CN101237587A - A video sequence coding method and its error control system - Google Patents
A video sequence coding method and its error control system Download PDFInfo
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- CN101237587A CN101237587A CN 200710063541 CN200710063541A CN101237587A CN 101237587 A CN101237587 A CN 101237587A CN 200710063541 CN200710063541 CN 200710063541 CN 200710063541 A CN200710063541 A CN 200710063541A CN 101237587 A CN101237587 A CN 101237587A
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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
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
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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
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
Abstract
The invention discloses a coding method of a video sequence, used for error control in video transmission. The method comprises the following steps: step 1: the first frame image of a video sequence is coded in an intraframe coding mode; step 2: core reference frames are inserted into a plurality of positions behind the first frame image in the video sequence; the reference frame of each core reference frame is a previous I frame or a previous core reference frame; step 3: non-core reference frame images in the video sequence is coded according to a standard coding method; step 4: core reference frame images in the video sequence is coded in the intraframe coding mode. The coding method has higher coding efficiency and can effectively reduce or prevent the diffusion of transmission error in the video sequence, thereby improving the quality of video transmission.
Description
Technical field
The present invention relates to image information transmission and process field, be specifically related to the method for the prevention transmission error diffusion in carrying out the video transmission process.
Background technology
During by main communication network transmission of video such as Internet and wireless mobile network, existing video compression algorithm adopts the hybrid encoding frame based on motion compensation to improve compression ratio usually.For Motion Picture Experts Group's standard (MPEG) video flowing, adopt three types frame: intracoded frame (hereinafter to be referred as the I frame), forward-predictive-coded frames (hereinafter to be referred as the P frame) and bi-directional predictive coding frame (hereinafter to be referred as the B frame).The I frame is a full frame compressed coded frames, and it carries out compressed encoding and transmission with full frame image information, and the data of only using the I frame during decoding are with regard to the restructural complete image; The P frame can predict that the P frame belongs to the interframe encode of forward prediction by the P frame of I frame or front, and compression ratio is greater than the I frame; The B frame is that reference frame is predicted with the I of front or the P frame of P frame and back, so compression ratio is the highest.
Yet, need overcome the influence of transmission error satisfying under the bandwidth constraints.
Be illustrated in figure 1 as the processing method of traditional video coding mode to transmission error.In Fig. 1, adopt the image of intra-frame encoding mode independently to decode, other encoded image frame is taked interframe encoding mode.Being a kind of typical video coding code flow structure shown in Fig. 1, is intra-frame encoding mode in the t moment and t+n picture frame constantly wherein, is designated as I, and other picture frame is all taked to be designated as P with the interframe encoding mode of former frame as the reference frame.
When transmission error occurring, for example make a mistake constantly at t+i, then P (t+i) can not be correctly decoded.Since follow-up inter-frame encoding frame all be with former frame as the reference image, so the decoded in error image can spread backward, till t+n in-frame encoding picture frame constantly.In this case, the time interval of decoding error is n-i.
Transmission error causes that video image can not normal decoder, and error image information can spread on time domain and spatial domain.In order to reduce video transmission error and mistake diffusion influence thereof, a kind of method commonly used is to adopt the intraframe coding renewal technology, but intraframe coding method can reduce code efficiency significantly.
Compare with the intraframe coding renewal, (Reference Picture Selection RPS) has higher code efficiency to reference frame selection.To be encoder obtain the loss situation of decoder by feedback channel to its basic thought, selects for use the correct frame early that receives of decoded device as the reference frame when the next inter-frame encoding frame of coding.Hideaki Kimata and Yoshiyuki Yashima have proposed a kind of new nothing based on crucial reference frame and have fed back crucial reference frame selecting method in document " A study of key-frame referencepicture selection method for error resilient multiple video objects distribution ".Promptly with intracoded frame (I frame) as crucial reference frame, each P frame all with the I frame as the reference frame.Though this method can stop the diffusion of mistake effectively, insert key frame (I frame) too much, cause data volume excessive, code efficiency reduces.
Summary of the invention
Technical problem to be solved by this invention has been to provide a kind of coding/decoding method of video code flow, by in encoding code stream, inserting core reference frame, not only can reduce or stop the image quality decrease that causes owing to transmission error in the video process effectively, and can obviously not reduce the code efficiency of video image.
To achieve these goals, the invention provides a kind of coding method of video sequence, be used for the error control of video transmission, comprising:
Step 3 is encoded according to the coding method of standard to the non-core reference frame image in the video sequence;
Take the image of intraframe coding method independently to decode in the described step 1.
Insert core reference frame in the described step 2 and comprise every fixed intervals and insert core reference frame, or according to rate-distortion optimization Model Selection core reference frame, or insert core reference frame according to the affirmation information self-adapting that feedback channel is passed back.
Described image in the described step 3 is I frame, P frame or B frame.
The coding method of standard is an inter-frame encoding in the described step 3.
Described inter-frame encoding is to encode as the reference frame with the former frame of present frame.
In the described step 4 core reference frame image being taked the inter-frame encoding coding is to encode as the reference frame with the correct core reference frame of accepting before the present frame.
The present invention also provides a kind of error control method of video transmission, comprising:
Take intraframe coding method to encode to video sequence first two field picture;
Core reference frame is inserted in several positions after first two field picture in video sequence;
Non-core reference frame image in the video sequence is encoded according to the coding method of standard;
Core reference frame image in the video sequence is taked the inter-frame encoding coding;
The video sequence of received code is decoded and feedback decoding information then;
The video sequence of transfer encoding and the decoded information of feedback.
Described in video sequence after first two field picture several positions insert core reference frame steps and be included in the video sequence and insert core reference frame every fixed intervals, or according to rate-distortion optimization Model Selection core reference frame, or the affirmation Information Selection core reference frame of passing back according to feedback channel.
The coding method of described standard is for taking the inter-frame encoding coding.
Described inter-frame encoding takes former frame with present frame as the reference frame.
Described core reference frame image in the video sequence is taked in the inter-frame encoding coding step is to encode as the reference frame with the correct core reference frame that receives before the present frame.
The present invention also provides a kind of accuracy control system of video transmission, comprising:
Encoder, be used for taking intraframe coding method to encode to video sequence first two field picture, core reference frame are inserted in several positions after first two field picture in video sequence, and the non-core reference frame image in the video sequence is encoded according to the coding method of standard and the core reference frame image in the video sequence is taked the inter-frame encoding coding;
Decoder, the video sequence that is used for received code is decoded then, and the condition feedback of will decoding is to encoder;
Channel is used for the video sequence of: 1 transcoder coding and the information of feedback decoder decoding.
Described channel comprises: transmission channel is used for the video sequence that transfer encoding plays coding; Feedback channel is used for the information that feedback decoder is decoded.
Described encoder, decoder and channel life period postpone.
The present invention proposes a kind of core reference frame of passing through to insert, can under the condition of not obvious reduction video coding efficient, realize the method for controlling video transmission error.Compare with original method of in video sequence, inserting I frame or crucial reference frame, have higher code efficiency, and can effectively reduce or stop the diffusion of transmission error on video sequence, thereby improve the quality of video transmission.
Description of drawings
Figure 1 shows that the processing method of traditional video coding mode to transmission error;
Figure 2 shows that the processing method of core reference frame method to transmission error;
Figure 3 shows that the error control method of taking fixed intervals to insert core reference frame;
Figure 4 shows that self adaptation core reference frame error control method at interval.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In order when transmission error occur, to reduce or stop the diffusion of decoded in error image, the present invention proposes a kind of in coding method based on core reference frame, can be under the situation of not obvious reduction video coding efficient, stop wrong diffusion.Figure 2 shows that the processing method of core reference frame method to transmission error.
In the process of carrying out video coding, insert core reference frame at some ad-hoc location, be designated as C, shown in the two-wire among Fig. 2.Core reference frame also takes the interframe encode method to encode, and with common interframe encode method comparison, its difference is that its reference frame is the I frame or the core reference frame of front.For example in Fig. 2, C (t+j) is to be reference frame with I (t), and C (t+k) is to be reference frame with C (t+j).
When transmission error occurring, for example make a mistake constantly at t+i, then P (t+i) can not be correctly decoded.Since follow-up inter-frame encoding frame P (t+i+1) be with P (t+i) as with reference to image, so the decoded in error image can spread backward.
At t+j constantly and since core reference frame C (t+j) be with I (t) as with reference to frame, it doesn't matter with P (t+i) and P (t+i+1), so core reference frame C (t+j) can be correctly decoded.Transmission error does not take place in the picture frame for after the t+j, and image can both be correctly decoded.In this case, the time interval of decoding error is n-i-j.
Figure 3 shows that one illustrative embodiments takes fixed intervals to insert the method that core reference frame realizes transmission error control according to the present invention.
Video encoder carries out real-time coding to video sequence, obtains the encoded video code stream, shown in the first half among Fig. 3.Then the encoded video code stream is sent to Video Decoder and decodes, shown in the latter half among Fig. 3.
Because exist the regular hour to postpone in encoder or the Channel Transmission process, the moment that Video Decoder receives the encoded video code stream exists the regular hour poor with real video sequence.In like manner because Video Decoder and or the feedback channel transmission course exist the regular hour to postpone, Video Decoder feeds back to video encoder with the present image decoded information and also exists the regular hour to postpone.After hypothesis was carved encoder video sequence is encoded in Fig. 3, through Channel Transmission, decoded device received also decoding, the condition feedback of will decoding then to required time of encoder in 4 unit interval.Be t after constantly the decoded device of image encoded frame receives, t+4 constantly before encoder can obtain the feedback information of decoder.
The decoded state of the core reference frame of decoder end sends encoder to by feedback channel, and ACK represents that this picture frame can be correctly decoded, and NACK represents that this picture frame can not be correctly decoded.The picture frame that can be correctly decoded as I among Fig. 3 (t), C (t+4), C (t+12), C (t+16), C (t+20) etc. feeds back to encoder by ACK, and the C that can not be correctly decoded (t+8) feeds back to encoder by NACK.
At t constantly, encoder is encoded with intraframe coding method to first frame of video sequence, is designated as I (t).
At t+1 to t+3 constantly, encoder is taked to be designated as P (t+1), P (t+2), P (t+3) with the inter-frame encoding coding of former frame as the reference frame to present image.
At t+4 constantly, the I (t) that encoder has received decoder feedback is correctly decoded ACK information, takes the core reference frame mode to encode to present image, promptly encodes as the reference frame with I (t), is designated as C (t+4).
At t+5 to t+7 constantly, encoder is taked to be designated as P (t+5), P (t+6), P (t+7) with the inter-frame encoding coding of former frame as the reference frame to present image.
At t+8 constantly, the C (t+4) that encoder has received decoder feedback is correctly decoded ACK information, takes the core reference frame mode to encode to present image, promptly encodes as the reference frame with C (t+4), is designated as C (t+8).
At t+9 to t+11 constantly, encoder is taked to be designated as P (t+9), P (t+10), P (t+11) with the inter-frame encoding coding of former frame as the reference frame to present image.
At t+12 constantly, the C (t+8) that encoder does not receive decoder feedback is correctly decoded ACK information, but need take the core reference frame mode to encode to present image according to fixed intervals core reference frame method.So promptly encode as the reference frame, be designated as C (t+12) with the correct core reference frame C (t+4) that receives in front.
Coding method and front constantly, back is similar, no longer repeats at this.
The self adaptation that Figure 4 shows that another illustrative embodiments according to the present invention is inserted the method that core reference frame realizes transmission error control.Promptly when packet loss is low, take coding method between normal frames, when packet loss is higher, take the core reference frame method.
Video encoder carries out real-time coding to video sequence, obtains the encoded video code stream, shown in the first half among Fig. 4.Then the encoded video code stream is sent to Video Decoder and decodes, shown in the latter half among Fig. 4.
Because exist the regular hour to postpone in encoder or the Channel Transmission process, the moment that Video Decoder receives the encoded video code stream exists the regular hour poor with real video sequence.In like manner because Video Decoder and or the feedback channel transmission course exist the regular hour to postpone, Video Decoder feeds back to video encoder with the present image decoded information and also exists the regular hour to postpone.After hypothesis was carved encoder video sequence is encoded in Fig. 4, through Channel Transmission, decoded device received also decoding, the condition feedback of will decoding then to required time of encoder in 2 unit interval.Be t after constantly the decoded device of image encoded frame receives, t+2 constantly before encoder can obtain the feedback information of decoder.
The decoded state of the core reference frame of decoder end sends encoder to by feedback channel, and ACK represents that this picture frame can be correctly decoded, and NACK represents that this picture frame can not be correctly decoded.The picture frame that can be correctly decoded as I among Fig. 3 (t), C (t+5), C (t+10), C (t+15) etc. feeds back to encoder by ACK, and the P that can not be correctly decoded (t+6), C (t+8) feed back to encoder by NACK.
At t constantly, encoder is encoded with intraframe coding method to first frame of video sequence, is designated as I (t).
At t+1 to t+4 constantly, encoder is not received any nack message, and present image is taked to be designated as P (t+1), P (t+2), P (t+3), P (t+4) with the inter-frame encoding coding of former frame as the reference frame.
At t+5 constantly, encoder does not receive any nack message, shows that promptly packet loss is very low, should take with the inter-frame encoding coding of former frame as the reference frame present frame.But owing to do not specify core reference frame for a long time, the interval of present frame and correct core reference frame becomes far gradually, in case mistake takes place, needs with reference to correct core reference frame coding, and code efficiency will significantly reduce.In order to improve code efficiency, as shown in Figure 4, after 5 normal frames of every continuous programming code, no matter present frame is encoded with reference to that frame, present frame all is appointed as core reference frame.
At t+6 to t+7 constantly, encoder is not received any nack message, and present image is taked to be designated as P (t+6), P (t+7) with the inter-frame encoding coding of former frame as the reference frame.
At t+8 constantly, encoder receives nack message, and P (t+6) can not be correctly decoded.Take the core reference frame method to encode to present frame, promptly the correct core reference frame C (t+5) with nearest reception carries out interframe encode as the reference image, is designated as C (t+8).
At t+9 constantly, encoder is not received any nack message, and present image is taked to be designated as P (t+9) with the inter-frame encoding coding of former frame as the reference frame.
At t+10 constantly, encoder receives the decoder nack message, and C (t+8) can not be correctly decoded, and takes the core reference frame mode to encode to present image, promptly encode as the reference frame, be designated as C (t+10) with the previous core reference frame C that is correctly decoded (t+5).
At t+11 to t+14 constantly, encoder is not received any nack message, and present image is taked to be designated as P (t+11), P (t+12), P (t+13), P (t+14) with the inter-frame encoding coding of former frame as the reference frame.
At t+15 constantly, encoder does not receive any nack message, shows that promptly packet loss is very low, should take with the inter-frame encoding coding of former frame as the reference frame present frame.But in order to improve code efficiency, as shown in Figure 4, after 5 normal frames of every continuous programming code, no matter present frame is encoded with reference to that frame, present frame all is appointed as core reference frame, promptly carries out interframe encode with C (t+10) as the reference frame, is designated as C (t+15).
The coding method and the front in the follow-up moment are similar, no longer repeat at this.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (15)
1. coding method of video sequence is used for the error control of video transmission, it is characterized in that,
Comprise:
Step 1 takes intraframe coding method to encode to video sequence first two field picture;
Step 2, core reference frame is inserted in several positions after first two field picture in video sequence, and the reference frame of described core reference frame is I frame before or core reference frame before;
Step 3 is encoded according to the coding method of standard to the non-core reference frame image in the video sequence;
Step 4 is taked the inter-frame encoding coding to the core reference frame image in the video sequence.
2. coding method of video sequence according to claim 1 is characterized in that, takes the image of intraframe coding method independently to decode in the described step 1.
3. coding method of video sequence according to claim 1, it is characterized in that, inserting core reference frame in the described step 2 comprises every fixed intervals insertion core reference frame, or according to rate-distortion optimization Model Selection core reference frame, or the affirmation information self-adapting of passing back according to feedback channel inserts core reference frame.
4. coding method of video sequence according to claim 1 is characterized in that, the described image in the described step 3 is I frame, P frame or B frame.
5. coding method of video sequence according to claim 1 is characterized in that, the coding method of standard is an inter-frame encoding in the described step 3.
6. coding method of video sequence according to claim 5 is characterized in that, described inter-frame encoding is to encode as the reference frame with the former frame of present frame.
7. coding method of video sequence according to claim 1 is characterized in that, in the described step 4 core reference frame image being taked the inter-frame encoding coding is to encode as the reference frame with the correct core reference frame of accepting before the present frame.
8. the error control method of a video transmission is characterized in that, comprising:
Take intraframe coding method to encode to video sequence first two field picture;
Core reference frame is inserted in several positions after first two field picture in video sequence;
Non-core reference frame image in the video sequence is encoded according to the coding method of standard;
Core reference frame image in the video sequence is taked the inter-frame encoding coding;
The video sequence of received code is decoded and feedback decoding information then;
The video sequence of transfer encoding and the decoded information of feedback.
9. the error control method of video transmission according to claim 8, it is characterized in that, described in video sequence after first two field picture several positions insert core reference frame steps and be included in the video sequence and insert core reference frame every fixed intervals, or according to rate-distortion optimization Model Selection core reference frame, or the affirmation Information Selection core reference frame of passing back according to feedback channel.
10. the error control method of video transmission according to claim 8 is characterized in that, the coding method of described standard is for taking the inter-frame encoding coding.
11. the error control method of video transmission according to claim 10 is characterized in that, described inter-frame encoding takes former frame with present frame as the reference frame.
12. the error control method of video transmission according to claim 8, it is characterized in that described core reference frame image in the video sequence is taked in the inter-frame encoding coding step is to encode as the reference frame with the correct core reference frame that receives before the present frame.
13. the accuracy control system of a video transmission is characterized in that, comprising:
Encoder, be used for taking intraframe coding method to encode to video sequence first two field picture, core reference frame are inserted in several positions after first two field picture in video sequence, and the non-core reference frame image in the video sequence is encoded according to the coding method of standard and the core reference frame image in the video sequence is taked the inter-frame encoding coding;
Decoder, the video sequence that is used for received code is decoded then, and the condition feedback of will decoding is to encoder;
Channel is used for the video sequence of: 1 transcoder coding and the information of feedback decoder decoding.
14. the accuracy control system of video transmission according to claim 13 is characterized in that, described channel comprises:
Transmission channel is used for the video sequence that transfer encoding plays coding;
Feedback channel is used for the information that feedback decoder is decoded.
15. the accuracy control system of video transmission according to claim 13 is characterized in that, described encoder, decoder and channel life period postpone.
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| CN 200710063541 CN101237587A (en) | 2007-02-02 | 2007-02-02 | A video sequence coding method and its error control system |
| PCT/CN2007/000651 WO2008095345A1 (en) | 2007-02-02 | 2007-03-01 | A method for encoding a video sequence and a error remedying system using same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101127919B (en) * | 2007-09-28 | 2010-08-04 | 中兴通讯股份有限公司 | A video sequence coding method |
| CN102378008A (en) * | 2011-11-02 | 2012-03-14 | 深圳市融创天下科技股份有限公司 | Video encoding method, video encoding device and video encoding system for shortening waiting time for playing |
| CN106534871A (en) * | 2016-12-06 | 2017-03-22 | 北京大学 | Coding method and decoding method for video codec |
| CN107018413A (en) * | 2016-01-28 | 2017-08-04 | 安讯士有限公司 | Method for video coding and video encoder system |
| CN108184126A (en) * | 2017-12-27 | 2018-06-19 | 生迪智慧科技有限公司 | Video coding and coding/decoding method, the encoder and decoder of snapshot image |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100374245B1 (en) * | 1996-04-19 | 2003-05-09 | 오끼 덴끼 고오교 가부시끼가이샤 | Image Encoder, Image Decoder and Image Transfer System |
| DE10358846A1 (en) * | 2003-12-16 | 2005-07-21 | Nekritch, Iakov, Dr. | Video data method for compressing and transmitting video data has prioritized protection for different parts of a data stream divided into classes according to importance |
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2007
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101127919B (en) * | 2007-09-28 | 2010-08-04 | 中兴通讯股份有限公司 | A video sequence coding method |
| CN102378008A (en) * | 2011-11-02 | 2012-03-14 | 深圳市融创天下科技股份有限公司 | Video encoding method, video encoding device and video encoding system for shortening waiting time for playing |
| CN107018413A (en) * | 2016-01-28 | 2017-08-04 | 安讯士有限公司 | Method for video coding and video encoder system |
| CN106534871A (en) * | 2016-12-06 | 2017-03-22 | 北京大学 | Coding method and decoding method for video codec |
| CN106534871B (en) * | 2016-12-06 | 2019-06-07 | 北京大学 | The coding method of Video Codec and coding/decoding method |
| CN108184126A (en) * | 2017-12-27 | 2018-06-19 | 生迪智慧科技有限公司 | Video coding and coding/decoding method, the encoder and decoder of snapshot image |
| CN113573063A (en) * | 2021-06-16 | 2021-10-29 | 百果园技术(新加坡)有限公司 | Video coding and decoding method and device |
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