CN102843555A - Intra-frame prediction method and system - Google Patents
Intra-frame prediction method and system Download PDFInfo
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- CN102843555A CN102843555A CN2011101741801A CN201110174180A CN102843555A CN 102843555 A CN102843555 A CN 102843555A CN 2011101741801 A CN2011101741801 A CN 2011101741801A CN 201110174180 A CN201110174180 A CN 201110174180A CN 102843555 A CN102843555 A CN 102843555A
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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
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
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- 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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- H04N19/169—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
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Abstract
The invention discloses an intra-frame prediction method and an intra-frame prediction system. The method comprises the following steps: dividing pixels of a current block into the pixels to be encoded preferentially and the pixels to be predicted to perform bidirectional prediction to obtain a bidirectional predicted value; furthermore, performing a unidirectional prediction on the current block to obtain a unidirectional predicted value; and performing weighted summation on the bidirectional predicted value and the unidirectional predicted value to obtain the final predicted value of the current block. The intra-frame prediction technology of the invention can well combine texture information of a video image, improves the intra-frame prediction precision of the video image and reduces the residual by utilizing the characteristics of the video image, so as to improve the efficiency of video coding compression.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of intra-frame prediction method and system.
Background technology
All comprised the infra-frame prediction function in the present advanced video coding standard, utilized the pixel of adjacent blocks to predict current block,, so only need encode the residual error of predict blocks and current block with the spatial redundancy in the better elimination single-frame images.When macro block is when adopting the frame mode coding, to utilize the also block structure predict blocks of reconstruct of before having encoded.For luminance component, can be each piece or macro block establishment predict blocks.For example H.264 in the coding standard 4 * 4 luminance block have 9 kinds of alternative modes, 16 * 16 luminance block have 4 kinds of alternative modes.
In standard H.264, utilize the several or all points in 13 sample points (A～L and Q) of having decoded in the adjacent block, predict sample point (a～p) (as shown in Figure 1) in current 4 * 4 luminance block.Select best a kind of of effect in 9 kinds of predictive modes, as the optimum prediction mode of this piece.Said 9 kinds of predictive modes comprise: DC prediction and 8 kinds of single directional prediction (as shown in Figure 2) of pattern 2.These single directional prediction patterns can be predicted directive texture structure well.
In the prediction employed all reference sample points all come own to the zone (top or left, as shown in Figure 3) of encode, and the below perhaps right-hand as yet not the sample point in the coding region do not participate in predicting.Above-mentioned single directional prediction mode causes the sample point on the equidirectional to be composed with identical predicted value; Yet in frame of video, a sample point all is different with the brightness value of consecutive points usually, and this will have a strong impact on the infra-frame prediction precision of video image.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of intra-frame prediction method and system, to improve the infra-frame prediction precision of video image.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of intra-frame prediction method, this method comprises:
The pixel of current block is divided into priority encoding pixel and predict pixel, carries out bi-directional predicted in view of the above to obtain bi-directional predicted value; And, current block is carried out single directional prediction to obtain the single directional prediction value;
With said bi-directional predicted value and the weighted sum of single directional prediction value, obtain the final predicted value of current block.
Saidly carry out bi-directional predicted process and comprise:
Said priority encoding pixel is carried out predictive coding, and obtain its reconstructed value; In conjunction with the reconstructed value of said priority encoding pixel and the neighbor reconstructed value of current block, the predict pixel in the current block is predicted, obtain the bi-directional predicted value of current block.
This method also comprises:
Said predict pixel is divided into forward prediction pixel and bi-directional predicted pixel;
Wherein, said forward prediction pixel only uses neighbor to rebuild to carry out single directional prediction, and said bi-directional predicted pixel uses forward prediction pixel predictors and priority encoding pixel to rebuild bi-directional predicted to carry out.
With said bi-directional predicted value and the weighted sum of single directional prediction value, the process that obtains the final predicted value of current block comprises:
With said bi-directional predicted value and single directional prediction value,, obtain the best weight coefficient of predicted value, and obtain its corresponding current block predicted value, as the final predicted value of current block by different weight weighting summations.
This method also comprises:
Calculate the residual error of current block original pixel value and said final predicted value, then coding;
After this, the next piece that begins to encode is till the piece in the present encoding unit all disposes.
This method also comprises:
In decoding end, the piece in the coding unit is carried out bi-directional predicted and/or single directional prediction, obtain corresponding bi-directional predicted value and/or single directional prediction value, the final predicted value of calculating current block in view of the above is to obtain the reconstructed value of current block.
In decoding end, when the piece in the coding unit being carried out bi-directional predicted and single directional prediction, the final predicted value of said calculating current block comprises with the process of the reconstructed value that obtains current block:
With bi-directional predicted value that obtains and single directional prediction value, press the weight coefficient weighting summation, obtain the final predicted value of current block; With prediction residual and the said final predicted value addition that decoding obtains, obtain the reconstructed value of current block.
A kind of infra-frame prediction system, this system comprises final predicting unit and coupled bi-directional predicted unit, single directional prediction unit; Wherein,
Said bi-directional predicted unit is used for the pixel of current block is divided into priority encoding pixel and predict pixel, carries out bi-directional predicted to obtain bi-directional predicted value in view of the above;
Said single directional prediction unit is used for current block is carried out single directional prediction to obtain the single directional prediction value;
Said final predicting unit is used for said bi-directional predicted value and the weighted sum of single directional prediction value are obtained the final predicted value of current block.
Said bi-directional predicted unit carries out being used for when bi-directional predicted:
Said priority encoding pixel is carried out predictive coding, and obtain its reconstructed value; In conjunction with the reconstructed value of said priority encoding pixel and the neighbor reconstructed value of current block, the predict pixel in the current block is predicted, obtain the bi-directional predicted value of current block.
Said bi-directional predicted unit also is used for:
Said predict pixel is divided into forward prediction pixel and bi-directional predicted pixel;
Wherein, said forward prediction pixel only uses neighbor to rebuild to carry out single directional prediction, and said bi-directional predicted pixel uses forward prediction pixel predictors and priority encoding pixel to rebuild bi-directional predicted to carry out.
Said final predicting unit is said bi-directional predicted value and the weighted sum of single directional prediction value, when obtaining the final predicted value of current block, is used for:
With said bi-directional predicted value and single directional prediction value,, obtain the best weight coefficient of predicted value, and obtain its corresponding current block predicted value, as the final predicted value of current block by different weight weighting summations.
Said final predicting unit also is used for:
Calculate the residual error of current block original pixel value and said final predicted value, then coding;
After this, trigger the next piece of said bi-directional predicted unit and single directional prediction cell encoding, till the piece in the present encoding unit all disposes.
Said bi-directional predicted unit and/or single directional prediction unit also are used for: in decoding end the piece of coding unit is carried out corresponding bi-directional predicted and/or single directional prediction, obtain corresponding bi-directional predicted value and/or single directional prediction value;
Said final predicting unit also is used for: in decoding end, the final predicted value of calculating current block according to said bi-directional predicted value and/or single directional prediction value is to obtain the reconstructed value of current block.
In decoding end, when the piece in the coding unit being carried out bi-directional predicted and single directional prediction, the final predicted value that said final predicting unit is calculated current block is used for when obtaining the reconstructed value of current block:
With bi-directional predicted value that obtains and single directional prediction value, press the weight coefficient weighting summation, obtain the final predicted value of current block; With prediction residual and the said final predicted value addition that decoding obtains, obtain the reconstructed value of current block.
Infra-prediction techniques of the present invention has been utilized the characteristics of video image, and the texture information of combining image well improves the infra-frame prediction precision of video image, reduces residual error, thereby improves the efficient of video coding compression.
Description of drawings
Fig. 1 is 4 * 4 forecast sample point sketch mapes;
Fig. 2 is 8 kinds of prediction direction sketch mapes of 4 * 4 predictions;
Fig. 3 is the sketch map that concerns of adjacent block A, B, C;
Fig. 4 is the infra-frame prediction flow chart of one embodiment of the invention;
Fig. 5 is current block prediction sketch map a;
Fig. 6 is current block prediction sketch map b;
Fig. 7 is the infra-frame prediction flow chart of another embodiment of the present invention;
Fig. 8 is the infra-frame prediction general flow chart of the embodiment of the invention;
Fig. 9 is the infra-frame prediction system diagram of the embodiment of the invention.
Embodiment
In practical application, because that sample point is adjacent around the intermediate value of sample point is very approaching, the result of therefore bi-directional predicted (forward direction with back to) is better than single directional prediction usually.Based on this situation, can carry out flow process as shown in Figure 4, this flow process may further comprise the steps:
The first step: press the piece stripe sequence of coding unit, successively the piece in the present encoding unit is encoded;
Second step: the pixel of current block is divided into two types: one type is the priority encoding pixel, is designated as D; Another kind of is predict pixel, is designated as P;
The 3rd step: D carries out predictive coding to the priority encoding pixel, and obtains its reconstructed value;
Particularly, said predictive coding can adopt the neighbor reconstructed value of current block to predict (the for example average of neighbor), then prediction residual is encoded.
The 4th step: the reconstructed value of the priority encoding pixel D that obtains above the combination and the neighbor reconstructed value of current block, the predict pixel P in the current block is predicted, obtain the bi-directional predicted value Pb of current block, as shown in Figure 5;
Particularly, said predict pixel P can also continue to be divided into forward prediction pixel F and bi-directional predicted pixel B.Wherein, forward prediction pixel F only uses neighbor to rebuild to carry out single directional prediction, and bi-directional predicted pixel B then can use forward prediction pixel F predicted value and priority encoding pixel D to rebuild bi-directional predicted, as shown in Figure 6 to carry out.
The 5th step: utilize the neighbor reconstructed value of current block, current block is carried out single directional prediction, obtain the optimum prediction direction and corresponding single directional prediction value Pd of current block;
The 6th step: bi-directional predicted value Pb that will obtain and single directional prediction value Pd by different weight weighting summations, obtain the best weight coefficient W of predicted value, and obtain its corresponding current block predicted value, as the final predicted value Pf of current block;
Said weight coefficient W can adopt several bit to represent, such as 2bit, and 4bit, 8bit.
The 7th step: calculate the residual error of current block original pixel value and final predicted value Pf, then it is encoded.
After this, turn back to the first step beginning the next piece of encoding, till the piece in the present encoding unit all disposes.
Need to prove that above-mentioned flow process relates to the operation of carrying out at coding side, the texture information of combining image well improves the infra-frame prediction precision of video image, reduces residual error, thereby improves the efficient of video coding compression.
Operating corresponding decoding end with above-mentioned coding side, can carry out flow process as shown in Figure 7, this flow process may further comprise the steps:
The first step: press the piece stripe sequence of coding unit, successively the piece in the coding unit is decoded;
Second step: decoding obtains the infra-frame prediction weight coefficient W of current block, if weight coefficient W representes only to use single directional prediction, then directly gets into for the 7th step;
The 3rd step: the pixel of current block is divided into two types: one type is the priority encoding pixel, is designated as D; Another kind of is predict pixel, is designated as P;
The 4th step: D carries out prediction decoding to the priority encoding pixel, obtains its reconstructed value;
Need to prove that said prediction decoding must adopt the Forecasting Methodology identical with coding side, predict such as the average of the neighbor that adopts current block; Then the prediction residual in the code stream is decoded, addition obtains the reconstructed value of priority encoding pixel D.
The 5th step: the priority encoding pixel D reconstructed value that obtains above the combination and the neighbor reconstructed value of current block, the predict pixel P in the current block is predicted, obtain the predicted value Pb of current block;
Need to prove that predict pixel P can also continue to be divided into forward prediction pixel F and bi-directional predicted pixel B.Wherein, forward prediction pixel F only uses neighbor to rebuild to carry out single directional prediction, and bi-directional predicted pixel B then can use forward prediction pixel F predicted value and priority encoding pixel D to rebuild bi-directional predicted to carry out.
The 6th the step: if weight coefficient W represent without single directional prediction, then, directly got into for the 9th step with the final predicted value Pf of Pb as current block; Otherwise, got into for the 7th step.
The 7th step: decoding obtains the best single directional prediction pattern of current block, utilizes the neighbor reconstructed value of current block, and current block is carried out single directional prediction, obtains the single directional prediction value Pd of current block.If weight coefficient W representes only to use single directional prediction, then with Pd as final predicted value Pf, directly got into for the 9th step, otherwise got into for the 8th step;
The 8th step: bi-directional predicted value Pb that will obtain and single directional prediction value Pd, press weight coefficient W weighting summation, obtain the final predicted value Pf of current block;
The 9th step:, obtain the reconstructed value of current block with decoding prediction residual that obtains and the final predicted value Pf addition that calculates.
After this, turn back to the first step beginning the next piece of decoding, till the piece in the present encoding unit all disposes.
Can know that in conjunction with above technical description the operation thinking of infra-frame prediction of the present invention can be represented flow process as shown in Figure 8, this flow process may further comprise the steps:
Step 810: the pixel of current block is divided into priority encoding pixel and predict pixel, carries out bi-directional predicted in view of the above to obtain bi-directional predicted value; And, current block is carried out single directional prediction to obtain the single directional prediction value.
Step 820:, obtain the final predicted value of current block with said bi-directional predicted value and the weighted sum of single directional prediction value.
In order to guarantee that above-mentioned technical description and operation thinking can realize smoothly, can carry out setting as shown in Figure 9.Referring to Fig. 9, Fig. 9 is the infra-frame prediction system diagram of the embodiment of the invention, and this system comprises final predicting unit and coupled bi-directional predicted unit, single directional prediction unit.
In practical application, bi-directional predicted unit can be divided into the pixel of current block priority encoding pixel and predict pixel, carries out bi-directional predicted to obtain bi-directional predicted value in view of the above; The single directional prediction unit can carry out single directional prediction to obtain the single directional prediction value to current block.Final predicting unit then can obtain the final predicted value of current block with said bi-directional predicted value and the weighted sum of single directional prediction value.
Visible in sum, no matter be method or system, infra-prediction techniques of the present invention has been utilized the characteristics of video image; The texture information of combining image well; Improve the infra-frame prediction precision of video image, reduce residual error, thereby improve the efficient of video coding compression.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (14)
1. an intra-frame prediction method is characterized in that, this method comprises:
The pixel of current block is divided into priority encoding pixel and predict pixel, carries out bi-directional predicted in view of the above to obtain bi-directional predicted value; And, current block is carried out single directional prediction to obtain the single directional prediction value;
With said bi-directional predicted value and the weighted sum of single directional prediction value, obtain the final predicted value of current block.
2. method according to claim 1 is characterized in that, saidly carries out bi-directional predicted process and comprises:
Said priority encoding pixel is carried out predictive coding, and obtain its reconstructed value; In conjunction with the reconstructed value of said priority encoding pixel and the neighbor reconstructed value of current block, the predict pixel in the current block is predicted, obtain the bi-directional predicted value of current block.
3. method according to claim 2 is characterized in that, this method also comprises:
Said predict pixel is divided into forward prediction pixel and bi-directional predicted pixel;
Wherein, said forward prediction pixel only uses neighbor to rebuild to carry out single directional prediction, and said bi-directional predicted pixel uses forward prediction pixel predictors and priority encoding pixel to rebuild bi-directional predicted to carry out.
4. method according to claim 1 is characterized in that, with said bi-directional predicted value and the weighted sum of single directional prediction value, the process that obtains the final predicted value of current block comprises:
With said bi-directional predicted value and single directional prediction value,, obtain the best weight coefficient of predicted value, and obtain its corresponding current block predicted value, as the final predicted value of current block by different weight weighting summations.
5. according to each described method of claim 1 to 4, it is characterized in that this method also comprises:
Calculate the residual error of current block original pixel value and said final predicted value, then coding;
After this, the next piece that begins to encode is till the piece in the present encoding unit all disposes.
6. according to each described method of claim 1 to 4, it is characterized in that this method also comprises:
In decoding end, the piece in the coding unit is carried out bi-directional predicted and/or single directional prediction, obtain corresponding bi-directional predicted value and/or single directional prediction value, the final predicted value of calculating current block in view of the above is to obtain the reconstructed value of current block.
7. method according to claim 6 is characterized in that, in decoding end, when the piece in the coding unit being carried out bi-directional predicted and single directional prediction, the final predicted value of said calculating current block comprises with the process of the reconstructed value that obtains current block:
With bi-directional predicted value that obtains and single directional prediction value, press the weight coefficient weighting summation, obtain the final predicted value of current block; With prediction residual and the said final predicted value addition that decoding obtains, obtain the reconstructed value of current block.
8. an infra-frame prediction system is characterized in that, this system comprises final predicting unit and coupled bi-directional predicted unit, single directional prediction unit; Wherein,
Said bi-directional predicted unit is used for the pixel of current block is divided into priority encoding pixel and predict pixel, carries out bi-directional predicted to obtain bi-directional predicted value in view of the above;
Said single directional prediction unit is used for current block is carried out single directional prediction to obtain the single directional prediction value;
Said final predicting unit is used for said bi-directional predicted value and the weighted sum of single directional prediction value are obtained the final predicted value of current block.
9. system according to claim 8 is characterized in that, said bi-directional predicted unit carries out being used for when bi-directional predicted:
Said priority encoding pixel is carried out predictive coding, and obtain its reconstructed value; In conjunction with the reconstructed value of said priority encoding pixel and the neighbor reconstructed value of current block, the predict pixel in the current block is predicted, obtain the bi-directional predicted value of current block.
10. system according to claim 9 is characterized in that, said bi-directional predicted unit also is used for:
Said predict pixel is divided into forward prediction pixel and bi-directional predicted pixel;
Wherein, said forward prediction pixel only uses neighbor to rebuild to carry out single directional prediction, and said bi-directional predicted pixel uses forward prediction pixel predictors and priority encoding pixel to rebuild bi-directional predicted to carry out.
11. system according to claim 8 is characterized in that, said final predicting unit is said bi-directional predicted value and the weighted sum of single directional prediction value, when obtaining the final predicted value of current block, is used for:
With said bi-directional predicted value and single directional prediction value,, obtain the best weight coefficient of predicted value, and obtain its corresponding current block predicted value, as the final predicted value of current block by different weight weighting summations.
12. to 11 each described systems, it is characterized in that according to Claim 8 said final predicting unit also is used for:
Calculate the residual error of current block original pixel value and said final predicted value, then coding;
After this, trigger the next piece of said bi-directional predicted unit and single directional prediction cell encoding, till the piece in the present encoding unit all disposes.
13. to 11 each described systems, it is characterized in that according to Claim 8,
Said bi-directional predicted unit and/or single directional prediction unit also are used for: in decoding end the piece of coding unit is carried out corresponding bi-directional predicted and/or single directional prediction, obtain corresponding bi-directional predicted value and/or single directional prediction value;
Said final predicting unit also is used for: in decoding end, the final predicted value of calculating current block according to said bi-directional predicted value and/or single directional prediction value is to obtain the reconstructed value of current block.
14. system according to claim 13 is characterized in that, in decoding end, when the piece in the coding unit being carried out bi-directional predicted and single directional prediction, the final predicted value that said final predicting unit is calculated current block is used for when obtaining the reconstructed value of current block:
With bi-directional predicted value that obtains and single directional prediction value, press the weight coefficient weighting summation, obtain the final predicted value of current block; With prediction residual and the said final predicted value addition that decoding obtains, obtain the reconstructed value of current block.
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| WO2012175023A1 (en) | 2012-12-27 |
| CN102843555B (en) | 2017-07-14 |
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