CN101483780A - Method and apparatus for intra-frame prediction - Google Patents
Method and apparatus for intra-frame prediction Download PDFInfo
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- CN101483780A CN101483780A CNA2008100256563A CN200810025656A CN101483780A CN 101483780 A CN101483780 A CN 101483780A CN A2008100256563 A CNA2008100256563 A CN A2008100256563A CN 200810025656 A CN200810025656 A CN 200810025656A CN 101483780 A CN101483780 A CN 101483780A
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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
- H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
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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
- H04N19/102—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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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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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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
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Abstract
This invention discloses an in-frame forecasting method, comprising: obtaining a current block in the frame for pixel value forecasting, determining pixel forecasting value of the current block in current pattern direction according to forecasting mode direction of block adjacent to the current block and/or reference pixel value of the adjacent block. This invention also discloses an in-frame forecasting device. With application of this invention, pattern distribution continuity of current block can be remained during forecasting of pixel value of current block and forecasting precision can be ensured simply and conveniently.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method of intra-prediction and a kind of infra-frame prediction device.
Background technology
In video coding, the intraframe coding compression ratio is very low, does not rely on the coded frame of front during intraframe coding, thereby can decode mustn't go under the situation of previous frame.Information around Intra-coded blocks is used is predicted, specification is that the sub-piece of brightness of (4 pixels * 4 pixels) or the luminance block of (8 pixels * 8 pixels) have 9 kinds of different predictive modes, be specially prediction and a kind of direct current (Direct Current of 8 kinds of different predictive mode directions, DC) prediction, specification has 4 kinds of different predictive modes for the luminance macroblock of (16 pixels * 16 pixels), be specially vertical, level, DC and plane prediction mode, can utilize the pixel around the current sub-piece/piece/macro block that is encoded to predict as the reference pixel.
Video encoding standard/advanced video coding standard H.264 (Video Coding H.264/Advanced, H.264/AVC) in, infra-frame prediction uses that the adjacent lines and the adjacent column pixel of decoding block are carried out infra-frame prediction.From these pixels, can select different directions intra prediction mode or DC predictive mode.H.264/AVC comprised based on specification and be 9 kinds of intra prediction modes of the piece/sub-piece of (4 pixels * 4 pixels) or (8 pixels * 8 pixels) and specification 4 kinds of intra prediction modes for the macro block of (16 pixels * 16 pixels).
Fig. 1 left-hand component shows sub-piece and the reference pixel A-M thereof of a specification for (4 pixels * 4 pixels), Fig. 2 right-hand component shows 8 predictive mode directions to the different directions intra prediction mode of a-p pixel in this sub-piece, and Fig. 2 shows 9 kinds of predictive modes of intra prediction mode: vertical (Vertical) predictive mode, level (Horizontal) predictive mode, the DC predictive mode, bottom left diagonal (Diagonal Down-left) predictive mode, bottom right diagonal (Diagonal Down-right) predictive mode, right vertical (Vertical-right) predictive mode, following level (Horizontal-down) predictive mode, vertical (Vertical-left) predictive mode in a left side, last level (Horizontal-up) predictive mode.
Because the prediction (pattern equals 2 among Fig. 2) of DC is to utilize the mean value of reference pixel A, B, C, D and I, J, K, L to come the pixel value of current block is predicted in the prior art, just simply the reference pixel (I, J, K, L) of the reference pixel (A, B, C, D) on the described current block left side and top is averaged and obtain pixel predictors, the continuation property that this texture that has destroyed current block distributes has reduced prediction accuracy.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of method of intra-prediction and infra-frame prediction device are provided, and can solve the continuation property of the texture distribution that keeps current block when carrying out the current block pixel value prediction, guarantees prediction accuracy.
In order to solve the problems of the technologies described above, the embodiment of the invention has proposed a kind of method of intra-prediction, comprising:
Get the interior current block of frame and carry out pixel value prediction;
According to the predictive mode direction of the adjacent block of described current block and/or the reference pixel value in the described adjacent block, determine the pixel predictors of the described current block under the described current block grain direction.
Correspondingly, the embodiment of the invention also provides a kind of infra-frame prediction device, comprising:
Acquiring unit is got a current block in the frame that carries out pixel value prediction;
Predicting unit according to the predictive mode direction of the adjacent block of described current block and/or the reference pixel value in the described adjacent block, is determined the pixel predictors of the described current block under the described current block grain direction.
A current block carries out pixel value prediction to the embodiment of the invention in the frame by getting, according to the predictive mode direction of the adjacent block of described current block and/or the reference pixel value in the described adjacent block, determine the pixel predictors of the described current block under the described current block grain direction, thereby the continuation property that the texture that keeps current block when carrying out the current block pixel value prediction distributes guarantees prediction accuracy.
Description of drawings
Fig. 1 is sub-piece and 8 predictive mode direction schematic diagrames of prior art;
Fig. 2 is 9 kinds of predictive mode schematic diagrames of the intra prediction mode of prior art;
Fig. 3 is the method for intra-prediction schematic diagram of the embodiment of the invention;
Fig. 4 is that the position that current sub-block is adjacent sub-piece in the embodiment of the invention concerns schematic diagram;
Fig. 5 is 4 kinds of distribution situation schematic diagrames of the affiliated macro block of current sub-block in the embodiment of the invention;
Fig. 6 is the schematic diagram of the affiliated macro block C of current sub-block in the embodiment of the invention;
Fig. 7 is the structural representation of the infra-frame prediction device of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method of intra-prediction and a kind of infra-frame prediction device, can keep the continuation property of the texture distribution of current block when carrying out the current block pixel value prediction, guarantees prediction accuracy.
Below in conjunction with accompanying drawing, the embodiment of the invention is elaborated.
Fig. 3 is the method for intra-prediction schematic diagram of the embodiment of the invention, and hypothesis position dark (bitdepth) is 8 in this method, then gets a fixed value
Be 128, other values can specifically adopt according to actual conditions, are not limited only to this, and with reference to this Fig. 3, this method mainly comprises:
301, obtain the interior current sub-block (Current Subblock) of frame and carry out pixel value prediction, wherein adjacent adjacent sub-blocks position relation as shown in Figure 4 with current sub-block, wherein adjacent sub-blocks can include the left piece (left) adjacent with described current block, last piece (up), the combination of one or more in upper right (up_right) and upper left (up_left), and A, B, C, D, E, F, G, H, I, J, K, L, X is the adjacent block reference image vegetarian refreshments (have corresponding reference pixel value) adjacent with current sub-block, describe for convenient, each reference image vegetarian refreshments corresponding reference pixel value is also used A, B, C, D, E, F, G, H, I, J, K, L, X represents, the also corresponding left that uses of the intra prediction mode of each adjacent sub-blocks, up, up_right, up_left represents, S0 cited below is A, B, C, the mean value of D, S1 is E, F, G, the mean value of H, S2 is I, J, K, the mean value of L, S3 are X;
302, in conjunction with the distribution situation of described current sub-block in frame, when described left piece, go up one or more combination in the piece, upper right and upper left when existing, according to reference pixel value adjacent in described each adjacent sub-blocks with described current sub-block, obtain the reconstructed pixel value of described each adjacent sub-blocks, specifically can be with reference to following flow process:
In conjunction with the 4 kind distribution situations of macro block in frame under the described current sub-block as shown in Figure 5, wherein C represents the affiliated macro block of current sub-block, A represents that encoded adjacent macroblocks, L of C top represent the C left side adjacent macroblocks of having encoded, and the current sub-block that we mentioned can be as shown in Figure 6 current sub-block under shown in 0 position of macro block C, macro block C adopts the specification of (16 pixels * 16 pixels), and current sub-block adopts the specification of (4 pixels * 4 pixels);
First kind of distribution situation, the distribution of (a) among macro block C such as Fig. 5, macro block C be positioned at frame the upper left corner first, according to above-mentioned definition to the adjacent sub-blocks of current sub-block among the macro block C, under this distribution situation, do not have relevant reference pixel around the current sub-block, therefore can determine that the pixel predictors of current sub-block is 128, at this moment:
When the left piece of adjacent sub-blocks, when going up piece, upper right and upper left and all not existing, the pixel predictors of determining described current block is a fixed value 128, and this situation can have following expression mode:
S0=128, S1=128, S2=128, S3=128, and intra prediction mode value ipmode_x=-1, x=left, up, up_right, up_left, the ipmode_x value for-1 expression do not have corresponding left piece, go up piece, upper right, upper left, and in 10 integers between the ipmode_x desirable under different situations-1 to 8 any, wherein ipmode_x gets the 9 kinds of intra prediction modes of value representation in 9 integers between 0 to 8;
Second kind of distribution situation, the distribution of (b) among macro block such as Fig. 5, macro block C is positioned at first row of frame, according to above-mentioned definition to the adjacent sub-blocks of current sub-block among the macro block C, under this distribution situation, 4 the reference image vegetarian refreshments (I, J, K, L) that have the left side around the current sub-block (situation of sub-piece 0,1,4,5 as shown in Figure 6), at this moment:
When the left piece of adjacent sub-blocks exists, and when going up piece, upper right, upper left and not existing, following expression mode is arranged:
S0=mean (I, J, K, L), S1=128, S2=mean (S0, S1), S3=128; Ipmode_left=M0, ipmode_up=-1, ipmode_up_right=-1, ipmode_up_left=-1, wherein mean represents to average, S0=mean (I, J, K for example, L) expression S0 is I, J, K, the mean value of L, M0 represents that when the left piece of adjacent sub-blocks existed, the intra prediction mode value of left piece was M0, and the value of the S2 does not here exist and the value of artificial setting/calculating owing to upper right, be S2=mean (S0, S1) be that rule of thumb value S2 is the mean value of S0 and S1, certainly, S2 also can choose the appropriate value in 0 to 255 pixel coverage in actual conditions;
The third distribution situation, the distribution of (c) among macro block such as Fig. 5, macro block C is positioned at first row of frame, according to above-mentioned definition to the adjacent sub-blocks of current sub-block among the macro block C, under this distribution situation, have around the current sub-block (situation of sub-piece 0,2,8,10 as shown in Figure 6) top and upper right side to 8 reference image vegetarian refreshments (A, B, C, D, E, F, G, H), at this moment:
When the last piece of adjacent sub-blocks, upper right existence, and left piece, upper left have following expression mode when not existing:
S0=128, and S1=mean (A, B, C, D), S2=mean (E, F, G, H), S3=128; Ipmode_up=M1, ipmode_up_right=M2, ipmode_left=-1, ipmode_up_left=-1, wherein M1 represents that when the last piece of adjacent sub-blocks existed, the intra prediction mode value of last piece was M1; When M2 represented that upper right when adjacent sub-blocks exists, upper right intra prediction mode value was M2;
The 4th kind of distribution situation, the distribution of (d) among macro block such as Fig. 5, macro block C is in the middle part of frame, according to above-mentioned definition to the adjacent sub-blocks of current sub-block among the macro block C, under this distribution situation, has complete reference phase vegetarian refreshments around the current sub-block, at this moment:
When the left piece of adjacent sub-blocks, when going up piece, upper right, upper left and all existing, following expression mode is arranged:
S0=mean (I, J, K, L), S1=mean (A, B, C, D), S2=mean (E, F, G, H), S3=X; Ipmode_left=M0, ipmode_up=M1, ipmode_up_right=M2, ipmode_up_left=M3, wherein upper left intra prediction mode value is M3;
In addition, the 5th kind of distribution situation is in last row of frame for macro block C, according to above-mentioned definition to the adjacent sub-blocks of current sub-block among the macro block C, under this distribution situation, current sub-block has only upper right not exist, and then E=mean (A can rule of thumb artificially be set/be calculated as to the value of E, F, G, H respectively at this moment, I), and F=mean (B, J), G=mean (C, K), and H=mean (D, L), and upper right intra prediction mode value can be set at M3, at this moment:
When the left piece of adjacent sub-blocks, when going up piece, upper right, upper left and all having (wherein upper right block message for artificial set), following expression mode is arranged:
S0=mean (I, J, K, L), S1=mean (A, B, C, D), S2=mean (E, F, G, H), S3=X; Ipmode_left=M0, ipmode_up=M1, ipmode_up_right=M2, ipmode_up_left=M3, wherein by the value of E, F, G, H as can be known the value of S2 be exactly the mean value of S0 and S1 in fact;
The 5th kind of distribution situation can be summed up in above-mentioned the 4th kind of distribution situation.
What deserves to be explained is, above-mentioned according to reference pixel value adjacent in described each adjacent sub-blocks with described current sub-block, obtain the reconstructed pixel value of described each adjacent sub-blocks, can be to get the reconstructed pixel value of a wherein corresponding reference pixel value, not necessarily ask reference pixel average (obtaining) by the mean step as each adjacent sub-blocks;
303, go out the grain direction of described current sub-block according to the predictive mode direction determining of described each adjacent sub-blocks, and according to the further grain direction of judging described current sub-block of the relation between the reconstructed pixel value of described each adjacent sub-blocks, specifically can following flow process be arranged in conjunction with 4 kinds of distribution situations of macro block under the described current sub-block as shown in Figure 5:
At above-mentioned first kind of distribution situation, owing to do not have relevant reference pixel around the current sub-block, so the pixel predictors of current sub-block is 128;
At above-mentioned second kind of distribution situation, owing to only there is the left piece of adjacent sub-blocks to exist, this moment can be with the reconstructed pixel value of the predictive mode direction (ipmode) of left piece and each adjacent sub-blocks as reference information, according to different predictive mode direction and S0, S1, relation between the S2 is judged the grain direction of current sub-block, can determine the grain direction roughly of current sub-block according to the intra prediction mode value M0 of left piece, again according to S0, size between the S1 or according to S0 and S1 absolute difference and preset the relation of threshold value determines a grain direction more accurately from described grain direction roughly;
At above-mentioned the third distribution situation, because the last piece of adjacent sub-blocks and upper right existence are arranged, can will go up piece this moment, the upper right predictive mode direction (ipmode) and the reconstructed pixel value of each adjacent sub-blocks are as reference information, according to different predictive mode direction and S0, S1, relation between the S2 is judged the grain direction of current sub-block, according to last piece, upper right intra prediction mode value M1, M2 determines the grain direction roughly of current sub-block, again according to S1, size between the S2 or according to S1 and S2 absolute difference and preset the relation of threshold value determines a grain direction more accurately from described grain direction roughly;
At above-mentioned the 4th kind of distribution situation (comprising the 5th kind of distribution situation), because the left piece of adjacent sub-blocks is arranged, last piece, upper right, upper left existence, this moment can be with left piece, last piece, upper right, the upper left predictive mode direction (ipmode) and the reconstructed pixel value of each adjacent sub-blocks are as reference information, according to different predictive mode direction and S0, S1, S2, relation between the S3 is judged the grain direction of current sub-block, according to left piece, last piece, upper right, upper left intra prediction mode value M0, M1, M2, M3 determines the grain direction roughly of current sub-block, again according to S0 and S1, S0 and S2, S0 and S3, S1 and S2, the magnitude relationship of S1 and S3 or S2 and S3, or according to S0 and S1, S0 and S2, S0 and S3, S1 and S2, absolute difference and the relation that presets threshold value determine a grain direction more accurately between S1 and S3 or S2 and the S3 from described grain direction roughly;
In addition, correlation according to described adjacent sub-blocks and current sub-block, can consider following rule in the selection of grain direction: the predictive mode direction with left piece is an optimum, secondly be last piece predictive mode direction, the 3rd is upper right predictive mode direction, is upper left predictive mode direction at last;
304, grain direction according to described further judgement, determine the pixel predictors of described current sub-block by the reconstructed pixel value of described each adjacent sub-blocks, promptly the texture according to prediction distributes, make the pixel predictors of current sub-block equal or the average of its combination in the reconstructed pixel value of described each adjacent sub-blocks, in conjunction with top 303 described contents, following example is specifically arranged, so that the pixel predictors of current sub-block equals in the reconstructed pixel value of described each adjacent sub-blocks one for example but be not limited only to this:
At above-mentioned second kind of distribution situation and consider corresponding content in 303, owing to only have the left piece of adjacent sub-blocks to exist, when M0 is a horizontal direction, and S0 is less than S1, or absolute difference abs (s0, s1) less than a certain preset threshold, then the pixel predictors of described current sub-block is S0;
At above-mentioned the third distribution situation and consider corresponding content in 303, because the last piece of adjacent sub-blocks and upper right existence are arranged, when M1 equals the bottom left diagonal, M2 equals horizontal direction, abs (S1, S2) greater than a certain preset threshold, then the pixel predictors of described current sub-block is S2;
At above-mentioned the 4th kind of distribution situation (comprising the 5th kind of distribution situation) and consider corresponding content in 303, since have adjacent sub-blocks left piece, go up piece, upper right, upper left existence, when M0, M1, M2, M3 are the DC predicted value, abs (S0, S3) less than a certain preset threshold and abs (S1, S2) less than this threshold value, then the pixel predictors of described current sub-block is S3.
By implementing the method for intra-prediction of the embodiment of the invention as shown in Figure 3, carry out pixel value prediction to obtaining in the frame current sub-block, when described left piece, last piece, when the combination of one or more in upper right and upper left exists, according to reference pixel value adjacent in described each adjacent block with described current block, obtain the reconstructed pixel value of described each adjacent block, and go out the grain direction of described current sub-block according to the predictive mode direction determining of described each adjacent sub-blocks, and according to the further grain direction of judging described current sub-block of the relation between the reconstructed pixel value of described each adjacent sub-blocks, at last, grain direction according to described further judgement, determine the pixel predictors of described current sub-block by the reconstructed pixel value of described each adjacent sub-blocks, thereby can make full use of the reference pixel around the current sub-block and the prediction mode information of adjacent sub-blocks, kept the texture distribution of current sub-block, under the condition that does not increase complexity, improve the accuracy of current sub-block pixel prediction, improved code efficiency effectively.
As a kind of execution mode, when not having the predictive mode direction of described adjacent block, when for example the predictive mode of described adjacent block is interframe block for DC predictive mode or described adjacent block entirely, above-mentioned 303,304 replaceable be following steps:
Judge the grain direction of described current block according to the relation between the reconstructed pixel value of described each adjacent block;
Grain direction according to described judgement, determine the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block, particularly, determine that by the reconstructed pixel value of described each adjacent block the pixel predictors of described current block can be to make the pixel predictors of current sub-block equal or the average of its combination in the reconstructed pixel value of described each adjacent sub-blocks.
As a kind of execution mode, when coding side obtains the real pixel value of current sub-block (and pixel value of nonanticipating), select pixel value in the average of can be in the reconstructed pixel value of a plurality of adjacent sub-blocks that obtain by said method or its combination with the immediate prediction of described real pixel value, then need increase corresponding sign at coding side this moment, for example DC_sel_Idx identifies, shown in the following macroblock prediction pixel value conversion grammar correction signal table 1:
| mb_pred(mb_type){ | C | Descriptor |
| if(MbPartPredMode(mb_type，0)＝＝Intra_4 x 4││ MbPartPredMode(mb_type，0)＝＝Intra_8 x 8││ MbPartPredMode(mb_type，0)＝＝Intra_16 x 16){ | ||
| if(MbPartPredMode(mb_type，0)＝＝Intra_4 x 4) | ||
| for(luma4 x 4BlkIdx＝0；luma4 x 4BlkIdx<16；luma4 x 4BlkIdx++){ | ||
| prev_intra4 x 4_pred_mode_flag[luma4 x 4BlkIdx] | 2 | u(1)|ae(v) |
| if(!prev_intra4 x 4_pred_mode_flag[luma4 x 4BlkIdx]){ | ||
| rem_intra4 x 4_pred_mode[luma4 x 4BlkIdx] | 2 | u(3)|ae(v) |
| if(rem_intra4 x 4_pred_mode[luma4 x 4BlkIdx]＝＝DC) | ||
| DC_sel_Idx | 2 | u(n)|ae(v) |
| } | ||
| } | ||
| if(MbPartPredMode(mb_type，0)＝＝Intra_8 x 8) | ||
| for(luma8 x 8BlkIdx＝0；luma8 x 8BlkIdx<4；luma8 x 8BlkIdx++){ | ||
| prev_intra8 x 8_pred_mode_flag[luma8 x 8BlkIdx] | 2 | u(1)|ae(v) |
| if(!prev_intra8 x 8_pred_mode_flag[luma8 x 8BlkIdx]) | ||
| rem_intra8 x 8_pred_mode[luma8 x 8BlkIdx] | 2 | u(3)|ae(v) |
| if(rem_intra4 x 4_pred_mode[luma8 x 8BlkIdx]＝＝DC) | ||
| DC_sel_Idx | 2 | u(n)|ae(v) |
| } | ||
| } | ||
| if(chroma_format_idc!＝0) | ||
| intra_chroma_pred_mode | 2 | ue(v)|ae(v) |
| } | ||
| ……………… |
Table 1
If the pixel predictors of described current sub-block is the pixel predictors of left piece correspondence, then DC_sel_Idx=0; If the pixel predictors of described current sub-block is the pixel predictors of last piece correspondence, then DC_sel_Idx=1; If the pixel predictors of described current sub-block is the pixel predictors of upper right correspondence, then DC_sel_Idx=2; If the pixel predictors of described current sub-block is the pixel predictors of upper left correspondence, then DC_sel_Idx=3 or the like.
As a kind of execution mode, obtain the pixel predictors of current sub-block by said method when coding side, and when obtaining the real pixel value of current sub-block, can further obtain the pixel predictors of described current sub-block and the difference of described real pixel value, indicate and transmit by corresponding identification in the code table, transmit the pixel predictors of described current sub-block simultaneously, decoding end is then reducible by the described difference that receives and pixel predictors to be described real pixel value.
Fig. 7 is the structural representation of the infra-frame prediction device of the embodiment of the invention, with reference to this figure, this device mainly comprises acquiring unit 71, predicting unit 72, wherein predicting unit 72 comprises that pixel predictors obtains unit 721, grain direction identifying unit 722, determining unit 723, described determining unit 723 also comprises first determining unit 7231, second determining unit 7232, wherein each Elementary Function such as following:
Acquiring unit 71 obtains the interior current block of frame and carries out pixel value prediction;
Pixel predictors obtains unit 721, in conjunction with the distribution situation of described current block in frame, when the adjacent block adjacent: left piece, go up one or more combination in the piece, upper right and upper left when existing with current block, according to reference pixel value adjacent in described each adjacent block with described current block, obtain the reconstructed pixel value of described each adjacent block, wherein the position of adjacent block and current block relation can be with reference to shown in Figure 4, the processing of described various distribution situations is mentioned in above-mentioned corresponding content, is repeated no more herein;
Grain direction identifying unit 722, go out the grain direction of described current block according to the predictive mode direction determining of described each adjacent block, and according to the further grain direction of judging described current block of the relation between the reconstructed pixel value of described each adjacent block, particularly, can go out the grain direction roughly of current sub-block earlier according to the predictive mode direction determining of described each adjacent block, again according to the relation between the reconstructed pixel value of described each adjacent block, from described grain direction roughly, determine a grain direction more accurately, wherein, pass between the reconstructed pixel value of described each adjacent block be the wherein pixel predictors of at least one pair of adjacent block correspondence absolute difference with preset the relation of threshold value, or the magnitude relationship of the pixel predictors of at least one pair of adjacent block correspondence wherein;
First determining unit 7231 according to the grain direction of described further judgement, is determined the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block;
Second determining unit 7232, when described left piece, when going up piece, upper right and upper left and all not existing, the pixel predictors of determining described current block is a fixed value, and this fixed value can be an empirical value 128 of the prior art, and this second determining unit 7232 can be selected to adopt according to actual conditions.
As a kind of execution mode, when not having the predictive mode direction of described adjacent block, when for example the predictive mode of described adjacent block is the sub-piece/piece of interframe/macro block for DC predictive mode or described adjacent block entirely, described grain direction identifying unit 722 also is used for judging according to the relation between the reconstructed pixel value of described each adjacent block the grain direction of described current block, described determining unit 723 also is used for the grain direction according to described judgement, is determined the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block.
The following points that need explanation:
1, the setting of the reference image vegetarian refreshments of described adjacent block can be selected according to actual conditions, is not limited to adopt pixel adjacent with current block in the adjacent block;
2, described current block can be the specification of (4 pixels * 4 pixels), (8 pixels * 8 pixels) or (16 pixels * 16 pixels).
In addition, 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 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 (Radom Access Memory, RAM) etc.
The above is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (14)
1, a kind of method of intra-prediction is characterized in that, comprising:
Get the interior current block of frame and carry out pixel value prediction;
According to the predictive mode direction of the adjacent block of described current block and/or the reference pixel value in the described adjacent block, determine the pixel predictors of the described current block under the described current block grain direction.
2, method of intra-prediction as claimed in claim 1, it is characterized in that, described adjacent block comprises the left piece adjacent with described current block, goes up piece, one or more the combination in upper right and upper left, the predictive mode direction of then described adjacent block according to described current block and/or the reference pixel value in the described adjacent block, determine that the pixel predictors of the described current block under the described current block grain direction is specially:
When described left piece, go up one or more combination in the piece, upper right and upper left when existing, according to reference pixel value adjacent in described each adjacent block, obtain the reconstructed pixel value of described each adjacent block with described current block;
Go out the grain direction of described current block according to the predictive mode direction determining of described each adjacent block, and further judge the grain direction of described current block according to the relation between the reconstructed pixel value of described each adjacent block;
According to the grain direction of described further judgement, determine the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block.
3, method of intra-prediction as claimed in claim 1, it is characterized in that, described adjacent block comprises the left piece adjacent with described current block, goes up piece, one or more the combination in upper right and upper left, when not having the predictive mode direction of described adjacent block, the predictive mode direction of described adjacent block according to described current block and/or the reference pixel value in the described adjacent block, determine that the pixel predictors of the described current block under the described current block grain direction is specially:
When described left piece, go up one or more combination in the piece, upper right and upper left when existing, according to reference pixel value adjacent in described each adjacent block, obtain the reconstructed pixel value of described each adjacent block with described current block;
Judge the grain direction of described current block according to the relation between the reconstructed pixel value of described each adjacent block;
According to the grain direction of described judgement, determine the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block.
4, as claim 2 or 3 described method of intra-prediction, it is characterized in that this method also comprises:
When described left piece, when going up piece, upper right and upper left and all not existing, the pixel predictors of determining described current block is a fixed value.
As claim 2 or 3 described method of intra-prediction, it is characterized in that 5, described according to reference pixel value adjacent with described current block in described each adjacent block, the reconstructed pixel value that obtains described each adjacent block is specially:
When described left piece exists, described when going up piece, upper right, upper left and not existing, calculate the mean value of reference pixel value adjacent in the described left piece, with the reconstructed pixel value of this mean value as described left piece with described current block; With the reconstructed pixel value of a fixed value as described last piece; With the reconstructed pixel value and the described mean value of going up the reconstructed pixel value of piece of described left piece, as described upper right reconstructed pixel value; With described fixed value as described upper left reconstructed pixel value;
Go up piece, upper right existence when described, described left piece, when the lower-left piece does not exist, with the reconstructed pixel value of described fixed value as described left piece; Calculate the mean value of reference pixel value adjacent in the described last piece, with the reconstructed pixel value of this mean value as described last piece with described current block; Calculate the mean value of reference pixel value adjacent in described upper right, with the reconstructed pixel value of this mean value as described upper right correspondence with described current block; With described fixed value as described upper left reconstructed pixel value;
When described left piece, when going up piece, upper right and upper left and all existing, calculate the mean value of reference pixel value adjacent in the described left piece, with the reconstructed pixel value of this mean value as described left piece with described current block; Calculate the mean value of reference pixel value adjacent in the described last piece, with the reconstructed pixel value of this mean value as described last piece with described current block; Calculate the mean value of reference pixel value adjacent in described upper right with described current block, with this mean value as described upper right reconstructed pixel value; With a reference pixel value adjacent in described upper left, as described upper left reconstructed pixel value with described current block;
When described left piece, go up piece, upper left existence, described upper right when not existing, calculate the mean value of reference pixel value adjacent in the described left piece, with the reconstructed pixel value of this mean value as described left piece with described current block; Calculate the mean value of reference pixel value adjacent in the described last piece, with the reconstructed pixel value of this mean value as described last piece with described current block; With the reconstructed pixel value and the described mean value of going up the reconstructed pixel value of piece of described left piece, as described upper right reconstructed pixel value; With a reference pixel value adjacent in described upper left, as described upper left reconstructed pixel value with described current block.
6, method of intra-prediction as claimed in claim 2 is characterized in that, described grain direction according to the described current block of the further judgement of the relation between the reconstructed pixel value of described each adjacent block is specially:
Go out at predictive mode direction determining on the basis of grain direction of described current block according to described each adjacent block, further judge the grain direction of described current block according to the absolute difference of the reconstructed pixel value of described at least one pair of adjacent block and the relation that presets threshold value, or
Go out at predictive mode direction determining on the basis of grain direction of described current block, further judge the grain direction of described current block according to the magnitude relationship of the reconstructed pixel value of described at least one pair of adjacent block according to described each adjacent block.
7, method of intra-prediction as claimed in claim 4 is characterized in that, described fixed value is
, wherein bitdepth represents that the position is dark.
As the described method of intra-prediction of claim 1 to 3, it is characterized in that 8, described current block is the specification of (4 pixels * 4 pixels), (8 pixels * 8 pixels) or (16 pixels * 16 pixels).
9, a kind of infra-frame prediction device is characterized in that, comprising:
Acquiring unit is got a current block in the frame that carries out pixel value prediction;
Predicting unit according to the predictive mode direction of the adjacent block of described current block and/or the reference pixel value in the described adjacent block, is determined the pixel predictors of the described current block under the described current block grain direction.
10, infra-frame prediction device as claimed in claim 9 is characterized in that, described adjacent block comprises the left piece adjacent with described current block, goes up piece, one or more the combination in upper right and upper left, and then described predicting unit comprises:
First pixel predictors obtains the unit, when described left piece, go up one or more combination in the piece, upper right and upper left when existing, according to reference pixel value adjacent with described current block in described each adjacent block, obtains the reconstructed pixel value of described each adjacent block;
The first grain direction identifying unit goes out the grain direction of described current block according to the predictive mode direction determining of described each adjacent block, and further judges the grain direction of described current block according to the relation between the reconstructed pixel value of described each adjacent block;
First determining unit according to the grain direction of described further judgement, is determined the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block.
11, infra-frame prediction device as claimed in claim 9, it is characterized in that, described adjacent block comprises the left piece adjacent with described current block, goes up piece, one or more the combination in upper right and upper left, and when not having the predictive mode direction of described adjacent block, described predicting unit comprises:
Second pixel predictors obtains the unit, when described left piece, go up one or more combination in the piece, upper right and upper left when existing, according to reference pixel value adjacent with described current block in described each adjacent block, obtains the reconstructed pixel value of described each adjacent block;
The second grain direction identifying unit is judged the grain direction of described current block according to the relation between the reconstructed pixel value of described each adjacent block;
Second determining unit according to the grain direction of described judgement, is determined the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block.
12, as claim 10 or 11 described infra-frame prediction devices, it is characterized in that described determining unit comprises:
First determining unit according to the grain direction of described further judgement, is determined the pixel predictors of described current block by the reconstructed pixel value of described each adjacent block;
Second determining unit, when described left piece, when going up piece, upper right and upper left and all not existing, the pixel predictors of determining described current block is a fixed value.
13, infra-frame prediction device as claimed in claim 12 is characterized in that, described fixed value is
, wherein bitdepth represents that the position is dark.
As each described infra-frame prediction device in the claim 9 to 11, it is characterized in that 14, described current block is the specification of (4 pixels * 4 pixels), (8 pixels * 8 pixels) or (16 pixels * 16 pixels).
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