CN104093025A - Coding and decoding method and device - Google Patents
Coding and decoding method and device Download PDFInfo
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Abstract
The embodiment of the invention provides a coding and decoding method and device. The method includes the following steps: extracting first information in a code stream; according to the first information, determining a chroma component in-frame prediction mode; when the chroma component in-frame prediction mode cannot be determined according to the first information, extracting second information in the code stream; and according to the second information, determining the chroma component in-frame prediction mode, wherein the first information includes information used for indicating whether the chroma component in-frame prediction mode is a DM mode or an LM mode and the second information is used for indicating a rest mode used as the chroma component in-frame prediction mode and the rest mode is one of modes, which can be used for the chroma component in-frame prediction mode, excluding modes which may be determined by the first information. The device includes a first extraction unit, a first determination unit, a second extraction unit and a second determination unit. The technical scheme is capable of reducing coding information of a chroma mode and optimizing ranking so that coding and decoding steps are reduced and thus coding and decoding complexity is reduced and decoding efficiency is improved.
Description
Technical field
The present invention relates to field of video image processing, and more specifically, relate to decoding method and device.
Background technology
Existing video image encoding and decoding technology comprises intraframe coding technology and inter-frame coding.Intraframe coding refers to only utilize the spatial coherence in current encoded image picture material to be carried out to the technology of compressed encoding.Interframe encode refers to utilize the temporal correlation of current encoded image and encoded image present image to be carried out to the technology of compressed encoding.For improving the intraframe coding efficiency of image, H.264/AVC (Advanced Video Coding, advanced Video coding) standard is introduced the spatial information redundancy that infra-prediction techniques removes current encoded image piece and contiguous encoded image piece first.Therefore, different from intraframe coding technology before, H.264/AVC only need prediction difference signal but not original image signal, carry out spatial alternation and entropy coding, thereby 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 encoding standard scheme of new generation that current International Standards Organization is being studied, it has inherited the intraframe predictive coding technology in standard H.264/AVC, and has introduced new intra prediction mode LM pattern for chromatic component.When using LM pattern, the chromatic component predicted value of image block, the reconstructed value that the luminance component by corresponding blocks is resampled calculates by linear model.Therefore, LM pattern is different from traditional directivity intra prediction mode, and it utilizes the correlation of picture carrier component and chromatic component, uses the method for luminance component value prediction chromatic component value.
HEVC scheme has been inherited the intraframe predictive coding technology in standard H.264/AVC and has been expanded.All optional intra prediction mode predicted composition set of modes of image block chromatic component wherein, comprise following 6 kinds of predictive modes:
DM pattern: the intra prediction mode of the luminance component of use current block, as the predictive mode of chromatic component, is predicted;
LM pattern: calculate the predicted value of chromatic component by the value of sampled point point luminance component based on linear model, the luma component values of the sampled point that PARAMETERS IN THE LINEAR MODEL is close to by current block and chromatic component value calculate;
DC pattern: the mean value of the value of the chromatic component of the sampled point that use current block is contiguous is as the predicted value of current block chromatic component;
Plane (English is Planar) pattern: the hypothesis of the linear smooth change in space of the value based on sampled point is calculated the predicted value of current block sampled point;
Horizontal pattern: the value of the contiguous sampled point chromatic component in the positive left side of use is the predicted value with all sampled point chromatic components in a line as current block;
Vertical pattern: directly over use, the value of contiguous sampled point chromatic component is as the predicted value of all sampled point chromatic components in the same row of current block.
In correlation technique, to the above-mentioned predictive mode of colourity, use TU (Truncated Unary, blocks monobasic) code plan to carry out encoding and decoding, the complexity of encoding and decoding is high, and decoding efficiency is low.
Summary of the invention
The embodiment of the present invention provides a kind of decoding method and device, and in the time of can reducing video image processing, the complexity of encoding and decoding, improves decoding efficiency.
On the one hand, provide a kind of decoding method, having comprised: extracted the first information in code stream; According to the first information, determine chromatic component intra prediction mode; When can not determine chromatic component intra prediction mode according to the first information, extract the second information in code stream; According to the second information, determine chromatic component intra prediction mode, wherein the first information comprises whether be used to indicate chromatic component intra prediction mode is the information of DM pattern or LM pattern, the second information is used to indicate the pattern of surplus as chromatic component intra prediction mode, and pattern of surplus is for can be used for one of them of chromatic component intra prediction mode pattern that may be definite except the first information.
On the other hand, provide a kind of device of encoding and decoding, comprised the first extraction unit, the first determining unit, the second extraction unit and the second determining unit, the first extraction unit wherein, for extracting the first information of code stream; The first determining unit, determines chromatic component intra prediction mode for the first information extracting according to the first extraction unit; The second extraction unit, for when the first determining unit be can not determine chromatic component intra prediction mode according to the first information, extracts the second information in code stream; With the second determining unit, for the second information of extracting according to the second extraction unit, determine chromatic component intra prediction mode, wherein the first information comprises whether be used to indicate chromatic component intra prediction mode is the information of DM pattern or LM pattern, the second information is used to indicate the pattern of surplus as chromatic component intra prediction mode, and pattern of surplus is for can be used for one of them of chromatic component intra prediction mode pattern that may be definite except the first information.
Technique scheme can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in the embodiment of the present invention be briefly described below, apparently, below described accompanying drawing be only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other 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 clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, should belong to the scope of protection of the invention.
Term "and/or", is only a kind of incidence relation of describing affiliated partner herein, and expression can exist three kinds of relations, and for example, A and/or B, can represent: individualism A exists A and B, these three kinds of situations of individualism B simultaneously.In addition, character "/", generally represents that forward-backward correlation is to liking a kind of relation of "or" herein.
Chromatic component in the embodiment of the present invention can refer to the chromatic component arbitrarily in two chromatic components.Wherein the DC pattern in the chromatic component intra prediction mode of HEVC, vertically pattern, horizontal pattern and plane mode are identical with the associative mode basic principle in standard H.264/AVC, specific implementation method is different.LM pattern and DM pattern are new two kinds of patterns of adding.Except above-mentioned predictive mode, also has an alternative patterns.When if DM pattern is identical with all the other predictive modes in predictive mode set, uses alternative patterns to replace the prediction mode for chroma identical with DM pattern, thereby form new predictive mode set.Wherein the intra prediction mode of the luminance component of DM pattern using current block is predicted as the predictive mode of chromatic component.Therefore, in said method, also can determine that whether the intra prediction mode of luminance component is identical with all the other predictive modes in predictive mode set of equal valuely.Alternative patterns can be and the equal not identical predictive mode of all patterns in the set of chromatic component predictive mode.
In the different embodiment of this patent, the set of chromatic component predictive mode may be different.A kind of available chromatic component predictive mode set comprises DM pattern, LM pattern, DC pattern, vertical pattern, horizontal pattern and plane mode.Another kind of available chromatic component predictive mode set comprises DM pattern, DC pattern, vertical pattern, horizontal pattern and plane mode.Another kind of available chromatic component predictive mode set comprises DM pattern, LM pattern and default mode.Another kind of available chromatic component predictive mode set comprises DM pattern and default mode.
LM pattern in above-mentioned pattern is can selecting technology in current HEVC scheme.Under HE (High Efficiency, efficient) coding configuration condition, in chrominance frames inner estimation mode alternative mode, comprise LM pattern, now 6 kinds of predictive modes of predictive mode set-inclusion; But under LC (Low Complexity, low complex degree) coding configuration condition, in chrominance frames inner estimation mode alternative mode, do not comprise LM pattern, now 5 kinds of predictive modes of predictive mode set-inclusion.In current HEVC scheme, whether LM is that alternative mode determines according to the binary character (flag) in code stream.
This chroma coder scheme is used TU (Truncated Unary) code to carry out binaryzation to the pattern information of current block, to the binary character after binaryzation, use CABAC (Context Cased Binary Arithmetic Coding, based on context binary arithmetic coding) technology to carry out entropy coding again.For example, under HE configuration condition, DM, LM, vertically, and level, 6 kinds of patterns of DC and plane can be used respectively TU code word 0,10,110,1110, and 11110,11111 represent; Under LC configuration condition, DM, vertically, and level, 5 kinds of patterns of DC and plane can be used respectively TU code word 0,10,110,1110, and 1111 represent.The TU code word that decoding end obtains according to parsing is determined the predictive mode of current block chromatic component.
In fact, TU code word can be regarded the series connection of one group of binary character as, according to the value of each binary character, judges whether to continue successively the binary character of coding or decode successive in entropy coding or entropy decode procedure.In addition, in TU code word, each binary character represents the judgement of a binaryzation.For example, under LC coding configuration condition, adopt the TU code that maximum is 5, in this TU code, comprise at most 4 binary characters.Wherein, the 1st binary character is for determining whether the pattern of current block is DM pattern, the 2nd binary character is for determining whether the pattern of current block is vertical pattern, the 3rd binary character is for determining whether the pattern of current block is horizontal pattern, and the 4th binary character is for determining whether the pattern of current block is DC pattern.If not above-mentioned four kinds of patterns, must be plane mode so.
While using TU code word to carry out encoding and decoding to colourity component frame inner estimation mode information, need to determine whether coding or the next binary character of decoding according to the value of previous binary character.This opportunistic coding or decoding have increased the complexity of entropy coding or entropy decoding.
DM pattern selects ratio very high, and this has reduced the importance of outer other pattern of DM.And DM pattern is with plane mode, DC pattern, horizontal pattern and vertically pattern is all likely identical, in this explanation alternative mode set, have larger redundancy, and this redundancy can affect video image compression efficiency;
Alternative mode quantity is more, has 6 kinds of alternative modes under HE condition, has 5 kinds of alternative modes under LC condition.This can increase the computation complexity of coding side model selection process.
The embodiment of the present invention provides a kind of decoding method, can address the above problem.
Fig. 1 is the schematic flow diagram of the decoding method 10 of one embodiment of the invention, comprises following content.
11, extract the first information in code stream.
The first information comprises whether be used to indicate chromatic component intra prediction mode is the information of DM pattern or LM pattern.
12, according to the first information, determine chromatic component intra prediction mode.
13, when can not determine chromatic component intra prediction mode according to the first information, extract the second information in described code stream.
14, according to described the second information, determine described chromatic component intra prediction mode.
The second information is used to indicate the pattern of surplus as described chromatic component intra prediction mode, and described pattern of surplus is for can be used for one of them of chromatic component intra prediction mode pattern that may be definite except the described first information.
Pattern of surplus can be one of pattern pattern that may be definite except the described first information in the set of chromatic component intra prediction mode.For example, if whether the described first information is DM pattern or LM pattern for definite chromatic component intra prediction mode, described pattern of surplus can be one of pattern except DM pattern and LM pattern in the set of chromatic component intra prediction mode.
For when luminance component intra prediction mode is identical with used chromatic component intra prediction mode, can also use alternative patterns to replace described chromatic component intra prediction mode, described alternative patterns is one of pattern different from pattern in the set of chromatic component intra prediction mode.。
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Fig. 2 is the schematic flow diagram of the decoding method 20 of another embodiment of the present invention, comprises following content.
21, extract the first information in code stream.
The first information comprises whether be used to indicate chromatic component intra prediction mode is the information of DM pattern or LM pattern.The first information can comprise one or two sub-information of being carried by binary character.Also can be 2 TU code to the maximum by one and carry the first information.
22, by the first information, determine whether chromatic component intra prediction mode is DM pattern.
When being defined as DM pattern, during "Yes", execution step 23, is used DM pattern as chromatic component intra prediction mode.
When being defined as non-DM pattern, during "No", optional, execution step 24, confirms whether comprise LM pattern, the same prior art of confirmation method in the set of chromatic component intra prediction mode.
When determining that set comprises LM pattern, during "Yes", execution step 25.
25, by the first information, determine whether chromatic component intra prediction mode is LM pattern.
When being defined as LM pattern, during "Yes", execution step 26, is used LM pattern as chromatic component intra prediction mode.
When being defined as non-LM pattern, during "No", execution step 27.
After execution step 24, determine that set does not comprise LM pattern, during "No", perform step equally 27.
27, extract the second information in code stream.
28, by the second information, determine pattern of surplus, use described pattern of surplus as chromatic component intra prediction mode.
Pattern of surplus can be one of pattern pattern that may be definite except the described first information in the set of chromatic component intra prediction mode.For example, the described first information is for determining whether chromatic component intra prediction mode is DM pattern or LM pattern in the present embodiment, and described pattern of surplus can be any of 4 kinds of patterns except DM pattern and LM pattern in the set of chromatic component intra prediction mode.The second information can be carried the coded message which this pattern of surplus is specially.The coded message of 4 kinds of patterns can be used FL code to carry, and wherein each pattern and a FL code are set up and had corresponding relation.
Step 29, whether the chromatic component intra prediction mode definite when abovementioned steps be identical with luminance component intra prediction mode.
If identical, "Yes", performs step 30, determines and uses alternative patterns as chromatic component intra prediction mode.Wherein alternative patterns is one of pattern different from pattern in the set of chromatic component intra prediction mode.
If not identical, "No", performs step 31, determines that chromatic component intra prediction mode remains unchanged.
As a kind of implementation method, step 32 can step of replacing 27 and 28.
As another kind of implementation method, step 29 is optional, after step 32 or step 28, can directly perform step 31.
32, use default mode as chromatic component intra prediction mode, wherein said default mode is one of predefined luminance component intra prediction mode.
In technique scheme, for the different technologies adopting, such as the carrying mode of information etc.; a plurality of steps can merge above; or a step is divided into multistep and completes, and the present invention does not all limit this, within described implementation method all should be encompassed in protection scope of the present invention.
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Chromatic component intra prediction mode and luminance component intra prediction mode are all for current block, therefore in following examples respectively referred to as current block chroma mode and current block luminance patterns, conventionally also respectively referred to as chroma mode and luminance patterns.Pattern in standard in the set of luminance component intra prediction mode is conventionally more than the pattern in chromatic component intra prediction mode.Fig. 3 is the schematic flow diagram of one embodiment of the invention 300.
In embodiments of the present invention, with binary character, carry the first information.The first information can comprise that a binary character of use represents that whether current block chroma mode is the information of DM pattern, is denoted as DM information.
The first information can also comprise that a binary character of use represents that whether current block chroma mode is the information of LM pattern, is denoted as LM information.If LM pattern is not the alternative mode in chromatic component intra prediction mode, in code stream, can there is not LM information, coding side and decoding end can not carried out encoding and decoding operation to LM information yet.
The second information is used to indicate the pattern of surplus as described chromatic component intra prediction mode, and described pattern of surplus is for can be used for one of them of chromatic component intra prediction mode pattern that may be definite except the described first information.Can use length is that 2 FL (Fix Length, fixed length) code word represents the second information.Described pattern of surplus can be vertically, level, DC and 4 patterns of plane.For example can represent respectively this 4 patterns by FL code word 00,01,10,11.
When described DM information is carried out to entropy decoding, can not use context model, also can use a context model, can also from a plurality of context models, select according to the coded message of contiguous block a context model.
When described LM information is carried out to entropy decoding, can not use context model, also can use a context model, can also from a plurality of context models, select according to the coded message of contiguous block a context model.
When being carried out to entropy decoding, described the second information do not use context model.In other words, use by-pass (equiprobability) pattern FL code word that length is 2 of entropy decoding from code stream, and according to this FL code word, determine the pattern of correspondence as above.Can improve thus the throughput of entropy decoding.Described by-pass pattern i.e. not the binary system entropy of probability of use model coding or entropy decoding schema.In other words, by-pass pattern is supposed that current entropy coding or entropy decoding binary character are 0 or is that 1 probability equates.
It should be noted that not using context model to decode to a binary character is prior art, i.e. by-pass pattern in CABAC technology.Using a context model to decode to a binary character is prior art, and for example first binary character in the luminance frame internal schema coding and decoding scheme of HEVC adopts this entropy decoding method exactly.According to the coded message of contiguous block, selecting a context model from a plurality of context models is prior art, and for example the skip mode mark in HEVC scheme (English is skip flag) is exactly to adopt this entropy decoding method.Therefore the details of above-mentioned three kinds of entropy decoding methods is repeated no more.
Embodiment 300 comprises following content.
310, use the entropy decoding method of foregoing description from code stream, to extract DM information.If determine that according to DM information current block chroma mode is DM pattern, finishes this mode decision flow process; Otherwise execution step 320.
320, use the entropy decoding method of foregoing description from code stream, to extract LM information.If determine that according to LM information current block chroma mode is LM pattern, finishes this mode decision flow process; Otherwise execution step 330.
If it should be noted that in colourity infra-frame prediction alternative mode and do not comprise LM pattern, can not have LM information in code stream.Decoding end is also without carrying out this parse operation, and can skip this step.Can confirm whether comprise LM pattern in colourity infra-frame prediction alternative mode by prior art.
330, use the entropy decoding method of foregoing description from code stream, to extract the second information.Described the second information is that described length is 2 FL code word.
340, according to the second information, determine pattern of surplus information, and use described pattern of surplus as current block chroma mode.
According to the corresponding relation of FL code word and pattern of surplus, determine current block chroma mode.A kind of available corresponding relation as mentioned above.
Optionally, if current block luminance patterns with according to the method described above from pattern of surplus definite current block chroma mode identical, the current block chroma mode that uses alternative patterns step of replacing 340 to use.Can select a pattern different from pattern in the set of chromatic component intra prediction mode as described alternative patterns.For example, the optional directivity predictive mode along upper right lower left is as described alternative patterns.Current block luminance patterns with according to the method described above from pattern of surplus definite current block chroma mode not identical, the current block chroma mode that step 340 is used remains unchanged.
After definite current block chroma mode, can finish this mode decision flow process.
In addition,, for removing the redundancy in the optional predictive mode of chromatic component, optional, the optional predictive mode set of chromatic component that the present embodiment is used only comprises three kinds of chromatic component predictive modes, i.e. DM pattern, LM pattern and default mode.In this case, can also use step 360 step of replacing 330 and 340, other steps remain unchanged.Now by abovementioned steps, learn that current block chroma mode is not that DM pattern neither LM pattern.Default mode can be one of predefined luminance component intra prediction mode.
360, use default mode as current block chroma mode.
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Fig. 4 is the schematic flow diagram of another embodiment of the present invention 40.Different from embodiment 300, use the TU code word that a maximum is 2 to carry the first information, for representing whether current block chroma mode is DM pattern or LM pattern.This TU code word can be 0,10,11.These three code words can represent respectively that current block chroma mode is DM pattern, and current block chroma mode is LM pattern, and current block chroma mode is neither DM pattern neither LM pattern, and current block is a kind of in pattern of surplus set.If it should be noted that in colourity infra-frame prediction alternative mode and do not comprise LM pattern, this TU code word deteriorates to a binary character, and this binary character represents whether current block chroma mode is DM pattern.
FL (Fix Length, the fixed length) code word that same use length is 2 is carried the second information, to represent the pattern of surplus in prediction mode for chroma.Other methods that for example entropy is decoded are identical with embodiment 300.
41, by extracting described expression current block chroma mode, whether be the TU code word of DM pattern or LM pattern, confirm current block chroma mode.
Use the described entropy decoding method of embodiment 300 from code stream, to extract the TU code word that a maximum is 2.If determine that according to this TU code word current block chroma mode is DM pattern, finishes this mode decision flow process; If determine that according to this TU code word current block chroma mode is LM pattern, finishes this mode decision flow process; Otherwise, according to this TU code word, determine current block chroma mode neither DM pattern, neither LM pattern, execution step 42.
If it should be noted that in colourity infra-frame prediction alternative mode and do not comprise LM pattern, from code stream, do not resolve described maximum and be 2 TU code word, but from code stream, extract a binary character according to the method in embodiment 300.If determine that according to this binary character current block chroma mode is DM pattern, finishes this mode decision flow process; Otherwise execution step 42.
42, extract the second information.
Similar to step 330, use the entropy decoding method of describing in embodiment 300 from code stream, to extract the second information.Described the second information is that described length is 2 FL code word.
43, according to the second information, determine pattern of surplus, and use described pattern of surplus as current block chroma mode.
340 similar to embodiment 300, determines current block chroma mode according to the corresponding relation of FL code word and pattern of surplus.A kind of available corresponding relation as mentioned above.
Optionally, step 44, if current block luminance patterns with according to the method described above from pattern of surplus definite current block chroma mode identical, the current block chroma mode that uses alternative patterns step of replacing 43 to use.Can select a pattern different from pattern in the set of all chromatic component intra prediction modes as described alternative patterns.For example, the optional directivity predictive mode along upper right lower left is as described alternative patterns.Current block luminance patterns with according to the method described above from pattern of surplus definite current block chroma mode not identical, the current block chroma mode that step 43 is used remains unchanged.
After definite current block chroma mode, can finish this mode decision flow process.
In addition, similar with embodiment 300, for removing the redundancy in the optional predictive mode of chromatic component, optional, the optional predictive mode set of chromatic component that the present embodiment is used also can only comprise three kinds of chromatic component predictive modes, i.e. DM pattern, LM pattern and default mode.Correspondingly, as shown in Figure 4, can also use step 45 step of replacing 42 and 43, other steps remain unchanged, and now by abovementioned steps, learn that current block chroma mode is not that DM pattern neither LM pattern.
45, use default mode as current block chroma mode.
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Fig. 5 is according to the schematic block diagram of the device 50 of the encoding and decoding of the embodiment of the present invention.Device 50 the first extraction units 51 that comprise and the first confirmation unit 52, the second extraction unit 53 and the second confirmation unit 54.
The first information that the first extraction unit 51 extracts in code stream.
The first information that the first determining unit 52 is extracted according to the first extraction unit 51 is determined chromatic component intra prediction mode.
The second extraction unit 53, when described the first determining unit 51 is according to the first information, while can not determine chromatic component intra prediction mode, extracts the second information in described code stream.
Described the second information that the second determining unit 54 is extracted according to described the second extraction unit 53 is determined described chromatic component intra prediction mode.
Device 50 has been realized method 20 and 300, and detail repeats no more herein.
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
In addition, optionally, the described first information extracting when the first extraction unit 51 comprises the DM information that a binary character carries, whether wherein said DM information is used to indicate described chromatic component intra prediction mode is DM pattern, described the first determining unit 52, specifically for when definite described DM information indicates described chromatic component intra prediction mode to be DM pattern, is used DM pattern as chromatic component intra prediction mode.
Optionally, the described first information extracting when the first extraction unit 51 comprises the DM information that a binary character carries, whether wherein said DM information is used to indicate described chromatic component intra prediction mode is DM pattern, described the first determining unit 52 is specifically for when definite described DM information indicates described chromatic component intra prediction mode to be non-DM pattern, use default mode as chromatic component intra prediction mode, wherein said default mode is one of predefined luminance component intra prediction mode.
Optionally, the described first information extracting when described the first extraction unit 51 comprises the DM information that a binary character carries, when wherein said DM information is used to indicate described chromatic component intra prediction mode and whether is DM pattern, described the second extraction unit 53 is specifically for when described the first determining unit 52 determines that described DM information indicates described chromatic component intra prediction mode to be non-DM pattern, extract the second information in described code stream, and described the second determining unit 54 is determined described chromatic component intra prediction mode specifically for described the second information of extracting according to described the second extraction unit 51.
Optionally, it is non-DM pattern that the DM information of the first information extracting when described the first extraction unit 51 is indicated described chromatic component intra prediction mode, and the described first information also comprises the LM information that a binary character carries, whether wherein said LM information is used to indicate described chromatic component intra prediction mode is LM pattern, described the first determining unit 52, specifically for when definite described LM information indicates described chromatic component intra prediction mode to be LM pattern, is used LM pattern as chromatic component intra prediction mode.
Optionally, it is non-DM pattern that the DM information of the described first information extracting when described the first extraction unit 51 is indicated described chromatic component intra prediction mode, and the described first information also comprises the LM information that a binary character carries, whether wherein said LM information is used to indicate described chromatic component intra prediction mode is LM pattern, described the first determining unit 52 is specifically for when definite described LM information indicates described chromatic component intra prediction mode to be non-LM pattern, use default mode as chromatic component intra prediction mode, wherein said default mode is one of predefined luminance component intra prediction mode.
Optionally, it is non-DM pattern that the DM information of the described first information extracting when described the first extraction unit 51 is indicated described chromatic component intra prediction mode, and the described first information also comprises the LM information that a binary character carries, whether wherein said LM information is used to indicate described chromatic component intra prediction mode is LM pattern, described the second extraction unit 53 is specifically for when described the first determining unit 52 determines that described LM information indicates described chromatic component intra prediction mode to be non-LM pattern, extract the second information in described code stream, and described the second determining unit 54 is determined described chromatic component intra prediction mode specifically for described the second information of extracting according to described the second extraction unit 53.
Optionally, when described the first extraction unit 51 extracts the described first information that monobasic (TU) code carries that blocks that is 2 by a maximum, described the first determining unit 52, specifically for when determining that described TU code indication chromatic component intra prediction mode is DM pattern, is used DM pattern as chromatic component intra prediction mode.
Optionally, when described the first extraction unit concrete 5 extracts the described first information that the TU code that is 2 by a maximum carries, described the first determining unit 52, specifically for when determining that described TU code indication chromatic component intra prediction mode is LM pattern, is used LM pattern as chromatic component intra prediction mode.
Optionally, when described the first extraction unit 51 extracts the described first information that the TU code that is 2 by a maximum carries, described the first determining unit 52 specifically for when determining described TU code indication chromatic component intra prediction mode neither DM pattern neither LM pattern time, use default mode as described chromatic component intra prediction mode, wherein said default mode is one of predefined luminance component intra prediction mode.
Optionally, when described the first extraction unit 51 extracts the described first information that the TU code that is 2 by a maximum carries, described the second extraction unit 53 specifically for determining described TU code indication chromatic component intra prediction mode when described the first determining unit 52 neither DM pattern neither LM pattern time, extract the second information in described code stream, and described the second determining unit 54 is specifically for being used described the second information of extracting according to described the second extraction unit 53 to determine described chromatic component intra prediction mode.
Optionally, when described the first extraction unit 51 extracts described second information of being carried by a fixed length (FL) code, described the second determining unit 53 is specifically for determining pattern of surplus by described FL code, and uses described pattern of surplus as chromatic component intra prediction mode.Wherein, described the first extraction unit 51 can extract described second information of being carried by a FL code by equiprobability (by-pass) pattern.
Fig. 6 is according to the schematic block diagram of another device 60 of the encoding and decoding of the embodiment of the present invention.As a kind of implementation device 60, comprise the first extraction unit 61, the first confirmation unit 62, the second extraction unit 63, the second confirmation unit 64, same or similar with the first extraction unit 51, the first confirmation unit 52, the second extraction unit 53, second confirmation unit 54 of device 50, different is to comprise the 3rd confirmation unit 65 and/or the 4th confirmation unit 66.
The first information that the first extraction unit 61 extracts in code stream.
The first information that the first determining unit 62 is extracted according to the first extraction unit 61 is determined chromatic component intra prediction mode.
The second extraction unit 63, when described the first determining unit 61 is according to the first information, while can not determine chromatic component intra prediction mode, extracts the second information in described code stream, and
Described the second information that the second determining unit 64 is extracted according to described the second extraction unit 63 is determined described chromatic component intra prediction mode.
The 3rd determining unit 65 determines whether the set of chromatic component intra prediction mode comprises LM pattern.
When described the 3rd determining unit 65 determines that the set of chromatic component intra prediction mode does not comprise LM pattern, whether the described first information that described the first extraction unit 61 extracts only includes and is used to indicate described chromatic component intra prediction mode is the information of DM pattern.Or, when described the 3rd determining unit 65 determines that the set of chromatic component intra prediction mode comprises LM pattern, the described first information that described the first extraction unit 61 extracts comprises whether be used to indicate described chromatic component intra prediction mode is the information of DM pattern or LM pattern.
The 4th determining unit 66 when determined described chromatic component intra prediction mode neither DM pattern neither LM pattern time, determines that whether luminance component intra prediction mode identical with determined described chromatic component intra prediction mode.
When described the 4th determining unit 66 determines that luminance component intra prediction mode is identical with determined described chromatic component intra prediction mode, use alternative patterns to replace determined described chromatic component intra prediction mode, wherein said alternative patterns is one of pattern different from pattern in the set of chromatic component intra prediction mode.Or when described the 4th determining unit 66 determines that luminance component intra prediction mode is not identical with determined described chromatic component intra prediction mode, determined described chromatic component intra prediction mode remains unchanged.
Device 60 has been realized method 20 and 300, and detail repeats no more herein.
The embodiment of the present invention can be reduced the coded message of chroma mode and Optimal scheduling, thereby reduces encoding and decoding step, reduces thus the complexity of encoding and decoding, improves the efficiency of decoding.
Those of ordinary skills can recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with the combination of electronic hardware or computer software and electronic hardware.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the system of foregoing description, device and unit, can, with reference to the corresponding process in preceding method embodiment, not repeat them here.
In the several embodiment that provide in the application, should be understood that disclosed system, apparatus and method can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual realization, can have other dividing mode, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit exists, and also can be integrated in a unit two or more unit.
If described function usings that the form of SFU software functional unit realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words or the part of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), the various media that can be program code stored such as random access memory (RAM, Random Access Memory), magnetic disc or CD.
The scheme that the embodiment of the present invention provides can be applied in digital processing field, and by video encoder, decoder is realized.Video encoder, decoder is for example widely used in, in various communication apparatus or electronic equipment: media gateway, mobile phone, wireless device, personal digital assistant (PDA, Personal Data Assistant), hand-hold type or portable computer, GPS (Global Positioning System, global positioning system) receiver/omniselector, camera, video player, video camera, video tape recorder, watch-dog etc.This kind equipment comprises processor, memory, and the interface of transmission data.Video Codec can be directly by digital circuit or chip for example DSP (Digital Signal Processor, digital signal processor) realize, or drive the flow process in a processor software code and realize by software code.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (28)
1. a coding/decoding method for video image, is characterized in that, comprising:
Extract the first information in code stream;
According to the described first information, determine the chromatic component intra prediction mode of current block;
When can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream;
According to described the second information, determine the chromatic component intra prediction mode of described current block,
Wherein
Whether the chromatic component intra prediction mode that the described first information is used to indicate described current block is DM pattern, and the intra prediction mode of the luminance component of described DM pattern using current block is predicted as the predictive mode of chromatic component;
Described the second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode of described current block, one of them that described pattern of surplus is the chromatic component intra prediction mode that can be used for current block pattern that may be definite except the described first information.
2. method according to claim 1, is characterized in that, the described first information comprises the DM information that a binary character carries, and whether the chromatic component intra prediction mode that wherein said DM information is used to indicate described current block is DM pattern.
3. method according to claim 1 and 2, is characterized in that, described the second information is entrained by fixed length FL code.
4. method according to claim 3, is characterized in that, the fixed length FL code that described the second information is 2 by length is entrained.
5. method according to claim 4, is characterized in that, the code word of the fixed length FL code that described length is 2 comprises: 00,01,10,11, and described code word is for representing the pattern of surplus of the chromatic component intra prediction mode of described current block.
6. according to the method described in claim 3-5 any one, it is characterized in that, when can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream; The chromatic component intra prediction mode of determining described current block according to described the second information, comprising:
Extract the fixed length FL code in code stream, by described fixed length FL code, determine pattern of surplus, and use described pattern of surplus as the chromatic component intra prediction mode of described current block.
7. according to the method described in claim 3-6 any one, it is characterized in that, the second information in the described code stream of described extraction, comprising:
By equiprobability by-pass pattern, extract the fixed length FL code in code stream.
8. according to the method described in claim 1-7 any one, it is characterized in that the first information in described extraction code stream; According to the described first information, determine the chromatic component intra prediction mode of described current block; Comprise: extract the first information in code stream, to the described first information, use a context model to carry out entropy decoding; The described first information obtaining according to decoding, determines the chromatic component intra prediction mode of described current block.
9. according to the method described in claim 1-8 any one, it is characterized in that, described according to the described first information, determine the chromatic component intra prediction mode of described current block; When can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream; The chromatic component intra prediction mode of determining described current block according to described the second information, comprising:
When determining that according to the described first information the described first information indicates the chromatic component intra prediction mode of described current block to be DM pattern, use DM pattern as the chromatic component intra prediction mode of described current block;
When determining that according to the described first information the described first information indicates the chromatic component intra prediction mode of described current block to be non-DM pattern, extract the second information in described code stream, according to described the second information, determine the chromatic component intra prediction mode of described current block.
10. according to the method described in claim 1-9 any one, it is characterized in that, described when can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream; Determine the chromatic component intra prediction mode of described current block according to described the second information after, described method also comprises:
When the chromatic component intra prediction mode of the described current block of determining according to the described first information is not DM pattern, further whether the intra prediction mode of the luminance component of definite described current block is identical with the chromatic component intra prediction mode of the described current block of determining according to described the second information;
When the intra prediction mode of luminance component of described current block is identical with the chromatic component intra prediction mode of described definite described current block, use alternative patterns to replace the chromatic component intra prediction mode of described definite described current block, wherein said alternative patterns is all one of different patterns of pattern in the chromatic component intra prediction mode set from current block
When the intra prediction mode of luminance component of described current block is not identical with the chromatic component intra prediction mode of described definite described current block, the chromatic component intra prediction mode of described definite described current block remains unchanged.
11. according to the method described in claim 1-10 any one, it is characterized in that, before described the second information of described extraction, described method also comprises:
Whether the chromatic component intra prediction mode set of determining described current block comprises LM pattern; And
When determining that the chromatic component intra prediction mode set of described current block does not comprise LM pattern, the described first information only includes whether the chromatic component intra prediction mode that is used to indicate described current block is the information of DM pattern;
When determining that the chromatic component intra prediction mode set of described current block comprises LM pattern, the described first information also comprises whether the chromatic component intra prediction mode that is used to indicate described current block is the information of LM pattern.
12. methods according to claim 11, is characterized in that, described when can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream; Determine the chromatic component intra prediction mode of described current block according to described the second information after, described method also comprises:
When the chromatic component intra prediction mode of the described current block of determining according to the described first information neither DM pattern neither LM pattern time, further determines that whether the intra prediction mode of luminance component of described current block identical with the chromatic component intra prediction mode of the described current block of determining according to described the second information;
When the intra prediction mode of luminance component of described current block is identical with the chromatic component intra prediction mode of described definite described current block, use alternative patterns to replace the chromatic component intra prediction mode of described definite described current block, wherein said alternative patterns is all one of different patterns of pattern in the chromatic component intra prediction mode set from current block
When the intra prediction mode of luminance component of described current block is not identical with the chromatic component intra prediction mode of described definite described current block, the chromatic component intra prediction mode of described definite described current block remains unchanged.
13. according to the method described in claim 10 or 12, it is characterized in that, described alternative patterns comprises: along the directivity predictive mode of upper right lower left.
14. according to the method described in claim 1-13 any one, it is characterized in that, described pattern of surplus comprises: DC pattern, vertical pattern, horizontal pattern, plane mode.
The decoding device of 15. 1 kinds of video images, is characterized in that, described decoding device comprises processor, and described processor is arranged to:
Extract the first information in code stream;
According to the described first information, determine the chromatic component intra prediction mode of current block;
When can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream;
According to described the second information, determine the chromatic component intra prediction mode of described current block,
Wherein
Whether the chromatic component intra prediction mode that the described first information is used to indicate described current block is DM pattern, and the intra prediction mode of the luminance component of described DM pattern using current block is predicted as the predictive mode of chromatic component;
Described the second information is used to indicate the pattern of surplus as the chromatic component intra prediction mode of described current block, one of them that described pattern of surplus is the chromatic component intra prediction mode that can be used for current block pattern that may be definite except the described first information.
16. decoding devices according to claim 15, is characterized in that, the described first information comprises the DM information that a binary character carries, and whether the chromatic component intra prediction mode that wherein said DM information is used to indicate described current block is DM pattern.
17. according to the decoding device described in claim 15 or 16, it is characterized in that, described the second information is entrained by fixed length FL code.
18. decoding devices according to claim 17, is characterized in that, the fixed length FL code that described the second information is 2 by length is entrained.
19. decoding devices according to claim 18, is characterized in that, the code word of the fixed length FL code that described length is 2 comprises: 00,01,10,11, and described code word is for representing the pattern of surplus of the chromatic component intra prediction mode of described current block.
20. according to the decoding device described in claim 17-19 any one, it is characterized in that, when can not determine the chromatic component intra prediction mode of described current block according to the described first information, extracts the second information in described code stream; The chromatic component intra prediction mode of determining described current block according to described the second information, comprising:
Extract the fixed length FL code in code stream, by described fixed length FL code, determine pattern of surplus, and use described pattern of surplus as the chromatic component intra prediction mode of described current block.
21. according to the decoding device described in claim 17-20 any one, it is characterized in that, the second information in the described code stream of described extraction, comprising:
By equiprobability by-pass pattern, extract the fixed length FL code in code stream.
22. according to the decoding device described in claim 15-21 any one, it is characterized in that, described decoding device is used for by concrete configuration: extract the first information of code stream, to the described first information, use a context model to carry out entropy decoding; The described first information obtaining according to decoding, determines the chromatic component intra prediction mode of current block.
23. according to the decoding device described in claim 15-22 any one, it is characterized in that, described decoding device is used for by concrete configuration:
When determining that according to the described first information the described first information indicates the chromatic component intra prediction mode of described current block to be DM pattern, use DM pattern as the chromatic component intra prediction mode of current block;
When determining that according to the described first information the described first information indicates the chromatic component intra prediction mode of described current block to be non-DM pattern, extract the second information in described code stream, according to described the second information, determine the chromatic component intra prediction mode of described current block.
24. according to the decoding device described in claim 15-23 any one, it is characterized in that, described decoding device is also arranged to:
Described when can not determine the chromatic component intra prediction mode of current block according to the described first information, extract the second information in described code stream; Determine the chromatic component intra prediction mode of described current block according to described the second information after;
When the chromatic component intra prediction mode of the described current block of determining according to the described first information is not DM pattern, further whether the intra prediction mode of the luminance component of definite described current block is identical with the chromatic component intra prediction mode of the described current block of determining according to described the second information;
When the intra prediction mode of luminance component of described current block is identical with the chromatic component intra prediction mode of described definite described current block, use alternative patterns to replace the chromatic component intra prediction mode of described definite described current block, wherein said alternative patterns is all one of different patterns of pattern in the chromatic component intra prediction mode set from current block
When the intra prediction mode of luminance component of described current block is not identical with the chromatic component intra prediction mode of described definite described current block, the chromatic component intra prediction mode of described definite described current block remains unchanged.
25. according to the decoding device described in claim 15-24 any one, it is characterized in that, described processor is also arranged to:
Before described the second information of described extraction,
Whether the chromatic component intra prediction mode set of determining current block comprises LM pattern; And
When determining that the chromatic component intra prediction mode set of current block does not comprise LM pattern, the described first information only includes whether the chromatic component intra prediction mode that is used to indicate described current block is the information of DM pattern;
When determining that the chromatic component intra prediction mode set of current block comprises LM pattern, the described first information also comprises whether the chromatic component intra prediction mode that is used to indicate described current block is the information of LM pattern.
26. decoding devices according to claim 25, is characterized in that, described processor is also arranged to:
Described when can not determine the chromatic component intra prediction mode of described current block according to the described first information, extract the second information in described code stream; Determine the chromatic component intra prediction mode of described current block according to described the second information after,
When the chromatic component intra prediction mode of the described current block of determining according to the described first information neither DM pattern neither LM pattern time, further determines that whether the intra prediction mode of luminance component of described current block identical with the chromatic component intra prediction mode of the described current block of determining according to described the second information;
When the intra prediction mode of luminance component of described current block is identical with the chromatic component intra prediction mode of described definite described current block, use alternative patterns to replace the chromatic component intra prediction mode of described definite described current block, wherein said alternative patterns is all one of different patterns of pattern in the chromatic component intra prediction mode set from current block
When the intra prediction mode of luminance component of described current block is not identical with the chromatic component intra prediction mode of described definite described current block, the chromatic component intra prediction mode of described definite described current block remains unchanged.
27. according to the decoding device described in claim 24 or 26, it is characterized in that, described alternative patterns comprises: along the directivity predictive mode of upper right lower left.
28. according to the decoding device described in claim 15-27 any one, it is characterized in that, described pattern of surplus comprises: DC pattern, vertical pattern, horizontal pattern, plane mode.
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