows the flow diagram of the determination method of the display brightness value of one embodiment of the invention.
Fig. 2 shows the flow diagrams of the mapping method of the pixel brightness value of one embodiment of the invention.
Fig. 3 shows the structural schematic diagram of the set-top box of one embodiment of the invention.
Fig. 4 shows the structural schematic diagram of the brightness value mapping block of one embodiment of the invention.
Fig. 5 shows the structural schematic diagram of another embodiment of set-top box of the present invention.
Fig. 6 shows the structural schematic diagram of another embodiment of set-top box of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under all other embodiment obtained, shall fall within the protection scope of the present invention.
As described above, high dynamic range (peak value 1000nit) is mapped to standard dynamic range (peak value in conventional method
100nit).However as the development of television technologies, the maximum brightness that TV set panel can be supported at present is often all much larger than
100 nits.This patent is directed to the broadcasting of high dynamic range video, proposes a kind of adaptive television terminal display energy of set-top box
Power carries out dynamic range mapping, and then the method for promoting video tastes.
The determination method of the display brightness value of one embodiment of the invention is introduced below with reference to Fig. 1.
Fig. 1 shows the flow diagram of the determination method of the display brightness value of one embodiment of the invention.Such as Fig. 1 institute
Show, the determination method of the display brightness value of the embodiment includes:
Step S102, set-top box obtain the extending display identification of television terminal.
EDID (Extended display identification data, extending display identification) is usually located at TV end
In the Electrically Erasable Programmable Read-Only Memory at end.Set-top box can pass through HDMI (High Definition Multimedia
Interface, high-definition multimedia interface), obtain the extending display identification of television terminal.
Step S104, set-top box obtain the maximum display brightness value that television terminal is supported using extending display identification.
The the 9th to the 18th byte in EDID is defined as VSDB, (Vendor Specific Data Block, manufacturer
Special data block).Wherein, VSDB specifically includes manufacturer's name, product code, product ID, manufacture week, year built.?
In the case of pre-establishing the database for having the mapping relations between the maximum display brightness value that VSDB and television terminal are supported, machine
Top box can use the VSDB in EDID, inquires the manufacturer's special data block that is stored with pre-established and supports most with television terminal
The database of corresponding relationship between big display brightness value, to obtain the maximum display brightness value of television terminal support.This field
It should be understood to the one skilled in the art that can use the technical specification that the VSDB in EDID finds manufacturer in the database pre-established,
And television set is got from the technical specification of manufacturer and supports maximum display brightness.
Step S106, set-top box utilize maximum display brightness value, the pixel brightness value in high dynamic range are mapped as small
In the pixel brightness value being equal within the scope of maximum display brightness value.
For example, the maximum display brightness value for the television terminal that set-top box obtains is 500nit, then set-top box can will be with
The pixel brightness value of the highest 1000nit brightness range of SMPTE-2084 transfer characteristic curve characterization is mapped to gamma characteristic
The highest 500nit brightness range of curve characterization, to widen the range of display pixel brightness value.
Above-described embodiment proposes a kind of adaptive television terminal display capabilities of high dynamic range set-top box, carries out dynamic model
Mapping is enclosed, the method for promoting video tastes.Set-top box obtains the display capabilities data of television terminal first, then according to TV end
The display capabilities data at end judge the maximum brightness that television display panel can be supported, that is, judge that television terminal can be supported bright
Angle value range, then high dynamic range video is subjected to dynamic display brightness value and is mapped, high dynamic range view is effectively utilized
The advantage of frequency realizes the dynamic range expansion of display brightness value on traditional SDR television terminal, effectively extends SDR electricity
Depending on the dynamic range of terminal output, the video tastes of user are improved, carry out full 4K industry especially suitable for current IPTV scale
The application scenarios of business.
Below with reference to the mapping method of pixel brightness value in Fig. 2 introduction step S106.
Fig. 2 shows the flow diagrams of the mapping method of the pixel brightness value of one embodiment of the invention.Such as Fig. 2 institute
Show, the mapping method of the pixel brightness value in the embodiment includes:
Step S2062, set-top box utilize maximum display brightness value Lmax, the pixel brightness value in high dynamic range is mapped
For normalized pixel brightness value L'.
For example, set-top box is with maximum display brightness value LmaxThe bottom of for, the logarithm of the pixel brightness value L in high dynamic range is sought.
Then, the logarithmic mapping of the pixel brightness value L in high dynamic range is normalized pixel by sigmoid function by set-top box
Brightness value.The logarithm input sigmoid function of pixel brightness value L in high dynamic range is calculated into normalized pixel brightness value
Process this will not be repeated here.
Step S2064, set-top box utilize maximum display brightness value, normalized pixel brightness value are mapped as being less than or equal to
Pixel brightness value within the scope of maximum display brightness value.
For example, normalized pixel brightness value is mapped as being less than or equal to maximum display brightness by following formula by set-top box
The pixel brightness value being worth in range:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is default
Constant (usual value 2.2), LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIt is bright to indicate that black picture element is shown
Angle value, LbackgroundIndicate the background light level value of television terminal screen reflection.
As can be seen from the above equation, LmaxValue is bigger, LdValue is bigger, and the display brightness value of pixel is higher after mapping, video
Details, contrast just retain more.
Mapping method in above-described embodiment, the highest that SDR television terminal can be played on SDR television terminal show energy
The experience advantage of power and HDR video, promotes the video tastes of user, even if especially suitable for not becoming in HDR television terminal
The scale application of HDR business is carried out when scale.By the display capabilities of adaptive television terminal, maximum can retain
The experience advantage of high dynamic range video.
The set-top box of one embodiment of the invention is introduced below with reference to Fig. 3.
Fig. 3 shows the structural schematic diagram of the set-top box of one embodiment of the invention.As shown in figure 3, the machine of the present embodiment
Top box 30 includes:
Identifier acquisition module 302, for obtaining the extending display identification of television terminal；
Brightness value obtains module 304, for obtaining the maximum display brightness that television terminal is supported using extending display identification
Value；
Brightness value mapping block 306 reflects the pixel brightness value in high dynamic range for utilizing maximum display brightness value
It penetrates as less than or equal to the pixel brightness value within the scope of maximum display brightness value.
In one embodiment, identifier acquisition module 302 is used for:
By high-definition multimedia interface, it is whole that TV is obtained from the Electrically Erasable Programmable Read-Only Memory of television terminal
The extending display identification at end.
In one embodiment, brightness value obtains module 304 and is used for:
Using manufacturer's special data block in extending display identification, inquire pre-establish be stored with manufacturer's special data block
It is aobvious to obtain the maximum that television terminal is supported for the database for the corresponding relationship between maximum display brightness value supported with television terminal
Show brightness value.
Above-described embodiment proposes a kind of with adaptive television terminal display capabilities, progress dynamic range mapping, promotion
The high dynamic range set-top box of video tastes.Set-top box obtains the display capabilities data of television terminal first, then according to TV
The display capabilities data of terminal judge the maximum brightness that television display panel can be supported, that is, judge what television terminal can be supported
Range of luminance values, then high dynamic range video is subjected to dynamic display brightness value and is mapped, high dynamic range is effectively utilized
The advantage of video realizes the dynamic range expansion of display brightness value on traditional SDR television terminal, effectively extends SDR
The dynamic range of television terminal output, improves the video tastes of user, carries out full 4K especially suitable for current IPTV scale
The application scenarios of business.
The brightness value mapping block of one embodiment of the invention is introduced below with reference to Fig. 4.
Fig. 4 shows the structural schematic diagram of the brightness value mapping block of one embodiment of the invention.As shown in figure 4, this reality
The brightness value mapping block 306 for applying example includes:
Normalization unit 4062 maps the pixel brightness value in high dynamic range for utilizing maximum display brightness value
For normalized pixel brightness value；
Normalized pixel brightness value is mapped as by brightness value map unit 4064 for utilizing maximum display brightness value
Less than or equal to the pixel brightness value within the scope of maximum display brightness value.
In one embodiment, normalization unit 4062 is used for:
Using maximum display brightness value the bottom of as, the logarithm of the pixel brightness value in high dynamic range is sought；
By sigmoid function by the logarithmic mapping of the pixel brightness value in high dynamic range be normalized pixel intensity
Value.
In one embodiment, brightness value map unit 4064 is used for:
Normalized pixel brightness value is mapped as being less than or equal within the scope of maximum display brightness value by following formula
Pixel brightness value:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is default
Constant, LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIndicate black picture element display brightness value, Lbackground
Indicate the background light level value of television terminal screen reflection.
Above-described embodiment can play the highest display capabilities and HDR video of SDR television terminal on SDR television terminal
Experience advantage promotes the video tastes of user, though especially suitable for when HDR television terminal does not become scale into
The scale application of row HDR business.It, can maximum reservation high dynamic range view by the display capabilities of adaptive television terminal
The experience advantage of frequency.
Fig. 5 shows the structural schematic diagram of another embodiment of set-top box of the present invention.As shown in figure 5, the embodiment
Set-top box 50 includes: memory 510 and the processor 520 for being coupled to the memory 510, and processor 520 is configured as being based on
The instruction being stored in memory 510 executes the determination method of the display brightness value in any one aforementioned embodiment.
Wherein, memory 510 is such as may include system storage, fixed non-volatile memory medium.System storage
Device is for example stored with operating system, application program, Boot loader (Boot Loader) and other programs etc..
Fig. 6 shows the structural schematic diagram of another embodiment of set-top box of the present invention.As shown in Fig. 6, the embodiment
Set-top box 60 includes: memory 510 and processor 520, can also include input/output interface 630, network interface 640, deposit
Store up interface 650 etc..Bus can for example be passed through between these interfaces 630,640,650 and memory 510 and processor 520
650 connections.Wherein, input/output interface 630 is display, the input-output equipment such as mouse, keyboard, touch screen provide connection and connect
Mouthful.Network interface 640 provides connecting interface for various networked devices.Memory interface 650 is the external storages such as SD card, USB flash disk
Connecting interface is provided.
The invention also includes a kind of computer readable storage mediums, are stored thereon with computer instruction, and the instruction is processed
Device realizes the determination method of the display brightness value in any one aforementioned embodiment when executing.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The calculating implemented in non-transient storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) can be used
The form of machine program product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of determination method of display brightness value characterized by comprising
The extending display identification of set-top box acquisition television terminal；
Set-top box obtains the maximum display brightness value that television terminal is supported using the extending display identification；
Set-top box utilizes the maximum display brightness value, the pixel brightness value in high dynamic range is mapped as being less than or equal to described
Pixel brightness value within the scope of maximum display brightness value.
2. determining method as described in claim 1, which is characterized in that the extension that the set-top box obtains television terminal shows mark
Knowledge includes:
Set-top box obtains TV from the Electrically Erasable Programmable Read-Only Memory of television terminal by high-definition multimedia interface
The extending display identification of terminal.
3. determining method as described in claim 1, which is characterized in that the set-top box is obtained using the extending display identification
Television terminal support maximum display brightness value include:
Set-top box using manufacturer's special data block in the extending display identification, inquire pre-establish to be stored with manufacturer special
The database for the corresponding relationship between maximum display brightness value that data block and television terminal are supported, obtains what television terminal was supported
Maximum display brightness value.
4. determining method as described in claim 1, which is characterized in that the set-top box utilizes the maximum display brightness value,
Pixel brightness value in high dynamic range is mapped as to the pixel brightness value being less than or equal within the scope of the maximum display brightness value
Include:
Set-top box utilizes the maximum display brightness value, and the pixel brightness value in high dynamic range is mapped as normalized pixel
Brightness value；
Set-top box utilizes the maximum display brightness value, normalized pixel brightness value is mapped as being less than or equal to described maximum aobvious
Show the pixel brightness value in range of luminance values.
5. determining method as claimed in claim 4, which is characterized in that the set-top box utilizes the maximum display brightness value,
Pixel brightness value in high dynamic range, which is mapped as normalized pixel brightness value, includes:
Set-top box seeks the logarithm of the pixel brightness value in the high dynamic range using the maximum display brightness value bottom of as；
The logarithmic mapping of pixel brightness value in the high dynamic range is the normalization by sigmoid function by set-top box
Pixel brightness value.
6. determining method as claimed in claim 4, which is characterized in that the set-top box utilizes the maximum display brightness value,
Include: by the pixel brightness value that normalized pixel brightness value is mapped as being less than or equal within the scope of the maximum display brightness value
Normalized pixel brightness value is mapped as being less than or equal to the maximum display brightness value model by following formula by set-top box
Enclose interior pixel brightness value:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is preset constant,
LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIndicate black picture element display brightness value, LbackgroundIndicate electricity
Depending on the background light level value of terminal screen reflection.
7. a kind of set-top box characterized by comprising
Identifier acquisition module, for obtaining the extending display identification of television terminal；
Brightness value obtains module, for obtaining the maximum display brightness value that television terminal is supported using the extending display identification；
Brightness value mapping block maps the pixel brightness value in high dynamic range for utilizing the maximum display brightness value
For less than or equal to the pixel brightness value within the scope of the maximum display brightness value.
8. set-top box as claimed in claim 7, which is characterized in that the identifier acquisition module is used for:
By high-definition multimedia interface, television terminal is obtained from the Electrically Erasable Programmable Read-Only Memory of television terminal
Extending display identification.
9. set-top box as claimed in claim 7, which is characterized in that the brightness value obtains module and is used for:
Using manufacturer's special data block in the extending display identification, inquire pre-establish be stored with manufacturer's special data block
It is aobvious to obtain the maximum that television terminal is supported for the database for the corresponding relationship between maximum display brightness value supported with television terminal
Show brightness value.
10. set-top box as claimed in claim 7, which is characterized in that the brightness value mapping block includes:
Pixel brightness value in high dynamic range is mapped as returning by normalization unit for utilizing the maximum display brightness value
One pixel brightness value changed；
Normalized pixel brightness value is mapped as being less than by brightness value map unit for utilizing the maximum display brightness value
Equal to the pixel brightness value within the scope of the maximum display brightness value.
11. set-top box as claimed in claim 10, which is characterized in that the normalization unit is used for:
Using the maximum display brightness value bottom of as, the logarithm of the pixel brightness value in the high dynamic range is sought；
By sigmoid function by the logarithmic mapping of the pixel brightness value in the high dynamic range be the normalized pixel
Brightness value.
12. set-top box as claimed in claim 10, which is characterized in that the brightness value map unit is used for:
Normalized pixel brightness value is mapped as being less than or equal within the scope of the maximum display brightness value by following formula
Pixel brightness value:
Ld(L')=(L')gamma×(Lmax-Lblack)+Lblack+Lbackground
Wherein, L' indicates normalized pixel brightness value, Ld(L') the display brightness value of pixel is indicated, gamma is preset constant,
LmaxIndicate the maximum display brightness value that television terminal is supported, LblackIndicate black picture element display brightness value, LbackgroundIndicate electricity
Depending on the background light level value of terminal screen reflection.
13. a kind of set-top box characterized by comprising
Memory；And
It is coupled to the processor of the memory, the processor is configured to the instruction based on storage in the memory,
Execute the determination method such as display brightness value described in any one of claims 1 to 6.
14. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to
It enables, the determination method of display brightness value described in any one of claims 1 to 6 is realized when described instruction is executed by processor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110264938A (en) * | 2019-06-27 | 2019-09-20 | 江苏芯盛智能科技有限公司 | Image display method and apparatus |
| CN117133252A (en) * | 2023-02-27 | 2023-11-28 | 荣耀终端有限公司 | Image processing method and electronic device |
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