CN103974041A - Video period management method and device - Google Patents
Video period management method and device Download PDFInfo
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- CN103974041A CN103974041A CN201410206816.XA CN201410206816A CN103974041A CN 103974041 A CN103974041 A CN 103974041A CN 201410206816 A CN201410206816 A CN 201410206816A CN 103974041 A CN103974041 A CN 103974041A
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Abstract
The invention provides a video period management method which is applied to a video period management server. The method includes the steps that 1 after the video period management server reaches a preset time, I frame group data are read, whether the I frame group data comprise a corresponding movement information matrix A or not is judged, and if yes, the step 2 is executed; otherwise, the step 3 is executed, wherein an element Aij in the movement information matrix A corresponds to the movement changing situation of a corresponding block of a frame of image in an I frame group time; 2, whether an I frame group is retained or not is determined according to the element in the movement information matrix A and a preset retaining threshold; 3, a movement information matrix of the I frame group is calculated, and the step 2 is executed. According to the scheme, the movement information matrix is introduced in the video period management process, and therefore the video period management efficiency is extremely increased.
Description
Technical field
The present invention relates to technical field of video monitoring, relate in particular to a kind of video cycle management method and device.
Background technology
Along with the development of video monitoring, from SD to high definition, then from high definition to ultra high-definition video, the sharp increase of video storage amount.So current video monitoring system is had higher requirement to the storage of video: how to use the limited more macrocyclic video record of memory space storage? how to use the limited more useful video content of memory space storage? these problems manifest gradually in monitoring field of storage.
A kind of prior art is as follows: front end encoding device has motion detection function, and front end encoding device can only store the image interlock of motion in central storage device into.But the method is more intense to the dependence of headend equipment, if headend equipment does not have motion detection function, this scheme just cannot be implemented.
Another kind of existing scheme is: video frequency abstract server, one section of original video is carried out to the encoding and decoding again of the time and space, and reach the concentrated effect of video.Although the effect after concentrated is relatively good, but this scheme is consumption energy too, general 1 to 2 road 1080P video needs a server of configuration separately, so overall cost is higher than the cost of original increase memory device, so this scheme is only suitable for the video of set time length to concentrate, be not suitable for whole video data to carry out cycle management.
Summary of the invention
In view of this, the invention provides a kind of video cycle management method and device.
Method of the present invention, be applied to video cycle management server, the method comprises: step 1, video cycle management server read I frame group data after arriving Preset Time, judge whether these I frame group data have corresponding movable information matrix A, if so, go to step 2; Otherwise go to step 3; The wherein elements A in this movable information matrix A
ijthe motion change situation of the respective block of a corresponding two field picture within an I frame group time; Step 2, determine whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value; Step 3, calculate the movable information matrix of this I frame group, return to step 2.
Preferably, determining whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value is specially: if image setting is had to area-of-interest, judge whether the movable information matrix element that this area-of-interest is corresponding has at least an element to be greater than described default reservation threshold value, if so, retain this I frame group; Otherwise abandon this I frame group; If image setting is not had to area-of-interest, judge in all elements of described movable information matrix and whether have at least an element to be greater than described default reservation threshold value, if so, to retain this I frame group; Otherwise abandon this I frame group.
Preferably, in the time calculating the movable information matrix of this I frame group, the piece B after cutting apart with a two field picture
ijthe number of the picture element changing within an I frame group time is as the elements A of the movable information matrix A of this I frame group
ij; This two field picture is divided into m*n piece, and this movable information matrix comprises m*n element, each B
ijrespectively to an elements A in should movable information matrix
ij.
Preferably, in the time calculating movable information matrix,, more decoded data in video memory are carried out to compressed encoding obtain the I frame group data that resolution diminishes the I frame group decoding data reading by GPU; CPU carries out the movable information matrix computations to I frame group data in video memory.
Preferably, described default reservation threshold value is relevant to described Preset Time, and Preset Time is longer, and default reservation threshold value is larger.
A kind of video cycle management devices of the present invention, be applied to video cycle management server, this device comprises: movable information matrix is confirmed module, after arriving Preset Time at video cycle management server, read after I frame group data, judge whether these I frame group data have corresponding movable information matrix A, if so, retain judge module by I frame group and carry out the judgement whether I frame group retains; Otherwise calculate movable information matrix corresponding to I frame group by movable information matrix computations module; The wherein elements A in this movable information matrix A
ijthe motion change situation of the respective block of a corresponding two field picture within an I frame group time; I frame group retains judge module, for determining whether to retain this I frame group according to the element of movable information matrix A and default reservation threshold value; Movable information matrix computations module, for calculating the movable information matrix of this I frame group, and passes to I frame group reservation judge module execution judgement by the movable information matrix calculating.
Preferably, I frame group retains judge module and determines whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value and be specially: if image setting is had to area-of-interest, judge whether the movable information matrix element that this area-of-interest is corresponding has at least an element to be greater than described default reservation threshold value, if so, retain this I frame group; Otherwise abandon this I frame group; If image setting is not had to area-of-interest, judge in all elements of described movable information matrix and whether have at least an element to be greater than described default reservation threshold value, if so, to retain this I frame group; Otherwise abandon this I frame group.
Preferably, movable information matrix computations module in the time calculating the movable information matrix of this I frame group, the piece B after cutting apart with a two field picture
ijthe number of the picture element changing within an I frame group time is as the elements A of the movable information matrix A of this I frame group
ij; This two field picture is divided into m*n piece, and this movable information matrix comprises m*n element, each B
ijrespectively to an elements A in should movable information matrix
ij.
Compared to prior art, the solution of the present invention has been introduced movable information matrix in the process of video cycle management, has improved greatly the efficiency of video cycle management, in the utilance that ensures to have improved in key message is retained storage memory space; And can support user below the situation of not decoding, to carry out repeatedly the judgement whether video retains; And the solution of the present invention also supports user to carry out independent video cycle management to area-of-interest.
Brief description of the drawings
Fig. 1 is embodiment of the present invention flow chart.
Fig. 2 is that I frame chunk of the present invention is cut apart example.
Fig. 3 a～Fig. 3 d is movable information matrix example.
Fig. 4 is the video surveillance network schematic diagram of embodiment of the present invention application.
Fig. 5 is another movable information matrix example.
Fig. 6 is embodiment of the present invention device logical consequence figure.
Embodiment
The video cycle Managed Solution that the present invention proposes, carries out the cycle management of the video of storing on memory device by the form of newly-increased video management server, improve greatly the amount of video information in cycle and the unit storage of store video.Be embodied as example with software below and describe, but the present invention does not get rid of such as other implementations such as hardware or logical device.As shown in Figure 6, the hardware environment of this device operation generally includes CPU, internal memory, nonvolatile memory and other hardware.This device is as the virtual bench of a logic level, and it moves by CPU.This application of installation, in video cycle management server, comprises that movable information matrix confirmation module, I frame group retain judge module and movable information matrix computations module.
Please refer to the drawing 1, Fig. 1 is embodiment of the present invention flow chart.
S1, video cycle management server read I frame group data after arriving Preset Time, and movable information matrix confirms that module judges that whether these I frame group data have corresponding movable information matrix A, if so, turn S2; Otherwise turn S3; The wherein elements A in this movable information matrix A
ijthe motion change situation of the respective block of a corresponding two field picture within an I frame group time.
The time cycle that video cycle management server can arrange according to user carries out the reservation of original video stream or abandons.This time cycle can be the time interval of one week, January or other granularities.Once arrive after the time of setting, video cycle management server automatically performs the cycle management of video.In the time carrying out the cycle management of video, this video cycle management server reads I frame group data from memory device, and movable information matrix confirms that module judges whether the I frame group data that read have corresponding movable information matrix.Read I frame group data from memory device in, can read several I frame group data continuously, then judge respectively that whether each I frame group data are to there being movable information matrix.Here why carrying out the step of judgement, is to support the headend equipment that movable information matrix extracts and do not support the headend equipment that movable information matrix extracts because the headend equipment in video monitoring system comprises; Support the headend equipment that movable information matrix extracts just to send to together memory device to store in movable information matrix corresponding each I frame group when toward memory device, stores video flowing; What the headend equipment of not supporting movable information matrix to extract was stored on memory device is only video stream data and there is no movable information matrix information, and now video cycle management server just need to carry out the extraction of movable information matrix corresponding to each I frame group.The movable information matrix of the embodiment of the present invention is used for the motion change situation of token image.This movable information matrix has several elements, the motion change situation of the respective block of the corresponding two field picture of each element within an I frame group time.Such as elements A in this movable information matrix
ijrepresent the piece B in a two field picture
ijmotion change situation within an I frame group time.The concrete example calculation of movable information matrix will below elaborate.
S2, I frame group retain judge module and determine whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value.
In determining whether to retain I frame group, can there is multiple operation measure according to the element in movable information matrix A and default reservation threshold value.Such as, in the time that image setting is had to area-of-interest, can judge that whether the movable information matrix element that this area-of-interest is corresponding has at least an element to be greater than described default reservation threshold value, if so, retains this I frame group; Otherwise abandon this I frame group; Image setting is not being had to area-of-interest, judging in all elements of described movable information matrix and whether have at least an element to be greater than described default reservation threshold value, if so, to retain this I frame group; Otherwise abandon this I frame group.Have at least an element to be greater than default reservation threshold value and belong to preferably mode of one, if be in fact arranged to have at least two elements or three elements etc. to be also fine, this can arrange in conjunction with concrete situation in the time that reality is used.This default reservation threshold value can be the value relevant with time span.Such as Preset Time is one week, within one week, carries out the cycle management of primary video, a reservation threshold value can be set; Preset Time is January, carries out primary video cycle management January, another can be set and retain threshold value.The reservation threshold value that week age is corresponding is less than one month corresponding reservation threshold value conventionally.
Here the reservation in " determining whether to retain this I frame group " can be directly to retain I frame group, and the reservation of data not being compressed, can also be the reservation after data are compressed.
The movable information matrix that step 3, movable information matrix computations module are calculated this I frame group, returns to step 2.
In the time calculating the movable information matrix of this I frame group, the piece B after can cutting apart with a two field picture
ijthe number of the picture element changing within an I frame group time is as the elements A of the movable information matrix A of this I frame group
ij; Such as a two field picture is divided into m*n piece, this movable information matrix comprises m*n element, and each respectively to an element in should movable information matrix.In calculating the movable information matrix of this I frame group, can calculate respectively each frame in this frame group movable information matrix with respect to former frame, and then get the maximum of element of several matrix relevant positions that calculate or the weighted average value as the each element of movable information matrix of this I frame group.Give an example and describe below.Suppose that an I frame group has 5 frame of video, these 5 frame of video are 1 I frame and 4 P frames; Suppose that each frame of video is divided into 9 blocks, please refer to the drawing 2 in the same manner; Calculate respectively the number that the pixel in each of first P frame P1 changes with respect to the picture element in the relevant block of I frame, the number that picture element in the piece i of P1 frame changes with respect to the picture element in I frame piece i, i equals respectively 1～9.After having calculated like this, just obtain the matrix M oveValue_P1 of a 3*3, the each element in this matrix represents respectively the number that relevant block picture element changes, please refer to the drawing 3a.Similarly, calculate respectively the number that the pixel in each of second P frame P2 changes with respect to the picture element in the relevant block of P1 frame, obtain matrix M oveValue_P2, please refer to the drawing 3b; Calculate respectively the number that the pixel in each of the 3rd P frame P3 changes with respect to the picture element in the relevant block of P2 frame, obtain matrix M oveValue_P3, please refer to the drawing 3c; Calculate respectively the number that the pixel in each of the 4th P frame P4 changes with respect to the picture element in the relevant block of P3 frame, obtain matrix M oveValue_P4, please refer to the drawing 3d.
Obtaining after the movable information matrix of each frame in I frame group with respect to former frame, can get the maximum of element of matrix relevant position or the weighted average value as the each element of movable information matrix of this I frame group.For above-mentioned example, the capable j column element of the movable information matrix i A of the I frame group finally obtaining
ij, can be a
ij, b
ij, c
ij, d
ijmaximum, or their weighted average.
In above-mentioned example, if know the data of last frame in an I frame group before the I frame group of current calculating, can also obtain I frame in the I frame group of the current calculating movable information matrix M oveValue_I with respect to the last frame of previous I frame group, thereby in the time calculating the movable information matrix of I frame group, consider matrix M oveValue_I.
The algorithm of certain above-mentioned calculating I frame group movable information matrix is only an example of the present invention, and except this algorithm, other can represent that the big or small algorithm of piece motion change can be used for calculating the movable information matrix of I frame group.
Video cycle management server, in the time calculating the movable information matrix of I frame group, can first be decoded to the video data reading from memory device by GPU, and decoded Video Data Storage is in video memory; GPU carries out compressed encoding to the decoded data in video memory again and obtains the video data that resolution is little; Then CPU carries out the calculating of movable information matrix to the I frame group data of the little resolution in video memory.The large motion change information of each piece of resolution frame and the motion change information of each piece of little resolution frame are identical, so the calculating that CPU carries out movable information matrix to the I frame group of the little resolution in video memory can't bring any difference in result.Experiment is proof also, and the image of 1080P comes to the same thing the extraction of carrying out movable information matrix after 100,000 pixels of 2,000,000 pixel boil down to CIF through overcompression with the extraction that adopts original video to carry out movable information matrix.The collaborative work of GPU and CPU, makes the performance that obtains movable information matrix reach optimum effect.If image itself belongs to non-high definition certainly, that also can directly calculate by CPU the movable information matrix that obtains each frame group.
Carry out simple declaration embodiment of the present invention scheme once below in conjunction with the video surveillance network schematic diagram of Fig. 4.Monitoring frontend, as the encoder that web camera IPC is connected with analog video camera is stored being transferred to memory device by IP network after the video compression coding of shooting.The video flowing of storing on memory device is used for checking for subsequent playback.If monitoring frontend has the function that movable information matrix extracts, monitoring frontend can be stored being transferred to memory device for the movable information matrix of I frame group extraction together with video code flow, when this movable information Transfer-matrix, can leave in proprietary protocol.If this movable information matrix comprises n*m element, for each I frame group data, these I frame group data only increase n*m byte.Here monitoring frontend carries out method that movable information matrix corresponding to I frame group extract and can extract with reference to video cycle management server above the method for movable information matrix.If this monitoring frontend does not have the function that movable information matrix extracts, monitoring frontend as prior art by the Video Data Storage after compressed encoding on memory device.
If user has set the cycle management that carries out weekly primary video, video cycle management server just goes to read on memory device I frame group data after week age arriving, and is retain this I frame group or abandon this I frame group according to its movable information matrix judgement.Suppose the movable information matrix of some I frame groups as shown in Figure 5, and the reservation threshold value that week age is corresponding is 5, video cycle management server can travel through each element in this movable information matrix, if there is the element that is greater than 5, represent that current I frame group need to be saved, otherwise just abandon.So the I frame group that Fig. 5 movable information matrix is corresponding need to be saved.I frame group corresponding to this movable information matrix if also having set the value of carrying out neither one element in movable information matrix that the reservation threshold value of primary video cycle management is 20, Fig. 5 for month simultaneously, user be greater than 20, so will be dropped in one month.
If be provided with interested, only need to judge whether interested element in corresponding movable information matrix is greater than reservation threshold value.Or with the example explanation of Fig. 5, if Centromedian of image is interested, as long as judge the entry of a matrix element that this block is corresponding, whether the element 10 of the 2nd row the 2nd row is greater than reservation threshold value.
In addition, it should be noted that, the extraction of movable information matrix only needs once.Such as in above-mentioned example, if video cycle management server has carried out the extraction of movable information matrix in week age, in one month, can directly use this movable information matrix having extracted to carry out the reservation of its corresponding I frame group or the judgement abandoning in conjunction with corresponding threshold value.
The solution of the present invention has been introduced movable information matrix in the process of video cycle management, can support user below the situation of not decoding, to carry out repeatedly the judgement whether video retains.And the solution of the present invention supports user to carry out independent video cycle management to area-of-interest.The present invention program has improved the efficiency of video cycle management greatly, in the utilance that ensures to have improved in key message is retained storage memory space.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. a video cycle management method, is applied to video cycle management server, it is characterized in that, the method comprises:
Step 1, video cycle management server read I frame group data after arriving Preset Time, judge that whether these I frame group data have corresponding movable information matrix A, if so, go to step 2; Otherwise go to step 3; The wherein elements A in this movable information matrix A
ijthe motion change situation of the respective block of a corresponding two field picture within an I frame group time;
Step 2, determine whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value;
Step 3, calculate the movable information matrix of this I frame group, return to step 2.
2. the method for claim 1, is characterized in that, determines whether to retain this I frame group be specially according to the element in movable information matrix A and default reservation threshold value:
If image setting is had to area-of-interest, judge that whether the movable information matrix element that this area-of-interest is corresponding has at least an element to be greater than described default reservation threshold value, if so, retains this I frame group; Otherwise abandon this I frame group;
If image setting is not had to area-of-interest, judge in all elements of described movable information matrix and whether have at least an element to be greater than described default reservation threshold value, if so, to retain this I frame group; Otherwise abandon this I frame group.
3. the method for claim 1, is characterized in that, in the time calculating the movable information matrix of this I frame group, and the piece B after cutting apart with a two field picture
ijthe number of the picture element changing within an I frame group time is as the elements A of the movable information matrix A of this I frame group
ij; This two field picture is divided into m*n piece, and this movable information matrix comprises m*n element, each B
ijrespectively to an elements A in should movable information matrix
ij.
4. the method for claim 1, is characterized in that, in the time calculating movable information matrix,, more decoded data in video memory are carried out to compressed encoding obtains the I frame group data that resolution diminishes the I frame group decoding data reading by GPU; CPU carries out the movable information matrix computations to I frame group data in video memory.
5. the method for claim 1, is characterized in that, described default reservation threshold value is relevant to described Preset Time, and Preset Time is longer, and default reservation threshold value is larger.
6. a video cycle management devices, is applied to video cycle management server, it is characterized in that, this device comprises:
Movable information matrix is confirmed module, after arriving Preset Time at video cycle management server, read after I frame group data, judge whether these I frame group data have corresponding movable information matrix A, if so, retain judge module by I frame group and carry out the judgement whether I frame group retains; Otherwise calculate movable information matrix corresponding to I frame group by movable information matrix computations module; The wherein elements A in this movable information matrix A
ijthe motion change situation of the respective block of a corresponding two field picture within an I frame group time;
I frame group retains judge module, for determining whether to retain this I frame group according to the element of movable information matrix A and default reservation threshold value;
Movable information matrix computations module, for calculating the movable information matrix of this I frame group, and passes to I frame group reservation judge module execution judgement by the movable information matrix calculating.
7. device as claimed in claim 6, is characterized in that, I frame group retains judge module and determines whether to retain this I frame group according to the element in movable information matrix A and default reservation threshold value and be specially:
If image setting is had to area-of-interest, judge that whether the movable information matrix element that this area-of-interest is corresponding has at least an element to be greater than described default reservation threshold value, if so, retains this I frame group; Otherwise abandon this I frame group;
If image setting is not had to area-of-interest, judge in all elements of described movable information matrix and whether have at least an element to be greater than described default reservation threshold value, if so, to retain this I frame group; Otherwise abandon this I frame group.
8. device as claimed in claim 6, is characterized in that, movable information matrix computations module in the time calculating the movable information matrix of this I frame group, the piece B after cutting apart with a two field picture
ijthe number of the picture element changing within an I frame group time is as the elements A of the movable information matrix A of this I frame group
ij; This two field picture is divided into m*n piece, and this movable information matrix comprises m*n element, each B
ijrespectively to an elements A in should movable information matrix
ij.
9. device as claimed in claim 6, is characterized in that, in the time calculating movable information matrix,, more decoded data in video memory are carried out to compressed encoding obtains the I frame group data that resolution diminishes the I frame group decoding data reading by GPU; CPU carries out the movable information matrix computations to I frame group data in video memory.
10. device as claimed in claim 6, is characterized in that, described default reservation threshold value is relevant to described Preset Time, and Preset Time is longer, and default reservation threshold value is larger.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101060624A (en) * | 2007-05-08 | 2007-10-24 | 杭州华三通信技术有限公司 | Video data processing method and storage equipment |
| CN101902631A (en) * | 2009-05-26 | 2010-12-01 | 北京风格九州文化传播有限公司 | Method for rapidly positioning static scene in compressed video |
| JP2012142865A (en) * | 2011-01-05 | 2012-07-26 | Sony Corp | Image processing apparatus and image processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060624A (en) * | 2007-05-08 | 2007-10-24 | 杭州华三通信技术有限公司 | Video data processing method and storage equipment |
| CN101902631A (en) * | 2009-05-26 | 2010-12-01 | 北京风格九州文化传播有限公司 | Method for rapidly positioning static scene in compressed video |
| JP2012142865A (en) * | 2011-01-05 | 2012-07-26 | Sony Corp | Image processing apparatus and image processing method |
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