CN107071337A - The transmission method and device of a kind of video monitoring image - Google Patents
The transmission method and device of a kind of video monitoring image Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
Abstract
The invention discloses a kind of transmission method of video monitoring image and device, by the foreground image and background image that extract video monitoring image, the background image extracted is compared with the background image in currently used background image or background image list, selection compares the background image of obtained threshold value of the difference less than setting as corresponding background image from the background image in currently used background image or background image list, when comparing obtained difference more than or equal to the threshold value set, by the background image extracted directly as corresponding background image, and add it in background image list, the numbering of the foreground image of video monitoring image and corresponding background image in background image list is finally sent to rear end equipment.The inventive system comprises image zooming-out module, comparing module and sending module.The method and device of the present invention reduces the flow bandwidth taken during transmission, and reduces memory space.
Description
Technical field
The invention belongs to the transmission method and device of field of video monitoring, more particularly to a kind of video monitoring image.
Background technology
With the development of Video Supervision Technique, the intelligent monitoring realized by video camera is got in fields such as intelligent transportation
To be more widely applied, for example, being captured by video camera to the vehicle of restricted driving, the vehicle made a dash across the red light is entered by video camera
Row is captured, and the vehicle that driver does not fasten the safety belt is captured etc. by video camera.The implementation method of intelligent monitoring is：Taking the photograph
Corresponding intelligent rules are set on camera, when monitoring range of the moving object by video camera, and triggers after intelligent rules, takes the photograph
Camera is captured to the moving object, and then video camera reports the image of the intelligent event and candid photograph the service of rear end
Device is analyzed and processed.
For example, being captured by video camera to the vehicle made a dash across the red light, the intelligent rules that video camera is set are：When traffic letter
When signal lamp is red light, if candid photograph trigger winding of the vehicle by video camera, then the vehicle is captured.Therefore, car is worked as
The intelligent rules made a dash across the red light of triggering, i.e., when signal lamp is red light, vehicle passes through the candid photograph trigger winding of the video camera, images
Machine will be captured to the vehicle, and the license plate number analyzed by the image of candid photograph and from the image of candid photograph is sent to
The server of rear end.
The image captured can be transmitted directly to back-end services by video camera when reporting the image of candid photograph in the prior art
Device, due to video capture to image in, the background of image is identical when most of, and different simply triggers intelligence rule
Moving object (for example, the vehicle made a dash across the red light) then, therefore the image captured is transmitted directly to the service of rear end by video camera
Device, takes the substantial amounts of network bandwidth, and back-end server is existed when the image of video capture can be caused to transmit in an ip network
, it is necessary to take substantial amounts of memory space during the image that preservation is captured.
The content of the invention
It is an object of the invention to provide a kind of transmission method of video monitoring image and device, by being shot from headend equipment
Video monitoring image in extract foreground image and background image, and generate and safeguard a background image list, make front end
The numbering of foreground image and background image is only sent to rear end equipment by equipment in most cases, only from headend equipment
When the background image that captured video monitoring image is extracted is all different from all background images that headend equipment is recorded, just will
Foreground image and background image are all sent to back-end server, so as to reduce video monitoring image captured by headend equipment in IP
The flow bandwidth taken when being transmitted in network, and reduce the video monitoring image captured by headend equipment on back-end server
Memory space.
To achieve these goals, technical solution of the present invention is as follows：
A kind of transmission method of video monitoring image, applied to the headend equipment in video monitoring system, the video prison
The transmission method of image is controlled, including：
Extract the foreground image and background image in video monitoring image；
Background image in the background image extracted and currently used background image or background image list is carried out
Compare, the difference that selection comparison is obtained from the background image in currently used background image or background image list, which is less than, to be set
The background image of fixed threshold value is as corresponding background image, when comparing obtained difference more than or equal to the threshold value set,
By the background image extracted directly as corresponding background image, and add it in background image list；
The numbering of the foreground image of video monitoring image and corresponding background image in background image list is sent to
Rear end equipment.
Further, it is described by the background image extracted and currently used background image or background image list
Background image is compared, and selects comparison to obtain from the background image in currently used background image or background image list
Difference be less than setting threshold value background image as corresponding background image, is set comparing obtained difference and being more than or equal to
During fixed threshold value, by the background image extracted directly as corresponding background image, and background image list is added it to
In, including：
The background image extracted is compared with currently used background image；
If the difference of the background image extracted and currently used background image is less than the threshold value of setting, will be current
The background image used is used as corresponding background image；
If the difference of the background image extracted and currently used background image is more than or equal to the threshold value of setting,
Further it is compared respectively with the background image in background image list with the background image extracted, when the background extracted
When the difference of some background image in image and background image list is less than the threshold value of setting, then using the background image as right
The background image answered；
If the difference of the background image extracted and all background images in background image list is both greater than or is equal to
During the threshold value of setting, then the background image extracted, directly as corresponding background image, and will be added it to Background
As in list.
Further, the transmission method of the video monitoring image, in addition to：
First background image will be extracted as currently used background image from the first width video monitoring image；
It is less than the threshold value of setting in the difference of the background image extracted and some background image in background image list
When, the background image for the threshold value that the difference of the background image with extracting is less than into setting is used as currently used background image；
It is both greater than in the difference of the background image extracted and all background images in background image list or equal to setting
During fixed threshold value, then the background image extracted is regard as currently used background image.
Further, the transmission method of the video monitoring image, in addition to：
New background image is generated in background image list and corresponding to the numbering of the background image after, will be newly-generated
Background image and be sent to rear end equipment corresponding to the numbering of the background image.
Further, the transmission method of the video monitoring image, in addition to：
Record sends the number of times of the corresponding numbering of background image, when carrying out burin-in process to background image list, preferentially
Delete the minimum background image of transmission times.
The invention also discloses a kind of transmitting device of video monitoring image, set applied to the front end in video monitoring system
It is standby, the transmitting device of the video monitoring image, including：
Image zooming-out module, for extracting foreground image and background image in video monitoring image；
Comparing module, for by the background image extracted and currently used background image or background image list
Background image is compared, and selects comparison to obtain from the background image in currently used background image or background image list
Difference be less than setting threshold value background image as corresponding background image, is set comparing obtained difference and being more than or equal to
During fixed threshold value, by the background image extracted directly as corresponding background image, and background image list is added it to
In；
Sending module, for by the foreground image of video monitoring image and corresponding background image in background image list
Numbering be sent to rear end equipment
Further, the comparing module is by the background image extracted and currently used background image or background image
Background image in list is compared, and is selected from the background image in currently used background image or background image list
The background image of obtained threshold value of the difference less than setting is compared as corresponding background image, the difference obtained in comparison is more than
Or equal to setting threshold value when, by the background image extracted directly as corresponding background image, and add it to background
In image list, following operation is performed：
The background image extracted is compared with currently used background image；
If the difference of the background image extracted and currently used background image is less than the threshold value of setting, will be current
The background image used is used as corresponding background image；
If the difference of the background image extracted and currently used background image is more than or equal to the threshold value of setting,
Further it is compared respectively with the background image in background image list with the background image extracted, when the background extracted
When the difference of some background image in image and background image list is less than the threshold value of setting, then using the background image as right
The background image answered；
If the difference of the background image extracted and all background images in background image list is both greater than or is equal to
During the threshold value of setting, then the background image extracted, directly as corresponding background image, and will be added it to Background
As in list.
Further, the comparing module, is additionally operable to perform following operation：
First background image will be extracted as currently used background image from the first width video monitoring image；
It is less than the threshold value of setting in the difference of the background image extracted and some background image in background image list
When, the background image for the threshold value that the difference of the background image with extracting is less than into setting is used as currently used background image；
It is both greater than in the difference of the background image extracted and all background images in background image list or equal to setting
During fixed threshold value, then the background image extracted is regard as currently used background image.
Further, the transmitting device of the video monitoring image, in addition to synchronization module, in background image list
The new background image of middle generation and corresponding to the numbering of the background image after, by newly-generated background image and corresponding to this
The numbering of background image is sent to rear end equipment.
Further, the transmitting device of the video monitoring image, in addition to ageing module, Background is sent for recording
It is preferential to delete the minimum background of transmission times when carrying out burin-in process to background image list as the number of times of corresponding numbering
Image.
The present invention proposes the transmission method and device of a kind of video monitoring image, passes through the image captured from headend equipment
In extract foreground image and background image, and generate and safeguard a background image list, headend equipment is according to from captured
The background image that extracts of video monitoring image and the currently used background image of headend equipment comparison result, in major part
In the case of only send the numbering of foreground image and background image to rear end equipment, only from the video prison captured by headend equipment
In background image and the currently used background image of headend equipment and headend equipment background image list that control image zooming-out goes out
All background images it is all different when, foreground image and background image are all just sent to back-end server, so that before reducing
The flow bandwidth that video monitoring image captured by end equipment takes when transmitting in an ip network, and reduce headend equipment and clapped
Memory space of the video monitoring image taken the photograph on back-end server.
Brief description of the drawings
Fig. 1 is the flow chart of the transmission method of video monitoring image of the present invention；
Fig. 2 is the schematic network structure of the present embodiment video monitoring system；
Fig. 3 is the transmitting device structural representation of video monitoring image of the present invention.
Embodiment
Technical solution of the present invention is described in further details with reference to the accompanying drawings and examples, following examples are not constituted
Limitation of the invention.
A kind of transmission method of video monitoring image of the present embodiment, applied to the headend equipment in video monitoring system, such as
Shown in Fig. 1, including：
Step S1, the foreground image and background image extracted in video monitoring image.
The network structure of the present embodiment video monitoring system, as shown in Fig. 2 headend equipment and rear end equipment pass through IP network
Network is attached, and captured video monitoring image is sent to rear end equipment by IP network and is analyzed and located by headend equipment
Reason.IP network therein can be LAN or wide area network.Wherein headend equipment be web camera, or simulation take the photograph
Camera and encoder；Rear end equipment is the equipment of store video images, or video image receiving device.
Moving object (such as vehicle) of the present embodiment headend equipment to monitor area internal trigger intelligent rules is captured,
Then the image of candid photograph is handled, the image zooming-out by moving object (such as the vehicle of traveling) from the image of candid photograph goes out
Come, as the foreground image of the candid photograph image, by stationary object (such as building, road, trees) from the image of candid photograph
Image zooming-out comes out, and is used as the background image of the candid photograph image.The present embodiment is illustrated exemplified by capturing image, for real-time
Each frame video monitoring image in monitoring video flow is equally applicable.
Intelligent rules in the present embodiment headend equipment are set according to the different monitoring scene of headend equipment, for example,
The intelligent rules of running red light for vehicle are set as in headend equipment：When stop-light is red light, if vehicle is set by front end
Standby candid photograph trigger winding, then capture to vehicle；In another example, the intelligent rules that driver does not fasten the safety belt in headend equipment
It is set as：Whether there is safety belt in driver's image that detection passes through vehicle, if detecting driver's image by vehicle
In there is no safety belt, then the vehicle is captured.
Headend equipment extracts foreground image and background after video monitoring image is photographed first from video monitoring image
Image.
Step S2, by the Background in the background image extracted and currently used background image or background image list
As being compared, selection compares obtained difference from the background image in currently used background image or background image list
Less than setting threshold value background image as corresponding background image, comparing obtained difference and be more than or equal to the threshold of setting
During value, by the background image extracted directly as corresponding background image, and add it in background image list.
It is current as headend equipment that the present embodiment headend equipment will extract background image from the piece image of candid photograph
The background image used, and the background image is stored in background image list, generate and correspond in background image list
The numbering of the background image.It is easily understood that currently used background image is updated in rear extended meeting, therefore for first
Currently used background image, can also be manually configured using preceding, and the video image shot during using debugging is as head
Individual currently used background image.
Headend equipment is extracted after background image from the image subsequently captured, first the back of the body currently used with headend equipment
Scape image is compared, if the difference of the two is less than the threshold value of setting, then it is assumed that background image does not change, keeps front end to set
Standby currently used background image is constant；If the difference of the two is more than or equal to the threshold value of setting, further with from follow-up
The background image extracted in the image of candid photograph is compared with the background image in background image list, when from the figure subsequently captured
When the difference that background image and some background image in background image list are extracted as in is less than the threshold value of setting, by background
The background image in image list is used as the currently used background image of headend equipment；When the extraction from the image subsequently captured
The difference of each background image gone out in background image and background image list be both greater than or equal to setting threshold value when, then will be from
The background image extracted in the image subsequently captured is as the currently used background image of headend equipment, then by the background
Image is stored in background image list, and generates the new unique number corresponding to the background image.
The particular content of background image list is as shown in the table：
| Numbering | Background image |
| BGNo1 | BackgroundURL1 |
| BGNo2 | BackgroundURL2 |
| BGNo3 | BackgroundURL3 |
| …… | …… |
Table 1
It should be noted that headend equipment generation one new background image and correspondingly every time in background image list
When the numbering of the background image, after being all sent to by newly-generated background image and corresponding to the numbering of the background image
End equipment, the background image list that the background image list for making headend equipment local is recorded with back-end server is consistent.When
Increase in background image list after new a background image and its numbering, directly can then send the prospect of video image
During the numbering of image and corresponding background image, corresponding background image is sent together.Can also after newly-increased background image,
Newly-increased background image and its numbering are individually synchronized to rear end equipment, synchronized.
Pass through the above method, the currently used background image of the present embodiment headend equipment continuous updating headend equipment, generation
And safeguard local background image list.
Step S3, the numbering by the foreground image of video monitoring image and corresponding background image in background image list
It is sent to rear end equipment.
Headend equipment obtains the corresponding background image of current video monitoring image after comparison, so as to send video figure
During picture, it is only necessary to send the numbering by the foreground image of video monitoring image and corresponding background image in background image list
It is sent to rear end equipment.Rear end equipment is according to synchronous obtained background image list, it is possible to obtain corresponding background image, and
Synthesized with foreground image, obtain video monitoring image.
Specifically, the present embodiment headend equipment is extracted from the image of candid photograph after foreground image and background image, with carrying
The background image of the taking-up background image currently used with headend equipment is compared, if the background image extracted and front end
The difference of the currently used background image of equipment is less than the threshold value (such as 10%) of setting, then by the foreground image information extracted
(what is for example analyzed disobeys for (including foreground image and foreground image the positional information in background image), intellectual analysis result
The license plate number of chapter vehicle) and the corresponding numbering transmission in background image list of the currently used background image of headend equipment
To rear end equipment.
The present embodiment headend equipment carry out intellectual analysis process be：Triggering intelligent rules are extracted from the image of candid photograph
Moving object image, then the image of moving object for triggering intelligent rules is analyzed according to intelligent rules, obtained
Analysis result, for example, headend equipment is captured to after the image of running red light for vehicle, according to the position of trigger winding, from the figure of candid photograph
The image of the vehicle made a dash across the red light is extracted as in, then goes out the car of the vehicle from the image zooming-out of the vehicle made a dash across the red light extracted
The trade mark, is used as intellectual analysis result.
If the difference of the background image extracted and the currently used background image of headend equipment is more than or equal to setting
Threshold value, then be further compared respectively with the background image in background image list with the background image extracted, when carrying
When the difference of the background image of taking-up and some background image in background image list is less than the threshold value of setting, then it will extract
Foreground image information, intellectual analysis result and background image list in be less than with the difference of background image that extracts and set
The corresponding numbering of background image of fixed threshold value is sent to rear end equipment.
If the difference of the background image extracted and the currently used background image of headend equipment is more than or equal to setting
Threshold value, and when being compared respectively with the background image in background image list with the background image that extracts, extract
Background image and background image list in the difference of all background images be both greater than or equal to the threshold value of setting, then will extract
The background image gone out is added to background image list, and generates the corresponding numbering of the background image, then by the prospect extracted
Image information, intellectual analysis result, the background image extracted and the corresponding numbering of the background image are sent to rear end equipment.
Above-described embodiment is extracted after background image, is first compared with currently used background image, due to consecutive hours
The background image difference of the interior video image shot less, can so save the time compared.The another implementation of the present invention
Example, can also directly be compared, it is not necessary to set after background image is extracted with the background image in background image list
Currently used background image, after comparison, if difference is less than the threshold value of setting, sends the numbering of the background image, no
The technique effect of the present invention can also be reached into background image list, so by then adding the background image extracted.
It should be noted that the corresponding numbering of background image in background image list is sent to by the present embodiment headend equipment
The transmission times of the background image once, is then added 1 by rear end equipment in background image list, i.e., record sends background image pair
The number of times for the numbering answered.The present embodiment also records the period of background image transmission in background image list.Work as front end
The insufficient memory of equipment, it is necessary to when deleting the background image of part aging, delete the minimum Background of transmission times first
Picture, it is preferential to delete the period sent minimum background image when transmission times is identical.When the memory space foot of headend equipment
When enough, it is not necessary to carry out burin-in process, then the number of times of the corresponding numbering of background image is sent also without record.
The particular content for recording the background image list of the period of transmission times and transmission is as follows：
| Numbering | Background path | Access times | Use time |
| BGNo1 | BackgroundURL1 | Freq1 | Duration1 |
| BGNo2 | BackgroundURL2 | Freq2 | Duration2 |
| BGNo3 | BackgroundURL3 | Freq3 | Duration3 |
| …… | …… | …… | …… |
Table 2
It is easily understood that because the background image that is extracted from the image that headend equipment is captured is lasting at one section
Be held essentially constant in time, i.e., in the image captured from headend equipment the background image that extracts the most of the time all with
The currently used background image of headend equipment is identical, only by excessive daytime to night, by night excessively to daytime, with
And weather when changing suddenly, the background image extracted in the image captured from headend equipment can just work as with headend equipment
The preceding background image used is different, therefore by the above method, the present embodiment is in most cases, it is only necessary to send from candid photograph
The corresponding numbering of foreground image, intellectual analysis result and background image extracted in image, greatly reduces Background
The transmission quantity of picture, so that the flow bandwidth that the image for substantially reducing headend equipment candid photograph takes when transmitting in an ip network.
Preferably, the present embodiment rear end equipment receives the foreground image information of headend equipment transmission, intellectual analysis result
After background image information, the corresponding numbering of the background image received and background image is stored in local background image and arranged
In table, background image list of the background image list preserved in server with being preserved in headend equipment is preserved consistent, will connect
The foreground image information received is separately preserved, and generates intellectual analysis result, foreground image information and foreground image pair
The relation table for the background image numbering answered.When user's Query Information, server is compiled according to the corresponding background image of foreground image
Number corresponding background image is taken out from background image list, according to positional information of the foreground image in background image, by prospect
Image and background image are synthesized, and the image of intellectual analysis result and synthesis then is presented into user.
By the above method, the present embodiment rear end equipment is separately preserved foreground image and background image, is subtracted significantly
The memory space that server preserves image is lacked.
It should be noted that the present embodiment rear end equipment is receiving foreground image information, the intelligence of headend equipment transmission
After analysis result and background image information, preserved after can also foreground image be synthesized with background image.Specifically, inquire about
Whether background image is included in the background image information received, if including Background in the background image information received
The corresponding numbering of background image and background image, then be saved in the background image list of server, then according to prospect by picture
Positional information of the image in background image, is preserved after foreground image and background image are synthesized；If the back of the body received
Background image is not included in scape image information, then according to the corresponding back of the body numbered from server of background image in background image information
Background image is taken out in scape image list, according to positional information of the foreground image in background image, by foreground image and background
Image is preserved after being synthesized.Then the mapping table of intellectual analysis result and composograph is generated, when user's Query Information
When, intellectual analysis result and the image of synthesis are directly presented to user.The image of synthesis is being in by this image storage method
It is more quick when now to user, but be unfavorable for saving the memory space that server preserves image, therefore the present embodiment is preferably by before
Scape image and background image are separately preserved.
As shown in figure 3, a kind of transmitting device of video monitoring image of the present embodiment is applied to the above method accordingly
Headend equipment in video monitoring system, the transmitting device of the video monitoring image, including：
Image zooming-out module, for extracting foreground image and background image in video monitoring image；
Comparing module, for by the background image extracted and currently used background image or background image list
Background image is compared, and selects comparison to obtain from the background image in currently used background image or background image list
Difference be less than setting threshold value background image as corresponding background image, is set comparing obtained difference and being more than or equal to
During fixed threshold value, by the background image extracted directly as corresponding background image, and background image list is added it to
In；
Sending module, for by the foreground image of video monitoring image and corresponding background image in background image list
Numbering be sent to rear end equipment
It is easily understood that comparing module is when being compared, can be by the background image of extraction and background image list
In background image compared one by one, after first can also being compared with currently used background image again with background image arrange
Background image in table is compared one by one.
The present embodiment uses latter processing method, and comparing module is by the background image extracted and the currently used back of the body
Background image in scape image or background image list is compared, from currently used background image or background image list
Background image in selection compare obtained difference be less than setting threshold value background image as corresponding background image, than
When being more than or equal to the threshold value of setting to obtained difference, by the background image extracted directly as corresponding background image,
And add it in background image list, perform following operation：
The background image extracted is compared with currently used background image；
If the difference of the background image extracted and currently used background image is less than the threshold value of setting, will be current
The background image used is used as corresponding background image；
If the difference of the background image extracted and currently used background image is more than or equal to the threshold value of setting,
Further it is compared respectively with the background image in background image list with the background image extracted, when the background extracted
When the difference of some background image in image and background image list is less than the threshold value of setting, then using the background image as right
The background image answered；
If the difference of the background image extracted and all background images in background image list is both greater than or is equal to
During the threshold value of setting, then the background image extracted, directly as corresponding background image, and will be added it to Background
As in list.
In the above-described embodiments, for the renewal of currently used background image, following operation is performed：
First background image will be extracted as currently used background image from the first width video monitoring image；
It is less than the threshold value of setting in the difference of the background image extracted and some background image in background image list
When, the background image for the threshold value that the difference of the background image with extracting is less than into setting is used as currently used background image；
It is both greater than in the difference of the background image extracted and all background images in background image list or equal to setting
During fixed threshold value, then the background image extracted is regard as currently used background image.
The transmitting device of the present embodiment video monitoring image, in addition to synchronization module, for raw in background image list
Cheng Xin background image and corresponding to the numbering of the background image after, by newly-generated background image and corresponding to the background
The numbering of image is sent to rear end equipment.The sychronisation can not change the information format of sending module transmission, individually carry out
The renewal of background image list, implements and more facilitates.
The transmitting device of the present embodiment video monitoring image, in addition to ageing module, background image pair is sent for recording
The number of times for the numbering answered, it is preferential to delete the minimum background image of transmission times when carrying out burin-in process to background image list.
When the space for storing background image list is sufficiently large, it is not necessary to which ageing module carries out burin-in process.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, without departing substantially from essence of the invention
In the case of refreshing and its essence, those skilled in the art work as can make various corresponding changes and change according to the present invention
Shape, but these corresponding changes and deformation should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. a kind of transmission method of video monitoring image, applied to the headend equipment in video monitoring system, it is characterised in that institute
The transmission method of video monitoring image is stated, including：
Extract the foreground image and background image in video monitoring image；
The background image extracted is compared with the background image in currently used background image or background image list,
Selection compares obtained difference less than setting from the background image in currently used background image or background image list
The background image of threshold value, when comparing obtained difference more than or equal to the threshold value set, will be carried as corresponding background image
The background image of taking-up is added it in background image list directly as corresponding background image；
The numbering of the foreground image of video monitoring image and corresponding background image in background image list is sent to rear end
Equipment.
2. the transmission method of video monitoring image according to claim 1, it is characterised in that described by the background extracted
Image is compared with the background image in currently used background image or background image list, from currently used Background
Selection compares the background image conduct that obtained difference is less than the threshold value of setting in background image in picture or background image list
Corresponding background image, it is when comparing obtained difference more than or equal to the threshold value set, the background image extracted is direct
As corresponding background image, and add it in background image list, including：
The background image extracted is compared with currently used background image；
If the difference of the background image extracted and currently used background image is less than the threshold value of setting, will be currently used
Background image be used as corresponding background image；
If the difference of the background image extracted and currently used background image is more than or equal to the threshold value of setting, enter one
Step is compared respectively with the background image extracted with the background image in background image list, when the background image extracted
When being less than the threshold value of setting with the difference of some background image in background image list, then using the background image as corresponding
Background image；
If the difference of the background image extracted and all background images in background image list is both greater than or equal to setting
Threshold value when, then by by the background image extracted directly as corresponding background image, and add it to background image row
In table.
3. the transmission method of video monitoring image according to claim 2, it is characterised in that the video monitoring image
Transmission method, in addition to：
First background image will be extracted as currently used background image from the first width video monitoring image；
, will when the difference of the background image extracted and some background image in background image list is less than the threshold value of setting
The difference of background image with extracting is less than the background image of the threshold value of setting as currently used background image；
It is both greater than or equal to setting in the difference of the background image extracted and all background images in background image list
During threshold value, then the background image extracted is regard as currently used background image.
4. the transmission method of video monitoring image according to claim 1, it is characterised in that the video monitoring image
Transmission method, in addition to：
New background image is generated in background image list and corresponding to the numbering of the background image after, by the newly-generated back of the body
Scape image and numbering corresponding to the background image are sent to rear end equipment.
5. the transmission method of video monitoring image according to claim 1, it is characterised in that the video monitoring image
Transmission method, in addition to：
Record sends the number of times of the corresponding numbering of background image, preferential to delete when carrying out burin-in process to background image list
The minimum background image of transmission times.
6. a kind of transmitting device of video monitoring image, applied to the headend equipment in video monitoring system, it is characterised in that institute
The transmitting device of video monitoring image is stated, including：
Image zooming-out module, for extracting foreground image and background image in video monitoring image；
Comparing module, for by the background in the background image extracted and currently used background image or background image list
Image is compared, and selection compares obtained difference from the background image in currently used background image or background image list
The background image of the different threshold value for being less than setting is comparing obtained difference more than or equal to setting as corresponding background image
During threshold value, by the background image extracted directly as corresponding background image, and add it in background image list；
Sending module, for the volume by the foreground image of video monitoring image and corresponding background image in background image list
Number it is sent to rear end equipment.
7. the transmitting device of video monitoring image according to claim 6, it is characterised in that the comparing module will be extracted
The background image gone out is compared with the background image in currently used background image or background image list, from currently used
Background image or background image list in background image in selection compare the background that obtained difference is less than the threshold value of setting
Image is as corresponding background image, when comparing obtained difference more than or equal to the threshold value set, by the background extracted
Image is added it in background image list directly as corresponding background image, performs following operation：
The background image extracted is compared with currently used background image；
If the difference of the background image extracted and currently used background image is less than the threshold value of setting, will be currently used
Background image be used as corresponding background image；
If the difference of the background image extracted and currently used background image is more than or equal to the threshold value of setting, enter one
Step is compared respectively with the background image extracted with the background image in background image list, when the background image extracted
When being less than the threshold value of setting with the difference of some background image in background image list, then using the background image as corresponding
Background image；
If the difference of the background image extracted and all background images in background image list is both greater than or equal to setting
Threshold value when, then by by the background image extracted directly as corresponding background image, and add it to background image row
In table.
8. the transmitting device of video monitoring image according to claim 7, it is characterised in that the comparing module, is also used
Operated as follows in performing：
First background image will be extracted as currently used background image from the first width video monitoring image；
, will when the difference of the background image extracted and some background image in background image list is less than the threshold value of setting
The difference of background image with extracting is less than the background image of the threshold value of setting as currently used background image；
It is both greater than or equal to setting in the difference of the background image extracted and all background images in background image list
During threshold value, then the background image extracted is regard as currently used background image.
9. the transmitting device of video monitoring image according to claim 6, it is characterised in that the video monitoring image
Transmitting device, in addition to synchronization module, the new background image and corresponding to the background for being generated in background image list
After the numbering of image, rear end equipment is sent to by newly-generated background image and corresponding to the numbering of the background image.
10. the transmitting device of video monitoring image according to claim 6, it is characterised in that the video monitoring image
Transmitting device, in addition to ageing module sends the number of times of the corresponding numbering of background image for recording, arranged to background image
It is preferential to delete the minimum background image of transmission times when table carries out burin-in process.
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