WO2009065361A1 - Système de traitement de filigrane numérique, procédé d'incorporation et de détection de filigrane numérique et appareil apparenté - Google Patents

Système de traitement de filigrane numérique, procédé d'incorporation et de détection de filigrane numérique et appareil apparenté Download PDF

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Publication number
WO2009065361A1
WO2009065361A1 PCT/CN2008/073114 CN2008073114W WO2009065361A1 WO 2009065361 A1 WO2009065361 A1 WO 2009065361A1 CN 2008073114 W CN2008073114 W CN 2008073114W WO 2009065361 A1 WO2009065361 A1 WO 2009065361A1
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WIPO (PCT)
Prior art keywords
information
frame
watermark
digital watermark
auxiliary information
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PCT/CN2008/073114
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English (en)
Chinese (zh)
Inventor
Yongping Zhang
Tao HAO
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Huawei Technologies Co., Ltd.
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Filing date
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009065361A1 publication Critical patent/WO2009065361A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/0085—Time domain based watermarking, e.g. watermarks spread over several images

Definitions

  • Digital watermark processing system digital watermark embedding and detecting method and device
  • the present invention relates to the field of digital multimedia technologies, and in particular, to a digital watermark processing system, a digital watermark embedding and detecting method and apparatus.
  • Digital multimedia content such as images, audio, video, etc.
  • Digital multimedia content has become a part of our lives with its powerful portability, efficiency, speed and accuracy.
  • many powerful multimedia modification tools have emerged. The emergence of these tools and the popularity of the network have made the modification of pirated and multimedia content a breeze.
  • the traditional conditional access system can authenticate users who handle multimedia content in the system. However, once the user connects to the system, the multimedia content in the system cannot be effectively protected, and the user can tamper with it at will. How to ensure that digital video content is not illegally tampered with, so that digital video content is trusted by the judiciary, is an urgent problem to be solved.
  • Digital watermarking technology refers to embedding identification signals in digital multimedia content by means of signal processing.
  • the identification signals may be invisible or visible.
  • Digital watermarking technology is an important branch of research direction of information hiding technology.
  • the security of digital watermarking is solved by traditional encryption technology. By encrypting the watermark embedding location or encrypting the watermark information itself, the security of the digital watermarking system can be solved.
  • a watermark embedding method for still images in which a user uses a key to encrypt a piece of information unrelated to image content, such as time, place, etc., and selects the obtained encrypted information.
  • the watermark is embedded in the location and the watermark information is embedded in the corresponding location.
  • the still image processed by the watermark embedding method can detect the tampering of the still image by detecting, and the position of the watermark embedding is determined by an encrypted information, so that it is not easily cracked by the tamper, and the embedded watermark information is further improved. Safety.
  • the watermark embedding position of each frame selected by the information is the same, if the tampering person falsifies the inter-frame relationship, such as After the frame is deleted or the position of a frame is changed, the watermark information will not change, so the tampering between frames cannot be detected.
  • a digital watermark processing system a digital watermark embedding device, a digital watermark detecting device, a digital watermark embedding method, and a digital watermark detecting method are provided, which can detect tampering of inter-frame relationships.
  • a digital watermark processing system comprising:
  • a digital watermark embedding apparatus configured to receive frame number information of an original multimedia frame and the original multimedia frame, and determine first auxiliary information according to frame number information of the original multimedia frame, according to the first auxiliary information Embedding digital watermark information in the original multimedia frame to obtain a multimedia frame embedded in the digital watermark
  • the digital watermark detection apparatus is configured to receive the frame number information of the multimedia frame embedded in the digital watermark and the multimedia frame embedded in the digital watermark, and determine the second auxiliary information according to the frame serial number information of the multimedia frame embedded in the digital watermark; And detecting digital watermark information in the digital watermark embedded multimedia frame according to the second auxiliary information.
  • a digital watermark embedding device comprising:
  • an auxiliary information processing module configured to receive frame serial number information of the original multimedia frame, and determine first auxiliary information according to the frame serial number information of the original multimedia frame;
  • the watermark embedding module is configured to receive the original multimedia frame and the first auxiliary information, and embed the digital watermark information in the original multimedia frame according to the first auxiliary information.
  • a digital watermark detecting apparatus comprising:
  • an auxiliary information processing module configured to receive frame serial number information of a multimedia frame embedded with a digital watermark, according to The frame number information of the multimedia frame embedded in the digital watermark determines the second auxiliary information
  • a watermark detection module configured to acquire the second auxiliary information from the auxiliary information processing module, and detect the digital watermark information in the embedded digital watermarked multimedia frame according to the second auxiliary information
  • a digital watermark embedding method comprising:
  • a digital watermark detection method comprising:
  • the method, the system and the device provided by the embodiment of the present invention determine the first auxiliary information according to the frame serial number information of the original multimedia frame, and embed the digital in the original multimedia frame according to the first auxiliary information.
  • Watermark information to obtain a multimedia frame embedded in a digital watermark.
  • FIG. 1 is a structural diagram of a digital watermark processing system according to an embodiment of the present invention.
  • FIG. 2 is a structural diagram of a digital watermark embedding apparatus according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of an auxiliary information processing module according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of an auxiliary information determining unit according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of an auxiliary information determining unit according to another embodiment of the present invention.
  • FIG. 6 is a structural diagram of a digital watermark detecting apparatus according to an embodiment of the present invention
  • FIG. 7 is a specific flowchart of a digital watermark embedding method according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a method for determining a watermark embedding coefficient according to an embodiment of the present invention.
  • FIG. 9 is a specific flowchart of a watermark detecting method according to an embodiment of the present invention.
  • the embodiment of the present invention mainly determines the auxiliary information embedded in the watermark according to the frame serial number and the security information in the multimedia content, and embeds the auxiliary information as a watermark embedding factor.
  • the watermark information embedded in each frame of the multimedia content is associated with the frame number of the frame, and when the inter-frame tampering of the multimedia content occurs, such as the frame being exchanged or deleted, the embedded watermark information will be changed, thereby For the detection of the watermark, tampering of the relationship between the frames is detected.
  • FIG. 1 is a structural diagram of a digital watermark processing system according to an embodiment of the present invention.
  • the system includes: [45] a digital watermark embedding apparatus 101, configured to receive an original multimedia frame and the original multimedia frame. Frame number information, determining first auxiliary information according to frame number information of the original multimedia frame, embedding digital watermark information in the original multimedia frame according to the first auxiliary information, to obtain a multimedia frame embedded with the digital watermark;
  • the digital watermark detecting apparatus 102 is configured to receive a frame number information of the multimedia frame embedded in the digital watermark and the multimedia frame embedded in the digital watermark, and determine the second auxiliary information according to the frame serial number information of the multimedia frame embedded in the digital watermark And detecting the digital watermark information in the digital watermark embedded multimedia frame according to the second auxiliary information.
  • FIG. 2 is a structural diagram of a digital watermark embedding device according to an embodiment of the present invention.
  • the digital watermark embedding apparatus of the embodiment of the present invention includes: an auxiliary information processing module 201 and a watermark embedding module 202;
  • the auxiliary information processing module 201 is configured to receive frame sequence number information of the original multimedia frame, and determine first auxiliary information according to frame number information of the original multimedia frame;
  • the watermark embedding module 202 is configured to receive the original multimedia frame and the first auxiliary information, and embed the digital watermark information in the original multimedia frame according to the first auxiliary information.
  • the watermark embedding module 202 is specifically configured to determine an intra prediction residual obtained by encoding the original multimedia frame as a watermark generation domain, and obtain the digital watermark information from the watermark generation domain, or Determining the first auxiliary information as the digital watermark information; determining a watermark embedding coefficient in the original multimedia frame according to the first auxiliary information, and embedding the digital watermark information in the watermark embedding coefficient.
  • the auxiliary information processing module 201 is further configured to receive security information, and determine the first auxiliary information according to the security information and frame serial number information of the original multimedia frame.
  • FIG. 3 is a structural diagram of the auxiliary information processing module according to the embodiment of the present invention.
  • the auxiliary information processing module 201 specifically includes:
  • a frame number receiving unit 301 configured to receive frame sequence number information of the original multimedia frame
  • the auxiliary information determining unit 303 is configured to receive the frame serial number information of the original multimedia frame sent by the frame serial number receiving unit 301, and determine the first auxiliary information according to the frame serial number information of the original multimedia frame, and Sended to the watermark embedding module 202.
  • the auxiliary information processing module 201 may further include:
  • the security information receiving unit 304 is configured to receive the security information, and send the information to the auxiliary information determining unit 303.
  • the auxiliary information determining unit 303 further receives the security information sent by the security information receiving unit 304, and determines the first auxiliary information according to the security information and the frame serial number information of the original multimedia frame.
  • the auxiliary information processing module may further include:
  • the frame number processing unit 302 is configured to receive the security information, and after the frame number receiving unit 301 determines that the original multimedia frame is the last frame, the receiving the frame number receiving unit 301 sends the The frame number information of the original frame of the original frame, determining the verification frame number of the original frame of the last frame according to the security information and the frame number information of the original frame of the last frame, and using the verification frame number as The frame number information of the last frame is sent to the auxiliary information determining unit 303;
  • the security information receiving unit 304 is further configured to send the security information to the frame serial number processing unit 302.
  • the auxiliary information determining unit 303 further receives the frame serial number information sent by the frame serial number processing unit 302.
  • the specific process of calculating the verification frame number is: converting the security information into decimal and subtracting the frame number of the original frame of the last frame, and subtracting the result from the absolute Value, the verification frame number is obtained.
  • FIG. 4 is a structural diagram of the auxiliary information determining unit according to the embodiment of the present invention.
  • the auxiliary information determining unit 303 specifically includes:
  • the parameter receiving subunit 401 is configured to receive the frame serial number processing unit 302 or the frame serial number receiving unit.
  • an encryption subunit 402 configured to acquire frame number information of the original multimedia frame and the security information from the parameter receiving subunit 401; and use the security information to frame number information of the original multimedia frame. Performing encryption to obtain the first auxiliary information;
  • an auxiliary information sending subunit 403 configured to receive the first auxiliary information sent by the encryption subunit
  • auxiliary information determining unit 303 may also be as shown in FIG. 5, which is a structural diagram of the auxiliary information determining unit according to another embodiment of the present invention.
  • the auxiliary information determining unit 303 includes:
  • the parameter receiving subunit 501 is configured to receive frame sequence information of the original multimedia frame sent by the frame sequence number processing unit 302 or the frame sequence number receiving unit 301; and receive the security information receiving unit 30 4 to send The security information;
  • an operation subunit 502 configured to acquire frame number information of the original multimedia frame and the security information from the parameter receiving subunit 501; and the security information and frame number information of the original multimedia frame Converting to a binary number, and complementing the security information and one of the frame number information of the original multimedia frame with less binary digits, so that the security information and the frame number information of the original multimedia frame are binary The number of bits is the same; the security information of the same binary digit and the frame serial number information of the original multimedia frame are subjected to a modulo two addition operation, or a logical OR operation is performed to obtain the first auxiliary information.
  • an auxiliary information sending subunit 503 configured to obtain the first auxiliary information from the operation subunit 502
  • the digital watermark embedding apparatus of the embodiment of the present invention is described above.
  • the digital watermark detecting apparatus of the embodiment of the present invention is described below for detecting the watermark embedding multimedia content processed by the digital watermark embedding apparatus of the embodiment of the present invention. Whether it has been tampered with.
  • FIG. 6 The specific structure of the device is shown in FIG. 6, and includes: an auxiliary information processing module 601 and a watermark detection module 60.
  • the auxiliary information processing module 601 is configured to receive frame serial number information of the multimedia frame embedded in the digital watermark, and determine second auxiliary information according to the frame serial number information of the multimedia frame embedded in the digital watermark;
  • the watermark detection module 602 is configured to acquire the second auxiliary information from the auxiliary information processing module 601, and detect the digital watermark information in the embedded digital watermarked multimedia frame according to the second auxiliary information. .
  • the auxiliary information processing module 601 may be further configured to receive security information, and determine the second auxiliary according to the security information and frame number information of the embedded digital watermarked multimedia frame.
  • the specific structure of the auxiliary information processing module is identical to the structure of the auxiliary information processing module in the watermark embedding apparatus described above, except that the determined second auxiliary information is sent to the watermark detecting module instead of being sent to The watermark embedding module is not mentioned here.
  • the watermark detection module 602 is specifically configured to determine, according to the second auxiliary information, a watermark extraction coefficient from the embedded digital watermarked multimedia frame, and extract digital watermark information from the watermark extraction coefficient. Determining the intra prediction residual obtained by decoding the digital watermark embedded multimedia frame as a reference watermark generation domain, obtaining reference watermark information from the reference watermark generation domain, or using the second auxiliary information as reference watermark information And comparing the extracted digital watermark information with the reference watermark information; if the comparison result of the reference watermark information and the extracted digital watermark information is different, obtaining a detection result that the embedded digital watermarked multimedia frame is tampered with; If the comparison result of the reference watermark information and the extracted digital watermark information is the same, the detection result that the multimedia frame embedded in the digital watermark is not falsified is obtained.
  • the digital watermark embedding apparatus and the digital watermark detecting apparatus of the embodiment of the present invention are described above.
  • the digital watermark embedding method of the embodiment of the present invention will be described below.
  • the digital watermark embedding method of the embodiment of the present invention is to receive the original multimedia frame and the The frame number information of the original multimedia frame is determined; the first auxiliary information is determined according to the frame serial number information of the original multimedia frame; and the digital watermark information is embedded in the original multimedia frame according to the first auxiliary information.
  • the specific process is shown in Figure 7;
  • Step 701 Determine a watermark embedding domain and a watermark generating domain in the original multimedia frame, and determine the digital watermark information according to the watermark generating domain.
  • determining an intra prediction residual obtained by encoding the original multimedia frame as the watermark generation domain, and determining an inter prediction residual obtained by encoding the original multimedia frame as the watermark embedding domain can use various encoders according to actual needs; in addition, in the coding ⁇ , according to the needs of the watermark algorithm, parameters obtained in various coding processes can be selected as the watermark embedding domain and the watermark generation domain.
  • Determining the inter prediction residual as a watermark embedding domain, determining an intra prediction residual as a watermark generation domain, the watermark embedding domain is a location set in which the watermark can be embedded, and the watermark generating domain is a location for generating watermark information .
  • determining the digital watermark information based on the watermark generation domain may be any information in the watermark generation domain as digital watermark information. Of course, any other information can also be used as the watermark information, such as the first auxiliary information determined in the next step.
  • Step 702 Determine first auxiliary information according to frame sequence information and security information of the original multimedia frame.
  • the watermark embedding device encodes the original frame signal, and the frame number information of the encoded original multimedia frame is encoded.
  • the processing is sent to the auxiliary information processing module, and the auxiliary information processing module determines the first auxiliary information and returns it to the watermark embedding device by using the security information and the frame serial number information of the original multimedia frame.
  • the first auxiliary information by using the frame number information of the original multimedia frame separately, or directly use the frame serial number as the first auxiliary information.
  • Step 703 Determine a watermark embedding coefficient in the watermark embedding domain according to the first auxiliary information
  • each bit of the binary first auxiliary information is mapped one by one to each position in the watermark embedding domain, and the watermark embedding domain is determined.
  • the corresponding first auxiliary information bit is "the coefficient at the position of ⁇ is the watermark embedding coefficient, as shown in Fig. 8, the coefficient at the gray position in the figure is selected as the watermark embedding coefficient. Of course, the position at "0" is selected. Coefficients are also possible.
  • Step 704 embedding the digital watermark information in the watermark embedding coefficient.
  • the digital watermark information generated from the watermark generation domain is embedded into the determined watermark embedding coefficient by a certain embedding method, such as quantization or adjustment of the embedding coefficient, to obtain a multimedia frame embedded with the digital watermark information.
  • a certain embedding method such as quantization or adjustment of the embedding coefficient
  • the first auxiliary information may be directly embedded as digital watermark information into the determined watermark embedding coefficient to obtain a watermark embedded multimedia frame.
  • bin2dec() converts a binary number to a decimal number
  • key is a security message
  • abs () is an absolute value.
  • the last frame is judged so that the last frame or frames of the multimedia content can be deleted, and the watermark detecting device can also detect the tampering. Of course, it is also possible not to judge and process the last frame. .
  • the method of determining the first auxiliary information may also be performed without using an encryption algorithm, but by a relatively simple operation.
  • the frame serial number information and the security information of the original multimedia frame are converted into binary numbers, and then the frame number information of the converted original multimedia frame and the number of bits of the security information are compared, and the one with a smaller number of bits is complemented.
  • the security information is identical to the binary digits of the frame number information of the original multimedia frame.
  • the complement is to add "0" before the binary bit, or to loop the binary bit, for example, the binary number of the frame number information of the original multimedia frame is 10, and the binary digit of the security information is 8, Add two "0"s before the binary bits of the security information, or add the lowest 2 bits of the binary bits of the security information to the highest 2 digits of the binary bits of the security information, ie 9, 10 bits, so that the security information becomes Is a 10-bit binary number. Then the binary bit The same number of the security information and the frame number information of the original multimedia frame are subjected to a binary operation, and the modulo 2 addition or the logical OR operation may be used to determine the calculated result as the first auxiliary information.
  • step 703 in order to ensure that as many watermark embedding coefficients can be selected as possible, in the binary bits of the first auxiliary information, "the number of ⁇ is less than the number of "0", and "0" can be selected.
  • the coefficient in the position is used as the watermark embedding coefficient; or in step 702, the "0" and the “number” in the encrypted binary information are directly determined, and if the number of "1" is less than the number of "0", then Turn “ ⁇ into “0” and "0” into “1".
  • the multimedia content After embedding the digital watermark information in the multimedia content according to the above method, the multimedia content can be detected as follows:
  • Step 901 Determine a reference watermark generation domain and a watermark extraction domain in the multimedia frame embedded in the digital watermark, and determine reference watermark information according to the reference watermark generation domain;
  • the multimedia frame embedded in the digital watermark is detected, corresponding to the embedding, and the inter prediction residual obtained by decoding the multimedia frame embedded in the digital watermark is determined as the extraction domain of the watermark, used to extract the watermark information;
  • the intra prediction residual obtained by decoding the digital watermarked multimedia frame is determined as a generation domain of the reference watermark, and is used for determining the reference watermark information.
  • the determination of the reference watermark information is also arbitrary, as long as it is the same as the method of detecting ⁇ determining the digital watermark.
  • Step 902 Determine second auxiliary information according to frame serial number information and security information of the multimedia frame embedded in the digital watermark; [107] The determining process of the specific second auxiliary information is the same as the step 702 in the watermark embedding process, and is not described here. Similarly, the second auxiliary information may be directly determined according to the frame serial number information of the multimedia frame embedded in the digital watermark. Or directly using the frame number information of the multimedia frame embedded in the digital watermark as the second auxiliary information.
  • Step 903 Extract digital watermark information from the watermark extraction domain according to the second auxiliary information.
  • extracting the watermark information is to extract the embedded watermark information from the watermark extraction coefficient determined according to the second auxiliary information, and the process of determining the watermark extraction coefficient according to the second auxiliary information is the same as step 703 in the watermark embedding process, and is no longer Praise.
  • Step 904 Compare the reference watermark information with the extracted digital watermark information to obtain a detection result.
  • a water-printed video has a total of 100 frames, and if the transmission process, the sixth frame and the 90th frame are exchanged.
  • the watermark embedding position and the extraction position are misaligned, so the extracted digital watermark information is definitely different from the embedded ⁇ .
  • the determination of the reference watermark is the same as the method of determining the original watermark information embedded in ⁇ , so the reference watermark and the embedded digital watermark are the same.
  • the watermark information extracted from the watermark extraction domain is compared with the reference watermark information determined by the reference watermark generation domain, and the result of the comparison is that the two watermark information are different, indicating that the video content has been tampered with. Similarly, the same is true when the 90th frame is detected.
  • the above embodiment is an example of the video content.
  • the embodiment of the present invention can be applied to any multimedia content, such as audio, video content, etc., and the auxiliary information processing module according to the embodiment of the present invention can also be present.
  • Any watermarking system can be used in combination.
  • any encryption algorithm can be combined.
  • One embodiment of this method is to use a frame.
  • the serial number is used as a parameter for determining the auxiliary information, and the tampering of the relationship between the frames can be detected by embedding and detecting the watermark by the auxiliary information including the frame number information.
  • the specific processing method for the auxiliary information may be an embodiment of the present invention according to any method that can be thought of by those skilled in the art.
  • the embodiment of the present invention determines first auxiliary information according to frame number information of the original multimedia frame, and embeds digital watermark information in the original multimedia frame according to the first auxiliary information, to obtain A multimedia frame embedded with a digital watermark. Determining second auxiliary information according to frame number information of the embedded digital watermarked multimedia frame; and detecting digital watermark information in the digital watermark embedded multimedia frame according to the second auxiliary information. Therefore, the digital watermark information embedded in the original multimedia frame is associated with the frame number thereof.
  • the watermark information embedded in the original multimedia frame is changed, and after the detection, the reference watermark information and The extracted digital watermark information is compared, and tampering of the relationship between the frames can be detected.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)
  • Editing Of Facsimile Originals (AREA)

Abstract

L'invention porte sur un système de traitement de filigrane numérique, sur un procédé d'incorporation et de détection de filigrane numérique et sur un appareil apparenté. Le procédé comprend les opérations consistant à : déterminer les informations de premier assistant selon les informations de numéro d'ordre de trame de la trame multimédia d'origine, et incorporer les informations de filigrane numérique dans la trame multimédia d'origine selon les informations de premier assistant, puis obtenir la trame multimédia incorporant le filigrane numérique ; déterminer les informations de second assistant selon les informations de numéro d'ordre de trame de la trame multimédia incorporant le filigrane numérique, et détecter les informations de filigrane numérique de la trame multimédia incorporant le filigrane numérique selon les informations de second assistant. Lors de la détection du filigrane, la violation de la relation intra-trame pourrait être détectée.
PCT/CN2008/073114 2007-11-23 2008-11-19 Système de traitement de filigrane numérique, procédé d'incorporation et de détection de filigrane numérique et appareil apparenté WO2009065361A1 (fr)

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