CN101500161A - Inter-frame prediction method and apparatus based on adaptive block transformation - Google Patents
Inter-frame prediction method and apparatus based on adaptive block transformation Download PDFInfo
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- 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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- 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
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
Abstract
The invention provides a method for intra-frame prediction based on self-adaptive block transformation and a device thereof, mainly comprising the following steps: an intra-frame prediction mode of an adjacent image block is obtained; when the size of the adjacent image block is not as same as that of the current image block, mapping is carried out and a mapping intra-frame prediction mode under the size of the current image block is obtained according to the adjacent image block intra-frame prediction mode; and according to the obtained mapped intra-frame prediction mode, the intra-frame prediction mode of the current image block is obtained. In the embodiment of the invention, as a realization mode of the intra-frame prediction mode is selected for the current image block according to the intra-frame prediction mode adopted by the adjacent image block, the corresponding intra-frame prediction mode also can be determined for the current image block when the size of the current image block is not as same as that of the adjacent image block, and the intra-frame prediction mode of the current image block and the adjacent image block are not the same as well.
Description
Technical field
The present invention relates to the video coding and decoding technology field, relate in particular to a kind of video compression coding-decoding technology.
Background technology
In video and image coding and decoding process,, need to adopt corresponding compression coding and decoding technology usually for reducing video and the view data data volume when transmitting or store.In video and image compression encoding process, need to adopt converter technique that picture material and information in one sub-picture, the zone are concentrated on a certain specific region after conversion, so that corresponding contents is effectively compressed at video compression algorithm.Specifically a zone in piece image or the image can be divided into plurality of small blocks or subregion (be called sub-piece, also can be referred to as image block), sub-more afterwards piece is that unit carries out conversion.Wherein, the size of sub-piece can but be not limited to 4 * 4 or 8 * 8 etc., corresponding 4 and 8 all is unit with the image pixel.Usually the image block with 16 * 16 is an encoding and decoding processing unit in video and image encoding/decoding, and this unit becomes macro block.A macro block may further be divided into the littler sub-piece of some sizes in addition, and in existing document, sub-piece and macro block all can be referred to as image block.
In carrying out sub-piece partition process, specifically a specific region can be divided according to different sub-block sizes respectively, the sub-piece at different sizes carries out different conversion process then, is called the converter technique of adaptive block size.Here said conversion is meant the data processing method with certain mathematical characteristic, for example DCT (discrete cosine transform), wavelet transformation, integer transform etc.These conversion are represented with matrix form usually in video and image encoding/decoding.
When in the adaptive block sizes converter technique, having multiple pattern conversion, the part macro block can be used alone pattern conversion, described pattern conversion is meant conversion and the corresponding encoding and decoding processing mode of conversion, for example, size is that all sub-pieces all are divided into 8 * 8 sizes in 16 * 16 the macro block, and all sub-pieces all adopt 8 * 8 conversion and with conversion respective coding and decoding technique (promptly adopting a kind of pattern conversion).Simultaneously, sub-piece in the part macro block can use different pattern conversions, for example: in one 16 * 16 macro block,, then can use 4 * 4,4 * 8,8 * 4 and 8 * 8 each self-corresponding pattern conversion respectively if contain 4 * 4,4 * 8,8 * 4 and 8 * more than 8 seed block types.
The converter technique of adaptive block size can combine with infra-prediction techniques.In frame in the encoding and decoding technique, need predict for current to be encoded or decoded image blocks to obtain an intra prediction mode, to be used to carry out respective coding or decode operation.The intra prediction mode that prediction obtains is to determine according to the intra prediction mode of current image block adjacent image piece.Generally, current image block need obtain the intra prediction mode of current image block top piece and/or left side piece, obtains the intra prediction mode of current image block by the method that configures in advance.After obtaining the intra prediction mode of current image block, also can calculate the best intra-frame encoding mode of current image block at coding side, if best frame mode is different with the intra prediction mode of current image block, logical operation and mathematical operation that then described optimum frame inner estimation mode can configure in advance with the intra prediction mode of current image block are calculated the gained result and can be write in the code stream; Information in decoding end then can be according to code stream, obtain the intra prediction mode of current image block by the method identical, the information in current intra prediction mode and the code stream of obtaining is carried out the optimum frame inner estimation mode that pre-set logical operation and mathematical operation obtain current image block with coding side.In the adaptive block transformation technology, when the coded picture block size of current image block to be encoded and adjacent image piece is inconsistent, for example, the present image block size is 8 * 8, the adjacent image block size is 4 * 4 o'clock, then gets and the intra prediction mode of 8 * 84 * 4 nearest intra prediction modes as 8 * 8.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
Above-mentioned prior art provide settled really before the prerequisite of mode of intra prediction mode of image block be: the various predictive mode unanimities that the piece of different size adopts.Therefore, inconsistent in current image block and adjacent image piece size, and adjacent image piece and the various predictive modes of current image block then can't use the aforesaid way prediction to determine the intra prediction mode of current image block when also inconsistent.
Summary of the invention
Embodiments of the invention provide a kind of intra-frame prediction method and device based on adaptive block transformation, so that it is inconsistent in current image block and adjacent image piece size, and when the various predictive modes of adjacent image piece and current image block are also inconsistent, still can accurately determine corresponding intra prediction mode for current image block.
A kind of intra-frame prediction method comprises:
Obtain the intra prediction mode of adjacent image piece;
When the piece size of adjacent image piece and current image block was inconsistent, mapping obtained the mapping intra prediction mode under the current image block size according to adjacent image piece intra prediction mode;
Obtain the current image block intra prediction mode according to the described mapping intra prediction mode that obtains.
A kind of infra-frame prediction device based on adaptive block transformation comprises:
The pattern acquiring unit is used to obtain the intra prediction mode of adjacent image piece;
The model prediction unit is used for when the piece size of adjacent image piece and current image block is inconsistent, and the adjacent image piece intra prediction mode that obtains according to described pattern acquiring unit shines upon the mapping intra prediction mode that obtains under the current image block size.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, because having adopted the intra prediction mode that adopts according to the adjacent image piece is the implementation that current image block is selected intra prediction mode, thereby make in current image block and adjacent image piece size inconsistent, and when the various predictive modes of adjacent image piece and current image block are also inconsistent, still can accurately determine corresponding intra prediction mode for current image block; Simultaneously, can also rise to the accuracy of the intra prediction mode of current image block selection.
Description of drawings
Fig. 1 is the orientation angle schematic diagram of 8 * 8 intra prediction modes that can adopt using in the embodiment of the invention;
Fig. 2 is the orientation angle schematic diagram of 4 * 4 intra prediction modes that can adopt using in the embodiment of the invention;
The structural representation one of the device that Fig. 3 provides for the embodiment of the invention;
The structural representation two of the device that Fig. 4 provides for the embodiment of the invention.
Embodiment
In the embodiment of the invention, the relevant characteristics of directivity of the intra prediction mode (being intra-frame encoding mode) that adopts according to adjacent image piece and current image block, a kind of realization mechanism of selecting intra prediction mode for current image block is provided, so that at the adjacent image piece and current image block is not of uniform size when causing, still can select corresponding intra prediction mode for current image block.
Further, in the adaptive block transformation technology, when if current image block and adjacent image block size are inconsistent, the infra-frame prediction process of current image block comprises: behind the intra prediction mode that obtains the adjacent image piece, the mapping of adjacent image piece intra prediction mode is obtained the mapping intra prediction mode of this adjacent image piece under the current image block size, and can determine the intra prediction mode of current image block according to the mapping intra prediction mode of this adjacent image piece; Specifically can in the intra prediction mode set (being the intra prediction mode that current image block can be selected) of current image block correspondence, select the mapping intra prediction mode of a kind of immediate intra prediction mode of intra prediction mode direction of and this adjacent image piece, and then determine corresponding current image block intra prediction mode as the adjacent image piece.
When comprising a plurality of tops piece or left side piece in the adjacent image piece, then corresponding adjacent image piece intra prediction mode specifically can be determined according to top piece intra prediction mode and left side piece intra prediction mode, wherein, definite mode of corresponding top piece intra prediction mode or left side piece intra prediction mode can comprise: the mean value of orientation angle that calculates the intra prediction mode of a plurality of tops piece or left side piece correspondence, according to described mean value choice direction angle intra prediction mode the most similar in the intra prediction mode that current image block can be selected to this mean value, promptly select the immediate intra prediction mode of orientation angle with this mean value, with as top piece intra prediction mode or left side piece intra prediction mode accordingly.
In the embodiment of the invention, the top piece of adjacent image piece can be image block nearest with the current image block upper left corner on the horizontal direction, two or more during when existing with the current image block upper left corner equidistant image block, then get the image block that obtains at first under the raster scan order as the adjacent image piece; Perhaps, the left side piece of adjacent image piece can be image block nearest with the current image block upper left corner on the vertical direction, two or more during when existing with the current image block upper left corner equidistant image block, then get the image block that obtains at first under the raster scan order as the adjacent image piece.
In the embodiment of the invention, if adjacent image piece intra prediction mode is to determine according to top piece intra prediction mode and left side piece intra prediction mode, then can be with the intra prediction mode of the minimum value in corresponding top piece intra prediction mode and the left side piece intra prediction mode as current image block, promptly select smaller value among both as the intra prediction mode of current image block.
In above-mentioned implementation, alternatively, for ease of determining fast of adjacent image piece intra prediction mode, can also preserve the corresponding relation between the intra prediction mode that intra prediction mode that current image block can select and adjacent image piece can select in advance, facilitate the use corresponding corresponding relation and directly search definite corresponding adjacent image piece intra prediction mode, and then accurately determine corresponding current image block intra prediction mode.
The infra-frame prediction scheme based on adaptive block transformation that the invention described above embodiment provides both can be applied to coding side, also can be applied to decoding end, with the performance and the efficient of effective raising encoding and decoding.
For ease of understanding, be elaborated with of the concrete application of concrete example to the embodiment of the invention below in conjunction with accompanying drawing to the embodiment of the invention.
At first, the intra prediction mode that can adopt different big or small pieces describes for example, is that example describes with 8 * 8 and 4 * 4 specifically:
If the size of current image block is 8 * 8, the intra prediction mode of current image block then, promptly 8 * 8 intra prediction mode can be as shown in table 1:
Table 1
| IntraLumaPredMode (sequence number of intra prediction mode) | Title |
| 0 | Intra_8?x?8_Vertical |
| 1 | Intra_8?x?8_Horizontal |
| 2 | Intra_8?x?8_DC |
| 3 | Intra_8?x?8_Down_Left |
| 4 | Intra_8?x?8_Down_Right |
As shown in Figure 1, in 8 * 8 intra prediction modes, the direction of each intra prediction mode is shown in corresponding arrow line.
If the size of current image block is 4 * 4, the intra prediction mode of current image block then, promptly 4 * 4 intra prediction mode can be as shown in table 2:
Table 2
| IntraLumaPredMode (sequence number of intra prediction mode) | Title |
| 0 | Intra_LumaDown_Left |
| 1 | Intra_Luma_Vertical_Left |
| 2 | Intra_Luma_Vertical |
| 3 | Intra_Luma_Vertical_Right |
| 4 | Intra_Luma_Down_Right |
| 5 | Intra_Luma_Horizontal_Down |
| 6 | Intra_Luma_Horizontal |
| 7 | Intra_Luma_Horizontal_Up |
| 8 | Intra_Luma_DC |
As shown in Figure 2, in 4 * 4 intra prediction modes, the direction of each intra prediction mode is shown in corresponding arrow line.
In the embodiment of the invention, when 4 * 4 and 8 * 8 infra-frame predictions, all need obtain the top piece of current image block and the intra prediction mode of left side piece, be designated as IntraPredModeA and IntraPredModeB, obtain the intra prediction mode IntraPredMode of current image block then by certain computing formula, specifically can be:
IntraPredMode＝Min(IntraPredModeA，IntraPredModeB)；
In the aforementioned calculation formula, if top piece or the size of left side piece and varying in size of current image block, then need the intra prediction mode of corresponding top piece or left side piece is transformed into the intra prediction mode corresponding with the present image block size, promptly IntraPredModeA and I ntraPredModeB are respectively the intra prediction mode of present image block size correspondence.
To the realization of corresponding translation process be described below.
Referring to Fig. 1 and Fig. 2 as can be known, corresponding 4 * 4 and 8 * 8 various intra prediction modes have similitude on direction, for example, 8 * 8 predictive mode 3,1,4,0 respectively with 4 * 4 mode 7 (or 0, the direction of these two kinds of intra prediction modes is similar to 8 * 8 mode 3), 6,4,2 similar.
If current image block is 4 * 4, the adjacent image piece is 8 * 8,4 * 4 then current adjacent image block prediction mode can be sought the intra prediction mode of the intra prediction mode the most similar to the direction of the intra prediction mode of adjacent image piece as current image block in 4 * 4 all intra prediction modes that can adopt, for example, 8 * 8 intra prediction mode 4 is consistent with intra prediction mode 4 directions in 4 * 4.
If current image block is 8 * 8, the adjacent image piece is 4 * 4, then also can be by the most similar intra prediction mode of direction of intra prediction mode in each intra prediction mode of 8 * 8 correspondences of 4 * 4 of searchings, and with this intra prediction mode as 8 * 8 current adjacent image piece, be Intra8 * 8PredModeA or Intra8 * 8PredModeB, can be called Intra8 * 8PredModeN.For example, 4 * 4 adjacent intra prediction mode is 3 or 4, is used for then determining that the parameter I ntra8 * 8PredModeA of intra prediction mode of current image block or the value of Intra8 * 8PredModeB are 4.
Further, for the conversion regime of intra prediction mode between the different masses size, will describe with corresponding concrete transform instances more below.
Transform instances one
Corresponding 8 * 8 and 4 * 4 intra prediction modes that use respectively as shown in Figure 1, 2.If current image block is that 8 * 8 and current image block top piece or left side piece (being the adjacent image piece of current image block) are 4 * 4, then the mode of finding the solution of the predictive mode Intra8 * 8PredModeN of the top of current image block (or left side) piece (N is A or B, and A and B be acute pyogenic infection of finger tip top piece and left side piece respectively) can comprise step:
(1) obtains the intra prediction mode of 4 * 4 of the tops (or left side) adjacent with current image block, (N is A or B to be designated as Intra4 * 4PredModeN, A and B refer to top piece and left side piece respectively), wherein said adjacent 4 * 4 may be defined as and nearest 4 * 4 in the current image block upper left corner, when having equidistant 4 * 4 in two or more and the current image block upper left corner, then get 4 * 4 that obtain at first under the raster scan order;
(2) according to the direction similitude of the intra prediction mode of 4 * 4 and 8 * 8 interblocks corresponding Intra4 * 4PredModeN is mapped as intra prediction mode Intra8 * 8PredModeN under 8 * 8 sizes as 4 * 4 mapping intra prediction mode.
Wherein, in order to improve encoding and decoding end efficient, be convenient to the realization of above-mentioned transfer process, specifically can a question blank be set respectively at the encoding and decoding end, to be used to realizing that piece is of a size of the intra prediction mode mapping between 4 * 4 and 8 * 8, for example, in above-mentioned steps (2), can table look-up and obtain corresponding 4 * 4 mapping intra prediction mode Intra8 * 8PredModeN according to Intra4 * 4PredModeN, particularly, corresponding Intra4 * 4PredModeN is to the mapping relations table of Intra8 * 8PredModeN, and promptly the question blank of using in the mapping process can be as shown in table 3:
Table 3
| Intra4×4PredModeN | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Intra8×8PredModeN | 3 | 0 | 0 | 0 | 4 | 1 | 1 | 1 | 2 |
Wherein, numeral is the sequence number of intra prediction mode in the table.
Wherein, intra prediction mode 8 among Intra4 * 4PredModeN and the intra prediction mode 2 among Intra8 * 8PredModeN all correspond to the DC pattern, and the DC pattern is a kind of special intra prediction mode.
As seen, by above-mentioned table 3, then in encoding-decoding process, can obtain the intra prediction mode of current image block quickly and accurately.
Transform instances two
Current image block is 8 * 8 and current image block top piece or left side piece (being the adjacent image piece of current image block) when being 4 * 4, and the border of current image block (coboundary or left margin) overlaps with two 4 * 4 border.Since these two 4 * 4 all with current 8 * 8 adjacent, at this moment, the processing procedure of obtaining Intra8 * 8PredModeN accordingly can comprise step:
(1) needs to determine two 4 * 4 piece the intra prediction mode adjacent, be designated as Intra4 * 4PredModeN1 and Intra4 * 4PredModeN2 with current image block;
(2) calculate described Intra8 * 8PredModeN according to corresponding Intra4 * 4PredModeN1 and Intra4 * 4PredModeN2, concrete account form can by: calculate the mean value of Intra4 * 4PredModeN1 and the corresponding prediction direction angle of Intra4 * 4PredModeN2, search the intra prediction mode of direction the most similar in the intra prediction mode of 8 * 8 correspondences as described Intra8 * 8PredModeN to this mean value according to described mean value; For example:
If described Intra4 * 4PredModeN1 and Intra4 * 4PredModeN2 are respectively 0 and 4, then its pairing angle is respectively lower-left 45 degree and bottom right 45 degree, mean value is (promptly corresponding corresponding intra prediction mode 2) vertically downward, as seen, it is corresponding with 0 pattern in 8 * 8 corresponding intra prediction modes, so Intra8 * 8PredModeN value is 0;
If Intra4 * 4PredModeN1 and Intra4 * 4PredModeN2 are respectively 0 and 7, then its pairing angle is respectively lower-left 45 degree and upper right 22.5 degree, then mean value is lower-left 33.75 degree, at this moment, corresponding to the intra prediction mode in 8 * 8 the intra prediction mode 4 (lower-left 45 degree) with the mean value that obtains the most approaching, so Intra8 * 8PredModeN value is an intra prediction mode 4.
Transform instances three
Corresponding 8 * 8 and 4 * 4 intra prediction modes that use respectively as shown in Figure 1, 2.If current image block is that 4 * 4 and current image block top piece or left side piece (being the adjacent image piece of current image block) are 8 * 8, then the mode of finding the solution of the predictive mode Intra4 * 4PredModeN of the top of current image block (or left side) piece (N is A or B, and A and B be acute pyogenic infection of finger tip top piece and left side piece respectively) can comprise step:
(1) obtains the intra prediction mode of 8 * 8 of the tops (or left side) adjacent with current image block, (N is A or B to be designated as Intra8 * 8PredModeN, A and B refer to top piece and left side piece respectively), wherein, adjacent 8 * 8 may be defined as and nearest 8 * 8 in the current image block upper left corner, when having equidistant 8 * 8 in two or more and the current image block upper left corner, then get 8 * 8 that obtain at first under the raster scan order;
(2) according to the direction similitude of the intra prediction mode of 4 * 4 and 8 * 8 interblocks Intra8 * 8PredModeN is mapped as 4 * 4 intra prediction mode Intra4 * 4PredModeN under the size as 8 * 8 mapping intra prediction mode.
Wherein, in order to improve encoding and decoding end efficient, be convenient to the realization of above-mentioned transfer process, specifically can a question blank be set respectively at the encoding and decoding end, to be used to realizing that piece is of a size of the intra prediction mode mapping between 4 * 4 and 8 * 8, for example, in above-mentioned steps (2), can table look-up and obtain corresponding 8 * 8 mapping intra prediction mode Intra4 * 4PredModeN according to Intra8 * 8PredModeN, particularly, corresponding Intra8 * 8PredModeN is to the mapping relations table of Intra4 * 4PredModeN, and promptly the question blank of using in the mapping process can be as shown in table 4:
Table 4
| Intra8×8PredModeN | 0 | 1 | 2 | 3 | 4 |
| Intra4×4PredModeN | 2 | 6 | 8 | 0 | 4 |
Wherein, numeral is the sequence number of intra prediction mode in the table.
Except that realizing that by the above-mentioned implementation of setting up fixing mapping table at the encoding and decoding end 8 * 8 are waited intra prediction mode between the different size piece shines upon with 4 * 4, also can shine upon by the intra prediction mode that the relation between the prediction direction of different masses size is carried out between the different size piece.
Transform instances four
In this transform instances, the processing procedure that corresponding conversion obtains the current image block intra prediction mode specifically can comprise four kinds of situations, with corresponding 8 * 8 and 4 * 4 be example, corresponding 8 * 8 and 4 * 4 use intra prediction modes as shown in Figure 1, 2 respectively.
Corresponding current image block will have four kinds of different possibilities with the size of adjacent image piece, specifically can adopt the intra prediction mode of different current blocks to determine scheme according to different situations, below will be respectively definite mode of the intra prediction mode of the current block under these four kinds of situations be described:
(1) current image block is 8 * 8, be all 4 * 4 with the current image block upper left corner immediate top piece and left side piece, if when having the equidistant adjacent image piece in two or more and the current image block upper left corner, then get the adjacent image piece that obtains at first under the raster scan order;
Under situation (1), can obtain first intra prediction mode by predetermined rule by the top piece of image block before described and the intra prediction mode of left side piece, in the intra prediction mode set of current image block correspondence, obtain the intra prediction mode corresponding (i.e. the mapping intra prediction mode of the adjacent image piece that mapping obtains) as the current image block intra prediction mode with first intra prediction mode, wherein, corresponding predetermined rule can be for carrying out infra-frame prediction by the size of top piece and left side piece; Be specifically as follows: obtain the current image block intra prediction mode that current image block is of a size of at 4 * 4 o'clock by the method that configures in advance earlier, be designated as Intra4 * 4PredMode; Because current image block is of a size of 8 * 8, so also acquired 4 * 4 intra prediction mode Intra4 * 4PredMode need be mapped to the intra prediction mode (i.e. 4 * 4 mapping intra prediction mode) of current image block, corresponding mapping method is with transform instances one, and then obtains corresponding current image block intra prediction mode.
(2) current image block is 4 * 4, be all 8 * 8 with the current image block upper left corner immediate top piece and left side piece, if when having the equidistant adjacent image piece in two or more and the current image block upper left corner, then get the adjacent image piece that obtains at first under the raster scan order;
Under situation (2), even the top piece of current image block is different with the current block size with left side piece, then in the intra prediction mode set of current image block correspondence, obtain the intra prediction mode (i.e. mapping obtains the mapping intra prediction mode of top piece and left side piece correspondence) of top piece and left side piece correspondence, and obtain the current image block intra prediction mode according to the mapping intra prediction mode of top piece that obtains and left side piece according to top piece and left side piece intra prediction mode; Be specifically as follows: earlier the intra prediction mode that piece is of a size of 8 * 8 adjacent image piece (top piece and left side piece) shines upon, to obtain to be of a size of the mapping intra prediction mode of 8 * 8 adjacent image piece, mapping method is with transform instances three, then, determine the current image block intra prediction mode according to the intra prediction mode of the adjacent image piece after the mapping again;
(3) current image block is 8 * 8, with the current image block upper left corner immediate top piece or left side piece be 4 * 4, with the current image block upper left corner immediate left side piece or top piece be 8 * 8, promptly with the upper left corner of current image block immediate top piece and left side piece in one be 4 * 4, another is 8 * 8, if when having the equidistant adjacent image piece in two or more and the current image block upper left corner, then get the adjacent image piece that obtains at first under the raster scan order;
Under situation (3), even the size of the size of the top piece of current image block or a piece in the piece of the left side and current block is inconsistent, the size of another piece and the consistent size of current block, then will with the intra prediction mode of the top piece of the consistent size of current block or left side piece as the current block intra prediction mode, with reference to this embodiment, then the current image block intra prediction mode equals the intra prediction mode that piece is of a size of 8 * 8 adjacent image piece;
(4) current image block is 4 * 4, with the current image block upper left corner immediate top piece or left side piece be 8 * 8, with the current image block upper left corner immediate left side piece or top piece be 4 * 4, promptly with the upper left corner of current image block immediate top piece and left side piece in one be 4 * 4, another is 8 * 8, if when having the equidistant adjacent image piece in two or more and the current image block upper left corner, then get the adjacent image piece that obtains at first under the raster scan order.
Under situation (4), according to the size of current block inconsistent top piece or left side piece intra prediction mode, in the inner estimation mode set of current image block correspondence, obtain the intra prediction mode (i.e. mapping obtains the mapping intra prediction mode of this top piece or left side piece correspondence) of this top piece or left side piece correspondence, according to the mapping intra prediction mode of top piece that obtains or left side piece, and obtain the current image block intra prediction mode with the adjacent block intra prediction mode of current block consistent size; Be specifically as follows: the intra prediction mode that earlier piece is of a size of 8 * 8 adjacent image piece shines upon, to obtain the mapping intra prediction mode that piece is of a size of 8 * 8 adjacent image piece, mapping method is with transform instances three, then, obtain the current image block intra prediction mode according to the intra prediction mode of 8 * 8 in adjacent image piece mapping acquisitions and the intra prediction mode of 4 * 4 correspondences in the adjacent image piece.
Obtain by above method after the intra prediction mode of current image block, also can calculate the best intra-frame encoding mode of current image block at coding side, if best frame mode is different with the intra prediction mode of current image block, logical operation and mathematical operation that then described optimum frame inner estimation mode can configure in advance with the intra prediction mode of current image block are calculated the gained result and can be write in the code stream; In decoding end, can be according to the information that receives in the encoding code stream, obtain the result of described logical operation of being scheduled to and mathematical operation, and adopt the inverse operation of described logical operation and mathematical operation to obtain the optimum frame inner estimation mode of current image block according to this result, specifically can be according to information in the code stream, obtain the intra prediction mode of current image block by the method identical, the information in current intra prediction mode and the code stream of obtaining is carried out the optimum frame inner estimation mode that obtains current image block with logical operation that configures earlier and mathematical operation with coding side.
A kind of infra-frame prediction device also is provided in the embodiment of the invention, and its specific implementation structure can comprise as shown in Figure 3 and Figure 4:
(1) pattern acquiring unit is used to obtain the intra prediction mode of adjacent image piece, and particularly, the adjacent image piece can comprise at least one top piece and at least one left side piece;
(2) model prediction unit is used for when the piece size of adjacent image piece and current image block is inconsistent, and the adjacent image piece intra prediction mode that obtains according to described pattern acquiring unit shines upon the mapping intra prediction mode that obtains under the current image block size; For example, in the intra prediction mode set (being the intra prediction mode that current image block can be selected) of current image block correspondence, select an intra prediction mode to be used to obtain the current image block intra prediction mode according to adjacent image piece intra prediction mode;
As shown in Figure 3, corresponding model prediction unit specifically can comprise at least one in following four unit, and corresponding four unit comprise:
The first model prediction unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and under the top piece situation different with the current block size with left side piece, obtain first intra prediction mode by the top piece of described current image block and the intra prediction mode of left side piece by predetermined rule, in the intra prediction mode set of current image block correspondence, obtain the intra prediction mode corresponding (promptly mapping obtains the corresponding mapping intra prediction mode under the current image block size according to first intra prediction mode) as the current image block intra prediction mode with first intra prediction mode;
The second model prediction unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and under the top piece situation different with the current block size with left side piece, in the intra prediction mode set of current image block correspondence, obtain the intra prediction mode (promptly obtaining the mapping intra prediction mode of top piece and left side piece correspondence) of top piece and left side piece correspondence according to top piece and left side piece intra prediction mode, obtain the current image block intra prediction mode according to the mapping intra prediction mode of top piece that obtains and left side piece according to top piece and the mapping of left side piece intra prediction mode;
The three-mode predicting unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and the size of a piece in top piece or the left side piece and the size of current block are inconsistent, under the situation of the size of another piece and the consistent size of current block, will with the intra prediction mode of the top piece of the consistent size of current block or left side piece as the current block intra prediction mode;
The four-mode predicting unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and the size of a piece in top piece or the left side piece and the size of current block are inconsistent, under the situation of the size of another piece and the consistent size of current block, according to the size of current block inconsistent top piece or left side piece intra prediction mode, in the intra prediction mode set of current image block correspondence, obtain the intra prediction mode (promptly shining upon the mapping intra prediction mode that obtains this top piece or left side piece correspondence) of this top piece or left side piece correspondence according to the size of current block inconsistent top piece or left side piece intra prediction mode, according to the mapping intra prediction mode of top piece that obtains or left side piece, and obtain the current image block intra prediction mode with the adjacent block intra prediction mode of current block consistent size.
Further, as shown in Figure 4, this model prediction unit specifically can comprise:
The pattern acquiring unit, the immediate intra prediction mode of intra prediction mode direction of the adjacent image piece that a kind of and described pattern acquiring unit of intra prediction mode selection that is used for can selecting in current image block obtains is as adjacent image piece intra prediction mode;
Pattern determining unit is used for determining according to the adjacent image piece intra prediction mode that described pattern acquiring unit obtains the intra prediction mode of current image block.
Wherein, if when comprising a plurality of tops piece or left side piece in the described adjacent image piece, then corresponding pattern acquiring unit needs to determine corresponding top piece intra prediction mode and left side piece intra prediction mode according to a plurality of tops piece or left side piece respectively, so this pattern acquiring unit specifically can comprise:
Average calculation unit is used to calculate the mean value of orientation angle of the intra prediction mode of a plurality of tops piece or left side piece correspondence;
Adjacent image block mode determining unit, be used for mean value according to described average calculation unit acquisition, the choice direction angle intra prediction mode the most similar in the intra prediction mode that current image block can be selected to this mean value, promptly in the intra prediction mode that current image block can be selected, determine and the corresponding intra prediction mode of the immediate orientation angle of the mean value of this orientation angle, as top piece intra prediction mode or left side piece intra prediction mode.
In pattern determining unit, for determining the intra prediction mode of current image block according to adjacent image piece intra prediction mode, then this pattern determining unit specifically can comprise with lower unit:
Comparing unit is used for when the adjacent image piece comprises top piece and left side piece, relatively top piece intra prediction mode and left side piece intra prediction mode;
The present mode determining unit, be used for comparative result according to described comparing unit, with the intra prediction mode of the minimum value in top piece intra prediction mode and the left side piece intra prediction mode, promptly select smaller value among both as the intra prediction mode of current image block as described current image block.
Need to prove that in corresponding infra-frame prediction device, corresponding model prediction unit specifically can comprise each unit that the model prediction unit is comprised separately among Fig. 3 and Fig. 4 simultaneously.
Alternatively, in this device, can also comprise corresponding relation preservation unit, be used to preserve the corresponding relation between the intra prediction mode that intra prediction mode that current image block can select and adjacent image piece can select, this corresponding relation specifically is used to offer described model prediction unit, so that not simultaneously in current image block and adjacent image piece size, can be used for determining corresponding adjacent image piece intra prediction mode (promptly the intra prediction mode that can select at current block selects to determine the intra prediction mode of corresponding intra prediction mode as the adjacent image piece according to the intra prediction mode of adjacent image piece correspondence for the adjacent image piece), and then the intra prediction mode of definite current block.
Alternatively, for further accurately selecting to determine the adjacent image piece, then this device can also comprise adjacent image piece selected cell, be used for will with the nearest image block in the current image block upper left corner as the adjacent image piece, two or more during when existing with the current image block upper left corner equidistant image block, then get the image block that obtains at first under the raster scan order as the adjacent image piece.
Above-mentioned infra-frame prediction device based on adaptive block transformation specifically can be arranged in the code device of coding side, also can be arranged in the decoding device of decoding end, so that encoding and decoding performance and efficient in the raising coding/decoding system.
If be arranged in the code device, then corresponding infra-frame prediction device can also comprise the pattern-coding unit, be used to calculate the best intra-frame encoding mode of current image block, if this best intra-frame encoding mode is different with the current image block intra prediction mode of acquisition, then logical operation and the mathematical operation that described optimum frame inner estimation mode and current image block intra prediction mode are scheduled to, and will calculate the result who obtains and can write in the encoding code stream.
If be arranged in the decoding device, then corresponding infra-frame prediction device can also comprise the mode decoding unit, be used for according to the information that receives encoding code stream, obtain the result of described logical operation of being scheduled to and mathematical operation, and adopt the inverse operation of described logical operation and mathematical operation to obtain the optimum frame inner estimation mode of current image block according to this result.
Above-mentioned encoding apparatus and decoding apparatus can be formed a system and use.
In sum, the realization of the embodiment of the invention, make and between current image block and adjacent image piece, be the different size piece, and under the intra prediction mode different situations that the different size piece adopts separately, still can determine the intra prediction mode of current image block exactly, thereby be convenient to the realization of coding-decoding operation process, improve the performance of encoding and decoding.And, in the embodiment of the invention, can also will determine that the corresponding relation that needs in the current image block intra prediction mode preserves in advance, thereby can further improve corresponding encoding-decoding efficiency.
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 (21)
1, a kind of intra-frame prediction method is characterized in that, comprising:
Obtain the intra prediction mode of adjacent image piece;
When the piece size of adjacent image piece and current image block was inconsistent, mapping obtained the mapping intra prediction mode under the current image block size according to adjacent image piece intra prediction mode;
Obtain the current image block intra prediction mode according to the described mapping intra prediction mode that obtains.
2, method according to claim 1 is characterized in that, described adjacent image piece comprises the top piece of current image block, left side piece.
3, method according to claim 1 is characterized in that, the process of described acquisition current image block intra prediction mode comprises:
If top piece and top piece and the left side piece consistent size different with the current block size of current image block with left side piece, then the intra prediction mode of top piece by described current image block and left side piece obtains first intra prediction mode by predetermined rule, will obtain mapping intra prediction mode under the current image block size as the current image block intra prediction mode according to the mapping of first intra prediction mode.
4, method according to claim 3 is characterized in that, described predetermined rule comprises: the size by top piece and left side piece is carried out infra-frame prediction.
5, method according to claim 1 is characterized in that, the process of described acquisition current image block intra prediction mode comprises:
If the top piece of current image block is different with the current block size with left side piece, then mapping obtains the top piece under the current image block size and the mapping intra prediction mode of left side piece according to top piece and left side piece intra prediction mode, obtains the current image block intra prediction mode according to the mapping intra prediction mode of described top piece and left side piece.
6, method according to claim 1, it is characterized in that, if the size of the top piece of current image block or a piece in the piece of the left side and the size of current block are inconsistent, the size of another piece and the consistent size of current block, the process of then described acquisition current image block intra prediction mode comprises:
Will with the intra prediction mode of the top piece of the consistent size of current block or left side piece as the current block intra prediction mode;
Perhaps,
To shine upon the mapping intra prediction mode that obtains under the current image block size with the size of current block inconsistent top piece or left side piece intra prediction mode, according to the mapping intra prediction mode of top piece that obtains or left side piece, and obtain the current image block infra-frame prediction with the adjacent image piece intra prediction mode of current block consistent size.
According to each described method of claim 1 to 6, it is characterized in that 7, when comprising a plurality of tops piece or left side piece in the described adjacent image piece, then this method also comprises:
Calculate the mean value of orientation angle of the intra prediction mode of a plurality of tops piece correspondence, according to described mean value choice direction angle intra prediction mode the most similar in the intra prediction mode that current image block can be selected, as the top piece intra prediction mode of top piece correspondence to this mean value;
Perhaps,
Calculate the mean value of orientation angle of the intra prediction mode of a plurality of left sides piece correspondence, according to described mean value choice direction angle intra prediction mode the most similar in the intra prediction mode that current image block can be selected, as the left side piece intra prediction mode of left side piece correspondence to this mean value.
8, according to each described method of claim 1 to 6, it is characterized in that, described top piece is an image block nearest with the current image block upper left corner on the horizontal direction, two or more during when existing with the current image block upper left corner equidistant image block, then get the image block that obtains at first under the raster scan order as the adjacent image piece; Perhaps, described left side piece is an image block nearest with the current image block upper left corner on the vertical direction, two or more during when existing with the current image block upper left corner equidistant image block, then get the image block that obtains at first under the raster scan order as the adjacent image piece.
9, according to each described method of claim 1 to 6, it is characterized in that the described process that obtains described mapping intra prediction mode comprises: in the intra prediction mode set of current image block correspondence, select the mapping intra prediction mode of the immediate intra prediction mode of intra prediction mode direction of a kind of and described adjacent image piece as the adjacent image piece.
10, according to each described method of claim 1 to 6, it is characterized in that, this method also comprises: obtain the corresponding relation between the intra prediction mode of the intra prediction mode of first size image block and the second sized image piece, described corresponding relation is used for obtaining described current image block intra prediction mode in current image block and adjacent image piece size not simultaneously.
11, according to each described method of claim 1 to 6, it is characterized in that, the described mapping intra prediction mode process that mapping obtains under the current image block size according to adjacent image piece intra prediction mode specifically comprises: according to the intra prediction mode of adjacent image piece size, by tabling look-up or the predetermined described mapping intra prediction mode under the current block size of computation rule acquisition.
According to each described method of claim 1 to 7, it is characterized in that 12, described intra prediction mode is the intra prediction mode of 4 * 4 sizes, then the mapping relations of the intra prediction mode of the intra prediction mode to 8 of 4 * 4 sizes * 8 size are:
Wherein, numeral is the sequence number of intra prediction mode in the table.
According to each described method of claim 1 to 7, it is characterized in that 13, described intra prediction mode is the intra prediction mode of 8 * 8 sizes, then the mapping relations of the intra prediction mode of the intra prediction mode to 4 of 8 * 8 sizes * 4 size are:
Wherein, numeral is the sequence number of intra prediction mode in the table.
14, a kind of infra-frame prediction device based on adaptive block transformation is characterized in that, comprising:
The pattern acquiring unit is used to obtain the intra prediction mode of adjacent image piece;
The model prediction unit is used for when the piece size of adjacent image piece and current image block is inconsistent, and the adjacent image piece intra prediction mode that obtains according to described pattern acquiring unit shines upon the mapping intra prediction mode that obtains under the current image block size.
15, device according to claim 14 is characterized in that, institute model prediction unit specifically comprises:
The first model prediction unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and under the top piece situation different with the current block size with left side piece, obtain first intra prediction mode by the top piece of described current image block and the intra prediction mode of left side piece by predetermined rule, will obtain the corresponding mapping intra prediction mode under the current image block size as the current image block intra prediction mode according to the mapping of first intra prediction mode.
16, device according to claim 14 is characterized in that, described model prediction unit specifically comprises:
The second model prediction unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and under the top piece situation different with the current block size with left side piece, shine upon the mapping intra prediction mode that obtains top piece and left side piece correspondence according to top piece and left side piece intra prediction mode, according to the mapping intra prediction mode acquisition current image block intra prediction mode of top piece that obtains and left side piece.
17, device according to claim 16 is characterized in that, described model prediction unit specifically comprises:
The three-mode predicting unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and the size of a piece in top piece or the left side piece and the size of current block are inconsistent, under the situation of the size of another piece and the consistent size of current block, will with the intra prediction mode of the top piece of the consistent size of current block or left side piece as the current block intra prediction mode;
Perhaps,
The four-mode predicting unit, be used for comprising top piece and left side piece at the adjacent block of current image block, and the size of a piece in top piece or the left side piece and the size of current block are inconsistent, under the situation of the size of another piece and the consistent size of current block, to obtain this top piece or the corresponding mapping intra prediction mode of left side piece with the size of current block inconsistent top piece or the mapping of left side piece intra prediction mode, according to the mapping intra prediction mode of top piece that obtains or left side piece, and obtain the current image block intra prediction mode with the adjacent image piece intra prediction mode of current block consistent size.
18, device according to claim 14 is characterized in that, described model prediction unit specifically comprises:
The pattern acquiring unit is used for selecting the immediate intra prediction mode of intra prediction mode direction of the adjacent image piece that a kind of and described pattern acquiring unit obtains as adjacent image piece intra prediction mode in the set of the intra prediction mode of current image block correspondence;
Pattern determining unit is used for determining according to the adjacent image piece intra prediction mode that described pattern acquiring unit obtains the intra prediction mode of current image block.
19, device according to claim 14 is characterized in that, when comprising a plurality of tops piece or left side piece in the described adjacent image piece, described pattern acquiring unit comprises:
Average calculation unit is used to calculate the mean value of orientation angle of the intra prediction mode of a plurality of tops piece or left side piece correspondence;
Adjacent image block mode determining unit, be used for mean value according to described average calculation unit acquisition, the choice direction angle intra prediction mode the most similar to this mean value in the intra prediction mode set of current image block correspondence is as top piece intra prediction mode or left side piece intra prediction mode.
20, device according to claim 19 is characterized in that, this device also comprises:
Adjacent image piece selected cell, be used for will with the nearest image block in the current image block upper left corner as the adjacent image piece, maybe two or more during with the current image block upper left corner equidistant image block when existing, then get the image block that obtains at first under the raster scan order as the adjacent image piece.
21, according to each described device of claim 14 to 20, it is characterized in that, this device also comprises corresponding relation preservation unit, be used to preserve the corresponding relation between the intra prediction mode that the intra prediction mode that the first size image block can select and the second sized image piece can select, described corresponding relation is used to offer described model prediction unit, so that in current image block and adjacent image piece size not simultaneously, do not determine described current image block intra prediction mode.
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