CN1369376A - Antifraud method for printed matter - Google Patents
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- CN1369376A CN1369376A CN 01135023 CN01135023A CN1369376A CN 1369376 A CN1369376 A CN 1369376A CN 01135023 CN01135023 CN 01135023 CN 01135023 A CN01135023 A CN 01135023A CN 1369376 A CN1369376 A CN 1369376A
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Abstract
An anti-fraud method for printed matter features that the picture to be printed is processed by digital watermark technique and then printed by indistinctly visual ink. Its advantage is high anti-fraud effect.
Description
The present invention is the novel printing product anti-counterfeiting technology of contemporary digital watermark technology of a kind of combination and traditional printing technology, belongs to area of pattern recognition.
The develop rapidly of digitalized network technology has proposed new higher requirement to multimedia copyright protection and content discriminating, and digital watermark technology is answered this requirement to produce and grown up.So-called digital watermarking (Digital Watermarking) is exactly to add some information to reach protection of Intellectual Property Rights such as copyright notice, permission to use condition in multi-medium data (as data signals such as image, audio frequency, videos).The motive power of development digital watermark technology is for multi-medium data provides copyright protection, but in fact digital watermarking is differentiated in the true and false of electronic data, important effect also arranged in the implicit mark of digital product and the confidential corespondence in the network.From application point of view, digital watermarking can be divided into two big classes: robustness watermark (RobustWatermarks can be used for copyright protection) and fragile watermarking (Fragile Watermarks).Fragile watermarking can be used for the multimedia true and false to be differentiated, promptly when content of multimedia falls under suspicion, it is verified, and point out tampered position, even attack type etc.The technical literature that can contrast mainly contains following seven pieces: [1] I.J.Cox, J.Kilian, T.Leighton, and T.Shamoon, Secure Spread Spectrum Watermarking for Multimedia, NEC Research Institute Technical Report95-10,1995.[2] A.Piva, M.Bami, F.Bartolini and V.Cappellini, DCT-based watermark recovering without resorting to the uncorrupted original Image, Proc.of ICIP ' 97, Vol.3, pp.520-523,1997.[3] A.G.Bors and I.Pitas, Image Watermarking using DCT domain constraints, Proc.ofICIP ' 96, Vol.3, pp.231-234,1996.[4] Song Yujie, Liu Ruizhen, Tan Tieniu, a kind of digital watermark technology that is used for printed matter anti-counterfeiting, Chinese image graphics journal, Vol.6 (A), pp., 2001.[5] Y.J.Song, R.Z.Liu, and T.N.Tan, " Digital Watermarking For Forgery Detection In Printed Materials ", Proc.of the 2nd IEEE Pacific-Rim Conference on Multimedia, Beijing, China, October 2001.[6] J.R.Smith and B.O.Comiskey, " Modulation and Information Hiding in Images ", Workshop on Information Hiding, University of Cambridge, UK, pp.463-470, May1996.[7] M.Ramkumar, " Data Hiding In Multimedia-Theory And Applications ", Ph.D.
Dissertation，New?Jersey?Institute?of?Technology，Jan.2000
Although the development pole the earth of digitlization and network communications technology has promoted the propagation and the application of Digital Media; but what can not be ignored is; great amount of images is still and exists with printing form; as: trade mark, the packing of product, books and periodicals; certificate; passport etc., the document copyright protection (books, material etc.) that also has printing form to exist certainly.Over a little years, flourish along with China market economy, counterfeit behavior also is becoming increasingly rampant, and has upset market order, grievous injury producers and consumers's legitimate rights and interests, become big public hazards of Chinese society.The requirement of printing technology process has brought the homogeneity of printed matter, and the operating type that the personator can be routinely is the copying and printing package easily, and counterfeit behavior is repeatedly succeeded.The struggle that combats copyright piracy of people for many years never stopped.People once
Many method for anti-counterfeit in colored printing, have been sought, as laser anti-counterfeit, special-purpose water marked paper is false proof, telephone code is false proof, computer network is false proof or the like.
The objective of the invention is to propose the method for anti-counterfeit of the contemporary digital watermark technology of a kind of combination and traditional invisible printing ink printing technology.The image that to cross through digital watermark processing, the mode by the invisible printing ink technology print is printed onto on the paper.Because implicit printing technology has been adopted in the invisible printing ink printing, has improved the ability of system repeatedly of printed matter.The utilization digital watermark technology is handled image, has guaranteed to be printed the uniqueness of image, has more strengthened the anti-pirate characteristic of printed matter.Simultaneously we have provided a kind of robust digital watermark strategy, it guaranteed implicit printing image through overscanning or after taking wherein watermark information still can be extracted out.This technology can be widely used in the printed matter anti-counterfeiting field, such as trademark anti-counterfeit and certificate false proof etc.Technical essential of the present invention is: 1: based on the robust digital watermark strategy of discrete surplus profound conversion DCT and redundancy encoding
1.1 color space is selected
The robustness of watermark and fragility are to be closely connected together with the distortion of printing in the scanning process.In the printing scanning process, the all images distortion can be summed up as four classes: the one, and to the visible pixel distortion of human eye, the variation, gamma correction, the halftoning of image, change color, the point that mainly contain luminance contrast spread, put the distortion that detection optical diffusion noise and edge high-order noise etc. bring; The 2nd, to the sightless geometric distortion of human eye, mainly contain the distortion that rotation, dimensional variation and shearing etc. bring; The 3rd, the random error that the objective condition of experiment is brought; The 4th, comprised conversion between the digital simulation to the printing of original copy with to the scanning of printed matter, and same image has different color space describing mode on distinct device.Because the difference of each color space gamut when image is changed in different spaces, is wanted drop-out inevitably.
For first three class distortion, can only rely on algorithm and objective experiment condition to reduce.For the 4th class distortion, can reduce by the selection of color space.In at present many color spaces, as color space RGB, CMY in the computer graphics, HIS (HLS, HSB) etc., color TV color space YUV, YIQ, YCrCb etc., based on color space CIExyY, the CIELab of CIE, CIELuv etc., only the color space based on CIE is independent of equipment.Wherein Lab color mode and YUV color space are similar, also are to describe color component with brightness and aberration.It is at present unique can visual sense again can parametric description color space, can describe objective and accurately, transmit, manage and duplicate color, and be independent of equipment.Lab can guarantee not loss of the color in the CMYK scope when carrying out the color mode conversion.Therefore, adopt the basis of the widest CIE Lab color mode of color space as conversion, the interpolation of watermark is all carried out in the Lab space with extraction.
1.2 add and extracting method
When adding watermark, original image is converted into the CIELab describing mode, has only luminance component wherein to add watermark.At first watermark is constructed, the binary bitmap that comprises " very " word with adding is an example, at first is translated into one-dimensional sequence: the every of each character is taken out, and row is one { 0 successively, the 1} sequence, in order to improve the robustness of algorithm, this sequence is turned to 0,1 equally distributed another one sequence at random, and be { 1 with this sequential coding, the 1} sequence is passed through redundancy encoding such as Bose-Chaudhuri-Hocquenghem Code then, and obtaining length is the sequence { w of l
i; Secondly former figure is got dct transform, find out preceding l maximum in DCT coefficient d
iAnd with watermark by linear operation
Add in the DCT coefficient, watermark strength is controlled by α.Carry out the image after inverse transformation can obtain adding watermark then.The image of watermark processing being crossed with invisible printing ink just prints and can obtain required image at last.
When extracting watermark, at first under ultra violet lamp printed matter is taken pictures, preliminary treatment is carried out normalization to the image after taking then, scan image is converted into the CIELab describing mode again, proposes luminance component wherein; Carry out opposite subtracting property computing at last, obtain a sequence { w
i, set a thresholding M, if w
iGreater than M, think that then what propose is 1, otherwise think propose for-1. promptly obtain watermarking images by anti-Bose-Chaudhuri-Hocquenghem Code.
1.3 parameter optimization
Channel capacity be one be closely connected together key factor of the imperceptibility of watermark robustness and watermark, and the robustness capacity required is many as much as possible, the capacity that imperceptibility then requires to add has a upper limit.Be conflicting between the three.Breadboard Smith of MIT and Comiskey[6] proposed one simply based on the hiding system channel model of the data of rest image from information-theoretical angle, original image is thought an approximately continuous two dimension band limit passage, and have bigger average noise energy, hiding Info is considered to transmission signal by this passage.From this model, be the primary channel model with the Gaussian noise passage, can calculate under the situation of given bandwidth, for reaching the lower limit of the required SNR of channel capacity C.Under the situation of low signal-to-noise ratio, channel capacity is directly proportional with the signal to noise ratio of system.This model limitation is that its hypothesis information superposes in spatial domain.Ramkumar[7] etc. on above model based, improve.Designed in the data that add under the condition of making an uproar and hidden model.Although the estimation about information capacity still has many weak points, for the estimation of capacity provides an extraordinary thinking.PSNR selects 38dB in the image quality evaluation index, and the watermark strength factor alpha is selected under 0.2 the situation, for 1
*256 gray level image can add at most about 1000.2: the invisible printing ink printing technology
Adopt the invisible printing ink print pictures.The characteristic of invisible printing ink is under visible light, and human eye be can not see the picture of invisible printing ink printing, and invisible printing ink presents predetermined color under the specific light source irradiation, and as seen human eye uses the picture of this kind ink printing.Because under visible light, picture is invisible, use plain scan instrument or duplicator to duplicate, this technical method can be used for resisting the possibility that original document is replicated, forges.
In addition, in conjunction with this technology, invisible printing ink is printed on fine rule draws on the shading and can more strengthen anti-replication capacity.Thereby since exist with picture under specific light source irradiation, use the mode of taking pictures obtain pictorial information and forge may, we are printed on fine rule with picture and draw on the shading, be forced to when the adulterator takes and shading can be obtained in the lump together with pictorial information, and being drawn shading, fine rule from picture, removes very difficulty, and fine rule is drawn accurate shading itself and is produced and generated by professional software in printed matter anti-counterfeiting, has antiforge function.The adulterator combines with picture after needing puppet to produce this shading again, if shading is not removed in the pictures taken, forge in the picture shading of shading with it below fail to coincide consistent, hundred-percent identical be very difficult, thereby can judge that just this document is the result that secondary duplicates.Draw on the accurate shading so invisible printing ink is printed on fine rule, can strengthen anti-replication capacity, make and take reduction printing possibility hardly.3: in conjunction with the method for anti-counterfeit of digital watermark technology and invisible printing ink printing technology
This method combines by digital watermark technology and traditional printing technology exactly and carries out printed matter anti-counterfeiting.For the image that will be implied printing, such as logo, head portrait etc., advanced line number word watermark processing embeds some default information, and the information after handling with the invisible printing ink printing technology then is printed onto on the printed matter.During genuine/counterfeit discriminating, at first under specific optical arrangement, rebuild implicit printing image, then it is carried out watermark detection with video camera or scanner.If the information of detected information and embedding is identical or close, be judged to true; Otherwise, be puppet.
Contain digital watermarking picture printed matter, because this picture combines with original shading anti-counterfeiting technology of printed matter and invisible printing ink anti-counterfeiting technology, can promote the application of digital watermark technology greatly, digital watermark technology is combined with the traditional printing anti-counterfeiting technology, more effectively play antiforge function.
Description of drawings:
Fig. 1 is a printed matter anti-counterfeiting manufacturing process block diagram.
Fig. 2 is a printed matter genuine/counterfeit discriminating process block diagram.
Fig. 3～Fig. 5 be respectively original image luminance component, contain watermarking images and watermark.
Fig. 6～Fig. 7 is respectively reconstructed image and detected watermark.
Embodiment:
Fig. 1 and Fig. 2 have provided printed matter anti-counterfeiting manufacturing process respectively and have differentiated the principle schematic of process.Fig. 3 is the luminance component of original image, and Fig. 4 is a watermarking images, and Fig. 5 is watermark (watermark is not in fact required, and watermark can be an image, also can be other any multi-medium datas such as text, Serial No., password).For the purpose of the convenience that shows, do not have to show by the actual size of each image.In the process of differentiating, need to judge the similarity degree of Fig. 5 and Fig. 7, if close this is genuine piece, otherwise, then think counterfeit.
Claims (4)
1. the method for anti-counterfeit in conjunction with digital watermark technology and traditional invisible printing ink printing technology is characterized in that the complementation by two kinds of technology, strengthens the validity of printed matter anti-counterfeiting.
2. printed matter manufacturing process according to claim 1 earlier through digital watermark processing, is printed onto the image for the treatment of implicit printing in the printed matter handling the back image with invisible printing ink then.
3. the printing technology that invisible printing ink printing and shading printing are combined according to claim 1.
4. special color shading printing according to claim 1, its characteristics are a little less than imaging under the fluorescence irradiation.
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| CN 01135023 CN1369376A (en) | 2001-11-15 | 2001-11-15 | Antifraud method for printed matter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387439C (en) * | 2004-08-11 | 2008-05-14 | 富士施乐株式会社 | Print controlling apparatus, method, and storage medium |
| CN102161283A (en) * | 2010-12-28 | 2011-08-24 | 天津环球磁卡股份有限公司 | Anti-counterfeiting method of light interference |
| CN102248825A (en) * | 2004-10-15 | 2011-11-23 | 吉田健治 | Printing methods of dot pattern and medium surface as well as printed matters |
| CN102663373A (en) * | 2012-04-26 | 2012-09-12 | 南京信息工程大学 | Paper medium information safety processing method based on long afterglow material |
| CN109242749A (en) * | 2018-08-09 | 2019-01-18 | 北京交通大学 | The blind digital image watermarking method resisting printing and retaking |
| CN110512465A (en) * | 2019-08-28 | 2019-11-29 | 泰中特种纸有限公司 | A kind of method that quantum dot assistant depositing prepares colored anti-counterfei waterprint paper |
| CN111598763A (en) * | 2020-04-28 | 2020-08-28 | 南京新智客信息科技有限公司 | Secret mark watermark extraction method and system based on mobile phone and image enhancement |
-
2001
- 2001-11-15 CN CN 01135023 patent/CN1369376A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387439C (en) * | 2004-08-11 | 2008-05-14 | 富士施乐株式会社 | Print controlling apparatus, method, and storage medium |
| CN102248825A (en) * | 2004-10-15 | 2011-11-23 | 吉田健治 | Printing methods of dot pattern and medium surface as well as printed matters |
| CN102248825B (en) * | 2004-10-15 | 2014-10-22 | 吉田健治 | Printing methods of dot pattern and medium surface as well as printed matters |
| CN102161283A (en) * | 2010-12-28 | 2011-08-24 | 天津环球磁卡股份有限公司 | Anti-counterfeiting method of light interference |
| CN102663373A (en) * | 2012-04-26 | 2012-09-12 | 南京信息工程大学 | Paper medium information safety processing method based on long afterglow material |
| CN109242749A (en) * | 2018-08-09 | 2019-01-18 | 北京交通大学 | The blind digital image watermarking method resisting printing and retaking |
| CN110512465A (en) * | 2019-08-28 | 2019-11-29 | 泰中特种纸有限公司 | A kind of method that quantum dot assistant depositing prepares colored anti-counterfei waterprint paper |
| CN111598763A (en) * | 2020-04-28 | 2020-08-28 | 南京新智客信息科技有限公司 | Secret mark watermark extraction method and system based on mobile phone and image enhancement |
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