CN104159107B - The static image coding method of multi-channel video signal - Google Patents
The static image coding method of multi-channel video signal Download PDFInfo
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- CN104159107B CN104159107B CN201410447134.8A CN201410447134A CN104159107B CN 104159107 B CN104159107 B CN 104159107B CN 201410447134 A CN201410447134 A CN 201410447134A CN 104159107 B CN104159107 B CN 104159107B
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Abstract
The present invention realizes multi channel signals self-inspection flow using step S1, and passage switching and locking control flow are realized using step S2 and S3, final to realize JPEG codings and bite rate control flow using step S4 to S7.So, the present invention can carry out real-time still image JPEG compression to multichannel in 1Mbps channels and encode, passage locking judgement, frame frequency can be automatically performed to judge and threshold calculations, channel utilization is promoted to more than 90% by the real-time rate control technology based on image frame sign, and coded image can be exported to delays time to control within 800ms.
Description
Technical field
The present invention relates to multimedia data compression coding techniques field, more particularly to a kind of static state of multi-channel video signal
Method for encoding images.
Background technology
With continuing to develop for space monitoring technology, its in space industry for monitoring range demand also increasingly
Height, now the port number of image increases obvious in spacecraft.In order to meet the monitoring demand of triple channel image, coding techniques
Need while the coding of completion triple channel still image, realizes that the multiway images of space monitoring equipment are imaged the need of encoding function
Ask.Simultaneously because the requirement in space application to real-time and the limitation to channel width, space industry pole need real-time it is high,
The high coding method of picture quality.
For still image coding, data compression is carried out using JPEG coded systems.JPEG coded systems have algorithm letter
Single, the preferable advantage of picture quality, can meet the Image Coding demand in supervision application.But using digital signal processor as carrier
The JPEG coding methods of realization have the shortcomings that code stream and the difficult control of delay.
The content of the invention
The technical problem to be solved in the present invention is code stream and delay how in the coding method of Solving Multichannel vision signal
The problem of hardly possible control
In order to solve this technical problem, the invention provides a kind of still image coding side of multi-channel video signal
Method, comprises the following steps：
S1：Complete the self-inspection of multiple passages, and marked invalid passage one by one, after the completion of enter step S2；
S2：The vision signal for receiving transmission and coming；
When current channel is the non-valid channel marked in step S1, then next passage is switched to；
When the non-valid channel marked in the non-step S1 of current channel, the time required to statistics obtains passage locking；And it is defeated
Go out corresponding image to encode；It is then switched to next passage；
S3：Repeat step S2, until complete the lockings of three all effective passages, statistics obtains wherein all every time having
The time required to imitating passage locking, the average time obtained needed for nearly three subchannels locking is calculated, and then obtain corresponding average frame
Frequently；
S4：The decision threshold of code length instantly is determined according to the obtained average frame frequencies of step S3；
S5：The code length and step S4 that compare previous frame image obtain the decision threshold of code length instantly, so that
According to the comparative result quantizing factor that amendment is encoded for the first time；
S6：Compare output buffer size and default buffer size threshold value, so that according to comparative result to step S5
Obtained quantizing factor carries out second and corrected；
S7：The coding when next two field picture is carried out according to the revised quantizing factors of step S6.
In the step S1, the process of self-test of single passage at least includes：Current channel locking is waited, if 500 milliseconds
It is still unlocked afterwards, then judge the passage for non-valid channel.
In the step S2, during statistics is obtained the time required to passage locking, first statistics obtains passage letter
Number locking needed for frame number n, then according to below equation calculate obtains the passage locking the time required to Tlock：
Tlock=(n+1)/F
Wherein, F is input frame.
In the step S2, for any one effective passage, if it is still unlocked more than after 15 frames, then the passage
The statistical value n of frame number needed for semaphore lock takes 15, and the 16th two field picture is forced into output.
In the step S2, for any one effective passage,
If the frame number needed for the locking recorded is more than 7 frame, the frame number of the record is taken to lock institute for the channel signal
The statistical value n of the frame number needed, and export next two field picture；
If the frame number needed for the locking recorded is not more than 7, the statistical value n of the frame number needed for channel signal locking
7 are taken, and exports the 8th two field picture；
In the step S3, obtaining the process of average frame frequency includes：
First calculated according to below equation and obtain the required average time T of nearly three subchannels lockinglockavg：
Tlockavg=(Tlock_1+Tlock_2+Tlock_3)/3
Wherein, Tlock_、Tlock_2、Tlock_3For the locking time of nearly three times all effective passages；
Then, calculated according to below equation and obtain the frame frequency F that is averaged accordinglyavg：Favg=1/ (Tlockavg)。
In the step S4, the decision threshold N of code length instantlythDetermined by below equation：
Nth=0.95B/Favg；
Wherein, B is the bandwidth of output channel.
In the step S5,
If NlstFall in 95%NthWith 105%NthBetween, then quantizing factor Q is not corrected；
If NlstFall in 105%NthWith 110%NthBetween, then quantizing factor Q increases by 5 in initial value；
If NlstFall in 90%NthWith 95%NthBetween, then quantizing factor Q reduces 5 in initial value；
If NlstLess than 90%Nth, then quantizing factor Q reduce 10 in initial value；
If NlstMore than 110%Nth, then quantizing factor Q increase by 10 in initial value；
Wherein, NlstFor the code length of previous frame image, NthFor the decision threshold N of code length instantlyth。
In the step S6, the default buffer size threshold value is set to 500kb；
If output buffer size falls in the range of 500kb to 800kb, quantizing factor Q reduces 5；
If output buffer size reduces 10 more than 800kb, quantizing factor.
Also comprise the following steps before the step S7：
If the quantizing factor obtained after step S6 amendments is not more than 20, quantizing factor is modified to 20；
If the quantizing factor obtained after step S6 amendments is not less than 100, quantizing factor is modified to 100.
Optionally, the quantity of passage is not more than six.
The present invention realizes multi channel signals self-inspection flow using step S1, and passage switching is realized using step S2 and S3
With locking control flow, finally JPEG codings and bite rate control flow are realized using step S4 to S7.So, the present invention can be
Real-time still image JPEG compression is carried out to multichannel to encode, can be automatically performed passage locking judgement, frame frequency and sentence in 1Mbps channels
Disconnected and threshold calculations, more than 90% is promoted to by the real-time rate control technology based on image frame sign by channel utilization,
And coded image can be exported to delays time to control within 800ms.The static state of multi-channel video signal can be realized using the present invention
Image Coding and lifting channel utilization, the purpose of reduction data delay.
Brief description of the drawings
Fig. 1 is the hardware carrier in one embodiment of the invention；
Fig. 2 is the flow chart of the coding method of three-channel video signal in one embodiment of the invention；
Fig. 3 carries triple channel switching and the flow chart of locking control flow in an embodiment for the present invention.
Fig. 4 is the flow chart of the JPEG codings of amendment quantizing factor in one embodiment of the invention.
Embodiment
Carried out below with reference to the static image coding method of Fig. 1 to Fig. 4 multi-channel video signals provided the present invention
Detailed description, it is an optional embodiment of the invention, it is believed that those skilled in the art is not changing essence of the invention
It is modified and polished in the range of god and content.
The present embodiment is illustrated by taking triple channel as an example, it is considered that, no matter several passages, be all the present invention make every effort to protection side
One of case.Optionally, the quantity of passage is not more than six.
Fig. 1 be one embodiment of the invention in hardware carrier, include video digital-to-analogue A/D, digital signal processor and
Various interfaces and storage device.
The invention provides a kind of static image coding method of multi-channel video signal, specific in the present embodiment, carry
Supplied a kind of static image coding method of three-channel video signal, including step S1 is to S6, refer to Fig. 1 and Fig. 2, below by
Step expansion is illustrated.
S1：Complete the self-inspection of multiple passages, and marked invalid passage one by one, after the completion of enter step S2；
In the step S1, the process of self-test of single passage at least includes：Current channel locking is waited, if 500 milliseconds
It is still unlocked afterwards, then judge the passage for non-valid channel.
In the present embodiment, the self-inspection of three passages is first completed during starting, specific method is first judgement current channel locking
Register value (is defaulted as 1 passage), if signal unlocked rule after 500ms judges current channel without view data, then by upper
State step and complete the self-inspection of rest channels and the mark of non-valid channel.
Fig. 3 is refer to, and combines other accompanying drawings：
S2：The vision signal for receiving transmission and coming；
When current channel is the non-valid channel marked in step S1, then next passage is switched to；
When the non-valid channel marked in the non-step S1 of current channel, the time required to statistics obtains passage locking；And it is defeated
Go out corresponding image to encode；It is then switched to next passage；
In the step S2, during statistics is obtained the time required to passage locking, first statistics obtains passage letter
Number locking needed for frame number n, then according to below equation calculate obtains the passage locking the time required to Tlock：
Tlock=(n+1)/F
Wherein, F is input frame.
In the step S2, for any one effective passage, if it is still unlocked more than after 15 frames, then the passage
The statistical value n of frame number needed for semaphore lock takes 15, and the 16th two field picture is forced into output.
In the step S2, for any one effective passage,
If the frame number needed for the locking recorded is more than 7 frame, the frame number of the record is taken to lock institute for the channel signal
The statistical value n of the frame number needed, and export next two field picture；
If the frame number needed for the locking recorded is not more than 7, the statistical value n of the frame number needed for channel signal locking
7 are taken, and exports the 8th two field picture；
S3：Repeat step S2, repeats the locking of at least all effective passages of three-wheel, generally, effective passage is to lock successively
, the locking of all effective passages of wheel is completed, that is, refers to the locking for completing once all effective passages, also can be described as, weight
Multiple step S2, until completing the locking of three all effective passages, statistics obtains wherein each all effective passages locking institutes
Take time, calculate the average time obtained needed for nearly three times all passage lockings, also can be described as average computation and often take turns all logical
Time needed for road locking, and then obtain the frame frequency that is averaged accordingly；In the step S3, the process bag of average frame frequency is obtained
Include：
First calculated according to below equation and obtain the nearly three times required average time T of all passage lockingslockavg：
Tlockavg=(Tlock_1+Tlock_2+Tlock_3)/3
Wherein, Tlock_1、Tlock_2、Tlock_3For the locking time of nearly three times all effective passages, specifically Tlock_1It is
The time required to completing all passage lockings for the first time, Tlock_2The time required to being all passage lockings of second of completion, Tlock_3It is
The time required to third time completes the locking of all passages, each time during, passage is all to switch successively, is locked one by one, record
Down after the locking time of each passage, so that it may once completed the time needed for all passage lockings；
Then, calculated according to below equation and obtain the frame frequency F that is averaged accordinglyavg：
Favg=1/ (Tlockavg)。
As shown in Fig. 2 step S2 to S3 also may be regarded as passage switching and locking control flow, switch into passage with locking
After control flow, switch to current channel and carry out effective passage judgement, count passage locking time and average lock again after
Time, with this calculate average frame frequency go forward side by side row of channels switching.
In the present embodiment, can embody be described as it is following：
1) whether current channel is judged to be effective according to self-detection result, passage is entered if effectively and locks decision state, if
It is invalid then to enter passage switching state；
2) current channel is locked and frame number is more than next two field picture is exported after 7 frames, if still unlocked more than passage after 15 frames
Rule forces the 16th two field picture to export, and calculates the time required for current channel locking；
Input frame is that F is 25fps, therefore current channel locking time is calculated as follows, and unit is s,
Tlock=(n+1)/25
Wherein n frame numbers for needed for being locked channel signal
3) determine whether to complete three effective passage switchings, if so, then calculating the average frame frequency of nearly triple channel and will switch
Number of times is reset, if not then entering passage switching state；
Average lock time Tlockavg=(Tlock-2+Tlock-1+Tlock)/3
Average frame frequency Favg=1/ (Tlockavg)
Content for more than, it should however be clear that how to determine whether that realizing locking belongs to the general knowledge of this area, once realize
This judgement, can realize the statistic record of frame number needed for judging naturally.In the present embodiment, Fig. 1 is refer to, wherein AD devices are
Vision signal analog-digital chip, can be cut by digital signal processor to the selected routing value of its inner passage register write
Change passage, at the same can also access the A/D chip passage locking status register come confirm current channel vision signal whether
It is locked.After switching channel, the register value can be set to " 0 ", and A/D chip can be to the current channel vision signal weight after switching
It is new to carry out locking judgement, and be set to register value " 1 " after locking is realized.General, for all passages, this kind becomes
Change is consistent, so, as long as judging whether register is changed into " 1 ", it is possible to judge whether to realize the locking of vision signal.
Fig. 4 is refer to, and combines other accompanying drawings：
S4：The decision threshold of code length instantly is determined according to the obtained average frame frequencies of step S3；
In the step S4, the decision threshold N of code length instantlythDetermined by below equation：
Nth=0.95B/Favg；
Wherein, B is the bandwidth of output channel.
S5：The code length and step S4 that compare previous frame image obtain the decision threshold of code length instantly, so that
According to the comparative result quantizing factor that amendment is encoded for the first time；
In the step S5,
If NlstFall in 95%NthWith 105%NthBetween, then quantizing factor Q is not corrected；
If NlstFall in 105%NthWith 110%NthBetween, then quantizing factor Q increases by 5 in initial value；
If NlstFall in 90%NthWith 95%NthBetween, then quantizing factor Q reduces 5 in initial value；
If NlstLess than 90%Nth, then quantizing factor Q reduce 10 in initial value；
If NlstMore than 110%Nth, then quantizing factor Q increase by 10 in initial value；
Wherein, NlstFor the code length of previous frame image, NthFor the decision threshold N of code length instantlyth。
S6：Compare output buffer size and default buffer size threshold value, so that according to comparative result to step S5
Obtained quantizing factor carries out second and corrected；
In the step S6, the default buffer size threshold value is set to 500kb；
If output buffer size falls in the range of 500kb to 800kb, quantizing factor Q reduces 5；
If output buffer size reduces 10 more than 800kb, quantizing factor.
S7：The coding when next two field picture is carried out according to revised quantizing factor.
Before the step S7, also comprise the following steps after S6：
If the quantizing factor obtained after step S6 amendments is not more than 20, quantizing factor is modified to 20；
If the quantizing factor obtained after step S6 amendments is not less than 100, quantizing factor is modified to 100.
As shown in Fig. 2 the step of step S4 is between S7 also may be regarded as JEPG codings and bite rate control flow.Also it can describe
To carry out current channel still image JPEG codings, real-time judgment present encoding two field picture size, according to threshold range amendment
The JPEG coded quantization factors, while judge the relation between buffer size and given threshold and corrected again, and by coded number
According to output.
Specifically, in the present embodiment, JPEG is encoded with bite rate control flow to the image received by jpeg algorithm
Encoded, quantizing factor during adjustment JPEG compression coding, improves compressed bit stream real-time and channel utilization, specifically in real time
Way is as follows：
1) present frame is carried out by the quantizing factor Q values calculated jpeg image coding and exporting, with 70 (scope 0~
100) as the default quantization factor values Q of JPEG compressiondefFirst two field picture is encoded and exported, then enters row of channels and cuts
Change；
2) with Fdef=3fps calculates the default threshold N of code length as initial frame frequency meterdef=317Kb, with step S3
The decision threshold N of current image date is updated on the basis of the average frame frequency of middle calculatingth, unit is Kb, and formula is as follows, and wherein B is
Export channel width, unit K bps.
Nth=(B × 0.95)/Favg
3) on the basis of the decision threshold of calculating, previous frame Image Coding length N is judgedlst, calculate the length long with threshold value
The difference of degree.If NlstFall in 95%NthWith 105%NthScope, quantizing factor is constant；If NlstFall in 105%NthWith 110%Nth
Scope, quantizing factor Jia 5 in original value；If NlstFall in 90%NthWith 95%NthScope, quantizing factor subtracts in original value
5；If NlstLess than 90%Nth, quantizing factor subtracts 10 in original value；If NlstMore than 110%Nth, quantizing factor is in original value
Plus 10.
4) more than completing the 3) after step to output buffer size DbufJudged, set decision threshold as 500Kb,
If current buffer size is in 500Kb~800Kb, quantizing factor is subtracted 5 by quantization, if more than 800Kb, subtracting 10 by quantizing factor.
5) judge the current size for calculating Q values, Q values are entered as 20 if less than 20, by Q value assignment if more than 100
For 100, remaining situation Q values are not corrected.
6) wait after passage locks and discharge, using the numerical value as quantizing factor during Image Coding, and using the value as
The reference value that the coded quantization factor of lower next frame is calculated.
The present invention realizes multi channel signals self-inspection flow using step S1, and passage switching is realized using step S2 and S3
With locking control flow, finally JPEG codings and bite rate control flow are realized using step S4 to S7.So, the present invention can be
Real-time still image JPEG compression is carried out to multichannel to encode, can be automatically performed passage locking judgement, frame frequency and sentence in 1Mbps channels
Disconnected and threshold calculations, more than 90% is promoted to by the real-time rate control technology based on image frame sign by channel utilization,
And coded image can be exported to delays time to control within 800ms.The static state of multi-channel video signal can be realized using the present invention
Image Coding and lifting channel utilization, the purpose of reduction data delay.
Claims (11)
1. a kind of static image coding method of multi-channel video signal, comprises the following steps：
S1：Complete the self-inspection of multiple passages, and marked invalid passage one by one, after the completion of enter step S2；
S2：The vision signal for receiving transmission and coming；
When current channel is the non-valid channel marked in step S1, then next passage is switched to；
When the non-valid channel marked in the non-step S1 of current channel, the time required to statistics obtains passage locking；And export phase
The image answered is to encode；It is then switched to next passage；
S3：Repeat step S2, until completing the locking of three all effective passages, statistics obtains wherein all effectively logical every time
The time required to road locking, the average time obtained needed for nearly three times all passage lockings is calculated, and then obtain corresponding average frame
Frequently；
S4：The decision threshold of code length instantly is determined according to the obtained average frame frequencies of step S3；
S5：The code length and step S4 that compare previous frame image obtain the decision threshold of code length instantly, so that foundation
The comparative result quantizing factor that amendment is encoded for the first time；
S6：Compare output buffer size and default buffer size threshold value, so as to be obtained according to comparative result to step S5
Quantizing factor carry out second and correct；
S7：The coding when next two field picture is carried out according to the revised quantizing factors of step S6.
2. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S1, the process of self-test of single passage at least includes：Current channel locking is waited, if still unlocked after 500 milliseconds, judging should
Passage is non-valid channel.
3. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S2, during statistics is obtained the time required to passage locking, first statistics obtains the frame number n needed for channel signal locking,
Then T the time required to obtaining passage locking is calculated according to below equationlock：
Tlock=(n+1)/F
Wherein, F is input frame.
4. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S2, for any one effective passage, if it is still unlocked more than after 15 frames, the required frame number of channel signal locking
Statistical value n takes 15, and the 16th two field picture is forced into output.
5. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S2, for any one effective passage,
If the frame number needed for the locking recorded is more than 7 frame, the frame number of the record is taken for needed for channel signal locking
The statistical value n of frame number, and export next two field picture；
If the frame number needed for the locking recorded is not more than 7, the statistical value n of the frame number needed for channel signal locking takes 7,
And export the 8th two field picture.
6. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S3, obtaining the process of average frame frequency includes：
First calculated according to below equation and obtain the nearly three times required average time T of all passage lockingslockavg：
Tlockavg=(Tlock_1+Tlock_2+Tlock_3)/3
Wherein, Tlock_、Tlock_2、Tlock_3For the locking time of nearly three times all effective passages；
Then, calculated according to below equation and obtain the frame frequency F that is averaged accordinglyavg：
Favg=1/ (Tlockavg)。
7. the static image coding method of multi-channel video signal as claimed in claim 6, it is characterised in that：In the step
In S4, the decision threshold N of code length instantlythDetermined by below equation：
Nth=0.95B/Favg；
Wherein, B is the bandwidth of output channel.
8. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S5,
If NlstFall in 95%NthWith 105%NthBetween, then quantizing factor Q is not corrected；
If NlstFall in 105%NthWith 110%NthBetween, then quantizing factor Q increases by 5 in initial value；
If NlstFall in 90%NthWith 95%NthBetween, then quantizing factor Q reduces 5 in initial value；
If NlstLess than 90%Nth, then quantizing factor Q reduce 10 in initial value；
If NlstMore than 110%Nth, then quantizing factor Q increase by 10 in initial value；
Wherein, NlstFor the code length of previous frame image, NthFor the decision threshold N of code length instantlyth。
9. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
In S6, the default buffer size threshold value is set to 500kb；
If output buffer size falls in the range of 500kb to 800kb, quantizing factor Q reduces 5；
If output buffer size reduces 10 more than 800kb, quantizing factor.
10. the static image coding method of multi-channel video signal as claimed in claim 1, it is characterised in that：In the step
Also comprise the following steps before rapid S7：
If the quantizing factor obtained after step S6 amendments is not more than 20, quantizing factor is modified to 20；
If the quantizing factor obtained after step S6 amendments is not less than 100, quantizing factor is modified to 100.
11. the static image coding method of the multi-channel video signal as described in claim 1 to 10 is one of any, its feature exists
In：The quantity of passage is not more than six.
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| CN1984327A (en) * | 2006-05-16 | 2007-06-20 | 华为技术有限公司 | Video-frequency compression method |
| CN101552913A (en) * | 2009-05-12 | 2009-10-07 | 腾讯科技（深圳）有限公司 | Multi-channel video communication system and processing method |
| CN102088590A (en) * | 2009-12-03 | 2011-06-08 | 北京彩讯科技股份有限公司 | Method for multiplexing transmission channel by multi-channel real-time images |
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| CN1984327A (en) * | 2006-05-16 | 2007-06-20 | 华为技术有限公司 | Video-frequency compression method |
| CN101552913A (en) * | 2009-05-12 | 2009-10-07 | 腾讯科技（深圳）有限公司 | Multi-channel video communication system and processing method |
| CN102088590A (en) * | 2009-12-03 | 2011-06-08 | 北京彩讯科技股份有限公司 | Method for multiplexing transmission channel by multi-channel real-time images |
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