CN101677406B - Method and apparatus for video encoding and decoding - Google Patents
Method and apparatus for video encoding and decoding Download PDFInfo
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- CN101677406B CN101677406B CN2008102226492A CN200810222649A CN101677406B CN 101677406 B CN101677406 B CN 101677406B CN 2008102226492 A CN2008102226492 A CN 2008102226492A CN 200810222649 A CN200810222649 A CN 200810222649A CN 101677406 B CN101677406 B CN 101677406B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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Abstract
The invention provides a method and apparatus for video encoding and decoding. At the coding end, selection of intra-frame prediction mode of the current coding block can be performed in accordance with adjacent blocks, and encoding operation of the current encoding block can be performed by selection of the intra-frame selection mode, wherein, when the limited DC prediction mode is selected as the intra-frame prediction mode, if the current encoding block is in the same macroblock with each adjacent encoding block, the adjacent blocks are available, otherwise, all the adjacent blocks are unavailable; or, if at least one of the encoded adjacent blocks is the intra-frame prediction block, all the adjacent blocks are unavailable; or, all the adjacent blocks are unavailable. Upon parsing and obtaining the intra-frame prediction mode adopted by the current decoding block at the decoding end, decoding operation can be performed according to the intra-frame prediction mode adopted by the current decoding block which is obtained by parsing. By adopting a limited DC prediction mode, the embodiment of the invention is not only capable of ensuring error recovery performance, but also capable of enhancing encoding efficiency of the intra-frame updating macroblock, as well as improving performance of encoding and decoding.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of video coding and decoding technology.
Background technology
In video communication system, the error code of video data or packet loss can't be avoided usually, for this reason, need to adopt relative measures to improve the anti-error code capacity of video data, so that video information can be recovered from mistake as soon as possible,, the user experiences for providing subjective preferably.
At present, the implementation of a kind of anti-error code that provides is an intra refresh methods, by corresponding frame refreshing, just can to a certain degree realize corresponding mistake recovery.As shown in Figure 1, P frame wherein uses inter-frame mode to encode, corresponding IR frame then is a refresh frame, part or all of macro block in this IR frame adopts intra-frame encoding mode to encode, be inter-coded macroblocks (refreshing macro block) in the IR frame only with reference to the adjacent macroblocks of this frame, use intra-frame encoding mode to encode.
Particularly, inter-coded macroblocks in refresh frame can be with reference to corresponding adjacent macroblocks, wherein, if the inter-coded macroblocks in adjacent macroblocks and the refresh frame is in the same band, then inter-coded macroblocks in this adjacent macroblocks and inter-coded macroblocks all can be used as the reference macroblock of the inter-coded macroblocks in this refresh frame.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In the above-mentioned intra refresh methods, if certain adjacent macroblocks that refreshes macro block is inter prediction macro block (being the P macro block), then because this P macro block may be with reference to P frame before, so this P macro block might be accumulated corresponding transmission error from the reference P frame of front, and this mistake can be passed to and refresh macro block (being the I macro block in the IR frame), make that refreshing macro block also may be subjected to the influence of transmission error, and then reduced the error resilience of intra refresh methods.
Summary of the invention
Embodiments of the invention provide a kind of method and device of coding and decoding video, thereby can guarantee the mistake restorability, improve the encoding and decoding performance.
A kind of method of video coding comprises:
Carry out the selection of the intra prediction mode of present encoding piece according to the predictive mode of adjacent block;
The intra prediction mode of utilize selecting carries out encoding operation to the present encoding piece, wherein, and at the DC of selectional restriction predictive mode during as intra prediction mode, then:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If when at least one in the encoded adjacent block was the inter prediction piece, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
A kind of video coding apparatus comprises:
The intra prediction mode selected cell is used for carrying out according to the predictive mode of adjacent block the selection of the intra prediction mode of present encoding piece;
The first encoding operation unit, the intra prediction mode that is used to utilize described intra prediction mode selected cell to select carries out encoding operation to the present encoding piece, wherein, if the DC predictive mode of selectional restriction is as intra prediction mode, then:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
At least one of encoded adjacent block is the inter prediction piece, and each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
A kind of video frequency decoding method comprises:
Resolve the code stream that needs decoding, obtain the intra prediction mode that current decoding block adopts;
Carry out decode operation according to the intra prediction mode of resolving the current decoding block employing that obtains, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If when at least one was for the inter prediction piece in the adjacent block of having decoded, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
A kind of video decoder comprises:
The intra prediction mode determining unit is used to resolve the encoding code stream that receives, and obtains the intra prediction mode that current decoding block adopts;
The first decode operation unit is used for carrying out decode operation according to the intra prediction mode that the current decoding block that described intra prediction mode determining unit parsing obtains adopts, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If at least one is the inter prediction piece in the adjacent block of having decoded, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
A kind of method of video coding comprises:
Determine the availability of the adjacent block of present encoding piece, comprising:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Availability according to left adjacent block and last adjacent block is carried out encoding operation.
A kind of video coding apparatus comprises:
The first adjacent block availability identification unit is used for determining comprising the availability of the adjacent block of present encoding piece:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
The second encoding operation unit is used for the left adjacent block determined according to the described first adjacent block availability identification unit and the availability of last adjacent block the present encoding piece is carried out encoding operation.
A kind of video frequency decoding method comprises:
Resolve code stream, determine the availability of adjacent block, comprising:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Availability according to left adjacent block and last adjacent block is carried out decode operation.
A kind of video decoder comprises:
The second adjacent block availability identification unit is used to resolve the encoding code stream that receives, and determines the availability of adjacent block, comprising:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
The second decode operation unit is used for the left adjacent block determined according to the described second adjacent block availability identification unit and the availability of last adjacent block current decoding block is carried out decode operation.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, the embodiment of the invention has adopted limited DC prediction mode, perhaps, adopt definite mode of new adjacent block availability to determine the availability of adjacent block, thereby make and both can guarantee the mistake restorability, can also effectively improve frame refreshing macroblock encoding efficient, improve the encoding and decoding performance.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a refresh frame schematic diagram of the prior art;
The structural representation one of the code device that Fig. 2 provides for the embodiment of the invention;
The structural representation one of the decoding device that Fig. 3 provides for the embodiment of the invention;
The structural representation two of the code device that Fig. 4 provides for the embodiment of the invention;
The structural representation two of the decoding device that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The implementation that the embodiment of the invention provides can be realized the flexible selection of reference block in sub-piece aspect, specifically can be in the process selected of the predictive mode of coded sub-blocks to present frame, by being the judgement of Intra-coded blocks (adopting the adjacent block of intra prediction mode coding) or inter-coded block (adopting the adjacent block of inter-frame forecast mode coding) to adjacent block, whether limited DC prediction mode is carried out encoding operation to select current sub-block.In decoding end, can determine then whether coding side adopts corresponding limited DC prediction mode to encode, and carry out corresponding infra-frame prediction decode operation.Perhaps, the availability rule that also can arrange adjacent block is for only when current decoding block and each adjacent block are in same macro block, and each adjacent block can be used, otherwise each adjacent block is all unavailable, and carries out coding-decoding operation according to the availability of corresponding adjacent block.
The code encoding/decoding mode that the embodiment of the invention provides can be when guaranteeing corresponding mistake restorability, and improved frame refreshing macroblock encoding efficient is compressed capability as far as possible.
In the embodiment of the invention, at coding side, specifically can carry out the selection of the intra prediction mode of present encoding piece according to the predictive mode of adjacent block, and utilize the intra prediction mode of selecting that the present encoding piece is carried out encoding operation, wherein, at the DC of selectional restriction predictive mode during as intra prediction mode, then in cataloged procedure:
Only when present encoding piece and each adjacent block are in same macro block, each adjacent block can be used, otherwise, each adjacent block is all unavailable, for example, can be only when the present encoding piece be last luminance block, think that each adjacent block can use, and when the present encoding piece was other pieces, then each adjacent block was unavailable;
Perhaps,
If when at least one in the encoded adjacent block was the inter prediction piece, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
Alternatively, whether adopted limited DC prediction mode for ease of decoding end identification, coding side can also write the sign that whether adopts limited DC prediction mode in encoding code stream; Further, the sign of limited DC prediction mode can write in sequence head, image head, slice header, macro block or the sub-piece of code stream.Perhaps, if acquiescence adopts corresponding limited DC prediction mode, then need not and whether to have adopted the sign of limited DC prediction mode to write in the code stream at coding side.
In the embodiment of the invention,, also can at first determine the availability of the adjacent block of present encoding piece, be specifically as follows at coding side:
Only when present encoding piece and each adjacent block are in same macro block, each adjacent block can be used, otherwise, each adjacent block is all unavailable, for example, can be only when the present encoding piece be last luminance block, think that each adjacent block can use, and when the present encoding piece was other pieces, then each adjacent block was unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
Afterwards, just can carry out the respective coding operation according to the left adjacent block of present encoding piece and the availability of last adjacent block.
In above-mentioned processing procedure, can also comprise: if do not have the inter prediction piece in the left adjacent block of present encoding piece or the last adjacent block, then the left adjacent block of present encoding piece or last adjacent block are available.
In above-mentioned processing procedure, can also in encoding code stream, write out Warning Mark, being used to indicate encoding operation is that the left adjacent block determined according to the foundation aforesaid way and the availability of last adjacent block are carried out.
Alternatively, this Warning Mark specifically can but be not limited to write in sequence head, image head, slice header, macro block or the sub-piece of encoding code stream.
In the embodiment of the invention, resolve the code stream that needs decoding in decoding end, after obtaining the intra prediction mode of current decoding block employing, just can carry out decode operation according to the intra prediction mode of resolving the current decoding block employing that obtains, wherein, corresponding with coding side, if the intra prediction mode that adopts is a limited DC prediction mode, then in decode procedure:
Only when current decoding block and each adjacent block are in same macro block, each adjacent block can be used, otherwise, each adjacent block is all unavailable, for example, only when the present encoding piece was last luminance block, each adjacent block can be used, and when the present encoding piece was other pieces, then corresponding each adjacent block was unavailable;
Perhaps,
If at least one is the inter prediction piece in the adjacent block of having decoded, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
Alternatively, decoding end specifically can be when resolving the sign that obtains the employing limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then determine current decoding block employing is limited DC prediction mode, thereby can carry out decode operation according to limited DC prediction mode; Wherein, the sign of limited DC prediction mode can be resolved acquisition in sequence head, image head, slice header, macro block or the sub-piece of code stream.Perhaps, decoding end also can be given tacit consent to the corresponding limited DC prediction mode of employing.
In the embodiment of the invention, decoding end also can directly be resolved the encoding code stream that receives, and the availability of definite adjacent block, is specifically as follows:
Only when current decoding block and each adjacent block are in same macro block, each adjacent block can be used, otherwise, each adjacent block is all unavailable, for example, only when the present encoding piece was last luminance block, each adjacent block can be used, and when the present encoding piece was other pieces, then corresponding each adjacent block was unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Afterwards, just can carry out corresponding decode operation to current decoding block according to the availability of left adjacent block and last adjacent block.
In above-mentioned processing procedure, can also comprise: if do not have the inter prediction piece in the left adjacent block of current decoding block or the last adjacent block, then the left adjacent block of current decoding block or last adjacent block are available.
In above-mentioned processing procedure, can also resolve encoding code stream, obtain Warning Mark, and determine that according to this indication needs carry out corresponding decode operation according to the definite left adjacent block of foundation aforesaid way and the availability of last adjacent block.
The embodiment of the invention specifically can but be not limited to be applied in the real-time video monitoring system.
Particularly, in the embodiment of the invention, the processing procedure that adopts in coding side and decoding end can but be not limited to may further comprise the steps:
(1) coding side
At coding side, concrete cataloged procedure can comprise:
(1) determines whether current inter-frame encoding frame needs to carry out frame refreshing;
For example, can determine whether this frame needs to refresh, perhaps, also can specify this frame whether to need to refresh by craft such as networking commands with the frame period of some cycles;
(2) if determine that present frame need carry out frame refreshing, then carry out current macro in the present frame of intraframe coding for needs, be also referred to as and refresh macro block, determine the coding mode of this each sub-piece of macro block according to the availability (being the reference macroblock whether adjacent macroblocks can be used as current macro) of the adjacent block that refreshes macro block, promptly select the intra prediction mode of the sub-piece of present encoding;
Wherein, the availability of adjacent block is meant: this adjacent block is encoded, and be in the same band with current block, at this moment, if at least one in top adjacent block or the left side adjacent block is the inter prediction piece, then for the DC predictive mode in the intra prediction mode, determine that adjacent block is all unavailable, perhaps, only when the present encoding piece was last luminance block, each adjacent block can be used, and when the present encoding piece is other pieces, then corresponding each adjacent block is unavailable, and perhaps, each adjacent block of DC pattern-coding piece is all unavailable in this frame; The DC predictive mode of this moment can be called limited DC prediction mode.
(3) from the resulting intra prediction mode to be selected of step (2), select the intra prediction mode of the sub-piece of present encoding;
(4) adopt the intra prediction mode of selecting that the sub-piece of present encoding is carried out encoding operation, and the pairing syntax values of selected intra prediction mode write in the code stream, wherein, if the DC predictive mode of selectional restriction carries out encoding operation, then can also in code stream, write the sign that has used limited DC prediction mode.
(2) decoding end
In decoding end, corresponding decoding processing step can comprise:
(1) obtains code stream, resolve the image head of MB of prediction frame or the other parts in the code stream, obtain the sign whether this frame uses limited DC prediction mode;
(2) if the intra prediction mode of current sub-block (being current decoding block) is the DC predictive mode, then use limited DC prediction mode to carry out the infra-frame prediction of this sub-piece;
Corresponding limited DC prediction mode is meant: the DC predictive mode of current sub-block only uses 128 (or other integers) to carry out the infra-frame prediction decode operation; Perhaps, only when current subcode piece is last luminance block, each adjacent block can be used, and when current decoding block is other sub-pieces, that then corresponding each adjacent block is is unavailable (promptly only at current decoding block during for other sub-pieces, the DC predictive mode of current sub-block only use 128 or other integer carry out the infra-frame prediction decode operation); Perhaps, each adjacent block of the encoding block under all the DC predictive modes in this frame is all unavailable, and this moment, the DC predictive mode of present encoding piece only used 128 (or other integers) to predict.
For ease of understanding, concrete application process of the present invention is elaborated below in conjunction with concrete application example to the embodiment of the invention.
(1) coding side
In the embodiment of the invention, carry out the sub-piece (being the present encoding piece) of intraframe predictive coding for needs, when having an inter prediction piece at least in its left side adjacent block or the top adjacent block, then the respective coding treatment step can comprise:
(1) from the intra prediction mode set that comprises limited DC prediction mode, selects a kind of intra prediction mode, corresponding limited DC prediction mode is meant that this predictive mode can not be with reference to adjacent block, other intra prediction modes then both can be with reference to the intra-frame prediction block in the adjacent block, also can be with reference to the inter prediction piece in the adjacent block; Wherein, select a kind of process of intra prediction mode specifically can adopt each or the multinomial selection of carrying out corresponding intra prediction mode such as RDO (rate-distortion optimization) mode selecting method, mode selecting method, SAD (absolute value difference) mode selecting method or fast algorithm mode selecting method according to the adjacent block availability.
(2) intra prediction mode of use the selecting current sub-piece to be encoded of encoding;
(3) in the encoding code stream that generates, what the current sub-piece to be encoded of the sign mark of use limited DC prediction mode used is limited DC prediction mode;
The sign of limited DC prediction mode specifically can represent with the form of isolated sign in other place of sequence head, image head, slice header, macro block, sub-piece or code stream, can also with the expression that is combined with each other of other syntactic units.
(2) decoding end
In the embodiment of the invention, suppose that with AVS (digital audio/video encoding and decoding technique standard) be example, then the grammatical and semantic in the PB image head that can carry out is amended as follows shown in the boldface type in the table:
| pb_picture_header(){ | Descriptor |
| pb_picture_start_code | f(32) |
| bbv_delay | u(16) |
| picture_coding_type | u(2) |
| If(picture_coding_type＝＝‘01’‖picture_coding_type＝＝‘11’) | |
| limitedDC_prediction_flag | u(1) |
| picture_distance | u(8) |
| .................... | |
| next_start_code() | |
| } |
In last table, limited DC prediction mode sign: limitedDC_prediction_flag is specifically as follows 1 signless integer.For example, can be when it be " 1 ", expression when the coding mode of the brightness of this frame or chrominance block be in the frame during DC predictive mode, except that the sub-piece of last brightness, other sub-piece uses " 128 " to predict, when it is " 0 ", is expressed as and uses normal DC predictive mode; Perhaps, on the contrary the expression also can.
If the image pattern matrix under the current block is I, I can represent brightness or chrominance matrix, and present image is that forward-predictive-coded frames and limitedDC_prediction_flag are ' 1 ', then:
If current intra-frame prediction block is that luminance block and IntraLumaPredMode equal ' 2 ', then the image pattern of the left adjacent block of the 0th, 1 and 2 sub-piece and last adjacent block all is ' unavailable ', and the image pattern of the left adjacent block of the 3rd sub-piece and last adjacent block all is " available ";
If current intra-frame prediction block is that chrominance block and IntraChromaPredMode equal ' 0 ', then the image pattern of the left adjacent block of current block and last adjacent block all is " unavailable ".
In this embodiment, concrete decoding step can comprise following process:
(1) image head of parsing frame of video obtains a designated symbol (promptly whether using the sign of limited DC prediction mode), and this designated symbol specifically is used to indicate the DC predictive mode of this frame whether to use limited DC prediction mode;
In this step, if this frame uses limited DC prediction mode, also can indicate a frame sequence at sequence head, perhaps, also can indicate this frame whether to use limited DC prediction mode, perhaps, also can give tacit consent to whether adopt limited DC prediction mode (at this moment at image head, if acquiescence adopts limited DC prediction mode, then can omit corresponding designated symbol);
(2) decoding obtains the intra prediction mode of a sub-piece;
(3) intra prediction mode as if this sub-piece is the DC predictive mode, and the designated symbol that obtains in the step (1) is for indicating this frame use limited DC prediction mode, then:
If have at least one to be the inter prediction piece in the left or up adjacent block of current block, be luminance block then for current block, then the left adjacent block of the 0th, 1 and 2 sub-piece and last adjacent block are ' unavailable ', and the left adjacent block of the 3rd sub-piece and last adjacent block are ' available '; For current intra-frame prediction block is chrominance block, and then the left adjacent block of current block and last adjacent block are ' unavailable ';
Perhaps,
If have at least one to be the inter prediction piece in the left or up adjacent block of current block, then the left or up adjacent block of current block is ' unavailable ', if do not have the inter prediction piece in the left adjacent block of current block or the last adjacent block, then the left adjacent block of current block or last adjacent block are ' available ';
(4) carry out corresponding infra-frame prediction decode operation, concrete prediction mode can comprise:
If upper left adjacent block is ' available ', the then predicted value under the DC predictive mode all:
predMatrix[x，y]＝((r[x]+2×r[x+1]+r[x+2]+2)>>2+(c[y]+2×c[y+1]+c[y+2]+2)>>2)>>1；
If last adjacent block ' available ', the then predicted value under the DC predictive mode:
predMatrix[x，y]＝(r[x]+2×r[x+1]+r[x+2]+2)>>2；
If left adjacent block ' available ', the then predicted value under the DC predictive mode:
predMatrix[x，y]＝(c[y]+2×c[y+1]+c[y+2]+2)>>2；
If left, last adjacent block is all unavailable, then the predicted value under the DC predictive mode:
PredMatrix[x, y]=128 (x, y=0～7), certainly, should " 128 " also can adopt other numerical value to substitute.
The embodiment of the invention also provides a kind of video coding apparatus, as shown in Figure 2, specifically can comprise:
Intra prediction mode selected cell 201 is used for carrying out according to the predictive mode of adjacent block the selection of the intra prediction mode of present encoding piece;
The first encoding operation unit 202, the intra prediction mode that is used to utilize described intra prediction mode selected cell 201 to select carries out encoding operation to the present encoding piece, wherein, if the DC predictive mode of selectional restriction is as intra prediction mode, then:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable, for example, can be only when the present encoding piece be last luminance block, each adjacent block can be used;
Perhaps,
At least one of the adjacent block of having decoded is the inter prediction piece, and each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
Alternatively, this device can also comprise limited DC prediction mode sign writing unit 203, is used for writing the sign that whether adopts limited DC prediction mode at the encoding code stream that the first encoding operation unit 202 obtains.
The embodiment of the invention also provides a kind of video decoder, as shown in Figure 3, specifically can comprise:
Intra prediction mode determining unit 301 is used to resolve the encoding code stream that receives, and obtains the intra prediction mode that current decoding block adopts; Alternatively, when resolving the sign of acquisition employing limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then determine current decoding block employing is limited DC prediction mode in this intra prediction mode determining unit 301.
The first decode operation unit 302 is used for carrying out decode operation according to the intra prediction mode that the current decoding block that described intra prediction mode determining unit 301 is resolved acquisition adopts, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable, for example, can be only when current decoding block be last luminance block, each adjacent block can be used;
Perhaps,
If when at least one was for the inter prediction piece in the adjacent block of having decoded, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
The embodiment of the invention also provides another kind of video coding apparatus, and as shown in Figure 4, its specific implementation structure can comprise:
The first adjacent block availability identification unit 401 is used for determining comprising the availability of the adjacent block of present encoding piece:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable, for example, can be only when the present encoding piece be last luminance block, each adjacent block can be used;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
Alternatively, this first adjacent block availability identification unit 401 can also comprise: if do not have the inter prediction piece in the left adjacent block of present encoding piece or the last adjacent block, then the left adjacent block of present encoding piece or last adjacent block are available;
The second encoding operation unit 402 is used for the left adjacent block determined according to the above-mentioned first adjacent block availability identification unit 401 and the availability of last adjacent block the present encoding piece is carried out encoding operation.
The embodiment of the invention also provides another kind of video decoder, and as shown in Figure 5, its specific implementation structure can comprise:
The second adjacent block availability identification unit 501 is used to resolve the encoding code stream that receives, and determines the availability of adjacent block, comprising:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable, for example, can be only when current decoding block be last luminance block, each adjacent block can be used;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, each adjacent block can comprise the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Alternatively, this second adjacent block availability identification unit 501 can also comprise: if do not have the inter prediction piece in the left adjacent block of current decoding block or the last adjacent block, then the left adjacent block of current decoding block or last adjacent block are available;
The second decode operation unit 402 is used for the left adjacent block determined according to the above-mentioned second adjacent block availability identification unit 501 and the availability of last adjacent block current decoding block is carried out decode operation.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
In sum, the embodiment of the invention can utilize the inter prediction of stagnant zone to reduce code check, the intraframe predictive coding that the moving region is limited guarantees the error protection diffusion function of this frame, thereby improves video after overcompression and transmission, in the subjective and objective quality of the display video of decoding end.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (23)
1. the method for a video coding is characterized in that, comprising:
Carry out the selection of the intra prediction mode of present encoding piece according to the predictive mode of adjacent block;
The intra prediction mode of utilize selecting carries out encoding operation to the present encoding piece, wherein, and at the DC of selectional restriction predictive mode during as intra prediction mode, then:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If when at least one in the encoded adjacent block was the inter prediction piece, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
2. method according to claim 1 is characterized in that, also comprises:
In encoding code stream, write the sign that whether adopts limited DC prediction mode;
Perhaps,
Acquiescence adopts limited DC prediction mode.
3. method according to claim 2 is characterized in that, whether described writing in encoding code stream adopts the sign of limited DC prediction mode to comprise:
The described sign of limited DC prediction mode that whether adopts is write in sequence head, image head, slice header, macro block or the sub-piece of encoding code stream.
4. a video coding apparatus is characterized in that, comprising:
The intra prediction mode selected cell is used for carrying out according to the predictive mode of adjacent block the selection of the intra prediction mode of present encoding piece;
The first encoding operation unit, the intra prediction mode that is used to utilize described intra prediction mode selected cell to select carries out encoding operation to the present encoding piece, wherein, if the DC predictive mode of selectional restriction is as intra prediction mode, then:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
At least one of encoded adjacent block is the inter prediction piece, and each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top.
5. device according to claim 4 is characterized in that, this device also comprises:
Limited DC prediction mode sign writing unit is used for writing the sign that whether adopts limited DC prediction mode at encoding code stream.
6. a video frequency decoding method is characterized in that, comprising:
Resolve the code stream that needs decoding, obtain the intra prediction mode that current decoding block adopts;
Carry out decode operation according to the intra prediction mode of resolving the current decoding block employing that obtains, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If when at least one was for the inter prediction piece in the adjacent block of having decoded, each adjacent block was all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
7. method according to claim 6 is characterized in that, the process of the intra prediction mode that the current decoding block of described acquisition adopts comprises:
Resolve when obtaining to adopt the sign of limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then current decoding block adopted is limited DC prediction mode;
Perhaps,
What give tacit consent to current decoding block employing is limited DC prediction mode.
8. method according to claim 7 is characterized in that, the process that described parsing obtains the sign of employing limited DC prediction mode comprises:
Resolve the sign of sequence head, image head, slice header, macro block or sub-piece acquisition employing limited DC prediction mode in the code stream.
9. a video decoder is characterized in that, comprising:
The intra prediction mode determining unit is used to resolve the encoding code stream that receives, and obtains the intra prediction mode that current decoding block adopts;
The first decode operation unit is used for carrying out decode operation according to the intra prediction mode that the current decoding block that described intra prediction mode determining unit parsing obtains adopts, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If at least one is the inter prediction piece in the adjacent block of having decoded, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top.
10. device according to claim 9, it is characterized in that, described intra prediction mode determining unit is when resolving the sign that obtains the employing limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then current decoding block adopted is limited DC prediction mode.
11. the method for a video coding is characterized in that, comprising:
Determine the availability of the adjacent block of present encoding piece, comprising:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Availability according to left adjacent block and last adjacent block is carried out encoding operation.
12. method according to claim 11 is characterized in that, this method also comprises:
Write out Warning Mark in encoding code stream, being used to indicate encoding operation is to carry out according to the availability of described left adjacent block and last adjacent block.
13. method according to claim 12 is characterized in that, described Warning Mark writes in sequence head, image head, slice header, macro block or the sub-piece of encoding code stream.
14. a video coding apparatus is characterized in that, comprising:
The first adjacent block availability identification unit is used for determining comprising the availability of the adjacent block of present encoding piece:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of present encoding piece, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
The second encoding operation unit is used for the left adjacent block determined according to the described first adjacent block availability identification unit and the availability of last adjacent block the present encoding piece is carried out encoding operation.
15. a video frequency decoding method is characterized in that, comprising:
Resolve code stream, determine the availability of adjacent block, comprising:
Only when current decoding block and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, then each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of current decoding block or at least one item in the adjacent block of top;
Availability according to left adjacent block and last adjacent block is carried out decode operation.
16. method according to claim 15 is characterized in that, this method also comprises:
Resolve code stream, obtain Warning Mark, determine that according to this indication needs carry out decode operation according to the availability of described left adjacent block and last adjacent block.
17. a video decoder is characterized in that, comprising:
The second adjacent block availability identification unit is used to resolve the encoding code stream that receives, and determines the availability of adjacent block, comprising:
Only when present encoding piece and each adjacent block were in same macro block, each adjacent block can be used, otherwise each adjacent block is all unavailable;
Perhaps,
If have an inter prediction piece at least in the left adjacent or last adjacent block of current decoding block, each adjacent block is all unavailable;
Perhaps,
Each adjacent block is all unavailable;
Wherein, described each adjacent block comprises the left side adjacent block of present encoding piece or at least one item in the adjacent block of top;
The second decode operation unit is used for the left adjacent block determined according to the described second adjacent block availability identification unit and the availability of last adjacent block current decoding block is carried out decode operation.
18. a video frequency decoding method is characterized in that, comprising:
Resolve the code stream that needs decoding, obtain the intra prediction mode that current decoding block adopts;
Carry out decode operation according to the intra prediction mode of resolving the current decoding block employing that obtains, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
If current intra-frame prediction block is a luminance block and for the DC pattern, then the left adjacent block of the 0th, 1 and 2 sub-piece and the image pattern of going up adjacent block all be ' unavailable ', the left adjacent block of the 3rd sub-piece and upward the image pattern of adjacent block all be " available ";
If current intra-frame prediction block is chrominance block and is the DC pattern that then the image pattern of the left adjacent block of current block and last adjacent block all is " unavailable ".
19. method according to claim 18 is characterized in that, the process of the intra prediction mode that the current decoding block of described acquisition adopts comprises:
Resolve when obtaining to adopt the sign of limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then current decoding block adopted is limited DC prediction mode;
Perhaps,
What give tacit consent to current decoding block employing is limited DC prediction mode.
20. method according to claim 18 is characterized in that, the process that described parsing obtains the sign of employing limited DC prediction mode comprises:
Resolve the sign of sequence head, image head, slice header, macro block or sub-piece acquisition employing limited DC prediction mode in the code stream.
21. a video frequency decoding method is characterized in that, comprising:
Resolve the code stream that needs decoding, obtain the intra prediction mode that current decoding block adopts;
Carry out decode operation according to the intra prediction mode of resolving the current decoding block employing that obtains, wherein, if the intra prediction mode that adopts is a limited DC prediction mode, then:
Only current decoding block and left adjacent block and on adjacent block in same macro block the time, left adjacent block and go up adjacent block and can use, otherwise, left adjacent block and to go up adjacent block all unavailable;
Perhaps,
If the left adjacent block of having decoded and going up when at least one is for the inter prediction piece in the adjacent block, left adjacent block and to go up adjacent block all unavailable;
Perhaps,
Left side adjacent block and last adjacent block are all unavailable.
22. method according to claim 21 is characterized in that, the process of the intra prediction mode that the current decoding block of described acquisition adopts comprises:
Resolve when obtaining to adopt the sign of limited DC prediction mode, if the intra prediction mode that current decoding block adopts is the DC predictive mode, what then current decoding block adopted is limited DC prediction mode;
Perhaps,
What give tacit consent to current decoding block employing is limited DC prediction mode.
23. method according to claim 22 is characterized in that, the process that described parsing obtains the sign of employing limited DC prediction mode comprises:
Resolve the sign of sequence head, image head, slice header, macro block or sub-piece acquisition employing limited DC prediction mode in the code stream.
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| CN102547270B (en) * | 2010-12-31 | 2014-03-19 | 联芯科技有限公司 | Method and system for obtaining availability information of adjacent blocks of current block |
| JP5781313B2 (en) * | 2011-01-12 | 2015-09-16 | 株式会社Ｎｔｔドコモ | Image prediction coding method, image prediction coding device, image prediction coding program, image prediction decoding method, image prediction decoding device, and image prediction decoding program |
| CN102611882B (en) * | 2011-01-19 | 2014-02-26 | 华为技术有限公司 | Encoding and decoding method and device |
| KR101383775B1 (en) * | 2011-05-20 | 2014-04-14 | 주식회사 케이티 | Method And Apparatus For Intra Prediction |
| CN102857764B (en) | 2011-07-01 | 2016-03-09 | 华为技术有限公司 | The method and apparatus of intra prediction mode process |
| HUE055825T2 (en) | 2011-10-18 | 2021-12-28 | Lg Electronics Inc | Method for intra prediction and device therefor |
| CN103067699B (en) * | 2011-10-20 | 2018-02-16 | 中兴通讯股份有限公司 | A kind of intra-frame prediction mode encoder, decoder and its method and electronic equipment |
| KR20130049526A (en) | 2011-11-04 | 2013-05-14 | 오수미 | Method for generating reconstructed block |
| TWI580264B (en) * | 2011-11-10 | 2017-04-21 | Sony Corp | Image processing apparatus and method |
| CN110545421B (en) | 2012-10-12 | 2022-11-22 | 韩国电子通信研究院 | Image encoding/decoding method and apparatus using the same |
| WO2015096093A1 (en) * | 2013-12-26 | 2015-07-02 | Mediatek Singapore Pte. Ltd. | Simplified cabac contexts in 3dvc |
| US11496747B2 (en) | 2017-03-22 | 2022-11-08 | Qualcomm Incorporated | Intra-prediction mode propagation |
| CN111641824B (en) * | 2019-03-01 | 2022-08-05 | 杭州海康威视数字技术股份有限公司 | Video reverse playing method and device |
| CN112839224B (en) * | 2019-11-22 | 2023-10-10 | 腾讯科技（深圳）有限公司 | Prediction mode selection method and device, video coding equipment and storage medium |
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