CN107690052A - A kind of method and device of video monitoring image superposition watermark - Google Patents
A kind of method and device of video monitoring image superposition watermark Download PDFInfo
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- CN107690052A CN107690052A CN201710690528.XA CN201710690528A CN107690052A CN 107690052 A CN107690052 A CN 107690052A CN 201710690528 A CN201710690528 A CN 201710690528A CN 107690052 A CN107690052 A CN 107690052A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/762—Media network packet handling at the source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark
Abstract
The invention discloses a kind of method and device of video monitoring image superposition watermark, this method is sent to the logon message of system server-side by intercepting client, parses logon message, IP address and port numbers outside client NAT are recorded in watermark mapping table；And the negotiation packet that client is sent to system server-side is intercepted, negotiation packet is parsed, IP address in client NAT is recorded in watermark mapping table；Then the Media Stream that interception system server side is sent, according to the purpose IP address and port numbers in media stream message head, watermark mapping table is inquired about, finds IP address in corresponding client NAT and, as watermark information, be added in video image.The superposition watermarking device of the present invention intercepts module including logon message, negotiation packet intercepts module and watermark superposition module.The present invention will play the IP address of the program request person of video as watermark information, and leakage source can be traced according to monitoring image, prevents the leakage of monitoring image.
Description
Technical field
The invention belongs to technical field of video monitoring, more particularly to the method and dress of a kind of superposition watermark of video monitoring image
Put.
Background technology
Video monitoring is the important component of safety and protection system, and video monitoring is with its directly perceived, accurate, timely and information
It is abundant in content and be widely used in many occasions.In recent years, with computer, network and image procossing, transmission technology fly
Speed development, the universalness trend of video monitoring are more and more obvious.Video monitoring play a part of in the security protection of city it is increasing,
Public security, break in traffic rules and regulations and the criminal case of generation, much depend on the video shadow for the CCTV camera record being distributed in city
As having obtained final detection.
Simultaneously with the rapid development of mobile Internet, the Video security in video monitoring system becomes to become more and more important, its
In an important security threat be when monitoring image is being shown on screen, it is easy to mobile phone photograph or record are used by people
Picture, monitoring image data is caused to be compromised away.Once by the illegal means monitoring image by taking pictures or recording a video
Form is leaked on internet, and the influence that can not be retrieved easily is caused to party, and is difficult retrospect leakage source, so that can not
The responsibility of lawbreaker is investigated, very big hidden danger is left for social stability.
Although there is technical scheme to be superimposed OSD watermarks in the ad-hoc location of image at present, because OSD positions are fixed, hold
Easily it is photographed and avoids.Its own system is relied on simultaneously carries out watermark superposition, disposition flexibility deficiency.
The content of the invention
It is an object of the invention to provide a kind of method and device of video monitoring image superposition watermark, by setting specially
The device of watermark is superimposed, watermark is superimposed in video monitoring image, so as to solve not tracing video image leakage source at present
The problem of.
To achieve these goals, technical solution of the present invention is as follows：
A kind of method of video monitoring image superposition watermark, for being that video monitoring image is superimposed in video monitoring system
Watermark, the video monitoring system include system server and client, the method for the video monitoring image superposition watermark, bag
Include：
The logon message that client is sent to system server-side is intercepted, logon message is parsed, by IP address outside client NAT
It is recorded in port numbers in watermark mapping table；
The negotiation packet that client is sent to system server-side is intercepted, negotiation packet is parsed, by IP address in client NAT
It is recorded in watermark mapping table；
The Media Stream that interception system server side is sent, according to the purpose IP address in media stream message head and port
Number, watermark mapping table is inquired about, IP address in corresponding client NAT is found and, as watermark information, is added in video image.
Further, it is described find corresponding to IP address is as watermark information in client NAT, be added to video image
In, in addition to：
With the densely covered principle of setting, watermark information is equably added in video image.
Further, it is described find corresponding to IP address is as watermark information in client NAT, be added to video image
In, in addition to：
Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally be perceived and regarded
The watermark information being superimposed in frequency image.
Further, it is described find corresponding to IP address is as watermark information in client NAT, be added to video image
In, in addition to：
In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
Further, the method for the video monitoring image superposition watermark, in addition to：
When purpose IP address and port numbers in the media stream message head being not present in the watermark mapping table, do not enter
Row watermark superposition.
The invention also provides a kind of video monitoring image superposition watermarking device, for being video in video monitoring system
Monitoring image is superimposed watermark, and the video monitoring system includes system server and client, the video monitoring image superposition
Watermarking device, including：
Logon message intercepts module, and the logon message of system server-side, parsing registration report are sent to for intercepting client
Text, IP address and port numbers outside client NAT are recorded in watermark mapping table；
Negotiation packet intercepts module, and the negotiation packet of system server-side is sent to for intercepting client, and report is consulted in parsing
Text, IP address in client NAT is recorded in watermark mapping table；
Watermark superposition module, the Media Stream sent for interception system server side, according in media stream message head
Purpose IP address and port numbers, watermark mapping table is inquired about, find IP address in corresponding client NAT and, as watermark information, fold
It is added in video image.
Further, IP address is used as watermark information to the watermark superposition module in client NAT corresponding to find, folded
When being added in video image, following operation is also performed：
With the densely covered principle of setting, watermark information is equably added in video image.
Further, IP address is used as watermark information to the watermark superposition module in client NAT corresponding to find, folded
When being added in video image, following operation is also performed：
Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally be perceived and regarded
The watermark information being superimposed in frequency image.
Further, IP address is used as watermark information to the watermark superposition module in client NAT corresponding to find, folded
When being added in video image, following operation is also performed：
In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
Further, the watermark superposition module, the media stream message head is not present in the watermark mapping table
In purpose IP address and port numbers when, without watermark superposition.
The method and device of a kind of video monitoring image superposition watermark proposed by the present invention, by system server and visitor
Deployment superposition watermarking device between the end of family, the IP address for the program request person that will play video are added to video figure as watermark information
As in.Anti-leak information can be included in monitoring image, so as to trace leakage source according to monitoring image, prevents to monitor
The leakage of image.
Brief description of the drawings
Fig. 1 is video monitoring system network structure of the embodiment of the present invention；
Fig. 2 is the method flow diagram that video monitoring image of the present invention is superimposed watermark；
Fig. 3 is that video monitoring image of the present invention is superimposed watermarking device structural representation.
Embodiment
Technical solution of the present invention is described in further details with reference to the accompanying drawings and examples, following examples are not formed
Limitation of the invention.
As shown in figure 1, video monitoring system generally includes headend equipment (such as web camera IPC), videoconference client
(or referred to as client), and the system server such as media server, registrar, system server generally all concentrate on
Together, also referred to as back-stage management server, network is accessed by switch device.Technical scheme is outside system server
The outlet for connecing router sets superposition watermarking device, or the outlet of the egress router of private network where client to set superposition water
Printing equipment is put, and superposition watermarking device can be a server or other Special Equipments so that all registrations to system server
Message, can all pass through the device, and the negotiation packet between same client and system server will also pass through the device, and from being
The Media Stream that system server side is sent will also pass through the device.
As shown in Fig. 2 a kind of method of video monitoring image superposition watermark, including：
The logon message that client is sent to system server-side is intercepted, logon message is parsed, by IP address outside client NAT
It is recorded in port numbers in watermark mapping table；
The negotiation packet that client is sent to system server-side is intercepted, negotiation packet is parsed, by IP address in client NAT
It is recorded in watermark mapping table；
The Media Stream that interception system server side is sent, according to the purpose IP address in media stream message head and port
Number, watermark mapping table is inquired about, IP address in corresponding client NAT is found and, as watermark information, is added in video image.
For the application by taking Fig. 1 as an example, superposition watermarking device is provided with network interface 1 and network interface 2, and network interface 2 connects system server-side
Interchanger or router, network interface 1 connects outer net, and the message of IPC, client from outer net is needed by superposition watermarking device
Network interface 1, then be dealt into system server.And when Media Stream is sent in system server, it is also desirable to can just be sent by network interface 2.
Therefore start on network interface 1 and network interface 2 and intercept, it is possible to obtain message or Media Stream.
The present embodiment is sent to the logon message of system server-side by intercepting client, logon message is parsed, by client
The outer IP address of end NAT and port numbers are recorded in watermark mapping table.
Specifically, all logon messages into network interface 1 are intercepted on network interface 1, such as in national standard 28181, Izvestia
Method is that Register is logon message in text.By logon message, the source address carried in logon message can be obtained
And port numbers.Therefore when receiving the logon message that client is sent, the logon message can be parsed and obtain the outer IP of client NAT
Address and port numbers.
It should be noted that if client IP address and port numbers outside public network, client NAT are exactly that it is actual
IP address and port numbers；If client IP address and port numbers outside private network, client NAT are exactly that it is reflected by nat port
Obtained outer net IP address and port numbers is penetrated, now client private network IP address and port numbers in NAT are unknown.Client exists
Private network IP address in NAT, IP address also referred to as in client NAT.
Therefore, it is necessary to further intercept the negotiation packet that client is sent to system server-side, negotiation packet is parsed, by visitor
IP address is recorded in watermark mapping table in the NAT of family end.
Specifically, all negotiation packets into network interface 1 are intercepted on network interface 1, client establishes matchmaker with system server
When body stream connects, connection is established in the interaction that to be held consultation according to national standard 28181, no longer superfluous here for the flow of negotiation interaction
State.Such as INVITE the or 200OK messages that client is sent, receipts flow device (i.e. client) can be obtained from above-mentioned message and is existed
Private network IP address and port numbers in NAT, so as to which IP address in client NAT is recorded in watermark mapping table.
If the it should be noted that client that client obtains in public network, the negotiation packet that parsing client is sent
IP address and port numbers are still the actual IP address and port numbers of client in NAT, the registration report with parsing client transmission
The outer IP address of NAT that text obtains is consistent with port numbers.
One embodiment of the application, the watermark mapping table of record are as follows：
Table 1
It is the example of an INVITE message below by taking INVITE messages as an example：
INVITE sip:The domain name or IP address port SIP/2.0 of media stream person's device coding mesh
To:sip:The domain name of media stream person's device coding mesh
Content-Length:The byte length of message entity
Contact:<sip:Media stream receiver person's device coding@source IP address port>
CSeq:1INVITE
Call-ID:wlss-f7c53b46-eea27828118c3b50449185980f4bfdf0@192.168.1.2
Via:SIP/2.0/UDP source domain name or IP address
From:<sip:Media stream receiver person's device coding@source domain names>；Tag=e3719a0b
Subject:Media stream person's device coding:Transmitting terminal Media Stream sequence number, media stream receiver person's device coding:
Receiving terminal Media Stream sequence number
Content-Type:APPLICATION/SDP
Max-Forwards:70
V=0
The 0IN IP4 192.168.1.10 of o=64010600002020000001 0
S=Play
C=IN IP4 192.168.1.10
T=0 0
M=video 6000RTP/AVP 96 98 97
A=recvonly
A=rtpmap:96H264/90000
A=rtpmap:98H264/90000
A=rtpmap:97MPEG4/90000
In another example 200OK message is as follows：
SIP/2.0 200OK
Via:SIP/2.0/UDP source domain name or IP address
From:<sip:The domain name of media stream person's device coding mesh>；Tag=1ad9931d
To:<sip:Sip server encodes@source domain names>；Tag=3094947605
Call-ID:wlss-11df50d7-730beb6350a5506aa8316d9dc100cf6b@192.168.1.2
CSeq:1INVITE
Contact:<sip:Media stream receiver person's device coding@source IP address port>
Content-Type:APPLICATION/SDP
Content-Length:The byte length of message entity
V=0
The 0IN IP4 192.168.1.10 of o=64010600002020000001 0
S=##dc20091214
C=IN IP4 192.168.1.10
T=0 0
M=video 6000RTP/AVP 96 98 97
A=recvonly
A=rtpmap:96H264/90000
A=rtpmap:98H264/90000
A=rtpmap:97MPEG4/90000
Comprising client (receipts flow device) private network IP address and port numbers in NAT in obvious above-mentioned message.
After watermark mapping table is established, superposition watermarking device will also intercept Media Stream on network interface 2, according to media stream message
Purpose IP address and port numbers inquiry watermark mapping table in head, find and receive client NAT corresponding to flow device (client)
Interior IP address, as watermark information, it is added in video image.
It is easily understood that superposition watermark information is to Media Stream, it is necessary to first decoded to obtain video image, then regarding
Watermark is superimposed in frequency image, finally the video image for being superimposed watermark is recompiled again and is transmitted for Media Stream, on water
The superposition of print repeats no more here.Be superimposed watermarking device it is folded it is watermarked after, by forwarding media stream to network interface 1, re-send to
In network, received by client.
One embodiment of the application, a kind of method of video monitoring image superposition watermark, in addition to：
When purpose IP address and port numbers in the media stream message head being not present in the watermark mapping table, do not enter
Row watermark superposition.
In fact, if the purpose IP address in media stream message head can not be found in watermark mapping table, judge to receive
Flow device is not client, but the media forwarding unit of subordinate domain, then without watermark superposition.Of course for preventing in media
Revealed on forwarding unit, some special information can also be superimposed with for reminding.Such as the title of superposition forwarding unit.
As one preferred embodiment of the application, a kind of method of video monitoring image superposition watermark of the application, wherein
IP address is as watermark information in client NAT corresponding to finding, when being added in video image, in addition to：
With the densely covered principle of setting, watermark information is equably added in video image.
In order to prevent that the person of taking on the sly avoids watermark intentionally, and the present embodiment believes watermark when video record of taking on the sly causes leakage
Breath is gathered in video image, and densely covered principle can be calculated with line space, such as every 100 pixels or 50 pixels, arrangement one
Row；Or calculated with column pitch, such as every 100 pixels or 50 pixels, the row of arrangement one；Or every 100 pixel line spaces and
100 pixel column pitch, gather from the upper left corner to the lower right corner.The application is not limited to densely covered concrete form.
As one preferred embodiment of the application, a kind of method of video monitoring image superposition watermark of the application, wherein
IP address is as watermark information in client NAT corresponding to finding, when being added in video image, in addition to：
Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally be perceived and regarded
The watermark information being superimposed in frequency image.
For example, the scope of transparency is 0~100,0 to be opaque, 100 be all-transparent, and transparency needs in the present embodiment
Adjustment has relatively good effect more than 90.
It can not normally be perceived by adjusting transparency of the watermark information in video image to human eye, user can not be influenceed
Video image is watched, and can is enough by extracting watermark information to video image decoding, reaches the mesh for preventing that video record from revealing
's.
As one preferred embodiment of the application, a kind of method of video monitoring image superposition watermark of the application, wherein
IP address is as watermark information in client NAT corresponding to finding, when being added in video image, in addition to：
In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
In order to play warning function to the person of taking on the sly, be preventive from possible trouble, the present embodiment video image specified location, such as
The upper left corner, it is superimposed obvious OSD watermark informations so that, can be it can be clearly seen that this video image has water when decoding end is shown
Official seal ceases, and has made leakage-preventing processing, plays fright effect.On the size of OSD watermarks, with and not shadow high-visible in the upper left corner
It is standard to ring video pictures, can be adjusted as needed.And its contrast, can clearly be shown as on the video images
Standard, it is adjusted according to video image.
It should be noted that the present embodiment can also be implemented in decoding end, by decoding end after video flowing is received, take former
The I frames of second, find the position where watermark, widen contrast automatically, and discovery has watermark, then watermark extracted, in the video of broadcasting
Specified location is superimposed OSD watermarks on image.
A kind of method of video monitoring image superposition watermark of the application, the IP of program request person's (client) of video will be played
Location is added in video image as watermark information, by adjusting transparency, by watermark in a manner of gathering, is superimposed upon video
OSD area is avoided in image, during preventing mobile phone photograph.The superposition watermarking device of the present embodiment can be deployed to existing system
In, deployment is very easy to, is superimposed watermark information automatically.When program request person is in private network, the address of private network can also be superimposed, when more
Individual program request person, even if sharing same public network address, can also support to be superimposed different private net addresses in private network.It is and automatic
Watermark is extracted, is shown in the form of OSD, to have the function that warning is reminded.When the superior and the subordinate domain be present, the device is known automatically
Whether itself is not the end-equipment for connecting client, and higher level domain equipment does not beat any water to the Media Stream for being sent to subordinate domain equipment
Print, and watermark is only superimposed by end-equipment.
Corresponding to the method for above-mentioned video monitoring image superposition watermark, there is also provided corresponding video monitoring image
The embodiment of watermarking device (being above superimposed watermarking device) is superimposed, as shown in figure 3, the superposition watermarking device includes：
Logon message intercepts module, and the logon message of system server-side, parsing registration report are sent to for intercepting client
Text, IP address and port numbers outside client NAT are recorded in watermark mapping table；
Negotiation packet intercepts module, and the negotiation packet of system server-side is sent to for intercepting client, and report is consulted in parsing
Text, IP address in client NAT is recorded in watermark mapping table；
Watermark superposition module, the Media Stream sent for interception system server side, according in media stream message head
Purpose IP address and port numbers, watermark mapping table is inquired about, find IP address in corresponding client NAT and, as watermark information, fold
It is added in video image.
Similarly, found as one preferred embodiment of the application, watermark superposition module in corresponding client NAT
IP address when being added in video image, also performs following operation as watermark information：
With the densely covered principle of setting, watermark information is equably added in video image.
Similarly, found as one preferred embodiment of the application, watermark superposition module in corresponding client NAT
IP address when being added in video image, also performs following operation as watermark information：
Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally be perceived and regarded
The watermark information being superimposed in frequency image.
Similarly, found as one preferred embodiment of the application, watermark superposition module in corresponding client NAT
IP address when being added in video image, also performs following operation as watermark information：
In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
Similarly, as one preferred embodiment of the application, watermark superposition module, do not deposited in the watermark mapping table
During purpose IP address and port numbers in the media stream message head, without watermark superposition.
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, which work as, can make various corresponding changes and become 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)
- A kind of 1. method of video monitoring image superposition watermark, for being that video monitoring image is superimposed water in video monitoring system Print, the video monitoring system include system server and client, it is characterised in that the video monitoring image is superimposed watermark Method, including：The logon message that client is sent to system server-side is intercepted, logon message is parsed, by IP address and end outside client NAT Slogan is recorded in watermark mapping table；The negotiation packet that client is sent to system server-side is intercepted, negotiation packet is parsed, IP address in client NAT is recorded In watermark mapping table；The Media Stream that interception system server side is sent, according to the purpose IP address and port numbers in media stream message head, look into Watermark mapping table is ask, IP address in corresponding client NAT is found and, as watermark information, is added in video image.
- 2. the method for video monitoring image superposition watermark as claimed in claim 1, it is characterised in that described to find corresponding visitor IP address is added in video image as watermark information in the NAT of family end, in addition to：With the densely covered principle of setting, watermark information is equably added in video image.
- 3. the method for video monitoring image superposition watermark as claimed in claim 1 or 2, it is characterised in that described to find correspondingly Client NAT in IP address as watermark information, be added in video image, in addition to：Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally perceive video figure The watermark information being superimposed as in.
- 4. the method for video monitoring image superposition watermark as claimed in claim 1, it is characterised in that described to find corresponding visitor IP address is added in video image as watermark information in the NAT of family end, in addition to：In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
- 5. the method for video monitoring image superposition watermark as claimed in claim 1, it is characterised in that the video monitoring image The method of watermark is superimposed, in addition to：When purpose IP address and port numbers in the media stream message head being not present in the watermark mapping table, without water Print superposition.
- 6. a kind of video monitoring image is superimposed watermarking device, for being that video monitoring image is superimposed water in video monitoring system Print, the video monitoring system include system server and client, it is characterised in that the video monitoring image is superimposed watermark Device, including：Logon message intercepts module, and the logon message of system server-side is sent to for intercepting client, parses logon message, will The outer IP address of client NAT and port numbers are recorded in watermark mapping table；Negotiation packet intercepts module, and the negotiation packet of system server-side is sent to for intercepting client, parses negotiation packet, will IP address is recorded in watermark mapping table in client NAT；Watermark superposition module, the Media Stream sent for interception system server side, according to the purpose in media stream message head IP address and port numbers, watermark mapping table is inquired about, find IP address in corresponding client NAT and, as watermark information, be added to In video image.
- 7. video monitoring image as claimed in claim 6 is superimposed watermarking device, it is characterised in that the watermark superposition module exists IP address as watermark information, when being added in video image, also performs following operation in client NAT corresponding to finding：With the densely covered principle of setting, watermark information is equably added in video image.
- 8. video monitoring image superposition watermarking device as claimed in claims 6 or 7, it is characterised in that the watermark superposition mould Block is IP address is as watermark information in client NAT corresponding to finding, and when being added in video image, also execution is following grasps Make：Transparency of the watermark information in video image is adjusted to the scope set so that human eye can not normally perceive video figure The watermark information being superimposed as in.
- 9. video monitoring image as claimed in claim 6 is superimposed watermarking device, it is characterised in that the watermark superposition module exists IP address as watermark information, when being added in video image, also performs following operation in client NAT corresponding to finding：In the specified location of video image, superposition is sized setting the OSD watermark informations of contrast.
- 10. video monitoring image as claimed in claim 6 is superimposed watermarking device, it is characterised in that the watermark superposition module, When purpose IP address and port numbers in the media stream message head being not present in the watermark mapping table, without watermark Superposition.
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| CN109348308A (en) * | 2018-11-20 | 2019-02-15 | 福建亿榕信息技术有限公司 | A kind of traceable method of monitor video leakage and storage medium based on random watermark |
| CN109743641A (en) * | 2019-01-23 | 2019-05-10 | 武汉烽火众智智慧之星科技有限公司 | The method and system of monitor video superposition watermark |
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