CN101695133A - Video encoding and decoding method, system and encoder for backwards compatible simulcast of low-resolution/high-resolution programs - Google Patents
Video encoding and decoding method, system and encoder for backwards compatible simulcast of low-resolution/high-resolution programs Download PDFInfo
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Abstract
The invention discloses a video encoding and decoding method, a system and an encoder for backwards compatible simulcast of low-resolution/high-resolution programs. The method includes steps of performing down sampling on an inputted original high-resolution program source sequence to acquire a low-resolution program sequence, compressing the low-resolution program sequence to acquire a compressed reconstructed low-resolution program sequence, performing up sampling on the compressed reconstructed low-resolution program sequence to acquire an up-sampled high-resolution program sequence, performing differential operation between the original high-resolution program source sequence and the up-sampled high-resolution program sequence to acquire a differential sequence, compressing the differential sequence to acquire a compressed reconstructed differential sequence, and compounding the compressed reconstructed low-resolution program source sequence and the compressed reconstructed differential sequence to acquire a compounded high-resolution program sequence. The video encoding and decoding method, the system and the encoder for backwards compatible simulcast of low-resolution/high-resolution programs can effectively encode a high-resolution program source video sequence to save band width and can be compatible with the existing low-resolution program video encoding scheme.
Description
Technical field
The present invention relates to data compression and image processing field, relate in particular to video coding-decoding method, system and the encoder of backwards compatible simulcast of low-resolution/high-resolution programs.
Background technology
Along with the construction of China Broadcast ﹠ Television industry total digitalization, the Cable Network network will carry the challenge and the opportunity of " full-service operation ".Common Digital Television comprises SDTV (standard definition television, Standard-definition television) and HDTV (high definition TV, HighDefinition Television).The quality of the picture-and-sound of standard definition television all increases than present simulated television, and its channel utilance height, can broadcast 4 cover (or more) single-definitions programs in a channel of present simulated television simultaneously.High definition TV, picture can provide the amount of information that is equivalent to five times in standard definition television picture, therefore have higher image explanation filter and definition.The picture format of high definition TV is 1920*1080i and 1280*720i, i.e. the 2-3 of the highest demonstration and present simulated television image sharpness doubly.High definition TV adopts the image model of 16:9, rather than traditional 4:3 pattern, and standard definition television then adopts compatible 16:9 and 4:3 pattern, is finally determined the pattern of broadcasting by TV station.
What present digital television techniques adopted is Moving Picture Experts Group-2, and this is because at home and abroad (98 years begin to occur the satellite digital TV of MPEG-2, but are not that DTH is live to the family pattern through about ten years operation; Beginning to develop the cable digital TV of MPEG-2 in 2000) its technology and related industry chain be quite ripe.Along with increasing of high definition program source, digital TV in high resolution more and more becomes the main flow of Digital Television, and corresponding digital TV set-top box and codec chip also will adapt to the requirement of this development.In recent years, along with video compression standard of new generation H.264 and domestic appearance with AVS of independent intellectual property right, make the high definition program source efficiently is collapsed into possibility.
Because video compression standard of new generation has very high compression performance, make them become the prefered method of high definition/ultra high-definition program source compression.Yet because the program of having thrown on the market mostly adopts the MPEG-2 compression, therefore we need consider compatibility to through the SD program of MPEG-2 compression employing new technology high definition/superelevation radically reformed when compressing, thus user's paying with and the network bandwidth reach one aspect taking and compromise preferably.
The gradable video encoding (SVC, scalable video coding) of comparative maturity can solve the problem of SD/high definition and SD/ultra high-definition compatibility to a certain extent at present.But the defective of existence is, only SD and high definition/ultra high-definition adopt same standard when (as H.264) SVC could directly solve both compatibling problems.
In view of this, need the urgent problem that solves of those skilled in the art to be, need find a kind of efficient coding method, compatible low-resolution/high-resolution programs source of adopting the various criterion coding, for example compatible SD and high definition/ultra high-definition program source.
Summary of the invention
The objective of the invention is to, provide a kind of backward compatibility low-resolution/high-resolution with video coding-decoding method, system and the encoder broadcast.Based on the present invention, the low resolution/height that can compatible adopt various criterion is the program source of rate respectively.
First aspect the invention provides a kind of backward compatibility low-resolution/high-resolution with the video coding-decoding method of broadcasting, and comprises the steps: the original high resolution program source sequence of input is carried out down-sampling, obtains the lower resolution programs sequence; Described lower resolution programs sequence is compressed, obtained the lower resolution programs sequence of compression reconfiguration; Lower resolution programs sequence to described compression reconfiguration is carried out up-sampling, obtains the high-resolution program sequence of up-sampling; High-resolution program sequence to described original high resolution program source sequence and described up-sampling carries out calculus of differences, obtains difference sequence; Described difference sequence is compressed, obtained the difference sequence of compression reconfiguration; The lower resolution programs source sequence of described compression reconfiguration and the difference sequence of described compression reconfiguration are synthesized, obtain synthetic high-resolution program sequence.
In above-mentioned video coding-decoding method, preferred described lower resolution programs is the SD sequence, and described high-resolution program is high definition or ultra high-definition sequence.
In the compression step of above-mentioned video coding-decoding method, the preferred MPEG-2 of tool of compression.
H.264 or AVS in above-mentioned video coding-decoding method, in the preferred described difference sequence coding step, tool of compression is for.
According to a second aspect of the invention, the present invention also provides the video coding and decoding system of a kind of backward compatibility SD/high definition and SD/superelevation definition simulcast, comprises down sample module, compression module, up-sampling module, difference sequence generation module, difference sequence coding module, synthesis module.Described down sample module, compression module, up-sampling module, difference sequence generation module are positioned at the coding side of described system, and described synthesis module is positioned at the decoding end of system.Wherein:
Down sample module is used for the original high resolution program source sequence of input is carried out down-sampling, obtains the lower resolution programs sequence; Compression module is used for described lower resolution programs sequence is compressed, and obtains the lower resolution programs sequence of compression reconfiguration; The up-sampling module is used for the lower resolution programs sequence of described compression reconfiguration is carried out up-sampling, obtains the high-resolution program sequence of up-sampling; The difference sequence generation module is used for the high-resolution program sequence of described original high resolution program source sequence and described up-sampling is carried out calculus of differences, obtains difference sequence; The difference sequence coding module is used for described difference sequence is compressed, and obtains the difference sequence of compression reconfiguration; Synthesis module is used for the difference sequence of the lower resolution programs source sequence of described compression reconfiguration and described compression reconfiguration synthetic, obtains synthetic high-resolution program sequence.
The third aspect, the present invention also provides the video encoder of backwards compatible simulcast of low-resolution/high-resolution programs, the structure of described encoder is identical with the mechanism of coding side in the above-mentioned video coding and decoding system, promptly comprise down sample module, compression module, up-sampling module, difference sequence generation module, difference sequence coding module, do not repeat them here.
In prior art, the present invention can be compatible the low-resolution/high-resolution programs source of various criterion coding, for its compression provides support, and can effectively save bandwidth.Based on the present invention, can guarantee with market on the set-top box compatibility of the SD coding thrown in, thereby the user can be according to hobby selective reception low resolution or the high-resolution program of oneself.
Description of drawings
Fig. 1 is the flow chart of steps of the video coding-decoding method embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast according to the present invention;
Fig. 2 is the structured flowchart of the decoding method embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast according to the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Core concept of the present invention is: the high-resolution program source is carried out down-sampling obtain the low-resolution video sequence, the low-resolution video sequence is adopted compressed encoding, again the low-resolution video sequence of reconstruct is carried out up-sampling and obtain high-resolution program video sequence, then original high-resolution program source sequence and up-sampling are obtained high-resolution program video sequence and do difference to obtain difference sequence, adopt at last efficiently coding tools (as H.264 and AVS) difference sequence is encoded, the difference sequence of reconstruct and up-sampling are obtained high-resolution program video sequence synthesize and obtain final high-resolution program sequence.
Need to prove that at first the video coding-decoding method that the present invention relates to, coding/decoding system and encoder are applicable to lower resolution programs source and high-resolution program source.When carrying out the description of following specific embodiment, lower resolution programs is usually said " SD program ", and the high-resolution program is usually said " high definition program ".But high-resolution program and lower resolution programs are not limited to " high definition program " and " SD program ", should not be viewed as limitation of the present invention.
The video coding-decoding method embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast
With reference to Fig. 1, Fig. 1 is the flow chart of steps of the video coding-decoding method embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast according to the present invention, comprises the steps:
Step 110 is carried out down-sampling to the original high definition/ultra high-definition sequence of input, obtains the down-sampling SD sequence corresponding with described original high definition/ultra high-definition sequence.
In this step, at first high definition/ultra high-definition the sequence of input is carried out down-sampling, to generate corresponding SD sequence.The down-sampling process is
S＝D(H)
Wherein, H represents original high definition/ultra high-definition sequence, and D represents that down-sampling operation, S represent the SD sequence that generates behind the down-sampling.
Step 120 is compressed described down-sampling SD sequence by MPEG-2, obtains the down-sampling SD sequence of compression reconfiguration
The main purpose of this step is: the SD sequence after adopting MPEG-2 to down-sampling is encoded, to generate the code stream of 5M
This code stream sends to after the decoding end for you to choose, and the user of SD video frequency program uses.
Step 130 is carried out up-sampling to the down-sampling SD sequence of described compression reconfiguration, obtains up-sampling high definition/ultra high-definition sequence.
The up-sampling process is
Wherein, H
UHigh definition/ultra high-definition sequence after the expression up-sampling, U represents the up-sampling operation,
The SD sequence of expression reconstruct.
Step 140 is carried out calculus of differences, is obtained difference sequence described original high definition/ultra high-definition sequence and described up-sampling high definition/ultra high-definition sequence.
In this step, the generative process of difference sequence is:
In order to save the network bandwidth, present embodiment carries out up-sampling to generate corresponding high definition/ultra high-definition sequence to the SD sequence of reconstruct, does difference with original high definition/ultra high-definition sequence then and generates difference sequence.Can adopt any up-sampling scheme, but in order to make the energy of difference sequence as much as possible little to improve the performance of high definition/ultra high-definition coding, should select the more excellent up-sampling technology of serviceability as far as possible, for example, preferably utilize super-resolution that the SD sequence of reconstruct is interpolated into high definition/ultra high-definition sequence H
U, the phase advantage is to generate the lower difference sequence of energy.
Step 150 is compressed difference sequence, obtains the difference sequence of compression reconfiguration.
In this step, for the difference sequence of above-mentioned generation, the present invention adopts existing coding tools, as H.264 encoding with AVS, makes the high definition program source efficiently is collapsed into possibility.When coding, can also difference sequence can be used as a high definition/ultra high-definition sequence and send into encoder the difference sequence direct coding.
Step 160 is synthesized the down-sampling SD sequence of described compression reconfiguration and the difference sequence of described compression reconfiguration, obtains synthetic high definition/ultra high-definition sequence.
In this step, synthesize to the difference sequence of compression reconfiguration with through high definition/ultra high-definition sequence that up-sampling obtains, obtaining final high definition/ultra high-definition sequence, thereby satisfy the user's who selects high definition/ultra high-definition video demand.Concrete synthetic model is:
Wherein
The SD sequence of expression reconstruct,
It is right to represent
Carry out the process of up-sampling,
The difference sequence of expression reconstruct.
In the video coding-decoding method embodiment of this backward compatibility SD/high definition and SD/superelevation definition simulcast, can compatible SD and the high definition/ultra high-definition program source that adopts various criterion.Thereby, based on this embodiment, can guarantee with market on the set-top box compatibility of the SD coding thrown in, thereby, the user can be according to hobby selective reception SD or the high definition/ultra high-definition program of oneself, and provides support for the compression of high definition/ultra high-definition program simultaneously.
The video coding and decoding system embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast
With reference to Fig. 2, Fig. 2 is the structured flowchart of the decoding method embodiment of backward compatibility SD/high definition and SD/superelevation definition simulcast according to the present invention, comprising:
Down sample module 210 is used for the original high definition/ultra high-definition sequence of input is carried out down-sampling, obtains the down-sampling SD sequence corresponding with described original high definition/ultra high-definition sequence.
This module is used for the high definition/ultra high-definition sequence of input is carried out down-sampling, to generate corresponding SD sequence.The down-sampling process is
S＝D(H)
Wherein, H represents original high definition/ultra high-definition sequence, and D represents that down-sampling operation, S represent the SD sequence that generates behind the down-sampling.
MPEG-2 compression module 220 is used for by MPEG-2 described down-sampling SD sequence being compressed, and obtains the down-sampling SD sequence of compression reconfiguration.
The effect of this module is that the SD sequence after adopting MPEG-2 to down-sampling is encoded, to generate the code stream of 5M
This code stream sends to after the decoding end for you to choose, and the user of SD video frequency program uses.
Up-sampling module 230 is used for the down-sampling SD sequence of described compression reconfiguration is carried out up-sampling, obtains up-sampling high definition/ultra high-definition sequence.
Wherein, the up-sampling process is
Wherein, H
UHigh definition/ultra high-definition sequence after the expression up-sampling, U represents the up-sampling operation,
The SD sequence of expression reconstruct.
Difference sequence generation module 240 is used for described original high definition/ultra high-definition sequence and described up-sampling high definition/ultra high-definition sequence are carried out calculus of differences, obtained difference sequence.
In this module, the generative process of difference sequence is:
In order to save the network bandwidth, present embodiment carries out up-sampling to generate corresponding high definition/ultra high-definition sequence to the SD sequence of reconstruct, does difference with original high definition/ultra high-definition sequence and generates difference sequence.Can adopt any up-sampling scheme, in order to make the energy of difference sequence as much as possible little to improve the performance of high definition/ultra high-definition coding, should select the more excellent up-sampling technology of serviceability as far as possible, for example, preferably utilize super-resolution that the SD sequence of reconstruct is interpolated into high definition/ultra high-definition sequence H
U, the phase advantage is to generate the lower difference sequence of energy.
Difference sequence coding module 250 is used for described difference sequence is compressed, and obtains the difference sequence of compression reconfiguration.
In this module, the difference sequence of generation adopts existing coding tools, as H.264 encoding with AVS, makes the high definition program source efficiently is collapsed into possibility.When coding, can also difference sequence can be used as a high definition/ultra high-definition sequence and send into encoder the difference sequence direct coding.
Synthesis module 260 is used for the down-sampling SD sequence of described compression reconfiguration and the difference sequence of described compression reconfiguration are synthesized, and obtains synthetic high definition/ultra high-definition sequence.
In this module, synthesize to the difference sequence of compression reconfiguration with through high definition/ultra high-definition sequence that up-sampling obtains, obtaining final high definition/ultra high-definition sequence, thereby satisfy the user's who selects high definition/ultra high-definition video demand.Concrete synthetic model is:
Wherein
The SD sequence of expression reconstruct,
It is right to represent
Carry out the process of up-sampling,
The difference sequence of expression reconstruct.
This embodiment high definition/ultra high-definition video sequence of can encoding effectively, to save bandwidth, simultaneously also can be compatible mutually with the SD Video Coding Scheme of existing employing MPEG-2 coding.
According to a further aspect in the invention, also provide a kind of encoder, the structure that is positioned at coding side in the structure of this encoder and the above-mentioned coding/decoding system is identical, does not repeat them here.
The video coding-decoding method of backwards compatible simulcast of low-resolution/high-resolution programs, the execution mode and the effect of coding/decoding system have been stressed above.Encoder embodiment and decoding method, coding/decoding system embodiment principle are similar, the reference mutually of relevant part.
More than video coding-decoding method, system and the encoder of a kind of backwards compatible simulcast of low-resolution/high-resolution programs provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the video coding-decoding method of a backwards compatible simulcast of low-resolution/high-resolution programs is characterized in that, comprises the steps:
The down-sampling step is carried out down-sampling to the original high resolution program source sequence of input, obtains the lower resolution programs sequence;
Compression step compresses described lower resolution programs sequence, obtains the lower resolution programs sequence of compression reconfiguration;
The up-sampling step is carried out up-sampling to the lower resolution programs sequence of described compression reconfiguration, obtains the high-resolution program sequence of up-sampling;
Difference sequence generates step, and the high-resolution program sequence of described original high resolution program source sequence and described up-sampling is carried out calculus of differences, obtains difference sequence;
The difference sequence coding step compresses described difference sequence, obtains the difference sequence of compression reconfiguration;
Synthesis step synthesizes the lower resolution programs source sequence of described compression reconfiguration and the difference sequence of described compression reconfiguration, obtains synthetic high-resolution program sequence.
2. video coding-decoding method according to claim 1 is characterized in that, described lower resolution programs is the SD sequence, and described high-resolution program is high definition or ultra high-definition sequence.
3. video coding-decoding method according to claim 2 is characterized in that, in the described compression step, tool of compression is MPEG-2.
H.264 or AVS 4. video coding-decoding method according to claim 3 is characterized in that, in the described difference sequence coding step, tool of compression is for.
5. the video coding and decoding system of a backwards compatible simulcast of low-resolution/high-resolution programs is characterized in that, comprises the steps:
Down sample module is used for the original high resolution program source sequence of input is carried out down-sampling, obtains the lower resolution programs sequence;
Compression module is used for described lower resolution programs sequence is compressed, and obtains the lower resolution programs sequence of compression reconfiguration;
The up-sampling module is used for the lower resolution programs sequence of described compression reconfiguration is carried out up-sampling, obtains the high-resolution program sequence of up-sampling;
The difference sequence generation module is used for the high-resolution program sequence of described original high resolution program source sequence and described up-sampling is carried out calculus of differences, obtains difference sequence;
The difference sequence coding module is used for described difference sequence is compressed, and obtains the difference sequence of compression reconfiguration;
Synthesis module is used for the lower resolution programs source sequence of described compression reconfiguration and the difference sequence of described compression reconfiguration are synthesized, and obtains synthetic high-resolution program sequence;
Wherein, described down sample module, compression module, up-sampling module, difference sequence generation module are positioned at the coding side of described system, and described synthesis module is positioned at the decoding end of system.
6. video coding-decoding method according to claim 5 is characterized in that, described lower resolution programs is the SD sequence, and described high-resolution program is high definition or ultra high-definition sequence.
7. video coding-decoding method according to claim 6 is characterized in that, in the described compression step, tool of compression is MPEG-2.
H.264 or AVS 8. video coding-decoding method according to claim 7 is characterized in that, in the described difference sequence coding step, tool of compression is for.
9. the video encoder of a backwards compatible simulcast of low-resolution/high-resolution programs is characterized in that, comprising:
Down sample module is used for the original high resolution program source sequence of input is carried out down-sampling, obtains the lower resolution programs sequence;
Compression module is used for described lower resolution programs sequence is compressed, and obtains the lower resolution programs sequence of compression reconfiguration;
The up-sampling module is used for the lower resolution programs sequence of described compression reconfiguration is carried out up-sampling, obtains the high-resolution program sequence of up-sampling;
The difference sequence generation module is used for the high-resolution program sequence of described original high resolution program source sequence and described up-sampling is carried out calculus of differences, obtains difference sequence;
The difference sequence coding module is used for described difference sequence is compressed, and obtains the difference sequence of compression reconfiguration.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102209271A (en) * | 2011-05-31 | 2011-10-05 | 无锡商埃曲信息科技有限公司 | Method for making high-definition set top box compatible with standard-definition service |
| CN102348117A (en) * | 2010-08-03 | 2012-02-08 | 深圳Tcl新技术有限公司 | System of transmitting digital high definition signal with low bandwidth, method thereof and network multimedia television |
| CN106162180A (en) * | 2016-06-30 | 2016-11-23 | 北京奇艺世纪科技有限公司 | A kind of image coding/decoding method and device |
| CN106791896A (en) * | 2016-12-05 | 2017-05-31 | 上海港聚信息科技有限公司 | High definition/super clear program satellite internet transmission platform |
| CN108076301A (en) * | 2016-11-11 | 2018-05-25 | 联芯科技有限公司 | The method for processing video frequency and system of VoLTE video multi-party telephones |
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2009
- 2009-10-28 CN CN 200910235859 patent/CN101695133A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348117A (en) * | 2010-08-03 | 2012-02-08 | 深圳Tcl新技术有限公司 | System of transmitting digital high definition signal with low bandwidth, method thereof and network multimedia television |
| CN102209271A (en) * | 2011-05-31 | 2011-10-05 | 无锡商埃曲信息科技有限公司 | Method for making high-definition set top box compatible with standard-definition service |
| CN106162180A (en) * | 2016-06-30 | 2016-11-23 | 北京奇艺世纪科技有限公司 | A kind of image coding/decoding method and device |
| US10819994B2 (en) | 2016-06-30 | 2020-10-27 | Beijing Century Technology., Ltd | Image encoding and decoding methods and devices thereof |
| CN108076301A (en) * | 2016-11-11 | 2018-05-25 | 联芯科技有限公司 | The method for processing video frequency and system of VoLTE video multi-party telephones |
| CN106791896A (en) * | 2016-12-05 | 2017-05-31 | 上海港聚信息科技有限公司 | High definition/super clear program satellite internet transmission platform |
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Application publication date: 20100414 |