CN103929646A - Device and method used for insertion, detection and extraction of watermark - Google Patents
Device and method used for insertion, detection and extraction of watermark Download PDFInfo
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Abstract
The invention discloses a device and method used for insertion, detection and extraction of a watermark. The device comprises an insertion device used for inserting the watermark and a detection and extraction device used for detecting and extracting the watermark, watermark information is inserted into an I-frame extended data domain and / or a user data domain through the insertion device to serve as a load of the extended data domain and / or the user data domain, scrambling processing is carried out on an I frame, the encryption level is lower, protection of a control word (CW) secrete key is achieved, cracking is difficult, and the I frame serving as a reference frame of following frames, system processing pressure of other frames is reduced.
Description
Technical field
The present invention relates to pay-TV field, relate in particular to the device and method that carries out watermark insertion, extraction to meeting the data flow of MPEG2 standard.
Background technology
Watermark belongs to a kind of technology of Information hiding; be widely used in digital media data; by hide the information with certain sense in media data (as audio frequency, video, image); thereby can reach the protection to trace to the source tracking, the digital publishing rights of original media data; and can, to the loss to some extent of original media data quality, can not arrived by people's audiovisual yet.
MPEG2 is as a kind of Audio Video coding Standard, the important effect that has in Contemporary Digital television broadcasting field.Existing technology has realized watermark information has directly been inserted in frame of video, finds, and rejects, and after rejecting, also can not affect the quality of former data flow but direct-insert watermark information is easy to victim.And traditional scrambling based on MPEG2 transport stream and descrambling mode adopt conventionally to the disturbing of load of TS or the disturbing of load to PES.Therefore, a little less than existing water mark method fail safe very, be easy to be attacked and be not found, do not reach the requirement in practical application.
Therefore,, along with developing rapidly and demand to digital copyright protecting of Digital Television, urgently develop the problem that a kind of more reliable, safer water mark method and system exist in practice for solving pay-TV.
Summary of the invention
The object of the invention is in order to solve above-mentioned problems of the prior art, proposed, for inserting the insertion apparatus of watermark, to comprise frame alignment device (201), from the data flow based on MPEG2 standard, orient the original position of I frame and the scope of I frame data; Watermark constructor (301), is configured to watermark information (104) by original watermark data; Expansion and user data generator (302), the load using watermark information (104) as described growth data territory and/or user data fields; Inserter (303), is inserted into growth data territory and/or user data fields (105) in I frame; Encryption equipment (202), is used encryption key (107) to be encrypted and/or scrambling the I frame data (106) with watermark, forms ciphertext I frame data (108); Integrator (203), is integrated into the ciphertext I frame data (108) with watermark in data flow.
Detection and Extraction device for detection of extraction watermark proposed by the invention when above-mentioned insertion apparatus inserts after watermark, can extract watermark from the described data flow based on MPEG2 standard, comprising: receiver module (A), receives the data flow with watermark; Descrambling module (B), comprises the locating module (B1) that the I frame in the data flow with watermark is positioned, to location after with the I frame of watermark carry out descrambling descrambling module (B2) and reception corresponding descramble key deciphering module (B3); Extraction module (C), navigates to growth data territory and/or user data fields in the I frame data with watermark from descrambling, and take out watermark information from the load of growth data territory and/or user data fields; Output module (D), output watermark information.
Proposed by the invention for inserting the insertion method of watermark, comprise the steps:
Step S1, resolves the grammer based on MPEG2 data flow, the I frame of retrieval and locator data stream;
Step S2, judges whether I frame exists growth data territory and/or user data fields, if there is not execution step 3; If exist, perform step 4;
Step S3, structure growth data territory and/or user data fields, insert growth data territory and/or user data fields by watermark, then the growth data territory with watermark and/or user data fields be embedded in I frame;
Step S4, is inserted into watermark in the growth data territory and/or user data fields of I frame;
Step S5, utilizes Control Word to carry out scrambling processing to I frame;
Step S6, circulation step S2 to S5 processes a plurality of I frames.
Detection and Extraction method for detection of extraction watermark proposed by the invention, comprises the steps:
Step Q1: the grammer to the data flow based on MPEG2 standard is resolved, I frame and the Entitlement Control Message of retrieval and locator data stream;
Step Q2: process Entitlement Control Message, draw decryption key, according to decryption key, I frame is carried out to scramble process, recover the data of former I frame;
Step Q3: navigate to extending user territory and/or user data fields from the data of former I frame.
Step Q4: extract watermark information from the load of growth data territory and/or user data fields;
Step Q5: circulation step Q1 to Q4, from MPEG2 data flow, process all I frames, and extract watermark from I frame, form watermark sequence.
Proposed by the invention for inserting the device of watermark and Detection and Extraction watermark, comprise above-mentioned Detection and Extraction device and insertion apparatus, proposed by the invention for inserting the method for watermark and Detection and Extraction watermark, comprise above-mentioned insertion method and Detection and Extraction method.
The present invention, by the institutional framework of video flowing sequence in analysis of MPEG 2 standards, utilizes the absolute coding characteristic of I frame, and growth data territory and the combination of user data fields three aspects: that I frame is carried out in independently disturbing processing and I frame realize watermark function.Analyze and locate all I frames in original video stream, watermarked expansion and user data fields in described I frame, the disturbing of I frame with watermark (other B or P frame are without disturbing) by after embedding, realizes watermark function with this.The quality of the original MPEG2 data flow of not loss of the present invention has the protection of disturbing key (Control Word) simultaneously, has very strong disguise and fail safe, is applicable to the protection to Information hiding and copyright, is specially adapted to pay-TV broadcast world.
Accompanying drawing explanation
Below, the present invention is described in detail for contrast accompanying drawing and preferred embodiment, wherein:
Fig. 1 is the structural representation of Detection and Extraction device of the present invention;
Fig. 2 is the structural representation of insertion apparatus of the present invention;
Fig. 3 is the flow chart that the present invention inserts watermark;
Fig. 4 is the flow chart of Detection and Extraction watermark of the present invention.
Embodiment
Below in conjunction with drawings and Examples, invention is described in detail.Should be appreciated that the explanation of the specific embodiment technical scheme in order to explain that the present invention proposes only, and non-limiting the present invention.
As shown in Figure 1 and Figure 2, proposed by the inventionly for inserting the device of watermark and Detection and Extraction watermark, comprise insertion apparatus and Detection and Extraction device.Wherein the data flow based on MPEG2 standard comprises audio frequency, video and for data stream being carried out to the data such as ECM, EMM of descrambling.Insertion apparatus comprises frame alignment device 201, watermark constructor 301, expansion and user data generator 302, inserter 303, encryption equipment 202, integrator 203, signal output part 109.Detection and Extraction device comprises receiver module A, descrambling module B, extraction module C, output module D.
Locator 201 is position and the length for the I frame in locator data stream, from data flow, orient the original position of I frame and the scope of I frame data, according to the syntactic structure of MPEG2 video bit stream, data flow is divided into from top to bottom according to high layer tissue: Video Sequence Layer-> image sets layer-> image layer.Wherein every one deck all comprises the initial code that a unique hexadecimal bit string forms, can distinguish different levels according to this initial code, if the sequence head initial code of Video Sequence Layer is 000001B3, a figure group initial code of image sets layer is 000001B8, and the initial code of image layer is 00000100.The image layer of the I framing bit of data flow under image sets layer wherein, its initial code is 00000100, and each image sets comprises a plurality of frame of video, and first frame of video is exactly I frame conventionally.Watermark constructor 301 is configured to watermark information 104 by watermarking algorithm by original watermark data, then by expansion and user data generator 302, watermark information is embedded in to the load in I frame growth data territory, or the load of user data fields, also can both embed, growth data territory is that hexadecimal bit string is 000001B5, user data fields 105 for hexadecimal bit string be 000001B2.While there is not growth data territory or user data fields in I frame, expansion and user data fields generator also can first produce growth data territory or user data fields, for use.Inserter 303 is according to circumstances inserted into growth data territory and/or user data fields 105 in I frame, before can being inserted into the Picture Data in I frame data or after Picture Data.Then encryption equipment 202 is used encryption key 107 to carry out scrambling I frame data 106, or be encrypted, in the present invention, adopt Control Word as encryption key, form ciphertext I frame data 108, under the assurance of Control Word, watermark has very strong disguise and fail safe, watermark information is embedded in expansion, the user data fields in I frame data simultaneously, can not affect former MPEG2 video frequency data quality, makes again the robustness of watermark be well solved.Then by integrator 203, ciphertext I frame data 108 are integrated in data flow, finally by signal output part 109 output streams.Receiver module A receives the data flow with watermark, descrambling module B has comprised three submodules, respectively locating module B1, descrambling module B2, deciphering module B3, wherein the operation principle of locating module B1 and the locator in insertion apparatus 201 are similar, and the I frame for the treatment of in the data flow of watermark positions.Then descrambling module obtains the information relevant to decruption key from receiver module A, ECM data for example, then deciphering module B3 carries out computing to key information (ECM), obtain descramble key, offer descrambling module, descrambling module B2 carries out descrambling by descramble key to I frame, in the present invention, descramble key adopts Control Word, by extraction module C from descrambling with being that hexadecimal bit string 000001B2 navigates to growth data territory and/or user data fields by initial code in the I frame data of watermark, and take out watermark information from the load of growth data territory and/or user data fields, finally by output module D output watermark information.
As shown in Figure 3, Figure 4, proposed by the invention for inserting the method for watermark and Detection and Extraction watermark, comprise insertion method and Detection and Extraction method.
The detailed step of insertion method comprises:
Step S1, resolves the grammer of the data flow based on MPEG2 standard, the I frame of retrieval and locator data stream;
Step S2, judges whether I frame exists growth data territory and/or user data fields, if there is not execution step 3; If exist, perform step 4;
Step S3, structure growth data territory and/or user data fields, insert growth data territory and/or user data fields by watermark, then the growth data territory with watermark and/or user data fields be embedded in I frame;
Step S4, is inserted into watermark in the growth data territory and/or user data fields of I frame;
Step S5, utilizes Control Word to carry out scrambling processing to I frame;
Step S6, circulation step S2 to S5 until all I frames be disposed;
The detailed step of Detection and Extraction method comprises:
Step Q1: the grammer to data flow is resolved, I frame and the Entitlement Control Message of retrieval and locator data stream;
Step Q2: process Entitlement Control Message, draw decryption key, according to decryption key, I frame is carried out to scramble process, recover the data of former I frame;
Step Q3: navigate to extending user territory and/or user data fields from the data of former I frame.
The location of growth data territory and user data fields is all to be retrieved and located by unique initial code, because expansion and user data fields have unique hexadecimal initial code separately, is respectively 000001B5 and 000001B2.In watermark insertion process, watermark information can embed growth data territory, also can embed user data fields, can also both embed, and the present invention does not limit and uses any mode to embed, but the mode that need to select in conjunction with insertion apparatus and determining.The mode adopting according to insertion apparatus, selects corresponding initial code value (as the initial code hexadecimal 000001B2 of user data fields), then, in former I frame data, retrieves the initial code conforming to initial code value (as 000001B2).From the initial code (as 000001B2) retrieving, starting to the data next initial code is the load of extending user territory and/or user data fields, in this load with watermark information.
Step Q4: extract watermark information from the load of growth data territory and/or user data fields;
Step Q5: circulation step Q1 to Q4, from MPEG2 data flow, process all I frames, and extract watermark from I frame, form watermark sequence.In watermark sequence, each watermark information can be identical (as copyright information) or different (as finger print informations).
The detailed step of the I frame in above-mentioned steps S1, Q1 in retrieval and locator data stream is:
Step SQ1: according to the syntactic structure of MPEG2 video bit stream, the data flow based on MPEG2 standard is divided into Video Sequence Layer, image sets layer, image layer from top to bottom, every one deck is provided with unique hexadecimal bit string as initial code;
Step SQ2: the initial code of retrieving images layer, the initial code of retrieving images group layer, continue first initial code of retrieving images group layer hypograph layer, second initial code that continues retrieving images layer, it is I frame data that first initial code of described image layer starts to the data between second initial code.
In the process of above-mentioned insertion watermark; due to the reference frame of the I frame in image layer as follow-up B or P frame; so only need to process and just can realize the protection to other picture frames disturbing of I frame, reduce the scrambling of Detection and Extraction device and the expense of descrambling aspect simultaneously.And encryption scrambling rank of the present invention is lower, arrived frame rank, be embedded in the watermark in frame, be difficult to be found or attack by extraneous, guaranteed the fail safe of watermark information, and watermark information is just put in extending user territory and/or user data fields after encrypting by watermarking algorithm, watermarking algorithm is independent of whole insertion extraction system and method, and fail safe, reliability are higher.
Claims (9)
1. for inserting an insertion apparatus for watermark, it is characterized in that, comprising:
Frame alignment device (201) is oriented the original position of I frame and the scope of I frame data from the data flow based on MPEG2 standard;
Watermark constructor (301), is configured to watermark information (104) by original watermark data;
Expansion and user data generator (302), the load using watermark information (104) as described growth data territory and/or user data fields;
Inserter (303), is inserted into growth data territory and/or user data fields (105) in I frame;
Encryption equipment (202), is used encryption key (107) to be encrypted and/or scrambling the I frame data (106) with watermark, forms ciphertext I frame data (108);
Integrator (203), is integrated into the ciphertext I frame data (108) with watermark in data flow.
2. as claimed in claim 1ly for inserting the insertion apparatus of watermark, it is characterized in that, while there is not growth data territory or user data fields in I frame, expansion and the generation of user data generator can be inserted in growth data territory or the user data fields in I frame data.
3. as claimed in claim 1 or 2ly for inserting the insertion apparatus of watermark, it is characterized in that, before described growth data territory and/or user data fields (105) are inserted into the Picture Data in I frame data or after Picture Data.
4. for detection of a Detection and Extraction device that extracts watermark, it is characterized in that, when insertion apparatus as claimed in claim 3 inserts after watermark, can from the described data flow based on MPEG2 standard, extract watermark, described Detection and Extraction device comprises:
Receiver module (A), receives the data flow with watermark;
Descrambling module (B), comprises the locating module (B1) that the I frame in the data flow with watermark is positioned, to location after with the I frame of watermark carry out descrambling descrambling module (B2) and reception corresponding descramble key deciphering module (B3);
Extraction module (C), navigates to growth data territory and/or user data fields in the I frame data with watermark from descrambling, and take out watermark information from the load of growth data territory and/or user data fields;
Output module (D), output watermark information.
5. for inserting an insertion method for watermark, it is characterized in that,
Step S1, resolves the grammer based on MPEG2 data flow, the I frame of retrieval and locator data stream;
Step S2, judges whether I frame exists growth data territory and/or user data fields, if there is not execution step 3; If exist, perform step 4;
Step S3, structure growth data territory and/or user data fields, insert growth data territory and/or user data fields by watermark, then the growth data territory with watermark and/or user data fields be embedded in I frame;
Step S4, is inserted into watermark in the growth data territory and/or user data fields of I frame;
Step S5, utilizes Control Word to carry out scrambling processing to I frame;
Step S6, circulation step S2 to S5 processes a plurality of I frames.
6. for detection of a Detection and Extraction method of extracting watermark, it is characterized in that, for detection of the watermark in the data flow based on MPEG2 standard of extracting after insertion method as claimed in claim 5 is processed;
Step Q1: the grammer to the data flow based on MPEG2 standard is resolved, I frame and the Entitlement Control Message of retrieval and locator data stream;
Step Q2: process Entitlement Control Message, draw decryption key, according to decryption key, I frame is carried out to scramble process, recover the data of former I frame;
Step Q3: navigate to extending user territory and/or user data fields from the data of former I frame;
Step Q4: extract watermark information from the load of growth data territory and/or user data fields;
Step Q5: circulation step Q1 to Q4, from MPEG2 data flow, process all I frames, and extract watermark from I frame, form watermark sequence.
7. for inserting a device for watermark and Detection and Extraction watermark, it is characterized in that, comprise insertion apparatus as claimed in claim 3 and Detection and Extraction device as claimed in claim 4.
8. for inserting a method for watermark and Detection and Extraction watermark, it is characterized in that, comprise insertion method as claimed in claim 5 and Detection and Extraction method as claimed in claim 6.
9. method as claimed in claim 8, is characterized in that, the detection and location I frame in described insertion method and Detection and Extraction method, and its detailed step is:
Step SQ1: according to the syntactic structure of MPEG2 video bit stream, the data flow based on MPEG2 standard is divided into Video Sequence Layer, image sets layer, image layer from top to bottom, every one deck is provided with unique hexadecimal bit string as initial code;
Step SQ2: the initial code of retrieving images layer, the initial code of retrieving images group layer, continue first initial code of retrieving images group layer hypograph layer, second initial code that continues retrieving images layer, it is I frame data that first initial code of described image layer starts to the data between second initial code.
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Application publication date: 20140716 |