CN102843555B - A kind of intra-frame prediction method and system - Google Patents
A kind of intra-frame prediction method and system Download PDFInfo
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- CN102843555B CN102843555B CN201110174180.1A CN201110174180A CN102843555B CN 102843555 B CN102843555 B CN 102843555B CN 201110174180 A CN201110174180 A CN 201110174180A CN 102843555 B CN102843555 B CN 102843555B
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/105—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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- 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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- H—ELECTRICITY
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
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Abstract
The invention discloses a kind of intra-frame prediction method and system, the pixel of current block can be divided into priority encoding pixel and prediction pixel, carried out accordingly bi-directional predicted to obtain Two-way measured value；Also, current block is carried out single directional prediction to obtain single directional prediction value；By the Two-way measured value and single directional prediction value weighted sum, the final predicted value of current block is obtained.The characteristics of infra-prediction techniques of the present invention make use of video image, the texture information of image can be combined well, the infra-frame prediction precision of video image is improved, reduces residual error, so as to improve the efficiency of Video coding compression.
Description
Technical field
The present invention relates to the communications field, and in particular to a kind of intra-frame prediction method and system.
Background technology
Infra-frame prediction function is all contained in current Advanced Video Coding standard, is predicted and worked as using the pixel of adjacent blocks
Preceding piece, preferably to eliminate the spatial redundancy in single-frame images, so only need to compile the residual error of prediction block and current block
Code.When macro block is using frame mode coding, the block structure forecast block of previously encoded structure of laying equal stress on is utilized.For brightness point
Amount, can be that each block or macro block create prediction block.For example H.264 in coding standard 4 × 4 luminance blocks have 9 kinds can modeling
Formula, 16 × 16 luminance blocks have 4 kinds can lectotype.
In the h .264 standard, the several or institute in 13 sample points (A~L and Q) decoded in adjacent block is utilized
It is some, to predict the sample point (a~p) (as shown in Figure 1) in current 4 × 4 luminance block.Select effect in 9 kinds of predictive modes
Best one kind, is used as the optimum prediction mode of the block.9 kinds of predictive modes include：The DC of pattern 2 is predicted and 8 kinds unidirectional
Predict (as shown in Figure 2).These one-direction prediction modes can be predicted well to directive texture structure.
All reference sample points used in prediction be from oneself encoded mistake region (top or left, such as
Shown in Fig. 3), and the sample point in the not yet coding region of lower section or right is not involved in prediction.Above-mentioned single directional prediction mode is led
The sample point on equidirectional is caused to be assigned to identical predicted value；But in the video frame, a sample point and consecutive points it is bright
Angle value is generally all different, and this will have a strong impact on the infra-frame prediction precision of video image.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of intra-frame prediction method and system, to improve video figure
The infra-frame prediction precision of picture.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of intra-frame prediction method, this method includes：
The pixel of current block is divided into priority encoding pixel and prediction pixel, carried out accordingly bi-directional predicted two-way to obtain
Predicted value；Also, current block is carried out single directional prediction to obtain single directional prediction value；
By the Two-way measured value and single directional prediction value weighted sum, the final predicted value of current block is obtained.
The bi-directional predicted process of the progress includes：
Coding is predicted to the priority encoding pixel, and obtains its reconstructed value；With reference to the priority encoding pixel
The adjacent pixel reconstructed value of reconstructed value and current block, is predicted to the prediction pixel in current block, obtains the two-way of current block
Predicted value.
This method also includes：
The prediction pixel is divided into forward prediction pixel and bi-directional predicted pixel；
Wherein, the forward prediction pixel only rebuilds to carry out single directional prediction, the bi-directional predicted picture using adjacent pixel
Element rebuilds bi-directional predicted to carry out using forward prediction pixel predictors and priority encoding pixel.
By the Two-way measured value and single directional prediction value weighted sum, the process bag of the final predicted value of current block is obtained
Include：
By the Two-way measured value and single directional prediction value, be added by different Weights, obtain predicted value it is best plus
Weight coefficient, and its corresponding current block predicted value is obtained, it is used as the final predicted value of current block.
This method also includes：
The residual error of current block original pixel value and the final predicted value is calculated, is then encoded；
After this, next piece of coding is started, untill the block in current coded unit is all disposed.
This method also includes：
In decoding end, bi-directional predicted and/or single directional prediction is carried out to the block in coding unit, obtains corresponding bi-directional predicted
Value and/or single directional prediction value, calculate the final predicted value of current block to obtain the reconstructed value of current block accordingly.
In decoding end, when the block in coding unit carries out bi-directional predicted and single directional prediction, the calculating current block
Final predicted value is included with the process for obtaining the reconstructed value of current block：
By obtained Two-way measured value and single directional prediction value, by weight coefficient weighting summation, the final pre- of current block is obtained
Measured value；The prediction residual that decoding is obtained is added with the final predicted value, obtains the reconstructed value of current block.
A kind of infra-frame prediction system, the system includes final predicting unit and coupled bi-directional predicted unit, unidirectional
Predicting unit；Wherein,
The bi-directional predicted unit, for the pixel of current block to be divided into priority encoding pixel and prediction pixel, accordingly
Carry out bi-directional predicted to obtain Two-way measured value；
The single directional prediction unit, for obtaining single directional prediction value to current block progress single directional prediction；
The final predicting unit, for by the Two-way measured value and single directional prediction value weighted sum, obtaining current block
Final predicted value.
When the bi-directional predicted unit carries out bi-directional predicted, it is used for：
Coding is predicted to the priority encoding pixel, and obtains its reconstructed value；With reference to the priority encoding pixel
The adjacent pixel reconstructed value of reconstructed value and current block, is predicted to the prediction pixel in current block, obtains the two-way of current block
Predicted value.
The bi-directional predicted unit is additionally operable to：
The prediction pixel is divided into forward prediction pixel and bi-directional predicted pixel；
Wherein, the forward prediction pixel only rebuilds to carry out single directional prediction, the bi-directional predicted picture using adjacent pixel
Element rebuilds bi-directional predicted to carry out using forward prediction pixel predictors and priority encoding pixel.
The Two-way measured value and single directional prediction value weighted sum are obtained the final of current block by the final predicting unit
During predicted value, it is used for：
By the Two-way measured value and single directional prediction value, be added by different Weights, obtain predicted value it is best plus
Weight coefficient, and its corresponding current block predicted value is obtained, it is used as the final predicted value of current block.
The final predicting unit is additionally operable to：
The residual error of current block original pixel value and the final predicted value is calculated, is then encoded；
After this, the bi-directional predicted unit and next piece of single directional prediction cell encoding are triggered, until present encoding
Untill block in unit is all disposed.
The bi-directional predicted unit and/or single directional prediction unit, are additionally operable to：The block in coding unit is carried out in decoding end
Corresponding bi-directional predicted and/or single directional prediction, obtains corresponding Two-way measured value and/or single directional prediction value；
The final predicting unit is additionally operable to：In decoding end, calculated according to the Two-way measured value and/or single directional prediction value
The final predicted value of current block is to obtain the reconstructed value of current block.
In decoding end, when the block in coding unit carries out bi-directional predicted and single directional prediction, the final predicting unit
When calculating reconstructed value of the final predicted value of current block to obtain current block, it is used for：
By obtained Two-way measured value and single directional prediction value, by weight coefficient weighting summation, the final pre- of current block is obtained
Measured value；The prediction residual that decoding is obtained is added with the final predicted value, obtains the reconstructed value of current block.
The characteristics of infra-prediction techniques of the present invention make use of video image, can believe with reference to the texture of image well
Breath, improves the infra-frame prediction precision of video image, reduces residual error, so as to improve the efficiency of Video coding compression.
Brief description of the drawings
Fig. 1 is 4 × 4 pieces of forecast sample point schematic diagrames；
Fig. 2 is 8 kinds of prediction direction schematic diagrames of 4 × 4 pieces of predictions；
Fig. 3 is adjacent block A, B, C relation schematic diagram；
Fig. 4 is the infra-frame prediction flow chart of one embodiment of the invention；
Fig. 5 is current block prediction schematic diagram a；
Fig. 6 is current block prediction schematic diagram 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 present invention；
Fig. 9 is the infra-frame prediction system diagram of the embodiment of the present invention.
Embodiment
In actual applications, because a sample point intermediate value adjacent thereto around sample point is very close to therefore Two-way
The result for surveying (forward and backward) is generally better than single directional prediction.Based on the situation, flow as shown in Figure 4 can be performed, should
Flow comprises the following steps：
The first step：By the block stripe sequence of coding unit, the block in current coded unit is encoded successively；
Second step：The pixel of current block is divided into two classes：One class is priority encoding pixel, is designated as D；Another kind of is prediction
Pixel, is designated as P；
3rd step：Coding is predicted to priority encoding pixel D, and obtains its reconstructed value；
Specifically, the predictive coding can be predicted (such as adjacent using the adjacent pixel reconstructed value of current block
The average of pixel), then prediction residual is encoded.
4th step：It is right with reference to priority encoding pixel D obtained above reconstructed value and the adjacent pixel reconstructed value of current block
Prediction pixel P in current block is predicted, and obtains the Two-way measured value Pb of current block, as shown in Figure 5；
Specifically, the prediction pixel P can also continue to be divided into forward prediction pixel F and bi-directional predicted pixel B.Its
In, forward prediction pixel F is only rebuild to carry out single directional prediction, and before bi-directional predicted pixel B can then be used using adjacent pixel
Rebuild bi-directional predicted to carry out to prediction pixel F predicted values and priority encoding pixel D, as shown in Figure 6.
5th step：Using the adjacent pixel reconstructed value of current block, single directional prediction is carried out to current block, current block is obtained most
Good prediction direction and corresponding single directional prediction value Pd；
6th step：By obtained Two-way measured value Pb and single directional prediction value Pd, it is added by different Weights, obtains pre-
The best weight coefficient W of measured value, and its corresponding current block predicted value is obtained, it is used as the final predicted value Pf of current block；
The weight coefficient W can be represented using several bit, such as 2bit, 4bit, 8bit.
7th step：Current block original pixel value and final predicted value Pf residual error are calculated, then it is encoded.
After this it is returned to which the first step is to start next piece of coding, at the block in current coded unit is whole
Untill reason is finished.
It should be noted that above-mentioned flow is related to the operation carried out in coding side, the line of image can be combined well
Information is managed, the infra-frame prediction precision of video image is improved, residual error is reduced, so as to improve the efficiency of Video coding compression.
In the decoding end corresponding with the operation of above-mentioned coding side, flow as shown in Figure 7 can be carried out, the flow include with
Lower step：
The first step：By the block stripe sequence of coding unit, the block in coding unit is decoded successively；
Second step：Decoding obtains the infra-frame prediction weight coefficient W of current block, if weight coefficient W is represented only with unidirectional pre-
Survey, be then directly entered the 7th step；
3rd step：The pixel of current block is divided into two classes：One class is priority encoding pixel, is designated as D；Another kind of is prediction
Pixel, is designated as P；
4th step：Decoding is predicted to priority encoding pixel D, its reconstructed value is obtained；
It should be noted that the prediction decoding must use with coding side identical Forecasting Methodology, such as using current
The average of the adjacent pixel of block is predicted；Then the prediction residual in code stream is decoded, addition obtains priority encoding picture
Plain D reconstructed value.
5th step：With reference to priority encoding pixel D reconstructed values obtained above and the adjacent pixel reconstructed value of current block, to working as
Prediction pixel P in preceding piece is predicted, and obtains the predicted value Pb of current block；
It should be noted that prediction pixel P can also continue to be divided into forward prediction pixel F and bi-directional predicted pixel B.Its
In, forward prediction pixel F is only rebuild to carry out single directional prediction, and before bi-directional predicted pixel B can then be used using adjacent pixel
Rebuild bi-directional predicted to carry out to prediction pixel F predicted values and priority encoding pixel D.
6th step：If weight coefficient W is represented without single directional prediction, using Pb as current block final predicted value Pf,
It is directly entered the 9th step；Otherwise, into the 7th step.
7th step：Decoding obtains the optimal one-direction prediction modes of current block, right using the adjacent pixel reconstructed value of current block
Current block carries out single directional prediction, obtains the single directional prediction value Pd of current block.If weight coefficient W represents only to use single directional prediction,
Using Pd as final predicted value Pf, the 9th step is directly entered, otherwise into the 8th step；
8th step：By obtained Two-way measured value Pb and single directional prediction value Pd, by weight coefficient W weighting summations, worked as
Preceding piece of final predicted value Pf；
9th step：The prediction residual that decoding is obtained is added with the final predicted value Pf that calculating is obtained, and obtains current block
Reconstructed value.
After this it is returned to which the first step is to start next piece of decoding, at the block in current coded unit is whole
Untill reason is finished.
Understand that the operation thinking of infra-frame prediction of the invention can represent stream as shown in Figure 8 with reference to the description of above technology
Journey, the flow comprises the following steps：
Step 810：The pixel of current block is divided into priority encoding pixel and prediction pixel, carry out accordingly it is bi-directional predicted with
Obtain Two-way measured value；Also, current block is carried out single directional prediction to obtain single directional prediction value.
Step 820：By the Two-way measured value and single directional prediction value weighted sum, the final predicted value of current block is obtained.
In order to ensure that above-mentioned technology description and operation thinking can be realized smoothly, setting as shown in Figure 9 can be carried out.
Referring to Fig. 9, Fig. 9 is the infra-frame prediction system diagram of the embodiment of the present invention, and the system includes final predicting unit and coupled
Bi-directional predicted unit, single directional prediction unit.
In actual applications, the pixel of current block can be divided into priority encoding pixel and prediction picture by bi-directional predicted unit
Element, is carried out bi-directional predicted to obtain Two-way measured value accordingly；Single directional prediction unit can carry out single directional prediction to current block to obtain
To single directional prediction value.The Two-way measured value and single directional prediction value weighted sum can then be obtained current by final predicting unit
The final predicted value of block.
Visible in summary, either method or system, infra-prediction techniques of the invention make use of video image
Feature, the texture information of image can be combined well, the infra-frame prediction precision of video image is improved, residual error is reduced, so as to carry
The efficiency of high Video coding compression.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.
Claims (12)
1. a kind of intra-frame prediction method, it is characterised in that this method includes：
The pixel of current block is divided into priority encoding pixel and prediction pixel, carried out accordingly bi-directional predicted bi-directional predicted to obtain
Value；Also, current block is carried out single directional prediction to obtain single directional prediction value；
By the Two-way measured value and single directional prediction value weighted sum, the final predicted value of current block is obtained；
The bi-directional predicted process of the progress includes：
Coding is predicted to the priority encoding pixel, and obtains its reconstructed value；With reference to the reconstruction of the priority encoding pixel
The adjacent pixel reconstructed value of value and current block, is predicted to the prediction pixel in current block, obtains the bi-directional predicted of current block
Value.
2. according to the method described in claim 1, it is characterised in that this method also includes：
The prediction pixel is divided into forward prediction pixel and bi-directional predicted pixel；
Wherein, the forward prediction pixel is only rebuild using adjacent pixel to carry out single directional prediction, and the bi-directional predicted pixel makes
Rebuild bi-directional predicted to carry out with forward prediction pixel predictors and priority encoding pixel.
3. according to the method described in claim 1, it is characterised in that ask the Two-way measured value and the weighting of single directional prediction value
With obtaining the process of the final predicted value of current block includes：
By the Two-way measured value and single directional prediction value, it is added by different Weights, obtains the best weighting system of predicted value
Number, and its corresponding current block predicted value is obtained, it is used as the final predicted value of current block.
4. the method according to any one of claims 1 to 3, it is characterised in that this method also includes：
The residual error of current block original pixel value and the final predicted value is calculated, is then encoded；
After this, next piece of coding is started, untill the block in current coded unit is all disposed.
5. the method according to any one of claims 1 to 3, it is characterised in that this method also includes：
In decoding end, bi-directional predicted and/or single directional prediction is carried out to the block in coding unit, corresponding Two-way measured value is obtained
And/or single directional prediction value, the final predicted value of current block is calculated accordingly to obtain the reconstructed value of current block.
6. method according to claim 5, it is characterised in that in decoding end, the block in coding unit carries out two-way
When prediction and single directional prediction, the final predicted value of the calculating current block is included with the process for obtaining the reconstructed value of current block：
By obtained Two-way measured value and single directional prediction value, by weight coefficient weighting summation, the final predicted value of current block is obtained；
The prediction residual that decoding is obtained is added with the final predicted value, obtains the reconstructed value of current block.
7. a kind of infra-frame prediction system, it is characterised in that the system includes final predicting unit and coupled bi-directional predicted
Unit, single directional prediction unit；Wherein,
The bi-directional predicted unit, for the pixel of current block to be divided into priority encoding pixel and prediction pixel, is carried out accordingly
It is bi-directional predicted to obtain Two-way measured value；
The single directional prediction unit, for obtaining single directional prediction value to current block progress single directional prediction；
The final predicting unit, for by the Two-way measured value and single directional prediction value weighted sum, obtaining current block most
Whole predicted value；
When the bi-directional predicted unit carries out bi-directional predicted, it is used for：
Coding is predicted to the priority encoding pixel, and obtains its reconstructed value；With reference to the reconstruction of the priority encoding pixel
The adjacent pixel reconstructed value of value and current block, is predicted to the prediction pixel in current block, obtains the bi-directional predicted of current block
Value.
8. system according to claim 7, it is characterised in that the bi-directional predicted unit is additionally operable to：
The prediction pixel is divided into forward prediction pixel and bi-directional predicted pixel；
Wherein, the forward prediction pixel is only rebuild using adjacent pixel to carry out single directional prediction, and the bi-directional predicted pixel makes
Rebuild bi-directional predicted to carry out with forward prediction pixel predictors and priority encoding pixel.
9. system according to claim 7, it is characterised in that the final predicting unit is by the Two-way measured value and list
To predicted value weighted sum, when obtaining the final predicted value of current block, it is used for：
By the Two-way measured value and single directional prediction value, it is added by different Weights, obtains the best weighting system of predicted value
Number, and its corresponding current block predicted value is obtained, it is used as the final predicted value of current block.
10. the system according to any one of claim 7 to 9, it is characterised in that the final predicting unit is additionally operable to：
The residual error of current block original pixel value and the final predicted value is calculated, is then encoded；
After this, the bi-directional predicted unit and next piece of single directional prediction cell encoding are triggered, until current coded unit
In block be all disposed untill.
11. the system according to any one of claim 7 to 9, it is characterised in that
The bi-directional predicted unit and/or single directional prediction unit, are additionally operable to：The block in coding unit is carried out in decoding end corresponding
Bi-directional predicted and/or single directional prediction, obtain corresponding Two-way measured value and/or single directional prediction value；
The final predicting unit is additionally operable to：In decoding end, calculate current according to the Two-way measured value and/or single directional prediction value
The final predicted value of block is to obtain the reconstructed value of current block.
12. system according to claim 11, it is characterised in that in decoding end, the block in coding unit carries out double
To when prediction and single directional prediction, the final predicting unit calculates the final predicted value of current block to obtain the reconstructed value of current block
When, it is used for：
By obtained Two-way measured value and single directional prediction value, by weight coefficient weighting summation, the final predicted value of current block is obtained；
The prediction residual that decoding is obtained is added with the final predicted value, obtains the reconstructed value of current block.
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| WO2017143467A1 (en) | 2016-02-22 | 2017-08-31 | Mediatek Singapore Pte. Ltd. | Localized luma mode prediction inheritance for chroma coding |
| WO2017160117A1 (en) | 2016-03-17 | 2017-09-21 | 세종대학교 산학협력단 | Method and apparatus for processing intra-prediction-based video signal |
| US20180332298A1 (en) * | 2017-05-10 | 2018-11-15 | Futurewei Technologies, Inc. | Bidirectional Prediction In Video Compression |
| CN109495739B (en) * | 2018-10-26 | 2021-01-15 | 杭州联海网络科技有限公司 | Image encoding method and apparatus thereof |
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