CN103413267B - Embedding grammar that a kind of digital watermarking seamlessly transits and device - Google Patents
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Abstract
The present invention relates to the technical field of copyright authentication, particularly relate to embedding grammar and device that a kind of digital watermarking seamlessly transits, the Pixel Information original including extracting pending works, described Pixel Information includes the position data that pixel data is corresponding with pixel data；According to described position data, watermark value to be embedded is carried out quadratic function transform operation；Being overlapped through the watermark value result of calculation to be embedded of quadratic function transform operation and the original pixel data of correspondence position.Watermark value to be embedded, after quadratic function converts, becomes a variable with parabolic characteristic.By selecting watermark region to be embedded, after allowing embedding change, at the pixel data blocks regional center of watermark value, superposition watermark value is maximum, diminish gently from the center to edge superposition watermark value, edge's superposition watermark value is minimum, i.e. mild with the change transition of the color of surrounding pixel data, reduce the watermark visual impact to human eye, make embedding watermark have relatively low human eye identification degree.
Description
Technical field
The present invention relates to the technical field of copyright authentication, be specifically related to digital watermark technology, particularly relate to one
Embedding grammar that digital watermarking seamlessly transits and device.
Background technology
Along with the fast development of multimedia technology, the protection of digital product copyright is increasingly subject to people's attention,
Video, image digital watermark have become as Digital Watermarking Theory research and the emphasis of actual application.Multimedia number
Word watermark (Digital Watermarking) technology is by the most embedding to some identification informations, i.e. digital watermarking
Enter digital carrier, in video, image, the most do not affect the use value of original vector, be also not easy by people
Visual system perceive or note.Hide information in the carrier by these, can reach to confirm content wound
The person of building or the purpose of the pirate delinquent of buyer, transmission secret information or judgement.
The digital watermarking algorithm relating to video or image at present is roughly divided into two classes, and a class is blind watermarking algorithm,
Another kind of is non-blind watermarking algorithm, blind watermarking algorithm i.e. watermark embed and extract time need not original video or
Image pixel data, rather than blind watermarking algorithm needs original video or image pixel when watermark embeds and extracts
Data.General non-blind watermarking algorithm is plus-minus definite value on raw pixel data block, i.e. original video,
On the basis of the pixel data of image, adding or deduct a fixed value, this fixed value is the digital water of embedding
Print, to reach the purpose of digital watermark embedding, when needs extract this digital watermarking, as long as using its inverse fortune
Calculate.But, this algorithm can directly result in embed digital watermarking pixel data blocks region with about
There is color gradient in the color change of pixel data, it is impossible to enough visually formation seamlessly transits, thus affects
Visual effect.
Summary of the invention
It is an object of the invention to propose embedding grammar and the device that a kind of digital watermarking seamlessly transits, it is possible to make
Have been inserted into the original video of watermark, the pixel data blocks region of image changed with the color of surrounding pixel data
Cross mild, while keeping watermark robustness constant, reduce the watermark visual impact to human eye, make embedding water
Print has relatively low human eye identification degree.
For reaching this purpose, the present invention by the following technical solutions:
First aspect, it is provided that the embedding grammar that a kind of digital watermarking seamlessly transits, including:
Extracting the Pixel Information that pending works are original, wherein, described Pixel Information includes pixel data and picture
Prime number is according to corresponding position data；
According to described position data, watermark value to be embedded is carried out quadratic function transform operation；
Through the watermark value result of calculation to be embedded of quadratic function transform operation and the original picture of correspondence position
Prime number is according to being overlapped.
Wherein, described quadratic function transform operation is for carry out transform operation or root according to the progressive quadratic function of cosine
Transform operation is carried out according to Gauss weight quadratic function.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
a(i,j)×t={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, a (i, j) is watermark amplitude,
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.
Wherein, described the watermark value result of calculation to be embedded through quadratic function transform operation and correspondence position
Original pixel data be overlapped particularly as follows:
pw(i,j)=p(i,j)+a(i,j)×t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
Second aspect, it is provided that the flush mounting that a kind of digital watermarking seamlessly transits, including:
Extraction element: for extracting the Pixel Information that pending works are original, wherein, described Pixel Information bag
Include the position data that pixel data is corresponding with pixel data；
Converting means: for watermark value to be embedded being carried out quadratic function transform operation according to described position data；
Stacking apparatus: for through the watermark value result of calculation to be embedded of quadratic function transform operation and correspondence
The original pixel data of position is overlapped.
Wherein, described quadratic function transform operation is for carry out transform operation or root according to the progressive quadratic function of cosine
Transform operation is carried out according to Gauss weight quadratic function.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
a(i,j)×t={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, a (i, j) is watermark amplitude,
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.
Wherein, described the watermark value result of calculation to be embedded through quadratic function transform operation and correspondence position
Original pixel data be overlapped particularly as follows:
pw(i,j)=p(i,j)+a(i,j)×t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
The beneficial effects of the present invention is: embedding grammar that a kind of digital watermarking seamlessly transits and device, extract
The Pixel Information that pending works are original, wherein, described Pixel Information includes pixel data and pixel data pair
The position data answered；According to described position data, watermark value to be embedded is carried out quadratic function transform operation；?
Watermark value result of calculation to be embedded and the original pixel data of correspondence position through quadratic function transform operation
It is overlapped.Watermark value to be embedded is a fixed value, after quadratic function converts, becomes one and has throwing
The variable of thing line characteristic.Parabola is zhou duicheng tuxing, has a variable summit in center, from variable summit
Increasingly milder along parabolic curve tendency variable-value variation tendency, in edge, variable-value change becomes
Gesture is the mildest, by selecting watermark region to be embedded, and the pixel data blocks region of watermark value after allowing embedding change
Superposition watermark value in center is maximum, diminishes gently from the center to edge superposition watermark value, edge's superposition watermark
Value minimum, i.e. changes transition with the color of surrounding pixel data mild, is keeping constant same of watermark robustness
Time reduce the watermark visual impact to human eye, make embedding watermark have relatively low human eye identification degree.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, the embodiment of the present invention will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
Under premise, it is also possible to content according to embodiments of the present invention and these accompanying drawings obtain other accompanying drawing.
Fig. 1 is the embedding grammar flow chart that a kind of digital watermarking that the embodiment of the present invention 1 provides seamlessly transits；
Fig. 2 be the embodiment of the present invention 2 provide choose 16 × 16 pixel data blocks, according to the progressive secondary of cosine
Function carries out the watermark amplitude power schematic diagram of transform operation；
Fig. 3 be the embodiment of the present invention 2 provide in 16 × 16 pixel data blocks, according to cosine progressive two
Secondary function carry out transform operation after the superposition that is superimposed upon in raw pixel data of watermark value before and after video interception pair
Compare schematic diagram；
Fig. 4 be the embodiment of the present invention 3 provide choose 8 × 8 pixel data blocks, according to Gauss weight secondary letter
Number carries out the watermark amplitude power schematic diagram of transform operation；
Fig. 5 be the embodiment of the present invention 3 provide in 8 × 8 pixel data blocks, according to Gauss weight secondary
Function carry out transform operation after the superposition that is superimposed upon in raw pixel data of watermark value before and after video interception contrast
Schematic diagram；
Fig. 6 is the flush mounting principle signal that a kind of digital watermarking that the embodiment of the present invention 4 provides seamlessly transits
Figure.
Detailed description of the invention
Technical scheme and the technique effect reached for making to present invention solves the technical problem that, using are clearer,
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in further detail, it is clear that retouched
The embodiment stated is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, the every other reality that those skilled in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, the embedding grammar that seamlessly transits of a kind of digital watermarking provided for the embodiment of the present invention 1
Flow chart.
The embedding grammar that this digital watermarking seamlessly transits, comprises the steps:
S101, extracting the Pixel Information that pending works are original, wherein, described Pixel Information includes pixel count
According to the position data corresponding with pixel data；
Pixel data both can be rgb value, it is also possible to for YUV value.
Rgb color pattern is a kind of color standard of industrial quarters, is by red (R), green (G), blue (B) three
The change of individual Color Channel and their superpositions each other obtain color miscellaneous, and RGB is i.e.
Represent the color of three passages of red, green, blue, this standard almost include human eyesight can the institute of perception
There is color, be to use one of the widest color system at present.
A kind of colour coding method (belonging to PAL-system) that YUV pattern is used by eurovision system, be
The color space that PAL and SECAM simulation color television system uses.In modern color television system, generally
Three pipe colour cameras or colored CCD camera is used to carry out capture, then the colour picture signal obtained
After color separation, respectively amplification correction, obtain RGB, then obtain luminance signal Y and two through matrixer
Colour difference signal R-Y(i.e. U), B-Y(i.e. V), brightness and three signals of aberration are entered by last transmitting terminal respectively
Row coding, sends with same channel.The method for expressing of this color is exactly so-called YUV color space
Represent.Use the importance of YUV color space to be its luminance signal Y and carrier chrominance signal U, V are to separate.
S102, according to described position data, watermark value to be embedded is carried out quadratic function transform operation；
Watermark value to be embedded can automatically generate according to username and password, it is also possible to based on network authorization certificate
Generate, it is also possible to rely on the biological characteristic of human body according to biological identification technology, as fingerprint generates.Ordinary circumstance
Under, the intensity of digital watermarking is set to a fixed value.
General non-blind watermarking algorithm is one fixed value of plus-minus in the pixel data blocks of n × n size, and reaches
Purpose to digital watermark embedding.I.e. select and treat the pixel data blocks region that water mark inlaying is n × n size, former
Beginning video, image pixel data on the basis of, add or deduct a fixed value, reach digital watermark embedding
Purpose, when needs extract this digital watermarking, as long as using its inverse operation.
Quadratic function is parabola, and parabola image is zhou duicheng tuxing.Quadratic function has one in center
Unique variable summit, more and more flat along parabolic curve tendency variable-value variation tendency from variable summit
Slow, the mildest in edge's variable-value variation tendency,
S103, former through the watermark value result of calculation to be embedded of quadratic function transform operation and correspondence position
The pixel data begun is overlapped.
Result of calculation through the watermark value to be embedded of quadratic function transform operation is a parabola, at center
There is a unique variable summit at place, from variable summit along parabolic curve tendency variable-value variation tendency
Increasingly milder, the mildest in edge's variable-value variation tendency, this result of calculation and correspondence position former
The pixel data begun is overlapped, minimum in the marginal position superposition digital watermarking intensity of overlap-add region, superposition
The pixel data in region and neighbouring raw pixel data change enhancing of going forward one by one, in the center of overlap-add region
Superposition digital watermarking maximum intensity.
Watermark value to be embedded is a fixed value, after quadratic function converts, becomes one and has parabola spy
The variable of property.Parabola is zhou duicheng tuxing, has a variable summit in center, from variable summit along throwing
Thing line curve tendency variable-value variation tendency is increasingly milder, and in edge, variable-value variation tendency is the most flat
Slow, by selecting watermark region to be embedded, after allowing embedding change at the pixel data blocks regional center of watermark value
Superposition watermark value is maximum, diminishes gently from the center to edge superposition watermark value, and edge's superposition watermark value is minimum,
I.e. change transition with the color of surrounding pixel data mild, while keeping watermark robustness constant, reduce water
The print visual impact to human eye, makes embedding watermark have relatively low human eye identification degree.
Preferably, described quadratic function transform operation for according to the progressive quadratic function of cosine carry out transform operation or
Transform operation is carried out according to Gauss weight quadratic function.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
a(i,j)×t={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, (i, j) is watermark amplitude or watermark strength to a, is the important factor controlling watermark visual effect, determines
Watermark amplitude is strong and weak.
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded, for known fixed.
Above formula is derived by cosine progressive quadratic function operational formula, cosine progressive quadratic function computing
Formula is:
d(x,y)=[1-(cosx)2]×[1-(cosy)2]
The span of wherein x, y is 0～π, π is divided into n-1 equal portions, then formula is converted to:
a(i,j)={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}
Then:
a(i,j)×t={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, described the watermark value result of calculation to be embedded through quadratic function transform operation and correspondence position
Original pixel data be overlapped particularly as follows:
pw(i,j)=p(i,j)+a(i,j)×t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
As a example by n=16, calculate the amplitude through the watermark value to be embedded of cosine progressive quadratic function conversion strong and weak
A (i, j), wherein, a (i, j)={ 1-[cos ((i-1) × π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}.As in figure 2 it is shown,
Choose 16 × 16 pixel data blocks for what the embodiment of the present invention 2 provided, carry out according to the progressive quadratic function of cosine
The watermark amplitude power schematic diagram of transform operation.From this figure it can be seen that treat that the amplitude of water mark inlaying value is in pixel
Data block center intensity is the strongest, dies down gently from the center to edge strength, and edge's intensity is minimum, at edge
Position, watermark embedment strength is 0.
As it is shown on figure 3, for the embodiment of the present invention 2 provide in 16 × 16 pixel data blocks, according to remaining
The progressive quadratic function of string carry out transform operation after the superposition front-and rear-view that is superimposed upon in raw pixel data of watermark value
Frequently sectional drawing contrast schematic diagram.A figure is original video sectional drawing, and B figure is be labelled with watermark location to be superimposed original
Video interception, the white box in figure is prestacked watermark location, and C figure is the corresponding video after superposition watermark
Sectional drawing.From this figure it can be seen that watermark uses the method that the progressive quadratic function of cosine seamlessly transits so that embedding
The raw pixel data of the video pixel block edge and surrounding not water mark inlaying that enter watermark merges completely, embeds water
The pixel data blocks of print is mild with the color change transition of surrounding pixel data, thus reaches not affect vision effect
Really, the purpose that human eye identification degree is low.
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded, the value of n
Depending on pixel data block size according to watermark value to be embedded, as taken n=8 or n=32, use cosine progressive two
After secondary function smooth transient method carries out the embedding of watermark, the video pixel data block containing watermark regards with neighborhood
Frequently pixel data has reached effectively to seamlessly transit effect, and watermark has complete invisibility in edge.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.According to different application scenarios, in order to visual sense feeling is more preferably selected
Empirical value, be traditionally arranged to be a=0.2, b=4.5, c=4.
According to Superposition Formula p as abovew((i, j) (i, j) × t, as a example by n=8, calculate through too high+a for i, j)=p
This weight quadratic function conversion watermark value to be embedded amplitude power a (i, j)；
Wherein, a (i, j)=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2].As shown in Figure 4, real for the present invention
That executes example 3 offer chooses 8 × 8 pixel data blocks, carries out the water of transform operation according to Gauss weight quadratic function
Print amplitude power schematic diagram.From this figure it can be seen that treat that the amplitude of water mark inlaying value is strong at pixel data blocks center
Degree is the strongest, dies down gently from the center to edge strength, and edge's intensity is minimum.
As it is shown in figure 5, for the embodiment of the present invention 3 provide in 8 × 8 pixel data blocks, according to Gauss
Weight quadratic function carry out transform operation after the superposition that is superimposed upon in raw pixel data of watermark value before and after video
Sectional drawing contrast schematic diagram.A figure is original video sectional drawing, and B figure is to be labelled with the original of prestacked watermark location to regard
Frequently sectional drawing, the white box in figure is prestacked watermark location, and C figure is that the corresponding video after superposition watermark cuts
Figure.From this figure it can be seen that watermark uses the method that Gauss weight quadratic function seamlessly transits so that embed
The video pixel block of watermark preferably combines together with the pixel of its neighborhood, relative to directly at water to be embedded
A fixed value is increased or decreased in the video pixel data block of print, for producing color gradient, embeds watermark
The pixel data in pixel data blocks and region about seamlessly transit, reach not affect the effect of visual effect,
Reducing the visual effect that human eye is caused by watermark, human eye identification degree is low.
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded, the value of n
Depending on pixel data block size according to watermark value to be embedded, as taken n=8 or n=32, use Gauss weight two
After secondary function smooth transient method carries out the embedding of watermark, the video pixel data block containing watermark regards with neighborhood
Frequently pixel data has reached effectively to seamlessly transit effect, and watermark has good invisibility in edge.
As shown in Figure 6, the flush mounting that a kind of digital watermarking provided for the embodiment of the present invention 4 seamlessly transits
Principle schematic.
The flush mounting 10 that a kind of digital watermarking seamlessly transits, including:
Extraction element 11: for extracting the Pixel Information that pending works are original, wherein, described Pixel Information
Including the position data that pixel data is corresponding with pixel data；
Converting means 12: transport for watermark value to be embedded being carried out quadratic function conversion according to described position data
Calculate；
Stacking apparatus 13: for through the watermark value result of calculation to be embedded of quadratic function transform operation and right
The original pixel data answering position is overlapped.
Wherein, described quadratic function transform operation is for carry out transform operation or root according to the progressive quadratic function of cosine
Transform operation is carried out according to Gauss weight quadratic function.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
a(i,j)×t={1-[cos((i-1)×π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, a (i, j) is watermark amplitude,
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded.
It is wherein, described that according to described position data, watermark value to be embedded to be carried out quadratic function transform operation concrete
For:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.
Wherein, described the watermark value result of calculation to be embedded through quadratic function transform operation and correspondence position
Original pixel data be overlapped particularly as follows:
pw(i,j)=p(i,j)+a(i,j)×t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel data of watermark value to be embedded to i, j ∈
Block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
The flush mounting that a kind of digital watermarking seamlessly transits, including for extracting the pixel that pending works are original
The extraction element of information, wherein, described Pixel Information includes the positional number that pixel data is corresponding with pixel data
According to；For watermark value to be embedded being carried out according to described position data the converting means of quadratic function transform operation；
For through the watermark value result of calculation to be embedded of quadratic function transform operation and the original picture of correspondence position
Prime number is according to the stacking apparatus being overlapped.Watermark value to be embedded is a fixed value, after quadratic function converts,
Become a variable with parabolic characteristic.Parabola is zhou duicheng tuxing, has a variable top in center
Point, increasingly milder, in edge along parabolic curve tendency variable-value variation tendency from variable summit
Variable-value variation tendency is the mildest, by selecting watermark region to be embedded, and watermark value after allowing embedding change
At pixel data blocks regional center, superposition watermark value is maximum, diminishes gently from the center to edge superposition watermark value,
Edge's superposition watermark value is minimum, i.e. changes transition with the color of surrounding pixel data mild, is keeping watermark
Reducing the watermark visual impact to human eye while robustness is constant, making embedding watermark have relatively low human eye can
Resolution.
Obviously, it will be understood by those skilled in the art that each modular device and each step of the above-mentioned present invention can
To realize with general calculating device, they can concentrate on single calculating device, or is distributed in many
On the network that individual calculating device is formed, alternatively, they can use computer installation executable program generation
Code realizes, and performs such that it is able to be stored in storing in device by calculating device, or by them
It is fabricated to each integrated circuit modules respectively, or the multiple modules in them or step are fabricated to single collection
Circuit module is become to realize.So, the present invention is not restricted to the combination of any specific hardware and software.
Above content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to this
The thought of invention, the most all will change, and this specification content is not
It is interpreted as limitation of the present invention.
Claims (10)
1. the embedding grammar that a digital watermarking seamlessly transits, it is characterised in that including:
Extracting the Pixel Information that pending works are original, wherein, described Pixel Information includes pixel data and picture
Prime number is according to corresponding position data；
According to described position data, watermark value to be embedded is carried out quadratic function transform operation；
Through the watermark value result of calculation to be embedded of quadratic function transform operation and the original picture of correspondence position
Prime number is according to being overlapped.
The embedding grammar that a kind of digital watermarking the most according to claim 1 seamlessly transits, it is characterised in that
Described quadratic function transform operation is for carry out transform operation or according to Gauss weight according to the progressive quadratic function of cosine
Quadratic function carries out transform operation.
The embedding grammar that a kind of digital watermarking the most according to claim 2 seamlessly transits, it is characterised in that
Described according to described position data, watermark value to be embedded is carried out quadratic function transform operation particularly as follows:
A (i, j) × t={1-[cos ((i-1) × π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, a (i, j) is watermark amplitude,
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded.
The embedding grammar that a kind of digital watermarking the most according to claim 2 seamlessly transits, it is characterised in that
Described according to described position data, watermark value to be embedded is carried out quadratic function transform operation particularly as follows:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel count of watermark value to be embedded to i, j ∈
According to block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.
The embedding grammar that a kind of digital watermarking the most according to claim 1 seamlessly transits, it is characterised in that
Described the watermark value result of calculation to be embedded through quadratic function transform operation and the original picture of correspondence position
Prime number according to being overlapped particularly as follows:
pw(i, j)=p (i, j)+a (i, j) × t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel count of watermark value to be embedded to i, j ∈
According to block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
6. the flush mounting that a digital watermarking seamlessly transits, it is characterised in that including:
Extraction element: for extracting the Pixel Information that pending works are original, wherein, described Pixel Information bag
Include the position data that pixel data is corresponding with pixel data；
Converting means: for watermark value to be embedded being carried out quadratic function transform operation according to described position data；
Stacking apparatus: for through the watermark value result of calculation to be embedded of quadratic function transform operation and correspondence
The original pixel data of position is overlapped.
The flush mounting that a kind of digital watermarking the most according to claim 6 seamlessly transits, it is characterised in that
Described quadratic function transform operation is for carry out transform operation or according to Gauss weight according to the progressive quadratic function of cosine
Quadratic function carries out transform operation.
The flush mounting that a kind of digital watermarking the most according to claim 7 seamlessly transits, it is characterised in that
Described according to described position data, watermark value to be embedded is carried out quadratic function transform operation particularly as follows:
A (i, j) × t={1-[cos ((i-1) × π/(n-1))]2}×{1-[cos((j-1)×π/(n-1))]2}×t
Wherein, a (i, j) is watermark amplitude,
N is pixel data blocks horizontal direction or the number of pixels of vertical direction of watermark value to be embedded,
I with j is the position data that pixel data is corresponding, i, j ∈ (1, n),
T is watermark value to be embedded.
The flush mounting that a kind of digital watermarking the most according to claim 7 seamlessly transits, it is characterised in that
Described according to described position data, watermark value to be embedded is carried out quadratic function transform operation particularly as follows:
A (i, j) × t=a × e^ [-(i-b)2/2c2] × e^ [-(j-b)2/2c2]×t
Wherein, a (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel count of watermark value to be embedded to i, j ∈
According to block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded,
A, b, c are for presetting preset parameter.
The flush mounting that a kind of digital watermarking the most according to claim 6 seamlessly transits, its feature exists
Original in, described the watermark value result of calculation to be embedded through quadratic function transform operation and correspondence position
Pixel data be overlapped particularly as follows:
pw(i, j)=p (i, j)+a (i, j) × t
Wherein, pw(i, j) for the pixel data after embedding watermark,
P (i, j) is original pixel data,
A (i, j) is watermark amplitude,
I with j is the position data that pixel data is corresponding, and (1, n), n is the pixel count of watermark value to be embedded to i, j ∈
According to block horizontal direction or the number of pixels of vertical direction,
T is watermark value to be embedded.
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