CN106961610A - With reference to the ultra high-definition video new type of compression framework of super-resolution rebuilding - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/154—Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion
Abstract
The present invention provides a kind of ultra high-definition video new type of compression framework of combination super-resolution rebuilding for HEVC video encoding standards.Mainly using odd number dividing method, with reference to the super-resolution rebuilding technology based on study.Single image or the compression performance of I frames, by the use of HEVC as basic coding framework, are compressed using the respective feature of HEVC intraframe codings and interframe encode to video sequence come further lift pins using a kind of strategy based on " segmentation based compensation ".And further lifted using super-resolution rebuilding technology to rebuilding video objective quality.Test result indicate that, video-frequency compression method of the invention realizes the lifting of the reconstruction video quality in the case of the equal code check at low bit- rate end substantially.
Description
Technical field
The present invention relates to the video compression technology problem in field of picture communication, more particularly, to one kind combination super-resolution
The ultra high-definition video-frequency compression method of reconstruction.
Background technology
With the popularization of high-definition image and video (1920 × 1080 pixels and more than), or even existing 4K (3840 × 2160)
Signal and 8K (8192 × 4320) ultra high-definition video of television set, people are continuously increased to the demand of high-definition image and video,
Data volume also constantly increase therewith.Capacity extensions and the retrofit of transmission equipment simply by virtue of hard disk, can't be well
The problem of solving storage and transmit.Therefore, how ensure video encoding quality while reduction coding computation complexity into
For the focus of field of video encoding research.
It is known that the pressure to data volume can be realized using the redundancy of image and video resource over time and space
Contracting.Existing JPEG, JPEG2000 standard for still image compression, is primarily adapted for use in the coding standard of video resource compression
H.264/AVC, newest high-performance video coding (HEVC) etc. is all the hybrid coding frame that transition coding and predictive coding are combined
Frame.Similar to conventional international standard, HEVC still uses hybrid encoding frame, including Bian Change, quantization, entropy code, frame in are pre-
The modules such as survey, inter prediction and loop filtering.But HEVC almost introduces new coding techniques in each module.
HEVC coding standards with main flow before compression standard H.264/AVC compared with, the quality of reconstruction image under identical PSNR, coding
Code check can save more than 50%, at present for, the performance of HEVC standard is best, has exceeded conventional all images and has regarded
Frequency coding standard.But HEVC encoding computational complexity have also exceeded conventional all coding standards, therefore, some research institutions and
Researcher expands numerous studies to the encoding computational complexity for how effectively reducing HEVC.
Actually in the H.264/AVC Video coding stage, one is had been achieved for for the research in terms of compression performance lifting
Fixed achievement.Wherein the coding efficiency of frame in adaptivenon-uniform sampling predictive coding (ADPC) is lifted than more prominent.ADPC passes through I frames
Horizontally or vertically sampling is divided into two frames and carries out frame in and interframe encode respectively, reuses two kinds of use sides of rate distortion costs function pair
Formula and normative forecast pattern carry out optimal selection.In addition, being calculated for inter prediction macro-block level mixing spatio-temporal prediction H.264/AVC
Method (MLH-TSP) is suggested.MLH-TSP proposes vertical spatio-temporal prediction (VTSP) and horizontal spatio-temporal prediction (HTSP) is used for encoding
Macro block in inter-frame encoding frame, finally carries out the selection of final predictive mode still with rate distortion costs function.But work as video
When sequence resolution is sufficiently large, possessing after a certain frame is divided into the subframe of four or more, between adjacent sub-frame has very strong
Temporal correlation, can make full use of the correlation of adjacent interframe, remove time redundancy.In order to reduce prediction residual i.e. further
The data volume to be transmitted is reduced, infra-frame prediction can reasonably be converted into inter prediction.It is a kind of based on the adaptive of tree structure
The intraframe predictive coding algorithm that should sample more is suggested (A Tree Structure Based Adaptive Multisampling
Prediction Coding for Intra-Frame, TS_AMPC).The method continues to continue to use the thinking of segmentation, and I frames are split
To carry out frame in and interframe encode respectively after 4 subframes, finally using four kinds of employing modes of rate distortion costs function pair and standard
Predictive mode carries out optimal selection.
The content of the invention
In order to improve video compression coding standard HEVC video coding performances of new generation, the present invention is making full use of HEVC to compile
In code standard base, with reference to super-resolution rebuilding technology, infra-frame prediction and inter prediction correlation, it is proposed that a kind of novel video
Compaction coding method, has certain performance boost in low bit- rate section compared to HEVC standard coding method.
The basic thought of the present invention is to single width figure using a kind of strategy based on " segmentation-compensation " come further lift pins
The compression performance of picture or I frames, by the use of HEVC as basic coding framework, utilizes HEVC intraframe codings and the respective spy of interframe encode
Levy and video sequence is compressed.And it is further to rebuilding video objective quality using the super-resolution rebuilding technology based on study
Lifting.And then reach the purpose that video coding performance is further improved on the basis of HEVC.
The present invention proposes a kind of novel video compressed encoding framework for the compression of ultra high-definition video sequence, and this is compiled with tradition
Code framework HEVC is combined, while using odd number dividing method, the I frames of ultra high-definition video sequence being carried out down-sampling, reduced
The data volume of video sequence.The present invention takes full advantage of compression performance excellent in existing standard framework, so as to fundamentally protect
The compression performance for having demonstrate,proved this framework is not lowered.The present invention is rebuilding link using super-resolution technique to the progress of related reconstruction frames
Objective quality is compensated.It is specific mainly to include procedure below step：
(1) whether be 1st frame, if the 1st frame if judging current encoded frame, then to the 1st frame of original ultra high-definition video sequence
Carry out odd number and be divided into 5 frames；
(2) follow-up three frame in ultra high-definition video sequence successively interlacing is obtained into 3 frames every row down-sampling, constitutes the high definition of 8 frames
Video sequence, is carried out to the obtained clear video sequence of 8 vertical frame dimensions using encoder_lowdelay_P_main.cfg configuration files
IPPP interframe encodes, form code stream；
(3) preceding 4 P frames of the HD video sequence obtained using decoding end, enter the ultra high-definition rebuild after row interpolation
1st frame of video sequence；
(4) the 1st frame of ultra high-definition video sequence after reconstruction and the 1st frame of HD video sequence after coding are done into super-resolution
Dictionary training obtains dictionary corresponding with each QP value, instructs the remaining 3 P frames of HD video sequence after coding to carry out using dictionary
Super-resolution rebuilding is rear 3 frame of ultra high-definition video sequence；
(5) 3 after 1 I frame of ultra high-definition video sequence after combination is rebuild and the HD video sequence after super-resolution rebuilding
Individual P frames, generate new ultra high-definition video sequence.
In the above-mentioned technical proposal of the present invention, in step (1), the first frame is divided into 1 I frame using odd number segmentation
With 4 P frames, each point pixel is averaging by every 4 pixel values in original graph and obtained wherein in I frames, and each point pixel is by original in P frames
Beginning figure interlacing is obtained every row down-sampling.
In the above-mentioned technical proposal of the present invention, the ultra high-definition video new type of compression frame of the combination super-resolution rebuilding
Frame, is HD video sequence by original ultra high-definition sequence down-sampling, reduces I frame bit rates.
In the above-mentioned technical proposal of the present invention, the inter-frame encoding methods of the HEVC keep HEVC coding and decoding processes
Complete stabilization, encoding and decoding step therein is made no modifications.
In the above-mentioned technical proposal of the present invention, the super-resolution dictionary training method constructs corresponding Sample Storehouse, adopts
Super-resolution dictionary training is carried out with K-SVD dictionary learnings algorithm.
In the above-mentioned technical proposal of the present invention, the Sample Storehouse that the super-resolution dictionary training method is used is not used only
1st frame of ultra high-definition video sequence after reconstruction, while using the 1st frame of HD video sequence after coding.
According to the present invention the above method can work out perform above-mentioned combination super-resolution rebuilding ultra high-definition video it is new
Compression method.
The present invention is to be analyzed and completed based on following thinking：
Video sequence is in HEVC cataloged procedures, and intraframe coding needs to occupy more coded-bits, i.e. I than interframe encode
Frame data amount is far longer than P frame data amount, and one width rest image down-sampling is split using I frames and the respective coding characteristic of P frames
After be combined into video sequence, then the video sequence coding data volume that combines can be less than I is carried out to original static stationary image
The data volume of frame coding.When the resolution ratio of piece image is sufficiently large, after diagram picture is divided into four or more subframes,
There is very strong temporal correlation between the subframe formed after these segmentations, especially in ultra high-definition image, this feature is more
It is prominent, so prediction residual is relatively flat, i.e., many prediction residual values are close to zero.Therefore we can be directed to ultra high-definition figure
Picture and video (more than 1600P) are split.
In constituted HD video sequence is split, the 1st frame I frames of HD video sequence are by ultra high-definition video sequence
4 points of averagings of I frames in row are obtained；The rear 4 frame P of HD video sequence1To P4Frame, by the I frames in ultra high-definition video sequence every
Row is obtained successively every row down-sampling；Most followed by HD video sequence 3 frame P5To P7Frame, by follow-up 3 in ultra high-definition video sequence
Interlacing is obtained P frames every row down-sampling successively.In HEVC coding sides IPPP codings, shape are carried out for the HD video sequence after segmentation
Into respective code stream.This process keeps HEVC to code and decode the complete stabilization of process, and encoding and decoding step therein is not appointed
What is changed.
It is last in decoding end, the I frames and P frames of decoded HD video sequence are carried out rebuilding respectively obtain ultra high-definition and regard
Frequency sequence.The method split using odd number is the P in high definition sequence after decoding and rebuilding1To P4Frame interpolation obtains ultra high-definition I frames, makees
For the 1st frame of ultra high-definition video after reconstruction.With this I frame and the I of HD video sequence1Do the training of super-resolution dictionary and generate each QP
(35-50) corresponding dictionary, HD video after being decoded using the dictionary trained to the remaining 3 P frames of HD video sequence
P in sequence5To P7Frame carries out super-resolution computing, obtains 3 P frames after corresponding ultra high-definition.The ultra high-definition I frames obtained using interpolation
The ultra high-definition video sequence after rebuilding is combined into the follow-up 3 P frames of ultra high-definition after super-resolution rebuilding.Test result indicate that,
The video-frequency compression method of the present invention, realizes carrying for the reconstruction video quality in the case of the equal code check at low bit- rate end substantially
Rise.
Brief description of the drawings
Fig. 1 HD video sequences segmentation scheme schematic diagrames；
Fig. 2 HD video sequence coding/decoding processes；
Fig. 3 ultra high-definitions video sequence generates schematic diagram.
Embodiment
With reference to embodiment, the present invention is described in further detail, it is necessary to, it is noted that following embodiment
It is served only for that the present invention is described further, it is impossible to be interpreted as limiting the scope of the invention, art technology is ripe
Personnel are known according to foregoing invention content, some nonessential modifications and adaptations are made to the present invention and are embodied, should still be belonged to
In protection scope of the present invention.
1. the program of two algorithms is opened simultaneously and sets identical configuration file, reference software selection HM16.0, amount
Change step-length (QP) value and take 35,40,45 and 50 respectively.The present invention is by the method with the frame of HEVC direct coding ultra high-definitions video sequence 4
It is compared.And to its two kinds of video coding performances：(wherein PSNR embodies the visitor of video for bit rate, Y-PSNR (PSNR)
See video quality), compare analysis.
2. the object of coding is that ultra high-definition video sequence is：Training、Running、Cup、Dolls、Penguin、
Jogging。
3. Video coding is carried out under HEVC modes to ultra high-definition video sequence using HM16.0 standard methods；
4. it will be adopted under ultra high-definition video as 8 frame HD videos；
5. Video coding is carried out under HEVC modes to HD video sequence using HM16.0 standard methods；
6. pair HD video Format Series Lines code stream decoding, obtains decoded video, decoded video is carried out based on study
Super-resolution video reconstruction.
7. two programs export the bit rate after Video coding, PSNR values, the result such as table of above-mentioned 2 quality index respectively
Shown in 1.Statistics is shown in low bit- rate section (QP scope 35-50) inventive algorithm experiment compression performance and has substantially exceeded HEVC compressions
Performance.
The comparison of the inventive algorithm of table 1 and HEVC standard video coding performance
Claims (7)
1. a kind of ultra high-definition video new type of compression framework of combination super-resolution rebuilding, it is characterised in that：
(1) whether be 1st frame, if the 1st frame if judging current encoded frame, then the 1st frame of original ultra high-definition video sequence is carried out
Odd number is divided into 5 frames；
(2) follow-up three frame in ultra high-definition video sequence successively interlacing is obtained into 3 frames every row down-sampling, constitutes the HD video of 8 frames
Sequence, encoder_lowdelay_P_main.cfg configuration files progress IPPP frames are used to the obtained clear video sequence of 8 vertical frame dimensions
Between encode, formed code stream；
(3) preceding 4 P frames of the HD video sequence obtained using decoding end, enter the ultra high-definition video rebuild after row interpolation
1st frame of sequence；
(4) the 1st frame of ultra high-definition video sequence after reconstruction and the 1st frame of HD video sequence after coding are made into super-resolution dictionary
Training obtains dictionary corresponding with each QP value, instructs the remaining 3 P frames of HD video sequence after coding to carry out oversubscription using dictionary
Resolution is redeveloped into rear 3 frame of ultra high-definition video sequence；
(5) 3 P after 1 I frame of ultra high-definition video sequence after combination is rebuild and the HD video sequence after super-resolution rebuilding
Frame, generates new ultra high-definition video sequence.
2. the ultra high-definition video new type of compression framework of super-resolution rebuilding is combined as claimed in claim 1, it is characterised in that profit
The first frame is divided into 1 I frame and 4 P frames with odd number segmentation, each point pixel is by every 4 pixel values in original graph wherein in I frames
Averaging is obtained, and each point pixel is obtained by original graph interlacing every row down-sampling in P frames.
3. HEVC inter-frame encoding methods as claimed in claim 2, it is characterised in that keep the complete of HEVC coding and decoding processes
Whole stabilization, makes no modifications to encoding and decoding step therein.
4. the ultra high-definition video new type of compression framework of the combination super-resolution rebuilding as described in one of claim 1 and 2, its feature
Be by original ultra high-definition sequence down-sampling be HD video sequence, reduce I frame bit rates.
5. the super-resolution dictionary training method in such as claim 4, it is characterized in that corresponding Sample Storehouse is constructed, using K-SVD
Dictionary learning algorithm carries out super-resolution dictionary training.
6. such as the Sample Storehouse that super-resolution dictionary training method is used in claim 4, it is characterised in that after not using only reconstruction
1st frame of ultra high-definition video sequence, while using the 1st frame of HD video sequence after coding.
7. a kind of ultra high-definition video new type of compression framework for combining super-resolution rebuilding described in perform claim requirement 1 to 5.
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