CN101626505B - Mode processing method and device thereof of duplex-prediction - Google Patents
Mode processing method and device thereof of duplex-prediction Download PDFInfo
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Abstract
The invention relates to a technique of digital data processing, in particular to a mode processing method and a device thereof of a duplex-prediction. The method is characterized by comprising at least one of a decoding method and a coding method, wherein the decoding method at least comprises one of the following steps: (1) a duplex-prediction marked symbol obtained from code stream analysis marks whether the current macro block adopts a duplex-prediction technique; (2) if the duplex-prediction marked symbol marks that the current macro block adopts the duplex-prediction technique, the size MxN of a first prediction block and the size mxn of a second prediction block satisfy that m is less than or equal to M and n is less than or equal to N; and the MxN block belongs to the current macro block. All the second mxn prediction blocks corresponding to the first MxN prediction block adopt the same predictive mode; and (3) if the duplex-prediction marked symbol marks that the current macro block adopts the duplex-prediction technique, the predictive mode in a second frame is obtained through prediction decoding. The method and the device further optimize the coding performance of the information of the second mode in the duplex-prediction technique, and increase the pitching probability of the duplex-prediction technique in various macro block coding modes so that the coding performance is promoted effectively.
Description
Technical field
The present invention relates to the numerical data treatment technology, particularly relate to a kind of mode treatment method and apparatus of double forecast.
Background technology
The conventional hybrid coding framework is a coding framework of taking all factors into consideration predictive coding, transition coding and entropy coding method, and the residual error data of process predictive coding has reduced spatial coherence and temporal correlation to a certain extent.Thereafter transition coding has further reduced the spatial coherence of residual signals to a certain extent, finally conversion coefficient is quantized further to reduce with entropy coding the redundant information of data.
Predictive coding in the conventional video hybrid encoding frame comprises intraframe predictive coding and inter prediction encoding, sees H.264/AVC standard and AVS standard.
Use the frame of video of intraframe predictive coding technique compresses, be called intracoded frame (I frame).Infra-frame prediction is supported different masses size and different mode.Adopt in the infra-frame prediction be the direction prediction method time, H.264 showing as as in the I4MB pattern in the standard, use the predictive mode and the DC predictive mode of 8 directions; As in the I16MB pattern, use predictive mode, DC predictive mode and the PLANE predictive mode of two directions, in the AVS-P2 standard, show as the predictive mode and the DC predictive mode of 4 directions; The reference point locations of using this moment can be the adjacent position of current pending unit left one row and top delegation, also can be a few row or multirow or a few row or the multiple row position around the current pending unit; Reference value can be pixel value or the coefficient after the conversion of the adjacent position point of current pending unit left one row and top delegation, also can be current pending unit a few row or multirow or the pixel value of a few row or multiple row location point or the coefficient after the conversion on every side; Predicted value is by calculating or the combination or the copy generation of reference value.Pattern information comprises that for intraprediction unit the prediction of active cell divides block size, prediction direction and predictive mode relevant information etc.
The frame of video of inter prediction (time domain prediction) coding techniques compression is called inter-frame encoding frame, interframe encode comprise forward direction, back to two-way prediction (P frame, B frame), support the different masses size.The cataloged procedure of inter-frame encoding frame is following: at first, coded frame is divided into coding unit; Adopt the motion estimation techniques of motion search and motion prediction to obtain motion vector and predicted value to coding unit; Adopt motion compensation technique then, obtain the residual error data behind the inter prediction (time domain prediction).Pattern information is for inter prediction unit, and the prediction that comprises active cell divides block size, reference direction (forward direction, back to or two-way prediction) and the reference number of using, reference key, motion vector etc.Other P16X16 of inter-frame forecast mode information such as macro-block level, P16X8, P8X16, P8X8, B16X16 etc., inferior macro-block level other like P8X4, P4X8, P4X4 etc.
In Chinese patent (application number 200710181975.9) " double forecast video coding/decoding method and device ", propose a kind of decoding method that uses double forecast, seen Fig. 5.The method has broken through the bottleneck of conventional hybrid coding framework; The prediction of secondary is incorporated in the conventional hybrid coding and decoding video framework; Wherein the prediction for image pixel is defined as the first heavily prediction; Be defined as the first heavy residual error to the prediction residual in the conventional hybrid coding and decoding video framework, be defined as the second heavily prediction to prediction to the first heavy residual error.
Generally speaking, the double forecast technology is put forth effort on the performance of further raising predictive coding, and it can not only reduce at residual error shared proportion in code stream, and simultaneously because the lifting of prediction accuracy, the objective quality of compressed encoding rear video also has lifting.
Although the double forecast technology that proposes has had certain coding efficiency to promote, yet still there is very big development potentiality in double forecast.Predict heavily that for second what use in the generative process is the double forecast technology of spatial domain prediction; Through introducing the second molality formula information the second heavy accuracy of predicting is had greatly improved, but the second molality formula information of introducing brings obstacle can for the lifting of double forecast performance.So the coding efficiency that improves the double forecast pattern information is very important.
Summary of the invention
The object of the present invention is to provide a kind of mode treatment method and device thereof that promotes the double forecast of coding efficiency.
The mode treatment method of double forecast of the present invention one of is characterized in that comprising at least in coding/decoding method and the coding method:
It is one of following that said coding/decoding method comprises at least:
Whether the double forecast label symbol sign current macro that (1) obtains from code stream analyzing adopts the double forecast technology;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode obtains through prediction decoding;
It is one of following that said coding method comprises at least:
(1) whether adopts the double forecast technology with double forecast label symbol sign current macro and the double forecast label symbol is write in the code stream through entropy coding;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode writes in the code stream through predictive coding.
A technical solution of apparatus of the present invention is achieved in that it comprises double forecast label symbol resolver, the MxN piece second heavy intra prediction mode prediction decoding device and the second heavy intra prediction mode valuator.Code stream input double forecast label symbol resolver; Whether the output control stream of double forecast label symbol resolver imports the MxN piece second heavy intra prediction mode prediction decoding device, and the output of the MxN piece second heavy intra prediction mode prediction decoding device is connected with the input of the second heavy intra prediction mode valuator;
Another technical solution of apparatus of the present invention is achieved in that it comprises the second heavy intra prediction mode valuator, double forecast label symbol maker, the MxN piece second heavy intra prediction mode predictive coding device.Whether the output that the second heavy intra prediction mode valuator is controlled in the output of double forecast label symbol maker is connected with the input of the MxN piece second heavy intra prediction mode predictive coding device, and double forecast label symbol maker and the MxN piece second heavy intra prediction mode predictive coding device output to code stream respectively.
The beneficial effect that the present invention has is: to existing disadvantages of background technology, further optimized the coding efficiency of the second molality formula information in the double forecast technology.Use the double forecast label symbol to be used for identifying current macro and whether adopt the double forecast technology, increased the probability that the double forecast technology is chosen in various macro-block coding patterns; The first heavy prediction block sizes and the second heavy prediction block sizes do not wait, and heavily prediction is more flexible to make second; Utilize the model prediction value prediction second molality formula information, further compressed the second molality formula information.Comprehensive above three kinds of methods, the present invention has obtained the lifting of coding efficiency on the basis of background technology.
Description of drawings
Fig. 1 is embodiment 6 sketch mapes.
Fig. 2 is embodiment 7 sketch mapes.
Fig. 3 is a directivity prediction sketch map.
Fig. 4 is the corresponding relation sketch map of the first heavy predict blocks and the second heavy predict blocks.
Fig. 5 is the corresponding relation sketch map of intra prediction direction pattern and intra prediction mode value.
Fig. 6 be embodiment 1 with embodiment 2 in rem_pred_mode and ii_mode corresponding relation sketch map during various ii_mp_mode value.
Fig. 7 be embodiment 3 with embodiment 4 in rem_pred_mode and ii_mode corresponding relation sketch map during various ii_mp_mode value.
Fig. 8 is a double forecast video coding/decoding apparatus structure sketch map of the prior art.
Embodiment
The mode treatment method of double forecast of the present invention one of comprises in coding/decoding method and the coding method at least:
It is one of following that said coding/decoding method comprises at least:
Whether the double forecast label symbol sign current macro that (1) obtains from code stream analyzing adopts the double forecast technology;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode obtains through prediction decoding;
It is one of following that said coding method comprises at least:
(1) whether adopts the double forecast technology with double forecast label symbol sign current macro and the double forecast label symbol is write in the code stream through entropy coding;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode writes in the code stream through predictive coding.
Whether the double forecast label symbol sign current macro that (1) obtains from code stream analyzing adopts the double forecast technology;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode.For example first heavily prediction adopt the inter prediction piece of P16x16, and second heavily prediction adopt the intra-frame prediction block of I4x4, the infra-frame prediction of pairing 16 I4x4 of inter prediction piece of this P16x16 just can adopt same pattern to carry out infra-frame prediction so;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode obtains through prediction decoding;
I. the grain direction according to the MxN piece obtains the second molality formula predicted value.Can obtain the second molality formula predicted value with the grain direction of the residual block of the first heavy MxN.But because the residual block of the first heavy MxN is in the decoder non-availability, so the grain direction of the predicted value of in the present technique scheme, heavily being predicted by first of calculating MxN piece draws.For example for second heavily prediction adopt the intra-frame prediction block of I4x4, can this grain direction be quantified as among eight directions of I4x4 infra-frame prediction, the second molality formula predicted value is the mode value of this direction prediction;
Ii. utilize second molality formula predicted value prediction, the second heavy intra prediction mode, and combine from code stream, to resolve the information generation second heavy intra prediction mode that obtains.
The generation method of the second heavy intra prediction mode is following:
A. from code stream, resolve the model prediction that obtains and indicate accurately whether the sign second heavy intra prediction mode is predicted accurately;
B. if model prediction accurately indicates the sign second heavy intra prediction mode prediction accurately, so, the value of the second heavy intra prediction mode equals the second molality formula predicted value;
C. the second heavy intra prediction mode forecasting inaccuracy is true if model prediction accurately indicates sign, so, from code stream, resolves and obtains the second molality formula decoded information.Obtain double intra prediction mode by the second molality formula predicted value and the second molality formula decoded information; For example can adopt the mode decoding method of the infra-frame prediction of I4x4 in the background technology: less than the second molality formula predicted value, the value of the second heavy intra prediction mode is the second molality formula coded message value as if the second molality formula decoded information value; Otherwise less than the second molality formula predicted value, the value of the second heavy intra prediction mode is that the second molality formula coded message value adds 1 as if the second molality formula decoded information value;
Two of the technical solution of the inventive method is achieved in that
(1) whether adopts the double forecast technology with double forecast label symbol sign current macro and the double forecast label symbol is write in the code stream through entropy coding;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode; For example first heavily prediction adopt the inter prediction piece of P16x8, and second heavily prediction adopt the intra-frame prediction block of I4x4, the infra-frame prediction of 8 I4x4 in the inter prediction piece of this P16x16 just can adopt same pattern to carry out infra-frame prediction so;
(3) if double forecast label symbol sign current macro adopts the double forecast technology, so, the second heavy intra prediction mode writes in the code stream through predictive coding;
I. if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy prediction block sizes MxN and the second heavy predict blocks mxn should satisfy m＜=M, n＜=N; The MxN piece belongs to current macro.Pairing all the second heavy mxn predict blocks of the first heavy MxN predict blocks adopt with a kind of predictive mode.For example for second heavily prediction adopt the intra-frame prediction block of I4x4, can this grain direction be quantified as among eight directions of I4x4 infra-frame prediction, the second molality formula predicted value is therewith the mode value of generous this direction prediction;
Ii. after obtaining the second molality formula predicted value, the generation method of the second molality formula coded message is following:
A. indicate accurately with model prediction whether the sign second molality formula is predicted accurately and model prediction is indicated that accurately sign writes in the code stream through entropy coding;
B. if the value of the second heavy intra prediction mode equals the second molality formula predicted value, so, model prediction accurately indicates the prediction of the sign second molality formula accurately;
C. if the value of the second heavy intra prediction mode is not equal to the second molality formula predicted value, so, model prediction indicates that accurately the sign second molality formula forecasting inaccuracy is true.The second molality formula coded message that obtains according to the second heavy intra prediction mode and the second molality formula predicted value, and the second molality formula coded message write in the code stream through entropy coding; For example can adopt the mode decoding method of the infra-frame prediction of I4x4 in the background technology: if the value of the second heavy intra prediction mode is less than the second molality formula predicted value, the second molality formula coded message value equates with the value of the second molality formula; Otherwise if the value of the second heavy intra prediction mode is greater than the second molality formula predicted value, the value that the second molality formula coded message value equals the second heavy intra prediction mode adds 1;
Be practical implementation method of the present invention below:
Embodiment 1:
A kind of mode treatment method of double forecast, coding/decoding method wherein specifically may further comprise the steps:
Step 1: from code stream, resolve and obtain the double forecast label symbol.From code stream, resolve in this example and obtain the double forecast label symbol and adopt the method that from code stream, directly reads the 1bit code word to realize.It is said that the analytic method of double forecast label symbol is not limited to this example among the present invention.The 1bit code word that reads is composed to variable i i_mode_flag.If ii_mode_flag=1, then current macro adopts the double forecast technology; If ii_mode_flag=0, then current macro does not adopt the double forecast technology;
Step 2: if ii_mode_flag=0 does not then carry out the second heavy prediction on intra-frame prediction mode decoding; If ii_mode_flag=1 then carries out the second heavy prediction on intra-frame prediction mode decoding to the whole first heavy MxN predict blocks that belongs to current macro.The piece that first of current macro in this example is heavily predicted is divided as shown in Figure 4, is made up of a 16x8 predict blocks and two 8x8 predict blocks; The second heavy predict blocks adopts the 4x4 predict blocks.First heavily the piece of prediction divide that to be not limited to this example said; It is said that the second heavy prediction block sizes is not limited to this example;
Step 2.1: if ii_mode_flag=1 then resolves from code stream and obtains accurately sign of current 16x8 block mode prediction.From code stream, resolve in this example obtain current 16x8 block mode prediction accurately sign adopt the method that from code stream, directly reads the 1bit code word to realize.It is said that the analytic method that the prediction of MxN block mode accurately indicates among the present invention is not limited to this example.The 1bit code word that reads is composed to variable i i_mode_pred_flag.If ii_mode_pred_flag=1, the then current 16x8 piece second heavy intra prediction mode prediction accurately; If ii_mode_pred_flag=0, the then current 16x8 piece second heavy intra prediction mode forecasting inaccuracy is true;
Step 2.2: utilize the directional information of the first heavy predicted value of current 16x8 piece to generate the second molality formula predicted value of this piece, and the second molality formula predicted value is composed to variable i i_mp_mode.The method of the calculated direction information of using in this example is to use the Sobel operator to judge the maximum direction intensity of the first heavy predicted value of current block.It is said that the method for employed calculated direction information is not limited to this example among the present invention.The computational methods of maximum here direction intensity are the unit for the 16x8 size, use the Sobel operator of 3x3, calculate the directional information of 14x6 point, and this directional information is represented by the tan of angle.It is interval that 360 degree angles, plane are divided into 8 continuous directions; See Fig. 3; Value according to the directional information tan; The directional information of each point will drop on one of 8 directions intervals, calculate after 14x6 the point, and 8 interval statistics decline to such an extent that maximum direction of counting is the indicated direction of maximum direction intensity.The second molality formula predicted value in this example is the identical pairing intra prediction mode value of intra prediction direction pattern of the indicated direction of maximum therewith direction intensity, and the corresponding relation of intra prediction direction pattern and intra prediction mode value is seen Fig. 5.If maximum direction intensity indication vertical direction, then the second molality formula predicted value equals 0.In addition in this example, if the drop point number in the indicated direction interval of maximum direction intensity be not more than 14x6/8 k doubly, will use the DC predictive mode; The second molality formula predicted value equals 2; Wherein k is the direction judgment threshold, and k is 1.5 in this example, and the value of k is not limited to this routine said situation;
Step 2.3: obtain the value of variable i i_mode according to the ii_mode_pred_flag in the step 2.1 and the ii_mp_mode in the step 2.2, and confirm the current 16x8 piece second heavy intra prediction mode according to the value of ii_mode;
(1) as if ii_mode_pred_flag=1, so, ii_mode=ii_mp_mode.Based on Fig. 5, if ii_mode=1, the then current 16x8 piece second heavy intra prediction mode is the horizontal predictive mode; If ii_mode=3, the then current 16x8 piece second heavy intra prediction mode is the diagonal_down_left predictive mode.Situation when ii_mode is worth for other by that analogy;
(2) if ii_mode_pred_flag=0 so, resolves from code stream and obtains the current 16x8 piece second molality formula decoded information.From code stream, resolve in this example and obtain the current 16x8 piece second molality formula decoded information and adopt and from code stream, directly read the 3bit code word and realize.It is said that the MxN piece second molality formula decoded information analytic method is not limited to this example among the present invention.The 3bit code word that reads is composed to variable rem_pred_mode.Obtain the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode.The method that obtains the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode in this example is: in Fig. 6, select a table based on ii_mp_mode, the value of ii_mode equals the corresponding ii_mode value in table of current rem_pred_mode.It is said that the method that obtains the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode among the present invention is not limited to this example.If ii_mp_mode=3, rem_pred_mode=6, ii_mode=7 then, according to Fig. 5, the current 16x8 piece second heavy intra prediction mode is the vertical_left predictive mode; If ii_mp_mode=6, rem_pred_mode=3, ii_mode=3 then, according to Fig. 5, the current 16x8 piece second heavy intra prediction mode is the diagonal_down_left predictive mode;
Step 3: the second heavy intra prediction mode of the current 16x8 piece that the second heavy intra prediction mode of pairing all the second heavy 4x4 predict blocks of current 16x8 piece equals to obtain according to step 2.3.Current 16x8 predict blocks corresponding second a heavy 4x4 predict blocks is seen Fig. 4 in this example, and for piece 1 arrives piece 8, two other 8x8 predict blocks is corresponding blocks 9,10,13,14 and piece 11,12,15,16 respectively;
Step 4: utilize step 2 to carry out the second heavy prediction on intra-frame prediction mode decoding to the method for step 3 to two remaining 8x8 predict blocks.
Embodiment 2:
A kind of double forecast mode treatment method, coding method wherein specifically may further comprise the steps:
Step 1: must generate the double forecast label symbol according to certain criterion, and the double forecast label symbol is write in the code stream through entropy coding.In this example the double forecast label symbol being write the method that is employed in the 1bit code word of writing direct in the code stream in the code stream realizes.The double forecast label symbol writes method in the code stream through entropy coding to be not limited to this example said among the present invention.The 1bit code word that writes in the code stream is composed to variable i i_mode_flag.If ii_mode_flag=1, then current macro adopts the double forecast technology; If ii_mode_flag=0, then current macro does not adopt the double forecast technology;
Step 2: the piece that first of the current macro in this example is heavily predicted is divided as shown in Figure 4, is made up of a 16x8 predict blocks and two 8x8 predict blocks; The second heavy predict blocks adopts the 4x4 predict blocks.First heavily the piece of prediction divide that to be not limited to this example said; It is said that the second heavy prediction block sizes is not limited to this example.First heavily the prediction after; Generate second of pairing all the second heavy 4x4 predict blocks of current 16x8 piece according to certain criterion and weigh intra prediction mode, the second heavy intra prediction mode of pairing all the second heavy 4x4 predict blocks of current 16x8 piece must be identical.Pairing 1 second heavy intra prediction mode to piece 8 of 16x8 predict blocks is identical in this example, and this pattern is changed to the current 16x8 piece second heavy intra prediction mode.According to Fig. 5 the current 16x8 piece second heavy intra prediction mode value is composed to variable i i_mode simultaneously.If the current 16x8 piece second heavy intra prediction mode is the vertical predictive mode, ii_mode=1;
Step 3: if ii_mode_flag=0 does not then carry out the second heavy prediction on intra-frame prediction mode coding; If ii_mode_flag=1 then carries out the second heavy prediction on intra-frame prediction mode coding to belonging to current 16x8 piece;
Step 3.1: utilize the directional information of the first heavy predicted value of current 16x8 piece to generate the second molality formula predicted value of this piece, and the second molality formula predicted value is composed to variable i i_mp_mode.The method of the calculated direction information of using in this example is to use the Sobel operator to judge the maximum direction intensity of the first heavy predicted value of current block.It is said that the method for employed calculated direction information is not limited to this example among the present invention.The computational methods of maximum here direction intensity are the unit for the 16x8 size, use the Sobel operator of 3x3, calculate the directional information of 14x6 point, and this directional information is represented by the tan of angle.It is interval that 360 degree angles, plane are divided into 8 continuous directions; See Fig. 3; Value according to the directional information tan; The directional information of each point will drop on one of 8 directions intervals, calculate after 14x6 the point, and 8 interval statistics decline to such an extent that maximum direction of counting is the indicated direction of maximum direction intensity.The second molality formula predicted value in this example is the identical pairing intra prediction mode value of intra prediction direction pattern of the indicated direction of maximum therewith direction intensity, and the corresponding relation of intra prediction direction pattern and intra prediction mode value is seen Fig. 5.If maximum direction intensity indication vertical direction, then the second molality formula predicted value equals 0.In addition in this example, if the drop point number in the indicated direction interval of maximum direction intensity be not more than 14x6/8 k doubly, will use the DC predictive mode; The second molality formula predicted value equals 2; Wherein k is the direction judgment threshold, and k is 1.5 in this example, and the value of k is not limited to this routine said situation;
Step 3.2: if ii_mode_flag=1; Then generate accurately sign of current 16x8 piece second molality formula prediction, and the accurate sign of current 16x8 piece second molality formula prediction is write in the code stream through entropy coding according to the value of the ii_mode in the step 2 and the value of the ii_mp_mode in the step 3.1.Based on the value of the value of ii_mode and ii_mp_mode generate current 16x8 piece second molality formula prediction accurately the method for sign be: if ii_mode equals ii_mp_mode, accurately the second heavy intra prediction mode prediction of sign sign is accurately in current 16x8 piece second molality formula prediction; If ii_mode is not equal to ii_mp_mode, accurately the sign sign second heavy intra prediction mode forecasting inaccuracy is true in current 16x8 piece second molality formula prediction.In this example current 16x8 block mode prediction is indicated that accurately writing the method that is employed in the 1bit code word of writing direct in the code stream in the code stream realizes.Among the present invention MxN block mode prediction accurately sign write method in the code stream through entropy coding to be not limited to this example said.The 1bit code word that writes in the code stream is composed to variable i i_mode_pred_flag.If current 16x8 piece second molality formula prediction accurately sign identifies the second heavy intra prediction mode prediction accurately, ii_mode_pred_flag=1; If accurately the sign sign second heavy intra prediction mode forecasting inaccuracy is true in preceding 16x8 piece second molality formula prediction, ii_mode_pred_flag=0;
Step 3.3:ii_mode_pred_flag=0 then obtains the value of rem_pred_mode according to the value of the value of ii_mode and ii_mp_mode, the value of rem_pred_mode is the value of the current 16x8 piece second molality formula coded message.After obtaining the current 16x8 piece second molality formula coded message, the second molality formula coded message is write in the code stream through entropy coding.The method that obtains the value of rem_pred_mode based on the value of the value of ii_mode and ii_mp_mode in this example is: in Fig. 6, select a table based on ii_mp_mode, the value of rem_pred_mode equals the value of value corresponding rem_pred_mode in table of current ii_mode.It is said that the method that obtains the value of rem_pred_mode according to the value of the value of ii_mode and ii_mp_mode among the present invention is not limited to this example.If ii_mode=1, ii_mp_mode=2, then rem_pred_mode=l; If ii_mode=2, ii_mp_mode=1, then rem_pred_mode=1.In this example the current 16x8 piece second molality formula coded message being write the method that is employed in the 3bit code word of writing direct in the code stream in the code stream realizes.The MxN piece second molality formula coded message writes method in the code stream through entropy coding to be not limited to this example said among the present invention;
Step 4: utilize step 2 to carry out the second heavy prediction on intra-frame prediction mode coding to the method for step 3 to two remaining 8x8 predict blocks.
Embodiment 3:
A kind of mode treatment method of double forecast, coding/decoding method wherein specifically may further comprise the steps:
Step 1: from code stream, resolve and obtain the double forecast label symbol.From code stream, resolve in this example and obtain method that the double forecast label symbol adopts arithmetic coding and from code stream, read a bin and realize.It is said that the analytic method of double forecast label symbol is not limited to this example among the present invention.A bin who reads is composed to variable i i_mode_flag.If ii_mode_flag=l, then current macro adopts the double forecast technology; If ii_mode_flag=0, then current macro does not adopt the double forecast technology;
Step 2: if ii_mode_flag=0 does not then carry out the second heavy prediction on intra-frame prediction mode decoding; If ii_mode_flag=1 then carries out the second heavy prediction on intra-frame prediction mode decoding to the whole first heavy MxN predict blocks that belongs to current macro.The piece that first of current macro in this example is heavily predicted is divided into two 8x16; The second heavy predict blocks adopts the 8x8 predict blocks.First heavily the piece of prediction divide that to be not limited to this example said; It is said that the second heavy prediction block sizes is not limited to this example;
Step 2.1: if ii_mode_flag=1 then resolves from code stream and obtains accurately sign of current 8x16 block mode prediction.From code stream, resolve in this example obtain current 8x16 block mode prediction accurately sign adopt the method for arithmetic coding from code stream, to read a bin to realize.It is said that the analytic method that the prediction of MxN block mode accurately indicates among the present invention is not limited to this example.A bin who reads is composed to variable i i_mode_pred_flag.If ii_mode_pred_flag=1, the then current 8x16 piece second heavy intra prediction mode prediction accurately; If ii_mode_pred_flag=0, the then current 8x16 piece second heavy intra prediction mode forecasting inaccuracy is true;
Step 2.2: utilize the directional information of the first heavy predicted value of current 8x16 piece to generate the second molality formula predicted value of this piece, and the second molality formula predicted value is composed to variable i i_mp_mode.The method of the calculated direction information of using in this example is to use the Prewitt operator to judge the maximum direction intensity of the first heavy predicted value of current block.It is said that the method for employed calculated direction information is not limited to this example among the present invention.The computational methods of maximum here direction intensity are the unit for the 8x16 size, use the Prewitt operator of 3x3, calculate the directional information of 6x14 point, and this directional information is represented by the tan of angle.It is interval that 360 degree angles, plane are divided into 8 continuous directions; See Fig. 3; Value according to the directional information tan; The directional information of each point will drop on one of 8 directions intervals, calculate after 6x14 the point, and 8 interval statistics decline to such an extent that maximum direction of counting is the indicated direction of maximum direction intensity.The second molality formula predicted value in this example is the identical pairing intra prediction mode value of intra prediction direction pattern of the indicated direction of maximum therewith direction intensity, and the corresponding relation of intra prediction direction pattern and intra prediction mode value is seen Fig. 5.If maximum direction intensity indication vertical direction, then the second molality formula predicted value equals 0.In addition in this example, if the drop point number in the indicated direction interval of maximum direction intensity be not more than 6x14/8 k doubly, will use the DC predictive mode; The second molality formula predicted value equals 2; Wherein k is the direction judgment threshold, and k is 1.5 in this example, and the value of k is not limited to this routine said situation;
Step 2.3: obtain the value of variable i i_mode according to the ii_mode_pred_flag in the step 2.1 and the ii_mp_mode in the step 2.2, and confirm the current 8x16 piece second heavy intra prediction mode according to the value of ii_mode;
(1) as if ii_mode_pred_flag=1, so, ii_mode=ii_mp_mode.Based on Fig. 5, if ii_mode=1, the then current 8x16 piece second heavy intra prediction mode is the horizontal predictive mode; If ii_mode=3, the then current 8x16 piece second heavy intra prediction mode is the diagonal_down_left predictive mode.Situation when ii_mode is worth for other by that analogy;
(2) if ii_mode_pred_flag=0 so, resolves from code stream and obtains the current 8x16 piece second molality formula decoded information.From code stream, resolve in this example and obtain the current 8x16 piece second molality formula decoded information and adopt arithmetic coding method from code stream, to read a bin to realize.It is said that the MxN piece second molality formula decoded information analytic method is not limited to this example among the present invention.A bin who reads is composed to variable rem_pred_mode.Obtain the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode.The method that obtains the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode in this example is: in Fig. 7, select a table based on ii_mp_mode, the value of ii_mode equals the corresponding ii_mode value in table of current rem_pred_mode.It is said that the method that obtains the value of ii_mode by the value of the value of ii_mp_mode and rem_pred_mode among the present invention is not limited to this example.If ii_mp_mode=3, rem_pred_mode=1, ii_mode=8 then, according to Fig. 5, the current 16x8 piece second heavy intra prediction mode is the Horizontal_up predictive mode; If ii_mp_mode=6, rem_pred_mode=4, ii_mode=0 then, according to Fig. 5, the current 16x8 piece second heavy intra prediction mode is the vertical predictive mode;
Step 3: the second heavy intra prediction mode of the current 8x16 piece that the second heavy intra prediction mode of pairing two the second heavy 8x8 predict blocks of current 8x16 piece equals to obtain according to step 2.3.
Step 4: utilize step 2 to carry out the second heavy prediction on intra-frame prediction mode decoding to the method for step 3 to remaining 8x16 predict blocks.
Embodiment 4:
A kind of double forecast mode treatment method, coding method wherein specifically may further comprise the steps:
Step 1: must generate the double forecast label symbol according to certain criterion, and the double forecast label symbol is write in the code stream through entropy coding.In this example the double forecast label symbol write in the code stream and adopt arithmetic coding method in code stream, to write a bin to realize.The double forecast label symbol writes method in the code stream through entropy coding to be not limited to this example said among the present invention.A bin who writes in the code stream is composed to variable i i_mode_flag.If ii_mode_flag=1, then current macro adopts the double forecast technology; If ii_mode_flag=0, then current macro does not adopt the double forecast technology;
Step 2: the piece that first of the current macro in this example is heavily predicted is divided into two 8x16; The second heavy predict blocks adopts the 8x8 predict blocks.First heavily the piece of prediction divide that to be not limited to this example said; It is said that the second heavy prediction block sizes is not limited to this example.First heavily the prediction after; Generate the second heavy intra prediction mode of pairing two the second heavy 8x8 predict blocks of current 8x16 piece according to certain criterion; The second heavy intra prediction mode of pairing two the second heavy 8x8 predict blocks of current 8x16 piece must be identical, and this pattern is changed to the current 8x16 piece second heavy intra prediction mode.According to Fig. 5 the current 16x8 piece second heavy intra prediction mode value is composed to variable i i_mode simultaneously.If the current 16x8 piece second heavy intra prediction mode is the vertical predictive mode, ii_mode=1;
Step 3: if ii_mode_flag=0 does not then carry out the second heavy prediction on intra-frame prediction mode coding; If ii_mode_flag=1 then carries out the second heavy prediction on intra-frame prediction mode coding to belonging to current 8x16 piece;
Step 3.1: utilize the directional information of the first heavy predicted value of current 8x16 piece to generate the second molality formula predicted value of this piece, and the second molality formula predicted value is composed to variable i i_mp_mode.The method of the calculated direction information of using in this example is to use the Prewtt operator to judge the maximum direction intensity of the first heavy predicted value of current block.It is said that the method for employed calculated direction information is not limited to this example among the present invention.The computational methods of maximum here direction intensity are the unit for the 8x16 size, use the Prewitt operator of 3x3, calculate the directional information of 6x14 point, and this directional information is represented by the tan of angle.It is interval that 360 degree angles, plane are divided into 8 continuous directions; See Fig. 3; Value according to the directional information tan; The directional information of each point will drop on one of 8 directions intervals, calculate after 6x14 the point, and 8 interval statistics decline to such an extent that maximum direction of counting is the indicated direction of maximum direction intensity.The second molality formula predicted value in this example is the identical pairing intra prediction mode value of intra prediction direction pattern of the indicated direction of maximum therewith direction intensity, and the corresponding relation of intra prediction direction pattern and intra prediction mode value is seen Fig. 5.If maximum direction intensity indication vertical direction, then the second molality formula predicted value equals 0.In addition in this example, if the drop point number in the indicated direction interval of maximum direction intensity be not more than 6x14/8 k doubly, will use the DC predictive mode; The second molality formula predicted value equals 2; Wherein k is the direction judgment threshold, and k is 1.5 in this example, and the value of k is not limited to this routine said situation;
Step 3.2: if ii_mode_flag=1; Then generate accurately sign of current 8x16 piece second molality formula prediction, and the accurate sign of current 8x16 piece second molality formula prediction is write in the code stream through entropy coding according to the value of the ii_mode in the step 2 and the value of the ii_mp_mode in the step 3.1.Based on the value of the value of ii_mode and ii_mp_mode generate current 8x16 piece second molality formula prediction accurately the method for sign be: if ii_mode equals ii_mp_mode, accurately the second heavy intra prediction mode prediction of sign sign is accurately in current 8x16 piece second molality formula prediction; If ii_mode is not equal to ii_mp_mode, accurately the sign sign second heavy intra prediction mode forecasting inaccuracy is true in current 8x16 piece second molality formula prediction.In this example with the prediction of current 8x16 block mode accurately sign write and adopt arithmetic coding method in code stream, to write a bin in the code stream to realize.Among the present invention MxN block mode prediction accurately sign write method in the code stream through entropy coding to be not limited to this example said.A bin who writes in the code stream is composed to variable i i_mode_pred_flag.If current 8x16 piece second molality formula prediction accurately sign identifies the second heavy intra prediction mode prediction accurately, ii_mode_pred_flag=1; If accurately the sign sign second heavy intra prediction mode forecasting inaccuracy is true in preceding 16x8 piece second molality formula prediction, ii_mode_pred_flag=0;
Step 3.3:ii_mode_pred_flag=0 then obtains the value of rem_pred_mode according to the value of the value of ii_mode and ii_mp_mode, the value of rem_pred_mode is the value of the current 8x16 piece second molality formula coded message.After obtaining the current 8x16 piece second molality formula coded message, the second molality formula coded message is write in the code stream through entropy coding.The method that obtains the value of rem_pred_mode based on the value of the value of ii_mode and ii_mp_mode in this example is: in Fig. 7, select a table based on ii_mp_mode, the value of rem_pred_mode equals the value of value corresponding rem_pred_mode in table of current ii_mode.It is said that the method that obtains the value of rem_pred_mode according to the value of the value of ii_mode and ii_mp_mode among the present invention is not limited to this example.If ii_mode=5, ii_mp_mode=1, then rem_pred_mode=2; If ii_mode=7, ii_mp_mode=2, then rem_pred_mode=2.In this example the current 8x16 piece second molality formula coded message write in the code stream and adopt arithmetic coding method in code stream, to write a bin to realize.The MxN piece second molality formula coded message writes method in the code stream through entropy coding to be not limited to this example said among the present invention;
Step 4: utilize step 2 to carry out the second heavy prediction on intra-frame prediction mode coding to the method for step 3 to two remaining 8x16 predict blocks.
Embodiment 5:
A kind of double forecast mode treatment system; Specifically comprise embodiment 2 described a kind of double forecast mode coding methods and embodiment 1 described a kind of double forecast mode decoding method: obtain double pattern information encoding code stream through embodiment 2 described a kind of double forecast mode coding methods, carry out the double pattern information after code stream decoding can obtain code restoration through embodiment 1 described a kind of double forecast video coding/decoding method.
Embodiment 6:
A kind of double forecast mode treatment device, realization be embodiment 1 described double forecast mode decoding method, see shown in Figure 1ly, mainly may further comprise the steps:
Step 1: code stream input double forecast label symbol resolver, and output double forecast label symbol.Whether the double forecast label symbol decision of output has the MxN block mode in the code stream input MxN piece second heavy intra prediction mode prediction decoding device to predict accurately sign resolver.
Step 2: if there is code stream input MxN block mode to predict accurately sign resolver, then the prediction of MxN block mode indicates that accurately the prediction of resolver output MxN block mode accurately indicates the MxN piece second heavy intra prediction mode maker.Whether MxN block mode prediction accurately sign decision has the code stream input MxN piece second molality formula decoded information resolver.
Step 3: if the code stream input MxN piece second molality formula decoded information resolver is arranged, then the MxN piece second molality formula decoded information resolver output MxN piece second molality formula decoded information is to the MxN piece second heavy intra prediction mode maker.
The step 4:MxN piece second molality formula predicted value maker output MxN piece second molality formula predicted value is to the MxN piece second heavy intra prediction mode maker.
The second heavy intra prediction mode maker input MxN block mode prediction of step 5:MxN piece is sign, the MxN piece second molality formula decoded information and the MxN piece second molality formula predicted value accurately, the output MxN piece second heavy intra prediction mode.
Step 6: the second heavy intra prediction mode valuator input MxN piece second heavy intra prediction mode, the output mxn piece second heavy intra prediction mode.
Embodiment 7:
A kind of double forecast mode treatment device, realization be embodiment 2 described double forecast mode coding methods, see shown in Figure 2ly, mainly may further comprise the steps:
Step 1: the second heavy intra prediction mode valuator input mxn piece second heavy intra prediction mode, the output MxN piece second heavy intra prediction mode;
Step 2: double forecast label symbol maker output double forecast label symbol is to code stream.Whether the double forecast label symbol decision MxN piece second heavy intra prediction mode imports the MxN piece second heavy intra prediction mode predictive coding device;
Step 3: if the MxN piece second heavy intra prediction mode input MxN piece second heavy intra prediction mode predictive coding device, the MxN piece second molality formula predicted value maker output MxN piece second molality formula predicted value is predicted accurate sign maker to the MxN block mode;
Step 4:MxN block mode is predicted accurate sign maker input MxN piece second molality formula predicted value and the MxN piece second heavy intra prediction mode, and the prediction of output MxN block mode accurately indicates code stream.MxN block mode prediction accurately sign determines whether MxN piece second molality formula predicted value and the MxN piece second heavy intra prediction mode import the MxN piece second molality formula coded message maker;
Step 5: if MxN piece second molality formula predicted value and the MxN piece second heavy intra prediction mode input MxN piece second molality formula coded message maker, the MxN piece second molality formula coded message maker output MxN piece second molality formula coded message is to code stream.
Claims (9)
1. the mode treatment method of a double forecast one of is characterized in that comprising at least in coding/decoding method and the coding method:
Said coding/decoding method comprises at least:
Whether the double forecast label symbol sign current macro that (1) obtains from code stream analyzing adopts the double forecast technology, and said double forecast technology comprises heavily to be predicted and second of the first heavy residual error is heavily predicted first of image pixel;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy predict blocks MxN piece and the second heavy predict blocks mxn piece should satisfy m＜=M, n＜=N; Pairing all the second heavy predict blocks mxn pieces of the first heavy predict blocks MxN piece adopt with a kind of second heavy intra prediction mode; The second heavy intra prediction mode of the second heavy predict blocks mxn piece equals the second heavy intra prediction mode of the first heavy predict blocks MxN piece, and the second heavy intra prediction mode of the first heavy predict blocks MxN piece obtains through prediction decoding;
Said coding method comprises at least:
(1) whether adopt the double forecast technology with double forecast label symbol sign current macro and the double forecast label symbol is write in the code stream through entropy coding, said double forecast technology comprises the first heavily prediction and to the second heavily prediction of the first heavy residual error to image pixel;
(2) if double forecast label symbol sign current macro adopts the double forecast technology, then the first heavy predict blocks MxN piece and the second heavy predict blocks mxn piece should satisfy m＜=M, n＜=N; Pairing all the second heavy predict blocks mxn pieces of the first heavy predict blocks MxN piece adopt with a kind of second heavy intra prediction mode; The second heavy intra prediction mode of the second heavy predict blocks mxn piece is identical with the second heavy intra prediction mode of the first heavy predict blocks MxN piece, and this second heavy intra prediction mode is write code stream through predictive coding.
2. the mode treatment method of double forecast according to claim 1 is characterized in that the second heavy intra prediction mode of described predict blocks MxN piece adopts following mode to obtain through prediction decoding:
(1) from code stream, resolves the model prediction that obtains and indicate accurately whether the sign second heavy intra prediction mode is predicted accurately;
(2) if model prediction accurately indicates the sign second heavy intra prediction mode prediction accurately, so, the value of the second heavy intra prediction mode equals the second molality formula predicted value;
(3) the second heavy intra prediction mode forecasting inaccuracy is true if model prediction accurately indicates sign, so, from code stream, resolves and obtains the second molality formula decoded information; Obtain the second heavy intra prediction mode by the second molality formula predicted value and the second molality formula decoded information.
3. the mode treatment method of double forecast according to claim 2 is characterized in that the said second molality formula predicted value is drawn by the grain direction of the first heavy predict blocks MxN piece.
4. the mode treatment method of double forecast according to claim 3 is characterized in that the grain direction of the described first heavy predict blocks MxN piece equals the grain direction of the first heavy predict blocks of this piece.
5. the mode treatment method of double forecast according to claim 1, the second heavy intra prediction mode of the described first heavy predict blocks MxN piece writes after predictive coding in the code stream, it is characterized in that:
(1) indicates accurately with model prediction whether the sign second molality formula is predicted accurately and model prediction is indicated that accurately sign writes in the code stream through entropy coding;
(2) if the value of the second heavy intra prediction mode equals the second molality formula predicted value, so, model prediction accurately indicates the prediction of the sign second molality formula accurately;
(3) if the value of the second heavy intra prediction mode is not equal to the second molality formula predicted value, so, model prediction indicates that accurately the sign second molality formula forecasting inaccuracy is true; Obtain the second molality formula coded message according to the second heavy intra prediction mode and the second molality formula predicted value, and the second molality formula coded message is write in the code stream through entropy coding.
6. according to the mode treatment method of the said double forecast of claim 5, it is characterized in that the described second molality formula predicted value is drawn by the grain direction of the first heavy predict blocks MxN piece.
7. according to the mode treatment method of the said double forecast of claim 6, it is characterized in that the grain direction of the described first heavy predict blocks MxN piece equals the grain direction of the first heavy predict blocks of this piece.
8. the mode treatment device of a double forecast is characterized in that comprising double forecast label symbol resolver, the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device and the second heavy intra prediction mode valuator; Code stream input double forecast label symbol resolver; Whether the output control stream of double forecast label symbol resolver imports the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device, and the output of the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device is connected with the input of the second heavy intra prediction mode valuator; The first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device comprises preparatory first resurvey piece MxN block mode prediction accurately sign resolver, the first heavy predict blocks MxN piece second molality formula decoded information resolver, the first heavy predict blocks MxN piece second molality formula predicted value maker, the first heavy predict blocks MxN piece second heavy intra prediction mode maker; Whether the first heavy predict blocks MxN block mode prediction of the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device output accurately sign decision code stream is input to the first heavy predict blocks MxN piece second molality formula decoded information resolver; The first heavy predict blocks MxN piece second molality formula predicted value of the accurate sign of the first heavy predict blocks MxN block mode prediction of the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device output, the first heavy predict blocks MxN piece second molality formula decoded information of the first heavy predict blocks MxN piece second molality formula decoded information resolver output, the first heavy predict blocks MxN piece second molality formula predicted value maker output is input to the first heavy predict blocks MxN piece second heavy intra prediction mode maker; The output of the first heavy predict blocks MxN piece second heavy intra prediction mode prediction decoding device is the output of the first heavy predict blocks MxN piece second heavy intra prediction mode maker.
9. a double forecast mode treatment device is characterized in that comprising the second heavy intra prediction mode valuator, double forecast label symbol maker, the first heavy predict blocks MxN piece second heavy intra prediction mode predictive coding device; The input of the second heavy intra prediction mode valuator is the second heavy predict blocks mxn piece second heavy intra prediction mode, and output is that the output of the first heavy predict blocks MxN piece second heavy intra prediction mode value double forecast label symbol maker determines whether the output first heavy predict blocks MxN piece second heavy intra prediction mode value of the second heavy intra prediction mode valuator is input to the first heavy predict blocks MxN piece second heavy intra prediction mode predictive coding device; Double forecast label symbol maker output double forecast label symbol is to code stream; The first heavy predict blocks MxN piece second heavy intra prediction mode predictive coding device comprises that the first heavy predict blocks MxN piece second molality formula predicted value maker, the first heavy predict blocks MxN block mode predict the accurate sign maker and the first heavy predict blocks MxN piece second molality formula coded message maker; The first heavy predict blocks MxN piece second molality formula predicted value of the first heavy predict blocks MxN piece second molality formula predicted value maker output, the first heavy predict blocks MxN piece second heavy intra prediction mode value are the input that predict blocks MxN block mode is predicted accurate sign maker; The first heavy predict blocks MxN block mode predicts that accurate sign maker is output as accurately sign of the first heavy predict blocks MxN block mode prediction, and said predict blocks MxN block mode prediction accurately sign is the output of the first heavy MxN piece second heavy intra prediction mode predictive coding device; The first heavy predict blocks MxN block mode predicts that accurate standard determines whether the first heavy predict blocks MxN piece second molality formula predicted value and the first heavy predict blocks MxN piece second heavy intra prediction mode value are input to the first heavy predict blocks MxN piece second molality formula coded message maker; The first heavy predict blocks MxN piece second molality formula coded message of the first heavy predict blocks MxN piece second molality formula coded message maker output is the output of the first heavy predict blocks MxN piece second heavy intra prediction mode predictive coding device; Code stream is write in the output of the first heavy predict blocks MxN piece second heavy intra prediction mode predictive coding device.
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