CN106101679A - The processing method of high dynamic range signal and processing system - Google Patents
The processing method of high dynamic range signal and processing system Download PDFInfo
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- CN106101679A CN106101679A CN201610708285.3A CN201610708285A CN106101679A CN 106101679 A CN106101679 A CN 106101679A CN 201610708285 A CN201610708285 A CN 201610708285A CN 106101679 A CN106101679 A CN 106101679A
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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 processing method and the processing system of a kind of high dynamic range signal.This processing method: obtain the electro-optic conversion curve type of high dynamic range signal；Obtaining the high-high brightness information in high dynamic range signal metadata, high-high brightness information output valve of correspondence in electro-optic conversion curve is signal maximum brightness value；Intercepting primitive curve section in the electro-optic conversion curve of high dynamic range signal, the output valve of primitive curve section is from the zero to signal maximum brightness value；If needing the brightness reached is map intensity values, map intensity values is mapping coefficient with the ratio of signal maximum brightness value；In the case of abscissa is constant, makes the vertical coordinate output valve of primitive curve section carry out equal proportion according to mapping coefficient and map formation mapping electro-optic conversion curved section.This processing system includes gamma calling module, dynamic mapping module, Gamma correction module；The problem that this processing method and processing system can solve the problem that HDR signal is overall partially secretly, be unable to reach the brightness that needs reach.
Description
Technical field
The present invention relates to signal processing technology field, particularly relate to processing method and the process of a kind of high dynamic range signal
System.
Background technology
HDR (High-Dynamic Range is called for short HDR) image, compares common image, it is provided that more
Many dynamic ranges and image detail, according to the standard dynamic range (Standard-Dynamic of different time of exposure
Range, be called for short SDR) image, utilize the SDR image of the corresponding optimal details of each time of exposure to synthesize final HDR image,
Can preferably reflect the visual effect in people's true environment.
Gamma (gamma) standard used due to HDR with SDR (standard dynamic range) signal is different, HDR signal
After Gamma requires to carry out according to standards such as SMPTE 2084, HLG (Hybrid Log Gamma logarithm gamma is distributed, and is called for short HLG)
Phase makes, and SDR signal then requires that Gamma2.4 etc. carries out post-production according to Gamma 2.2, and therefore we are reducing
Time, also can reduce according to corresponding Gamma；The LCD screen of Most current is all the screen of SDR, i.e. screen
Gamma standard is Gamma2.2.
For HDR signal, there is multiple standards in existing post production process, after carrying out with SMPTE2084 standard
As a example by phase makes, its high-high brightness there may be a variety of, as a example by 600nit, 1000nit, 4000nit, if directly invoked
The brightness section of SMPTE2084, SMPTE2084 curve output is that 0-10000nit, HDR signal turns through SMPTE2084 curve
After change, the maximum brightness value of output signal is the maximum brightness value that 600nit, 1000nit, 4000nit, only screen can show
6 percent, 1/10th, 4/10ths.The significantly reduction of display brightness, it is impossible to reach the brightness needing to reach, do not have
Give full play to the advantage of HDR signal, cause effect to show and cannot take into account brightness and details in a play not acted out on stage, but told through dialogues details.
Be only used for strengthening the understanding to the background of the present invention in information above-mentioned disclosed in described background section, therefore it
Can include not constituting the information to prior art known to persons of ordinary skill in the art.
Summary of the invention
One main purpose of the present invention is to overcome at least one deficiency of above-mentioned prior art, it is provided that a kind of high dynamic
The processing method of range signal and processing system, in order to solve the problem that HDR signal is unable to reach the brightness that needs reach.
For achieving the above object, the present invention adopts the following technical scheme that
According to an aspect of the invention, it is provided the processing method of a kind of high dynamic range signal,
Obtain the electro-optic conversion curve type of described high dynamic range signal；
Obtaining the high-high brightness information in described high dynamic range signal metadata, described high-high brightness information is at described electricity
Output valve corresponding in light transformation curve is signal maximum brightness value；
Primitive curve section, the output valve of described primitive curve section is intercepted in the electro-optic conversion curve of high dynamic range signal
For from the zero to described signal maximum brightness value；
If needing the brightness value that reaches is map intensity values, the ratio of described map intensity values and described signal maximum brightness value
Value is mapping coefficient；
In the coordinate system of described electro-optic conversion curve, in the case of abscissa is constant, make described primitive curve section
Vertical coordinate output valve carries out equal proportion according to described mapping coefficient and maps formation mapping electro-optic conversion curved section.
According to a further aspect in the invention, it is provided that the processing system of a kind of high dynamic range signal, including:
Gamma calling module, is standard dynamic range signal or HDR for input electrical signal is carried out judgement
Signal, and according to the type standard of described high dynamic range signal, determine that the employing electric light corresponding with described type standard turns
Change curve；
Dynamic mapping module, maps electro-optic conversion curved section, school for being passed through by the described high dynamic range signal of input
Positive gamma curve conversion forms mapping signal；
Gamma correction module, for being increased or reduce the described mapping signal of input conventional screen by control, reaches to make
The output of the screen gamma curve of described conventional screen is identical with the output of the screen gamma curve of standard screen.
As shown from the above technical solution, the present invention provides processing method and the processing system of a kind of high dynamic range signal,
The output valve that the high-high brightness information of the metadata of high dynamic range signal is corresponding in opto-electronic conversion curve is mapped to needs
The brightness value reached, is mapped the high-high brightness information of high dynamic range signal with needing the brightness value reached, and will
Remaining brightness value of high dynamic range signal maps also according to mapping coefficient, makes the brightness of high dynamic range signal and screen
Value preferably cooperates, so that the brightness value after screen shows of high dynamic range signal is significantly carried
Height, shows the display effect of HDR signal truly on screen；Avoiding the brightness at high dynamic range signal is
In the case of 4000nit, 3000nit, 1000nit, 800nit, 300nit etc., it is impossible to the problem reaching to need the brightness reached.
Accompanying drawing explanation
Describing its example embodiment in detail by referring to accompanying drawing, above and other feature of the present invention and advantage will become
Become apparent from.
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 processing method one embodiment in SMPTE 2084 electro-optic conversion curve
Schematic diagram；
Fig. 3 is the schematic diagram of the primitive curve section intercepted from Fig. 2；
Fig. 4 be curved section original in Fig. 3 is mapped after formed map electro-optic conversion curved section schematic diagram；
Fig. 5 is the structural representation of the processing system of the high dynamic range signal of the present invention.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment can be with multiple shape
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, it is provided that these embodiments make the present invention incite somebody to action
Fully and completely, and by the design of example embodiment those skilled in the art is conveyed to all sidedly.
The generation of Gamma stems from the discernible brightness of human eye and the non-linear relation of intrinsic brilliance, and we are at Gamma
The principle of reason be intended to camera acquisition after the most complete embodiment of optical information on screen, make screen light and
The optical information coupling of signal itself；Signal content, after video camera has been recorded, can carry out a series of post-production, right
For the post-production of HDR, use the 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 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 output valve of correspondence in electro-optic conversion curve is signal maximum brightness value；HDR
Signal is a series of signal of telecommunication, as the input signal of electro-optic conversion curve, and the corresponding different output valve of different input values,
The biggest output valve of input value is the biggest, so the high-high brightness information in high dynamic range signal metadata is the maximum signal of telecommunication
Value, output valve corresponding after maximum value of electrical signals input electro-optic conversion curve is the most maximum, and this output valve is signal high-high brightness
Value.
The schematic diagram of SMPTE 2084 electro-optic conversion curve as shown in Figure 2, its abscissa is to represent the height of input dynamically
The information of range signal, scope uses 0-1 to indicate, and for the non-linear value of color that the signal of telecommunication is corresponding, the bit wide of different chips has difference
Different, such as 10bit (0-1023), 12bit (0-4095)；Vertical coordinate is the optical information of screen, and scope is that 0-1 indicates, and it is maximum
The value of value 1 is different according to the value that different electro-optic conversion curve standards is corresponding, with SMPTE 2084 electro-optic conversion curve is
Example, the maximum brightness value of its output is 10000nit.
But, owing to there is multiple standards in the early stage manufacturing process of high dynamic range signal, complete is high dynamic
Range signal as the input signal of electro-optic conversion curve, the signal maximum brightness value that maximum input value is corresponding may be
4000nit, 3000nit, 1000nit, 800nit, 300nit etc.；The present embodiment is as a example by 4000nit.
As it is shown on figure 3, intercept primitive curve section in the electro-optic conversion curve of high dynamic range signal, primitive curve section
Output valve is from the zero to signal maximum brightness value.As a example by the electro-optic conversion curve of the present embodiment thinks SMPTE 2084, at SMPTE
Intercepting primitive curve section in 2084 electro-optic conversion curves, output valve is 0-400nit, can obtain output valve corresponding from figure
Input value is 0-0.9.
As shown in Figure 4, if the maximum brightness value of SMPTE2084 electro-optic conversion curve output is map intensity values, map bright
Angle value is mapping coefficient with the ratio of signal maximum brightness value, and the maximum brightness value of SMPTE2084 electro-optic conversion curve is
10000nit, signal maximum brightness value is 4000nit, so, the mapping coefficient in the present embodiment is 10000/4000=2.5；
In the case of abscissa holding is constant, the vertical coordinate output valve of primitive curve section is made to carry out equal proportion according to mapping coefficient 2.5
Map to be formed and map electro-optic conversion curved section, several numerical value is set forth below and further illustrates mapping relations: the input value of i.e. 0.9 is not
Becoming, output valve is mapped to 10000 from 4000；The input value of 0.75 is constant, output valve from 1000 being mapped to 2500, certain input value
When being 0, output valve is still 0.Generally, needing 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.
Can also map with the mapping method of the present invention for the opto-electronic conversion curve with HLG as standard.
Needing the brightness value reached to be map intensity values, map intensity values exports less than or equal in electro-optic conversion curve
Maximum brightness value；Generally, the maximum brightness value during map intensity values is electro-optic conversion curve.But it is not limited to maximum
Brightness value, map intensity values can also select the numerical value less than the maximum brightness value in electro-optic conversion curve as required.
The output valve that the high-high brightness information of the metadata of high dynamic range signal is corresponding in opto-electronic conversion curve is reflected
It is mapped to the brightness value that screen needs to reach, by the high-high brightness information of high dynamic range signal and the brightness value pair reached with needs
Should get up, and remaining brightness value of high dynamic range signal is mapped also according to mapping coefficient, reach the display needed
Effect；Avoiding the brightness at high dynamic range signal is 4000nit, 3000nit, 1000nit, 800nit, 300nit's etc.
In the case of, it is impossible to the problem being mapped to screen high-high brightness；The output valve that all input values of high dynamic range signal are corresponding obtains
To the expansion of corresponding multiple, make the interval between different input value expand too, thus effect show can take into account brightness with
Details in a play not acted out on stage, but told through dialogues details.
In the case of other situations are the most same as described above, map intensity values can be chosen as required 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 vertical coordinate output valve of primitive curve section according to mapping coefficient
2.25 or 2.375 etc. carry out equal proportion maps to be formed and maps electro-optic conversion curved section.
High dynamic range signal is converted to prestacked data signal, prestacked through above-mentioned mapping electro-optic conversion curved section
Data signal is converted to mapping signal after Gamma1/2.2 curve, using mapping signal as the screen gamma of SDR screen
The input value of curve.Gammate curve herein is Gamma1/2.2 curve, but is not limited to Gamma1/2.2 curve, it is possible to
For curves such as Gamma1/2.0.Gammate curve needs corresponding with screen gamma curve, because gammate curve needs
Ultimately form the curve of a Gamma1.0 after superposing with screen gamma curve, but during reality is debugged, some is indivedual
There is deviation in point, and causing whole piece curve is not the Gamma1.0 of standard, thus herein the purpose of gammate curve mainly with
After screen gamma curve superposition, mapping electro-optic conversion curved section is made not affected by screen gamma curve.
Prestacked data signal inputs the screen gamma curve of SDR screen, phase after Gamma1/2.2 Curve transform
When in prestacked data signal having been carried out a post-production so that it is meet the reduction criterion of SDR screen, thus solve height
The problem that dynamic range signal carries out showing on common SDR screen.
Owing to the gamma value of different screen differs greatly, it is not to set according to the Gamma 2.2 of standard, therefore needs
Screen Gamma2.2 is corrected.If the gamma value of the SDR screen detected is detection gamma value, by standard Gamma2.2
Curve is as the standard gamma value of standard SDR screen；Relatively detection gamma value and the size of standard gamma value, increased by control
Or reduce the mapping signal inputting SDR screen, reach the output making the Gamma2.2 curve of SDR screen and standard SDR screen
The output of Gamma2.2 curve identical.Owing to the gamma value of SDR screen is changeless, thus only defeated by changing
Enter the size of value to change the size of output valve, i.e. the size by changing mapping signal reaches to make SDR screen
The output of Gamma2.2 curve is identical with the output of the Gamma2.2 curve of standard SDR screen.Conventional screen choosing herein
Being selected as SDR screen, standard screen is standard SDR screen；Conventional screen is the product of the necessary being used in production, life
Product, and standard screen is non-existent, is conventional screen production standard, are the conventional screen standards that need to reach.
The output identical with the Gamma2.2 curve of standard SDR screen by the Gamma2.2 curve of SDR screen so that it is
Gamma1.0 curve is become with Gamma1/2.2 after superposing；It is thus possible to ensure that the mapping electro-optic conversion curve of HDR passes through
In equal proportion transition after Gamma1.0, the EOTF of HDR will not be impacted, it is possible to avoid the transition of luminance point to go wrong,
It is not result in that brightness is on the low side, or brightness is higher and causes some scenes saturated.
Employing SDR screen is as conventional screen herein, but conventional screen is not limited to SDR screen, can be any permissible
Screen for display.The screen gamma curve of SDR screen is screen Gamma2.2 curve, so to select and screen
The corresponding Gamma1/2.2 curve of Gamma2.2 curve is 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 output valve of correspondence 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, the corresponding different output valve of different input values, the biggest output valve of input value is also
The biggest, so the high-high brightness information in high dynamic range signal metadata is maximum value of electrical signals, maximum value of electrical signals
Output valve corresponding after input electro-optic conversion curve is the most maximum, and this output valve is signal maximum brightness value.
The schematic diagram of SMPTE 2084 electro-optic conversion curve as shown in Figure 2, its abscissa is to represent the height of input dynamically
The information of range signal, scope uses 0-1 to indicate, and for the non-linear value of color that the signal of telecommunication is corresponding, the bit wide of different chips has difference
Different, such as 10bit (0-1023), 12bit (0-4095)；Vertical coordinate is the optical information of screen, and scope is that 0-1 indicates, and it is maximum
The value of value 1 is different according to the value that different electro-optic conversion curve standards is corresponding, with SMPTE 2084 electro-optic conversion curve is
Example, the maximum brightness value of its output is 10000nit.Such as:
But, owing to there is multiple standards in the early stage manufacturing process of high dynamic range signal, complete is high dynamic
Range signal as the input signal of electro-optic conversion curve, the signal maximum brightness value that maximum input value is corresponding may be
4000nit, 3000nit, 1000nit, 800nit, 300nit etc.；The present embodiment is as a example by 4000nit.
As it is shown on figure 3, intercept primitive curve section in the electro-optic conversion curve of high dynamic range signal, primitive curve section
Output valve is from the zero to signal maximum brightness value.As a example by the electro-optic conversion curve of the present embodiment is SMPTE 2084, at SMPTE
Intercepting primitive curve section in 2084 electro-optic conversion curves, output valve is 0-400nit, can obtain output valve corresponding from figure
Input value is 0-0.9.As shown in Figure 4, if the maximum brightness value of SMPTE2084 electro-optic conversion curve output is map intensity values,
Map intensity values is mapping coefficient with the ratio of signal maximum brightness value, the maximum brightness value of SMPTE2084 electro-optic conversion curve
For 10000nit, signal maximum brightness value is 4000nit, so, the mapping coefficient in the present embodiment is 10000/4000=
2.5；In the case of abscissa holding is constant, the vertical coordinate output valve of primitive curve section is made to carry out according to mapping coefficient 2.5
Ratio maps to be formed and maps electro-optic conversion curved section, several numerical value is set forth below and further illustrates mapping relations: the input of i.e. 0.9
Being worth constant, output valve is mapped to 10000 from 4000；The input value of 0.75 is constant, output valve from 1000 being mapped to 2500, the most defeated
Entering output valve when value is 0 is still 0.Generally, needing the brightness value reached can be that electro-optic conversion curve exports
Big brightness value, but it is not limited to maximum brightness value.Can also reflecting by the present invention for the opto-electronic conversion curve with HLG as standard
Shooting method maps.
Needing the brightness value reached to be map intensity values, map intensity values is less than or equal in electro-optic conversion curve
Big brightness value；Generally, the maximum brightness value during map intensity values is electro-optic conversion curve.But it is not limited to high-high brightness
Value, map intensity values can also select the numerical value less than the maximum brightness value in electro-optic conversion curve as required.
The output valve that the high-high brightness information of the metadata of high dynamic range signal is corresponding in opto-electronic conversion curve is reflected
It is mapped to the brightness value that screen needs to reach, by the high-high brightness information of high dynamic range signal and the brightness value pair reached with needs
Should get up, and remaining brightness value of high dynamic range signal is mapped also according to mapping coefficient, reach the display needed
Effect；Avoiding the brightness at high dynamic range signal is 4000nit, 3000nit, 1000nit, 800nit, 300nit's etc.
In the case of, it is impossible to the problem being mapped to screen high-high brightness；The output valve that all input values of high dynamic range signal are corresponding obtains
To the expansion of corresponding multiple, make the interval between different input value expand too, thus effect show can take into account brightness with
Details in a play not acted out on stage, but told through dialogues details.In the case of other situations are the most same as described above, map intensity values can be chosen as required 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 vertical coordinate output valve of primitive curve section according to mapping coefficient
2.25,2.375 etc. carry out equal proportion and map to be formed and map electro-optic conversion curved section.
It is prestacked data signal by high dynamic range signal through Gamma1/2.2 Curve transform, prestacked data signal
Mapping signal is converted to, using mapping signal as the screen gamma of SDR screen after above-mentioned mapping electro-optic conversion curved section
The input value of curve.Gammate curve herein is Gamma1/2.2 curve, but is not limited to Gamma1/2.2 curve, it is possible to
For curves such as Gamma1/2.0.Gammate curve needs corresponding with screen gamma curve, because gammate curve needs
Ultimately form the curve of a Gamma1.0 after superposing with screen gamma curve, but during reality is debugged, some is indivedual
There is deviation in point, and causing whole piece curve is not the Gamma1.0 of standard, thus herein the purpose of gammate curve mainly with
After screen gamma curve superposition, mapping electro-optic conversion curved section is made not affected by screen gamma curve.
By high dynamic range signal through Gamma1/2.2 Curve transform, be equivalent to prestacked data signal has been carried out one
Secondary post-production so that it is meet the reduction criterion of SDR screen, thus solve high dynamic range signal on common SDR screen
The problem carrying out showing.
Owing to the gamma value of different screen differs greatly, it is not to set according to the Gamma 2.2 of standard, therefore needs
Screen Gamma2.2 is corrected.If the gamma value of the SDR screen detected is detection gamma value, by standard Gamma2.2
Curve is as the standard gamma value of standard SDR screen；Relatively detection gamma value and the size of standard gamma value, increased by control
Or reduce the mapping signal inputting SDR screen, reach the output making the Gamma2.2 curve of SDR screen and standard SDR screen
The output of Gamma2.2 curve identical.Owing to the gamma value of SDR screen is changeless, thus only defeated by changing
Enter the size of value to change the size of output valve, i.e. the size by changing mapping signal reaches to make SDR screen
The output of Gamma2.2 curve is identical with the output of the Gamma2.2 curve of standard SDR screen.Conventional screen choosing herein
Being selected as SDR screen, standard screen is standard SDR screen；Conventional screen is the product of the necessary being used in production, life
Product, and standard screen is non-existent, is conventional screen production standard, are the conventional screen standards that need to reach.
Output phase by the output of the Gamma2.2 curve of SDR screen with the Gamma2.2 curve of standard SDR screen
With so that it is become Gamma1.0 curve with Gamma1/2.2 after superposing；It is thus possible to ensure that the mapping electro-optic conversion curve of HDR passes through
In equal proportion transition after Gamma1.0, the EOTF of HDR will not be impacted, it is possible to avoid the transition of luminance point to go wrong,
It is not result in that brightness is on the low side, or brightness is higher and causes some scenes saturated.
Employing SDR screen is as conventional screen herein, but conventional screen is not limited to SDR screen, can be any permissible
Screen for display.The screen gamma curve of SDR screen is screen Gamma2.2 curve, so to select and screen
The corresponding Gamma1/2.2 curve of Gamma2.2 curve is as gammate curve.
In above-described embodiment one and embodiment two, being required to the signal of telecommunication of input is carried out judgement is standard dynamic range
Signal or high dynamic range signal.It is to intercept before primitive curve section by gamma calling module input telecommunications in the present invention
Number carry out judging.Because if being that standard dynamic range signal can directly show on SDR screen.
In above-described embodiment one and embodiment two, after the signal of telecommunication determining input is high dynamic range signal, it is both needed to
To determine use the electro-optic conversion curve corresponding with type standard according to the type standard of high dynamic range signal.Height is moved
For state range signal, can have the type standards such as SMPTE ST2084 or HLG, the type of electro-optic conversion (OETF) curve need with
SMPTE ST2084 electro-optic conversion curve that the type standards such as SMPTE ST2084 or HLG are corresponding or HLG electro-optic conversion curve
Deng.
Embodiment three:
As it is shown in figure 5, embodiments provide the processing method phase of a kind of and above-mentioned a kind of high dynamic range signal
Corresponding processing system includes: gamma calling module, dynamic mapping module, Gamma correction module.
Gamma calling module, is standard dynamic range signal or HDR for input electrical signal is carried out judgement
Signal, and according to the type standard of described high dynamic range signal, determine that the employing electric light corresponding with described type standard turns
Change curve.
Dynamic mapping module, maps electro-optic conversion curved section, Gamma1/ for being passed through by the high dynamic range signal of input
2.2 Curve transforms form mapping signal.
Gamma correction module, for being increased or reduce the mapping signal of input SDR screen by control, reaches to make SDR screen
The output of the Gamma2.2 curve of curtain is identical with the output of the Gamma2.2 curve of standard SDR screen.
The forming process of above-mentioned mapping electro-optic conversion curved section is as follows:
Obtain the electro-optic conversion curve type of described high dynamic range signal；
Obtaining the high-high brightness information in described high dynamic range signal metadata, described high-high brightness information is at described electricity
Output valve corresponding in light transformation curve is signal maximum brightness value；
In the electro-optic conversion curve of high dynamic range signal intercept primitive curve section, the output valve of primitive curve section be from
Zero arrives described signal maximum brightness value.
If needing the brightness value reached is map intensity values, map intensity values is mapping with the ratio of signal maximum brightness value
Coefficient.
In the coordinate system of electro-optic conversion curve, in the case of abscissa is constant, the vertical coordinate making primitive curve section is defeated
Go out value and carry out equal proportion mapping formation mapping electro-optic conversion curved section according to mapping coefficient.
It should be appreciated that the present invention is not limited in its application to detailed step and the flow process of the method that this specification proposes
Mode.The present invention can have other embodiments, and can realize in many ways and perform.Aforesaid deformation form and
Modification falls within the scope of the present invention.It should be appreciated that the present invention of this disclosure and restriction extends in literary composition
And/or accompanying drawing is mentioned or all alternative combination of obvious two or more independent features.All these different
Combination constitutes the multiple alternative aspect of the present invention.Embodiment described in this specification illustrates to become known for realizing the present invention
Best mode, and those skilled in the art will be enable to utilize the present invention.
Claims (9)
1. the processing method of a high dynamic range signal, it is characterised in that
Obtain the electro-optic conversion curve type of described high dynamic range signal；
Obtaining the high-high brightness information in described high dynamic range signal metadata, described high-high brightness information turns at described electric light
Changing output valve corresponding in curve is signal maximum brightness value；
In the electro-optic conversion curve of high dynamic range signal intercept primitive curve section, the output valve of described primitive curve section be from
Zero arrives described signal maximum brightness value；
If needing the brightness value reached is map intensity values, described map intensity values with the ratio of described signal maximum brightness value is
Mapping coefficient；
In the coordinate system of described electro-optic conversion curve, in the case of abscissa is constant, make the vertical seat of described primitive curve section
Mark output valve carries out equal proportion according to described mapping coefficient and maps formation mapping electro-optic conversion curved section.
The processing method of a kind of high dynamic range signal the most according to claim 1, it is characterised in that described mapped luminance
Value is less than or equal to the maximum brightness value of output in described electro-optic conversion curve.
The processing method of a kind of high dynamic range signal the most according to claim 1, it is characterised in that by dynamic for described height
Range signal is converted to prestacked data signal through described mapping electro-optic conversion curved section, and described prestacked data signal is passed through
Mapping signal is converted to, using described mapping signal as the input of the screen gamma curve of conventional screen after gammate curve
Value, described gammate curve is corresponding with described screen gamma curve.
The processing method of a kind of high dynamic range signal the most according to claim 1, it is characterised in that by dynamic for described height
The corrected gamma curve of range signal is converted to prestacked data signal, and described prestacked data signal maps electricity through described
Mapping signal is converted to, using described mapping signal as the input of the screen gamma curve of conventional screen after light transformation curve section
Value, described gammate curve is corresponding with described screen gamma curve.
5. according to the processing method of a kind of high dynamic range signal described in claim 3 or 4, it is characterised in that set and detect
Described conventional screen screen gamma value for detection gamma value, the screen gamma value of standard screen is standard gamma value；Relatively
Described detection gamma value and the size of described standard gamma value, increased by control or reduce described in the described conventional screen of input
Mapping signal, reaches the defeated of the output making the screen gamma curve of described conventional screen and the screen gamma curve of standard screen
Output is identical.
The processing method of a kind of high dynamic range signal the most according to claim 1, it is characterised in that described former intercepting
By gamma calling module, input electrical signal carrying out judgement before beginning curved section is standard dynamic range signal or described height moves
State range signal, and the type of described high dynamic range signal.
The processing method of a kind of high dynamic range signal the most according to claim 1, it is characterised in that move according to described height
The type standard of state range signal, determines and uses the described electro-optic conversion curve corresponding with described type standard.
8. the processing system of a high dynamic range signal, it is characterised in that including:
Gamma calling module, is standard dynamic range signal or HDR letter for input electrical signal carries out judgement
Number, and according to the type standard of described high dynamic range signal, determine and use the electro-optic conversion corresponding with described type standard
Curve；
Dynamic mapping module, maps electro-optic conversion curved section, correction gal for being passed through by the described high dynamic range signal of input
Agate Curve transform forms mapping signal；
Gamma correction module, for being increased or reduce the described mapping signal of input conventional screen by control, reach to make described in
The output of the screen gamma curve of conventional screen is identical with the output of the screen gamma curve of standard screen.
The processing system of a kind of high dynamic range signal the most according to claim 8, it is characterised in that described mapping electric light
The forming process of transformation curve section is as follows:
Obtain the electro-optic conversion curve type of described high dynamic range signal；
Obtaining the high-high brightness information in described high dynamic range signal metadata, described high-high brightness information turns at described electric light
Changing output valve corresponding in curve is signal maximum brightness value；
Primitive curve section, the output valve of described primitive curve section is intercepted in the electro-optic conversion curve of described high dynamic range signal
For from the zero to described signal maximum brightness value；
If needing the brightness that reaches is map intensity values, the ratio of described map intensity values and described signal maximum brightness value is for reflecting
Penetrate coefficient；
In the coordinate system of described electro-optic conversion curve, in the case of abscissa is constant, make the vertical seat of described primitive curve section
Mark output valve carries out equal proportion according to described mapping coefficient and maps the described mapping electro-optic conversion curved section of formation.
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