CN102236882A - Encrypted holographic watermark algorithm of transform domain based on copyright protection - Google Patents
Encrypted holographic watermark algorithm of transform domain based on copyright protection Download PDFInfo
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Abstract
The invention relates to an encrypted holographic watermark algorithm of a transform domain based on copyright protection, comprising the following steps of: carrying out random double-phase modulation on watermark information to generate a watermark holographic image; then carrying out 4*4 partitioning on an L component of a carrier image in a Lab space; carrying out DCT (Discrete Cosine Transformation) conversion on each partition; extracting a middle-low frequency coefficient of each matrix to form a new matrix and carrying out wavelet decomposition on the new matrix; embedding the watermark holographic image into the middle-low frequency wavelet coefficient to obtain an embedded colorful image; and then extracting the watermark image again by directionally operating the steps. The watermark has good invisibility and higher safety by carrying out random double-phase encryption on the watermark image; and the original image is not needed in the step of extracting the watermark image, and the watermark belongs to a blind testing watermark.
Description
Technical field
The present invention relates to a kind of digital watermark, particularly a kind of transform domain based on copyright protection is encrypted the holographic watermark algorithm.
Background technology
Multimedia technology and development of internet technology have promoted the progress of digital watermark technology.Digital watermark technology is a kind of effective way of digital copyright protecting.The data of multimedia transmission are based on coloured image, and existing a large amount of ripe watermarking algorithm at gray level image is not suitable for directly coloured image being used, and the practical Watermarking of Color of research has very important and practical meanings.
The research direction of digital watermark mainly concentrates in the transform domain.Mainly some pixel value comes embed watermark to the spatial domain method in the original image by changing, and robustness and invisibility are poor.The transform domain method is with certain conversion of view data process, and comes embed watermark by changing conversion coefficient.
Summary of the invention
The present invention be directed to the problem that present digital watermark exists; proposed a kind of transform domain and encrypted the holographic watermark algorithm based on copyright protection; transform domain technology and encryption holographic watermark technology in conjunction with DCT and DWT; embed watermark in transform domain; energy is distributed on all pixels of image, has guaranteed invisibility, robustness and the security of watermark.
Technical scheme of the present invention is: a kind of transform domain based on copyright protection is encrypted the holographic watermark algorithm, comprises watermarking algorithm and watermark extracting algorithm, and concrete steps are as follows:
Watermarking algorithm:
(1) generate two stochastic matrix p, b, as the quarter-phase of light holophotal system, i.e. the dual key of encrypting and decrypting system; The watermarking images that has generated is carried out the conversion that phase value is p; Image after the conversion is carried out Fourier transform, carry out the conversion that phase value is b then, carry out inverse fourier transform again; After encrypting, double random phase generates in-line holographic image H;
(2) the carrier coloured image is carried out color space conversion, from the RGB color space conversion to device-independent CIELab color space;
(3) from the CIELab space, extract the L component, L is carried out piecemeal according to 4 * 4 size, and then each piece is carried out dct transform, get the matrix that coefficient is formed, extract every matrix of coefficients medium and low frequency coefficient then and form a new matrix D;
(4) matrix D that obtains is carried out wavelet decomposition, get its wavelet low frequency coefficient CA, holographic watermark image H and the low frequency coefficient CA summation that superposes;
(5) wavelet coefficient of the CA component that embeds holographic watermark image H is carried out inverse wavelet transform and obtains the D component, the D component is carried out inverse dct transform obtain the L component, again color space from the CIELab space conversion to rgb space; (6) coloured image after obtaining embedding;
The watermark extracting algorithm:
(a) be the CIELab color space with the RGB color of image space conversion behind the embed watermark, carry out dct transform after getting the piecemeal that its monochrome information L carries out 4 * 4 sizes, get every matrix of coefficients medium and low frequency and form a matrix D;
(b) matrix D of extracting is carried out the one-level wavelet decomposition, get its low frequency wavelet coefficient CA, the CA that embeds after encrypting is carried out Fourier transform;
(c) then it is carried out the conversion of phase value for-b, carry out Fourier inversion then;
(d) at last it is carried out the conversion of phase value for-p, the watermarking images that obtains extracting;
(e) watermarking images that extracts is carried out Gauss's low-pass filtering, again it is carried out binaryzation, obtain watermarking images.
Beneficial effect of the present invention is: the transform domain that the present invention is based on copyright protection is encrypted the holographic watermark algorithm, in conjunction with DCT and two kinds of conversion of DWT advantage separately coloured image digital watermarking algorithm based on DCT and DWT has been proposed, the carrier that utilizes the conversion coefficient of the L component in Lab space to embed as watermark, watermark has good invisibility; Watermarking images is encrypted through double random phase, makes this watermark have higher security; Extracting watermarking images does not need the participation of original image, and this watermark belongs to the blind Detecting watermark.
Description of drawings
Fig. 1 is that the transform domain that the present invention is based on copyright protection is encrypted watermarking algorithm process flow diagram in the holographic watermark algorithm;
Fig. 2 is that the transform domain that the present invention is based on copyright protection is encrypted watermark extracting algorithm flow chart in the holographic watermark algorithm.
Embodiment
In order to guarantee the security of watermark information, encrypt the holographic watermark algorithm based on the transform domain of copyright protection and at first watermark information is carried out the double random phase modulation and generate the watermark hologram; Secondly the L component of carrier image in the Lab space carried out 4 * 4 piecemeals, each piecemeal is carried out dct transform, extract the medium and low frequency coefficient of each matrix, form a new matrix, and it is carried out wavelet decomposition, the watermark hologram is embedded on its medium and low frequency wavelet coefficient, the coloured image after obtaining embedding can extract the operation of step direction once more with watermarking images.
Watermarking algorithm process flow diagram as shown in Figure 1, (1) generates two stochastic matrix p, b, as the quarter-phase of light holophotal system, i.e. the dual key of encrypting and decrypting system; The watermarking images (64 * 64) that has generated is carried out the conversion that phase value is p; Image after the conversion is carried out Fourier transform, carry out the conversion that phase value is b then, carry out inverse fourier transform again; After encrypting, double random phase generates in-line holographic image H; (2) carrier coloured image (512 * 512) is carried out color space conversion, from RGB three primary colours color space conversion to device-independent CIELab color space; (3) from the CIELab space, extract the L component, L is carried out piecemeal according to 4 * 4 size, and then each piece is carried out dct transform, get the matrix that coefficient is formed, extract every matrix of coefficients medium and low frequency coefficient then and form a new matrix D (128 * 128); (4) matrix D that obtains is carried out wavelet decomposition, gets its wavelet low frequency coefficient CA(64 * 64), to holographic watermark image H and the low frequency coefficient CA summation that superposes; (5) wavelet coefficient of the CA component that embeds holographic watermark image H is carried out inverse wavelet transform and obtains the D component, the D component is carried out inverse dct transform obtain the L component, again color space from the CIELab space conversion to rgb space; (6) coloured image after obtaining embedding.The CIELAB color space is the characteristic of international lighting association according to human eye vision, a cover that wavelength of light is converted to brightness and form and aspect is described color data, wherein L describes the brightness of color, and A describes the scope of color from the green to the redness, and B describes the scope of color from the blueness to the yellow.
Watermark extracting algorithm flow chart as shown in Figure 2, (a) be the CIELab color space with the RGB color of image space conversion behind the embed watermark, carry out dct transform after getting the piecemeal that its monochrome information L carries out 4 * 4 sizes, get every matrix of coefficients medium and low frequency and form a matrix D; (b) matrix D of extracting is carried out the one-level wavelet decomposition, get its low frequency wavelet coefficient (CA), the CA that embeds after encrypting is carried out Fourier transform; (c) then it is carried out the conversion of phase value for-b, carry out Fourier inversion then; (d) at last it is carried out the conversion of phase value for-p, the watermarking images that obtains extracting; (e) watermarking images that extracts is carried out Gauss's low-pass filtering, again it is carried out binaryzation, obtain watermarking images.
Claims (1)
1. the transform domain based on copyright protection is encrypted the holographic watermark algorithm, it is characterized in that comprise watermarking algorithm and watermark extracting algorithm, concrete steps are as follows:
Watermarking algorithm:
(1) generate two stochastic matrix p, b, as the quarter-phase of light holophotal system, i.e. the dual key of encrypting and decrypting system; The watermarking images that has generated is carried out the conversion that phase value is p; Image after the conversion is carried out Fourier transform, carry out the conversion that phase value is b then, carry out inverse fourier transform again; After encrypting, double random phase generates in-line holographic image H;
(2) the carrier coloured image is carried out color space conversion, from the RGB color space conversion to device-independent CIELab color space;
(3) from the CIELab space, extract the L component, L is carried out piecemeal according to 4 * 4 size, and then each piece is carried out dct transform, get the matrix that coefficient is formed, extract every matrix of coefficients medium and low frequency coefficient then and form a new matrix D;
(4) matrix D that obtains is carried out wavelet decomposition, get its wavelet low frequency coefficient CA, holographic watermark image H and the low frequency coefficient CA summation that superposes;
(5) wavelet coefficient of the CA component that embeds holographic watermark image H is carried out inverse wavelet transform and obtains the D component, the D component is carried out inverse dct transform obtain the L component, again color space from the CIELab space conversion to rgb space; (6) coloured image after obtaining embedding;
The watermark extracting algorithm:
(a) be the CIELab color space with the RGB color of image space conversion behind the embed watermark, carry out dct transform after getting the piecemeal that its monochrome information L carries out 4 * 4 sizes, get every matrix of coefficients medium and low frequency and form a matrix D;
(b) matrix D of extracting is carried out the one-level wavelet decomposition, get its low frequency wavelet coefficient CA, the CA that embeds after encrypting is carried out Fourier transform;
(c) then it is carried out the conversion of phase value for-b, carry out Fourier inversion then;
(d) at last it is carried out the conversion of phase value for-p, the watermarking images that obtains extracting;
(e) watermarking images that extracts is carried out Gauss's low-pass filtering, again it is carried out binaryzation, obtain watermarking images.
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Cited By (16)
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| CN102592257A (en) * | 2012-01-04 | 2012-07-18 | 上海理工大学 | Cyan, magenta, yellow and black (CMYK) color space-based optical holographic watermark algorithm |
| CN102708536A (en) * | 2012-05-22 | 2012-10-03 | 上海理工大学 | Strong-robustness transform domain encrypted holographic watermarking algorithm |
| CN103366333A (en) * | 2013-07-09 | 2013-10-23 | 上海理工大学 | Standard color space-based color digital holographic watermarking algorithm |
| CN103440608A (en) * | 2013-06-04 | 2013-12-11 | 上海理工大学 | Holographic digital watermark embedding and extracting method based on picture element expansion |
| CN103971323A (en) * | 2014-05-22 | 2014-08-06 | 复旦大学 | Digital watermark steganography method based on scrambling transformation and morphological component analysis |
| CN104036448A (en) * | 2014-06-12 | 2014-09-10 | 上海理工大学 | Digital watermark algorithm for three-dimensional model |
| CN104217392A (en) * | 2014-09-18 | 2014-12-17 | 上海理工大学 | Holographic watermark algorithm resistant to geometric attack |
| CN104268822A (en) * | 2014-09-18 | 2015-01-07 | 上海理工大学 | Anti-fake authentication method for uploaded network picture |
| CN104680470A (en) * | 2013-11-26 | 2015-06-03 | 上海宝钢包装股份有限公司 | Method for embedding and extracting strong robustness hologram watermark on the basis of DWT-SVD (Discrete Wavelet Transform-Singular Value Decomposition) |
| CN105306440A (en) * | 2015-09-19 | 2016-02-03 | 杭州电子科技大学 | Key generation and distribution method based on graph recognition |
| CN105512999A (en) * | 2015-08-24 | 2016-04-20 | 湖南工业大学 | Dual-transform color image holographic watermarking method |
| CN106254889A (en) * | 2016-09-17 | 2016-12-21 | 苏州科技大学 | The compressed sensing reconstructing method of double random-phase encoding components of system as directed ciphertext |
| CN106570813A (en) * | 2016-10-10 | 2017-04-19 | 湖南正晨节能科技有限公司 | Holographic digital watermark embedding method, extraction method and device |
| CN108564519A (en) * | 2017-12-22 | 2018-09-21 | 重庆邮电大学 | A kind of Watermarking for Color Images method based on different transform domain |
| CN113012016A (en) * | 2021-03-25 | 2021-06-22 | 北京有竹居网络技术有限公司 | Watermark embedding method, device, equipment and storage medium |
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| CN102708536A (en) * | 2012-05-22 | 2012-10-03 | 上海理工大学 | Strong-robustness transform domain encrypted holographic watermarking algorithm |
| CN102708536B (en) * | 2012-05-22 | 2014-04-16 | 上海理工大学 | Strong-robustness transform domain encrypted holographic watermarking algorithm |
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| CN104036448B (en) * | 2014-06-12 | 2017-02-15 | 上海理工大学 | Digital watermark algorithm for three-dimensional model |
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| CN105512999A (en) * | 2015-08-24 | 2016-04-20 | 湖南工业大学 | Dual-transform color image holographic watermarking method |
| CN105512999B (en) * | 2015-08-24 | 2019-08-27 | 湖南工业大学 | A kind of color image holographic watermark method of double transformation |
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| CN113129199B (en) * | 2021-05-10 | 2023-03-07 | 杭州天宽科技有限公司 | Dark watermark protection method based on Android platform |
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