CN104093026B

CN104093026B - Decoding method and device

Info

Publication number: CN104093026B
Application number: CN201410190311.9A
Authority: CN
Inventors: 杨海涛; 李斌; 李厚强; 周建同
Original assignee: University of Science and Technology of China USTC; Huawei Technologies Co Ltd
Current assignee: University of Science and Technology of China USTC; Huawei Technologies Co Ltd
Priority date: 2012-01-20
Filing date: 2012-01-20
Publication date: 2018-04-10
Anticipated expiration: 2032-01-20
Also published as: CN104093026A

Abstract

The embodiments of the invention provide a kind of decoding method and device.Method includes：Extract the first information in code stream；According to the first information, chromatic component intra prediction mode is determined；When not can determine that chromatic component intra prediction mode according to the first information, the second information in code stream is extracted；Chromatic component intra prediction mode is determined according to the second information, wherein the first information include be used for indicate chromatic component intra prediction mode whether be DM patterns or LM patterns information, second information is used to indicate the pattern of surplus as chromatic component intra prediction mode, and pattern of surplus is that can be used for one of chromatic component intra prediction mode in addition to the pattern that the first information may determine.Device includes the first extraction unit, the first determining unit, the second extraction unit and the second determining unit.Above-mentioned technical proposal can reduce the coding information of chroma mode and Optimal scheduling, so as to reduce encoding and decoding step, thus reduces the complexity of encoding and decoding, improves the efficiency of decoding.

Description

Decoding method and device

Technical field

The present invention relates to field of video image processing, and more particularly, to decoding method and device.

Background technology

Existing video image encoding and decoding technology includes intra-frame coding techniques and inter-frame coding.Intraframe coding refers to only sharp The technology of coding is compressed to picture material with the spatial coherence in current encoded image.Interframe encode refers to be compiled using current The temporal correlation of code image and encoded image is compressed the technology of coding to present image.Compiled to improve in the frame of image Code efficiency, H.264/AVC (Advanced Video Coding, advanced Video coding) standard be firstly introduced infra-frame prediction skill Art removes the spatial information redundancy of current encoded image block and neighbouring encoded image block.Therefore, with intraframe coding before Technology is different, H.264/AVC only needs, to prediction difference signal rather than original image signal, to carry out spatial alternation and entropy code, So as to improve intraframe coding efficiency.

Video signal generally includes a luminance component and two chromatic components.HEVC(High Efficiency Video Coding, efficient video coding) scheme is the Video coding mark of new generation studied of present international standards tissue Quasi-ization scheme, it inherits the intraframe predictive coding technology in H.264/AVC standard, and introduces new frame for chromatic component Inner estimation mode LM patterns.When using LM patterns, the chromatic component predicted value of image block, by by the luminance component weight of corresponding blocks The reconstructed value of sampling is calculated by linear model.Therefore, LM patterns are different from traditional directional intra prediction pattern, it Using the correlation of picture carrier component and chromatic component, the method that chromatic component value is predicted using luma component values.

HEVC schemes inherit the intraframe predictive coding technology in H.264/AVC standard and are extended.Wherein image block All optional intra prediction mode predicted composition set of modes of chromatic component, including following 6 kinds of predictive modes：

DM patterns：Intra prediction mode using the luminance component of current block is used as the predictive mode of chromatic component, progress Prediction；

LM patterns：The predicted value of chromatic component, linear mould are calculated with the value of sampled point point luminance component based on linear model Shape parameter is calculated by the luma component values of the neighbouring sampled point of current block with chromatic component value；

DC patterns：The average value of the value of the chromatic component of the sampled point neighbouring using current block is used as current block chromatic component Predicted value；

Plane (English is Planar) pattern：Hypothesis based on the value of sampled point in spatial linear smooth change calculates currently The predicted value of block sampled point；

Horizontal pattern：Using directly to the left adjacent to sampled point chromatic component value as current block with all sampled points in a line The predicted value of chromatic component；

Vertical pattern：The value of neighbouring sampled point chromatic component is as all sampled points in current block same row directly over using The predicted value of chromatic component.

TU (Truncated Unary, block unitary) code scheme is used to the above-mentioned predictive mode of colourity in correlation technique Encoding and decoding are carried out, the complexity of encoding and decoding is high, and decoding efficiency is low.

The content of the invention

The embodiment of the present invention provides a kind of decoding method and device, and encoding and decoding answers when can reduce Computer Vision Miscellaneous degree, improve decoding efficiency.

On the one hand, there is provided a kind of decoding method, including：Extract the first information in code stream；According to the first information, really Fixation degree component intra prediction mode；When not can determine that chromatic component intra prediction mode according to the first information, code stream is extracted In the second information；Chromatic component intra prediction mode is determined according to the second information, the wherein first information includes being used to indicate color Degree component intra prediction mode whether be DM patterns or LM patterns information, the second information is used to indicate as in chromatic component frame The pattern of surplus of predictive mode, pattern of surplus are that can be used in addition to the pattern that the first information may determine in chromatic component frame in advance One of survey pattern.

On the other hand, there is provided a kind of device of encoding and decoding, including the first extraction unit, the first determining unit, second carry Unit and the second determining unit are taken, wherein the first extraction unit, for extracting the first information in code stream；First determining unit, The first information for being extracted according to the first extraction unit determines chromatic component intra prediction mode；Second extraction unit, is used for When the first determining unit not can determine that chromatic component intra prediction mode according to the first information, the second letter in code stream is extracted Breath；With the second determining unit, the second information for being extracted according to the second extraction unit determines chromatic component intra prediction mode, Wherein the first information include be used for indicate chromatic component intra prediction mode whether be DM patterns or LM patterns information, second letter Cease for indicating the pattern of surplus as chromatic component intra prediction mode, pattern of surplus is the mould that may determine except the first information It can be used for one of chromatic component intra prediction mode outside formula.

Above-mentioned technical proposal can reduce the coding information of chroma mode and Optimal scheduling, so as to reduce encoding and decoding step Suddenly, the complexity of encoding and decoding is thus reduced, improves the efficiency of decoding.

Brief description of the drawings

In order to illustrate the technical solution of the embodiments of the present invention more clearly, it will make below to required in the embodiment of the present invention Accompanying drawing is briefly described, it should be apparent that, drawings described below is only some embodiments of the present invention, for For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings Accompanying drawing.

Fig. 1 is the schematic flow diagram of the decoding method of one embodiment of the invention.

Fig. 2 is the schematic flow diagram of the decoding method of another embodiment of the present invention.

Fig. 3 is the schematic flow diagram of one embodiment of the invention.

Fig. 4 is the schematic flow diagram of another embodiment of the present invention.

Fig. 5 is the schematic block diagram of the coding and decoding device of the embodiment of the present invention.

Fig. 6 is the schematic block diagram of another device of encoding and decoding of the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is the part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained on the premise of creative work is not made Example is applied, should all belong to the scope of protection of the invention.

The terms "and/or", only a kind of incidence relation for describing affiliated partner, expression may have three kinds of passes System, for example, A and/or B, can be represented：Individualism A, while A and B be present, these three situations of individualism B.In addition, herein Middle character "/", it is a kind of relation of "or" to typically represent forward-backward correlation object.

Chromatic component in the embodiment of the present invention can refer to any individual chromatic component in two chromatic components.Wherein HEVC Chromatic component intra prediction mode in DC patterns, vertical pattern, horizontal pattern and plane mode and H.264/AVC standard In associative mode general principle it is identical, specific implementation method is different.LM patterns and DM patterns are the two kinds of moulds newly added Formula.In addition to above-mentioned predictive mode, an also alternative patterns.If DM patterns are identical with remaining predictive mode in predictive mode set When, then using alternative patterns replacement and DM pattern identical prediction mode for chroma, so as to form new predictive mode set.Wherein DM patterns are predicted using the predictive mode of intra prediction mode as the chromatic component of the luminance component of current block.Therefore, The intra prediction mode of luminance component and remaining predictive mode in predictive mode set can also be equivalently determined in the above method It is whether identical.The predictive mode that alternative patterns can be with all patterns differ in chromatic component predictive mode set.

In the different embodiments of this patent, the set of chromatic component predictive mode may be different.A kind of available chromatic component Predictive mode set includes DM patterns, LM patterns, DC patterns, vertical pattern, horizontal pattern and plane mode.Another kind is available The set of chromatic component predictive mode include DM patterns, DC patterns, vertical pattern, horizontal pattern and plane mode.It is another Available chromatic component predictive mode set includes DM patterns, LM patterns and default mode.Another available chromatic component Predictive mode set includes DM patterns and default mode.

LM patterns in above-mentioned pattern are in current HEVC schemes can selecting technology.In HE (High Efficiency, height Effect) encode under configuration condition, chroma intra prediction modes can include LM patterns in lectotype, and now predictive mode set includes 6 Kind predictive mode；But in the case where LC (Low Complexity, low complex degree) encodes configuration condition, chroma intra prediction modes are optional LM patterns are not included in pattern, now predictive mode set includes 5 kinds of predictive modes.In current HEVC schemes, LM whether be Can a binary character (flag) decision of the lectotype in code stream.

The chroma coder scheme carries out binaryzation using TU (Truncated Unary) codes to the pattern information of current block, To the binary character after binaryzation, using CABAC, (Context Cased Binary Arithmetic Coding, are based on again Context binary arithmetic coding) technology progress entropy code.For example, under HE configuration conditions, DM, LM are vertically, horizontal, DC with 6 kinds of patterns of plane can be represented using TU code words 0,10,110,1110,11110,11111 respectively；Under LC configuration conditions, DM, erect Directly, horizontal, DC can be represented using TU code words 0,10,110,1110,1111 respectively with 5 kinds of patterns of plane.Decoding end is then according to solution Analyse the predictive mode that obtained TU code words determine current block chromatic component.

In fact, TU code words are considered as the series connection of one group of binary character, during entropy code or entropy decoding then according to The secondary value according to each binary character judges whether to continue to encode or decode follow-up binary character.In addition, TU codes Each binary character represents the judgement of a binaryzation in word.For example, in the case where LC encodes configuration condition, using maximum For 5 TU codes, i.e., contain up to 4 binary characters in the TU codes.Wherein, the 1st binary character is used to determine current block Pattern whether be DM patterns, the 2nd binary character is used to determining whether the pattern of current block to be vertical pattern, the 3rd two Hex notation is used to determine whether the pattern of current block to be horizontal pattern, and the 4th binary character is used for the mould for determining current block Whether formula is DC patterns.If not above-mentioned four kinds of patterns, then must be plane mode.

, it is necessary to according to previous binary system during using TU code words to the progress encoding and decoding of chromatic component intraprediction mode information The value of symbol decides whether to encode or decodes next binary character.The coding of this conditionity or decoding add entropy The complexity of coding or entropy decoding.

DM patterns are very high from ratio, and it reduce the importance of other patterns outside DM.And DM patterns and plane mode, DC Pattern, horizontal pattern are possible to identical with vertical pattern, and this illustrates larger redundancy be present in optional set of modes, and this superfluous It is remaining to influence video image compression efficiency；

Optional pattern quantity is more, have under the conditions of HE 6 kinds can lectotype, have under the conditions of LC 5 kinds can lectotype.This meeting Increase the computation complexity of coding side mode selection processes.

The embodiments of the invention provide a kind of decoding method, can solve the above problems.

Fig. 1 is the schematic flow diagram of the decoding method 10 of one embodiment of the invention, including herein below.

11, extract the first information in code stream.

The first information include be used for indicate chromatic component intra prediction mode whether be DM patterns or LM patterns information.

12, according to the first information, determine chromatic component intra prediction mode.

13, when not can determine that chromatic component intra prediction mode according to the first information, extract second in the code stream Information.

14, the chromatic component intra prediction mode is determined according to second information.

Second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode, and the pattern of surplus is It can be used for one of chromatic component intra prediction mode in addition to the pattern that the first information may determine.

Pattern of surplus can be the pattern that be may determine in chromatic component intra prediction mode set except the first information Outside one of pattern.If for example, the first information be used for determine chromatic component intra prediction mode whether be DM patterns or LM patterns, then the pattern of surplus can be the mould in chromatic component intra prediction mode set in addition to DM patterns and LM patterns One of formula.

For when luminance component intra prediction mode and used chromatic component intra prediction mode are mutually at the same time it can also making The chromatic component intra prediction mode is replaced with alternative patterns, the alternative patterns are and chromatic component intra prediction mode collection One of different pattern of pattern in conjunction..

The embodiment of the present invention can reduce the coding information of chroma mode and Optimal scheduling, so as to reduce encoding and decoding step Suddenly, the complexity of encoding and decoding is thus reduced, improves the efficiency of decoding.

Fig. 2 is the schematic flow diagram of the decoding method 20 of another embodiment of the present invention, including herein below.

21, extract the first information in code stream.

The first information include be used for indicate chromatic component intra prediction mode whether be DM patterns or LM patterns information.The One information can include one or two sub-information carried by binary character.The TU codes that 2 can also be up to by one are taken The band first information.

22, determine whether chromatic component intra prediction mode is DM patterns by the first information.

When being defined as DM patterns, i.e. "Yes", step 23 is performed, chromatic component infra-frame prediction mould is used as using DM patterns Formula.

When being defined as non-DM patterns, i.e. "No", optionally, step 24 is performed, confirm chromatic component intra prediction mode Whether include LM patterns in set, confirmation method is compared with technology.

When it is determined that set includes LM patterns, i.e. "Yes", step 25 is performed.

25, determine whether chromatic component intra prediction mode is LM patterns by the first information.

When being defined as LM patterns, i.e. "Yes", step 26 is performed, chromatic component infra-frame prediction mould is used as using LM patterns Formula.

When being defined as non-LM patterns, i.e. "No", step 27 is performed.

After step 24 is performed, it is determined that when set does not include LM patterns, i.e. "No", it is same to perform step 27.

27, extract the second information in code stream.

28, by the second information, pattern of surplus is determined, chromatic component infra-frame prediction mould is used as using the pattern of surplus Formula.

Pattern of surplus can be the pattern that be may determine in chromatic component intra prediction mode set except the first information Outside one of pattern.For example, the first information is used for whether determining chromatic component intra prediction mode in the present embodiment For DM patterns or LM patterns, then the pattern of surplus can be to remove DM patterns and LM moulds in chromatic component intra prediction mode set Any one of 4 kinds of patterns outside formula.It is specially that second information can carry the pattern of surplus for which coding information.4 kinds The coding information of pattern can be carried using FL codes, and each of which pattern is established with a FL code corresponding relation.

Step 29, whether chromatic component intra prediction mode and the luminance component intra prediction mode determined when abovementioned steps It is identical.

If identical, i.e. "Yes", then step 30 is performed, it is determined that being used as chromatic component infra-frame prediction mould using alternative patterns Formula.Wherein alternative patterns are one of patterns different from the pattern in chromatic component intra prediction mode set.

If it is not the same, i.e. "No", then perform step 31, determine that chromatic component intra prediction mode keeps constant.

As a kind of implementation, step 32 can be with step of replacing 27 and 28.

As another implementation, step 29 is optional, and step 31 can be directly performed after step 32 or step 28.

32, using default mode as chromatic component intra prediction mode, wherein the default mode is set in advance One of luminance component intra prediction mode.

In above-mentioned technical proposal, for the different technologies of use, such as carrying mode of information etc., the multiple steps of the above can To merge, or a step is divided into multistep completion, and the present invention is not limited to this, and the implementation should all cover at this Within the protection domain of invention.

Chromatic component intra prediction mode and luminance component intra prediction mode are both for current block, therefore in following reality Apply and current block chroma mode and current block luminance patterns are briefly referred to as in example, be generally also briefly referred to as chroma mode and brightness Pattern.Pattern in specification in the set of luminance component intra prediction mode is typically more than the mould in chromatic component intra prediction mode Formula.Fig. 3 is the schematic flow diagram of one embodiment of the invention 300.

In embodiments of the present invention, the first information is carried using binary character.The first information can be including the use of one Individual binary character represent current block chroma mode whether be DM patterns information, be denoted as DM information.

The first information can also represent whether current block chroma mode is LM patterns including the use of a binary character Information, it is denoted as LM information.If LM patterns be not in chromatic component intra prediction mode can lectotype, be not in code stream LM information, also LM information will not be encoded with decoding end for coding side and decoding operate.

Second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode, and the pattern of surplus is It can be used for one of chromatic component intra prediction mode in addition to the pattern that the first information may determine.It can use FL (Fix Length, fixed length) code word that length is 2 represents the second information.The pattern of surplus can be vertical, horizontal, DC with 4 patterns of plane.Such as this 4 patterns can be represented respectively with FL code words 00,01,10,11.

When carrying out entropy decoding to the DM information, a context mould can also be used without using context model Type, a context model can also be selected from multiple context models according to the coding information of contiguous block.

When carrying out entropy decoding to the LM information, a context mould can also be used without using context model Type, a context model can also be selected from multiple context models according to the coding information of contiguous block.

Without using context model during to second information progress entropy decoding.In other words, using by-pass (equiprobability) The FL code words that pattern one length of entropy decoding from code stream is 2, and the pattern according to corresponding to FL code words determination is as described above. It is possible thereby to improve the handling capacity of entropy decoding.The by-pass patterns are the binary system entropy code or entropy without using probabilistic model Decoding schema.In other words, by-pass patterns assume current entropy code or entropy decoding binary character be 0 or be 1 probability phase Deng.

It should be noted that it is prior art to carry out decoding to a binary character without using context model, i.e., By-pass patterns in CABAC technologies.It is existing skill to carry out decoding to a binary character using a context model First binary character in art, such as HEVC brightness frame mode coding and decoding scheme is exactly using this entropy decoding side Method.It is prior art that a context model is selected from multiple context models according to the coding information of contiguous block, such as Skip mode mark (English is skip flag) in HEVC schemes is exactly using this entropy decoding method.Therefore to above-mentioned three The details of kind entropy decoding method repeats no more.

Embodiment 300 includes herein below.

310, DM information is extracted from code stream using the entropy decoding method of foregoing description.If current block is determined according to DM information Chroma mode is DM patterns, then terminates the pattern and determine flow；Otherwise step 320 is performed.

320, LM information is extracted from code stream using the entropy decoding method of foregoing description.If current block is determined according to LM information Chroma mode is LM patterns, then terminates the pattern and determine flow；Otherwise step 330 is performed.

Be not in LM in code stream it should be noted that if chroma intra prediction can not include LM patterns in lectotype Information.Decoding end can skip the step without carrying out the parsing operation.It can be confirmed by prior art in chrominance frames Whether prediction can include LM patterns in lectotype.

330, the second information is extracted from code stream using the entropy decoding method of foregoing description.Second information is the length Spend the FL code words for 2.

340, pattern of surplus information is determined according to the second information, and use the pattern of surplus as current block colourity mould Formula.

Current block chroma mode is determined according to the corresponding relation of FL code words and pattern of surplus.A kind of available corresponding relation is such as It is upper described.

Optionally, if current block luminance patterns and the current block chroma mode determined according to the method described above from pattern of surplus Current block chroma mode that is identical, then being used using alternative patterns step of replacing 340.It can select in one and chromatic component frame The different pattern of pattern in predictive mode set is as the alternative patterns.For example, the optional side along upper right lower left Tropism predictive mode is as the alternative patterns.Current block luminance patterns are worked as with what is determined according to the method described above from pattern of surplus Preceding piece of chroma mode differs, then the current block chroma mode that step 340 uses keeps constant.

It is determined that after current block chroma mode, then it can terminate the pattern and determine flow.

In addition, to remove the redundancy in the optional predictive mode of chromatic component, optionally, colourity used in the present embodiment point Measure optional predictive mode set and only include three kinds of chromatic component predictive modes, i.e. DM patterns, LM patterns and default mode.In the feelings Under condition, step 360 step of replacing 330 and 340 can also be used, other steps keep constant.Abovementioned steps are now passed through Learn that current block chroma mode is not DM patterns nor LM patterns.Default mode can be luminance component frame set in advance One of inner estimation mode.

360, it is used as current block chroma mode using default mode.

Fig. 4 is the schematic flow diagram of another embodiment of the present invention 40.Unlike embodiment 300, a maximum is used It is worth and carries the first information for 2 TU code words, for represents whether current block chroma mode is DM patterns or LM patterns.The TU code words Can be 0,10,11.These three code words can represent that current block chroma mode is DM patterns respectively, and current block chroma mode is LM moulds Formula, and current block chroma mode neither DM patterns nor LM patterns, i.e. current block be pattern of surplus set in one kind. It should be noted that if chroma intra prediction can not include LM patterns in lectotype, the TU code words deteriorate to a binary system Symbol, the binary character represent whether current block chroma mode is DM patterns.

It is same to carry the second information using FL (Fix Length, fixed length) code word that length is 2, to represent colorimetric prediction mould Pattern of surplus in formula.The method of other such as entropy decodings is identical with embodiment 300.

41, by extract the expression current block chroma mode whether be DM patterns or LM patterns TU code words, confirm to work as Preceding piece of chroma mode.

The TU code words that a maximum is 2 are extracted from code stream using the entropy decoding method described by embodiment 300.If root Determine that current block chroma mode is DM patterns according to the TU code words, then terminate the pattern and determine flow；If determined according to the TU code words Current block chroma mode is LM patterns, then terminates the pattern and determine flow；Otherwise, current block colourity mould is determined according to the TU code words Formula is neither DM patterns, nor LM patterns, perform step 42.

It should be noted that if chroma intra prediction can not include LM patterns in lectotype, institute is not parsed from code stream State maximum and be 2 TU code words, but extract a binary character from code stream according to the method in embodiment 300.If root Determine that current block chroma mode is DM patterns according to the binary character, then terminate the pattern and determine flow；Otherwise step 42 is performed.

42, extract the second information.

It is similar to step 330, the second information is extracted from code stream using the entropy decoding method described in embodiment 300.Institute State the FL code words that the i.e. described length of the second information is 2.

43, pattern of surplus is determined according to the second information, and use the pattern of surplus as current block chroma mode.

It is similar to the 340 of embodiment 300, current block colourity mould is determined according to the corresponding relation of FL code words and pattern of surplus Formula.A kind of available corresponding relation is as described above.

Optionally, step 44, if current block luminance patterns and the current block determined according to the method described above from pattern of surplus Chroma mode is identical, then the current block chroma mode used using alternative patterns step of replacing 43.One can be selected with owning The different pattern of pattern in chromatic component intra prediction mode set is as the alternative patterns.It is for example, optional along upper right side The directional prediction pattern of lower section is as the alternative patterns to the left.Current block luminance patterns with according to the method described above from residual mode The current block chroma mode determined in formula differs, then the current block chroma mode that step 43 uses keeps constant.

In addition, it is similar with embodiment 300, to remove the redundancy in the optional predictive mode of chromatic component, optionally, this implementation The optional predictive mode set of chromatic component used in example can also only include three kinds of chromatic component predictive modes, i.e., DM patterns, LM patterns and default mode.Correspondingly, as shown in figure 4, step 45 step of replacing 42 and 43 can also be used, other steps are kept It is constant, now learn that current block chroma mode is not DM patterns nor LM patterns by abovementioned steps.

45, it is used as current block chroma mode using default mode.

Fig. 5 is the schematic block diagram of the device 50 of encoding and decoding according to embodiments of the present invention.The first extraction that device 50 includes The confirmation unit 52 of unit 51 and first, the second extraction unit 53 and the second confirmation unit 54.

The first information in first extraction unit 51 extraction code stream.

The first information that first determining unit 52 is extracted according to the first extraction unit 51 determines chromatic component infra-frame prediction mould Formula.

Second extraction unit 53 is when first determining unit 51 is according to the first information, it is impossible to determines pre- in chromatic component frame During survey pattern, the second information in the code stream is extracted.

Second information that second determining unit 54 is extracted according to second extraction unit 53 determines the colourity point Measure intra prediction mode.

Device 50 realizes method 20 and 300, and here is omitted for detail.

In addition, it is optional, carried when the first information of the first extraction unit 51 extraction includes a binary character DM information, wherein the DM information is used to indicate whether the chromatic component intra prediction mode is DM patterns, described first Determining unit 52 is specifically used for when it is determined that the DM information instruction chromatic component intra prediction mode is DM patterns, then making Chromatic component intra prediction mode is used as by the use of DM patterns.

Optionally, when the first information of the first extraction unit 51 extraction includes the DM letters of a binary character carrying Breath, wherein the DM information is used to indicate whether the chromatic component intra prediction mode is DM patterns, described first determines list Member 52 is specifically used for when it is determined that the DM information instruction chromatic component intra prediction mode is non-DM patterns, then using scarce Province's pattern is as chromatic component intra prediction mode, wherein the default mode is luminance component infra-frame prediction mould set in advance One of formula.

Optionally, when the first information of first extraction unit 51 extraction includes what a binary character carried DM information, wherein when the DM information is used for whether indicate the chromatic component intra prediction mode to be DM patterns, described second Extraction unit 53 is specifically used for when first determining unit 52 determines that the DM information indicates the chromatic component infra-frame prediction When pattern is non-DM patterns, then the second information in the code stream is extracted, and second determining unit 54 is specifically used for basis Second information that second extraction unit 51 extracts determines the chromatic component intra prediction mode.

Optionally, when the DM information of the first information of first extraction unit 51 extraction is indicated in the chromatic component frame Predictive mode is non-DM patterns, and the first information also includes the LM information that a binary character carries, wherein the LM Information is used to indicate whether the chromatic component intra prediction mode is LM patterns, then first determining unit 52 is specifically used for When it is determined that the LM information instruction chromatic component intra prediction mode is LM patterns, then divided using LM patterns as colourity Measure intra prediction mode.

Optionally, when the DM information of the first information of first extraction unit 51 extraction indicates the chromatic component Intra prediction mode is non-DM patterns, and the first information also includes the LM information that a binary character carries, wherein institute State LM information to be used to indicate whether the chromatic component intra prediction mode is LM patterns, then first determining unit 52 is specific For when it is determined that the LM information instruction chromatic component intra prediction mode is non-LM patterns, then being made using default mode For chromatic component intra prediction mode, wherein the default mode is one of luminance component intra prediction mode set in advance.

Optionally, when the DM information of the first information of first extraction unit 51 extraction indicates the chromatic component Intra prediction mode is non-DM patterns, and the first information also includes the LM information that a binary character carries, wherein institute State LM information to be used to indicate whether the chromatic component intra prediction mode is LM patterns, then second extraction unit 53 is specific For determining that the LM information indicates that the chromatic component intra prediction mode is non-LM patterns when first determining unit 52 When, then the second information in the code stream is extracted, and second determining unit 54 is specifically used for according to the described second extraction list Second information of the extraction of member 53 determines the chromatic component intra prediction mode.

Optionally, when first extraction unit 51 extract by a maximum be 2 block unitary (TU) code carrying The first information, then first determining unit 52, which is specifically used for working as, determines the TU codes instruction chromatic component infra-frame prediction mould When formula is DM patterns, then chromatic component intra prediction mode is used as using DM patterns

Optionally, when first extraction unit specific 5 is extracted by described the first of the TU codes carrying that a maximum is 2 Information, then first determining unit 52, which is specifically used for working as, determines that the TU codes instruction chromatic component intra prediction mode is LM moulds During formula, then chromatic component intra prediction mode is used as using LM patterns.

Optionally, when first extraction unit 51 extracts first letter carried by the TU codes that a maximum is 2 Breath, then first determining unit 52 be specifically used for when determining TU codes instruction chromatic component intra prediction mode neither DM Pattern is nor during LM patterns, then using default mode as the chromatic component intra prediction mode, wherein the default mould Formula is one of luminance component intra prediction mode set in advance.

Optionally, when first extraction unit 51 extracts first letter carried by the TU codes that a maximum is 2 Breath, then second extraction unit 53 when first determining unit 52 specifically for determining the TU codes instruction chromatic component frame Inner estimation mode is and described second true neither DM patterns nor during LM patterns, then extract the second information in the code stream Order member 54 is specifically used for determining the chromatic component using second information extracted according to second extraction unit 53 Intra prediction mode.

Optionally, when first extraction unit 51 extracts second information carried by fixed length (FL) code, then Second determining unit 53 is specifically used for determining pattern of surplus by the FL codes, and uses the pattern of surplus as colourity Component intra prediction mode.Wherein, first extraction unit 51 can be by equiprobability (by-pass) schema extraction by one Second information that FL codes carry.

Fig. 6 is the schematic block diagram of another device 60 of encoding and decoding according to embodiments of the present invention.As a kind of implementation Device 60 includes the first extraction unit 61, the first confirmation unit 62, the second extraction unit 63, the second confirmation unit 64, with device 50 the first extraction unit 51, the first confirmation unit 52, the second extraction unit 53, the second confirmation unit 54 are same or similar, no Same is that can also include the 3rd confirmation unit 65 and/or the 4th confirmation unit 66.

The first information in first extraction unit 61 extraction code stream.

The first information that first determining unit 62 is extracted according to the first extraction unit 61 determines chromatic component infra-frame prediction mould Formula.

Second extraction unit 63 is when first determining unit 61 is according to the first information, it is impossible to determines pre- in chromatic component frame During survey pattern, the second information in the code stream is extracted, and

Second information that second determining unit 64 is extracted according to second extraction unit 63 determines the colourity point Measure intra prediction mode.

3rd determining unit 65 determines whether the set of chromatic component intra prediction mode includes LM patterns.

When the 3rd determining unit 65 determines that the set of chromatic component intra prediction mode does not include LM patterns, described the The first information of one extraction unit 61 extraction is only included for indicating whether the chromatic component intra prediction mode is DM The information of pattern.Or when the 3rd determining unit 65 determines that the set of chromatic component intra prediction mode includes LM patterns, The first information that first extraction unit 61 extracts includes being used for whether indicating the chromatic component intra prediction mode For DM patterns or the information of LM patterns.

4th determining unit 66 is when the identified chromatic component intra prediction mode neither DM patterns are nor LM During pattern, determine whether luminance component intra prediction mode is identical with the identified chromatic component intra prediction mode.

When the 4th determining unit 66 determines luminance component intra prediction mode and the identified chromatic component frame When inner estimation mode is identical, using alternative patterns replace determined by the chromatic component intra prediction mode, wherein described replace Mold changing formula is one of patterns different from the pattern in chromatic component intra prediction mode set.Or when the described 4th determination When unit 66 determines that luminance component intra prediction mode differs with the identified chromatic component intra prediction mode, institute is really The fixed chromatic component intra prediction mode keeps constant.

Device 60 realizes method 20 and 300, and here is omitted for detail.

Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed The scope of the present invention.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.

In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, can be with Realize by another way.For example, device embodiment described above is only schematical, for example, the unit Division, only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or The mutual coupling discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit Close or communicate to connect, can be electrical, mechanical or other forms.

The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.

If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.

Scheme provided in an embodiment of the present invention can be applied in digital processing field, pass through video encoder, solution Code device is realized.Video encoder, decoder are widely used in various communication apparatus or electronic equipment, such as：WMG, move Mobile phone, wireless device, personal digital assistant (PDA, Personal Data Assistant), hand-held or portable computing Machine, GPS (Global Positioning System, global positioning system) receiver/omniselector, camera, video playback Device, video camera, video recorder, monitoring device etc..This kind equipment includes processor, memory, and the interface of transmission data. Video Codec can be directly by digital circuit or chip such as DSP (Digital Signal Processor, data signal Processor) realize, or driven the flow in a computing device software code by software code and realized.

The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.

Claims

A kind of 1. coding/decoding method, it is characterised in that including：

Extract the first information in code stream；According to the first information, chromatic component intra prediction mode is determined；

When not can determine that chromatic component intra prediction mode according to the first information, the second letter in the code stream is extracted Breath；

The chromatic component intra prediction mode is determined according to second information, wherein

The first information includes being used to indicate whether the chromatic component intra prediction mode is DM patterns, wherein, the DM Pattern is predicted including the use of the intra prediction mode of the luminance component of current block as the predictive mode of chromatic component；

Second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode, and the pattern of surplus is It can be used for one of chromatic component intra prediction mode in addition to the pattern that the first information may determine；

It is described when not can determine that chromatic component intra prediction mode according to the first information, extract second in the code stream Information；After determining the chromatic component intra prediction mode according to second information, methods described also includes：

When the chromatic component intra prediction mode determined according to the first information is not DM patterns, institute is further determined that State the luminance component of current block intra prediction mode whether with the chromatic component frame that is determined according to second information Predictive mode is identical；

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When identical, the chromatic component intra prediction mode of the determination is replaced using alternative patterns, wherein the alternative patterns are One of pattern all different from the pattern in chromatic component intra prediction mode set,

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When differing, the chromatic component intra prediction mode of the determination keeps constant.
2. according to the method for claim 1, it is characterised in that carried when the first information includes a binary character DM information, wherein when the DM information is used for whether indicate the chromatic component intra prediction mode to be DM patterns, the side Method includes：

When it is determined that the DM information instruction chromatic component intra prediction mode is DM patterns, then color is used as using DM patterns Spend component intra prediction mode；Or

When it is determined that the DM information instruction chromatic component intra prediction mode is non-DM patterns, then made using default mode For chromatic component intra prediction mode, wherein the default mode is one of luminance component intra prediction mode set in advance； Or

When it is determined that the DM information instruction chromatic component intra prediction mode is non-DM patterns, then extract in the code stream The second information, the chromatic component intra prediction mode is determined according to second information.
3. according to the method for claim 2, it is characterised in that when the DM information of the first information indicates the colourity point Amount intra prediction mode is non-DM patterns, and the first information also includes the LM information that a binary character carries, wherein When the LM information is used for whether indicate the chromatic component intra prediction mode to be LM patterns, in the determination chromatic component frame Predictive mode includes：

When it is determined that the LM information instruction chromatic component intra prediction mode is LM patterns, then color is used as using LM patterns Spend component intra prediction mode；Or

When it is determined that the LM information indicates that the chromatic component intra prediction mode is non-LM patterns, then using default mode as Chromatic component intra prediction mode, wherein the default mode is one of luminance component intra prediction mode set in advance；Or

Determine that the LM information indicates that the chromatic component intra prediction mode is non-LM patterns, then extract the in the code stream Two information, the chromatic component intra prediction mode is determined according to second information.
4. according to the method described in claim any one of 1-3, it is characterised in that when being 2 to block unitary by maximum When TU codes carry the first information, the determination chromatic component intra prediction mode includes：

When it is determined that TU codes instruction chromatic component intra prediction mode is DM patterns, then chromatic component is used as using DM patterns Intra prediction mode；Or

When it is determined that TU codes instruction chromatic component intra prediction mode is LM patterns, then chromatic component is used as using LM patterns Intra prediction mode；Or when determining TU codes instruction chromatic component intra prediction mode neither DM patterns are nor LM patterns When, then using default mode as the chromatic component intra prediction mode, wherein the default mode is set in advance bright Spend one of component intra prediction mode；Or

When it is determined that TU codes instruction chromatic component intra prediction mode neither DM patterns then extract institute nor during LM patterns The second information in code stream is stated, the chromatic component intra prediction mode is determined according to second information.
5. according to the method described in claim any one of 1-3, it is characterised in that when by a fixed length FL codes carrying described second During information, the second information in the extraction code stream, determine that the chromatic component intra prediction mode includes：

The FL codes in code stream are extracted, pattern of surplus are determined by the FL codes, and use the pattern of surplus as chromatic component Intra prediction mode.
6. according to the method for claim 5, it is characterised in that the second information in the extraction code stream includes：

By the FL codes in equiprobability by-pass schema extraction code streams, wherein, the by-pass patterns include without using The binary system entropy code or entropy decoding pattern of probabilistic model.
7. according to the method for claim 5, it is characterised in that second information is taken by length by 2 fixed length FL codes Band.
8. according to the method for claim 7, it is characterised in that the length is that the code word of 2 fixed length FL codes includes：00, 01,10,11, the code word is used for the pattern of surplus for representing the chromatic component intra prediction mode.
9. according to the method described in claim any one of 1-3, it is characterised in that before extraction second information, institute Stating method also includes：

Determine whether the set of chromatic component intra prediction mode includes LM patterns；And

When it is determined that the set of chromatic component intra prediction mode does not include LM patterns, the first information is only included for indicating institute State chromatic component intra prediction mode whether be DM patterns information, or

When it is determined that the set of chromatic component intra prediction mode includes LM patterns, the first information includes being used to indicate the color Degree component intra prediction mode whether be DM patterns or LM patterns information.
10. according to the method for claim 9, it is characterised in that described to determine that chromatic component intra prediction mode set is No to include including LM patterns, the flag in code stream determines whether the set of chromatic component intra prediction mode includes LM patterns.
11. according to the method for claim 9, it is characterised in that described colourity to be can determine that according to the first information During component intra prediction mode, the second information in the code stream is extracted；The chromatic component is determined according to second information After intra prediction mode, methods described also includes：

When the chromatic component intra prediction mode determined according to the first information neither DM patterns are nor LM patterns When, further determine that the current block luminance component intra prediction mode whether with the institute that is determined according to second information It is identical to state chromatic component intra prediction mode；

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When identical, the chromatic component intra prediction mode of the determination is replaced using alternative patterns, wherein the alternative patterns are One of pattern all different from the pattern in chromatic component intra prediction mode set,

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When differing, the chromatic component intra prediction mode of the determination keeps constant.
12. according to the method for claim 9, it is characterised in that the pattern of surplus includes：DC patterns, vertical pattern, water It is flat-die type powdered, plane mode.
A kind of 13. device of decoding, it is characterised in that including：

First extraction unit, for extracting the first information in code stream；

First determining unit, the first information for being extracted according to first extraction unit determine pre- in chromatic component frame Survey pattern；

Second extraction unit, for not can determine that chromatic component infra-frame prediction mould according to the first information when first determining unit During formula, the second information in the code stream is extracted；With

Second determining unit, second information for being extracted according to second extraction unit determine the chromatic component frame Inner estimation mode, wherein

The first information includes being used to indicate whether the chromatic component intra prediction mode is DM patterns, wherein, the DM Pattern is predicted including the use of the intra prediction mode of the luminance component of current block as the predictive mode of chromatic component；

Second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode, and the pattern of surplus is It can be used for one of chromatic component intra prediction mode in addition to the pattern that the first information may determine；

Characterized in that, it is described when not can determine that chromatic component intra prediction mode according to the first information, described in extraction The second information in code stream；After determining the chromatic component intra prediction mode according to second information, described device is also For：

When the chromatic component intra prediction mode determined according to the first information is not DM patterns, institute is further determined that State the luminance component of current block intra prediction mode whether with the chromatic component frame that is determined according to second information Predictive mode is identical；

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When identical, the chromatic component intra prediction mode of the determination is replaced using alternative patterns, wherein the alternative patterns are One of pattern all different from the pattern in chromatic component intra prediction mode set,

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When differing, the chromatic component intra prediction mode of the determination keeps constant.
14. device according to claim 13, it is characterised in that：

When the first information of first extraction unit extraction includes the DM information of a binary character carrying, wherein institute When stating DM information and being used for whether indicate the chromatic component intra prediction mode to be DM patterns,

First determining unit is specifically used for when the determination DM information indicates that the chromatic component intra prediction mode is DM During pattern, then chromatic component intra prediction mode is used as using DM patterns；Or first determining unit is specifically used for when determination When the DM information instruction chromatic component intra prediction mode is non-DM patterns, then chromatic component is used as using default mode Intra prediction mode, wherein the default mode is one of luminance component intra prediction mode set in advance；Or

Second extraction unit is specifically used for when first determining unit determines that the DM information indicates the chromatic component When intra prediction mode is non-DM patterns, then the second information in the code stream is extracted, and

Second determining unit is specifically used for determining the color according to second information that second extraction unit extracts Spend component intra prediction mode.
15. device according to claim 14, it is characterised in that when first letter of first extraction unit extraction The DM information of breath indicates that the chromatic component intra prediction mode is non-DM patterns, and the first information also enters including one two The LM information that symbol processed carries, wherein the LM information is used to indicate whether the chromatic component intra prediction mode is LM patterns When, the determination chromatic component intra prediction mode includes：

First determining unit is specifically used for when the determination LM information indicates that the chromatic component intra prediction mode is LM During pattern, then chromatic component intra prediction mode is used as using LM patterns；Or

First determining unit is specifically used for when the determination LM information indicates that the chromatic component intra prediction mode is non- During LM patterns, then using default mode as chromatic component intra prediction mode, wherein the default mode is set in advance One of luminance component intra prediction mode；Or

First determining unit is specifically used for determining that the LM information indicates that the chromatic component intra prediction mode is non-LM During pattern, then the second information in the code stream is extracted, and

Second determining unit is specifically used for determining the color according to second information that second extraction unit extracts Spend component intra prediction mode.
16. according to the device described in claim any one of 13-15, it is characterised in that when first extraction unit extraction by For 2 when blocking the unitary TU codes carrying first information, described device includes one maximum：

First determining unit is specifically used for when it is determined that TU codes instruction chromatic component intra prediction mode is DM patterns, DM patterns are then used as chromatic component intra prediction mode；Or

First determining unit is specifically used for when it is determined that TU codes instruction chromatic component intra prediction mode is LM patterns, LM patterns are then used as chromatic component intra prediction mode；Or

First determining unit is specifically used for when determining TU codes instruction chromatic component intra prediction mode neither DM moulds Formula is nor during LM patterns, then using default mode as the chromatic component intra prediction mode, wherein the default mode It is one of luminance component intra prediction mode set in advance；Or

Second extraction unit is specifically used for when first determining unit is determined in the TU codes instruction chromatic component frame in advance Survey pattern neither DM patterns then extract the second information in the code stream nor during LM patterns, and

Second determining unit is specifically used for determining institute using second information extracted according to second extraction unit State chromatic component intra prediction mode.
17. according to the device described in claim any one of 13-15, it is characterised in that:

When carrying second information by a fixed length FL code,

The first extraction unit extraction is specifically used for the FL codes in extraction code stream, and the second determining unit is specifically used for passing through institute The FL codes for stating the extraction of the first extraction unit determine pattern of surplus, and use the pattern of surplus as pre- in chromatic component frame Survey pattern.
18. device according to claim 17, it is characterised in that：

First extraction unit is specifically used for described second carried by equiprobability by-pass schema extractions by the FL codes Information, wherein, the by-pass patterns include the binary system entropy code or entropy decoding pattern without using probabilistic model.
19. device according to claim 17, it is characterised in that：Second information is as entrained by the FL codes that length is 2.
20. device according to claim 19, it is characterised in that the length is that the code word of 2 fixed length FL codes includes： 00,01,10,11, the code word is used for the pattern of surplus for representing the chromatic component intra prediction mode.
21. according to the device described in claim any one of 13-15, it is characterised in that described device also includes：

3rd determining unit, for determining whether the set of chromatic component intra prediction mode includes LM patterns；And

When the 3rd determining unit determines that the set of chromatic component intra prediction mode does not include LM patterns, first extraction Unit extraction the first information only include for indicate the chromatic component intra prediction mode whether be DM patterns letter Breath, or

When the 3rd determining unit determines that the set of chromatic component intra prediction mode includes LM patterns, first extraction is single The first information of member extraction includes being used to indicate whether the chromatic component intra prediction mode is DM patterns or LM patterns Information.
22. device according to claim 21, it is characterised in that described to determine that chromatic component intra prediction mode set is No to include including LM patterns, the flag in code stream determines whether the set of chromatic component intra prediction mode includes LM patterns.
23. device according to claim 22, it is characterised in that described device also includes：

4th determining unit, for when the chromatic component intra prediction mode determined according to the first information is neither DM Pattern nor during LM patterns, further determine that the current block luminance component intra prediction mode whether with according to The chromatic component intra prediction mode that second information determines is identical；

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When identical, the chromatic component intra prediction mode of the determination is replaced using alternative patterns, wherein the alternative patterns are One of pattern all different from the pattern in chromatic component intra prediction mode set,

When the intra prediction mode and the chromatic component intra prediction mode of the determination of the luminance component of the current block When differing, the chromatic component intra prediction mode of the determination keeps constant.
24. device according to claim 21, it is characterised in that the pattern of surplus includes：DC patterns, vertical pattern, Horizontal pattern, plane mode.