CN103414897A - Method and device for entropy decoding of video image - Google Patents
Method and device for entropy decoding of video image Download PDFInfo
- Publication number
- CN103414897A CN103414897A CN2013103288228A CN201310328822A CN103414897A CN 103414897 A CN103414897 A CN 103414897A CN 2013103288228 A CN2013103288228 A CN 2013103288228A CN 201310328822 A CN201310328822 A CN 201310328822A CN 103414897 A CN103414897 A CN 103414897A
- Authority
- CN
- China
- Prior art keywords
- bit
- bit stream
- table information
- entropy
- code table
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000013507 mapping Methods 0.000 claims abstract description 42
- 206010019133 Hangover Diseases 0.000 claims description 35
- 230000008569 process Effects 0.000 claims description 8
- 238000013139 quantization Methods 0.000 description 8
- 208000037170 Delayed Emergence from Anesthesia Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The invention discloses a method and device for entropy decoding of a video image. According to the method and device, an entropy decoding lookup table is reset, address bit mapping code table information is used, an address bit is determined by a coding schedule identification, a bit stream coded value and a bit stream coding length, the address bit is mapped to corresponding code table information, and the code table information can comprise the number of trailing coefficients, the number of nonzero coefficients, the trailing coefficients, the nonzero coefficients, the number of leading zeroes in each nonzero coefficient and other entropy decoding values which need to be obtained by inquiring and looking up the entropy decoding lookup table in turns for the entropy decoding. When a bit stream is subjected to entropy decoding bit by bit, the corresponding address bit is determined according to the bit stream coding length and the bit stream coded value, and the code table information is obtained according to corresponding address bit mapping. Due to the fact that the addressing space of the set entropy decoding lookup table is 1024, namely 10 bits are used for setting the address bit, a constructed decoding table occupies few hardware storage resources and is low in cost.
Description
Technical field
The present invention relates to the video image encoding and decoding technology, particularly a kind of method and device to the decoding of video image entropy.
Background technology
H.264 standard be International Organization for Standardization and International Telecommunication Union common propose continue Motion Picture Expert Group standard 4(MPEG4) after the new-generation digital video compression format.H.264 be that H.26x ITU-T be take series and be one of video coding and decoding technology standard of name nominating.This standard comes from the exploitation that is referred to as project H.26L of ITU-T the earliest.Although H.26L this title is not too common, is being used always.H.264 standard is that H.26x ITU-T be take series and be one of standard of name nominating.
H.264 standard is to set up on the basis of MPEG-4 technology, and its coding flow process mainly comprises 5 parts: interframe and infra-frame prediction (Estimation), conversion (Transform) and inverse transformation, quantification (Quantization) and inverse quantization, loop filtering (Loop Filter) and entropy coding (Entropy Coding).Its decode procedure is exactly the inverse process of cataloged procedure.
H.264 the main target of standard is: with other existing video encoding standard, compare, more outstanding video quality is provided under identical bandwidth.By this standard, the compression efficiency under equal video quality improves 2 times of left and right than MPEG2.
After video image has passed through interframe and infra-frame prediction, conversion and inverse transformation, quantification and inverse quantization, loop filtering, obtain the residual block quantization parameter, this residual block quantization parameter, after Z line ordering (Zig-Zag) scanning of quantization parameter, carries out the entropy coding.Entropy coding is suitable for transmitting and the bit stream that stores symbol data is compressed, and it is based on H.264 standard and video image is carried out to last link of cataloged procedure, is also an important link.When the data of residual block quantization parameter after Zig-Zag scanning were carried out the entropy coding, a kind of mode was based on contextual self-adapting changeable long codes (CAVLC).This CAVLC is mainly used in video image through based on after coding H.264, and the 4*4 obtained or 2*2 residual block quantization parameter are through the entropy coding of the data after Zig-Zag scanning.
At present, the cataloged procedure of CAVLC is:
At first, coding nonzero coefficient number and hangover coefficient number;
The hangover coefficient refers in residual block+-1, the number of hangover coefficient is less than or equal to 3, using last three+-1 in residual block as the coefficient that trails, other according to normal encoding;
When coding, there are four code tables to select, comprise a fixed length code table and three variable length code tables, respectively the different situations that may occur has been carried out to different code words and set.The code table selective dependency is in the nonzero coefficient number of adjacent coded macroblocks, according to the nonzero coefficient number of adjacent coded macroblocks, according to standard H.264, convert and obtain the nonzero coefficient number nC of this macro block again, then according to the nC span, determine corresponding code table, table look-up and encode.
Secondly, coding hangover coefficient;
Because the amplitude perseverance of hangover coefficient is 1, only need to encode and get final product its amplitude, in CAVLC, mean positive sign with 0,1 represents negative sign, encodes from the high frequency to the low frequency according to inverted order.
Again, coding nonzero coefficient;
In CALVC, meaned by amplitude except the nonzero coefficient of hangover coefficient, amplitude is comprised of two parts, is respectively prefix and suffix, the adaptive change along with each other amplitude of coding codeword level of suffix length.After first determining suffix length, the prefix of code word amplitude and suffix can have been calculated.
Again, the encode number of high frequency nonzero coefficient leading zero;
The coding use be the variable-length encoding look-up table of fixing.
Finally, the encode number of each nonzero coefficient leading zero.
Through after entropy coding, bit stream will be transferred on entropy decoder and decode, and decode procedure as shown in Figure 1, comprising:
In to bit stream entropy decode procedure, need to be according to bit stream obtain trailing coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient, the number of high frequency nonzero coefficient leading zero and the number of each nonzero coefficient leading zero.Here, when carrying out the entropy decoding, hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number are to adopt the mode entropy decoding that poll is tabled look-up to obtain, due to the encoded radio variable-length in bit stream, the simple realization of the table look-at value during therefore than coding, during the entropy decoding, need to search for corresponding whole code table, not only time-consuming, and also time delay is very large.
The explanation of giving one example, as shown in table 1, table 1 is the question blank of hangover coefficient number and nonzero coefficient number:
Table 1
When bit stream arrives entropy decoder by bit transfer, just need at first determine the nC value, and then traversal list 1 and other unshowned code stream tables, just can obtain trail coefficient number and nonzero coefficient number, time delay is larger.This finally can affect the decoding image quality of video image.With full HD, be that the 1080P60 bit stream is example, the maximum code stream decoding capability that usually can realize is 20 MBPSs (Mbps), if further improve image quality, certainly will to improve the decoding speed to bit stream, further will improve the entropy decode rate to bit stream.
Summary of the invention
In view of this, the invention provides a kind of method to the decoding of video image entropy, the method can improve the entropy decode rate to video image.
The present invention also provides a kind of device to the decoding of video image entropy, and this device can improve the entropy decode rate to video image.
For achieving the above object, technical scheme of the invention process specifically is achieved in that
A kind of method to the decoding of video image entropy comprises:
Adopt address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, is mapped on corresponding code table information;
By bit received bit stream, according to bit stream encoded radio and bit stream code length, determine address bit, by the code table information of determined address bit mapping, as the entropy decode value.
Described coding schedule sign takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether;
Code table information is 8 bits, and effectively whether 1 bit wherein for the list item value, and remaining is the entropy decode value.
By the code table information of determined address bit mapping, as the process of entropy decode value be:
List item value in the code table information of mapping while being effective, determines that the code table information of this bit stream coding mapping is the entropy decode value obtained.
Described entropy decode value is: hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number.
A kind of device to the decoding of video image entropy, comprising: mapping table arranges module and entropy decoder module, wherein,
Mapping table arranges module, and be used to adopting address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, is mapped to corresponding code table information;
The entropy decoder module, for by bit received bit stream, determine address bit according to bit stream encoded radio and bit stream code length, by the code table information of determined address bit mapping, as the entropy decode value.
Described mapping table arranges module, also for the coding schedule sign, takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether; Code table information is 8 bits, and effectively whether 1 bit wherein for the list item value, and remaining is the entropy decode value.
Described entropy decoder module, while for the list item value of code table information when mapping, being also effective, determine that the code table information of this bit stream coding mapping is the entropy decode value obtained.
Described entropy decode value is: hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number.
As can be seen from the above scheme, the present invention resets entropy decoding look-up table, adopt address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, be mapped on corresponding code table information, code table information can comprise the entropy decode value that hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and the decoding of each nonzero coefficient leading zero number constant entropy need poll to table look-up to obtain.When bit stream is decoded by the bit entropy, according to bit stream code length and bit stream encoded radio, determine corresponding address bit, according to corresponding address bit mapping, obtain code table information.Because set entropy decoding look-up table addressing space is 1024, namely adopt 10 bits that address bit is set, so carry out in the entropy decode procedure, can with 100Mbps, complete the entropy decoding of bit stream, improve the entropy decode rate to video image.
The accompanying drawing explanation
Fig. 1 is the method flow diagram that prior art is carried out the entropy decoding to the bit stream received;
Fig. 2 is provided by the invention based on the method flow diagram to the decoding of video image entropy of standard H.264;
Fig. 3 is provided by the invention based on the apparatus structure schematic diagram to the decoding of video image entropy of standard H.264.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
When entropy decoder receives bit stream, just need to carry out the entropy decoding based on standard H.264, in the entropy decode procedure, need to solve hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient, the number of high frequency nonzero coefficient leading zero and the number of each nonzero coefficient leading zero by bit.In background technology, while carrying out the entropy decoding, hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number are to adopt the mode entropy decoding that poll is tabled look-up to obtain, hangover coefficient number wherein and nonzero coefficient number are due to corresponding bit stream coding random length, so may based on code table just have a plurality of, when searching, need to further determine one in four look-up tables according to the nC value of upper macro block and left macro block and come poll to search, this will increase time delay.For the mode of tabling look-up by poll, carry out other entropy decode values of entropy decoding, also have this problem.
Because the whole entropy decoding table of search is more time-consuming, time delay is larger, in order to reduce time delay, if adopt the Content Addressable Memory (CAM) of pure hardware, realize the whole entropy decoding table of traversal fast, the variable length due to the entropy coding causes whole entropy decoding table capacity huge, causes CAM capacity and cost huge.
Therefore, the present invention resets entropy decoding look-up table, adopt address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, be mapped on corresponding code table information, code table information can comprise the entropy decode value that hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and the decoding of each nonzero coefficient leading zero number constant entropy need poll to table look-up to obtain.When bit stream is decoded by the bit entropy, according to bit stream code length and bit stream encoded radio, determine corresponding address bit, according to corresponding address bit mapping, obtain code table information.Because set entropy decoding look-up table addressing space is 1024, namely adopt 10 bits that address bit is set, so carry out in the entropy decode procedure, can with 100Mbps, complete the entropy decoding of bit stream, improve the entropy decode rate to video image.The hardware store resource that the decoding table of the present invention's structure takies is few, and cost is low.
The entropy decoding scheme key component provided in the present invention completes with lookup table mode, so the entropy decoding performance rises to internal storage access speed, can be competent at the H.264 entropy of bit stream decoding more than 100Mbps fully, thereby for performance bottleneck has been eliminated in high image quality, full HD even 4K, the decoding of 8K high definition, and the decoding of high code check high image quality is that embedded platform is incompetent.And the present invention is applied in entropy decoding scheme provided by the invention on the FPGA platform, just can break through this bottleneck.Method proposed by the invention, optimize for the characteristics that on the FPGA sheet, internal memory is few, is applicable to very much the FPGA platform and realizes.
In the present invention, when entropy decoding look-up table is set, can by bit, be shifted by bit stream, record the figure place of immigration, last four of immigration are designated as significance bit, then in conjunction with the nC value of determining, the address bit of structure entropy decoding look-up table, then correspond to this address bit on corresponding code table information.Wherein, the nC value is to calculate according to the nonzero coefficient number solved and the nonzero coefficient number of adjacent macroblocks.
Fig. 2 is provided by the invention based on the method flow diagram to the decoding of video image entropy of standard H.264, and its concrete steps are:
Here, the coding schedule sign takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether;
Code table information is 8 bits, and 1 bit wherein is the list item value searched, and remaining is concrete entropy decode value, and such as there being 2 bits to be the hangover coefficient, 5 bits are nonzero coefficient etc.;
In this step, the list item value in the code table information of mapping while being effective, determining that the code table information of this bit stream coding mapping is the entropy decode value obtained, and then receives subsequent bits stream by bit, continues to carry out according to the process of step 202.
Lift an object lesson explanation.
According to the step 201 of Fig. 2, the table of structure address bit mapping code table information is table 2:
Table 2
When entropy decoder receives bit stream by bit, the code length value is cumulative according to moving into bit number, the encoded radio of the rear four Bit Significance corresponding address positions of encoded radio, the code identification value converts and draws by agreement H.264 according to top macro block and left side macro block nC value, here the first macroblock coding is designated " 00 ", address bit has just been determined like this, table look-at can obtain the coding significance bit, when this position is ' 0 ', continue to move into H.264 bit value of the next one, when this position is ' 1 ', mean that this bit stream encoded radio is effective, table look-at obtains nonzero coefficient and hangover coefficient.
When this table 2 was set, bit rate coding length was that physical length subtracts 1.
When bit stream was " 0000000111 ", the process that entropy decoder carries out the entropy decoding was:
Move into code stream " 0 ".Coding schedule is designated " 00 ", and code length is " 0000 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 00 ".Coding schedule is designated " 00 ", and code length is " 0001 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 000 ".Coding schedule is designated " 00 ", and code length is " 0010 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 0000 ".Coding schedule is designated " 00 ", and code length is " 0011 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 00000 ".Coding schedule is designated " 00 ", and code length is " 0100 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 000000 ".Coding schedule is designated " 00 ", and code length is " 0101 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 0000000 ".Coding schedule is designated " 00 ", and code length is " 0110 ", and encoded radio is " 0000 ", and the code table information obtained is " 00000000 ";
Move into code stream " 00000001 ".Coding schedule is designated " 00 ", and code length is " 0111 ", and encoded radio is " 0001 ", and the code table information obtained is " 00000000 ";
Move into code stream " 000000011 ", coding schedule is designated " 00 ", and code length is " 1000 ", and encoded radio is " 0011 ", and the code table information obtained is " 00000000 ";
Move into code stream " 0000000111 ", coding schedule is designated " 00 ", and code length is " 1001 ", and encoded radio is " 0111 ", and the code table information obtained is " 10010000 ".
At this moment, the list item value obtained is " 1 ", shows the entropy decoding effectively, and the nonzero coefficient sum number obtained is that " 00100 " and hangover coefficient number are " 00 ".
Fig. 3 is that provided by the invention comprise: mapping table arranges module and entropy decoder module based on the apparatus structure schematic diagram to the decoding of video image entropy of standard H.264, wherein,
Mapping table arranges module, and be used to adopting address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, is mapped to corresponding code table information;
The entropy decoder module, for by bit received bit stream, determine address bit according to bit stream encoded radio and bit stream code length, by the code table information of determined address bit mapping, as the entropy decode value.
In this device, mapping table arranges module, also for the coding schedule sign, takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether; Code table information is 8 bits, and 1 bit wherein is the list item value searched, and remaining is concrete entropy decode value.
In this device, the entropy decoder module, while for the list item value of code table information when mapping, being also effective, determine that the code table information of this bit stream coding mapping is the entropy decode value obtained, and then receive subsequent bits stream by bit, according to said process, continue to carry out.
In this device, described entropy decode value is hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number.
Above act preferred embodiment; the purpose, technical solutions and advantages of the present invention are further described; institute is understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any modification of doing, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the method to the decoding of video image entropy, is characterized in that, comprising:
Adopt address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, is mapped on corresponding code table information;
By bit received bit stream, according to bit stream encoded radio and bit stream code length, determine address bit, by the code table information of determined address bit mapping, as the entropy decode value.
2. the method for claim 1, is characterized in that, described coding schedule sign takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether;
Code table information is 8 bits, and effectively whether 1 bit wherein for the list item value, and remaining is the entropy decode value.
3. method as claimed in claim 2, is characterized in that, by the code table information of determined address bit mapping, as the process of entropy decode value is:
List item value in the code table information of mapping while being effective, determines that the code table information of this bit stream coding mapping is the entropy decode value obtained.
4. method as claimed in claim 1 or 2, is characterized in that, described entropy decode value is: hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number.
5. the device to the decoding of video image entropy, is characterized in that, comprising: mapping table arranges module and entropy decoder module, wherein,
Mapping table arranges module, and be used to adopting address bit mapping code table information, address bit is determined by coding schedule sign, bit stream encoded radio and bit stream code length, is mapped to corresponding code table information;
The entropy decoder module, for by bit received bit stream, determine address bit according to bit stream encoded radio and bit stream code length, by the code table information of determined address bit mapping, as the entropy decode value.
6. device as claimed in claim 5, is characterized in that, described mapping table arranges module, also for the coding schedule sign, takies 2 bits, and the bit stream encoded radio takies 4 bits, and the bit stream code length takies 4 bits, and address bit adopts 10 bits to form altogether; Code table information is 8 bits, and effectively whether 1 bit wherein for the list item value, and remaining is the entropy decode value.
7. device as claimed in claim 6, is characterized in that, described entropy decoder module, while for the list item value of code table information when mapping, being also effective, determines that the code table information of this bit stream coding mapping is the entropy decode value obtained.
8. as claim 5,6 or 7 described devices, it is characterized in that, described entropy decode value is: hangover coefficient number, nonzero coefficient number, hangover coefficient, nonzero coefficient and each nonzero coefficient leading zero number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310328822.8A CN103414897B (en) | 2013-07-31 | 2013-07-31 | To method and the device of the decoding of video image entropy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310328822.8A CN103414897B (en) | 2013-07-31 | 2013-07-31 | To method and the device of the decoding of video image entropy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103414897A true CN103414897A (en) | 2013-11-27 |
| CN103414897B CN103414897B (en) | 2016-05-18 |
Family
ID=49607879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310328822.8A Expired - Fee Related CN103414897B (en) | 2013-07-31 | 2013-07-31 | To method and the device of the decoding of video image entropy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103414897B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1825963A (en) * | 2006-02-13 | 2006-08-30 | 清华大学 | Adaptive variable length decoding method based on text |
| CN101370138A (en) * | 2007-08-17 | 2009-02-18 | 中国科学院计算技术研究所 | Decoding method for H.264 standard CAVLC residual error coefficient |
| CN101500159A (en) * | 2008-01-31 | 2009-08-05 | 华为技术有限公司 | Method and apparatus for image entropy encoding, entropy decoding |
| CN102238387A (en) * | 2011-05-25 | 2011-11-09 | 深圳市融创天下科技股份有限公司 | Video entropy code as well as entropy coding method, device and medium |
| CN102547260A (en) * | 2010-12-22 | 2012-07-04 | 联芯科技有限公司 | Decoding method of adaptive variable length coding based on context and system thereof |
| CN102710937A (en) * | 2011-06-02 | 2012-10-03 | 龙芯中科技术有限公司 | Entropy decoding device and method for realizing CAVLC (context-based adaptive variable length coding) of H.246 |
-
2013
- 2013-07-31 CN CN201310328822.8A patent/CN103414897B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1825963A (en) * | 2006-02-13 | 2006-08-30 | 清华大学 | Adaptive variable length decoding method based on text |
| CN101370138A (en) * | 2007-08-17 | 2009-02-18 | 中国科学院计算技术研究所 | Decoding method for H.264 standard CAVLC residual error coefficient |
| CN101500159A (en) * | 2008-01-31 | 2009-08-05 | 华为技术有限公司 | Method and apparatus for image entropy encoding, entropy decoding |
| CN102547260A (en) * | 2010-12-22 | 2012-07-04 | 联芯科技有限公司 | Decoding method of adaptive variable length coding based on context and system thereof |
| CN102238387A (en) * | 2011-05-25 | 2011-11-09 | 深圳市融创天下科技股份有限公司 | Video entropy code as well as entropy coding method, device and medium |
| CN102710937A (en) * | 2011-06-02 | 2012-10-03 | 龙芯中科技术有限公司 | Entropy decoding device and method for realizing CAVLC (context-based adaptive variable length coding) of H.246 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103414897B (en) | 2016-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2571509C2 (en) | Encoding transform coefficients for video coding | |
| TWI657692B (en) | Rice parameter initialization for coefficient level coding in video coding process | |
| CN104040900A (en) | Number of contexts reduction for context adaptive binary arithmetic coding | |
| JP2019515580A (en) | Neighbor based signaling in intra prediction mode | |
| CN104221380A (en) | Common spatial candidate blocks for parallel motion estimation | |
| CN103718554A (en) | Coding of transform coefficients for video coding | |
| CN104396247A (en) | Lcu-based adaptive loop filtering for video coding | |
| CN104160702A (en) | Video coding with network abstraction layer units that include multiple encoded picture partitions | |
| CN103430539A (en) | Decoded picture buffer management | |
| CN104025603A (en) | Progressive coding of position of last significant coefficient | |
| CN103609112A (en) | Internal bit depth increase in video coding | |
| CN104054341A (en) | Throughput improvement for CABAC coefficient level coding | |
| CN104067524A (en) | Context adaptive entropy coding with a reduced initialization value set | |
| CN104054347A (en) | Indication of use of wavefront parallel processing in video coding | |
| CN103609118A (en) | Parallelization friendly merge candidates for video coding | |
| EP2596634A1 (en) | Video compression using multiple variable length coding methods for multiple types of transform coefficient blocks | |
| CN103609123A (en) | Unified merge mode and adaptive motion vector prediction mode candidates selection | |
| JP2014533048A (en) | Adaptive centerband offset filter for video coding | |
| CN103141100A (en) | Intra smoothing filter for video coding | |
| CN103430542A (en) | Video coding techniques for coding dependent pictures after random access | |
| CN103959779A (en) | Largest coding unit (LCU) or partition-based syntax for adaptive loop filter and sample adaptive offset in video coding | |
| CN103988505A (en) | Constrained reference picture sets in wave front parallel processing of video data | |
| CN105122798A (en) | Indication of cross-layer picture type alignment in multi-layer video coding | |
| CN104380748A (en) | Grouping of bypass-coded bins for SAO syntax elements | |
| CN104205832A (en) | Group flag in transform coefficient coding for video coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 100083 Beijing City, Haidian District Xueyuan Road No. 30 Fangxing building room 1002 Applicant after: VORX TELECOMMUNICATIONS Co.,Ltd. Address before: 100083 Beijing City, Haidian District Xueyuan Road No. 30 Fangxing building room 1002 Applicant before: Beijing Vorx Telecommunications Co.,Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: BEIJING VORX TELECOMMUNICATIONS CO., LTD. TO: BEIJING VORX TELECOM TECHNOLOGY CO., LTD. |
|
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 100093 Beijing city Haidian District minzhuang Road No. 3 Building No. 5 Yuquan Huigu Tsinghua Science Park on the ground floor on the west side of room 101 Applicant after: VORX TELECOMMUNICATIONS Co.,Ltd. Address before: 100083 Beijing City, Haidian District Xueyuan Road No. 30 Fangxing building room 1002 Applicant before: VORX TELECOMMUNICATIONS Co.,Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190902 Address after: 100093 Beijing city Haidian District minzhuang Road No. 3 Building No. 5 Yuquan Huigu Tsinghua Science Park on the ground floor on the west side of room 101 Co-patentee after: BEIJING VORXSOFT TECHNOLOGY Co.,Ltd. Patentee after: VORX TELECOMMUNICATIONS Co.,Ltd. Address before: 100093 Beijing city Haidian District minzhuang Road No. 3 Building No. 5 Yuquan Huigu Tsinghua Science Park on the ground floor on the west side of room 101 Patentee before: VORX TELECOMMUNICATIONS Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20210731 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |