CN102592257B - Cyan, magenta, yellow and black (CMYK) color space-based optical holographic watermark algorithm - Google Patents
Cyan, magenta, yellow and black (CMYK) color space-based optical holographic watermark algorithm Download PDFInfo
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- CN102592257B CN102592257B CN 201210000618 CN201210000618A CN102592257B CN 102592257 B CN102592257 B CN 102592257B CN 201210000618 CN201210000618 CN 201210000618 CN 201210000618 A CN201210000618 A CN 201210000618A CN 102592257 B CN102592257 B CN 102592257B
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Abstract
The invention relates to a cyan, magenta, yellow and black (CMYK) color space-based optical holographic watermark algorithm, which comprises the following steps of: performing random phase modulation on a watermark image, and generating a watermark hologram; embedding watermark information into a wavelet coefficient on a Y component of a carrier image in a CMYK space to obtain an embedded color image; and reversing the steps to extract the watermark image again. According to the CMYK color space-based optical holographic watermark algorithm, the advantages of Fourier encrypted holography and wavelet transform are combined, a transform coefficient of the Y component in the CMYK color space is used as a watermark embedding carrier, and watermark has high invisibility; the watermark is subjected to Fourier phase encryption, so that the watermark has high security; and the participation of an original image is not required by the extraction of the watermark image, so that the watermark belongs to blind detected watermark.
Description
Technical field
The present invention relates to a kind of digital watermark technology that is applied to print, particularly a kind of light holographic watermark algorithm based on the CMYK color space.
Background technology
The meaning of studying holographic digital watermarking is to stop printed matter piracy, and it has upgraded the traditional concept of antiforge, has unique character in printed matter anti-counterfeiting, can promote the development of copyright protection authenticated connection.The digital watermarking of hiding in printed matter has only by decryption computer software or specific checkout equipment and just can discern.Watermark printing anti-fake technology does not have specific (special) requirements to printing equipment, and it adds digital watermark information in the plate-making or the process of drawing a design, and need not change printing material and equipment, does not increase printing cost.The watermark of hiding in printed matter watermark information loss behind process duplicating and rescan is very big, can't be detected, and has increased false proof security.
In press, what printing machine and printer adopted is the three former CMYK color spaces of losing lustre, and the colour gamut of CMYK color space is less, if add watermark in the image of other color mode, the conversion of color space can be lost a large amount of watermark informations.
Summary of the invention
The present invention be directed to the present printing watermark problem that watermark information is easily lost when color conversion, a kind of light holographic watermark algorithm based on the CMYK color space has been proposed, combined with wavelet transformed technology and encryption holographic watermark technology adopt symmetrical watermarking images, generate the encrypted watermark hologram; Without the converting colors space, avoided not printing just to cause losing of watermark information artificially; Embed watermark in transform domain has guaranteed invisibility, robustness and the security of watermark.
Technical scheme of the present invention is: a kind of light holographic watermark algorithm based on the CMYK color space, comprise watermarking algorithm and watermark extracting algorithm, and concrete steps comprise as follows:
Watermarking algorithm:
1) generates the accidental enciphering phase mask
With
2) to watermarking images
Carry out
Carry out Fourier transform after the modulation, carry out the accidental enciphering phase mask again
Modulation, generate Fourier transform encrypted hologram picture at last;
3) read the RGB image, this image transitions to the CMYK color space, is extracted the Y component, the Y component is carried out wavelet decomposition; Obtain low frequency component, horizontal component, vertical component, diagonal components after the wavelet decomposition,, obtain second horizontal component, to second horizontal component wavelet decomposition once more again to the horizontal component wavelet decomposition;
4) select suitable embedment strength K, watermark is embedded into second horizontal component respectively through in each component after the wavelet decomposition, again each component is carried out inverse wavelet transform three times, obtain containing the Y component of watermark, merge C, M, Y, K passage, obtain containing the image of the CMYK pattern of watermark, then this image is printed;
The printed images of gathering is carried out the watermark extracting algorithm:
A) gather the watermarking images that contains that prints, this image from the RGB color space conversion to the CMYK color space, extract the Y component of CMYK color space, the Y component is carried out wavelet decomposition, then the horizontal component that obtains is carried out wavelet decomposition, again second horizontal component that obtains is carried out wavelet decomposition;
B) each component and the accidental enciphering phase mask that the second horizontal component wavelet decomposition is obtained
Hologram image multiplies each other, and carries out inverse Fourier transform again, then each watermark information that obtains is superimposed, and has just obtained the watermark of rebuilding.
Beneficial effect of the present invention is: the light holographic watermark algorithm that the present invention is based on the CMYK color space, encrypt holographic and wavelet transformation advantage separately in conjunction with Fourier and proposed light holographic watermark algorithm based on the CMYK color space, the carrier that utilizes the conversion coefficient of the Y component of CMYK color space to embed as watermark, watermark has good invisibility; Watermarking images makes this watermark have higher security through the bit encryption of Fourier's phase; 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 the present invention is based on watermarking algorithm process flow diagram in the light holographic watermark algorithm of CMYK color space;
Fig. 2 the present invention is based on watermark extracting algorithm flow chart in the light holographic watermark algorithm of CMYK color space.
Embodiment
In order to reduce the loss of information, improve the robustness of algorithm, be chosen in CMYK color space embed watermark; Embed watermark can be distributed on all pixels the watermark signal energy in wavelet field, helps guaranteeing the invisibility of watermark and improves the robustness of watermark.Fourier encrypts the holographic watermark technology encryption technology is combined with holographic technique, and the encrypted hologram picture only under the control of key, could be rebuild original image, for hologram image provides security mechanism, thereby has anti-fake effect.
In order to guarantee the security of watermark information, at first watermarking images is carried out the random phase modulation and generate the watermark hologram based on the light holographic watermark algorithm of CMYK color space; Secondly with embed watermark information in the wavelet coefficient on the Y component of carrier image in the CMYK space, the coloured image after obtaining embedding can extract the step reverse operating once more with watermarking images.So the light holographic watermark algorithm based on the CMYK color space comprises watermarking algorithm and watermark extracting algorithm.
Watermarking algorithm process flow diagram as shown in Figure 1, (1) generates the accidental enciphering phase mask
With
(2) to watermarking images
Carry out
Carry out Fourier transform after the modulation, carry out the accidental enciphering phase mask again
Modulation, generate Fourier transform encrypted hologram picture at last; (3) read the RGB image, this image transitions to the CMYK color space, is extracted the Y component, the Y component is carried out wavelet decomposition; Obtain low frequency component (ca_1), horizontal component (ch_1), vertical component (cv_1), diagonal components (cd_) after the wavelet decomposition, again to horizontal component (ch_1) wavelet decomposition, obtain horizontal component (ch_2), to horizontal component (ch_2) wavelet decomposition once more; (4) select suitable embedment strength K, watermark is embedded into horizontal component (ch_2) respectively through in each component after the wavelet decomposition, again each component is carried out inverse wavelet transform three times, obtain containing the Y component of watermark, merge C, M, Y, K passage, obtain containing the image of the CMYK pattern of watermark.
Watermark extracting algorithm flow chart as shown in Figure 2, (a) gather the watermarking images that contains that prints, this image from the RGB color space conversion to the CMYK color space, extract the Y component of CMYK color space, the Y component is carried out wavelet decomposition, then the horizontal component (ch_1) that obtains is carried out wavelet decomposition, again the horizontal component (ch_2) that obtains is carried out wavelet decomposition; (b) each component and the accidental enciphering phase mask that horizontal component (ch_2) wavelet decomposition is obtained
Hologram image multiplies each other, and carries out inverse Fourier transform again, then each watermark information that obtains is superimposed, and has just obtained the watermark of rebuilding; The process of rebuilding watermark does not need the participation of original image, belongs to blind extractive technique.
Claims (1)
1. the light holographic watermark algorithm based on the CMYK color space is characterized in that, comprise watermarking algorithm and watermark extracting algorithm, concrete steps comprise as follows:
Watermarking algorithm:
1) generates the accidental enciphering phase mask
With
2) to watermarking images
Carry out
Carry out Fourier transform after the modulation, carry out the accidental enciphering phase mask again
Modulation, generate Fourier transform encrypted hologram picture at last;
3) read the RGB image, this image transitions to the CMYK color space, is extracted the Y component, the Y component is carried out wavelet decomposition; Obtain low frequency component, horizontal component, vertical component, diagonal components after the wavelet decomposition,, obtain second horizontal component, to second horizontal component wavelet decomposition once more again to the horizontal component wavelet decomposition;
4) select suitable embedment strength K, watermark is embedded into second horizontal component respectively through in each component after the wavelet decomposition, again each component is carried out inverse wavelet transform three times, obtain containing the Y component of watermark, merge C, M, Y, K passage, obtain containing the image of the CMYK pattern of watermark, then this image is printed;
The printed images of gathering is carried out the watermark extracting algorithm:
A) gather the watermarking images that contains that prints, this image from the RGB color space conversion to the CMYK color space, extract the Y component of CMYK color space, the Y component is carried out wavelet decomposition, then the horizontal component that obtains is carried out wavelet decomposition, again second horizontal component that obtains is carried out wavelet decomposition;
B) each component and the accidental enciphering phase mask that the second horizontal component wavelet decomposition is obtained
Hologram image multiplies each other, and carries out inverse Fourier transform again, then each watermark information that obtains is superimposed, and has just obtained the watermark of rebuilding.
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102909981A (en) * | 2012-10-26 | 2013-02-06 | 武汉虹之彩包装印刷有限公司 | Novel alumite based on digital watermarking technology and production method thereof |
| 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 |
| 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) |
| CN103996166A (en) * | 2014-06-05 | 2014-08-20 | 上海理工大学 | Holographic anti-counterfeiting algorithm based on shape of screen dot |
| CN104143172B (en) * | 2014-07-11 | 2018-09-18 | 上海理工大学 | A kind of coloured image holographic watermark method based on wavelet de-noising |
| EP3164849B1 (en) * | 2014-08-12 | 2020-05-06 | Digimarc Corporation | Data hiding for spot colors in product packaging |
| CN104268822A (en) * | 2014-09-18 | 2015-01-07 | 上海理工大学 | Anti-fake authentication method for uploaded network picture |
| CN104217392A (en) * | 2014-09-18 | 2014-12-17 | 上海理工大学 | Holographic watermark algorithm resistant to geometric attack |
| CN107341759A (en) * | 2017-07-17 | 2017-11-10 | 惠州Tcl移动通信有限公司 | A kind of method, storage medium and electronic equipment for adding blind watermatking to image |
| CN108734622B (en) * | 2018-05-24 | 2022-03-25 | 上海理工大学 | Watermark processing method for printed image |
| CN109785223A (en) * | 2019-01-17 | 2019-05-21 | 江苏保旺达软件技术有限公司 | A method of addition digital watermarking |
| CN110782381A (en) * | 2019-09-12 | 2020-02-11 | 天津市职业大学 | Narrow-color-gamut printing-scanning-resistant digital watermark manufacturing method |
| CN111340689B (en) * | 2020-03-02 | 2022-06-28 | 周晓明 | Generation method and system for composite image |
| CN111598197A (en) * | 2020-05-18 | 2020-08-28 | 燕山大学 | QR code encryption and decryption method and system based on wavelet and magic square transformation |
| CN114670564B (en) * | 2022-03-28 | 2024-03-22 | 深圳新宏泽包装有限公司 | Intelligent printing method for packaging box with anti-counterfeiting hologram |
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| KR100576802B1 (en) * | 2003-10-29 | 2006-05-10 | 한국전자통신연구원 | The Method for embedding and extracting blindly watermarks by using wavelet transform and HVS |
| CN102236882B (en) * | 2011-07-21 | 2012-11-07 | 上海理工大学 | Encrypted holographic watermark algorithm of transform domain based on copyright protection |
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