CN1406072A - Video-frequency compressed code ratio control method - Google Patents
Video-frequency compressed code ratio control method Download PDFInfo
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- CN1406072A CN1406072A CN 01130703 CN01130703A CN1406072A CN 1406072 A CN1406072 A CN 1406072A CN 01130703 CN01130703 CN 01130703 CN 01130703 A CN01130703 A CN 01130703A CN 1406072 A CN1406072 A CN 1406072A
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- 238000000034 method Methods 0.000 title claims description 12
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000008713 feedback mechanism Effects 0.000 abstract 1
- 238000013139 quantization Methods 0.000 abstract 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
Based on the code rate controlled by the first order distortion model, the feedback mechanism is added in the invention in order to change the target code rate, making the code rate control more accurate and the calcualting speed of the first order model quicker. Using statistical frame loss history averages the interval of the frame loss. Meanwhile, when frame loss happens, the user is allowed choosing the trade-off decision between the image quality and the frame rate by referencing the magnitude of the quantization factor. The invention possesses the advantages of fast speed, high accuracy as well as smooth change of the image quality compressed.
Description
The present invention relates to accurately control fast in a kind of video compression the method for code check.
Because video coding is relevant with content, the data volume of the frame that compressed can change, and the data volume (code check) in the unit interval just has fluctuation like this.And in actual applications, when especially video flowing transmits, need constant code check.The principle of Rate Control be exactly utilize a kind of Mathematical Modeling come by current known user specify code check and the compression bit number recomputate the quantizing factor of next frame, thereby change the bit number behind the coding, reach the purpose of control code check.
At present the reasonable method of Rate Control is the gradability Rate Control strategy (SRC) that proposes among the MPEG4, this mode to the effect that utilize the second order rate-distortion model, and Rate Control is refine on each piece or the macro block.The shortcoming of this method is that computing is too complicated, realizes difficulty.
For solving problems of the prior art, the present invention proposes the rate control algorithm that a kind of operand is few and control precision is high.
Below method of the present invention is made an explanation:
(1) the present invention utilizes single order rate-distortion model R=X1*S*Q** (1), wherein R represents the encoded data volume that obtains (bit number), and X1 is the model coefficient of first order, and S is current genuine complexity, MAD represents with the average absolute value difference, and Q is the quantizing factor that soon needs.
1. initial model coefficient X1;
2. calculate the target bit rate of present frame:
3. calculating quantizing factor;
4. renewal model parameter.
Above-mentioned 4 steps describe in the mpeg 4 standard document, except: use the single order rate-distortion model;
Step 2 middle finger constant bit rate can change, (2) explanation below of change method;
(2) 1. count initialized device count=0, target bit rate rising counter count_up=1, target bit rate reduces counter count_down=-1, and target bit rate=user specifies code check;
2. intact frame comparison actual bit rate of every compression and user specify code check, if the former greatly then count add 1, if the latter greatly then count subtract 1;
3. if count is greater than N
*Count_up, wherein N is a specified threshold value, refers generally to be decided to be 15, count_up adds 1, count=0, and: if count_down＜-1, then target bit rate is re-set as the user and specifies code check
*(1+Alpha), general Alpha=0.05, count down=-1 simultaneously; Otherwise target bit rate adds current target bit rate
*Beta, general Beta=0.10;
4. if count is less than N
*Count_down, wherein N is a specified threshold value, refers generally to be decided to be 15, count_down subtracts 1, count=0, and: if count_up＞1, then target bit rate is re-set as the user and specifies code check
*(1-Alpha), general Alpha=0.05, count_up=1 simultaneously; Otherwise target bit rate subtracts the current goal code check
*Beta, general Beta=0.10;
(3) interval of statistics frame losing, the interval of two frames remains between average frame losing positive and negative 1 frame at interval, and frame losing is influenced by current quantizing factor:
1. if the interval between a present frame and the last coded frame subtracts 1 then lose this frame less than the equispaced;
2. if the interval between a present frame and the last coded frame equals the equispaced and adds 1 then coding;
3. when other situation: if current quantizing factor has surpassed a certain specified threshold value, code check has surpassed the appointment code check simultaneously, then abandons this frame.This threshold value control is lost trading off between video quality and the frame losing, suggestion value 31 when code check is low.
This method utilization feedback changes target bit rate, tend towards stability in shorter time through the evidence Rate Control, and the code check fluctuation is littler; Because frame losing is average, make that also the video visual effect is better simultaneously; At last, the single order rate-distortion model operand of employing is little, and speed is faster.
Claims (5)
1. method that improves rate control accuracy and speed in the video compression, its feature comprises:
(a) adopt feedback strategy to change the current goal code check, use be higher than continuously or be lower than continuously specify code check frame number as feedback data.
(b) interval of average frame losing.
(c) with the size of quantizing factor as one of condition of frame losing.
2. according to the method described in the claim 1 (a), it is characterized in that adjusting the target bit rate of user's appointment according to the historical record of code check.Surpass some threshold value T1 if surpass the frame number of specifying code check continuously, then reduce and specify code check; Surpass threshold value T2 if be lower than the frame number of specifying code check continuously, then increase and specify code check.Threshold value T1 and T2 can dynamically adjust.
3. in claim 2, recording more satisfactory initial threshold (T1 and T2 are suitable for simultaneously, down together) according to test is 1/2 of frame per second, and when equidirectional variation each time, threshold value doubles.Equidirectional variation refers to if last this is to surpass continuously because surpass continuously that the frame number of code check surpasses threshold value, all is to change threshold value because of being lower than code check continuously more than perhaps double.
4. according to the method described in the claim 1 (b), it is characterized in that controlling the interval of frame losing, make interval between two frames between positive and negative 1 frame of equispaced according to the historical record of frame losing.
5. according to the method described in the claim 1 (c), it is characterized in that being provided with the threshold value of a quantizing factor, only just allow frame losing during greater than this threshold value at current quantizing factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01130703XA CN1294757C (en) | 2001-08-21 | 2001-08-21 | Video-frequency compressed code ratio control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01130703XA CN1294757C (en) | 2001-08-21 | 2001-08-21 | Video-frequency compressed code ratio control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1406072A true CN1406072A (en) | 2003-03-26 |
| CN1294757C CN1294757C (en) | 2007-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01130703XA Expired - Fee Related CN1294757C (en) | 2001-08-21 | 2001-08-21 | Video-frequency compressed code ratio control method |
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| CN (1) | CN1294757C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425079C (en) * | 2006-08-07 | 2008-10-08 | 浙江大学 | Method of controlling rate of video compression code based on query table in low memory consumption |
| CN100481943C (en) * | 2006-12-30 | 2009-04-22 | 清华大学 | Method for control video frequency coding rate |
| CN100515021C (en) * | 2006-12-30 | 2009-07-15 | 中国科学院计算技术研究所 | Image quality and constrained code rate based JPEG2000 code rate control method |
| CN100515068C (en) * | 2006-05-23 | 2009-07-15 | 中国科学院声学研究所 | Static frame loss method in video playing |
| CN101252689B (en) * | 2008-02-29 | 2010-08-25 | 杭州爱威芯科技有限公司 | Self-adapting code rate control method |
| CN102075739A (en) * | 2010-09-15 | 2011-05-25 | 深圳市九洲电器有限公司 | Method and device for smoothly playing fast-forward/fast-rewind played network videos |
| CN101292551B (en) * | 2005-09-14 | 2011-06-15 | 株式会社Ntt都科摩 | Wireless base station and method for transmitting data common to users |
| CN101632308B (en) * | 2007-03-14 | 2011-08-03 | 日本电信电话株式会社 | Encoding bit rate control method and device |
| CN101653003B (en) * | 2007-03-13 | 2012-01-04 | 马蒂亚斯·纳罗施克 | Quantization coding/ decoding method,encoder and demoder for hybrid video coding |
| CN102428705A (en) * | 2010-03-18 | 2012-04-25 | 松下电器产业株式会社 | Data processing device and data processing method |
| CN104469367A (en) * | 2014-12-16 | 2015-03-25 | 南京仟壹视讯信息技术有限公司 | Video bitrate control method based on frame loss and quantization parameter adjustment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5889561A (en) * | 1994-11-04 | 1999-03-30 | Rca Thomson Licensing Corporation | Method and apparatus for scaling a compressed video bitstream |
| US6263022B1 (en) * | 1999-07-06 | 2001-07-17 | Philips Electronics North America Corp. | System and method for fine granular scalable video with selective quality enhancement |
-
2001
- 2001-08-21 CN CNB01130703XA patent/CN1294757C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101292551B (en) * | 2005-09-14 | 2011-06-15 | 株式会社Ntt都科摩 | Wireless base station and method for transmitting data common to users |
| CN100515068C (en) * | 2006-05-23 | 2009-07-15 | 中国科学院声学研究所 | Static frame loss method in video playing |
| CN100425079C (en) * | 2006-08-07 | 2008-10-08 | 浙江大学 | Method of controlling rate of video compression code based on query table in low memory consumption |
| CN100515021C (en) * | 2006-12-30 | 2009-07-15 | 中国科学院计算技术研究所 | Image quality and constrained code rate based JPEG2000 code rate control method |
| CN100481943C (en) * | 2006-12-30 | 2009-04-22 | 清华大学 | Method for control video frequency coding rate |
| CN101653003B (en) * | 2007-03-13 | 2012-01-04 | 马蒂亚斯·纳罗施克 | Quantization coding/ decoding method,encoder and demoder for hybrid video coding |
| CN101632308B (en) * | 2007-03-14 | 2011-08-03 | 日本电信电话株式会社 | Encoding bit rate control method and device |
| CN101252689B (en) * | 2008-02-29 | 2010-08-25 | 杭州爱威芯科技有限公司 | Self-adapting code rate control method |
| CN102428705B (en) * | 2010-03-18 | 2014-12-24 | 松下电器（美国）知识产权公司 | Data processing device and data processing method |
| CN102428705A (en) * | 2010-03-18 | 2012-04-25 | 松下电器产业株式会社 | Data processing device and data processing method |
| US9113173B2 (en) | 2010-03-18 | 2015-08-18 | Panasonic Intellectual Property Corporation Of America | Data processing device and data processing method which compresses image data |
| CN102075739B (en) * | 2010-09-15 | 2013-01-02 | 深圳市九洲电器有限公司 | Method and device for smoothly playing fast-forward/fast-rewind played network videos |
| CN102075739A (en) * | 2010-09-15 | 2011-05-25 | 深圳市九洲电器有限公司 | Method and device for smoothly playing fast-forward/fast-rewind played network videos |
| CN104469367A (en) * | 2014-12-16 | 2015-03-25 | 南京仟壹视讯信息技术有限公司 | Video bitrate control method based on frame loss and quantization parameter adjustment |
| CN104469367B (en) * | 2014-12-16 | 2017-11-14 | 北京金山云网络技术有限公司 | The video code rate control method adjusted based on frame losing and quantization parameter |
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| Publication number | Publication date |
|---|---|
| CN1294757C (en) | 2007-01-10 |
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Assignee: Beijing ZRS New Energy Technology Co.,Ltd. Assignor: Weisu Sci. & Tech. Co., Ltd., Beijing Contract record no.: 2011990000950 Denomination of invention: Video compression code ratio control method using uneven distribution of frame target bit number Granted publication date: 20070110 License type: Exclusive License Open date: 20030326 Record date: 20110930 |
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