CN106228503A - The digital watermark embedding of satellite remote-sensing image SHP dot file and extracting method - Google Patents
The digital watermark embedding of satellite remote-sensing image SHP dot file and extracting method Download PDFInfo
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- CN106228503A CN106228503A CN201610557405.4A CN201610557405A CN106228503A CN 106228503 A CN106228503 A CN 106228503A CN 201610557405 A CN201610557405 A CN 201610557405A CN 106228503 A CN106228503 A CN 106228503A
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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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- 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
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Abstract
The invention discloses digital watermark embedding and the extracting method of a kind of satellite remote-sensing image SHP dot file, belong to field of information security technology, the method can the satellite remote-sensing image of SHP form is carried out product quality supervision, ensure product information safely, review related responsibility while, reduce storage redundancy, and then in a small amount of space, deposit more watermark information.
Description
Technical field
The present invention relates to field of information security technology, be specifically related to the digital water of a kind of satellite remote-sensing image SHP dot file
Print embeds and extracting method.
Background technology
Satellite remote-sensing image is basic, the strategic information resource that country is important, is planning of science activities, environmental conservation, money
The important evidence of the work such as source exploitation, engineering construction, military combat, is the basic instrument of informatization and sustainable development
And important leverage.The data information security of guarantee satellite remote-sensing image is the major issue that engineers and technicians face.
Information security encryption technology is protection digital product most common method, and the development comparative maturity of this technology, at letter
The every field of breath society is widely used.Utilize encryption technology to be encrypted by file, make file content become
Ciphertext, even if so file also cannot be obtained its content by illicit interception, reaches the purpose of protection with this.But, encryption
There are some shortcomings being difficult to overcome in technology itself, the data after encryption are easier to cause the attention of assailant, along with computer
Develop rapidly so that code breaking ability is increasingly stronger, the safety of ordinary cryptographic receives threat greatly.More serious
It is that once the password person of being hacked decodes, and digital product will lose protection, it is easy to occur that pirate infringement, unauthorized access, malice are usurped
The behavior such as change.
Digital watermark technology compensate for the deficiency of conventional encryption technique, gradually grows up.One complete digital watermarking
Scheme generally comprises three parts: watermark generation, watermark embedding, watermark extracting or detection.Specifically, digital watermark technology is actual
On be by carrier medium analysis, watermark pretreatment, watermark embedded location select, watermark embedded mode design, watermark extracting
The key links such as mode design carry out reasonably optimizing, on the premise of preferentially meeting primary demand, seek to solve not sentience,
Quasi-optimal design problem under security reliability, robustness main constraints.The basic process of digital watermark embedding such as Fig. 1
Shown in, the content of its input includes original watermark information, initial carrier dataWith an optional key, output
Result is the data containing watermark.Watermark generating algorithmShould ensure that the uniqueness of watermark, effectiveness, irreversibility etc. belong to
Property.KeyCan be used to add strong security, to avoid undelegated watermark recovery or watermark extracting.Watermark can be defined by following formula
The general process embedded:
Wherein,Represent the data after embedding watermark (i.e. the data containing watermark)；For watermarking algorithm；Represent original
Carrier data；Represent original watermark information；Represent cipher key sets.Here keyIt is option, is generally used for watermark letter
Number extraction.
Fig. 2 is the general process that digital watermarking is extracted, and its process can need the ginseng of initial carrier image or original watermark
With, it is also possible to need not the watermark extraction process under these information, different situations can be described as follows.
Need initial carrier dataTime:
Need original watermarkTime:
When there is no raw information:
Wherein,Represent the watermark extracted；For watermark extraction algorithm；Represent the data containing watermark.
Utilize above-mentioned digital watermark technology when satellite remote-sensing image SHP dot file is encrypted, need whole figure
Sheet all regards watermark information, and is mainly limited to the process of watermark picture and is generated 0,1 binary sequence, and do so wastes
During Fourier transformation, the imaginary part of produced plural number array, too increases the overhead of watermark information simultaneously, adds watermark
The space hold amount of information.
Summary of the invention
It is an object of the invention to provide digital watermark embedding and the extracting method of a kind of satellite remote-sensing image SHP dot file,
The method can the satellite remote-sensing image of SHP form is carried out product quality supervision, ensure product information safely, review relevant
While responsibility, reduce storage redundancy, and then in a small amount of space, deposit more watermark information.
In order to achieve the above object, the technical solution that the present invention is taked is as follows.
The digital watermark embedding process of satellite remote-sensing image SHP dot file, comprises the steps:
Step 1 carries out disorder processing to the bmp file as watermark picture, and scrambling process is each pixel of original image
Transverse and longitudinal coordinate be multiplied by a matrix, obtain new coordinate, then with new coordinate divided by the length of image and wide remainder number, obtain every
The new coordinate of one pixel.
WhereinIt is respectively original image transverse and longitudinal coordinate,Respectively it is multiplied by the transverse and longitudinal coordinate after matrix,
Transverse and longitudinal coordinate newly obtained after being respectively disorder processing,For length and the width of bmp image, unit is picture
Element；
Step 2: by the two-value bmp image after conversion, being transformed to vector image, mapping mode for finding out all pixel values in figure is
0(i.e. black) point, record successively these point coordinate；
Step 3: to coordinateCarry out reducing process, by coordinateIt is multiplied by a fixed coefficient (divided by watermark figure
Pixel count as long and wide), allow all values be both less than 1；
Wherein, 32 is the watermarking images length and wide pixel value set herein, and M is bmp picture black pixel after disorder processing
Number,The coordinate sequence of all black color dots after processing for scaling；
Step 4: using the abscissa of original point file data sequence as real, vertical coordinate is as the imaginary part of plural number, raw
Pluralize array, carries out Fourier transformation, obtains the coefficient after Fourier transformation
Wherein,For original point file data sequence,For the data sequence after Fourier transformation, N is dot file
The sum of midpoint entity,It is respectively the transverse and longitudinal coordinate of some entity,For the coefficient after Fourier transformation；
Step 5: the coordinate sequence of the black color dots that pretreatment is obtainedIt is denoted as, do Fourier transformation, obtain
Sequence after conversion；
Wherein,As the real part of sequence of complex numbers,As the imaginary part of sequence of complex numbers,For obtaining after Fourier transformation
The sequence arrived；
Step 6: sued for peace by the coordinate sequence of the dot file data sequence obtained after Fourier transformation and black color dots, obtains embedding water
The sequence of print, and this sequence is made inverse discrete Fourier transform, obtain the dot file coordinate sequence after embedding watermark；
Wherein,For summation after sequence,For the embedding watermark sequence obtained after making inverse discrete Fourier transform
Row,It is the transverse and longitudinal coordinate of the point after embedding watermark, completes watermark and embed.
Process is extracted in the digital watermarking of satellite remote-sensing image SHP dot file, comprises the steps:
Step 1: to original image, embedded the image of watermark, make fast Fourier respectively and become
Change,
Wherein,Represent former vector image,For former vector image coordinate,Represent image after conversion,
For conversion after image coordinate,Represent and embed image after watermark,For embedding the image coordinate of watermark,
Watermarking images is contained after representing conversion,For embedding the image coordinate of watermark after conversion, N and M is respectively original image
With the number containing watermarking images midpoint entity；
Step 2: calculate the difference of the sequence after two Fourier transformations of previous step, obtain with containing after watermarking images Fourier transformation
Plural array, subtract each other with the plural array after original image Fourier transformation, the difference obtained is the Fourier of watermark information
Array after conversion, takes less counting as the number subtracted each other in N, M, then carries out inverse fast Fourier transform, draw watermark
Vector Message,
Wherein,For the array obtained after subtracting each other,For its coordinate figure,For the number subtracted each other,For
The Vector Message of watermark,For its coordinate figure；
Step 3: obtainIt is multiplied by coefficient (length of watermark picture and wide picture during watermark picture pretreatment
Prime number, i.e. 32), the decimal place of point coordinates rounds, and is black according to the point of the coordinate stored in Vector Message, remaining coordinate points
For the rule of white, construct bmp bianry image；
Step 4: by the bmp bianry image that constructs in step 3 again through disorder processing, the image obtained is watermarking images,
Watermark extracting terminates.
The present invention is using watermark picture as the vectogram on logical meaning, and what plural number array was deposited respectively is, and pixel is black
The x of point, y-coordinate, the quantity of information deposited is constant, and the space taken greatly reduces, and can deposit in a small amount of space
More watermark information.
It is coordinate sequence due to carry out the watermark information of Fourier transformation is deposited, so the coordinate figure of x, y may
Bigger, thus the precision of former vector image is produced some impacts.The present invention is to use coordinate sequence divided by the length of watermark picture
With wide pixel count, thus the coordinate sequence obtained is the sequence less than 1, so would not make the use value of original image
Become large effect.
Accompanying drawing explanation
The basic process of Fig. 1 digital watermark embedding.
The general process that Fig. 2 digital watermarking is extracted.
Fig. 3 SHP file watermark embeds detailed process.
Fig. 4 SHP file watermark extracting detailed process.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in detail:
The concrete telescopiny of digital watermarking of a kind of satellite remote-sensing image SHP dot file is as it is shown on figure 3, word is described as follows:
Step 1: before embedding watermark, first has to that the bmp file as watermark picture carries out Arnold scramble and (becomes also known as cat face
Change), scrambling process is that the transverse and longitudinal coordinate of each pixel of original image is multiplied by a matrix, obtains new coordinate, then with new
Coordinate divided by the length of image and wide remainder number, obtain the new coordinate of each pixel,
WhereinIt is respectively original image transverse and longitudinal coordinate,Respectively it is multiplied by the transverse and longitudinal coordinate after matrix,
Transverse and longitudinal coordinate newly obtained after being respectively disorder processing,For length and the width of bmp image, unit is picture
Element, the present invention all takes 31；The number of times times of scramble will be able to use during watermark extracting below as key；
Step 2: the two-value bmp image after conversion is transformed to vector image, and mapping mode is 0 for finding out all pixel values in figure
The point of (i.e. black), records the coordinate of these points successively；
Step 3: in order to reduce the embedding watermark impact on original image, by coordinateIt is multiplied by a fixed coefficient, this
Bright for watermarking images length with the inverse of wide pixel count, the present invention takes, allow all values be both less than 1 thus reduce and image is believed
The image of breath；
Wherein, 32 is the watermarking images length and wide pixel value set herein, and M is bmp picture black pixel after disorder processing
Number,Coordinate sequence for all black color dots；
Step 4: the abscissa of original point file data sequence, is entered as real, vertical coordinate as the imaginary part of plural number
Row Fourier transformation, obtains the coefficient after Fourier transformation
Wherein,For original point file data sequence,For the data sequence after Fourier transformation, N is dot file
The sum of midpoint entity,It is respectively the transverse and longitudinal coordinate of some entity,For the coefficient after Fourier transformation；
Step 5: the coordinate sequence of the black color dots that pretreatment is obtainedIt is denoted as, do Fourier transformation.
Wherein,As the real part of sequence of complex numbers,As the imaginary part of sequence of complex numbers,For Fourier transformation
After the sequence that obtains.
Step 6: use additivity quasi-the coordinate sequence of the dot file data sequence obtained after Fourier transformation and black color dots
Then sue for peace, obtain embedding the sequence of watermark, and this sequence is made inverse discrete Fourier transform, obtain the dot file after embedding watermark
Coordinate sequence；
Wherein,For summation after sequence,For the embedding watermark sequence obtained after making inverse discrete Fourier transform
Row,Being the transverse and longitudinal coordinate of the point after embedding watermark, watermark embeds and terminates.
The digital watermarking of a kind of satellite remote-sensing image SHP dot file extracts process as shown in Figure 4, and word is described as follows:
Step 1: to original imageWith the image containing watermarkDo fast Fourier transform respectively；
Wherein,Represent original image,For coordinates of original image coordinates,Represent image after conversion,
For conversion after image coordinate,Represent and embed image after watermark,For embedding the image coordinate of watermark,
Watermarking images is contained after representing conversion,For embedding the image coordinate of watermark after conversion, N and M is respectively original image
With the number containing watermarking images midpoint entity；
Step 2: with containing the plural array obtained after watermarking images Fourier transformation, with the plural number after original image Fourier transformation
Array is subtracted each other, and the difference obtained is the array after the Fourier transformation of watermark information, takes number less in N, M individual as subtract each other
Number.Carry out inverse fast Fourier transform again, draw the Vector Message of watermark
Wherein,For the array obtained after subtracting each other,For its coordinate figure,For the number subtracted each other,For
The Vector Message of watermark,For its coordinate figure.
Step 3: the Vector Message obtained in step 2 is multiplied by coefficient during watermark picture pretreatment, the decimal of point coordinates
Position rounds, and is black according to the point of the coordinate stored in Vector Message, and remaining coordinate points is the rule of white, constructs bmp
Bianry image；
Step 4: by the bmp bianry image that constructs in step 3 again through disorder processing, the image obtained is watermarking images,
Watermark extracting terminates.Disorder processing (conversion of cat face) used by the present invention is periodic transformation, say, that through certain
Number of transitions, may finally switch back to original image, and the watermark picture that the present invention uses is 32*32 pixel, and transformation period is
24, the bmp bianry image constructed in step 3 is passed through againSecondary disorder processing, the image obtained is watermark
Image, watermark extracting terminates.
Claims (2)
1. the digital watermark embedding process of a satellite remote-sensing image SHP dot file, it is characterised in that comprise the steps:
Step 1 carries out disorder processing to the bmp file as watermark picture, and scrambling process is each pixel of original image
Transverse and longitudinal coordinate be multiplied by a matrix, obtain new coordinate, then with new coordinate divided by the length of image and wide remainder number, obtain every
The new coordinate of one pixel,
WhereinIt is respectively original image transverse and longitudinal coordinate,Respectively it is multiplied by the transverse and longitudinal coordinate after matrix,Point
Transverse and longitudinal coordinate that Wei be not newly obtained after disorder processing,For length and the width of bmp image, unit is picture
Element；
Step 2: by the two-value bmp image after conversion, being transformed to vector image, mapping mode for finding out all pixel values in figure is
0(i.e. black) point, record successively these point coordinate；
Step 3: to coordinateCarry out reducing process, by coordinateIt is multiplied by a fixed coefficient (divided by watermarking images
Long and wide pixel count), allow all values be both less than 1；
Wherein, 32 is the watermarking images length and wide pixel value set herein, and M is bmp picture black pixel after disorder processing
Number,The coordinate sequence of all black color dots after processing for scaling；
Step 4: using the abscissa of original point file data sequence as real, vertical coordinate is as the imaginary part of plural number, raw
Pluralize array, carries out Fourier transformation, obtains the coefficient after Fourier transformation
Wherein,For original point file data sequence,For the data sequence after Fourier transformation, N is dot file
The sum of midpoint entity,It is respectively the transverse and longitudinal coordinate of some entity,For the coefficient after Fourier transformation；
Step 5: the coordinate sequence of the black color dots that pretreatment is obtainedIt is denoted as, do Fourier transformation, obtain
Sequence after conversion；
Wherein,As the real part of sequence of complex numbers,As the imaginary part of sequence of complex numbers,For obtaining after Fourier transformation
The sequence arrived；
Step 6: sued for peace by the coordinate sequence of the dot file data sequence obtained after Fourier transformation and black color dots, obtains embedding water
The sequence of print, and this sequence is made inverse discrete Fourier transform, obtain the dot file coordinate sequence after embedding watermark；
Wherein,For summation after sequence,For the embedding watermark sequence obtained after making inverse discrete Fourier transform
Row,It is the transverse and longitudinal coordinate of the point after embedding watermark, completes watermark and embed.
Process is extracted in the digital watermarking of satellite remote-sensing image SHP dot file the most according to claim 1, it is characterised in that
Comprise the steps:
Step 1: to original image, embedded the image of watermark, make fast Fourier respectively and become
Change,
Wherein,Represent former vector image,For former vector image coordinate,Represent image after conversion,
For conversion after image coordinate,Represent and embed image after watermark,For embedding the image coordinate of watermark,
Watermarking images is contained after representing conversion,For embedding the image coordinate of watermark after conversion, N and M is respectively original image
With the number containing watermarking images midpoint entity；
Step 2: calculate the difference of the sequence after two Fourier transformations of previous step, obtain with containing after watermarking images Fourier transformation
Plural array, subtract each other with the plural array after original image Fourier transformation, the difference obtained is the Fourier of watermark information
Array after conversion, takes less counting as the number subtracted each other in N, M, then carries out inverse fast Fourier transform, draw watermark
Vector Message,
Wherein,For the array obtained after subtracting each other,For its coordinate figure,For the number subtracted each other,For
The Vector Message of watermark,For its coordinate figure；
Step 3: obtainIt is multiplied by coefficient (length of watermark picture and wide pixel during watermark picture pretreatment
Number, i.e. 32), the decimal place of point coordinates rounds, and is black according to the point of the coordinate stored in Vector Message, and remaining coordinate points is
The rule of white, constructs bmp bianry image；
Step 4: by the bmp bianry image that constructs in step 3 again through disorder processing, the image obtained is watermarking images,
Watermark extracting terminates.
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| CN110059719A (en) * | 2019-03-18 | 2019-07-26 | 西北工业大学 | A kind of target identification method of the image moment based on Walsh transformation |
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