CN105306950B - A kind of video compress distance transmission system for feeding back coarse quantization reconstructed frame - Google Patents
A kind of video compress distance transmission system for feeding back coarse quantization reconstructed frame Download PDFInfo
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Abstract
The invention discloses a kind of video compress distance transmission systems for feeding back coarse quantization reconstructed frame, including information source and the stay of two nights, information source includes information source video encoder, positive transmission transmitter and reverse feedback receiver, and forward direction transmission transmitter and reverse feedback receiver are connected with information source video encoder；The stay of two nights includes stay of two nights Video Decoder, positive transmission receiver and reverse feedback transmitter, and forward direction transmission receiver and reverse feedback transmitter are connected with stay of two nights Video Decoder；Forward direction transmission transmitter is connected with forward direction transmission receiver, and reverse feedback transmitter is connected with reverse feedback receiver.The reconstruction video frame information of fed remote Video Decoder on the reverse channel of the invention makes local decoder reconstructed frame and long-distance video decoder in local video encoder rebuild frame synchronization；The coarse quantization of easy reduction transmitted data rates, reconstructed frame are fed back the data rate that needs are reduced using the method for coarse quantization, reduce the requirement to decoder operation speed.
Description
Technical field
The present invention relates to the technical fields of video compress Transmission system, and in particular to it is a kind of using long-distance video decoder to
The method that local video condensing encoder feeds back coarse quantization reconstructed frame, to improve the subjectivity of remote decoder video sequence and objective matter
Amount, while the video pressure of the feedback coarse quantization reconstructed frame of the anti-channel disturbance ability of video compress distance transmission system can also be enhanced
Contracting distance transmission system.
Background technology
Video communication is carried out in the channel in Bandwidth-Constrained and being easily disturbed, needs that there is stronger anti-error code capacity simultaneously
And high compression performance.In order to obtain high compression ratio, existing most of Video Codecs employ inter-prediction motion compensation
Scheme come effectively reduce time redundancy, then by spatial alternation reduce spatial redundancy, finally to result parameter progress entropy volume
Code, with the data volume of code stream after further reduction compression.Using this technology video standard include ITU H.261, MPEG-4,
H.263 and ITU H.26L/H.264 standards etc. ITU.
In these video standards, video compression encoding algorithm mainly includes 3 parts：Motion prediction, block transformation and amount
Change.One video frame may be used both of which and carry out compressed encoding, and one kind is intraframe coding, encode original video frame；It is another
Kind is interframe encode, encodes the motion compensated residual of decoded frame.Intraframe coding be mainly used for Video coding initial period and
At the time of great change has occurred in video scene.In each mode, all it is the block that divides a frame into multiple 8*8 sizes, 4
A adjacent brightness block and two color difference blocks can synthesize a macro block.In the discrete cosine transform to motion-prediction residual（DCT）
After coefficient is quantified, a local decoder is contained in local video condensing encoder, this local decoder and remote
The Video Decoder of journey is identical, it assures that in next motion-estimation step, coding and decoding video is using regarding after rebuilding
Frequency image carries out motion compensation, so as to avoid local video compressed encoding end using original predictive frame and long-distance video decoding end
Using reconstructed frame predict caused by two kinds of asynchronous operation problems.If local decoder and long-distance video decoder be not using
With reconstructed frame, decoded motion compensated residual can cause a deviation at decoder, it will the phenomenon that further resulting in error code diffusion,
It causes occur the phenomenon that mosaic during video transmission reception in video image, when error code is serious, can influence to receive the suitable of video
It is smooth to play.Although the synchronous influence for video transmission quality of local decoder and reconstructed frame in long-distance video decoder is such
It is important, and in the channel of high bit-error, it is easier to there is the nonsynchronous phenomenon of local and remote reconstructed frame, however current
Video encoding standard is only merely that identical local and remote decoder method is taken to ensure the same of local and remote reconstructed frame
Step transmits video frame information using only from local video condensing encoder to the forward channel of long-distance video decoder, not sharp
Reconstructed frame feedback is carried out, therefore locally regard with from long-distance video decoder to the backward channel in local video condensing encoder direction
The asynchronous problem of local decoder reconstructed frame and long-distance video decoder reconstructed frame in frequency condensing encoder is more serious, directly
Influence the transmission quality of video compress remote transmission and anti-channel disturbance ability.
In Modern Communication System, the forward channel from encoder transmission machine to decoder receiver direction was both provided,
It provides from decoder receiver to the backward channel of encoder transmission machine.So-called symmetrical service is being supported, such as the communication of speech
In system, the capacity of forward and reverse channel can be in a basic balance, i.e., backward channel can reach the biography identical with forward channel
Defeated rate.It, can be according to the difference of uplink and downlink business in such as communication system of data service asymmetric traffic is supported
Demand adjusts the capacity ratio of forward channel and backward channel, it is considered that data service need larger downstream data rate and
Smaller upstream data rate.
Traditional video traffic generally requires larger forward channel capacity, i.e., communication hub node is to being distributed in
User in system issues video information, generally transmits a small amount of feedback control information on backward channel, usually idle, do not have
It is fully used.Particularly when communication network supports a variety of multimedia services, the actual number of backward channel and forward channel
Very big according to transmission rate difference, idle backward channel causes the waste of the resources such as telecommunication system resources and frequency.
Invention content
In order to solve caused by preventing when the local decoder reconstructed frame and asynchronous long-distance video decoder reconstructed frame accidentally
The problem of code diffusion and decoded video quality decline, the present invention provides a kind of video compress for feeding back coarse quantization reconstructed frame is long-range
The reconstruction video frame information of Transmission system, on the reverse channel fed remote Video Decoder, so that local video compressed encoding
Local decoder reconstructed frame and long-distance video decoder in device rebuild frame synchronization；Utilize easy reduction transmitted data rates
Coarse quantization, reconstructed frame are fed back the data rate that needs are reduced using the method for coarse quantization, reduced to decoder operation speed
Requirement.
In order to achieve the above object, the technical scheme is that：A kind of video compress for feeding back coarse quantization reconstructed frame is remote
Journey Transmission system, including local information source and the long-range stay of two nights, the information source includes information source video encoder, positive transmission is sent
Device and reverse feedback receiver, forward direction transmission transmitter and reverse feedback receiver are connected with information source video encoder；Institute
It states the stay of two nights and includes stay of two nights Video Decoder, positive transmission receiver and reverse feedback transmitter, forward direction transmission receiver and reversely
Feedback transmitter is connected with stay of two nights Video Decoder；The positive transmission transmitter is connected with forward direction transmission receiver,
Reverse feedback transmitter is connected with reverse feedback receiver.
The information source video compression encoder includes coding mode selector, intra encoder, Video Composition between intra frame
Encoder, motion compensator, discrete cosine transformer, quantizer, local decoder and feedback rebuild frame decoder；In the frame
Interframe encoding mode selector is connected with video input, intra encoder, the motion compensator coding mode between intra frame
Selector is connected, and motion compensator is connected with discrete cosine transformer, and discrete cosine transformer is connected with quantizer, frame
Inner encoder, motion compensator and quantizer are connected with Video Composition encoder, and Video Composition encoder is transmitted with positive
Transmitter is connected；The local decoder input terminal rebuilds frame decoder with feedback respectively, quantizer is connected, local to decode
Device output terminal is connected with motion compensator.
The local decoder includes information source inverse DCT, information source inverse discrete cosine transformation device and local reconstructed frame, information source
Inverse DCT is connected with quantizer, and information source inverse discrete cosine transformation device is connected with information source inverse DCT, more than information source inverse discrete
String transducer rebuilds frame decoder with feedback and is added output to local reconstruction frame buffer, local to rebuild frame buffer and movement benefit
Device is repaid to be connected.
The stay of two nights Video Decoder is anti-including video decomposition decoder, video sequence follower, intraframe decoder device, the stay of two nights
Coarse quantization encoder in quantizer, stay of two nights inverse discrete cosine transformation device, inverse motion compensator and feedback frame；The video decomposes solution
Code device is connected with positive transmission receiver, video decompose decoder respectively with intraframe decoder device, stay of two nights inverse DCT, inverse move
Compensator is connected, and stay of two nights inverse DCT is connected with stay of two nights inverse discrete cosine transformation device, stay of two nights inverse discrete cosine transformation device with
Inverse motion compensator is connected, and intraframe decoder device and inverse motion compensator are connected with video sequence follower, video sequence
Follower is connected respectively with coarse quantization encoder in inverse motion compensator, feedback frame, in feedback frame coarse quantization encoder with it is anti-
It is connected to feedback transmitter.
The video frame being combined into is fed back to coarse quantization encoder in feedback frame by the video sequence follower, in feedback frame
Coarse quantization encoder determines the output data rate of oneself according to the instant capacity of backward channel, coarse quantization encoder in feedback frame
The feedback frame information of coarse quantization is sent to by reverse feedback transmitter on backward channel, reverse feedback receiver receives reversed
The feedback frame of feedback transmitter transmission is simultaneously sent to the reconstruction frame decoder of the feedback in video compression encoder, feeds back reconstructed frame solution
The feedback reconstructed frame of code device output and motion compensated residual and as prediction the sheet of information source inverse discrete cosine transformation device output
Ground reconstructed frame, is sent to local reconstruction frame buffer, and local frame buffer of rebuilding exports local reconstructed frame to motion compensator.
The beneficial effects of the invention are as follows：Using from long-range stay of two nights Video Decoder to local information source video encoder
Backward channel rebuilds frame information in local video compression encoder by long-range stay of two nights Video Decoder feedback coarse quantization
Local decoder, refresh local decoder in local reconstructed frame, by transmitting fed remote video solution on the reverse channel
The reconstruction frame information of code device, so that the local decoder reconstructed frame and long-distance video decoding in local video condensing encoder are thought highly of
Frame synchronization is built, idle backward channel capacity can be made full use of to improve the quality of transmission of video and the ability of anti-channel disturbance,
And the forward channel capacity of entire communication system is not influenced；Using the coarse quantization of easy reduction transmitted data rates, rebuild
Frame feeds back the data rate that needs are reduced using the method for coarse quantization, reduces the requirement to decoder operation speed.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the general principles schematic diagram of the present invention.
Fig. 2 is the concrete structure schematic diagram of information source video encoder in Fig. 1.
Fig. 3 is the concrete structure schematic diagram of stay of two nights Video Decoder in Fig. 1.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of not making the creative labor
Embodiment shall fall within the protection scope of the present invention.
A kind of video compress distance transmission system for feeding back coarse quantization reconstructed frame, as shown in Figure 1, including local information source
100 and the long-range stay of two nights 110.Wherein, information source 100 includes information source video encoder 101, forward direction transmits transmitter 102 and reversed
Feed back receiver 103, forward direction transmission transmitter 102 and reverse feedback receiver 103 are connected with information source video encoder 101
It connects.The stay of two nights 110 includes stay of two nights Video Decoder 111, positive transmission receiver 112 and reverse feedback transmitter 113, forward direction transmission
Receiver 112 and reverse feedback transmitter 113 are connected with stay of two nights Video Decoder 111.Forward direction transmission transmitter 102 with just
It is connected to transmission receiver 112, reverse feedback transmitter 113 is connected with reverse feedback receiver 103.
Information source video encoder 101 is responsible for, by video image compression coding, providing compression ratio as high as possible, with mitigation pair
The demand of forward channel bandwidth.Forward direction transmission transmitter 102 is responsible for the video image exported to information source video compression encoder 101
Compressed bit stream carries out Channel Coding and Modulation, and the positive transmission that the long-range stay of two nights 110 is then sent to by positive transmission channel connects
Receive device 112.Forward direction transmission receiver 112 is responsible for receiving the video for being superimposed noise and interference pollution by forward channel transmission
Picture signal, and the video signal received is demodulated and is decoded with channel, the decoded video of channel, image are believed
Breath is supplied to stay of two nights Video Decoder 111.On the one hand stay of two nights Video Decoder 111 is responsible for that positive transmission receiver will be received
112 compression video information decompression, recovers original video content, due to meeting superimposed noise and interference in positive transmission channel
Pollution, therefore the video content recovered is compared with original video content and has a degree of distortion；On the other hand, the stay of two nights regards
The reconstruction frame information that the decoding video frame recovered is converted into coarse quantization by frequency decoder 111 is supplied to reverse feedback transmitter
113, to be fed back to the reverse feedback receiver 103 of information source 100.Reverse feedback transmitter 113 is responsible for reconstructed frame to be feedback
Information carries out Channel Coding and Modulation, and the reverse feedback receiver 103 of information source 100 is then sent to by reverse feedback channels.Instead
It is responsible for rebuilding that frame signal is demodulated and channel is decoded to receiving feedback to feed back receiver 103, channel is decoded anti-
Feedback rebuilds frame information and information source video encoder 101 is supplied to use.The present invention using from long-range stay of two nights Video Decoder 111 to
The backward channel of local information source video encoder 101 is fed back the reconstructed frame of coarse quantization by long-range stay of two nights Video Decoder 111
Information refreshes local reconstructed frame in the video compression encoder 111 of local.
As shown in Fig. 2, information source video compression encoder 101 includes coding mode selector 202, intraframe coding between intra frame
Device 203, Video Composition encoder 207, motion compensator 204, discrete cosine transformer 205, quantizer 206, local decoder
210 rebuild frame decoder 208 with feedback.Coding mode selector 202 is connected with video input 201 between intra frame, is compiled in frame
Code device 203, the coding mode selector 202 between intra frame of motion compensator 204 are connected, motion compensator 204 with it is discrete
Cosine transformer 205 is connected, and discrete cosine transformer 205 is connected with quantizer 206, intra encoder 203, motion compensation
Device 204 and quantizer 206 are connected with Video Composition encoder 207, Video Composition encoder 207 and positive transmission transmitter
102 are connected.210 input terminal of local decoder rebuilds frame decoder 208 with feedback respectively, quantizer 206 is connected, local to solve
Code 210 output terminal of device is connected with motion compensator 204.
Error code expands caused by order to prevent when the local decoder reconstructed frame and asynchronous long-distance video decoder reconstructed frame
It dissipates and decoded video quality declines, the reconstruction video of the stay of two nights Video Decoder 111 of fed remote on the reverse channel of the invention
Frame information, so that 210 reconstructed frame of local decoder and stay of two nights Video Decoder 111 in local information source video encoder 101
Rebuild frame synchronization.It, need to but if according to the decompressed reconstruction video frame of Rate Feedback needed for traditional vision signal
Backward channel capacity that will be very big or even the permission capacity far beyond backward channel, it is therefore necessary to take measures to reduce feedback
The data rate of reconstructed frame, in other words it needs to be determined that reasonably feeding back the data rate of reconstructed frame.Due to information source video encoder
101 are required for using intra-frame encoding mode, and this pattern often needs transmission one individually thick in the starting stage of communication
The intraframe coding of quantization rebuilds frame buffer zone to supplement；When acute variation has occurred in video scene, it is also desirable to be switched in frame and compile
Pattern is updated with coarse quantization coded frame rebuilds frame buffer zone.According to rational uplink and downlink channel speed balance it is assumed that in frame
Transmission rate during coding mode may be considered backward channel can be used for carry out reconstructed frame feedback data rate namely
Backward channel allows capacity, this capacity is more much lower than the data rate of original video frame, therefore reconstructed frame feedback is using thick
The method of quantization encoding reduces the data rate of needs, while coarse quantization is a kind of reduction transmitted data rates side of simplicity
Method also reduces the requirement of the arithmetic speed to stay of two nights Video Decoder 111.
Specifically, video input 201 provide it is unpressed, need the video source transmitted, the video source information can be but
It is not limited to QCIF forms, CIF forms, 4CIF forms or 16CIF forms etc..Coding mode selector 202 provides between intra frame
The decision encoded using intraframe coding or inter motion compensation, decision rule can be that initial frame or video scene generation are larger
During change, using intraframe coding；Whether can either be met according to the block quality after intraframe coding and inter motion compensation coding
It is required that.It is blocking that intra encoder 203 will need the initial frame for carrying out intraframe coding to divide, and then every piece of average value is carried out slightly
Quantization.Specifically, it can be 16 grades by each piece of mean quantization, such quantization will be between absolute pixel values 52~228 etc.
It is spaced apart.Block size determines according to frame target bit rate, i.e.,：Frame target bit rate=intra block number × 4.Motion compensator
204 are mainly used for removing inter frame temporal redundancy, specifically, can by block of pixels of the image frame arrangement into 2 × 2~16 × 16, when
When positioning the specific location of block of pixels, the neighboring area of corresponding position is chosen in previous reconstructed frame as region of search, specifically
Mean square deviation or mean absolute difference distance metric can be used in ground, can also use pixel difference class standard, determine corresponding blocks
Motion vector obtains the predicted value of current block by appropriate motion translation, is then subtracted from present encoding block according to reconstruction
The current block of block prediction is worth to motion compensated residual.Motion vector is exported and gives Video Composition encoder by motion compensator 204
207, motion compensated residual is exported to discrete cosine transformer 205.Discrete cosine transformer 205 is defeated to motion compensator 204
The motion compensated residual gone out carries out discrete cosine transform, exports discrete cosine transform coefficient to quantizer 206.Quantizer 206 is right
The discrete cosine transform coefficient that discrete cosine transformer 205 exports carries out optimal quantization.Video Composition encoder 207 will be compiled in frame
The discrete cosine transform coefficient optimised quantity of inter motion compensation residual error that the intraframe coding of the code output of device 203, quantizer 206 export
The motion vector that change value and motion compensator 204 export synthesizes a serial compressed video bitstream, is sent out by forward direction transmission
Device 102 is sent to be sent in forward channel.
Coding mode selector 202, intra encoder 203, Video Composition encoder 207 form between intra frame in the present invention
Intra-frame encoding mode.Coding mode selector 202, motion compensator 204, discrete cosine transformer 205, quantizer between intra frame
206 and Video Composition encoder 207 form interframe encoding mode.The specific practice that coarse quantization encodes in frame is intra encoder
203 divide the frame into block, then carry out coarse quantization to every piece of average value.Correspondingly, when feeding back reconstructed frame on the reverse channel,
Also it is at long-range stay of two nights Video Decoder 111 that the division of entire reconstructed frame is blocking, then every piece of average value is slightly measured
Change, then the reconstructed frame after coarse quantization is fed back to the local decoding at local 101 end of information source video encoder by backward channel
In device 210, update in the local reconstruction frame buffer 2103 in the local decoder 210 of local information source video encoder 101
Local reconstructed frame.The local local reconstructed frame rebuild in frame buffer 2103 in local decoder 210 is by feedback reconstructed frame
Influence degree can be adjusted as needed.
Local decoder 210 includes information source inverse DCT 2101, information source inverse discrete cosine transformation device 2102 and local reconstruction
Frame buffer 2103, information source inverse DCT 2101 are connected with quantizer 206, information source inverse discrete cosine transformation device 2102 and information source
Inverse DCT 2101 is connected, and information source inverse discrete cosine transformation device 2102 and feedback rebuild the conveying of 208 sum of frame decoder
Frame buffer 2103 is rebuild to local, local frame buffer 2103 of rebuilding is connected with motion compensator 204.Feed back reconstructed frame solution
Code device 208 from long-range stay of two nights Video Decoder 111 by reverse feedback receiver 103 feed back come reconstruction frame information it is anti-thick
Quantization decoder reverts to the data format of video image frame.Local decoder 210 is ensured in next motion compensation step
In, encoding and decoding carry out motion compensation using the image after rebuilding, and so as to which coding side be avoided to use primitive frame, and decoding end uses
Two kinds of asynchronous operation problems caused by reconstructed frame prediction.
The discrete cosine transform coefficient quantized value for the motion compensated residual that information source inverse DCT 2101 exports quantizer 206
Inverse is melted into the discrete cosine transform coefficient value of motion compensated residual.Information source inverse discrete cosine transformation device 2102 is by information source inverse quantization
The discrete cosine transform coefficient value for the motion compensated residual that device 2101 exports carries out inverse discrete cosine transformation, exports as unit of frame
Motion compensated residual.The input of local reconstruction frame buffer 2103 is the movement that information source inverse discrete cosine transformation device 2102 exports
The sum that residual sum feedback rebuilds the feedback reconstructed frame that frame decoder 208 exports is compensated, output is the local reconstructed frame of prediction,
It maintains synchronous with long-range 111 reconstructed frame of stay of two nights Video Decoder.
Motion compensator 204 is the difference of the present frame for calculating its input and the prediction frame of the output of local decoder 210, i.e.,
Motion compensated residual, and calculate motion vector.Motion compensator 204 gives information source discrete cosine transformer motion compensated residual
205, Video Composition encoder 207 is given motion vector after quantization, actually motion compensated residual is only plus motion vector
The difference of notional present frame and previous frame.The first frame of video is encoded using intra encoder, so complete coding regards
Frequency stream includes the coding of first frame（It is exported by intra encoder 203）, follow-up every two interframe difference（Including motion vector and fortune
Dynamic compensation residual error）, so Video Composition encoder 207 collects three tunnels：The intra encoder output of the first frame of coding, motion compensator
The motion compensated residual of motion vector and the discrete cosine transformer output of output.
Stay of two nights Video Decoder 111 includes video and decomposes decoder 301, video sequence follower 302, intraframe decoder device
303rd, coarse quantization is compiled in stay of two nights inverse DCT 304, stay of two nights inverse discrete cosine transformation device 305, inverse motion compensator 306 and feedback frame
Code device 307.Video decomposes decoder 301 and is connected with positive transmission receiver 112, video decomposition decoder 301 respectively with frame
Inner demoder 303, stay of two nights inverse DCT 304, inverse motion compensator 306 are connected, stay of two nights inverse DCT 304 and stay of two nights inverse discrete
Cosine transformer 305 is connected, and stay of two nights inverse discrete cosine transformation device 305 is connected with inverse motion compensator 306, intraframe decoder device
303 and inverse motion compensator 306 be connected with video sequence follower 302, video sequence follower 302 respectively with inverse movement
Coarse quantization encoder 307 is connected in compensator 306, feedback frame, and coarse quantization encoder 307 is sent with reverse feedback in feedback frame
Device 113 is connected.
What the information source video encoder 101 that forward direction transmission receiver 112 is received from forward channel was sent has been superimposed channel
Noise and the compressed video signal of interference pollution, are demodulated and are decoded with channel, will be extensive after removing interchannel noise and interference as possible
The compressed video bit stream appeared again sends video to and decomposes decoder 301, and video decomposes decoder 301 from the video code flow received
In decomposite the discrete cosine transform system of coarse quantization coding information, motion compensation vector information and inter motion compensation residual error in frame
Several quantitative informations sends coarse quantization coding information in frame to intraframe decoder device 303, by inter motion compensation residual error respectively
The quantitative information of discrete cosine transform coefficient sends stay of two nights inverse DCT 304 to, sends motion compensation vector information to inverse fortune
Dynamic compensator 306.Intraframe decoder device 303 will send video sequence follower 302 to after the coarse quantization information decoding in frame；The stay of two nights
The quantized value of the discrete cosine transform coefficient of inter motion compensation residual error is carried out inverse quantization processing by inverse DCT 304, by inverse
The discrete cosine transform coefficient of inter motion compensation residual error after change is transmitted to stay of two nights inverse discrete cosine transformation device 305, and the stay of two nights is anti-
Discrete cosine transformer 305 exports interframe motion compensated residual to inverse motion compensator 306.Inverse motion compensator 306, which utilizes, to be regarded
Frequency sequence follower 302 export decoded video image frame and video decompose decoder 301 export motion compensation vector,
The video image frame that the inter motion compensation Residual Generation that stay of two nights inverse discrete cosine transformation device 305 exports is rebuild, is supplied to video
Sequence follower 302.The intracoded frame and inverse motion compensator that video sequence follower 302 exports intraframe decoder device 303
The inter-frame encoding frame of 306 outputs is combined into complete video flowing.Meanwhile 302 video frame being combined into of video sequence follower
Coarse quantization encoder 307 in feedback frame is fed back to, coarse quantization encoder 307 is determined according to the instant capacity of backward channel in feedback frame
Determine the output data rate of oneself, the feedback frame information of coarse quantization is passed through reverse feedback by coarse quantization encoder 307 in feedback frame
Transmitter 113 is sent on backward channel, and the feedback reconstruction frame decoder 208 allowed in video compression encoder receives.It is reversely anti-
Feedback receiver 103 receives the feedback frame that reverse feedback transmitter 113 is sent and the feedback being sent in video compression encoder 101
Frame decoder 208 is rebuild, feedback rebuilds feedback reconstructed frame and the information source inverse discrete cosine transformation device 2102 that frame decoder 208 exports
The motion compensated residual of output and be conveyed to it is local rebuild frame buffer 2103, as the local reconstructed frame of prediction, be sent to
Motion compensator 204.
Three tunnels that video decomposer 301 decomposes are respectively：Coding, motion vector and the motion compensated residual of first frame.First frame
Coding give intra encoder 303 and handle, i.e., anti-coarse quantization；Motion compensated residual give stay of two nights inverse DCT 304 this all the way
Processing；Inverse motion compensator 306 is merged into motion vector and motion compensated residual the difference of adjacent two interframe, along with video
The present frame that sequence follower 302 exports, the next frame for being calculated as prediction give video sequence follower 302.Video sequence is defeated
Go out device 302 first frames and subsequent frame are connected in series output can into complete video flowing.
The present invention is using from long-range stay of two nights Video Decoder to anti-on the backward channel of local information source video encoder
The reconstruction frame information of coarse quantization is presented, local decoder reconstructed frame in local information source video compression encoder and long-range can be improved
The synchronization extent of reconstructed frame in stay of two nights Video Decoder, so as to reach preferable video long-distance transfer quality and improve video compress
The anti-channel disturbance ability of Transmission system.Available for providing wireline communication network, cordless communication network and multimedia communication network
It is middle to carry out real-time or non real-time video compress transmission, it can also support the video pressure of interactive and two-way full duplex mode
Contracting communication, can especially improve the video compress transmission quality in mobile multimedia communication network.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of video compress distance transmission system for feeding back coarse quantization reconstructed frame, including local information source（100）With it is long-range
The stay of two nights（110）, which is characterized in that the information source（100）Including information source video encoder（101）, positive transmission transmitter（102）
With reverse feedback receiver（103）, forward direction transmission transmitter（102）With reverse feedback receiver（103）Compiled with information source video
Code device（101）It is connected；The stay of two nights（110）Including stay of two nights Video Decoder（111）, positive transmission receiver（112）With it is anti-
To feedback transmitter（113）, forward direction transmission receiver（112）With reverse feedback transmitter（113）With stay of two nights Video Decoder
（111）It is connected；The positive transmission transmitter（102）Receiver is transmitted with forward direction（112）It is connected, reverse feedback transmitter
（113）With reverse feedback receiver（103）It is connected；
The stay of two nights Video Decoder（111）Decoder is decomposed including video（301）, video sequence follower（302）, solve in frame
Code device（303）, stay of two nights inverse DCT（304）, stay of two nights inverse discrete cosine transformation device（305）, inverse motion compensator（306）And feedback
Coarse quantization encoder in frame（307）；The video decomposes decoder（301）Receiver is transmitted with forward direction（112）It is connected, video
Decompose decoder（301）Respectively with intraframe decoder device（303）, stay of two nights inverse DCT（304）, inverse motion compensator（306）It is connected
It connects, stay of two nights inverse DCT（304）With stay of two nights inverse discrete cosine transformation device（305）It is connected, stay of two nights inverse discrete cosine transformation device
（305）With inverse motion compensator（306）It is connected, intraframe decoder device（303）With inverse motion compensator（306）And video sequence
Follower（302）It is connected, video sequence follower（302）Respectively with inverse motion compensator（306）, coarse quantization is compiled in feedback frame
Code device（307）It is connected, coarse quantization encoder in feedback frame（307）With reverse feedback transmitter（113）It is connected；
The video sequence follower（302）The video frame being combined into is fed back to coarse quantization encoder in feedback frame（307）, instead
Present coarse quantization encoder in frame（307）The output data rate of oneself is determined according to the instant capacity of backward channel, in feedback frame
Coarse quantization encoder（307）The feedback frame information of coarse quantization is passed through into reverse feedback transmitter（113）It is sent on backward channel,
Reverse feedback receiver（103）Receive reverse feedback transmitter（113）The feedback frame of transmission is simultaneously sent to information source video encoder
（101）In feedback rebuild frame decoder（208）, feedback reconstruction frame decoder（208）The feedback reconstructed frame of output is solved with local
Code device（210）Information source inverse discrete cosine transformation device（2102）Output motion compensated residual and give local as prediction
Decoder（210）Local rebuild frame buffer（2103）, it is local to rebuild frame buffer（2103）The local reconstructed frame transmission of output
To motion compensator（204）；
The information source video encoder（101）Including coding mode selector between intra frame（202）, intra encoder（203）, regard
Frequency composite encoder（207）, motion compensator（204）, discrete cosine transformer（205）, quantizer（206）, local decoder
（210）Frame decoder is rebuild with feedback（208）；Coding mode selector between the intra frame（202）With video input（201）Phase
Connection, intra encoder（203）, motion compensator（204）The coding mode selector between intra frame（202）It is connected, transports
Dynamic compensator（204）With discrete cosine transformer（205）It is connected, discrete cosine transformer（205）With quantizer（206）It is connected
It connects, intra encoder（203）, motion compensator（204）And quantizer（206）With Video Composition encoder（207）It is connected,
Video Composition encoder（207）Transmitter is transmitted with forward direction（102）It is connected；The local decoder（210）Input terminal is distinguished
Frame decoder is rebuild with feedback（208）, quantizer（206）It is connected, local decoder（210）Output terminal and motion compensator
（204）It is connected.
2. the video compress distance transmission system of the feedback coarse quantization reconstructed frame according to claim 1, which is characterized in that
The local decoder（210）Including information source inverse DCT（2101）, information source inverse discrete cosine transformation device（2102）With local weight
Build frame buffer（2103）, information source inverse DCT（2101）With quantizer（206）It is connected, information source inverse discrete cosine transformation device
（2102）With information source inverse DCT（2101）It is connected, information source inverse discrete cosine transformation device（2102）Frame decoder is rebuild with feedback
（208）It is added output and rebuilds frame buffer to local（2103）, it is local to rebuild frame buffer（2103）With motion compensator（204）
It is connected.
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