CN101841709A - Shunting coding method for digital video monitoring system and video monitoring system - Google Patents
Shunting coding method for digital video monitoring system and video monitoring system Download PDFInfo
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Abstract
The embodiment of the invention discloses a shunting coding method for a digital video monitoring system. The method comprises the following steps: decomposing a video into primary video frames and secondary video frames by using two-dimensional wavelet transform; coding the primary video frames to generate a primary code stream and primary video reconstruction frames; and based on the primary video reconstruction frames, coding the secondary video frames to generate a secondary code stream. Corresponding, the embodiment of the invention also discloses a video monitoring system. The video monitoring system comprises a shunting module, a primary code stream coding module and a secondary code stream coding module, wherein the shunting module is used for decomposing the video into the primary video frames and the secondary video frames by using two-dimensional wavelet transform; the primary code stream coding module is used for coding the primary video frames to generate the primary code stream and the primary video reconstruction frames; and the secondary code stream coding module is used for coding the secondary video frames to generate the secondary code stream based on the primary video reconstruction frames. By implementing the invention, the digital video monitoring system can satisfy monitoring requirements for videos with different resolutions and enhance the video compression coding efficiency.
Description
Technical field
The invention belongs to areas of information technology, be specifically related to a kind of digital video monitor system shunting coding method and video monitoring system.
Background technology
Video monitoring has been widely used in industry-by-industry as an important security monitoring and guarantee instrument, and along with the fast development of mobile radio network technology and mobile communication equipment technology, the demand of mobile video monitor increases day by day.
In mobile terminal device, mobile phone is owing to its convenient dexterous main flow that accounts for.And mobile phone is used for digital video monitoring, and its video image displayed size generally is a low resolution.Like this, the digital video monitor system of server end can satisfy the high-resolution video monitoring demand except wanting, also want simultaneously to produce the low-resolution video image that meets the monitoring mobile phone demand, and existing video monitoring frame code stream can't satisfy the terminal that two kinds of different resolutions require simultaneously.
In addition, though network technology obtains significant progress at present, the speed of Network Transmission and stability still are subjected to the restriction of all technology and environmental factor, and existing video monitoring system can not well be mated existing network frame of video pattern.
Summary of the invention
The present invention proposes a kind of shunting coding method that is used for digital video monitor system, purpose is to make that digital video monitor system can satisfy the video monitoring demand of different resolution, and improve video compression coding efficient, to satisfy the Network Transmission requirement of digital video monitoring better.
In order to realize foregoing invention, the embodiment of the invention provides a kind of digital video monitor system shunting coding method, comprising:
Use two-dimensional wavelet transformation that frame of video is decomposed into main frame of video and time frame of video;
Main frame of video is carried out encoding process, produce main bit stream and main video reconstruction frames;
Based on main video reconstruction frames inferior frame of video is carried out encoding process, produce time code stream.
Described method is carried out encoding process based on main video reconstruction frames to inferior frame of video and is comprised:
Based on main video reconstruction frames inferior frame of video is carried out coded prediction and fast coding, wherein: described fast coding comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding.
Described method also comprises:
Judge the resolution of video monitoring terminal, send code stream to the video monitoring terminal according to the resolution judged result.
The resolution of described judgement video monitoring terminal sends code stream according to the resolution judged result to the video monitoring terminal and is specially:
When judging described video monitoring terminal and be the equipment of low resolution demand, send main bit stream to described video monitoring terminal;
When judging described video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to described video monitoring terminal.
Described method also comprises:
After described video monitoring terminal receives main bit stream and time code stream, respectively main bit stream and time code stream are decoded, and decoded main bit stream and time code stream are carried out synthetic operation.
Accordingly, the embodiment of the invention also provides a kind of video monitoring system, and described video monitoring system comprises:
Diverter module is used to use two-dimensional wavelet transformation that frame of video is decomposed into main frame of video and time frame of video;
The main bit stream coding module is used for main frame of video is carried out encoding process, produces main bit stream and main video reconstruction frames;
Inferior code stream coding module is used for based on main video reconstruction frames inferior frame of video being carried out encoding process, produces time code stream.
Inferior code stream coding module in the described system is used for based on main video reconstruction frames inferior frame of video being carried out coded prediction and fast coding, and wherein: described fast coding comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding.
Described system also comprises a judging treatmenting module, is used to judge the resolution of video monitoring terminal, sends code stream according to the resolution judged result to the video monitoring terminal.
Described judging treatmenting module is used for sending main bit stream to described video monitoring terminal when judging described video monitoring terminal and be the equipment of low resolution demand; Perhaps when judging described video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to described video monitoring terminal.
Described system also comprises a synthetic processing module, is used for respectively main bit stream and time code stream being decoded after described video monitoring terminal receives main bit stream and time code stream, and decoded main bit stream and time code stream are carried out synthetic operation.
Implement the embodiment of the invention, have following beneficial effect:
Method proposed by the invention can be so that the digital video monitor system of server end produces the primary and secondary video code flow, to satisfy the video monitoring demand of different resolution.Wherein, the main bit stream that coding produces can directly produce the video frame image of low resolution through decoding; And main bit stream and time code stream are decoded respectively after synthesizing again, and can produce high-resolution video frame image.
Method proposed by the invention can improve the video image compression ratio, satisfies the Network Transmission requirement better.Video coding algorithm compared to direct employing high compression ratio is encoded to whole two field picture, and the strategy that shunting coding method of the present invention adopts is whole two field picture to be carried out 2-d wavelet decompose, and then further distinguishes coding.The main frame of video of decomposing gained through 2-d wavelet is the low frequency part of former frame of video, and this part is owing to removed the influence of detail of the high frequency preferably, can reflect the contact of interframe better, adopt the video coding algorithm of high compression ratio can access better compression effectiveness this moment.And the inferior frame of video of decomposing gained, the high frequency detail section that mainly comprises former frame of video, but itself and low frequency part (promptly main frame of video) still have bigger correlation, can reduce amount of information effectively so inferior frame of video is carried out predictive coding based on main video reconstruction frames, and then residual error compared coarse fast coding, can how not damage under the prerequisite of video image visual quality, improve the data compression ratio.
Method proposed by the invention, be frame of video to be resolved into the primary and secondary frame of video distinguish coding again, seeming complexity and operand has all increased much, but in fact required operand is with directly similar to the required operand of the video coding algorithm of the high compression ratio of whole frame coding, even can further reduce on the contrary accepting or rejecting under the proper situation.This is because the operand of two-dimensional wavelet transformation only is proportional to video frame size, and is little to the influence of integral operation amount; Main frame of video is owing to size decreases, and required operand is about 1/4th of whole frame coding; And,, add more coarse fast coding if can adopt effective linear predictive coding to the coding of inferior frame of video, required operand also can solution in 3/4ths operands that whole frame is encoded, even can more save time.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the digital video monitor system shunting coding method in the embodiment of the invention;
Fig. 2 is the video monitoring system structural representation in the embodiment of the invention;
Fig. 3 be in the embodiment of the invention based on the two-dimensional wavelet transformation exemplary plot;
Fig. 4 is the coding flow chart of the inferior code stream coding module 203 in the embodiment of the invention;
Fig. 5 is the fast coding flow chart in the inferior code stream coding module 203 in the embodiment of the invention;
Fig. 6 is another structural representation of the video monitoring system in the embodiment of the invention;
Fig. 7 is another flow chart of the digital video monitor system shunting coding method in the embodiment of the invention.
Embodiment
Describe the embodiment of the invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, Fig. 1 shows the flow chart of the digital video monitor system shunting coding method in the embodiment of the invention, and this implementation is as follows:
S101: obtain frame of video a, i.e. frame of video in the digital video monitor system;
S102: handle by diverter module, promptly use two-dimensional wavelet transformation that frame of video a is decomposed into main frame of video and time frame of video;
S103: produce main frame of video b;
S104: by the main bit stream coding module main frame of video b is handled, promptly main frame of video is carried out encoding process here, produce main bit stream and main video reconstruction frames;
S105: produce main bit stream e;
S106: produce main video reconstruction frames d;
S107: produce time frame of video c;
S108: by inferior code stream coding module main video reconstruction frames d and time frame of video c are handled, promptly inferior frame of video is carried out encoding process, produce time code stream based on main video reconstruction frames;
Need to prove that the encoding process generation time code stream here mainly is based on main video reconstruction frames inferior frame of video is carried out coded prediction and fast coding, the fast coding here comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding.
S109: produce time code stream f.
Can seem thus, the embodiment of the invention resolves into main frame of video b and inferior frame of video c by the frame of video a with input; Secondly, main frame of video b is carried out encoding process, produce main bit stream e, and obtain main video reconstruction frames d; At last, inferior frame of video c is encoded, produce time code stream f based on main video reconstruction frames d.
State in realization after the flow process, need export needed code stream to this video monitoring terminal of video monitoring terminal, promptly the extra large resolution that needs to judge the video monitoring terminal in the whole proposal sends code stream according to the resolution judged result to the video monitoring terminal.Concrete, when judging the video monitoring terminal and be the equipment of low resolution demand, send main bit stream to described video monitoring terminal; When judging the video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to the video monitoring terminal.
After sending main bit stream and time code stream to the video monitoring terminal, this video monitoring terminal receives after main bit stream and time code stream, respectively main bit stream and time code stream is decoded, and decoded main bit stream and time code stream are carried out synthetic operation.
Based on above-mentioned implementation, the video monitoring system in the embodiment of the invention has comprised diverter module 201, main bit stream coding module 202 and inferior code stream coding module 203 or the like, as shown in Figure 2, and wherein:
The decomposition of 201 couples of frame of video a of diverter module is based on the two-dimensional wavelet transformation realization.As shown in Figure 3, F is a frame of video that size is W * H, through behind the two-dimensional wavelet transformation, will produce the sub-piece that four sizes are W/2 * H/2.Wherein the LL piece is the low frequency part of former frame of video F, will be as main frame of video, and other three (HL, LH, HH) then belong to HFS, are combined into time frame of video.
Decompose the main frame of video a that obtains and to produce main bit stream e through main bit stream coding module 202 codings.
The specific implementation of main bit stream coding module 202 can adopt the reasonable main flow technology of video compressing encoding of present encoding effect, as based on the technology of video compressing encoding of standard H.264.Certainly, also can use innovative video coding technique to realize.Main bit stream coding module 202 will produce main video reconstruction frames d simultaneously.
Inferior code stream coding module 203 is encoded to inferior frame of video c based on main video reconstruction frames d, and its coding work flow process as shown in Figure 4.As seen from Figure 4, the coding flow process of inferior code stream coding module 203 comprises two steps: predictive coding and fast coding.
The operation principle of predictive coding is based on main video reconstruction frames d inferior frame of video c is carried out the predictive coding processing, produces residual error h.The inferior frame of video of decomposing gained through two-dimensional wavelet transformation, the high frequency detail section that mainly comprises former frame of video, itself and low frequency part (promptly main frame of video) still have bigger correlation, so can compare effective prediction processing to inferior frame of video c based on main video reconstruction frames d.The realization of fast coding is then based on the validity of predictive coding, it is fewer to think that the contained detailed information amount of the resulting residual error h in back is handled in predictive coding, therefore, it is compared coarse encoding operation, visual quality infringement to original video image is very little, and is difficult for being discovered by human eye.
The handling process of fast coding comprises the steps: piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding, as shown in Figure 5.It is implemented as follows:
1) piecemeal: residual error h is divided into several pieces of 8 * 8;
2) DCT: each piece of 8 * 8 is carried out dct transform;
3) quantize: the piece to 8 * 8 behind each dct transform carries out quantification treatment;
4) delete letter: add up the number of contained nonzero value in the piece of each 8 * 8 after quantizing,, this piece of 8 * 8 is done complete zero handle, promptly reject a spot of nonzero value if number is less than setting threshold;
5) reorder: each piece of deleting 8 * 8 after the letter is reordered (as zigzag scanning), obtain the data that one dimension is arranged;
6) entropy coding: the data after reordering are carried out lossless compression-encoding.
Accordingly, Fig. 6 shows another structural representation of video monitoring system in the embodiment of the invention, comprising:
Main bit stream coding module 602 is used for main frame of video is carried out encoding process, produces main bit stream and main video reconstruction frames;
Inferior code stream coding module 603 is used for based on main video reconstruction frames inferior frame of video being carried out encoding process, produces time code stream; What inferior code stream coding module 604 was concrete carries out coded prediction and fast coding based on main video reconstruction frames to inferior frame of video, and wherein: fast coding comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding;
Further, this system also comprises a judging treatmenting module 604, this judging treatmenting module 604 mainly is based on transport network layer, input code flow is to the video monitoring terminal, this judging treatmenting module 604 mainly is the resolution that is used to judge the video monitoring terminal, and sends code stream according to the resolution judged result to the video monitoring terminal.Concrete, this judging treatmenting module 604 sends main bit stream to the video monitoring terminal when judging the video monitoring terminal and be the equipment of low resolution demand; Perhaps when judging the video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to the video monitoring terminal.
Further, when the video monitoring terminal in this system is the equipment of high-resolution demand, this system can also comprise a synthetic processing module 605, should synthetic processing module 605 also can directly be arranged in the video monitoring terminal, should synthetic processing module 605 be used for after the video monitoring terminal receives main bit stream and time code stream, respectively main bit stream and time code stream are decoded, and decoded main bit stream and time code stream are carried out synthetic operation.
Below will provide an a kind of simple embodiment who is used for the shunting coding method of digital video monitor system proposed by the invention, but these are described only is to understand a specific scheme that provides with the concrete the present invention of enforcement in order to enable those skilled in the art to, rather than limitation of the present invention.
As shown in Figure 7, Fig. 7 shows another flow chart of the digital video monitor system shunting coding method in the embodiment of the invention, and this method comprises:
S701: acquisition module is gathered frame of video a;
S702: coding module is handled frame of video a;
S703: produce main bit stream e;
S704: produce time code stream f;
S705: transport module carries out transmission process to data.
Shunting coding method in this flow process is implemented in the coding module in the digital video monitor system, and like this, the frame of video a that is collected by acquisition module just can produce main bit stream e and time code stream f through the processing of coding module.Main bit stream e and time code stream f then further send on the monitoring terminal equipment via transport module.
If the monitoring terminal equipment of low resolution demand then only needs to send main bit stream e.And, then to send main bit stream e and time code stream f simultaneously for the monitoring terminal equipment of high-resolution demand.
On the monitoring terminal equipment of low resolution demand, receive main bit stream e after, get final product direct decoding.
And on the monitoring terminal equipment of high-resolution demand, need after receiving main bit stream e and time code stream f, they to be decoded respectively, carry out synthetic operation then, just can obtain high-resolution frame of video.
Decode procedure can be regarded the reverse process of cataloged procedure as, and cataloged procedure has been described in detail, so decode procedure does not repeat them here.
To sum up, implement the present invention, can be so that the digital video monitor system of server end produces the primary and secondary video code flow, to satisfy the video monitoring demand of different resolution.Wherein, the main bit stream that coding produces can directly produce the video frame image of low resolution through decoding; And main bit stream and time code stream are decoded respectively after synthesizing again, and can produce high-resolution video frame image.Method proposed by the invention can improve the video image compression ratio, satisfies the Network Transmission requirement better.Video coding algorithm compared to direct employing high compression ratio is encoded to whole two field picture, and the strategy that shunting coding method of the present invention adopts is whole two field picture to be carried out 2-d wavelet decompose, and then further distinguishes coding.The main frame of video of decomposing gained through 2-d wavelet is the low frequency part of former frame of video, and this part is owing to removed the influence of detail of the high frequency preferably, can reflect the contact of interframe better, adopt the video coding algorithm of high compression ratio can access better compression effectiveness this moment.And the inferior frame of video of decomposing gained, the high frequency detail section that mainly comprises former frame of video, but itself and low frequency part (promptly main frame of video) still have bigger correlation, can reduce amount of information effectively so inferior frame of video is carried out predictive coding based on main video reconstruction frames, and then residual error compared coarse fast coding, can how not damage under the prerequisite of video image visual quality, improve the data compression ratio.Method proposed by the invention, be frame of video to be resolved into the primary and secondary frame of video distinguish coding again, seeming complexity and operand has all increased much, but in fact required operand is with directly similar to the required operand of the video coding algorithm of the high compression ratio of whole frame coding, even can further reduce on the contrary accepting or rejecting under the proper situation.This is because the operand of two-dimensional wavelet transformation only is proportional to video frame size, and is little to the influence of integral operation amount; Main frame of video is owing to size decreases, and required operand is about 1/4th of whole frame coding; And,, add more coarse fast coding if can adopt effective linear predictive coding to the coding of inferior frame of video, required operand also can solution in 3/4ths operands that whole frame is encoded, even can more save time.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. a digital video monitor system shunting coding method is characterized in that, comprising:
Use two-dimensional wavelet transformation that frame of video is decomposed into main frame of video and time frame of video;
Main frame of video is carried out encoding process, produce main bit stream and main video reconstruction frames;
Based on main video reconstruction frames inferior frame of video is carried out encoding process, produce time code stream.
2. the method for claim 1 is characterized in that, described method is carried out encoding process based on main video reconstruction frames to inferior frame of video and comprised:
Based on main video reconstruction frames inferior frame of video is carried out coded prediction and fast coding, wherein: described fast coding comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding.
3. the method for claim 1 is characterized in that, described method also comprises:
Judge the resolution of video monitoring terminal, send code stream to the video monitoring terminal according to the resolution judged result.
4. method as claimed in claim 3 is characterized in that, the resolution of described judgement video monitoring terminal sends code stream according to the resolution judged result to the video monitoring terminal and is specially:
When judging described video monitoring terminal and be the equipment of low resolution demand, send main bit stream to described video monitoring terminal;
When judging described video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to described video monitoring terminal.
5. method as claimed in claim 4 is characterized in that, described method also comprises:
After described video monitoring terminal receives main bit stream and time code stream, respectively main bit stream and time code stream are decoded, and decoded main bit stream and time code stream are carried out synthetic operation.
6. a video monitoring system is characterized in that, described video monitoring system comprises:
Diverter module is used to use two-dimensional wavelet transformation that frame of video is decomposed into main frame of video and time frame of video;
The main bit stream coding module is used for main frame of video is carried out encoding process, produces main bit stream and main video reconstruction frames;
Inferior code stream coding module is used for based on main video reconstruction frames inferior frame of video being carried out encoding process, produces time code stream.
7. system as claimed in claim 6, it is characterized in that, inferior code stream coding module in the described system is used for based on main video reconstruction frames inferior frame of video being carried out coded prediction and fast coding, and wherein: described fast coding comprises piecemeal, DCT, quantizes, deletes letter, reorders and entropy coding.
8. system as claimed in claim 6 is characterized in that described system also comprises a judging treatmenting module, is used to judge the resolution of video monitoring terminal, sends code stream according to the resolution judged result to the video monitoring terminal.
9. system as claimed in claim 8 is characterized in that, described judging treatmenting module is used for sending main bit stream to described video monitoring terminal when judging described video monitoring terminal and be the equipment of low resolution demand; Perhaps when judging described video monitoring terminal and be the equipment of high-resolution demand, send main bit stream and time code stream to described video monitoring terminal.
10. system as claimed in claim 9, it is characterized in that, described system also comprises a synthetic processing module, be used for after described video monitoring terminal receives main bit stream and time code stream, respectively main bit stream and time code stream are decoded, and decoded main bit stream and time code stream are carried out synthetic operation.
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