CN107222749A - A kind of chaos code constructing method for wireless video transmission - Google Patents
A kind of chaos code constructing method for wireless video transmission Download PDFInfo
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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
- H04N19/169—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
- H04N19/177—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 a group of pictures [GOP]
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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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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Abstract
The present invention relates to a kind of chaos code constructing method for wireless video transmission, comprise the following steps：S1, original video sequence is divided into multiple GOP, obtains each GOP DCT coefficient matrix, be the first real number symbol sebolic addressing by the DCT coefficient matrix conversion；S2, step S1 the first real number symbol sebolic addressing is mapped as by the second real number symbol sebolic addressing by the chaotic maps function of design；S3, the second real number symbol sebolic addressing obtained to step S2 carry out power distribution.Compared with prior art, the present invention makes full use of chaos system to the high sensitivity characteristic and the feature of extended distance of original state, simulation chaotically coding is applied in image/video transmission, with the robustness for improving transmission of video, the advantages of strengthening the reconstruction quality of transmission of video.
Description
Technical field
The present invention relates to wireless video transmission field, constructed more particularly, to a kind of Constructing Chaotic Code for wireless video transmission
Method.
Background technology
Nowadays, with the increasingly popularization of mobile Internet and widely using for intelligent terminal, web database technology presents quick-fried
Fried property increases, wherein especially increasing most fast with image/video data.The newest report of Cisco's visual web statistics is shown, from 2016
Mobile video will increase by 8.7 times, be ranked first in the growth rate of all Mobile solutions by 2021 in year.It is mobile by 2021
Video will account for the 78% of mobile data total flow.On the other hand, traditional image/video reliability of communication system is relatively low, wired network
The bandwidth time variation of network or the channel time variation of Radio Link cause image/video transmission mosaic occur or even break, and cause
The bottleneck of systematic function.There is following problem in wireless video research field：One is mobility, such as user is hand-held
Mobile equipment, position is ceaselessly changing, thus its channel be also in change, so the quality of channel be also
Do not stop change；Two be the broadcast transmission for wireless video, and different users are in different places, and channel also has diversity special
Property；Three be the popularization with Video Applications, and receiving terminal is from mobile phone to each one computer, their temporal resolution and spatial resolution
It is all different.It is desirable to the quality that the transmission of video is obtained, it can be reached in certain range of channels quality relatively good
Video quality, at the same time, it is desirable to which the quality of video can support multiresolution, including temporal resolution and spatial resolution.
In digital display circuit, channel coding is used to the bit stream of protection compression, and Analogvideotransmission also has similar want
Ask.In Analogvideotransmission, without quantifying and entropy code, transmission be real value conversion coefficient, it is therefore traditional limited
Domain channel coding is no longer applicable.Coding in analog image transmission of video is real coding, and we mainly study therein one
Plant chaotically coding.
Early in the beginning of the eighties in last century, Wolf and Marshall have just each proposed relevant analog error correction coding respectively
Concept.It is named as real coding in Marshall research work, it is referred to as into simulation in Wolf research compiles
Code.Similar to the general principle of digital error correction, the good analog encoding of a performance should effectively amplify Europe by extended distance
Family name's distance.Chen and Wornell has found that chaos dynamical system has the characteristics of this is excellent.It iteratively calls chaos
Function generates signal sequence.Chaotic function is characterised by their rapid divergence, i.e. buterfly effect.The effect means
Even the very small difference in initial input will also cause visibly different signal sequence quickly.From the angle of extended distance
From the point of view of, this shows a pair of points closely in information source space, and the sequence after its coding will produce very big distance.Cause
They propose first simulation chaotically coding for this, and this code Design is directly using non-linear and real value chaos Tent map
It is used as channel coding.Liu will also simulate chaotically coding and be encoded for the pixel directly to image, because pixel is present largely
Room and time redundancy, therefore efficiency is very low, and this does not meet the real scene of image/video transmission.The above is simulated
Chaotically coding is all based on input information source obedience and is uniformly distributed and designs, but this hypothesis is not particularly suited for image and regarded
Frequently.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is used for wireless video
The chaos code constructing method of transmission.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of chaos code constructing method for wireless video transmission, comprises the following steps：
S1, original video sequence is divided into multiple GOP, each GOP DCT coefficient matrix obtained, by the DCT coefficient
Matrix conversion is the first real number symbol sebolic addressing s；
S2, the first real number symbol sebolic addressing s described in step S1 is mapped as by the second real number by the chaotic maps function of design
Symbol sebolic addressing, the formula of the chaotic maps function is：
S3, the second real number symbol sebolic addressing obtained to step S2 carry out power distribution.
The process that each GOP DCT coefficient matrix is obtained in the step S1 is specifically included：To each GOP points of division
Not carry out 3-dimensional dct transform, obtain DCT coefficient matrix SL×W×G, wherein, L is height of the video sequence per two field picture, and W is video
Width of the sequence per two field picture, G is the frame number of video sequence in a GOP.
The DCT coefficient matrix conversion is specifically included for the first real number symbol sebolic addressing in the step S1：By DCT coefficient
Matrix SL×W×GIn element by row take out successively, then connect successively be arranged as single file the first real number symbol sebolic addressing s=s [i],
I=0,1 ..., L × W × G-1 }.
The second real number symbol sebolic addressing x=that the step S2 is obtained x (i), i=0,1 ..., and L × W × G × n-1 } table
Show, its length is m × n, wherein, m=L × W × G, n is bandwidth expansion factor.
The step S3 is specifically included：
S31, the second real number symbol sebolic addressing is recompiled, be converted into the real number matrix of two dimension
Xchunk_num×chunk_size, wherein, chunk_num represents the block number in a GOP, and chunk_size represents block interior element
Number；
S32, use pjJ-th piece of power, p are distributed in expressionjCalculation formula be：
Wherein, gjThe power-scaling factors of j-th piece of expression, λjJ-th piece of variance before analog encoding is represented,'s
Calculation formula is：
Wherein, P represents general power, λjJ-th piece of the variance extended after ' expression process analog encoding, j=0,
1,…,chunk_num-1。
Compared with prior art, the present invention has advantages below：
1st, compared with traditional wireless video digit transmission method, the present invention makes full use of adaptive in analog encoding modulation
Ying Xing, introduces the chaotic function based on analog encoding in pseudo-analog transmission SoftCast, can resist the letter in being wirelessly transferred
Road noise and the robustness for improving data transfer, the reconstruction quality of transmission of video is strengthened while power utilization is improved.
2nd, encoded for the analog channel that real value is inputted, will be based on simulation using the DCT coefficient after conversion as input information source
The chaotic function of coding is used for DCT code elements, iteratively calls some predefined chaotic maps functions to generate signal sequence
Row, because a pair of small distance points in information source space will produce very big range difference in space encoder, utilize chaos
The feature of the extended distance of dynamical system can generate the analog signal with robustness.
3rd, the chaotic maps function proposed from small to the signal of medium value for that can keep linear relationship, and big signal is reflecting
Penetrating under the nonlinear characteristic of function to be folded back, for the input signal of class Gauss, and the output of coding still keeps similar substantially
Statistical property, reduction power punishment, compared with input power, power output is increased slightly.
4th, the present invention solves the class Gaussian source power punishment problem for natural image in chaos analog encoding scheme,
Can be suitable for the transmission of video images technology of Gaussian Profile, with very strong practicality.
Brief description of the drawings
Fig. 1 utilizes transmission schematic diagram of the inventive method under Gaussian channel for the DCT coefficient of original video sequence；
Fig. 2 is the functional image of traditional Tent map chaotically codings；
Fig. 3 is the functional image of traditional Mod map chaotically codings；
Fig. 4 is the image of chaotic maps function proposed by the invention；
Fig. 5 is the MSE performance schematic diagrames for being uniformly distributed information source under three chaotic maps functions；
Fig. 6 is MSE performance schematic diagram of the DCT coefficient of natural image under three chaotic maps functions.
Marked in figure：1st, chaotic encoder, 2, power distribution, 3, LLSE decoders, 4, chaos decoder.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
In order to which analog encoding is applied in image/video transmission, a kind of Constructing Chaotic Code structure for wireless video transmission is proposed
Method is made, a kind of chaotic maps function for generalized Gaussian distribution or the information source of laplacian distribution is specifically constructed, it is intended to
Using this chaotic maps function, realize for keeping linear relationship from small to the signal of medium value, and big signal is in mapping letter
It will be folded back under several nonlinear characteristics.Therefore, for the input signal of class Gauss, the output of coding still keeps similar substantially
Statistical property；Compared with input power, power output is increased slightly.The statistics that the chaotic maps function considers signal source is special
The mutual equilibrium relation of power between property, the error correcting capability of mapping function, primary signal and checking symbol.What is proposed is used for nothing
The chaos code constructing method of line transmission of video, comprises the following steps：
S1, set up class Gaussian Profile information source：
S11, original video sequence is divided into multiple GOP；
S12, the DCT coefficient matrix for seeking each GOP：3-dimensional dct transform is carried out respectively to each GOP of division, DCT is obtained
Coefficient matrix SL×W×G, wherein, L is height of the video sequence per two field picture, and W is width of the video sequence per two field picture, and G is one
The frame number of video sequence in individual GOP；
S13, by DCT coefficient matrix conversion be the first real number symbol sebolic addressing：By DCT coefficient matrix SL×W×GIn element press
Row takes out successively, then connects be arranged as the first real number symbol sebolic addressing s={ s [i], i=0,1 ..., L × W × G- of single file successively
1}。
S2, step S1 the first real number symbol sebolic addressing s is mapped as by the second real number by the chaotic maps function of design accorded with
Number sequence, the formula of chaotic maps function is：
Functional image is as shown in figure 4, the second obtained real number symbol sebolic addressing x={ x (i), i=0,1 ..., L × W × G
× n-1 } represent, its length is m × n, wherein, m=L × W × G, n is bandwidth expansion factor, and corresponding code check is 1/n；
S3, the second real number symbol sebolic addressing obtained to step S2 carry out power distribution：
S31, the second real number symbol sebolic addressing is recompiled, be converted into the real number matrix X of two dimensionchunk_num×chunk_size, its
In, chunk_num represents the block number in a GOP, and chunk_size represents block interior element number, this also means that, matrix
Xchunk_num×chunk_sizeIn often row represent that combination proximity space DCT block assembly and they all parity check symbols exist
Together, each chunk shares identical power-scaling factors；
S32, use pjJ-th piece of corresponding power, p are distributed in expressionjCalculation formula be：
Wherein, gjThe power-scaling factors of j-th piece of expression, are to be used to minimize mean square error under power-limited condition
Estimation, λjJ-th piece of variance before expression analog encoding,Calculation formula be：
Wherein, P represents general power, λj' represent to have done j-th piece of the variance extended after analog encoding, it is to be based on this
The DCT components of individual block and their encoded parity symbols in this block are calculated, j=0,1 ..., chunk_num-1.
Fig. 1 show transmission schematic diagram of the DCT coefficient of original video sequence of the present invention under Gaussian channel, DCT coefficient
Matrix carries out power distribution 2 after the coding of chaotic encoder 1, and the signal that receiving terminal is received addition of additive white Gaussian noise
(AWGN), after linear minimum mean square estimation LLSE decoders 3, then the decoding of process chaos decoder 4 obtains original video sequence
Row.The correctness and validity to the chaotic maps function of construction are verified below, estimate (MSE) to evaluate with mean square error
Systematic function.
The symbol stream of reception is represented with z={ z [i], i=0,1 ..., m × n-1 }, its calculation formula is：
Z [i]=gi×x[i]+w′[i]
Wherein, i=0,1 ..., m × n-1,W [i] is that average is 0 and varianceChannel make an uproar
Sound.
Receiving end signal obtains y [i] after LLSE is decoded, and can be rewritten as in the form of scalar：
The MSE finished in receiving terminal after LLSE decodings can be expressed as：
Wherein,Represent the variance of interchannel noise.
By the chaotic maps function of proposition and current state-of-the-art two chaotic maps function Tent map and Mod map letters
Number compares, and its functional image difference is as shown in Figures 2 and 3.For the sake of justice, the analog encoding of all three mapping functions is set
Symbol has identical mean power, and compares the MSE after their map decodings.Because the performance of chaotic maps function is to input
The probability distribution of information source is quite sensitive, thus assess be uniformly distributed with both information sources of the DCT coefficient of natural image, they
MSE performances are distinguished as shown in Figure 5 and Figure 6, wherein each figure compares the chaotic maps function Tent (Tent that encoding rate is 1/2
Half), chaotic maps function Mod (Mod Half), the chaotic maps function (Proposed Half) of proposition and encoding rate are 1/
3 chaotic maps function Tent (Tent Third), chaotic maps function Mod (Mod Third), the chaotic maps function proposed
The performance of (Proposed Third).
Fig. 5 show the MSE performances for being uniformly distributed information source under three chaotic maps functions.Because gain is mainly by dividing
The slope of section linear function is obtained, therefore the overall performance of all three chaotic maps functions is approached.In high s/n ratio, 1/3
The analog encoding of code check is better than 1/2 code check analog encoding, but they are similar in low signal-to-noise ratio.
Fig. 6 is MSE performance of the DCT coefficient of natural image under three chaotic maps functions, no matter in 1/3 code check or
The analog encoding of 1/2 code check, the MSE performances for the chaotic maps function that the application is proposed will be better than other two chaotic maps letters
Number.
S and x mean power uses Ps and P respectivelyxRepresent, use Ps/PxRepresent power penalty coefficient, PsCalculating with Px is public
Formula is respectively：
Power penalty coefficient Ps/PxIt is not only relevant with chaotic maps function, it is relevant also with the distribution of analog signal.Assess
During the power punishment for four chaotic maps functions that Tent map, Mod map, Baker ' s map and the application are proposed, use respectively
The information sources of three kinds of different distributions, as shown in table 1.For equally distributed source, all four chaotic functions are all no power
Punishment.For the information source of Gaussian Profile, the power that the chaotic maps function that the application is proposed has 3.6dB is punished, and other three
Mapping function generates 5.5~8.5dB power punishment respectively." DCT systems in GGD or laplacian distribution information source, i.e. table
The difference then highly significant of number ", the mapping function proposed only only has 1dB power punishment, and other three mapping functions
The power punishment more than 40dB can then be produced.
The power penalty coefficient of the different chaos mapping functions of table 1
| Chaotic function | It is uniformly distributed | Gaussian Profile | DCT coefficient |
| Tent map | 0.0 | 5.5 | 42 |
| Mod map | 0.0 | 8.5 | 45 |
| Baker’s map | 0.0 | 5.5 | 42 |
| Proposed map | 0.0 | 3.6 | 1 |
Validity and superiority of the application compared to other method are understood by comparing, no matter in high s/n ratio or low
Under the conditions of signal to noise ratio, with the application chaos code constructing method, the signal MSE mass of receiving terminal is all higher than other two kinds of chaos letters
Number Tent map and Mod map.Meanwhile, using the Wireless video transmission method based on analog encoding, overcome conventional wireless and regard
Keep pouring in it is defeated in cliff effect, realize when video is transmitted in wireless channel as variations can reach continuously
Picture quality decays, while the video of receiving terminal can also reach high-quality reconstruction.
Claims (6)
1. a kind of chaos code constructing method for wireless video transmission, it is characterised in that comprise the following steps：
S1, original video sequence is divided into multiple GOP, each GOP DCT coefficient matrix obtained, by the DCT coefficient matrix
Be converted to the first real number symbol sebolic addressing s；
S2, the first real number symbol sebolic addressing s described in step S1 is mapped as by the second real number symbol by the chaotic maps function of design
Sequence, the formula of the chaotic maps function is：
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S3, the second real number symbol sebolic addressing obtained to step S2 carry out power distribution.
2. a kind of chaos code constructing method for wireless video transmission according to claim 1, it is characterised in that described
The process that each GOP DCT coefficient matrix is obtained in step S1 is specifically included：3-dimensional DCT is carried out respectively to each GOP of division
Conversion, obtains DCT coefficient matrix SL×W×G, wherein, L is height of the video sequence per two field picture, and W is video sequence per two field picture
Width, G is the frame number of video sequence in a GOP.
3. a kind of chaos code constructing method for wireless video transmission according to claim 2, it is characterised in that described
The DCT coefficient matrix conversion is specifically included for the first real number symbol sebolic addressing in step S1：By DCT coefficient matrix SL×W×GIn
Element taken out successively by row, then connect be arranged as the first real number symbol sebolic addressing s={ s [i], i=0,1 ..., L of single file successively
×W×G-1}。
4. a kind of chaos code constructing method for wireless video transmission according to claim 2, it is characterised in that described
The second real number symbol sebolic addressing x={ x (i), i=0,1 ..., L × W × G × n-1 } that step S2 is obtained represents that its length is m
× n, wherein, m=L × W × G, n is bandwidth expansion factor.
5. a kind of chaos code constructing method for wireless video transmission according to claim 1, it is characterised in that described
Step S3 is specifically included：
S31, the second real number symbol sebolic addressing is recompiled, be converted into the real number matrix X of two dimensionchunk_num×chunk_size, its
In, chunk_num represents the block number in a GOP, and chunk_size represents block interior element number；
S32, use pjJ-th piece of power, p are distributed in expressionjCalculation formula be：
<mrow>
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Wherein, gjThe power-scaling factors of j-th piece of expression, λjRepresent j-th piece of variance before analog encoding.
6. a kind of chaos code constructing method for wireless video transmission according to claim 5, it is characterised in that described
In step S32Calculation formula be：
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</mrow>
</mfrac>
</mrow>
Wherein, P represents general power, λ 'jJ-th piece of the variance extended after expression process analog encoding, j=0,1 ...,
chunk_num-1。
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