CN107391976A - A kind of document protection method and apparatus based on ambient noise and vector watermark - Google Patents
A kind of document protection method and apparatus based on ambient noise and vector watermark Download PDFInfo
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- CN107391976A CN107391976A CN201710711291.9A CN201710711291A CN107391976A CN 107391976 A CN107391976 A CN 107391976A CN 201710711291 A CN201710711291 A CN 201710711291A CN 107391976 A CN107391976 A CN 107391976A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/16—Program or content traceability, e.g. by watermarking
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- 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
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Abstract
The invention discloses a kind of document protection method and apparatus based on ambient noise and vector watermark, comprise the following steps：The plaintext watermark content of the document is converted to by vector data according to system coding rule；The vector data is generated into vector watermark using image processing techniques；The ambient noise of the document is generated using image processing techniques；The ambient noise and vector watermark are overlapped and generate new ambient noise；The new ambient noise is added on document background and shown.By this programme, ambient noise is added, vector watermark is hidden more thoroughly, naked eyes None- identified watermark vestige；Due to adding ambient noise, eliminate watermark more difficult, noise spot is too many, simple and effective can not thoroughly eliminate.
Description
Technical field
The present invention relates to computer safety field, and in particular to a kind of document protection based on ambient noise and vector watermark
Method and apparatus.
Background technology
Existing rank document watermark mainly divides three major types：Common plaintext watermark, the digital watermarking of pictures/images class document and vector
Watermark.
1) common plaintext watermark
Watermark content is attached to document background in the form of plaintext, watermark content is directly presented in plain text, without specially carrying
Take.
2) digital watermarking of pictures/images class document
It is embedded into by image processing techniques in the Background From Layer of pictures/images class document, passes through the image procossing of specialty
Software can extract watermark information.
3) vector watermark
Drawn by image processing techniques on document background and be superimposed some simple images (such as dot matrix sequence, lines), needed
Watermark information can just be extracted by combining image processing techniques on the basis of dot matrix and lines distribution implication is understood.
A kind of common digital watermark such as Fig. 1 in the prior art：
1) document is opened；
2) vector data is generated to plaintext watermark encoder；
3) vector watermark is generated by image processing techniques；
4) by vector watermark superposition to document background, and show on the display device.
Digital watermark of the prior art is primarily present following advantage and disadvantage：
Plaintext watermark：Advantage is to realize simply, and shortcoming is too directly perceived, and user can pass through simple amateur means and eliminate
Watermark.
Digital watermarking：Advantage is that watermark content enriches (can be picture), and shortcoming is poor robustness, by the compression of image
Deng watermark after processing can distortion, while do not have universality to common language document.
Vector watermark：Advantage is that watermark is hidden, and shortcoming is to hide not thoroughly, and watermark vestige is visible, and user still can lead to
Cross amateur means and eliminate watermark.
Halfway problem is hidden for vector watermark, the present invention proposes a kind of vector watermark based on superposition ambient noise
Technology, watermark is hidden more thoroughly, be not easy to be eliminated by user.The watermark processing of word or file can be generally applicable to.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of document protection side based on ambient noise and vector watermark
Method, comprise the following steps：
1) the plaintext watermark content of the document is converted to by vector data according to system coding rule；
2) vector data is generated into vector watermark using image processing techniques；
3) ambient noise of the document is generated using image processing techniques；
4) ambient noise and vector watermark are overlapped and generate new ambient noise；
5) the new ambient noise is added on document background and shown.
According to an embodiment of the invention, it is preferred that according to system coding rule by the bright of the document in the step 1)
Wenshui print Content Transformation refers specifically to for vector data：The plaintext watermark is converted into binary digit according to coding rule.
According to an embodiment of the invention, it is preferred that a kind of suitable image noise model of selection in the step 3), regulation
Ambient noise parameter, generate ambient noise so that the ambient noise of generation does not influence to check document.
According to an embodiment of the invention, it is preferred that the new ambient noise of generation in the step 4), make the vector water
Print is hidden into ambient noise completely, human eye None- identified watermark vestige.
According to an embodiment of the invention, it is preferred that the step of this method also includes proposing vector watermark：
6) to the file photographing of display, document picture is generated；
7) ambient noise in document picture is eliminated using image processing techniques；
8) using image processing techniques extraction vector watermark；
9) the vector watermark to extraction carries out decoding acquisition plaintext watermark content.
In order to solve the above technical problems, filled the invention provides a kind of based on ambient noise and the document protection of vector watermark
Put, including：
Vector data generation module, the plaintext watermark content of the document is converted to by binary system according to system coding rule
Numeral, generate vector data；
Vector watermark generation module, the vector data is generated into vector watermark using image processing techniques；
Ambient noise generation module, the ambient noise of the document is generated using image processing techniques；
Vector watermark superposition module, the ambient noise and vector watermark are overlapped and generate new ambient noise；
Document display module, the new ambient noise is added on document background and shown.
According to an embodiment of the invention, it is preferred that ambient noise generation module, select a kind of suitable picture noise mould
Type, ambient noise parameter is adjusted, generate ambient noise so that the ambient noise of generation does not influence to check document.
According to an embodiment of the invention, it is preferred that the vector watermark superposition module, the new ambient noise of generation, make
Vector watermark is hidden into ambient noise completely, human eye None- identified watermark vestige.
According to an embodiment of the invention, it is preferred that the device also includes：
Photo module, to the file photographing of display, generate document picture；
Ambient noise cancellation module, the ambient noise in document picture is eliminated using image processing techniques；
Vector watermark extracting module, vector watermark is extracted using image processing techniques；
Plaintext watermark acquisition module, the vector watermark to extraction carry out decoding acquisition plaintext watermark content.
In order to solve the above technical problems, the invention provides a kind of computer-readable storage medium, it includes computer program
Instruction, by performing the computer program instructions, the method for realizing one of the claims.
Following technique effect is achieved by technical scheme：
(1) ambient noise is added, vector watermark is hidden more thoroughly, naked eyes None- identified watermark vestige；
(2) ambient noise is added, eliminates watermark more difficult, noise spot is too many, simple and effective can not thoroughly eliminate；
Brief description of the drawings
Fig. 1 is watermark product process figure of the prior art
Fig. 2 is watermark product process figure of the present invention
Fig. 3 is watermark extracting flow chart of the present invention
Fig. 4 uses the flow chart of document protection embodiment 1 of the present invention program
Fig. 5 uses the flow chart of document protection embodiment 2 of the present invention program
Embodiment
<Document protection method>
The invention discloses a kind of document protection method based on ambient noise and vector watermark, comprise the following steps：
1) the plaintext watermark content of the document is converted to by vector data according to system coding rule；
2) vector data is generated into vector watermark using image processing techniques；
3) ambient noise of the document is generated using image processing techniques；
4) ambient noise and vector watermark are overlapped and generate new ambient noise；
5) the new ambient noise is added on document background and shown.
The plaintext watermark content of the document is converted to by vector data tool according to system coding rule in the step 1)
Body refers to：The plaintext watermark is converted into binary digit according to coding rule.
A kind of suitable image noise model of selection in the step 3), adjusts ambient noise parameter, generates ambient noise,
So that the ambient noise of generation does not influence to check document.
The new ambient noise of generation, makes the vector watermark be hidden into completely in ambient noise, people in the step 4)
Eye None- identified watermark vestige.
The step of this method also includes proposing vector watermark：
6) to the file photographing of display, document picture is generated；
7) ambient noise in document picture is eliminated using image processing techniques；
8) using image processing techniques extraction vector watermark；
9) the vector watermark to extraction carries out decoding acquisition plaintext watermark content.
With reference to Fig. 1, generation and extraction process to vector watermark are described.
Watermark product process：
(1) when document is opened, plaintext watermark content is first converted to by vector data according to system coding rule.
Coding rule：The character string of plaintext is exactly converted into binary digit according to coding rule, can direct basis
The numerical value conversion of ascii codes, it can also be needed to carry out ascii codes the mask conversion of oneself according to enterprise.
(2) vector watermark is generated according to vector data using image processing techniques.
Embodiment can be that vector data is converted into image vector dot matrix/lines (such as according to coding：0-255
Numeral correspond to different dot matrix images or different line lengths).
(3) certain ambient noise is generated using image processing techniques, granularity, the amplitude of noise can be according to actual need
To adjust within the specific limits.
Such as one by the conventional images noise model such as salt-pepper noise, poisson noise, speckle noise, white Gaussian noise
Kind, generate certain noise pattern point, and vector dot matrix/lines superposition of the vector watermark above generated.
Picture noise has different types, and each type of noise intensity and effect have different parameters, when actually realizing
Select a kind of optimal noise type of effect and parameter.Image noise model can be selected from：Salt-pepper noise, poisson noise, spot
One kind of the conventional images noise model such as spot noise, white Gaussian noise, while adjust noise parameter, make noise as background not shadow
Ring the reading to document content.
(4) ambient noise of generation and vector watermark are overlapped, vector watermark is hidden into ambient noise completely
In, pass through naked eyes None- identified watermark vestige.
Wherein, a kind of mode of superposition can be：The watermark vector dot matrix/lines spread out are first drawn in blank drawing, then
The image procossing storehouse of specialty or instrument drafting noise dot matrix is being used above.
(5) ambient noise after superposition is shown on display device as document background.So in document print, cut
Shield, take pictures etc. when obtaining document content, there is the picture noise of hiding vector watermark in document content background.Noise content is disperseed,
Watermark vestige can not be observed directly, user can not eliminate.
Watermark extracting flow：
(1) portion there is into the picture of vector watermark and ambient noise (picture is probably the taking pictures of paper document, electronics
Electronic document takes pictures on the screenshotss of device power subdocument, electronic equipment) import system.
(2) picture background noise is eliminated using image processing techniques.
Embodiment can remove noise (such as medium filtering, gaussian filtering) by some Image filter arithmetics.
(3) using image processing techniques extraction vector watermark.
Above-mentioned image processing techniques, image characteristics extraction and Edge Detection can be used.
(4) the vector watermark to extraction carries out decoding acquisition plaintext watermark content.
Coding and decoding is the process of contrary.The Details Methods such as some templates (feature) matching can also be combined and improve identification
Degree, watermark is generated according to watermark generation method, and target image carries out the matching of image phase knowledge and magnanimity.
<Document protection device>
The invention discloses a kind of document protection device based on ambient noise and vector watermark, including：
Vector data generation module, the plaintext watermark content of the document is converted to by binary system according to system coding rule
Numeral, generate vector data；
Vector watermark generation module, the vector data is generated into vector watermark using image processing techniques；
Ambient noise generation module, the ambient noise of the document is generated using image processing techniques；
Vector watermark superposition module, the ambient noise and vector watermark are overlapped and generate new ambient noise；
Document display module, the new ambient noise is added on document background and shown.
Wherein, ambient noise generation module, a kind of suitable image noise model is selected, adjusts ambient noise parameter, it is raw
Into ambient noise so that the ambient noise of generation does not influence to check document.
Wherein, the vector watermark superposition module, the new ambient noise of generation, makes vector watermark be hidden into background completely
In noise, human eye None- identified watermark vestige.
The device also includes：
Photo module, to the file photographing of display, generate document picture；
Ambient noise cancellation module, the ambient noise in document picture is eliminated using image processing techniques；
Vector watermark extracting module, vector watermark is extracted using image processing techniques；
Plaintext watermark acquisition module, the vector watermark to extraction carry out decoding acquisition plaintext watermark content.
<Specific embodiment>
Such as Fig. 4, the invention discloses a kind of embodiment of screen shot protection, the embodiment comprises the following steps：
(1) document is opened.
(2) plaintext watermark content is first converted to by vector data according to system coding rule.
Coding rule：The character string of plaintext is exactly converted into binary digit according to coding rule, can direct basis
The numerical value conversion of ascii codes, it can also be needed to carry out ascii codes the mask conversion of oneself according to enterprise.
(3) vector watermark is generated according to vector data using image processing techniques.
(4) certain ambient noise is generated using image processing techniques.
Picture noise has different types, and each type of noise intensity and effect have different parameters, when actually realizing
Select a kind of optimal noise type of effect and parameter.Image noise model can be selected from：Salt-pepper noise, poisson noise, spot
One kind of the conventional images noise model such as spot noise, white Gaussian noise, while adjust noise parameter, make noise as background not shadow
Ring the reading to document content.
(5) ambient noise of generation and vector watermark are overlapped.
(6) ambient noise after superposition is shown on display device as document background.
Display device can be common LCD display, either general display devices or touch-control of mobile phone or intelligent terminal
Display device etc., is not limited herein.
(7) screen shot, ambient noise and hiding vector watermark are included in the picture for generation of taking pictures.
Camera, video camera or mobile phone with camera function by specialty etc. are taken pictures to display device.
(8) will take pictures picture import system.
The photo of shooting or picture are imported into watermark extracting system.
(9) picture background noise is eliminated using image processing techniques.
Various common image processing techniques can be used, the known skill of this area is belonged to due to eliminating picture background noise
Art, do not limit herein.
(10) using image processing techniques extraction vector watermark.
The vector watermark of (11) to extraction carries out decoding and obtains plaintext watermark content.
Decode to obtain plaintext watermark content by converting plaintext into the opposite process of vector data by vector watermark.
Such as Fig. 5, the invention discloses a kind of embodiment of document print protection, the embodiment comprises the following steps：
(1) document is opened, and is printed.
(2) monitoring system print out task, the print out task of watermark control in need is monitored.
(3) plaintext watermark content is first converted to by vector data according to system coding rule.
Coding rule：The character string of plaintext is exactly converted into binary digit according to coding rule, can direct basis
The numerical value conversion of ascii codes, it can also be needed to carry out ascii codes the mask conversion of oneself according to enterprise.
(4) vector watermark is generated according to vector data using image processing techniques.
(5) certain ambient noise is generated using image processing techniques.
(6) ambient noise of generation and vector watermark are overlapped.
(7) ambient noise after superposition is shown on display device as document background.
(8) paper after printing is taken pictures, and ambient noise and hiding vector watermark are included in the picture for generation of taking pictures.
(9) will take pictures picture import system.
(10) picture background noise is eliminated using image processing techniques.
(11) using image processing techniques extraction vector watermark.
The vector watermark of (12) to extraction carries out decoding and obtains plaintext watermark content.
By adding ambient noise, vector watermark is set to hide more thoroughly, naked eyes None- identified watermark vestige；Carried on the back due to adding
Scape noise, eliminate watermark more difficult, noise spot is too many, simple and effective can not thoroughly eliminate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement for being made etc., the guarantor in the present invention all should be protected
Within the scope of shield.
Claims (10)
1. a kind of document protection method based on ambient noise and vector watermark, comprises the following steps：
1) the plaintext watermark content of the document is converted to by vector data according to system coding rule；
2) vector data is generated into vector watermark using image processing techniques；
3) ambient noise of the document is generated using image processing techniques；
4) ambient noise and vector watermark are overlapped and generate new ambient noise；
5) the new ambient noise is added on document background and shown.
2. according to the method for claim 1, in the step 1) according to system coding rule by the plaintext water of the document
Print Content Transformation refers specifically to for vector data：The plaintext watermark is converted into binary digit according to coding rule.
3. a kind of according to the method for claim 1, suitable image noise model of selection in the step 3), adjusts background
Noise parameter, generate ambient noise so that the ambient noise of generation does not influence to check document.
4. the new ambient noise according to the method for claim 1, generated in the step 4), makes the vector watermark complete
It is hidden into entirely in ambient noise, human eye None- identified watermark vestige.
5. according to the method described in one of claim 1-4, this method is also including the step of proposing vector watermark：
6) to the file photographing of display, document picture is generated；
7) ambient noise in document picture is eliminated using image processing techniques；
8) using image processing techniques extraction vector watermark；
9) the vector watermark to extraction carries out decoding acquisition plaintext watermark content.
6. a kind of document protection device based on ambient noise and vector watermark, including：
Vector data generation module, the plaintext watermark content of the document is converted to by binary number according to system coding rule
Word, generate vector data；
Vector watermark generation module, the vector data is generated into vector watermark using image processing techniques；
Ambient noise generation module, the ambient noise of the document is generated using image processing techniques；
Vector watermark superposition module, the ambient noise and vector watermark are overlapped and generate new ambient noise；
Document display module, the new ambient noise is added on document background and shown.
7. device according to claim 6, ambient noise generation module, selecting a kind of suitable image noise model, adjust
Ambient noise parameter is saved, generates ambient noise so that the ambient noise of generation does not influence to check document.
8. device according to claim 6, the vector watermark superposition module, the new ambient noise of generation, make vector
Watermark is hidden into ambient noise completely, human eye None- identified watermark vestige.
9. according to the device described in one of claim 6-8, the device also includes：
Photo module, to the file photographing of display, generate document picture；
Ambient noise cancellation module, the ambient noise in document picture is eliminated using image processing techniques；
Vector watermark extracting module, vector watermark is extracted using image processing techniques；
Plaintext watermark acquisition module, the vector watermark to extraction carry out decoding acquisition plaintext watermark content.
10. a kind of computer-readable storage medium, it includes computer program instructions, by performing the computer program instructions,
The method for realizing one of claim 1-5.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108174051A (en) * | 2017-12-08 | 2018-06-15 | 新华三技术有限公司 | A kind of vector watermark decoding method, device and electronic equipment |
| CN109543152A (en) * | 2018-11-06 | 2019-03-29 | 北京指掌易科技有限公司 | A kind of dark watermark display methods in mobile terminal |
| CN110675304A (en) * | 2018-07-03 | 2020-01-10 | 山东华软金盾软件股份有限公司 | Picture watermark encoding method |
| CN113095987A (en) * | 2021-03-26 | 2021-07-09 | 贵州大学 | Robust watermarking method of diffusion weighted image based on multi-scale feature learning |
| CN114564705A (en) * | 2022-04-29 | 2022-05-31 | 杭州安司源科技有限公司 | Traceable anti-shooting method and device and storage medium |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108174051A (en) * | 2017-12-08 | 2018-06-15 | 新华三技术有限公司 | A kind of vector watermark decoding method, device and electronic equipment |
| CN110675304A (en) * | 2018-07-03 | 2020-01-10 | 山东华软金盾软件股份有限公司 | Picture watermark encoding method |
| CN109543152A (en) * | 2018-11-06 | 2019-03-29 | 北京指掌易科技有限公司 | A kind of dark watermark display methods in mobile terminal |
| CN113095987A (en) * | 2021-03-26 | 2021-07-09 | 贵州大学 | Robust watermarking method of diffusion weighted image based on multi-scale feature learning |
| CN113095987B (en) * | 2021-03-26 | 2022-02-01 | 贵州大学 | Robust watermarking method of diffusion weighted image based on multi-scale feature learning |
| CN114564705A (en) * | 2022-04-29 | 2022-05-31 | 杭州安司源科技有限公司 | Traceable anti-shooting method and device and storage medium |
| CN114564705B (en) * | 2022-04-29 | 2022-08-05 | 杭州安司源科技有限公司 | Traceable anti-shooting method and device and storage medium |
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Application publication date: 20171124 |