CN103974041B - A kind of video cycle management method and device - Google Patents
A kind of video cycle management method and device Download PDFInfo
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Abstract
The present invention provides a kind of video cycle management method, is applied to video cycle management server, and this method includes：Step 1, video cycle management server read I frame group data after reaching preset time, judge whether the I frame group data have corresponding movable information matrix A, if so, going to step 2；Otherwise 3 are gone to step；Elements A ij wherein in the movable information matrix A corresponds to motion change situation of the respective block of a frame image within an I frame group times；Step 2, according in movable information matrix A element and preset reservation threshold value determine whether to retain the I frame groups；Step 3, the movable information matrix for calculating the I frame groups, return to step 2.The solution of the present invention introduces movable information matrix during video cycle management, greatly improves the efficiency of video cycle management.
Description
Technical field
The present invention relates to technical field of video monitoring more particularly to a kind of video cycle management method and devices.
Background technology
With the development of video monitoring, from SD to high definition, then from high definition to ultra high-definition video, video amount of storage drastically increases
It is long.So more stringent requirements are proposed for storage of the current video monitoring system to video：How limited memory space is used
The more macrocyclic video record of storageHow more useful video content is stored using limited memory spaceThese problems exist
Monitoring field of storage gradually shows.
A kind of prior art is as follows：There is front end encoding device motion detection function, front end encoding device will can only transport
In dynamic image linkage storage to central storage device.But this method is stronger to the dependence of headend equipment, if front end
Equipment does not have motion detection function, and the program can not just be implemented.
Another currently existing scheme is：One section of original video is carried out the time and space again by video frequency abstract server
Encoding and decoding reach the concentrated effect of video.Although concentration after effect it is relatively good, this scheme too consumption energy, general 1 to
2 road 1080P videos need that a server is separately configured, so cost higher of the overall cost than originally increasing storage device,
So the program is only suitable for concentrating the video of set time length, be not suitable for carrying out period pipe to entire video data
Reason.
Invention content
In view of this, a kind of video cycle management method of present invention offer and device.
The method of the present invention, is applied to video cycle management server, and this method includes：Step 1, video cycle management clothes
It is engaged in reading I frame group data after device reaches preset time, judges whether the I frame group data have corresponding movable information matrix A, if
It is to go to step 2；Otherwise 3 are gone to step；Elements A wherein in the movable information matrix AijThe respective block of a corresponding frame image exists
Motion change situation in one I frame group time；Step 2, according in movable information matrix A element and preset reservation threshold
Value determines whether to retain the I frame groups；Step 3, the movable information matrix for calculating the I frame groups, return to step 2.
Preferably, according in movable information matrix A element and preset reservation threshold value determine whether to retain the I frame groups
Specially：If being provided with area-of-interest to image, judge that the corresponding movable information matrix element of the area-of-interest is
At least one no element is more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned；
If not being provided with area-of-interest to image, judge in all elements of the movable information matrix whether at least one
Element is more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned.
Preferably, when calculating the movable information matrix of the I frame groups, with the block B after a frame image segmentationijIn an I frame
Elements A of the number of the picture element changed in the group time as the movable information matrix A of the I frame groupsij；The one frame image segmentation is
M*n blocks, the movable information matrix include m*n element, each block BijAn element in the movable information matrix is corresponded to respectively
Aij。
Preferably, when calculating movable information matrix, the I frame group data of reading are decoded by GPU, then in video memory
Decoded data carry out compressed encoding and obtain the I frame group data that resolution ratio becomes smaller；CPU is executed to I frames group data in video memory
Movable information matrix calculates.
Preferably, the preset reservation threshold value is related to the preset time, and preset time is longer, then presets and retain threshold
Value is bigger.
A kind of video cycle managing device of the present invention, is applied to video cycle management server, which includes：Movement
Information matrix confirmation module, for after reading I frame group data after video cycle management server reaches preset time, judging should
Whether I frame group data have corresponding movable information matrix A, retain if it is, retaining judgment module by I frame groups and executing I frame groups
Whether judgement；Otherwise the corresponding movable information matrix of I frame groups is calculated by movable information matrix computing module；Wherein the movement is believed
Cease the elements A in matrix AijMotion change situation of the respective block of a corresponding frame image within an I frame group times；I frame groups
Retain judgment module, for according in movable information matrix A element and preset reservation threshold value determine whether to retain the I frames
Group；Movable information matrix computing module, the movable information matrix for calculating the I frame groups, and the movable information that will be calculated
Matrix algebraic eqation retains judgment module to I frame groups and executes judgement.
Preferably, I frames group retain judgment module according in movable information matrix A element and preset reservation threshold value it is true
Whether retaining the I frame groups calmly is specially：If being provided with area-of-interest to image, the corresponding fortune of the area-of-interest is judged
Whether at least one element is more than the preset reservation threshold value to dynamic information matrix element, if it is, retaining the I frame groups；
Otherwise the I frame groups are abandoned；If not being provided with area-of-interest to image, all elements of the movable information matrix are judged
In whether at least one element be more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frames are abandoned
Group.
Preferably, movable information matrix computing module is when calculating the movable information matrix of the I frame groups, with a frame image point
Block B after cuttingijElement of the number of the picture element changed within an I frame group times as the movable information matrix A of the I frame groups
Aij；The one frame image segmentation is m*n blocks, which includes m*n element, each block BijThe movement is corresponded to respectively
An elements A in information matrixij。
Compared to the prior art, the solution of the present invention introduces movable information matrix during video cycle management,
The efficiency for greatly improving video cycle management improves memory space while ensureing that key message is retained storage
Utilization rate；And judgement whether user can be supported to carry out multiple video reservation below without decoded situation；And
The solution of the present invention also supports user to carry out individual video cycle management to area-of-interest.
Description of the drawings
Fig. 1 is flow chart of the embodiment of the present invention.
Fig. 2 is I frames chunking segmentation example of the present invention.
Fig. 3 a~Fig. 3 d are movable information matrix examples.
Fig. 4 is the video surveillance network schematic diagram of application of the embodiment of the present invention.
Fig. 5 is another movable information matrix example.
Fig. 6 is device logical consequence figure of the embodiment of the present invention.
Specific implementation mode
Video cycle Managed Solution proposed by the present invention is set by increasing the form of video management server newly to carry out storage
The cycle management of the video of standby upper storage, the period for greatly improving storage video and the amount of video information in unit storage.With
Under it is implemented in software for illustrate, but other realization sides such as hardware or logical device are not precluded in the present invention
Formula.As shown in fig. 6, the hardware environment of device operation generally includes CPU, memory, nonvolatile memory and other hardware.
Virtual bench of the device as a logic level, is run by CPU.The device is applied to video cycle management service
Device, including movable information matrix confirmation module, I frame groups retain judgment module and movable information matrix computing module.
It please join Fig. 1, Fig. 1 is flow chart of the embodiment of the present invention.
S1, video cycle management server read I frame group data, movable information matrix confirmation module after reaching preset time
Judge whether the I frame group data have corresponding movable information matrix A, if so, turning S2；Otherwise turn S3；The wherein movable information
Elements A in matrix AijMotion change situation of the respective block of a corresponding frame image within an I frame group times.
Video cycle management server can according to the time cycle of user setting carry out original video stream reservation or
It abandons.The time cycle can be one week, the time interval of January or other granularities.After the time for reaching setting, depending on
Frequency cycle management server executes the cycle management of video automatically.When executing the cycle management of video, the video cycle management
Server reads I frame group data from storage device, and movable information matrix confirmation module judges whether the I frame group data read have
Corresponding movable information matrix.When reading I frame group data from storage device, several continuous I frame groups can be read
Data, then judge whether each I frames group data are corresponding with movable information matrix respectively.Here the step of judgement why is executed
Suddenly, it is because the headend equipment in video monitoring system includes supporting the headend equipment of movable information matrix extraction and not supporting to transport
The headend equipment of dynamic information matrix extraction；The headend equipment of movable information matrix extraction is supported to store video flowing toward storage device
When stored with regard to each corresponding movable information matrix of I frame groups is sent jointly to storage device；It does not support to transport
What the headend equipment of dynamic information matrix extraction stored on a storage device is only then video stream data without movable information matrix
Information, at this time video cycle management server just need to carry out the extraction of the corresponding movable information matrix of each I frames group.The present invention is real
The movable information matrix for applying example is used for characterizing the motion change situation of image.The movable information matrix has several elements, often
A element corresponds to motion change situation of the respective block of a frame image within an I frame group times.Such as the movable information
Elements A in matrixijIndicate the block B in a frame imageijMotion change situation within an I frame group times.Movable information square
The specific example calculation of battle array will be described in more detail below.
S2, I frame group retain judgment module according in movable information matrix A element and preset reservations threshold value determine be
No reservation I frame groups.
According in movable information matrix A element and preset reservation threshold value determine whether retain I frame groups when,
It can be there are many operation measure.Such as when being provided with area-of-interest to image, then the area-of-interest pair is may determine that
Whether at least one element is more than the preset reservation threshold value to the movable information matrix element answered, if it is, retaining the I
Frame group；Otherwise the I frame groups are abandoned；Area-of-interest be not provided with to image, then is judging all of the movable information matrix
Whether at least one element is more than the preset reservation threshold value in element, if it is, retaining the I frame groups；Otherwise it abandons
The I frame groups.At least one element belongs to a kind of preferably mode more than preset reservation threshold value, actually if be arranged to
Few also possible there are two element or three elements etc., this can be set in conjunction with particular situation in actual use
It sets.The preset reservation threshold value can be and the relevant value of time span.Such as preset time is one week, i.e., executes one within one week
A reservation threshold value can be then arranged in the cycle management of secondary video；Preset time is January, i.e., executes primary video period pipe January
Reason, then can be arranged another reservation threshold value.The corresponding reservation threshold value of week age is usually less than one month corresponding reservation threshold
Value.
Here the reservation in " determining whether to retain the I frames group " can be direct reservation I frame groups, i.e., do not press data
The reservation of contracting can also be and carry out compressed reservation to data.
Step 3, movable information matrix computing module calculate the movable information matrix of the I frame groups, return to step 2.
It, can be with the block B after a frame image segmentation when calculating the movable information matrix of the I frame groupsijIn an I frame group
Elements A of the number of the picture element of interior variation as the movable information matrix A of the I frame groupsij；Such as a frame image segmentation is
M*n blocks, then the movable information matrix includes m*n element, and each block corresponds to an element in the movable information matrix respectively.
When calculating the movable information matrix of the I frame groups, each frame in the frame group can be calculated separately relative to former frame
Then movable information matrix takes the maximum value or weighted average of the element for several matrix corresponding positions being calculated again
The value of movable information matrix each element as the I frame groups.It for example illustrates below.Assuming that an I frame group has 5 to regard
Frequency frame, 5 video frame are 1 I frame and 4 P frames；Assuming that each video frame is divided into 9 blocks in the same manner, Fig. 2 please be join；
Calculate separately the number that each pixel in the block of first P frames P1 changes relative to the corresponding picture element in the block of I frames, i.e. P1
Number of the picture element relative to the picture element variation in I frame blocks i in the block i of frame, i are respectively equal to 1~9.It calculates and completes in this way
The matrix MoveValue_P1 of a 3*3 is just obtained afterwards, and each element in the matrix indicates that relevant block picture element changes respectively
Number, Fig. 3 a please be join.Similarly, relevant block of each pixel in the block of second P frames P2 relative to P1 frames is calculated separately
In picture element variation number, obtain matrix MoveValue_P2, Fig. 3 b please be join；Calculate separately each piece of third P frames P3
In pixel relative to P2 frames corresponding picture element in the block variation number, obtain matrix MoveValue_P3, figure please be join
3c；The number that each pixel in the block of the 4th P frames P4 changes relative to the corresponding picture element in the block of P3 frames is calculated separately,
Matrix MoveValue_P4 is obtained, Fig. 3 d please be join.
After each frame in obtaining an I frame group is relative to the movable information matrix of former frame, matrix can be taken corresponding
Value of the maximum value or weighted average of the element of position as the movable information matrix each element of the I frame groups.For above-mentioned
Example, movable information matrix the i-th row jth column element A of the I frame groups finally obtainedij, can be aij、bij、cij、dijMaximum
Value or their weighted average.
In the above example, knowing how in an I frame group before the I frame groups currently calculated last frame data,
The movable information matrix of I frames in the I frame groups that then can also be currently calculated relative to the last frame of previous I frames group
MoveValue_I, to consider matrix MoveValue_I when calculating the movable information matrix of I frame groups.
The algorithm of certain above-mentioned calculating I frames group movable information matrix is only the example of the present invention, in addition to the algorithm,
He can indicate that the algorithm of the size of block motion change may serve to calculate the movable information matrix of I frame groups.
Video cycle management server, can be first by GPU to from storage device when calculating the movable information matrix of I frame groups
The video data of upper reading is decoded, and decoded video data is stored in video memory；GPU is again to the decoding data in video memory
It carries out compressed encoding and obtains the small video data of resolution ratio；Then CPU transports the I frame group data of the small resolution ratio in video memory
The calculating of dynamic information matrix.Each piece of movement of each piece of the motion change information and small resolution frame of big resolution frame becomes
It is identical to change information, so the calculating that CPU carries out the I frame groups of the small resolution ratio in video memory in movable information matrix can't band
Carry out any difference in result.Experiment also turns out, the image of 1080P is through overcompression by the 100000 of 2,000,000 pixel boil down to CIF
The extraction that movable information matrix is carried out after pixel is identical as the extraction result of movable information matrix is carried out using original video.GPU
With the collaborative work of CPU so that obtain the effect that the performance of movable information matrix is optimal.If certain image itself belongs to
Non- high definition, that can also directly be carried out calculating the movable information matrix for obtaining each frame group by CPU.
The embodiment of the present invention is briefly described below in conjunction with the video surveillance network schematic diagram of Fig. 4.Before monitoring
End equipment, the encoder as web camera IPC is connected with analog video camera will pass through IP network after the video compression coding of shooting
Network is transferred to storage device and is stored.The video flowing stored in storage device is used for checking for subsequent playback.If before monitoring
End equipment has the function of the extraction of movable information matrix, the then movable information that monitoring frontend can will be extracted for I frame groups
Matrix and video code flow are transferred to storage device and are stored together, and movable information Transfer-matrix when can be stored in private
Have in agreement.If the movable information matrix includes n*m element, for each I frame group data, the I frame group numbers
According to only n*m byte of increase.Here the method that monitoring frontend carries out the corresponding movable information matrix extraction of I frame groups can join
The method for extracting movable information matrix according to video cycle management server above.If the monitoring frontend does not have movement
Information matrix extraction function, then monitoring frontend as in the prior art only the video data after compressed encoding is stored in
In storage device.
If user sets the cycle management for carrying out primary video weekly, video cycle management server reaches one
Just gone after week in storage device read I frame group data, and according to its movable information matrix judgement be retain the I frames group or
Abandon the I frame groups.Assuming that the movable information matrix of some I frame group is as shown in figure 5, and the corresponding reservation threshold value of week age
It is 5, then video cycle management server can traverse each element in the movable information matrix, if there is more than 5
Element, then it represents that current I frame groups needs are saved, and are otherwise just abandoned.So the corresponding I frames group of Fig. 5 movable information matrixes needs
It is saved.If user also sets the fortune that the reservation threshold value that one month carries out primary video cycle management is 20, Fig. 5 simultaneously
The value of no one of dynamic information matrix element is more than 20, thus the corresponding I frames group of the movable information matrix one month when
Time will be dropped.
If being provided with interested piece, only need to judge whether is element in interested piece of corresponding movable information matrix
More than reservation threshold value.Or illustrated with the example of Fig. 5, it, should as long as judging if the block of image centre is interested piece
Whether the element 10 of the element of the corresponding matrix of block, i.e. the 2nd row the 2nd row, which is more than, retains threshold value.
In addition, it is necessary to which explanation, the extraction of movable information matrix only need once.Such as in above-mentioned example, video
If the extraction that cycle management server has carried out movable information matrix when week age can when one month
The reservation of I frame groups or discarding are corresponded to directly to use the extracted movable information matrix that corresponding threshold value is combined to carry out it
Judge.
The solution of the present invention introduces movable information matrix during video cycle management, user can be supported not
Judgement whether multiple video reservation is carried out below the case where being decoded.And the solution of the present invention supports user to interested
Region carries out individual video cycle management.The present invention program greatly improves the efficiency of video cycle management, is ensureing to close
Key information is retained the utilization rate that memory space is improved while storage.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (8)
1. a kind of video cycle management method, it is applied to video cycle management server, which is characterized in that this method includes：
Step 1, video cycle management server read I frame group data after reaching preset time, judge whether the I frame group data have
Corresponding movable information matrix, if so, going to step 2；Otherwise 3 are gone to step；Elements A wherein in the movable information matrixijIt is right
Answer motion change situation of the respective block of a frame image within an I frame group times；
Step 2, according in movable information matrix element and preset reservation threshold value determine whether to retain the I frame groups；
Step 3, the movable information matrix for calculating the I frame groups, return to step 2；
According in movable information matrix element and preset reservation threshold value determine whether that retaining the I frame groups is specially：
If being provided with area-of-interest to image, whether extremely the corresponding movable information matrix element of the area-of-interest is judged
Few there are one elements to be more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned；
If not being provided with area-of-interest to image, whether at least to judge in all elements of the movable information matrix
One element is more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned.
2. the method as described in claim 1, which is characterized in that when calculating the movable information matrix of the I frame groups, with a frame figure
As the block B after segmentationijThe movable information matrix of the number of the picture element changed within an I frame group times as the I frame groups
Elements Aij；The one frame image segmentation is m*n blocks, which includes m*n element, each block BijIt is corresponding respectively to be somebody's turn to do
An elements A in movable information matrixij。
3. the method as described in claim 1, which is characterized in that when calculating movable information matrix, by GPU to the I frames of reading
Group data are decoded, then are carried out compressed encoding to decoded data in video memory and obtained the I frame group data that resolution ratio becomes smaller；
CPU, which is executed, calculates the movable information matrix of I frames group data in video memory.
4. the method as described in claim 1, which is characterized in that the preset reservation threshold value is related to the preset time,
Preset time is longer, then it is bigger to preset reservation threshold value.
5. a kind of video cycle managing device, it is applied to video cycle management server, which is characterized in that the device includes：
Movable information matrix confirmation module, for reading I frame group data after video cycle management server reaches preset time
Afterwards, judge whether the I frame group data have corresponding movable information matrix, if it is, retaining judgment module by I frame groups executes I
Judgement whether frame group retains；Otherwise the corresponding movable information matrix of I frame groups is calculated by movable information matrix computing module；Wherein
Elements A in the movable information matrixijMotion change feelings of the respective block of a corresponding frame image within an I frame group times
Condition；
I frame groups retain judgment module, for according in movable information matrix element and preset reservation threshold value determine whether
Retain the I frame groups；
Movable information matrix computing module, the movable information matrix for calculating the I frame groups, and the movable information that will be calculated
Matrix algebraic eqation retains judgment module to I frame groups and executes judgement；
I frame groups retain judgment module according in movable information matrix element and preset reservations threshold value determine whether retain this
I frame groups are specially：
If being provided with area-of-interest to image, whether extremely the corresponding movable information matrix element of the area-of-interest is judged
Few there are one elements to be more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned；
If not being provided with area-of-interest to image, whether at least to judge in all elements of the movable information matrix
One element is more than the preset reservation threshold value, if it is, retaining the I frame groups；Otherwise the I frame groups are abandoned.
6. device as claimed in claim 5, which is characterized in that movable information matrix computing module is in the fortune for calculating the I frame groups
When dynamic information matrix, with the block B after a frame image segmentationijThe number of the picture element changed within an I frame group times is as the I
The elements A of the movable information matrix of frame groupij；The one frame image segmentation is m*n blocks, which includes m*n element,
Each block BijAn elements A in the movable information matrix is corresponded to respectivelyij。
7. device as claimed in claim 5, which is characterized in that when calculating movable information matrix, by GPU to the I frames of reading
Group data are decoded, then are carried out compressed encoding to decoded data in video memory and obtained the I frame group data that resolution ratio becomes smaller；
CPU, which is executed, calculates the movable information matrix of I frames group data in video memory.
8. device as claimed in claim 5, which is characterized in that the preset reservation threshold value is related to the preset time,
Preset time is longer, then it is bigger to preset reservation threshold value.
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