CN108257073A - A kind of invisible watermark embedding grammar and Blind extracting method - Google Patents
A kind of invisible watermark embedding grammar and Blind extracting method Download PDFInfo
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- CN108257073A CN108257073A CN201810044685.8A CN201810044685A CN108257073A CN 108257073 A CN108257073 A CN 108257073A CN 201810044685 A CN201810044685 A CN 201810044685A CN 108257073 A CN108257073 A CN 108257073A
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0052—Embedding of the watermark in the frequency domain
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0065—Extraction of an embedded watermark; Reliable detection
Abstract
The present invention provides a kind of invisible watermark embedding grammar and Blind extracting method, belongs to computer realm, which includes step 1：Original image obtains the time-domain information of pretreated original image after pretreatment；Step 2：The time-domain information of original image is converted, obtains the frequency domain information of pretreated original image；Step 3：Key random permutations are carried out to the frequency domain information of watermarking images, generate the watermarking images frequency domain information of upset；Step 4：The watermarking images frequency domain information of upset is added in the frequency domain information of pretreated original image, obtains the image frequency domain information of embedded watermark；Step 5：The image frequency domain information of embedded watermark is converted to obtain the time-domain information of the image of embedded watermark.The invention has good safety, stability, robustness, concealment, can effectively resist common de-watermarked attack.
Description
Technical field
The present invention relates to field of computer technology more particularly to a kind of invisible watermark embedding grammar and Blind extracting methods.
Background technology
Digital watermarking (Digital Watermarking) technology is that some identification informations (i.e. digital watermarking) are directly embedding
Enter in digital carrier (including multimedia, document, software etc.) or secondary indication (structure of modification specific region), and not shadow
The use value of original vector is rung, be also not easy to be ascertained and is changed again.But it can be identified and recognized by producer.Pass through these
Information in the carrier is hidden, can be reached and be confirmed creator of content, buyer, transmission secret information or whether judge carrier
The purpose of being tampered.Digital watermarking has the characteristics that safety, concealment, robustness, sensibility, is protection information safety, real
It is existing it is anti-fake trace to the source, the effective way of copyright protection, be Investigation of Information Hiding Technology field important branch and research direction.Number
Whether digital watermark can be divided into visible watermarking technique, invisible watermark technology by whether watermark is visible, needed by extraction watermark
Want original reference image that can be divided into Blind extracting digital watermark, non-Blind extracting digital watermark.
Existing digital watermark technology generally use LSB methods, Patchwork methods, based on full-scale transform domain DFT
Method, block-based dct transform method.LSB methods are to least significant bit embedding information, and LSB methods are to filtering, encoding, geometry
Transformation etc. is all very sensitive, is a kind of very fragile water mark method；Patchwork methods are a kind of are based between modification set
Certain relationship be embedded in watermark；When extracting watermark, then the information of embedded watermark is extracted according to corresponding relationship, advantage is
It can realize blind Detecting, but it can only hide the information of 1bit, and the image can only be illustrated with the presence or absence of watermark, hiding information
It measures smaller；Based on full-scale transform domain DFT method, there is good invisibility, and can effectively resist filtering, compile
Operations such as code, geometric transformation, and bulk information can be embedded in, but for cut size it is larger when, resistance is poor, and transports
Calculation amount is very big, almost unavailable for real-time video coding/decoding system；Block-based dct transform method and other transform domain sides
Method is similar to have good invisibility, and can effectively resist the operations such as filtering, coding, geometric transformation, and can be embedding
Enter bulk information, can effectively resist large scale and cut out attack, but main DCT methods are mainly become using fixed 8x8 at present
It changes, frequency domain value correction position is generally fixed, it is impossible to resist some statistical attack means.
Invention content
In view of the above problems, a kind of invisible watermark embedding grammar provided by the invention and Blind extracting method, with
Solve the deficiency of digital watermark technology in the prior art.
To achieve the above object, the technical solution taken of the present invention is：
Invisible watermark embedding grammar provided by the invention, including
Step 1：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 2：The time-domain information of original image is converted, obtains the frequency domain information of pretreated original image；
Step 3：Key random permutations are carried out to the frequency domain information of watermarking images, generate the watermarking images frequency domain letter of upset
Breath；
Step 4：The watermarking images frequency domain information of upset is added in the frequency domain information of pretreated original image,
Obtain the image frequency domain information of embedded watermark；
Step 5：The image frequency domain information of embedded watermark is converted to obtain the time-domain information of the image of embedded watermark.
Invisible watermark embedding grammar provided by the invention, it is preferable that be transformed to DCT changes in step 1 to step 5
It changes.
The Blind extracting method of invisible watermark provided by the invention, for above-mentioned invisible watermark embedding grammar insertion
Watermark extract, including：
Step 1：The frequency domain that the time-domain information of the image of embedded watermark is converted to obtain the image of embedded watermark is believed
Breath；
Step 2：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 3：The time-domain information of original image is converted, obtains the frequency domain information of pretreated original image；
Step 4：The water of upset is calculated by the frequency domain information of image and the frequency domain information of original image of embedded watermark
The frequency domain information of watermark image；
Step 5：The frequency domain information of the watermarking images of upset and Key are subjected to inversely processing, obtain the frequency domain letter of watermarking images
Breath.
The Blind extracting method of invisible watermark provided by the invention, it is preferable that be transformed to DCT in step 1 to step 5
Transformation.
Above-mentioned technical proposal has the following advantages that or advantageous effect：
Invisible watermark embedding grammar provided by the invention and Blind extracting method have good safety, stability, Shandong
Stick, concealment can effectively resist common de-watermarked attack.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent.Attached drawing is not drawn to scale deliberately, it is preferred that emphasis is the purport of the present invention is shown.
Fig. 1 is the flow chart for the invisible watermark embedding grammar that the embodiment of the present invention 1 provides；
Fig. 2 is the flow chart of the Blind extracting method for the invisible watermark that the embodiment of the present invention 1 provides.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as the limit of the present invention
It is fixed, those of ordinary skill in the art according to the equivalent transformation in these embodiment institute work energy, methods either structure or
Substitute, all belong to the scope of protection of the present invention within.
Embodiment 1：
As shown in Figure 1, invisible watermark embedding grammar provided by the invention, including
Step 1 101：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 2 102：The time-domain information of original image is converted, obtains the frequency domain letter of pretreated original image
Breath；
Step 3 103：Key random permutations are carried out to the frequency domain information of watermarking images, generate the watermarking images frequency domain of upset
Information；
Step 4 104：The watermarking images frequency domain information of upset is added to the frequency domain information of pretreated original image
In, obtain the image frequency domain information of embedded watermark；
Step 5 105：The time domain that the image frequency domain information of embedded watermark is converted to obtain the image of embedded watermark is believed
Breath.
By the frequency domain information of the time-domain information conversion original image of original image, it is placed in the frequency domain information of original image
The watermarking images information of upset so that the invisible watermark embedding grammar has good concealment, robustness, for going to remove water
(rotation is put down for print attack (A/D conversions, D/A conversions, filtering, denoising, histogram modification, quantization, compressed encoding etc.), geometric attack
Shifting, cutting, deletes row or column etc. at size change over), repeat the methods of embedded attack, collusion attack there is good resistance, increase
The safety of watermark.
More specifically, it is transformed to dct transform in step 1 to step 5.
Using dct transform mainly with transform size is variable, transform method is more, DCT frequency domains point modification coefficient changes at random
The features such as so that invisible watermark embedding grammar provided by the invention can preferably keep out de-watermarked attack (statistics, confederate etc.
De-watermarked attack), there is sufficiently strong safety, stability.
It should be noted that step three 103 and step 1 101, the sequence of step 2 102 in the present invention can be according to realities
Border is exchanged, and can also be carried out at the same time.
As shown in Fig. 2, the Blind extracting method of invisible watermark provided by the invention, for providing the embodiment of the present invention 1
Invisible watermark embedding grammar insertion watermark extract, including：
Step 1 201：The time-domain information of the image of embedded watermark is converted to obtain the frequency domain of the image of embedded watermark
Information；
Step 2 202：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 3 203：The time-domain information of original image is converted, obtains the frequency domain letter of pretreated original image
Breath；
Step 4 204：Upset is calculated by the frequency domain information of image and the frequency domain information of original image of embedded watermark
Watermarking images frequency domain information；
Step 5 205：The frequency domain information of the watermarking images of upset and Key are subjected to inversely processing, obtain the frequency of watermarking images
Domain information.
More specifically, it is transformed to dct transform in step 1 to step 5.
It should be noted that step one 201 and step 2 202, the sequence of step 3 203 in the present invention can be according to realities
Border is exchanged, and can also be carried out at the same time.
It should be appreciated by those skilled in the art that those skilled in the art combine the prior art and above-described embodiment can be real
The existing change case, it will not be described here.Such change case does not affect the essence of the present invention, and it will not be described here.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this field
It applies；Any those skilled in the art, do not depart from technical solution of the present invention make many possible changes and modifications or
The equivalent embodiment of equivalent variations is revised as, this is not affected the essence of the present invention.Therefore, it is every without departing from skill of the present invention
The content of art scheme, any simple modification made to the above embodiment of technical spirit according to the present invention, equivalent variations and is repaiied
Decorations, still fall within technical solution of the present invention protection in the range of.
Claims (4)
1. a kind of invisible watermark embedding grammar, which is characterized in that including
Step 1：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 2：The time-domain information of original image is converted, obtains the frequency domain information of pretreated original image；
Step 3：Key random permutations are carried out to the frequency domain information of watermarking images, generate the watermarking images frequency domain information of upset；
Step 4：The watermarking images frequency domain information of upset is added in the frequency domain information of pretreated original image, is obtained
The image frequency domain information of embedded watermark；
Step 5：The image frequency domain information of embedded watermark is converted to obtain the time-domain information of the image of embedded watermark.
2. invisible watermark embedding grammar as described in claim 1, which is characterized in that the transformation in step 1 to step 5 is equal
For dct transform.
3. a kind of Blind extracting method of invisible watermark, for invisible described in any one in claim 1~2 to utilizing
The watermark of watermark embedding method insertion extracts, which is characterized in that including：
Step 1：The time-domain information of the image of embedded watermark is converted to obtain the frequency domain information of the image of embedded watermark；
Step 2：Original image obtains the time-domain information of pretreated original image after pretreatment；
Step 3：The time-domain information of original image is converted, obtains the frequency domain information of pretreated original image；
Step 4：The watermark figure of upset is calculated by the frequency domain information of image and the frequency domain information of original image of embedded watermark
The frequency domain information of picture；
Step 5：The frequency domain information of the watermarking images of upset and Key are subjected to inversely processing, obtain the frequency domain information of watermarking images.
4. the Blind extracting method of invisible watermark as claimed in claim 3, which is characterized in that the change in step 1 to step 5
It is changed to dct transform.
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| CN111737662A (en) * | 2020-06-16 | 2020-10-02 | 北京达佳互联信息技术有限公司 | Watermark adding method, watermark extracting method, watermark adding device, watermark extracting device and electronic equipment |
| CN114245053A (en) * | 2021-12-10 | 2022-03-25 | 天津洪恩完美未来教育科技有限公司 | Video watermark generation method and device |
| CN115426537B (en) * | 2022-09-05 | 2023-10-13 | 上海赛连信息科技有限公司 | Method and system for adding invisible watermark and tracing information in video picture |
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Effective date of registration: 20181102 Address after: 100080 17 1701-07 unit, 2 East 3rd Street, Haidian, Haidian District, Beijing. Applicant after: Beijing Dexin orient Network Technology Co.,Ltd. Address before: 100080 801-01 8, No. 2 East Third Street, Haidian, Haidian District, Beijing. Applicant before: BEIJING NEW ORIENTAL XUNCHENG NETWORK TECHNOLOGY CO.,LTD. |
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Application publication date: 20180706 |