CN104301729B - A kind of bit rate control method of feedback-less distributed video coding - Google Patents
A kind of bit rate control method of feedback-less distributed video coding Download PDFInfo
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Abstract
The present invention discloses a kind of bit rate control method of feedback-less distributed video coding, mainly solves in feedback-less distributed video coding system, and the Rate Control problem to Wyner Ziv frames is realized in coding side.This method is to increase rate control module in coding side, and the module includes two parts：（1）Calculating source WZ frames and adjacent key frame and choose quantization matrix in the correlation of each coefficient tape of DCT domain according to coefficient correlation；（2）Carry out low complicated side information estimation, the Data Rate Distribution of bit plane.The inventive method realizes the control to code check, reduces the complexity and decoding delay of decoding end on the basis of the low computational complexity of coding side is ensured.
Description
Technical field
The present invention relates to the bit rate control method of the coding side of feedback-less distributed video coding, belongs to distributed video volume
Code field.
Background technology
Traditional Video coding mode be in coding side, carry out complexity estimation come remove adjacent video frames when
Between redundancy, cause the computational complexity of coding side to be significantly larger than decoding end, this coded system is unfavorable for low-power consumption encoding device
Realization.In order to solve the above problems, lossless coding theory and Wyner and Ziv based on Slapian and Wolf damage volume
Code is theoretical, generates distributed video coding (DVC, Distributed Video Coding) technology.At present than more typical
Distributed video coding system, it is by the Wyner-Ziv based on transform domain of the propositions such as the Bernd Girod of Stanford universities
Video coding system, and the PRISM based on transform domain of the proposition such as Kannan Ramchandran of Berkeley universities are regarded
Frequency coded system.Compared with PRISM systems, the coding of the Wyner-Ziv coded systems based on transform domain of DISCOVER groups
Device complexity is lower, and can make full use of time and the spatial coherence of frame of video, therefore most of researchs concentrate on Wyner-
On Ziv method for video coding.
In distributed video coding system, the control of code check affects the performance of whole system, is transmitted across more verifications
Bit can cause the wasting of resources, reduce the distortion performance of system；And the check bit number transmitted is inadequate, then decoder can not be just
Really decoding Wyner-Ziv frames.In DISCOVER encoding schemes, using a feedback channel, decoding end is when decoding failure, then
To the check bit of coding side request greater number, untill being correctly decoded.This Rate Control side based on feedback mechanism
Method can improve code efficiency, but the complexity and time delay of whole system have also been significantly greatly increased simultaneously, limit DVC video communications
Systematic difference.C Brites, the F Pereira of DISCOVER research groups in Europe et al. is proposed, and is used in coding side
Low-complexity motion algorithm for estimating generates coarse side information, and each coded-bit is put down by the coarse side information and source WZ frames
The code check in face is estimated.Song Bin, Yang Mingming of ISN National Key Laboratories et al. propose a point code check control for three layers of progress
System, i.e. GOP layer bit rates are distributed, the code check of key frame and WZ frames in each GOP, for the correlation meter of WZ frame usage factor band levels
Correlated noise model parameter, and LDPC check matrixes corresponding to selection are calculated, proposes the feedback-less bit-plane speed control side of WZ frames
Method.
The present invention proposes a kind of feedback-less rate control algorithm based on distributed video coding, and it is utilized between each frame
Coefficient tape level correlation, choose optimum quantization matrix；Then the coarse side information caused by, is realized to code check on bit plane
Control, to improve the distortion performance of whole distributed video coding system.
The content of the invention
Technical problem：The present invention discloses a kind of bit rate control method of feedback-less Wyner-Ziv Video codings, and it is to belong to
Distributed video coding technical field, mainly solve in feedback-less distributed video coding system, realized in coding side
To the Rate Control problem of Wyner-Ziv frames.
Technical scheme：A kind of bit rate control method of feedback-less distributed video coding of the present invention, this method is to compile
Code end increase rate control module, the module include two parts：(1) source WZ frames are calculated with adjacent key frame in each of DCT domain
The correlation of coefficient tape, and quantization matrix is chosen according to coefficient correlation；(2) low complicated side information estimation is carried out, bit plane
Data Rate Distribution.
1. the method includes the steps of：
1. source WZ frames XtWith adjacent key frame XbAnd Xf4 × 4 pieces of dct transform is carried out respectively, produces 16 coefficient tapes.
2. calculate source WZ frames XtWith adjacent key frame XbAnd XfThe maximum correlation mse on each coefficient tape in DCT domaink
=min { mseb k, msef k(k=1,2 ... 16).Wherein mseb kAnd msef kIt is X respectivelytWith XbAnd XtWith XfEach coefficient tape on
Mean square deviation.
3. the quantization bit of the DC coefficient tapes of WZ frames is determined according to the quantization parameter QP of key frame, according to correlation msekWith
The threshold values T of settingkSize determine the quantization bits of AC coefficient tapes, finally determine optimal quantization matrix.
4. producing the side information of low complex degree, and 4 × 4 pieces of dct transform and quantization are carried out to it.Then with after quantization
WZ frames, calculate conditional entropy H (X | Y) error probability P of each bit-planecros, carry out bit plane Data Rate Distribution.
2. the bit rate control method of the feedback-less distributed video coding according to 1, the step 2. in, according to as follows
Formula and step calculate correlation：
The present invention represents the correlation of interframe using mean square error mse, then k-th of the system of WZ frames and key frame in DCT domain
The calculation formula of the correlation of number band is as follows：
Wherein,WithThe corresponding WZ frames and key of k-th of coefficient tape of DCT domain are represented respectively
Value on frame；M and N represents the length and width of frame respectively；B is the size of the block of dct transform, in the present invention B=4.
Maximum correlation calculation procedure：
1. source WZ frames X is calculated according to formula (1)tWith adjacent key frame XbCorrelation mse on this 16 coefficient tapesb k(k=
1,2…16)。
2. source WZ frames X is calculated according to formula (1)tWith adjacent key frame XfCorrelation mse on this 16 coefficient tapesf k(k=
1,2…16)。
3. calculate source WZ frames XtWith adjacent key frame XbAnd XfThe maximum correlation mse on each coefficient tape in DCT domaink
=min { mseb k, msef k(k=1,2 ... 16).
3. the bit rate control method of the feedback-less distributed video coding according to 1, the step 3. in, according to as follows
Method choice quantization matrix：
According to the parameter QP of key frame determine WZ frames DC coefficient tapes quantization step, with reduce reconstruct after key frame with
Picture quality shake between WZ frames.For AC coefficient tapes, according to its maximum correlation coefficient msek(k=2,3 ... 16) and setting
Each coefficient tape threshold values TkBetween magnitude relationship, determine this coefficient tape choose quantization bit Mk.Then each coefficient is used
The quantization bit of band forms the quantization matrix Q used in the present invention.
Beneficial effect：The present invention compared with prior art, has advantages below：
The inventive method relative to existing feedback-less bit rate control method, by calculating the correlation of each coefficient tape,
The big coefficient tape of correlation improves the distortion performance of this Wyner-Ziv video coding system without encoding；Meanwhile
The amount of calculation of introducing is concentrated mainly on the estimation of the correlation to each coefficient tape, from the amount of calculation of whole coding side very
It is small.
Brief description of the drawings
Fig. 1 is the system framework figure of the present invention.
Fig. 2 is a kind of concrete composition of the bit rate control method of feedback-less distributed video coding of the present invention.
Embodiment
Make further instantiation to the present invention with embodiment below in conjunction with the accompanying drawings to describe.
Fig. 1 is the system framework figure of the present invention.Present invention contemplates that increase in the decoding end part of distributed video coding
Add rate control module, the module specific implementation method it is as shown in Figure 2.Specific implementation step is as follows：
1. source WZ frames XtWith adjacent key frame XbAnd Xf4 × 4 pieces of dct transform is carried out respectively, produces 16 coefficient tapes.
2. use formula
Wherein,WithThe corresponding WZ frames and key of k-th of coefficient tape of DCT domain are represented respectively
Value on frame；M and N represents the length and width of frame respectively；B is the size of the block of dct transform, in the present invention B=4.Calculate respectively
Source WZ frames XtWith adjacent key frame XbAnd XfThe correlation mse on each coefficient tape in DCT domainb kAnd msef k, then calculate
The maximum correlation mse of the WZ framesk=min { mseb k, msef k(k=1,2 ... 16).
3. the quantization bit M of the DC coefficient tapes of WZ frames is determined according to the quantization parameter QP of key frame1, reduce in decoding end weight
Picture quality shake between key frame and WZ frames after structure.
4. judge the correlation mse having calculated thatkWhether the threshold values T of setting is more thank, and according to following judgement mode：
Wherein, MQ1 kAnd MQ8 kIt is the quantization bit on quantization matrix Q1 and Q8 k-th of coefficient tape, M1It is according to key frame
The quantization bit of identified DC coefficient tapes, threshold values TkIt is the half of the quantization step of DC coefficient tapes.It is determined that each AC coefficient tapes
Quantization bit, finally determine optimal quantization matrix Q.It is can be seen that from quantization matrix Q1 and Q8 for coefficient tape x16, its amount
It is 0 to change bit；For coefficient tape x2And x3, its quantization bit do not influenceed by correlation；For remaining coefficient tape, work as correlation
During more than threshold values, its quantization bit is 0, i.e. this coefficient tape is directly replaced without quantization encoding in decoding end using side information.
5. according to the adjacent key frame X of source WZ framesbAnd Xf, utilize average interpolation (AI) algorithm and quick motion compensated interpolation
(FMCI) algorithm produces the side information of low complex degreeAnd 4 × 4 pieces of dct transform is carried out to this side information, use what is calculated
Quantization matrix Q is quantified.
6. by the WZ frames after quantization and prediction side information, the bit of identical weights is formed a position from a high position to low level
Plane, the conditional entropy H (X | Y) and error probability P of each bit-plane are then calculated using equation below respectivelycros。
H (X | Y)=- Pcros×lbPcros-(1-Pcros)×lb(1-Pcros)
Wherein,And Yi bRepresent WZ frames respectively and estimate i-th of bit value of b-th of bit-plane of side information.
7. according to the conditional entropy H of the bit-plane that has calculated that (X | Y) and error probability Pcros, use formulaCalculate the code check R of n-th of bit-planen, then, this Rate Control LDPC
Coding module carries out the LDPC codings of this bit plane.
Claims (1)
1. a kind of bit rate control method of feedback-less distributed video coding, the method includes the steps of：
1. source WZ frames XtWith adjacent key frame XbAnd Xf4 × 4 pieces of dct transform is carried out respectively, produces 16 coefficient tapes；
2. calculate source WZ frames XtWith adjacent key frame XbAnd XfThe maximum correlation mse on each coefficient tape in DCT domaink=min
{mseb k, msef k(k=1,2 ... 16)；Wherein mseb kAnd msef kIt is X respectivelytWith XbAnd XtWith XfEach coefficient tape on it is square
Difference；
3. the quantization bit of the DC coefficient tapes of WZ frames is determined according to the quantization parameter QP of key frame, according to correlation msekWith setting
Threshold TkSize determine the quantization bits of AC coefficient tapes, finally determine optimal quantization matrix；
4. producing the side information of low complex degree, and 4 × 4 pieces of dct transform and quantization are carried out to it；Then with the WZ after quantization
Frame, calculate conditional entropy H (X | Y) error probability P of each bit-planecros, carry out bit plane Data Rate Distribution；
The step 2. in, calculate correlation according to equation below and step：
The correlation of interframe is represented using mean square error mse, then WZ frames and key frame DCT domain k-th of coefficient tape it is related
The calculation formula of property is as follows：
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Wherein,WithOn corresponding the WZ frames and key frame of k-th of coefficient tape for representing DCT domain respectively
Value；M and N represents the length and width of frame respectively；B be dct transform block size, B=4；
Maximum correlation calculation procedure：
2. -1) source WZ frames X is calculated according to formula (1)tWith adjacent key frame XbCorrelation mse on this 16 coefficient tapesb k(k=1,
2…16)；
2. -2) source WZ frames X is calculated according to formula (1)tWith adjacent key frame XfCorrelation mse on this 16 coefficient tapesf k(k=1,
2…16)；
2. -3) calculate source WZ frames XtWith adjacent key frame XbAnd XfThe maximum correlation mse on each coefficient tape in DCT domaink=
min{mseb k, msef k(k=1,2 ... 16)；
The step 3. in, select quantization matrix as follows：
The quantization step of the DC coefficient tapes of WZ frames is determined according to the parameter QP of key frame, to reduce the key frame after reconstructing and WZ frames
Between picture quality shake；For AC coefficient tapes, according to its maximum correlation coefficient msek(k=2,3 ... 16) is each with setting
The threshold T of coefficient tapekBetween magnitude relationship, determine this coefficient tape choose quantization bit Mk, then using each coefficient tape
Quantization bit forms this used quantization matrix Q；Specially：
3. -1) the quantization bit M of the DC coefficient tapes of WZ frames is determined according to the quantization parameter QP of key frame1, reduce and reconstructed in decoding end
Picture quality shake between key frame and WZ frames afterwards；
3. -2) judge the correlation mse having calculated thatkWhether the threshold T of setting is more thank, and according to following judgement mode：
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Wherein, MQ1 kAnd MQ8 kIt is the quantization bit on quantization matrix Q1 and Q8 k-th of coefficient tape, M1It is true according to key frame institute
The quantization bit of fixed DC coefficient tapes, threshold values TkIt is the half of the quantization step of DC coefficient tapes；It is determined that the amount of each AC coefficient tapes
Change bit, finally determine optimal quantization matrix Q；It is can be seen that from quantization matrix Q1 and Q8 for coefficient tape x16, it quantifies ratio
Specially for 0；For coefficient tape x2And x3, its quantization bit do not influenceed by correlation；For remaining coefficient tape, when correlation is more than
During threshold, its quantization bit is 0, i.e. this coefficient tape is directly replaced without quantization encoding in decoding end using side information；
3. -3) according to the adjacent key frame X of source WZ framesbAnd Xf, utilize average interpolation (AI) algorithm and quick motion compensated interpolation
(FMCI) algorithm produces the side information of low complex degreeAnd 4 × 4 pieces of dct transform is carried out to this side information, use what is calculated
Quantization matrix Q is quantified；
3. -4) bit of identical weights is formed into a position by the WZ frames after quantization and prediction side information from a high position to low level
Plane, the conditional entropy H (X | Y) and error probability P of each bit-plane are then calculated using equation below respectivelycros；
H (X | Y)=- Pcros×lbPcros-(1-Pcros)×lb(1-Pcros)
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Wherein,And Yi bRepresent WZ frames respectively and estimate i-th of bit value of b-th of bit-plane of side information；
3. -5) according to the conditional entropy H of the bit-plane that has calculated that (X | Y) and error probability Pcros, use formulaCalculate the code check R of n-th of bit-planen, then, this Rate Control LDPC
Coding module carries out the LDPC codings of this bit plane.
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| CN101835042A (en) * | 2010-03-19 | 2010-09-15 | 西安电子科技大学 | Wyner-Ziv video coding system controlled on the basis of non feedback speed rate and method |
| CN102186077A (en) * | 2011-05-04 | 2011-09-14 | 西安电子科技大学 | Wyner-Ziv-video-coding-based Wyner-Ziv frame code rate control system and method |
| CN102271256A (en) * | 2011-09-16 | 2011-12-07 | 河海大学常州校区 | Mode decision based adaptive GOP (group of pictures) distributed video coding and decoding method |
| CN102857760A (en) * | 2012-09-29 | 2013-01-02 | 中国科学院计算技术研究所 | Feedback-free code rate optimization distributed video encoding and decoding method and system |
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| CN101835042A (en) * | 2010-03-19 | 2010-09-15 | 西安电子科技大学 | Wyner-Ziv video coding system controlled on the basis of non feedback speed rate and method |
| CN102186077A (en) * | 2011-05-04 | 2011-09-14 | 西安电子科技大学 | Wyner-Ziv-video-coding-based Wyner-Ziv frame code rate control system and method |
| CN102271256A (en) * | 2011-09-16 | 2011-12-07 | 河海大学常州校区 | Mode decision based adaptive GOP (group of pictures) distributed video coding and decoding method |
| CN102857760A (en) * | 2012-09-29 | 2013-01-02 | 中国科学院计算技术研究所 | Feedback-free code rate optimization distributed video encoding and decoding method and system |
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