CN109274985A - Video transcoding method, device, computer equipment and storage medium - Google Patents
Video transcoding method, device, computer equipment and storage medium Download PDFInfo
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234309—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo
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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
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440218—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4
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Abstract
The application provides a kind of video transcoding method, device, computer equipment and storage medium, and wherein method includes: to obtain video to be transcoded, and the video format of video to be transcoded is standard dynamic range SDR；The source space of video to be transcoded is mapped to linear RGB space, obtains the first video；By the space reflection of the first video to the space HSI, the local colour gamut of S in the space HSI is extended into target color gamut, by the HSI space reflection after expansion to linear RGB space；The brightness domain of first video is extended into object brightness domain；Target color gamut and object brightness domain determine that the video format of target video is high dynamic range HDR according to the video format of target video；By the space reflection of the first video after expansion to source space, target video is obtained.The method achieve being HDR video by SDR Video Quality Metric, so that user can watch the HDR effect of SDR video, greatly improve viewing effect in the equipment for supporting HDR.
Description
Technical field
This application involves technical field of video processing more particularly to a kind of video transcoding method, device, computer equipment and
Storage medium.
Background technique
With the development of video technique, many Video format standards with their own characteristics have been emerged in large numbers in the market, for example, standard is dynamic
State range (Standard Dynamic Range, abbreviation SDR), high dynamic range (High-Dynamic Range, HDR).
Wherein, the ratio SDR of HDR format is rich in color.
The video format of the overwhelming majority is SDR format at present, but on video playback apparatus, is played and regarded with SDR format
Frequently, viewing can be made ineffective.
Summary of the invention
The application provides a kind of video transcoding method, device, computer equipment and storage medium in fact, for solving related skill
In art, video is played with SDR format, viewing can be made ineffective.
The application one side embodiment proposes a kind of video transcoding method, comprising:
Obtain video to be transcoded；The video format of the video to be transcoded is standard dynamic range SDR；
The source space of the video to be transcoded is mapped to linear RGB space, obtains the first video；
By the space reflection of first video to the space HSI, the local colour gamut of S in the space HSI is extended into aim colour
Domain, by the HSI space reflection after expansion to linear RGB space；
The brightness domain of first video is extended into object brightness domain；The target color gamut and object brightness domain root
It is determined according to the video format of target video, the video format of the target video is high dynamic range HDR；
By the space reflection of the first video after expansion to the source space, the target video is obtained.
Video transcoding method provided by the embodiments of the present application, by obtaining video to be transcoded, then by video to be transcoded
Source space is mapped to linear RGB space, obtains the first video, later by the space reflection of the first video to the space HSI, by HSI
The local colour gamut of S extends to target color gamut in space, by the HSI space reflection after expansion to linear RGB space, and by first
The brightness domain of video extends to object brightness domain, then the space reflection of the first video after expansion is obtained target to source space
Video.As a result, by the way that video to be transcoded is mapped to linear RGB space by source space after, carry out colour gamut expansion and brightness domain
Expand, then the first video after expansion be mapped to source space by linear RGB space, obtain HDR video, thus realize by
SDR Video Quality Metric is HDR video, so that user can watch the HDR effect of SDR video, greatly in the equipment for supporting HDR
Viewing effect is improved greatly.
The application another aspect embodiment proposes a kind of video code conversion device, comprising:
Module is obtained, for obtaining video to be transcoded；The video format of the video to be transcoded is standard dynamic range
SDR；
Mapping block obtains the first video for the source space of the video to be transcoded to be mapped to linear RGB space；
Enlargement module, for by the space reflection of first video to the space HSI, by the local colour gamut of S in the space HSI
Target color gamut is extended to, by the HSI space reflection after expansion to linear RGB space；
The enlargement module is also used to the brightness domain of first video extending to object brightness domain；The aim colour
Domain and the object brightness domain determine that the video format of the target video is high dynamic according to the video format of target video
Range HDR；
The mapping block, the space reflection of the first video after being also used to expand obtain described to the source space
Target video.
Video code conversion device provided by the embodiments of the present application, by obtaining video to be transcoded, then by video to be transcoded
Source space is mapped to linear RGB space, obtains the first video, later by the space reflection of the first video to the space HSI, by HSI
The local colour gamut of S extends to target color gamut in space, by the HSI space reflection after expansion to linear RGB space, and by first
The brightness domain of video extends to object brightness domain, then the space reflection of the first video after expansion is obtained target to source space
Video.As a result, by the way that video to be transcoded is mapped to linear RGB space by source space after, carry out colour gamut expansion and brightness domain
Expand, then the first video after expansion be mapped to source space by linear RGB space, obtain HDR video, thus realize by
SDR Video Quality Metric is HDR video, so that user can watch the HDR effect of SDR video, greatly in the equipment for supporting HDR
Viewing effect is improved greatly.
The application another aspect embodiment proposes a kind of computer equipment, including memory, processor and is stored in
On reservoir and when processor described in the computer program that can run on a processor executes described program, such as above-mentioned implementation is realized
Video transcoding method described in example.
The application another aspect embodiment proposes a kind of non-transitorycomputer readable storage medium, is stored thereon with calculating
Machine program realizes the video transcoding method as described in above-described embodiment when the program is executed by processor.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application.
Fig. 1 is a kind of flow diagram of video transcoding method provided by the embodiments of the present application；
Fig. 2 is the flow diagram of another video transcoding method provided by the embodiments of the present application；
Fig. 3 is the flow diagram of another video transcoding method provided by the embodiments of the present application；
Fig. 4 is a kind of structural schematic diagram of video code conversion device provided by the embodiments of the present application；
Fig. 5 shows the block diagram for being suitable for the exemplary computer device for being used to realize the application embodiment.
Through the above attached drawings, it has been shown that the specific embodiment of the application will be hereinafter described in more detail.These attached drawings
It is not intended to limit the range of the application design in any manner with verbal description, but by referring to specific embodiments
Illustrate the concept of the application for those skilled in the art.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary is implemented
Embodiment described in example does not represent all embodiments consistent with the application.On the contrary, they are only and such as institute
The example of the consistent device and method of some aspects be described in detail in attached claims, the application.
Below with reference to the accompanying drawings the video transcoding method, device, computer equipment and storage medium of the embodiment of the present application are described.
With the development of terminal technology, support the equipment of HDR more and more at present, and most of videos are SDR lattice at present
Formula will affect viewing effect if playing video with SDR format.For this problem, the embodiment of the present application proposes a kind of video
Code-transferring method.
The video transcoding method of the embodiment of the present application, by the way that video to be transcoded is mapped to linear RGB space by source space
Afterwards, it carries out colour gamut expansion and brightness domain expands, then the first video after expansion is mapped to source space by linear RGB space,
HDR video is obtained, so that realizing SDR Video Quality Metric is HDR video, so that user is in the equipment for supporting HDR, it can be with
The HDR effect for watching SDR video, greatly improves viewing effect.
Fig. 1 is a kind of flow diagram of video transcoding method provided by the embodiments of the present application.
Video transcoding method in the present embodiment can be realized that video code conversion device is specifically as follows by video code conversion device
The software installed in hardware device or hardware device.Hardware device is for example, mobile terminal, server etc..
As shown in Figure 1, above-mentioned video transcoding method may comprise steps of:
Step 101, video to be transcoded is obtained；The video format of video to be transcoded is standard dynamic range SDR.
In the related technology, SDR is standard dynamic range image, and HDR is high dynamic range images, therefore HDR video ratio
SDR video has wider array of colour gamut, and color is more abundant, therefore the view for being SDR by video format is proposed in the embodiment of the present application
Frequency is converted to HDR format, so that viewing better effect.
In the present embodiment, using the video that video format is SDR format as video to be transcoded.
Step 102, the source space of video to be transcoded is mapped to linear RGB space, obtains the first video.
Color is usually described with three independent attributes, and three independent variable comprehensive functions constitute a space coordinate,
Here it is spaces.But color object being described itself is objectively, and different spaces are only gone to measure same from different angles
A object.
In the present embodiment, source space can be yuv space.YUV is a kind of colour coding method, be a kind of color, show the score from
Space, wherein " Y " indicates brightness, and " U " and " V " is then coloration, concentration.And rgb space be it is blue using physics three primary colours,
Green, red expression, is primary color space.
In practical applications, yuv space is generallyd use when transmitting video, SDR video to be transcoded is YUV in the present embodiment
Space.Expand for the ease of the subsequent colour gamut to the first video and brightness domain, it can be first by the yuv space of video to be transcoded
It is mapped to linear RGB space, obtains the first video.Since colour gamut expansion is carried out in the space HSI, brightness domain expands in RGB
What space carried out, if yuv space is mapped directly to the space HSI, then colour gamut expansion can only be carried out first, re-map later
Rgb space carries out brightness domain expansion.Therefore, in the present embodiment, SDR video to be transcoded is first mapped to linear RGB space, it
If first carrying out brightness domain expansion afterwards, directly carry out, the space HSI is re-mapped after carrying out brightness domain expansion and carries out colour gamut expansion
It fills；If first carry out colour gamut expansion, first by linear RGB space be mapped to the space HSI carry out colour gamut expansion, colour gamut expand after by
HSI space reflection carries out brightness domain expansion to linear RGB.
Step 103, by the space reflection of the first video to the space HSI, the local colour gamut of S in the space HSI is extended into mesh
Colour gamut is marked, by the HSI space reflection after expansion to linear RGB space.
The space HSI reflects the mode of the vision system perception colour of people, substantially special with three kinds of tone, saturation degree and intensity
Sign amount perceives color.I.e. the space HSI is to describe color characteristics with tri- parameter of H, S, I, and wherein H defines the wavelength of color, is claimed
For tone；S indicates gradation of color, referred to as saturation degree；I indicates intensity or brightness.
Due to the visual characteristic of HSI spatial adaptation people, in the present embodiment, the linear RGB space of the first video is mapped to
Behind the space HSI, then color domain is expanded.
Specifically, after obtaining the first video, the linear space of the first video is mapped to the space HSI, later by HSI sky
Between the local colour gamut of middle S extend to target color gamut, then by the HSI space reflection after expansion to linear RGB space.
Wherein, target color gamut is determined according to the format of target video, wherein the format of target video is HDR.With
For HDR10, target color gamut can be full colour gamut, 80 percent colour gamut etc..
In specific implementation, the linear RGB space of the first video first can be mapped to XYZ space, using XYZ space as
Bridge, such as according to BT2020 chromaticity coordinate, is mapped to the space HSI later by XYZ space according to the chromaticity coordinate of target video.
Wherein, BT2020 is the Next Generation ultra high-definition UHD that International Telecommunication Union's Radiocommunication Sector (ITU-R) is promulgated
The standard of (Ultra-high definition) video production and display system.
After by the space reflection of the first video to the space HSI, for the S in the space HSI, chromatic value highest in S is obtained
Local colour gamut local colour gamut is extended into target color gamut and using linearly drawing high algorithm or according to pre-programmed curve, and H color
Adjustment appropriate can be carried out according to artificial default or preanalysis by adjusting, and I can be remained unchanged.
Wherein, linear stretch algorithm refers to for each chromatic value in local colour gamut, multiplied by fixed multiple, is expanded
Chromatic value after filling.That is, the corresponding fixed multiple of each chromatic value is identical.And colour gamut expansion is carried out according to pre-programmed curve
It fills and refers to that the corresponding fixed multiple of each chromatic value is different.
For example, by taking the first video as an example, the corresponding chromatic value of each pixel in the first video.For each pixel
Point, when the corresponding chromatic value of pixel is located in top10%, then use linearly draws high algorithm and is expanded, if corresponding color
Angle value is not located in top10%, then without expanding.Wherein, top10% refers to chromatic value in the first video all pixels point
Range where highest 10%.Here, local colour gamut refers to the chromatic value composition being located in top10% in the first video
Set.
In the present embodiment, the linear RGB space of the first video is transformed into the space HSI, by the local color of S in the space HSI
Domain extends to target color gamut, can expand the colour gamut of the first video, increases the color of video.
Step 104, the brightness domain of the first video is extended into object brightness domain.
Wherein, object brightness domain is determined according to the format HDR of target video.By taking HDR10 as an example, object brightness domain
For [0,10000] nit, wherein nit (nit) is the unit of brightness, is the luminous intensity of unit area, be indicate eyes from
The intensity of the seen object reflected light of a direction.
And the brightness domain of SDR is [0,100] nit, since the brightness domain of SDR is up to 100nit, the brightness domain of HDR10 is most
The brightness of greatly 10000nit, SDR are a kind of relative luminances, and the brightness that HDR is indicated is absolute brightness, it is therefore desirable to 100nit
SDR brightness domain be mapped to HDR brightness domain.
Since the image detail of the wider offer of brightness domain is more, in the present embodiment, the brightness domain of the first video can be carried out
Expand.As a kind of possible implementation, default index and corresponding exponential function can be used, by the bright of the first video
Degree domain extends to object brightness domain.Wherein, exponential function such as formula (1), (2), (3) are shown.
Y=a × xr (1)
Wherein, y is the target brightness value after expanding, and x is the brightness value before expanding, and a is coefficient, and r is default index, example
Such as, r=1.68.
Y=a sin x γ+β (2)
Wherein, y is the target brightness value after expanding, and x is the brightness value before expanding, and a indicates that coefficient, γ indicate default and refer to
Number, β is constant.
Wherein, y is the target brightness value after expanding, and x is the brightness value before expanding, and α, μ are coefficient, and β, ω are constant, γ
Indicate that default index, θ, σ are coefficient.
Further, before utilization index function expands brightness domain, can according to the brightness value of each pixel,
Initial default index is adjusted.
Specifically, the brightness value of each pixel in the first video can be obtained, to the brightness value of each pixel, according to
Initial default index is adjusted.For example, initial preset index is 1.68, brightness value is ranked up from high to low, and selects
It takes preceding 10% brightness value and is averaged, default index is adjusted according to average value.Wherein, average value is smaller, adjusted pre-
If index is smaller.Since average value is smaller to indicate that the dark portion region in video is larger, and luminance area is smaller, if default index mistake
Greatly, dark bright difference can be obvious, so average value is smaller, default index adjusted is smaller.
After having adjusted default index, according to default index adjusted and corresponding exponential function, to brightness domain into
Row expands.
Step 105, the space reflection of the first video after expansion is obtained into target video to source space.
After carrying out colour gamut expansion and brightness domain expansion to the first video, the space of the first video is linear RGB space, is
By the first Video Quality Metric at the video format that can be played, linear RGB space by the first video is needed to be mapped to source sky
Between, to obtain target video of the video format as HDR format.To realize the source video of SDR format being converted to HDR lattice
The target video of formula.
Specifically, first map the linear RGB space of the first video according to PQ curve as defined in target video,
It is mapped according to PQ curve as defined in HDR format, obtains the space linear R GB, in specific implementation, HDR mark can be used
Formula defined in standard.Then, by linear R GB space reflection to source space, the target video of HDR format is obtained.
The video transcoding method of the embodiment of the present application, it is empty by the way that the video of SDR format is mapped to linear RGB by source space
Between after, carry out that colour gamut expands and brightness domain expands, then linear RGB space be mapped to source space, obtain the target of HDR format
Video, so that realizing the Video Quality Metric of SDR format is HDR, so that user can watch SDR video in HDR equipment
HDR effect, improve viewing experience.
On the basis of the above embodiments, above-mentioned that source space to be transcoded is mapped to linear RGB space, obtain the first view
Frequently, it can be realized by mode shown in Fig. 2.Fig. 2 is the process of another video transcoding method provided by the embodiments of the present application
Schematic diagram.
As shown in Fig. 2, source space to be transcoded, which is mapped to linear RGB space, can comprise the following steps that
Step 201, the source space of video to be transcoded is mapped to the space linear R GB.
In practical applications, when source space is yuv space, can according to the different specification of SDR format (such as BT709,
BT601 etc.) yuv space that defines to the conversion formula in the space linear R GB, is transformed into the yuv space of video to be transcoded non-
In linear RGB space.
Step 202, the space linear R GB for treating transcoded video is normalized, the linear R GB after being normalized
Space.
For the needs of precision and expansion, can the space linear R GB be normalized, the Nonlinear Space after being normalized
Between.
For example, SDR format video uses 8bit locating depth, i.e., each Color Channel is quantified using 8bit, is being returned
It, can be by the R value, G value and B value of each pixel divided by 255, thus by the linear R GB spatial normalization of 8bits when one change
To the floating-point domain of [0,1].Wherein, 1 maximum brightness is indicated, 0 indicates minimum brightness.
Step 203, by the linear R GB space reflection after normalization to linear RGB space, the first video is obtained.
Since, using the space linear R GB, the space linear R GB half-light region is big in transmission of video, then in dark
The quantity of the pixel in light region is more, due to each pixel occupy the position bit it is identical, then half-light region distribution always
Bit becomes more.In order to make rgb space feed back true brightness value, need linear R GB being mapped to linear RGB space.
In specific implementation, the inverse function that OETF defined in BT709 can be used, will be non-after video to be transcoded normalization
Linear RGB space maps to linear RGB space, obtains the first video.
The video transcoding method of the embodiment of the present application will be into after video to be transcoded is mapped to the space linear R GB
Row normalization, and by the linear R GB space reflection after normalization to linear RGB space, the first video is obtained, in order to rear
It is continuous to carry out colour gamut and brightness domain expansion.
Above-mentioned is to re-map the space HSI after linear RGB space is mapped to XYZ space when carrying out colour gamut expansion,
Colour gamut expansion is carried out by S.
As the alternatively possible implementation that colour gamut expands, the linear RGB space of the first video can be mapped to
The space CIELAB.Wherein, the space CIELAB is uniform space, and so-called is uniformly the sense organ of people when numerical value even variation
It is even variation.The space CIELAB includes three parameter L*、a*And b*, wherein L*Indicate colour brightness (L*=0 instruction black,
L*=100 instruction whites), a*Indicate the position (a of red/between magenta and green*Green is indicated for negative value, and positive value refers to
Show magenta), b*Indicate the position (b between yellow and blue*Blue is indicated for negative value, and on the occasion of instruction yellow).
It in actual use, can be first by linear RGB space elder generation since rgb space cannot be converted directly into the space CIELAB
XYZ space is converted to, the space CIELAB is then mapped to by XYZ space again.
It is after linear RGB space is mapped to the space CIELAB, the numerical value of dimension each in the space CIELAB is highest
Local colour gamut extends to corresponding target color gamut.Specifically, being by L*、a*And b*The highest local colour gamut of numerical value extend to
Corresponding target color gamut.To realize the colour gamut expansion to the first video.
In above-described embodiment, the brightness domain of the first video is expanded using default index and corresponding exponential function
Later, tinge may be will appear in the part of image high brightness, this is mainly caused by adjacent brightness value difference is excessive.
It, can be for each pixel in the first video, by the brightness value of pixel in order to avoid tinge influences HDR effect
With the difference of the brightness value of neighbor pixel, it is compared with preset difference value threshold value.When the brightness of pixel and neighbor pixel
When the difference of value is greater than preset difference value threshold value, illustrates that the brightness value difference of the pixel and neighbor pixel is excessive, filter can be used
Wave device is filtered pixel, and the difference between smooth pixel point and neighbor pixel avoids the occurrence of tinge.
Wherein, filter includes 8 coefficients, and the value of 8 coefficients can be determined according to the type of filter.For example, using filter
Wave device: { -1,4, -11,40,40, -11,4, -1 } are filtered pixel.It is remaining that 8 coefficient values of the filter, which are types,
Coefficient value when string filters.
It is taken as the example that filter is filtered pixel, current pixel point can be directed to, obtain transverse direction side
The brightness value of 4 pixels on the upward current pixel point left side and the brightness value of 4 pixels on the right of current pixel point, will
The weighted sum corresponding with 8 coefficients of filter of the brightness value of this 8 pixels in transverse direction from left to right, is worked as
The brightness value of preceding pixel point.Then, the 4 pixel brightness values and current picture on longitudinal direction above current pixel point are obtained
The brightness value of 4 pixels below vegetarian refreshments, by the brightness value of this 8 pixels on longitudinal direction from top to bottom and filtering
8 coefficients of device correspond to weighted sum, obtain the brightness value of current pixel point.Later, seek transverse direction calculated result and
The average value of calculated result on longitudinal direction, using average value as the brightness value of current pixel point, with smooth current pixel point
Luminance difference between neighbor pixel.
It is understood that longitudinal direction can also be calculated first, then transverse direction is calculated, this present embodiment is not limited
It is fixed.
Furthermore, in order to improve the HDR effect of video, in utilization index function and default index, by the first video
Brightness domain extend to object brightness domain after, each image block in image can be also finely adjusted.Fig. 3 is the application implementation
The flow diagram for another video transcoding method that example provides.
It is above-mentioned to use default index and corresponding exponential function, the brightness domain of the first video is extended into object brightness domain
Later, as shown in figure 3, video transcoding method further include:
Step 301, for each image in the first video, multiple images block is divided an image into.
It is made of due to video image one by one, in the present embodiment, for each image in the first video,
Each image is divided into multiple images block.For example, dividing an image into the image block of 3*3, the area of each image block is identical.
Step 302, for image block, according to the difference of the brightness value between image block and adjacent image block, to default finger
Number is adjusted.
It, can be according to the brightness value of the brightness value and adjacent image block of image block for each image block in the present embodiment
Difference is adjusted default index.Wherein, the brightness value of image block can be equal to the brightness value of all pixels point in image block
The sum of, the ratio of the quantity for the pixel for including with image block.
In specific implementation, the corresponding relationship between difference and the adjustment amount of default index can be pre-established, is schemed determining
As the brightness value of the brightness value and adjacent image block of block difference after, inquiry corresponding relationship can be passed through, determine the tune of default index
Whole amount, and then default index is adjusted.Wherein, difference is bigger, and the value for presetting index is bigger.
Step 303, using default index adjusted and corresponding exponential function, the brightness value of image block is adjusted
It is whole.
After adjusting default index, using default index adjusted and corresponding exponential function, to the bright of image block
Angle value is adjusted.Wherein, exponential function formula is as in the foregoing embodiment.
The video transcoding method of the embodiment of the present application, by the way that for each image in video, each image is divided into
Multiple images block is finely adjusted brightness value using image block, expands effect so as to improve brightness.
After the brightness value of each image block of each image is adjusted in the first video, the first video can be judged again
In the difference of brightness value between each pixel and neighbor pixel whether be greater than preset difference value threshold value, thus pre- being greater than
If when difference threshold, being filtered using filter to pixel, avoiding the occurrence of tinge situation, to further increase video
Effect is expanded in brightness, and then improves the HDR effect of video.
In order to realize above-described embodiment, the embodiment of the present application also proposes a kind of video code conversion device.Fig. 4 is the application implementation
A kind of structural schematic diagram for video code conversion device that example provides.
As shown in figure 4, the video code conversion device includes: to obtain module 410, mapping block 420, enlargement module 430.
Module 410 is obtained for obtaining video to be transcoded；Wherein, the video format of video to be transcoded is standard dynamic range
SDR。
Mapping block 420 is used to the source space of video to be transcoded being mapped to linear RGB space, obtains the first video.
Enlargement module 430 is used to the local colour gamut of S in the space HSI be expanded to the space reflection of the first video to the space HSI
It is charged to target color gamut, by the HSI space reflection after expansion to linear RGB space.
Enlargement module 430 is also used to the brightness domain of the first video extending to object brightness domain；Target color gamut and target are bright
It spends domain to be determined according to the video format of target video, the video format of target video is high dynamic range HDR.
Mapping block 420 be also used to expand after the first video space reflection to source space, obtain target video.
In a kind of possible implementation of the embodiment of the present application, above-mentioned mapping block 420 is specifically used for,
The source space of video to be transcoded is mapped to the space linear R GB；
The space linear R GB for treating transcoded video is normalized, the space linear R GB after being normalized；
By the linear R GB space reflection after normalization to linear RGB space, the first video is obtained.
In a kind of possible implementation of the embodiment of the present application, above-mentioned enlargement module 430 is specifically used for,
The linear RGB space of first video is mapped to XYZ space；
By XYZ space according to the chromaticity coordinate of target video, it is mapped to the space HSI；
For the S in the space HSI, the highest local colour gamut of chromatic value in S is obtained；
Using linearly drawing high algorithm or according to pre-programmed curve, local colour gamut extended to target color gamut.
In a kind of possible implementation of the embodiment of the present application, above-mentioned mapping block 420 is also used to institute is to be transcoded
The source space of video is mapped to linear RGB space, and after obtaining the first video, the linear RGB space of the first video is mapped
To the space CIELAB；
Enlargement module 430, is also used to extend to the highest local colour gamut of the numerical value of dimension each in the space CIELAB pair
The target color gamut answered.
In a kind of possible implementation of the embodiment of the present application, above-mentioned enlargement module 430 is specifically used for,
Using default index and corresponding exponential function, the brightness domain of the first video is extended into object brightness domain；
For each pixel in the first video, preset when the difference of pixel and the brightness value of neighbor pixel is greater than
When difference threshold, the pixel is filtered using filter, the difference between smooth pixel point and neighbor pixel；
Filter is determined according to the brightness value of neighbor pixel.
In a kind of possible implementation of the embodiment of the present application, above-mentioned enlargement module 430 is specifically also used to,
For each image in the first video, multiple images block is divided an image into；
Default index is adjusted according to the difference of the brightness value between image block and adjacent image block for image block
It is whole；
Using default index adjusted and corresponding exponential function, the brightness value of image block is adjusted.
In a kind of possible implementation of the embodiment of the present application, above-mentioned enlargement module 430 is specifically also used to,
Obtain the brightness value of each pixel in the first video；
According to the brightness value of each pixel, initial default index is adjusted.
In a kind of possible implementation of the embodiment of the present application, above-mentioned mapping block 420 is specifically used for,
The linear RGB space of first video is mapped according to PQ curve as defined in target video, obtains linear R GB
Space；
By linear R GB space reflection to source space, target video is obtained.
It should be noted that the aforementioned explanation to video transcoding method embodiment, is also applied for the view of the embodiment
Frequency transcoding device, therefore details are not described herein.
Video code conversion device provided by the embodiments of the present application, by obtaining video to be transcoded, then by video to be transcoded
Source space is mapped to linear RGB space, obtains the first video, later by the space reflection of the first video to the space HSI, by HSI
The local colour gamut of S extends to target color gamut in space, by the HSI space reflection after expansion to linear RGB space, and by first
The brightness domain of video extends to object brightness domain, then the space reflection of the first video after expansion is obtained target to source space
Video.As a result, by the way that video to be transcoded is mapped to linear RGB space by source space after, carry out colour gamut expansion and brightness domain
Expand, then the first video after expansion be mapped to source space by linear RGB space, obtain HDR video, thus realize by
SDR Video Quality Metric is HDR video, so that user can watch the HDR effect of SDR video, greatly in the equipment for supporting HDR
Viewing effect is improved greatly.
In order to realize above-described embodiment, the embodiment of the present application also proposes a kind of computer equipment, including memory, processor
And storage is on a memory and when processor described in the computer program that can run on a processor executes described program, realization
Video transcoding method as described in above-described embodiment.
Fig. 5 shows the block diagram for being suitable for the exemplary computer device for being used to realize the application embodiment.What Fig. 5 was shown
Computer equipment 12 is only an example, should not function to the embodiment of the present application and use scope bring any restrictions.
As shown in figure 5, computer equipment 12 is showed in the form of universal computing device.The component of computer equipment 12 can be with
Including but not limited to: one or more processor or processing unit 16, system storage 28 connect different system components
The bus 18 of (including system storage 28 and processing unit 16).
Bus 18 indicates one of a few class bus structures or a variety of, including memory bus or Memory Controller,
Peripheral bus, graphics acceleration port, processor or the local bus using any bus structures in a variety of bus structures.
For example, these architectures include but is not limited to industry standard architecture (Industry Standard
Architecture；Hereinafter referred to as: ISA) bus, microchannel architecture (Micro Channel Architecture；With
Lower abbreviation: MAC) bus, enhanced isa bus, Video Electronics Standards Association (Video Electronics Standards
Association；Hereinafter referred to as: VESA) local bus and peripheral component interconnection (Peripheral Component
Interconnection；Hereinafter referred to as: PCI) bus.
Computer equipment 12 typically comprises a variety of computer system readable media.These media can be it is any can be by
The usable medium that computer equipment 12 accesses, including volatile and non-volatile media, moveable and immovable Jie
Matter.
System storage 28 may include the computer system readable media of form of volatile memory, such as arbitrary access
Memory (Random Access Memory；Hereinafter referred to as: RAM) 30 and/or cache memory 32.Computer equipment
12 may further include other removable/nonremovable, volatile/non-volatile computer system storage mediums.Only make
For citing, storage system 34 can be used for reading and writing immovable, non-volatile magnetic media, and (Fig. 5 is not shown, commonly referred to as " hard
Disk drive ").Although being not shown in Fig. 5, can provide for being read and write to removable non-volatile magnetic disk (such as " floppy disk ")
Disc driver, and to removable anonvolatile optical disk (such as: compact disc read-only memory (Compact Disc Read
Only Memory；Hereinafter referred to as: CD-ROM), digital multi CD-ROM (Digital Video Disc Read Only
Memory；Hereinafter referred to as: DVD-ROM) or other optical mediums) read-write CD drive.In these cases, each drive
Dynamic device can be connected by one or more data media interfaces with bus 18.Memory 28 may include at least one journey
Sequence product, the program product have one group of (for example, at least one) program module, these program modules are configured to perform this Shen
Please each embodiment function.
Program/utility 40 with one group of (at least one) program module 42 can store in such as memory 28
In, such program module 42 includes --- but being not limited to --- operating system, one or more application program, Qi Tacheng
It may include the realization of network environment in sequence module and program data, each of these examples or certain combination.Program
Module 42 usually executes function and/or method in embodiments described herein.
Computer equipment 12 can also be with one or more external equipments 14 (such as keyboard, sensing equipment, display 24
Deng) communication, can also be enabled a user to one or more equipment interact with the computer equipment 12 communicate, and/or with make
The computer equipment 12 any equipment (such as network interface card, the modulatedemodulate that can be communicated with one or more of the other calculating equipment
Adjust device etc.) communication.This communication can be carried out by input/output (I/O) interface 22.Also, computer equipment 12 is also
Network adapter 20 and one or more network (such as local area network (Local Area Network can be passed through；Following letter
Claim: LAN), wide area network (Wide Area Network；Hereinafter referred to as: WAN) and/or public network, for example, internet) communication.
As shown in figure 5, network adapter 20 is communicated by bus 18 with other modules of computer equipment 12.Although should be understood that figure
It is not shown in 5, other hardware and/or software module can be used in conjunction with computer equipment 12, including but not limited to: microcode,
Device driver, redundant processing unit, external disk drive array, RAID system, tape drive and data backup storage
System etc..
Processing unit 16 by the program that is stored in system storage 28 of operation, thereby executing various function application and
Data processing, such as realize video transcoding method provided by the above embodiment.
The embodiment of the present application also provides a kind of non-transitorycomputer readable storage medium, is stored thereon with computer journey
Sequence realizes the video transcoding method as described in above-described embodiment when the program is executed by processor.
Above-mentioned non-transitorycomputer readable storage medium can appointing using one or more computer-readable media
Meaning combination.Computer-readable medium can be computer-readable signal media or computer readable storage medium.Computer can
Reading storage medium for example may be-but not limited to-the system of electricity, magnetic, optical, electromagnetic, infrared ray or semiconductor, device
Or device, or any above combination.The more specific example (non exhaustive list) of computer readable storage medium wraps
It includes: there is the electrical connection of one or more conducting wires, portable computer diskette, hard disk, random access memory (RAM), read-only
Memory (Read Only Memory；Hereinafter referred to as: ROM), erasable programmable read only memory (Erasable
Programmable Read Only Memory；Hereinafter referred to as: EPROM) or flash memory, optical fiber, portable compact disc are read-only
Memory (CD-ROM), light storage device, magnetic memory device or above-mentioned any appropriate combination.In this document, it counts
Calculation machine readable storage medium storing program for executing can be it is any include or storage program tangible medium, the program can be commanded execution system,
Device or device use or in connection.
Computer-readable signal media may include in a base band or as carrier wave a part propagate data-signal,
Wherein carry computer-readable program code.The data-signal of this propagation can take various forms, including --- but
It is not limited to --- electromagnetic signal, optical signal or above-mentioned any appropriate combination.Computer-readable signal media can also be
Any computer-readable medium other than computer readable storage medium, which can send, propagate or
Transmission is for by the use of instruction execution system, device or device or program in connection.
The program code for including on computer-readable medium can transmit with any suitable medium, including --- but it is unlimited
In --- wireless, electric wire, optical cable, RF etc. or above-mentioned any appropriate combination.
Can with one or more programming languages or combinations thereof come write for execute the application operation computer
Program code, described program design language include object oriented program language-such as Java, Smalltalk, C++,
It further include conventional procedural programming language-such as " C " language or similar programming language.Program code can be with
Fully execute, partly execute on the user computer on the user computer, being executed as an independent software package,
Part executes on the remote computer or executes on a remote computer or server completely on the user computer for part.
In situations involving remote computers, remote computer can pass through the network of any kind --- including local area network
(Local Area Network；Hereinafter referred to as: LAN) or wide area network (Wide Area Network；Hereinafter referred to as: WAN) connect
To subscriber computer, or, it may be connected to outer computer (such as pass through internet using ISP
Connection).
It should be noted that term " first ", " second " etc. are used for description purposes only in the description of the present application, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present application, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of the module of code of executable instruction, segment or
Part, and the range of the preferred embodiment of the application includes other realization, wherein can not press shown or discussed
Sequentially, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be by this
The embodiment person of ordinary skill in the field of application is understood.
It should be appreciated that each section of the application can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, multiple steps or method can be executed soft in memory and by suitable instruction execution system with storage
Part or firmware are realized.It, and in another embodiment, can be with well known in the art for example, if realized with hardware
Any one of following technology or their combination are realized: having a logic gate for realizing logic function to data-signal
The discrete logic of circuit, the specific integrated circuit with suitable combinational logic gate circuit, programmable gate array
(Programmable Gate Array；Hereinafter referred to as: PGA), field programmable gate array (Field Programmable
Gate Array；Hereinafter referred to as: FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage
In medium, which when being executed, includes the steps that one or a combination set of embodiment of the method.
In addition, each functional module in each embodiment of the application can integrate in a processing module, it is also possible to
Modules physically exist alone, and can also be integrated in a module with two or more modules.Above-mentioned integrated module
Both it can take the form of hardware realization, can also have been realized in the form of software function module.If the integrated module
In the form of software function module realize and when sold or used as an independent product, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although embodiments herein has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be understood as the limitation to the application, those skilled in the art within the scope of application can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (11)
1. a kind of video transcoding method characterized by comprising
Obtain video to be transcoded；The video format of the video to be transcoded is standard dynamic range SDR；
The source space of the video to be transcoded is mapped to linear RGB space, obtains the first video；
By the space reflection of first video to the space HSI, the local colour gamut of S in the space HSI is extended into target color gamut, it will
HSI space reflection after expansion is to linear RGB space；
The brightness domain of first video is extended into object brightness domain；The target color gamut and the object brightness domain are according to mesh
The video format for marking video determines that the video format of the target video is high dynamic range HDR；
By the space reflection of the first video after expansion to the source space, the target video is obtained.
2. the method according to claim 1, wherein the source space by the video to be transcoded is mapped to line
Property rgb space, obtains the first video, comprising:
The source space of the video to be transcoded is mapped to the space linear R GB；
The space linear R GB of the video to be transcoded is normalized, the space linear R GB after being normalized；
By the linear R GB space reflection after the normalization to linear RGB space, first video is obtained.
3. the method according to claim 1, wherein the space reflection of first video to the space HSI is incited somebody to action
The local colour gamut of S extends to target color gamut in the space HSI, comprising:
The linear RGB space of first video is mapped to XYZ space；
By the XYZ space according to the chromaticity coordinate of target video, it is mapped to the space HSI；
For the S in the space HSI, the highest local colour gamut of chromatic value in S is obtained；
Using linearly drawing high algorithm or according to pre-programmed curve, the local colour gamut extended to target color gamut.
4. the method according to claim 1, wherein the source space of the video to be transcoded is mapped to linearly
Rgb space, after obtaining the first video, further includes:
The linear RGB space of first video is mapped to the space CIELAB；
The highest local colour gamut of the numerical value of each dimension in the space CIELAB is extended into corresponding target color gamut.
5. the method according to claim 1, wherein the brightness domain by first video extends to target
Brightness domain, comprising:
Using default index and corresponding exponential function, the brightness domain of first video is extended into object brightness domain；
For each pixel in first video, when the difference of the pixel and the brightness value of neighbor pixel is greater than
When preset difference value threshold value, the pixel is filtered using filter, between the smooth pixel and neighbor pixel
Difference；The filter is determined according to the brightness value of neighbor pixel.
6. according to the method described in claim 5, it is characterized in that, described using default index and corresponding exponential function,
The brightness domain of first video is extended to after object brightness domain, further includes:
For each image in first video, multiple images block is divided the image into；
For described image block, according to the difference of the brightness value between described image block and adjacent image block, to default index into
Row adjustment；
Using default index adjusted and corresponding exponential function, the brightness value of described image block is adjusted.
7. according to the method described in claim 5, it is characterized in that, described using default index and corresponding exponential function,
The brightness domain of first video is extended to before object brightness domain, further includes:
Obtain the brightness value of each pixel in first video；
According to the brightness value of each pixel, initial default index is adjusted.
8. the method according to claim 1, wherein the space reflection by the first video after expansion is to institute
Source space is stated, the target video is obtained, comprising:
The linear RGB space of first video is mapped according to PQ curve as defined in target video, obtains linear R GB
Space；
By the linear R GB space reflection to the source space, the target video is obtained.
9. a kind of video code conversion device characterized by comprising
Module is obtained, for obtaining video to be transcoded；The video format of the video to be transcoded is standard dynamic range SDR；
Mapping block obtains the first video for the source space of the video to be transcoded to be mapped to linear RGB space；
Enlargement module, for by the space reflection of first video to the space HSI, the local colour gamut of S in the space HSI to be expanded
To target color gamut, by the HSI space reflection after expansion to linear RGB space；
The enlargement module is also used to the brightness domain of first video extending to object brightness domain；The target color gamut and
The object brightness domain determines that the video format of the target video is high dynamic range according to the video format of target video
HDR；
The mapping block, the space reflection of the first video after being also used to expand obtain the target to the source space
Video.
10. a kind of computer equipment, which is characterized in that including memory, processor and store on a memory and can handle
The computer program run on device when the processor executes described program, realizes such as view described in any one of claims 1-8
Frequency code-transferring method.
11. a kind of non-transitorycomputer readable storage medium, is stored thereon with computer program, which is characterized in that the program
Such as video transcoding method described in any one of claims 1-8 is realized when being executed by processor.
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| CN114501023B (en) * | 2022-03-31 | 2022-07-26 | 深圳思谋信息科技有限公司 | Video processing method, device, computer equipment and storage medium |
| CN114693567A (en) * | 2022-05-30 | 2022-07-01 | 深圳思谋信息科技有限公司 | Image color adjusting method and device, computer equipment and storage medium |
| CN116167950A (en) * | 2023-04-26 | 2023-05-26 | 镕铭微电子(上海)有限公司 | Image processing method, device, electronic equipment and storage medium |
| CN116167950B (en) * | 2023-04-26 | 2023-08-04 | 镕铭微电子(上海)有限公司 | Image processing method, device, electronic equipment and storage medium |
| CN117319620A (en) * | 2023-11-30 | 2023-12-29 | 深圳市尊正数字视频有限公司 | HDR preview-level on-site real-time color mixing method |
| CN117319620B (en) * | 2023-11-30 | 2024-03-08 | 深圳市尊正数字视频有限公司 | HDR preview-level on-site real-time color mixing method |
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