CN106101679B - The processing method and processing system of high dynamic range signal - Google Patents
The processing method and processing system of high dynamic range signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/57—Control of the dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
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Abstract
The present invention discloses the processing method and processing system of a kind of high dynamic range signal.The processing method：Obtain the electro-optic conversion curve type of high dynamic range signal；The high-high brightness information in high dynamic range signal metadata is obtained, high-high brightness information corresponding output valve in electro-optic conversion curve is signal maximum brightness value；Intercept primitive curve section in the electro-optic conversion curve of high dynamic range signal, the output valve of primitive curve section is from zero to signal maximum brightness value；If the brightness for needing to reach is map intensity values, the ratio of map intensity values and signal maximum brightness value is mapping coefficient；In the case where abscissa is constant, the ordinate output valve of primitive curve section is carried out equal proportion according to mapping coefficient and map to form mapping electro-optic conversion curved section.The processing system includes gamma calling module, dynamic mapping module, Gamma correction module；The processing method and processing system can solve the problem that HDR signals are overall partially secretly, be unable to reach the problem of brightness for needing to reach.
Description
Technical field
The present invention relates to signal processing technology field, more particularly to a kind of processing method of high dynamic range signal and processing
System.
Background technology
HDR (High-Dynamic Range, abbreviation HDR) image, compared to common image, can be provided more
More dynamic ranges and image detail, according to the standard dynamic range (Standard-Dynamic of different time for exposure
Range, abbreviation SDR) image, final HDR image is synthesized using the SDR image of corresponding optimal details of each time for exposure,
The visual effect that can preferably reflect in people's true environment.
Gamma (gamma) standard is different used by HDR and SDR (standard dynamic range) signal, HDR signals
After Gamma requirements are carried out according to standards such as SMPTE 2084, HLG (Hybrid Log Gamma logarithms gamma is distributed, abbreviation HLG)
Phase is made, and SDR signals then require to carry out post-production according to Gamma 2.2, Gamma2.4 etc., therefore we are being reduced
When, it can also be reduced according to corresponding Gamma；The LCD screen of Most current is all SDR screen, i.e. screen
Gamma standards are Gamma2.2.
For HDR signals, multiple standards be present in existing post production process, after being carried out with SMPTE2084 standards
Exemplified by phase makes, its high-high brightness there may be many kinds, by taking 600nit, 1000nit, 4000nit as an example, if directly invoked
The brightness section of SMPTE2084, SMPTE2084 curve output is 0-10000nit, and HDR signals turn by SMPTE2084 curves
The maximum brightness value of output signal is 600nit, 1000nit, 4000nit after change, the maximum brightness value that only screen can be shown
6 percent, 1/10th, 4/10ths.The significantly reduction of display brightness, the brightness for needing to reach is unable to reach, is not had
The advantage of HDR signals is given full play to, brightness and details in a play not acted out on stage, but told through dialogues details can not be taken into account by causing effect to show.
Above- mentioned information is only used for strengthening the understanding of the background to the present invention, therefore it disclosed in the background section
It can include not forming the information to prior art known to persons of ordinary skill in the art.
The content of the invention
A primary object of the present invention is at least one deficiency for overcoming above-mentioned prior art, there is provided a kind of high dynamic
The processing method and processing system of range signal, to solve the problems, such as that HDR signals are unable to reach the brightness for needing to reach.
For achieving the above object, the present invention adopts the following technical scheme that：
According to an aspect of the invention, there is provided a kind of processing method of high dynamic range signal,
Obtain the electro-optic conversion curve type of the high dynamic range signal；
The high-high brightness information in the high dynamic range signal metadata is obtained, the high-high brightness information is in the electricity
Corresponding output valve is signal maximum brightness value in light transformation curve；
Primitive curve section, the output valve of the primitive curve section are intercepted in the electro-optic conversion curve of high dynamic range signal
For from zero to the signal maximum brightness value；
If the brightness value for needing to reach is map intensity values, the ratio of the map intensity values and the signal maximum brightness value
It is worth for mapping coefficient；
In the coordinate system of the electro-optic conversion curve, in the case where abscissa is constant, make the primitive curve section
Ordinate output valve carries out equal proportion according to the mapping coefficient and maps to form mapping electro-optic conversion curved section.
According to another aspect of the present invention, there is provided a kind of processing system of high dynamic range signal, including：
Gamma calling module, it is standard dynamic range signal or HDR for carrying out judgement to input electrical signal
Signal, and according to the type standard of the high dynamic range signal, it is determined that being turned using the electric light corresponding with the type standard
Change curve；
Dynamic mapping module, for the high dynamic range signal of input to be passed through into mapping electro-optic conversion curved section, school
Positive gamma curve is changed to form mapping signal；
Gamma correction module, for increasing or reducing the mapping signal for inputting conventional screen by controlling, reaching makes
The output quantity of the screen gamma curve of the conventional screen is identical with the output quantity of the screen gamma curve of standard screen.
As shown from the above technical solution, the present invention provides a kind of processing method and processing system of high dynamic range signal,
By the high-high brightness information of the metadata of high dynamic range signal, corresponding output valve is mapped to needs in opto-electronic conversion curve
The brightness value reached, the high-high brightness information of high dynamic range signal is mapped with the brightness value for needing to reach, and will
Remaining brightness value of high dynamic range signal is mapped also according to mapping coefficient, makes the brightness of high dynamic range signal and screen
Value preferably cooperates, so that the brightness after screen display of high dynamic range signal is worth to and significantly carried
Height, the display effect of HDR signals is truly shown on screen；The brightness avoided in high dynamic range signal is
In the case of 4000nit, 3000nit, 1000nit, 800nit, 300nit etc., be unable to reach need reach brightness the problem of.
Brief description of the drawings
Its example embodiment is described in detail by referring to accompanying drawing, above and other feature and advantage of the invention will become
It is more obvious.
Fig. 1 is the schematic flow sheet of the processing method of high dynamic range signal of the present invention；
Fig. 2 be high dynamic range signal of the present invention the embodiment of processing method one in the electro-optic conversion curves of SMPTE 2084
Schematic diagram；
Fig. 3 is the schematic diagram of the primitive curve section intercepted from Fig. 2；
Fig. 4 is the schematic diagram of the mapping electro-optic conversion curved section formed after original curved section in Fig. 3 is mapped；
Fig. 5 is the structural representation of the processing system of the high dynamic range signal of the present invention.
Embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, these embodiments are provided so that the present invention will
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.
Gamma generation is derived from brightness and the non-linear relation of intrinsic brilliance that human eye can recognize that, we are at Gamma
The principle of reason is intended to after treatment completely embody the optical information after camera acquisition on screen, make screen light and
The optical information matching of signal in itself；After the completion of signal content is recorded by video camera, a series of post-production can be carried out, it is right
For HDR post-production, using standards such as SMPTEST2084/HLG as opto-electronic conversion (OETF) curve.
The processing method of the high dynamic range signal of the present invention, mainly by the maximum of the metadata of high dynamic range signal
Brightness is mapped to the brightness for needing to reach.
Embodiment one：
Fig. 1 is the schematic flow sheet of the processing method of high dynamic range signal of the present invention.
Obtain the electro-optic conversion curve type of high dynamic range signal；Obtain the maximum in high dynamic range signal metadata
Monochrome information, high-high brightness information corresponding output valve in electro-optic conversion curve is signal maximum brightness value；HDR
Signal is a series of electric signal, and as the input signal of electro-optic conversion curve, different input values corresponds to different output valves,
Input value is bigger, and output valve is also bigger, so the high-high brightness information in high dynamic range signal metadata is maximum electric signal
Value, corresponding output valve is also maximum after maximum value of electrical signals inputs electro-optic conversion curve, and the output valve is signal high-high brightness
Value.
The schematic diagram of the electro-optic conversion curves of SMPTE 2084 as shown in Figure 2, its abscissa are the high dynamics for representing input
The information of range signal, scope are indicated using 0-1, have difference for non-linear value of color, the bit wide of different chips corresponding to electric signal
It is different, such as 10bit (0-1023), 12bit (0-4095)；Ordinate is the optical information of screen, and scope indicates for 0-1, and it is maximum
The value of value 1 value according to corresponding to different electro-optic conversion curve standards be it is different, using the electro-optic conversion curves of SMPTE 2084 as
Example, its maximum brightness value exported is 10000nit.
But due to multiple standards be present during the pre-production of high dynamic range signal, the high dynamic to complete
Input signal of the range signal as electro-optic conversion curve, signal maximum brightness value may be corresponding to maximum input value
4000nit, 3000nit, 1000nit, 800nit, 300nit etc.；The present embodiment is by taking 4000nit as an example.
As shown in figure 3, primitive curve section is intercepted in the electro-optic conversion curve of high dynamic range signal, primitive curve section
Output valve is from zero to signal maximum brightness value.Exemplified by the electro-optic conversion curve of the present embodiment thinks SMPTE 2084, in SMPTE
Primitive curve section is intercepted in 2084 electro-optic conversion curves, output valve 0-400nit, can be obtained corresponding to output valve from figure
Input value is 0-0.9.
As shown in figure 4, the maximum brightness value for setting the output of SMPTE2084 electro-optic conversions curve maps bright as map intensity values
The ratio of angle value and signal maximum brightness value is mapping coefficient, and the maximum brightness value of SMPTE2084 electro-optic conversion curves is
10000nit, signal maximum brightness value are 4000nit, so, the mapping coefficient in the present embodiment is 10000/4000=2.5；
In the case where abscissa keeps constant, the ordinate output valve of primitive curve section is set to carry out equal proportion according to mapping coefficient 2.5
Mapping forms mapping electro-optic conversion curved section, and several numerical value are set forth below and further illustrate mapping relations：I.e. 0.9 input value is not
Become, output valve is mapped to 10000 from 4000；0.75 input value is constant, and output valve is mapped to 2500, certain input value from 1000
For 0 when output valve be still 0.Generally, it is necessary to which the brightness value reached can be the most light of electro-optic conversion curve output
Angle value, but it is not limited to maximum brightness value.
It can also be mapped for the opto-electronic conversion curve using HLG as standard with the mapping method of the present invention.
The brightness value for needing to reach is map intensity values, and map intensity values, which are less than or equal in electro-optic conversion curve, to be exported
Maximum brightness value；Generally, map intensity values are the maximum brightness value in electro-optic conversion curve.But it is not limited to maximum
Brightness value, map intensity values can also select the numerical value for the maximum brightness value being less than in electro-optic conversion curve as needed.
By the high-high brightness information of the metadata of high dynamic range signal, corresponding output valve is reflected in opto-electronic conversion curve
The brightness value that screen needs to reach is mapped to, by the high-high brightness information of high dynamic range signal and the brightness value pair with needing to reach
It should get up, and remaining brightness value of high dynamic range signal is mapped also according to mapping coefficient, reach the display of needs
Effect；The brightness avoided in high dynamic range signal is 4000nit, 3000nit, 1000nit, 800nit's, 300nit etc.
In the case of, the problem of screen high-high brightness can not be mapped to；Output valve corresponding to all input values of high dynamic range signal obtains
To the expansion of corresponding multiple, the interval between different input values is similarly expanded, thus effect show can take into account brightness and
Details in a play not acted out on stage, but told through dialogues details.
In the case where other situations are all same as described above, map intensity values can select as needed for 9000nit,
The users such as 9500nit need the brightness value reached, so that it is determined that mapping coefficient is 9000/4000=2.25,9500/4000=
2.375 etc., then in the coordinate system of electro-optic conversion curve, make the ordinate output valve of primitive curve section according to mapping coefficient
2.25 or 2.375 grades carry out equal proportion and map to form mapping electro-optic conversion curved section.
High dynamic range signal is converted into prestacked data-signal, prestacked by above-mentioned mapping electro-optic conversion curved section
Data-signal after Gamma1/2.2 curves by being converted to mapping signal, the screen gamma using mapping signal as SDR screens
The input value of curve.Gammate curve herein is Gamma1/2.2 curves, but is not limited to Gamma1/2.2 curves, also may be used
For curves such as Gamma1/2.0.Gammate curve needs are corresponding with screen gamma curve, because gammate curve needs
Gamma1.0 curve is ultimately formed after being superimposed with screen gamma curve, but in actual debugging process, some are indivedual
Point there is deviation, cause the Gamma1.0 that whole piece curve is not standard, thus herein the purpose of gammate curve mainly with
After the superposition of screen gamma curve, mapping electro-optic conversion curved section is set not influenceed by screen gamma curve.
Prestacked data-signal is by the screen gamma curve of input SDR screens after Gamma1/2.2 Curve transforms, phase
When in having carried out a post-production to prestacked data-signal, the reduction criterion of SDR screens being complied with, so as to solve height
Dynamic range signal on common SDR screens shown the problem of.
It is not to be set according to the Gamma 2.2 of standard because the gamma value of different screen differs greatly, therefore needs
Screen Gamma2.2 is corrected.If the gamma value of the SDR screens detected is detection gamma value, by standard Gamma2.2
Standard gamma value of the curve as standard SDR screens；Compare the size of detection gamma value and standard gamma value, increased by controlling
Or reduce the mapping signal of input SDR screens, reach the output quantity and standard SDR screens of the Gamma2.2 curves for making SDR screens
Gamma2.2 curves output quantity it is identical.Because the gamma value of SDR screens is changeless, so only defeated by changing
Enter the size of value to change the size of output valve, i.e., make SDR screens by changing the size of mapping signal to reach
The output quantity of Gamma2.2 curves is identical with the output quantity of the Gamma2.2 curves of standard SDR screens.Conventional screen choosing herein
SDR screens are selected as, standard screen is standard SDR screens；The production of necessary being of the conventional screen to produce, used in life
Product, and standard screen is not present, and is conventional screen production standard, is the standard that conventional screen needs to reach.
By the identical output quantity of the Gamma2.2 curves of SDR screens and the Gamma2.2 curves of standard SDR screens, make it
Into Gamma1.0 curves after being superimposed with Gamma1/2.2；So as to ensure that HDR mapping electro-optic conversion curve passes through
It is in equal proportion transition after Gamma1.0, HDR EOTF will not be impacted, the transition of luminance point can be avoided to go wrong,
Brightness will not be caused relatively low, or brightness is higher and causes some scene saturations.
Herein using SDR screens as conventional screen, but conventional screen is not limited to SDR screens, can be it is any can be with
Screen for display.The screen gamma curve of SDR screens is screen Gamma2.2 curves, so to select and screen
The corresponding Gamma1/2.2 curves of Gamma2.2 curves are as gammate curve.
Embodiment two：
Obtain the electro-optic conversion curve type of high dynamic range signal；Obtain the maximum in high dynamic range signal metadata
Monochrome information, high-high brightness information corresponding output valve in electro-optic conversion curve is signal maximum brightness value；Determine high dynamic
The high-high brightness information of the metadata of range signal is signal maximum brightness value, and high dynamic range signal is a series of telecommunications
Number, as the input signal of electro-optic conversion curve, different input values corresponds to different output valves, and the bigger output valve of input value is also
It is bigger, so the high-high brightness information in high dynamic range signal metadata is maximum value of electrical signals, maximum value of electrical signals
Corresponding output valve is also maximum after inputting electro-optic conversion curve, and the output valve is signal maximum brightness value.
The schematic diagram of the electro-optic conversion curves of SMPTE 2084 as shown in Figure 2, its abscissa are the high dynamics for representing input
The information of range signal, scope are indicated using 0-1, have difference for non-linear value of color, the bit wide of different chips corresponding to electric signal
It is different, such as 10bit (0-1023), 12bit (0-4095)；Ordinate is the optical information of screen, and scope indicates for 0-1, and it is maximum
The value of value 1 value according to corresponding to different electro-optic conversion curve standards be it is different, using the electro-optic conversion curves of SMPTE 2084 as
Example, its maximum brightness value exported is 10000nit.Such as：
But due to multiple standards be present during the pre-production of high dynamic range signal, the high dynamic to complete
Input signal of the range signal as electro-optic conversion curve, signal maximum brightness value may be corresponding to maximum input value
4000nit, 3000nit, 1000nit, 800nit, 300nit etc.；The present embodiment is by taking 4000nit as an example.
As shown in figure 3, primitive curve section is intercepted in the electro-optic conversion curve of high dynamic range signal, primitive curve section
Output valve is from zero to signal maximum brightness value.Exemplified by the electro-optic conversion curve of the present embodiment is SMPTE 2084, in SMPTE
Primitive curve section is intercepted in 2084 electro-optic conversion curves, output valve 0-400nit, can be obtained corresponding to output valve from figure
Input value is 0-0.9.As shown in figure 4, set SMPTE2084 electro-optic conversions curve output maximum brightness value as map intensity values,
The ratio of map intensity values and signal maximum brightness value is mapping coefficient, the maximum brightness value of SMPTE2084 electro-optic conversion curves
For 10000nit, signal maximum brightness value is 4000nit, so, the mapping coefficient in the present embodiment is 10000/4000=
2.5；In the case where abscissa keeps constant, the ordinate output valve of primitive curve section is set to be carried out according to mapping coefficient 2.5 etc.
Ratio maps to form mapping electro-optic conversion curved section, and several numerical value are set forth below and further illustrate mapping relations：I.e. 0.9 input
It is worth constant, output valve is mapped to 10000 from 4000；0.75 input value is constant, and output valve is mapped to 2500 from 1000, is certainly defeated
It is still 0 to enter output valve when value is 0.Generally, it is necessary to the brightness value reached can be electro-optic conversion curve output most
Big brightness value, but it is not limited to maximum brightness value.Can also reflecting with the present invention for the opto-electronic conversion curve using HLG as standard
Shooting method is mapped.
The brightness value for needing to reach is map intensity values, and map intensity values are less than or equal in electro-optic conversion curve most
Big brightness value；Generally, map intensity values are the maximum brightness value in electro-optic conversion curve.But it is not limited to high-high brightness
Value, map intensity values can also select the numerical value for the maximum brightness value being less than in electro-optic conversion curve as needed.
By the high-high brightness information of the metadata of high dynamic range signal, corresponding output valve is reflected in opto-electronic conversion curve
The brightness value that screen needs to reach is mapped to, by the high-high brightness information of high dynamic range signal and the brightness value pair with needing to reach
It should get up, and remaining brightness value of high dynamic range signal is mapped also according to mapping coefficient, reach the display of needs
Effect；The brightness avoided in high dynamic range signal is 4000nit, 3000nit, 1000nit, 800nit's, 300nit etc.
In the case of, the problem of screen high-high brightness can not be mapped to；Output valve corresponding to all input values of high dynamic range signal obtains
To the expansion of corresponding multiple, the interval between different input values is similarly expanded, thus effect show can take into account brightness and
Details in a play not acted out on stage, but told through dialogues details.In the case where other situations are all same as described above, map intensity values can select as needed for 9000nit,
The users such as 9500nit need the brightness value reached, so that it is determined that mapping coefficient is 9000/4000=2.25,9500/4000=
2.375 etc., then in the coordinate system of electro-optic conversion curve, make the ordinate output valve of primitive curve section according to mapping coefficient
2.25th, the progress equal proportions such as 2.375 map to form mapping electro-optic conversion curved section.
By Gamma1/2.2 Curve transforms it is prestacked data-signal by high dynamic range signal, prestacked data-signal
By being converted to mapping signal after above-mentioned mapping electro-optic conversion curved section, the screen gamma using mapping signal as SDR screens
The input value of curve.Gammate curve herein is Gamma1/2.2 curves, but is not limited to Gamma1/2.2 curves, also may be used
For curves such as Gamma1/2.0.Gammate curve needs are corresponding with screen gamma curve, because gammate curve needs
Gamma1.0 curve is ultimately formed after being superimposed with screen gamma curve, but in actual debugging process, some are indivedual
Point there is deviation, cause the Gamma1.0 that whole piece curve is not standard, thus herein the purpose of gammate curve mainly with
After the superposition of screen gamma curve, mapping electro-optic conversion curved section is set not influenceed by screen gamma curve.
High dynamic range signal is passed through into Gamma1/2.2 Curve transforms, one has been carried out equivalent to prestacked data-signal
Secondary post-production, the reduction criterion of SDR screens is complied with, so as to solve high dynamic range signal on common SDR screens
The problem of being shown.
It is not to be set according to the Gamma 2.2 of standard because the gamma value of different screen differs greatly, therefore needs
Screen Gamma2.2 is corrected.If the gamma value of the SDR screens detected is detection gamma value, by standard Gamma2.2
Standard gamma value of the curve as standard SDR screens；Compare the size of detection gamma value and standard gamma value, increased by controlling
Or reduce the mapping signal of input SDR screens, reach the output quantity and standard SDR screens of the Gamma2.2 curves for making SDR screens
Gamma2.2 curves output quantity it is identical.Because the gamma value of SDR screens is changeless, so only defeated by changing
Enter the size of value to change the size of output valve, i.e., make SDR screens by changing the size of mapping signal to reach
The output quantity of Gamma2.2 curves is identical with the output quantity of the Gamma2.2 curves of standard SDR screens.Conventional screen choosing herein
SDR screens are selected as, standard screen is standard SDR screens；The production of necessary being of the conventional screen to produce, used in life
Product, and standard screen is not present, and is conventional screen production standard, is the standard that conventional screen needs to reach.
By the output quantity of the Gamma2.2 curves of SDR screens and the output quantity phase of the Gamma2.2 curves of standard SDR screens
Together, make its be superimposed with Gamma1/2.2 after into Gamma1.0 curves；So as to ensure that HDR mapping electro-optic conversion curve passes through
It is in equal proportion transition after Gamma1.0, HDR EOTF will not be impacted, the transition of luminance point can be avoided to go wrong,
Brightness will not be caused relatively low, or brightness is higher and causes some scene saturations.
Herein using SDR screens as conventional screen, but conventional screen is not limited to SDR screens, can be it is any can be with
Screen for display.The screen gamma curve of SDR screens is screen Gamma2.2 curves, so to select and screen
The corresponding Gamma1/2.2 curves of Gamma2.2 curves are as gammate curve.
In above-described embodiment one and embodiment two, it is standard dynamic range to be required to carry out judgement to the electric signal of input
Signal or high dynamic range signal.In the present invention be interception primitive curve section before by gamma calling module to input telecommunications
Number judged.Because if it is that standard dynamic range signal directly can be shown on SDR screens.
In above-described embodiment one and embodiment two, it is determined that input electric signal be high dynamic range signal after, be both needed to
Will be according to the type standard of high dynamic range signal, it is determined that using the electro-optic conversion curve corresponding with type standard.It is dynamic to height
For state range signal, can there is a type standards such as SMPTE ST2084 or HLG, the type of electro-optic conversion (OETF) curve need with
The type standards such as SMPTE ST2084 or HLG corresponding SMPTE ST2084 electro-optic conversions curves or HLG electro-optic conversion curves
Deng.
Embodiment three：
As shown in figure 5, the embodiments of the invention provide a kind of processing method phase with a kind of above-mentioned high dynamic range signal
Corresponding processing system includes：Gamma calling module, dynamic mapping module, Gamma correction module.
Gamma calling module, it is standard dynamic range signal or HDR for carrying out judgement to input electrical signal
Signal, and according to the type standard of the high dynamic range signal, it is determined that being turned using the electric light corresponding with the type standard
Change curve.
Dynamic mapping module, for the high dynamic range signal of input to be passed through into mapping electro-optic conversion curved section, Gamma1/
2.2 Curve transforms form mapping signal.
Gamma correction module, for increasing or reducing the mapping signal for inputting SDR screens by controlling, reaching makes SDR screens
The output quantity of the Gamma2.2 curves of curtain is identical with the output quantity of the Gamma2.2 curves of standard SDR screens.
The forming process of above-mentioned mapping electro-optic conversion curved section is as follows：
Obtain the electro-optic conversion curve type of the high dynamic range signal；
The high-high brightness information in the high dynamic range signal metadata is obtained, the high-high brightness information is in the electricity
Corresponding output valve is signal maximum brightness value in light transformation curve；
Intercept primitive curve section in the electro-optic conversion curve of high dynamic range signal, the output valve of primitive curve section be from
Zero arrives the signal maximum brightness value.
If the brightness value for needing to reach is map intensity values, the ratio of map intensity values and signal maximum brightness value is mapping
Coefficient.
In the coordinate system of electro-optic conversion curve, in the case where abscissa is constant, make the ordinate of primitive curve section defeated
Go out value to map to form mapping electro-optic conversion curved section according to mapping coefficient progress equal proportion.
It should be appreciated that the present invention is not limited in its application to the detailed step and flow of the method for this specification proposition
Mode.The present invention can have other embodiment, and can realize and perform in many ways.Aforesaid deformation form and
Modification is fallen within the scope of the present invention.It should be appreciated that this disclosure and the present invention limited are extended in text
And/or mentioned in accompanying drawing or all alternative combinations of two or more obvious independent features.It is all these different
Combination forms multiple alternative aspects of the present invention.Embodiment described in this specification illustrates to become known for realizing the present invention
Best mode, and will enable those skilled in the art using the present invention.
Claims (8)
- A kind of 1. processing method of high dynamic range signal, it is characterised in thatObtain the electro-optic conversion curve type of the high dynamic range signal；The high-high brightness information in the high dynamic range signal metadata is obtained, the high-high brightness information turns in the electric light It is signal maximum brightness value to change corresponding output valve in curve；Intercept primitive curve section in the electro-optic conversion curve of high dynamic range signal, the output valve of the primitive curve section be from Zero arrives the signal maximum brightness value；If the brightness value for needing to reach is map intensity values, the ratio of the map intensity values and the signal maximum brightness value is Mapping coefficient, the map intensity values are more than the signal maximum brightness value；In the coordinate system of the electro-optic conversion curve, in the case where abscissa is constant, make the vertical seat of the primitive curve section Mark output valve carries out equal proportion according to the mapping coefficient and maps to form mapping electro-optic conversion curved section.
- A kind of 2. processing method of high dynamic range signal according to claim 1, it is characterised in that the mapped luminance Value is less than or equal in the electro-optic conversion curve maximum brightness value exported.
- 3. the processing method of a kind of high dynamic range signal according to claim 1, it is characterised in that by the high dynamic Range signal is converted to prestacked data-signal by the mapping electro-optic conversion curved section, and the prestacked data-signal passes through Mapping signal is converted to after gammate curve, the input using the mapping signal as the screen gamma curve of conventional screen Value, the gammate curve are corresponding with the screen gamma curve.
- 4. the processing method of a kind of high dynamic range signal according to claim 1, it is characterised in that by the high dynamic The corrected gamma curve of range signal is converted to prestacked data-signal, and the prestacked data-signal is by the mapping electricity Mapping signal is converted to after light transformation curve section, the input using the mapping signal as the screen gamma curve of conventional screen Value, the gammate curve are corresponding with the screen gamma curve.
- 5. the processing method of a kind of high dynamic range signal according to claim 3 or 4, it is characterised in that set and detect The conventional screen screen gamma value for detection gamma value, the screen gamma value of standard screen is standard gamma value；Compare The size of the detection gamma value and the standard gamma value, inputted by controlling to increase or reduce described in the conventional screen Mapping signal, reach the defeated of the output quantity for the screen gamma curve for making the conventional screen and the screen gamma curve of standard screen Output is identical.
- 6. the processing method of a kind of high dynamic range signal according to claim 1, it is characterised in that intercepting the original It is that standard dynamic range signal or the height are dynamic that judgement is carried out to input electrical signal by gamma calling module before beginning curved section State range signal, and the type of the high dynamic range signal.
- 7. the processing method of a kind of high dynamic range signal according to claim 1, it is characterised in that according to described high dynamic The type standard of state range signal, it is determined that using the electro-optic conversion curve corresponding with the type standard.
- A kind of 8. processing system of high dynamic range signal, it is characterised in that including：Gamma calling module, it is standard dynamic range signal or HDR letter for carrying out judgement to input electrical signal Number, and according to the type standard of the high dynamic range signal, it is determined that using the electro-optic conversion corresponding with the type standard Curve；Dynamic mapping module, for the high dynamic range signal of input to be passed through into mapping electro-optic conversion curved section, correction gal Agate Curve transform forms mapping signal；Gamma correction module, for increasing or reducing the mapping signal for inputting conventional screen by controlling, reach described in making The output quantity of the screen gamma curve of conventional screen is identical with the output quantity of the screen gamma curve of standard screen；The forming process of the mapping electro-optic conversion curved section is as follows：Obtain the electro-optic conversion curve type of the high dynamic range signal；The high-high brightness information in the high dynamic range signal metadata is obtained, the high-high brightness information turns in the electric light It is signal maximum brightness value to change corresponding output valve in curve；Primitive curve section, the output valve of the primitive curve section are intercepted in the electro-optic conversion curve of the high dynamic range signal For from zero to the signal maximum brightness value；If the brightness for needing to reach is map intensity values, the ratio of the map intensity values and the signal maximum brightness value is to reflect Coefficient is penetrated, the map intensity values are more than the signal maximum brightness value；In the coordinate system of the electro-optic conversion curve, in the case where abscissa is constant, make the vertical seat of the primitive curve section Mark output valve carries out equal proportion according to the mapping coefficient and maps to form the mapping electro-optic conversion curved section.
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| CN108694030B (en) * | 2017-04-11 | 2020-07-28 | 华为技术有限公司 | Method and apparatus for processing high dynamic range images |
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| CN108200441B (en) * | 2018-01-22 | 2020-10-13 | 海信视像科技股份有限公司 | Image brightness processing method and device and electronic equipment |
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| CN109327734B (en) * | 2018-11-27 | 2020-11-13 | 成都索贝数码科技股份有限公司 | Method for down-converting HDR video to SDR video based on dynamic photometry |
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