CN103985079B - Digital image tampering detection method with stealthy watermark - Google Patents

Digital image tampering detection method with stealthy watermark Download PDF

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CN103985079B
CN103985079B CN201410217258.7A CN201410217258A CN103985079B CN 103985079 B CN103985079 B CN 103985079B CN 201410217258 A CN201410217258 A CN 201410217258A CN 103985079 B CN103985079 B CN 103985079B
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image
pixel
watermark
encrypted
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CN103985079A (en
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徐贵力
李旭
刘常德
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Beijing chain growth Technology Co.,Ltd.
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Nanjing Yin Mowei Electronic Science And Technology Co Ltd
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Abstract

The invention discloses a kind of digital image tampering detection method with stealthy watermark, carries out stealthy watermark encrypting to digital picture first：Host image and encrypted watermark image are represented with picture element matrix form respectively, the picture element matrix Jing watermark encrypting algorithms of encrypted watermark image are embedded in host image；Secondly the digital picture of band stealth watermark is decoded：The picture element matrix of reduction watermarking images is extracted from the picture element matrix of host image through watermark decoding algorithm；Finally compare encrypted watermark image and reduction watermarking images：If the picture element matrix of encrypted watermark image is equal with the picture element matrix of reduction watermarking images, illustrates that host image is not tampered with, otherwise, illustrate that host image is tampered.Inventive algorithm is simple, easy to operation, can quickly judge whether image occurs tampering detection, beneficial to copyright protection.

Description

Digital image tampering detection method with stealthy watermark
Technical field
The present invention relates to digital image watermarking technology, more particularly to the digital image tampering detection method with stealthy watermark, Belong to technical field of image processing.
Background technology
With the development of multimedia technology, people become further frequent using with digital products such as image, videos, to these The utilization field of digital product also more and more extensively, so the original identification, tampering detection for picture become one it is prominent Problem.
The content of the invention
It is an object of the invention to provide a kind of digital image tampering detection method with stealthy watermark, can effective detection place Whether master image distorts.
The technical solution adopted in the present invention is：Digital image tampering detection method with stealthy watermark, including following step Suddenly：
Step one：Stealthy watermark encrypting is carried out to digital picture：By host image and encrypted watermark image respectively with pixel Matrix form represents, the picture element matrix Jing watermark encrypting algorithms of encrypted watermark image is embedded in host image；
Step 2：The digital picture of band stealth watermark is decoded：Through watermark from the picture element matrix of host image Decoding algorithm extracts the picture element matrix of reduction watermarking images；
Step 3：Compare encrypted watermark image and reduction watermarking images：If the picture element matrix of encrypted watermark image and reduction The picture element matrix of watermarking images is equal, then illustrate that host image is not tampered with, otherwise, illustrate that host image is tampered.
The watermark encrypting algorithm comprises the steps：
1) host image and encrypted watermark image are represented with picture element matrix form respectively：
If the picture element matrix of host image is made up of N rows × M row arrangement of subpixels, A is designated asNM, ANMIn the i-th row, jth The sub-pixel of row is designated as aij；Wherein, 1≤i≤N, 1≤j≤M, 0≤aij≤255；
If the picture element matrix of encrypted watermark image is made up of n rows × m row arrangement of subpixels, B is designated asnm, BnmIn s rows, The sub-pixel of t row is designated as bst；Wherein, 1≤s≤n, 1≤t≤m, 0≤bst≤255；
Wherein, N >=n, M >=3m；
2) extract BnmHundred, ten, individual position of sub-pixel：If sub-pixel bstHundred, ten, individual position be designated as respectively x, y、z；
3) by ANMIn sub-pixel to be encrypted individual position zero：Selected ANMMiddle be expert at value is not more than n, and place train value No more than the sub-pixel of 3m is sub-pixel to be encrypted, by the individual position zero of sub-pixel to be encrypted, the son after the i-th row, jth row zero Pixel is with a "ijRepresent；
4) by encrypted watermark image embedded host image：By ANMIn the i-th row, jth row encryption after sub-pixel be designated as
By sub-pixel bstHundred x and a "s(3t-2)It is added, then
By sub-pixel bstTen y and a "s(3t-1)It is added, then
By sub-pixel bstIndividual position z and a "s(3t)It is added, then
The rest may be inferred, until by BnmIn all sub-pixels be embedded into ANMIn, ANMIn the sub-pixel that is not encrypted protect Hold constant, image pixel matrix C after thus being encryptedNM。
The watermark decoding algorithm comprises the steps：
1) select CNMIn so that be expert at value is by n and place train value is 1 with value of being expert at for 3m and place train value is two of 1 It is region to be decoded that element is rectangular area determined by summit；
2) in region to be decoded, with behavior unit, from left to right successively in CNMIn take three sub-pixels, and extract three The units of sub-pixel：If from CNMThree sub-pixels that middle pth row is taken are respectivelyWherein,'s Units is designated as x ',Units be designated as y ',Units be designated as z '；Q represents first sub- picture that p rows are taken The train value of element；
3) units of three sub-pixels is multiplied by into 100,10,1 respectively, and is sued for peace, reduction draws reduction watermarking images Picture element matrixIn sub-pixel： RepresentMiddle pth row, the The sub-pixel of row.
Compared with prior art, the beneficial effect reached by the present invention：There is provided a kind of digital picture with stealthy watermark Altering detecting method, its algorithm are simple, easy to operation, can quickly judge whether image occurs tampering detection, beneficial to version Power protection；By adjusting unessential data, less is affected on the visual effect of original image；Also, the method amount of calculation is little, Meet requirement of real-time.
Description of the drawings
Fig. 1 is the operational flowchart of the present invention.
Specific embodiment
Following examples are only used for clearly illustrating technical scheme, and can not limit the present invention with this Protection domain.
As shown in figure 1, the digital image tampering detection method with stealthy watermark, comprises the steps：
Step one：Stealthy watermark encrypting is carried out to digital picture：By host image and encrypted watermark image respectively with pixel Matrix form represents, the picture element matrix Jing watermark encrypting algorithms of encrypted watermark image is embedded in host image.
Watermark encrypting algorithm comprises the steps：
1) host image and encrypted watermark image are represented with picture element matrix form respectively：
If the picture element matrix of host image is made up of N rows × M row arrangement of subpixels, A is designated asNM, ANMIn the i-th row, jth The sub-pixel of row is designated as aij；Wherein, 1≤i≤N, 1≤j≤M, 0≤aij≤255；
If the picture element matrix of encrypted watermark image is made up of n rows × m row arrangement of subpixels, B is designated asnm, BnmIn s rows, The sub-pixel of t row is designated as bst；Wherein, 1≤s≤n, 1≤t≤m, 0≤bst≤255；
Wherein, N >=n, M >=3m；
2) extract BnmHundred, ten, individual position of sub-pixel：If sub-pixel bstHundred, ten, individual position be designated as respectively x, y、z；
3) by ANMIn sub-pixel to be encrypted individual position zero：Selected ANMMiddle be expert at value is not more than n, and place train value No more than the sub-pixel of 3m is sub-pixel to be encrypted, by the individual position zero of sub-pixel to be encrypted, the son after the i-th row, jth row zero Pixel is with a "ijRepresent；
4) by encrypted watermark image embedded host image：By ANMIn the i-th row, jth row encryption after sub-pixel be designated as
By sub-pixel bstHundred x and a "s(3t-2)It is added, then
By sub-pixel bstTen y and a "s(3t-1)It is added, then
By sub-pixel bstIndividual position z and a "s(3t)It is added, then
The rest may be inferred, until by BnmIn all sub-pixels be embedded into ANMIn, ANMIn the sub-pixel that is not encrypted protect Hold constant, image pixel matrix C after thus being encryptedNM。
Now to illustrate explanation is further explained to above-mentioned watermark encrypting algorithm：By host image with picture element matrix form table Show, it is assumed that to assume ANMFor 8 row, 8 column matrix：
Equally, encrypted watermark image is represented with picture element matrix form, it is assumed that BnmFor 2 row, 2 column matrix：
Assume a11=207, a12=143, a13=89, b11=120, extract b11Hundred, ten, individual position be designated as respectively x, Y, z, then x=1, y=2, z=0, with b11Corresponding sub-pixel to be encrypted is a11, a12, a13, by a11, a12, a13Individual position return Zero, obtain a "11, a "12, a "13, then a "11=200, a "12=140, a "13=80, then by x and a "11It is added, obtainsBy y and a "12It is added, obtainsBy z and a "13It is added, obtainsIdentical, if a14=137, a15=123, a16=29, b12=13, thenIf a21=47, a22=142, a23=189, b21=246, ThenIf a24=242, a25=172, a26=191, b22= 135, thenA8×8In be not encrypted Sub-pixel keep constant, image pixel matrix C after thus being encrypted8×8：
Step 2：The digital picture of band stealth watermark is decoded：Through watermark from the picture element matrix of host image Decoding algorithm extracts the picture element matrix of reduction watermarking images；
Watermark decoding algorithm comprises the steps：
1) select CNMIn so that be expert at value is by n and place train value is 1 with value of being expert at for 3m and place train value is two of 1 It is region to be decoded that element is rectangular area determined by summit；
2) in region to be decoded, with behavior unit, from left to right successively in CNMIn take three sub-pixels, and extract three The units of sub-pixel：If from CNMThree sub-pixels that middle pth row is taken are respectivelyWherein,'s Units is designated as x ',Units be designated as y ',Units be designated as z '；Q represents first sub- picture that p rows are taken The train value of element；
3) units of three sub-pixels is multiplied by into 100,10,1 respectively, and is sued for peace, reduction draws reduction watermarking images Picture element matrixIn sub-pixel： RepresentMiddle pth row, the The sub-pixel of row.
Now with image pixel matrix C after encryption8×8As a example by：
To C8×8Carry out decoding computing, it is known that the picture element matrix B of encrypted watermark imagenmFor 2 row, 2 column matrix, i.e. n=m=2, C8×8Middle row value is not more than 2, and it is region to be decoded that train value is not more than 6 region, from C8×8The first row starts, and 3 are from left to right One group takes sub-pixel, and first group is： Units be designated as x '=1, Digit is designated as y '=2,Units be designated as z '=0；Second group is： Units be designated as x '=0,Units be designated as y '=1,Individual position Number scale is z '=3；After the completion of the first row decoding, continue the decoding of the second row, Draw Thus obtain reducing the picture element matrix of watermarking images
Step 3：Compare encrypted watermark image and reduction watermarking images：If the picture element matrix of encrypted watermark image and reduction The picture element matrix of watermarking images is equal, then illustrate that host image is not tampered with, otherwise, illustrate that host image is tampered.Even B2×2 WithIt is equal, then illustrate that host image is not tampered with, and otherwise, illustrates that host image is tampered.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, on the premise of without departing from the technology of the present invention principle, some improvement and deformation can also be made, these improve and deform Also should be regarded as protection scope of the present invention.

Claims (2)

1. the digital image tampering detection method with stealthy watermark, it is characterised in that comprise the steps：
Step one：Stealthy watermark encrypting is carried out to digital picture：By host image and encrypted watermark image respectively with picture element matrix Form represents, the picture element matrix Jing watermark encrypting algorithms of encrypted watermark image is embedded in host image；
The watermark encrypting algorithm comprises the steps：
1) host image and encrypted watermark image are represented with picture element matrix form respectively：
If the picture element matrix of host image is made up of N rows × M row arrangement of subpixels, A is designated asNM, ANMIn the i-th row, jth row son Pixel is designated as aij；Wherein, 1≤i≤N, 1≤j≤M, 0≤aij≤255；
If the picture element matrix of encrypted watermark image is made up of n rows × m row arrangement of subpixels, B is designated asnm, BnmIn s rows, t row Sub-pixel be designated as bst；Wherein, 1≤s≤n, 1≤t≤m, 0≤bst≤255；
Wherein, N >=n, M >=3m；
2) extract BnmHundred, ten, individual position of sub-pixel：If sub-pixel bstHundred, ten, individual position be designated as x, y, z respectively；
3) by ANMIn sub-pixel to be encrypted individual position zero：Selected ANMMiddle be expert at value is not more than n, and place train value is not more than The sub-pixel of 3m is sub-pixel to be encrypted, and the individual position zero of sub-pixel to be encrypted, the sub-pixel after the i-th row, jth row zero are used a″ijRepresent；
4) by encrypted watermark image embedded host image：By ANMIn the i-th row, jth row encryption after sub-pixel be designated as
By sub-pixel bstHundred x and a "s(3t-2)It is added, then
By sub-pixel bstTen y and a "s(3t-1)It is added, then
By sub-pixel bstIndividual position z and a "s(3t)It is added, then
The rest may be inferred, until by BnmIn all sub-pixels be embedded into ANMIn, ANMIn the sub-pixel that is not encrypted keep not Become, image pixel matrix C after thus being encryptedNM；
Step 2：The digital picture of band stealth watermark is decoded：Decode through watermark from the picture element matrix of host image Algorithm extracts the picture element matrix of reduction watermarking images；
Step 3：Compare encrypted watermark image and reduction watermarking images：If the picture element matrix of encrypted watermark image and reduction watermark The picture element matrix of image is equal, then illustrate that host image is not tampered with, otherwise, illustrate that host image is tampered.
2. the digital image tampering detection method with stealthy watermark according to claim 1, it is characterised in that the watermark Decoding algorithm comprises the steps：
1) select CNMIn be expert at value by n and place train value for 3m be expert at value be 1 and place train value be 1 two elements The rectangular area determined by summit is region to be decoded；
2) in region to be decoded, with behavior unit, from left to right successively in CNMIn take three sub-pixels, and extract three sub- pictures The units of element：If from CNMThree sub-pixels that middle pth row is taken are respectivelyWherein,Individual position Number scale is x ',Units be designated as y ',Units be designated as z '；Q represents first sub-pixel that p rows are taken Train value；
3) units of three sub-pixels is multiplied by into 100,10,1 respectively, and is sued for peace, reduction draws the pixel of reduction watermarking images MatrixIn sub-pixel： RepresentMiddle pth row, theThe sub- picture of row Element.
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