CN107690052B - Method and device for overlaying watermark on video monitoring image - Google Patents
Method and device for overlaying watermark on video monitoring image Download PDFInfo
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- CN107690052B CN107690052B CN201710690528.XA CN201710690528A CN107690052B CN 107690052 B CN107690052 B CN 107690052B CN 201710690528 A CN201710690528 A CN 201710690528A CN 107690052 B CN107690052 B CN 107690052B
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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
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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
- H04L65/75—Media network packet handling
- H04L65/762—Media network packet handling at the source
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- 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
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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
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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
- 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 method and a device for superposing watermarks on video monitoring images, wherein the method comprises the steps of monitoring a registration message sent by a client to a system server side, analyzing the registration message, and recording an external IP address and a port number of a client NAT in a watermark mapping table; monitoring a negotiation message sent by a client to a system server side, analyzing the negotiation message, and recording an IP address in a client NAT in a watermark mapping table; then, a media stream sent by a system server side is monitored, a watermark mapping table is inquired according to a destination IP address and a port number in a media stream message header, and a corresponding IP address in a client NAT is found out to be used as watermark information and is superposed to a video image. The watermark superposing device comprises a registration message intercepting module, a negotiation message intercepting module and a watermark superposing module. The invention takes the IP address of the video-playing jukebox as the watermark information, can trace the leakage source according to the monitoring image and completely eradicates the leakage of the monitoring image.
Description
Technical Field
The invention belongs to the technical field of video monitoring, and particularly relates to a method and a device for overlaying watermarks on video monitoring images.
Background
Video monitoring is an important component of a safety precaution system, and is widely applied to many occasions due to intuition, accuracy, timeliness and rich information content. In recent years, with the rapid development of computers, networks, image processing and transmission technologies, the popularization trend of video monitoring is more and more obvious. Video monitoring plays an increasingly large role in urban security, and many public security, traffic violation and criminal cases are finally detected by video images recorded by monitoring cameras distributed in cities.
Meanwhile, with the rapid development of the mobile internet, the video security in the video monitoring system becomes increasingly important, and one of the important security threats is that when the monitored image is displayed on a screen, the monitored image is easily photographed or recorded by a person using a mobile phone, so that the monitored image data is leaked out. Once the monitoring image is leaked to the internet in a form of photographing or video recording by the illegal means, irrecoverable influence is easily caused to parties, and the leakage source is difficult to trace, so that the responsibility of an illegal person cannot be traced, and great hidden danger is left for social stability.
Although there is a technical solution to superimpose the OSD watermark at a specific position of an image at present, the OSD position is fixed, and therefore the OSD position is easily avoided by photographing. Meanwhile, the watermark superposition is carried out by depending on the system of the user, and the deployment flexibility is insufficient.
Disclosure of Invention
The invention aims to provide a method and a device for superposing watermarks on video monitoring images.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for overlaying watermarks on video monitoring images is used for overlaying watermarks on the video monitoring images in a video monitoring system, the video monitoring system comprises a system server and a client, and the method for overlaying the watermarks on the video monitoring images comprises the following steps:
monitoring a registration message sent by a client to a system server side, analyzing the registration message, and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
monitoring a negotiation message sent by a client to a system server side, analyzing the negotiation message, and recording an IP address in a client NAT in a watermark mapping table;
and monitoring a media stream sent by a server side of the system, inquiring a watermark mapping table according to a destination IP address and a port number in a header of a media stream message, finding out a corresponding IP address in a client NAT as watermark information, and superposing the watermark information to a video image.
Further, the finding of the corresponding IP address in the client NAT as watermark information to be superimposed on the video image further includes:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
Further, the finding of the corresponding IP address in the client NAT as watermark information to be superimposed on the video image further includes:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
Further, the finding of the corresponding IP address in the client NAT as watermark information to be superimposed on the video image further includes:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
Further, the method for superimposing the watermark on the video surveillance image further includes:
and when the target IP address and the port number in the header of the media stream message do not exist in the watermark mapping table, the watermark is not superposed.
The invention also provides a video monitoring image watermark superimposing apparatus, which is used for superimposing watermarks on video monitoring images in a video monitoring system, wherein the video monitoring system comprises a system server and a client, and the video monitoring image watermark superimposing apparatus comprises:
the registration message interception module is used for intercepting a registration message sent by a client to a system server side, analyzing the registration message and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
a negotiation message interception module for intercepting a negotiation message sent by a client to a system server side, analyzing the negotiation message and recording an IP address in a client NAT in a watermark mapping table;
and the watermark superposition module is used for monitoring a media stream sent by the server side of the system, inquiring the watermark mapping table according to a destination IP address and a port number in the header of the media stream message, finding out a corresponding IP address in the client NAT as watermark information, and superposing the watermark information to a video image.
Further, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information and superimposes the watermark information on the video image, the following operations are also performed:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
Further, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information and superimposes the watermark information on the video image, the following operations are also performed:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
Further, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information and superimposes the watermark information on the video image, the following operations are also performed:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
Further, the watermark superposition module does not perform watermark superposition when the destination IP address and the port number in the header of the media stream packet do not exist in the watermark mapping table.
The invention provides a method and a device for overlaying watermarks on video monitoring images. Can contain in the surveillance image and prevent leaking information to can trace back the leakage source according to the surveillance image, stop surveillance image's leakage.
Drawings
FIG. 1 is a network structure diagram of a video monitoring system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for overlaying watermarks on a video surveillance image according to the present invention;
fig. 3 is a schematic structural diagram of a video surveillance image watermark superimposing apparatus according to the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the drawings and examples, which should not be construed as limiting the present invention.
As shown in fig. 1, a video monitoring system generally includes a front-end device (such as a webcam IPC), a video client (or simply referred to as a client), and a system server such as a media server and a registration server, where the system server is generally centralized together, also referred to as a background management server, and is accessed to a network through a switch device. According to the technical scheme, the superposed watermark device is arranged at an outlet of an external router of the system server, or at an outlet of an outlet router of a private network where the client is located, the superposed watermark device can be a server or other special equipment, so that all registration messages to the system server can pass through the device, negotiation messages between the client and the system server can also pass through the device, and media streams sent from the side of the system server can also pass through the device.
As shown in fig. 2, a method for superimposing a watermark on a video surveillance image includes:
monitoring a registration message sent by a client to a system server side, analyzing the registration message, and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
monitoring a negotiation message sent by a client to a system server side, analyzing the negotiation message, and recording an IP address in a client NAT in a watermark mapping table;
and monitoring a media stream sent by a server side of the system, inquiring a watermark mapping table according to a destination IP address and a port number in a header of a media stream message, finding out a corresponding IP address in a client NAT as watermark information, and superposing the watermark information to a video image.
In the application, taking fig. 1 as an example, the watermarking device is provided with a port 1 and a port 2, the port 2 is connected to a switch or a router on the side of the system server, the port 1 is connected to an external network, and the messages from the IPC and the client of the external network need to pass through the port 1 of the watermarking device and then be sent to the system server. When the media stream in the system server is sent out, the media stream also needs to be sent out through the internet access 2. Therefore, the interception is started on the network port 1 and the network port 2, and the message or the media stream can be obtained.
In the embodiment, the registration message sent by the client to the system server side is intercepted, and the external IP address and the port number of the NAT of the client are recorded in the watermark mapping table.
Specifically, all registration messages entering into portal 1 are intercepted on portal 1, for example, in national standard 28181, a Method in a message is a Register, that is, a registration message. Through the registration message, the source address and the port number carried in the registration message can be obtained. Therefore, when receiving the registration message sent by the client, the registration message can be analyzed to obtain the external IP address and the port number of the NAT of the client.
It should be noted that, if the client is in the public network, the external IP address and port number of the NAT of the client are the actual IP address and port number; if the client is in the private network, the external IP address and the port number of the NAT of the client are the external IP address and the port number obtained by the mapping of the NAT port, and the private IP address and the port number of the client in the NAT are unknown at the moment. The private network IP address of the client in the NAT is also called as the IP address in the client NAT.
Therefore, it is necessary to further monitor the negotiation packet sent from the client to the system server side, analyze the negotiation packet, and record the IP address in the NAT of the client in the watermark mapping table.
Specifically, all negotiation messages entering into the internet access 1 are intercepted on the internet access 1, and when a client establishes a media stream connection with a system server, negotiation interaction is performed according to national standard 28181 to establish a connection, and details of a negotiation interaction flow are not repeated here. For example, an INVITE or 200OK message sent by the client, from which the private network IP address and port number of the streaming receiving device (i.e., the client) in the NAT can be obtained, so that the IP address in the NAT of the client can be recorded in the watermark mapping table.
It should be noted that, if the client is in the public network, the IP address and the port number in the NAT of the client, which are obtained by analyzing the negotiation packet sent by the client, are still the actual IP address and port number of the client, and are consistent with the IP address and port number outside the NAT, which are obtained by analyzing the registration packet sent by the client.
In one embodiment of the present application, the recorded watermark mapping table is as follows:
TABLE 1
Taking the INVITE message as an example, the following is an example of the INVITE message:
INVITE SIP media stream sender device code @ destination Domain name or IP Address Port SIP/2.0
To sip media stream sender device coding @ destination domain name
Content-L ength the byte length of a message entity
Contact: < sip: media stream receiver device encoding @ 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 recipient device encoding @ source domain name >; tag-e 3719a0b
Subject, media stream sender device code, sending end media stream sequence number, media stream receiver device code, receiving end media stream sequence number
Content-Type:APPLICATION/SDP
Max-Forwards:70
v＝0
o＝64010600002020000001 0 0IN IP4 192.168.1.10
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
For another example, a 200OK message is as follows:
SIP/2.0 200OK
via SIP/2.0/UDP source domain name or IP address
From < sip: media stream sender device code @ destination domain name >; tag 1ad9931d
To: < SIP: SIP server code @ source domain name >; tag 3094947605
Call-ID:wlss-11df50d7-730beb6350a5506aa8316d9dc100cf6b@192.168.1.2
CSeq:1INVITE
Contact: < sip: media stream receiver device encoding @ source IP address port >
Content-Type:APPLICATION/SDP
Content-L ength the byte length of a message entity
v＝0
o＝64010600002020000001 0 0IN IP4 192.168.1.10
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
Obviously, the above message includes the private network IP address and port number of the client (the streaming receiving device) in the NAT.
After the watermark mapping table is established, the superposition watermark device also monitors the media stream on the network port 2, inquires the watermark mapping table according to the destination IP address and the port number in the header of the media stream message, finds the IP address in the client terminal NAT corresponding to the stream receiving device (client terminal), and superposes the IP address as watermark information to the video image.
It is easy to understand that, the information of the superimposed watermark needs to decode the media stream to obtain a video image, then superimpose the watermark in the video image, and finally re-encode the video image superimposed with the watermark into the media stream to be transmitted, and details about the superimposition of the watermark are not repeated here. After the watermark is superimposed, the watermark superimposing device forwards the media stream to the network port 1, and then sends the media stream to the network to be received by the client.
In an embodiment of the present application, a method for superimposing a watermark on a video surveillance image further includes:
and when the target IP address and the port number in the header of the media stream message do not exist in the watermark mapping table, the watermark is not superposed.
In fact, if the destination IP address in the header of the media stream packet cannot be found in the watermark mapping table, it is determined that the stream receiving device is not a client but a media forwarding device in a lower domain, and then watermark superposition is not performed. Of course, in order to prevent leakage from the media forwarding device, some special information may be superimposed for reminding. Such as the name of the overlay forwarding device.
As a preferred embodiment of the present application, a method for superimposing a watermark on a video surveillance image in the present application, where an IP address in a corresponding client NAT is found as watermark information, and when the IP address is superimposed on a video image, the method further includes:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
In order to prevent the leakage caused by the video recording of the candid camera, the candid camera intentionally avoids the watermark, the embodiment densely distributes the watermark information in the video image, and the density principle can be calculated by line spacing, for example, every 100 pixels or 50 pixels, and is distributed in a row; or at a column pitch, for example every 100 pixels or 50 pixels, arranged in a column; or every 100 pixel row pitch and 100 pixel column pitch, densely distributed from the upper left corner to the lower right corner. The present application is not limited to a particular form of dense packing.
As a preferred embodiment of the present application, a method for superimposing a watermark on a video surveillance image in the present application, where an IP address in a corresponding client NAT is found as watermark information, and when the IP address is superimposed on a video image, the method further includes:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
For example, the transparency ranges from 0 to 100, 0 is opaque, and 100 is fully transparent, and in this embodiment, the transparency needs to be adjusted to be more than 90, which has a better effect.
The transparency of the watermark information in the video image is adjusted until the watermark information can not be normally sensed by human eyes, so that the video image can be watched by a user without being influenced, and the watermark information can be extracted by decoding the video image, thereby achieving the purpose of preventing video recording leakage.
As a preferred embodiment of the present application, a method for superimposing a watermark on a video surveillance image in the present application, where an IP address in a corresponding client NAT is found as watermark information, and when the IP address is superimposed on a video image, the method further includes:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
In order to warn the candid, and prevent the candid from happening, in the embodiment, obvious OSD watermark information is superimposed at a specified position of the video image, such as the upper left corner, so that when the decoding end displays the watermark information, the video image can be clearly seen, the video image is subjected to anti-leakage processing, and the effect of deterrence is achieved. Regarding the size of the OSD watermark, the size can be adjusted as required based on the standard that the OSD watermark is clearly visible in the upper left corner and does not affect the video picture. The contrast is adjusted according to the video image so that the contrast can be clearly displayed on the video image.
It should be noted that this embodiment may also be implemented at the decoding end, and after the decoding end receives the video stream, the decoding end takes the first I frame of several seconds, finds the position where the watermark is located, automatically increases the contrast, and if the watermark is found, extracts the watermark, and superimposes the OSD watermark on the designated position on the played video image.
The method for overlaying the watermark on the video monitoring image adds the IP address of a video-playing jukebox (client) as watermark information into the video image, and overlays the watermark in the video image in a dense mode by adjusting transparency so as to prevent a mobile phone from avoiding an OSD (on screen display) area when taking a picture. The watermark superimposing device of the embodiment can be deployed in the existing system, is very easy to deploy, and automatically superimposes watermark information. When the jukebox is in the private network, the address of the private network can be superposed, and when a plurality of jukeboxes are in the private network, even if the same public network address is shared, superposition of different private network addresses can be supported. And the watermark is automatically extracted and displayed in an OSD mode so as to achieve the warning and reminding functions. When the upper and lower level domains exist, the device automatically identifies whether the device is the terminal device connected with the client, and the upper level domain device does not print any watermark on the media stream sent to the lower level domain device, but only superimposes the watermark by the terminal device.
Corresponding to the above-mentioned method for superimposing a watermark on a video surveillance image, there is also provided an embodiment of a corresponding video surveillance image watermarking apparatus (i.e., the above-mentioned watermarking apparatus), as shown in fig. 3, the watermarking apparatus includes:
the registration message interception module is used for intercepting a registration message sent by a client to a system server side, analyzing the registration message and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
a negotiation message interception module for intercepting a negotiation message sent by a client to a system server side, analyzing the negotiation message and recording an IP address in a client NAT in a watermark mapping table;
and the watermark superposition module is used for monitoring a media stream sent by the server side of the system, inquiring the watermark mapping table according to a destination IP address and a port number in the header of the media stream message, finding out a corresponding IP address in the client NAT as watermark information, and superposing the watermark information to a video image.
Similarly, as a preferred embodiment of the present application, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information, and superimposes the watermark information onto the video image, the following operations are further performed:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
Similarly, as a preferred embodiment of the present application, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information, and superimposes the watermark information onto the video image, the following operations are further performed:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
Similarly, as a preferred embodiment of the present application, when the watermark superimposing module finds the corresponding IP address in the client NAT as the watermark information, and superimposes the watermark information onto the video image, the following operations are further performed:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
Similarly, as a preferred embodiment of the present application, the watermark superimposing module does not perform watermark superimposing when the destination IP address and the port number in the header of the media stream packet do not exist in the watermark mapping table.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, but these corresponding changes and modifications should fall within the protection scope of the appended claims.
Claims (10)
1. A method for overlaying watermarks on video monitoring images is used for overlaying watermarks on the video monitoring images in a video monitoring system, the video monitoring system comprises a system server and a client, and the method for overlaying the watermarks on the video monitoring images is characterized by comprising the following steps:
monitoring a registration message sent by a client to a system server side, analyzing the registration message, and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
monitoring a negotiation message sent by a client to a system server side, analyzing the negotiation message, and recording an IP address in a client NAT in a watermark mapping table;
and monitoring a media stream sent by a server side of the system, inquiring a watermark mapping table according to a destination IP address and a port number in a header of a media stream message, finding out a corresponding IP address in a client NAT as watermark information, and superposing the watermark information to a video image.
2. The method for superimposing watermarks on a video surveillance image according to claim 1, wherein the finding of the corresponding IP address in the client NAT as the watermark information to be superimposed on the video image further comprises:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
3. The method for superimposing watermark on a video monitor image according to claim 1 or 2, wherein the step of finding the corresponding IP address in the client NAT as watermark information to be superimposed on the video image further comprises:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
4. The method for superimposing watermarks on a video surveillance image according to claim 1, wherein the finding of the corresponding IP address in the client NAT as the watermark information to be superimposed on the video image further comprises:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
5. The method for overlaying a watermark on a video surveillance image as recited in claim 1, wherein the method for overlaying a watermark on a video surveillance image further comprises:
and when the target IP address and the port number in the header of the media stream message do not exist in the watermark mapping table, the watermark is not superposed.
6. A video monitoring image adds watermark device for video monitoring image adds watermark in the video monitoring system, the said video monitoring system includes system server and customer end, characterized by that, the said video monitoring image adds watermark device, including:
the registration message interception module is used for intercepting a registration message sent by a client to a system server side, analyzing the registration message and recording an external IP address and a port number of the NAT of the client in a watermark mapping table;
a negotiation message interception module for intercepting a negotiation message sent by a client to a system server side, analyzing the negotiation message and recording an IP address in a client NAT in a watermark mapping table;
and the watermark superposition module is used for monitoring a media stream sent by the server side of the system, inquiring the watermark mapping table according to a destination IP address and a port number in the header of the media stream message, finding out a corresponding IP address in the client NAT as watermark information, and superposing the watermark information to a video image.
7. The apparatus for superimposing a watermark on a video monitor image according to claim 6, wherein the watermark superimposing module further performs the following operations when finding the corresponding IP address in the client NAT as the watermark information to superimpose on the video image:
and uniformly superposing the watermark information to the video image according to a set dense distribution principle.
8. The apparatus for superimposing watermark on a video monitor image according to claim 6 or 7, wherein the watermark superimposing module further performs the following operations when finding the corresponding IP address in the client NAT as the watermark information to superimpose on the video image:
and adjusting the transparency of the watermark information in the video image to a set range, so that human eyes cannot normally perceive the watermark information superposed in the video image.
9. The apparatus for superimposing a watermark on a video monitor image according to claim 6, wherein the watermark superimposing module further performs the following operations when finding the corresponding IP address in the client NAT as the watermark information to superimpose on the video image:
OSD watermark information with set size and contrast is superposed at the appointed position of the video image.
10. The apparatus for watermarking video surveillance image according to claim 6, wherein the watermark superimposing module does not perform watermark superimposing when the destination IP address and the port number in the header of the media stream do not exist in the watermark mapping table.
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| CN111200762B (en) * | 2018-11-20 | 2022-10-21 | 慧盾信息安全科技（苏州）股份有限公司 | Watermarking and tracing system and method based on real-time online video sharing and browsing |
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