CN101097504A - Method for embedding information on upper printed medium - Google Patents
Method for embedding information on upper printed medium Download PDFInfo
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- CN101097504A CN101097504A CNA2006100144681A CN200610014468A CN101097504A CN 101097504 A CN101097504 A CN 101097504A CN A2006100144681 A CNA2006100144681 A CN A2006100144681A CN 200610014468 A CN200610014468 A CN 200610014468A CN 101097504 A CN101097504 A CN 101097504A
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Abstract
The invention belongs to a method of burying information in printed medium in fields of information process: multiple-image form including character, image, and graph, multiple-pixel form including mesh-type, myriad line-type, error pervasion-type and at least one types of mixed black and white or colorful image with multiple gray scale values are buried, it also includes information burying of mixed image in additional mode and said any image mode. The method possesses characters that quantity of information is big, precision of identification is high and breakage of original image is little, and net screen coding embedding and net screen coding identifier are added into printed medium information processor, it possesses function that information floating word, secret file can be prevented to be copied, information chasing, certificate can be prevented to be sophisticated and file secret-writing and secret-sending, it provides technique auspice for file copying illegally, forgery, tampering induced by popularization of equipment.
Description
Technical field
The invention belongs to field of information processing, especially a kind of method of on print media, imbedding computerized information.
Background technology
In recent years, along with being extensive use of of print media messaging device (as equipment such as printer, duplicating machine and integral machines), utilize the said equipment to obtain very fast development accordingly at printed images on the print media or the technology of in image background, imbedding computerized information, people imbed the function that technology can be implemented in the storage of the enterprising line data of print media by this information, and are widely used on the field such as false proof, anti-tamper to the print media file.Existing information is imbedded method and is mainly contained:
1. the information that will imbed is arranged in a series of little arrays to form digital watermarking image, and this digital watermarking image is imbedded with the original information i.e. realization information that directly superposes; Simultaneously, in order to improve the attack protection performance, need imbed repeatedly same information.This imbed method exist imbed that quantity of information is little, resolution is low, to the destructive problem such as big of original information quality.
2. the information that will imbed is represented message code " 1 " or " 0 " with the difference of forms such as the shape of certain geometric shape such as pixel, position, size, adopt to original information directly the method information of carrying out of stack imbed.This imbed method exist equally imbed that quantity of information is little, resolution is low, to the destructive problem such as big of original information quality.
3. the information that will imbed is represented information coding " 1 " or " 0 " with the pixel of the geometric shape of certain shape, position, size, and imbeds with the fine difference information of carrying out that adopts the big or small pixel of difference at gray scales different in the image.Thisly imbed the characteristic that method is not considered each pixel of image, can not carry out the multiple image format information of carrying out and imbed, and because its site change in displacement is very small, the identification difficulty is bigger; In order to improve discrimination, also need set up reference point in addition, thereby this method is imbedded, and quantity of information is little, resolution is low at the two ends of pixel.
Above-mentioned various information is imbedded method and is all existed and can only imbed at a kind of image format information of carrying out, majority can only be at additional background on character image, utilize this additional background information of carrying out to imbed, image after the information of imbedding is changed, simultaneously, increased the use amount of printing consumable material.Therefore, implanting needle is restricted in the application imbedded of the information of carrying out on to print media in the business automation equipment in future.Particularly present, the print media messaging device is being hidden Info on the print media, preventing to duplicate, failing to propose solution effectively on the problems such as anti-tamper, secret writing, encryption and close biography.
Summary of the invention
The objective of the invention is to propose a kind of method that on print media, can imbed at vision-mix form and the mixed pixel form information of carrying out, this method have imbed contain much information, accuracy of identification is high and to the destructive little characteristics of original information quality, and can effectively solve printed text simultaneously in the use of print media messaging device and be subjected to bootlegging, problem such as forge, distort.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of method of imbedding information on print media is characterized in that: carry out in screen coding embedded device in the information of being imbedded on the print media, its method of imbedding information is:
(1) reads the information data that to imbed;
(2) read the content that will print comprise literal, image, figure the mixing with multiple color and multiple image format original digital image data and carry out CMYK four looks and divide version;
(3) respectively to taking out the pixel of the various ways that comprises site type, ten thousand line styles, error diffusion type in four original digital image datas after minute version one by one, comprise the analysis of the pixel form of pixel form and gray-scale value;
(4) basis is transformed into the half-tone screen code with same pixel form to the pixel morphological analysis result of the pixel of various ways with the information data that will imbed that reads;
(5) after the pixel morphological analysis to many gray-scale values, the constant principle of pixel form that original image press in above-mentioned each site with the half-tone screen code that generates with the pixel form is replaced each pixel of original image, the imbedding of realization half-tone screen code;
(6) will carry out image after screen coding embedded sends print engine to and prints;
It is that more than one multiple color and the original digital image data of the many image formats information of carrying out vision-mix at comprising literal, image, figure is imbedded that above-mentioned information is imbedded, also can be at imbedding together with the information that more than one the original digital image data of many image formats that comprises literal, image, figure carries out vision-mix with additional background again.
And the vision-mix information of described many image formats, many pixels form and many gray-scale values is imbedded the pixel form that comprises pixel form and gray-scale value that method depends on each pixel of original digital image data on the print media.
And when imbedding information in each pixel of the original image of multiple image format, one of half-tone screen code form of the composition can be used the corresponding geometry form of the pixel form that comprises pixel form and gray-scale value with this pixel, also can use the physics form.
And when imbedding information in each pixel of the original image of multiple image format, another form that half-tone screen code constitutes can be used with the corresponding concentrated site of the pixel form that comprises pixel form and gray-scale value of this pixel and disperse the site.
And, the site of the half-tone screen code of described geometry form can show as a kind of dot matrix combination that has with the corresponding different shape of pixel form of original image, perhaps can show as a kind of dot matrix combination that has with the corresponding various directions of pixel form of original image.
And, the site of the half-tone screen code of described physics form can refer to that all dot matrix are the AM screen sites of the amplitude modulation form concentrated and to have a site at least be the FM screen site of the frequency modulation form that is scattered here and there, also showing as is more than one sites with color of certain spectral characteristic, also have the dot matrix combination with the corresponding various directions of propagation of pixel form of original image, also distribute with all different dot matrix of arranging by mechanical characteristic that comprise center of gravity with the pixel form of original image is corresponding.
And described half-tone screen code can be made up of the screen site of same grayscale value, also can be made up of the different screen site of the gray-scale value of each site.
And the described information of imbedding can be one or more in data message, floating word information, trace information, certificate certificate content, sound, image, enciphered message and the secret writing information.
And the output terminal of the half-angle transducer in the input end of described screen coding embedded device and the print media messaging device is connected, and the output terminal of screen coding embedded device is connected with the input end of print engine.
And the output terminal of the scanning input unit in the described print media messaging device is connected with the input end of half-tone screen code recognizer, and the output terminal of half-tone screen code recognizer is connected with the input end of copy image processor.
Advantage of the present invention and good effect are:
The method that on print media, can imbed at the black and white or the coloured image information of carrying out of vision-mix form and mixed pixel form and many gray-scale values proposed by the invention, have imbed contain much information, resolution is high and to the destructive little characteristics of original information quality.The print media messaging device of use said method also has the floating word function of information, the classified papers copy-proof function, information trace function, and the certificate documents content all can be imbedded the anti-tamper function of certificate documents on the print media, and the close energy of passing on Gong of classified papers secret writing of classified papers being encrypted also secret writing printing, and carry out the management function of reader and reading time at the classified papers behind the secret writing, can solve various print media messaging devices well (as printer, equipment such as duplicating machine and integral machine) the file bootlegging that causes because of self development, forge, the social concern of distorting etc.
Description of drawings
Fig. 1 is the diagram of the relevant AM screen site of the present invention, FM screen site, error diffusion type screen site and ten thousand line style screen sites;
Fig. 2 is the diagram of concentrating the site, disperseing the site;
Fig. 3 is the pattern that comprises image, figure, literal vision-mix;
Fig. 4 is the pattern that comprises site type, ten thousand line styles and error diffusion type mixed pixel;
Fig. 5 is that gray-scale value is 4 to 8 concentrated site and the synoptic diagram that disperses the site;
Fig. 6 is the synoptic diagram that the code of Chinese character " word " is represented with half-tone screen code;
Fig. 7 is the synoptic diagram that the half-tone screen code of hexadecimal code D is represented;
Fig. 8 adopts to concentrate site and the half-tone screen code synoptic diagram that disperses the site to form;
Fig. 9 is that a kind of code length is 8 half-tone screen code synoptic diagram;
Figure 10 is that code length is the code value diagram of 8 bar shaped half-tone screen code;
Figure 11 is the synoptic diagram of the difform geometry screen site with many gray scales of site type;
Figure 12 is the half-tone screen code synoptic diagram of forming by the difform geometry screen site of many gray scales;
Figure 13 is the synoptic diagram of geometry screen site of the different directions with many gray scales of site type;
Figure 14 is the half-tone screen code synoptic diagram of forming by the geometry screen site of the different directions of many gray scales;
Figure 15 is the synoptic diagram of physics screen site of the different directions of propagation with many gray scales of site type;
Figure 16 is the half-tone screen code synoptic diagram of forming by the physics screen site of the different directions of propagation of many gray scales;
Figure 17 is a kind of synoptic diagram of physics screen site of the color with certain spectral characteristic;
Figure 18 is the half-tone screen code synoptic diagram of forming by a kind of physics screen site with color of certain spectral characteristic;
Figure 19 is the synoptic diagram of the physics screen site of the color of another kind with certain spectral characteristic;
Figure 20 has the half-tone screen code synoptic diagram that the physics screen site of the color of certain spectral characteristic is formed by another kind;
Figure 21 is the synoptic diagram of the physics screen site with certain mechanical characteristic of a kind of site type;
Figure 22 is the half-tone screen code synoptic diagram of forming by a kind of physics screen site with certain mechanical characteristic;
Figure 23 is the screen site synoptic diagram of ten thousand line style pixels;
Figure 24 is the half-tone screen code synoptic diagram of forming by the screen site of ten thousand line style pixels;
Figure 25 is the screen site synoptic diagram of error diffusion type pixel;
Figure 26 is that the information that comprises the background form is imbedded pattern (partial enlarged drawing is arranged);
Figure 27 is that the information that does not comprise the background form is imbedded pattern (partial enlarged drawing is arranged);
Figure 28 is that the information of literal and bianry image is imbedded pattern;
Figure 29 is a process flow diagram of imbedding information approach on print media of the present invention;
Figure 30 is the screen coding embedded part block scheme of print media messaging device;
Figure 31 is the half-tone screen code identification division block scheme of print media messaging device.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described, but embodiment of the present invention is illustrative, rather than determinate.
In Fig. 1, provide the example of amplitude modulation AM screen site, modulating FM screen site, error diffusion screen site and ten thousand wire-mesh screen sites.Fig. 1 (a) is an AM screen site legend, and Fig. 1 (b) is the legend of FM screen site, and Fig. 1 (c) is the legend of error diffusion type screen site, and Fig. 1 (d) is the legend of ten thousand line style screen sites.Wherein 101 is points, i.e. Yin Shua least unit, and the 102nd, be printed on the point of printing ink.So-called pixel is the least unit of composing images, and so-called site is the pairing screen least unit of pixel with the least unit of composing images, and the site is by forming.The AM type screen that provides in Fig. 1 (a) is the gradation of certain pixel of how many presentation videos of quantity of both having put by the size of site, at Fig. 1 (b), (c), (d) the FM type screen that provides in, error diffusion type screen, ten thousand line style screens are the gradations by certain pixel of how many presentation videos of quantity of putting in the size of reticular density both unit area.
Fig. 2 is the example of the employed a kind of site of present embodiment, and what Fig. 2 (a) represented is to concentrate the site, and what Fig. 2 (b) represented is to disperse the site.The so-called site of concentrating is meant that all dot matrix in each site combine, the so-called site that disperses is meant that the dot matrix in the site has at least a point to separate, wherein, code " 1 " can be represented in concentrated site, disperses the site can represent code " 0 ".
The present invention also will concentrate the site to be considered as AM screen site, disperse the site to be considered as FM screen site, site type pixel can also be considered as AM screen site, it is a kind of modified screen site of FM screen site that error diffusion type pixel is considered as, and ten thousand line style pixels are considered as independently a kind of screen site.
Fig. 3 is the example that comprises image, figure, literal vision-mix, image, figure and Word message on this print media, have been comprised simultaneously, this image is the image by the mixed form of CMYK four looks synthetic blend color, wherein 201 sensings is color image information, 202 to point to be the black and white Word message, and 203 what point to is color graphics information.
Comprising the vision-mix of all images form composition of image, figure, literal, can be black and white, also colored.The present invention takes the direct method that image is imbedded to black white image, to coloured image, should be earlier carry out CMYK four looks to the original digital image data that reads in and divide version, can be that the method for the imbedding information of carrying out of above-mentioned black white image is imbedded by monochrome to each look of CMYK then.
Fig. 4 is an example that comprises site type, ten thousand line styles and error diffusion type mixed pixel, and it is that coloured image is carried out the partial enlarged drawing picture that CMYK divides one of them edition that obtains after the version.Site type, ten thousand line styles and three kinds of pixel forms of error diffusion type on this print media, have been comprised simultaneously, wherein 301 sensings is site type pixel region, 302 what point to is ten thousand line style pixel regions, 303 what point to is error diffusion type pixel region, and the right side is respectively the partial enlarged drawing of site type pixel, ten thousand line style pixels and error diffusion type pixel from top to bottom.
Fig. 5 has the concentrated site of different gray-scale values and disperses the site example, what Fig. 5 (a) represented is that gray-scale value is 4 concentrated site, what Fig. 5 (b) represented is that gray-scale value is 4 dispersion site, what Fig. 5 (c) represented is that gray-scale value is 5 concentrated site, what Fig. 5 (d) represented is that gray-scale value is 5 dispersion site, what Fig. 5 (e) represented is that gray-scale value is 6 concentrated site, what Fig. 5 (f) represented is that gray-scale value is 6 dispersion site, what Fig. 5 (g) represented is that gray-scale value is 7 concentrated site, what Fig. 5 (h) represented is that gray-scale value is 7 dispersion site, what Fig. 5 (i) represented is that gray-scale value is 8 concentrated site, and what Fig. 5 (l) represented is that gray-scale value is 8 dispersion site.
Fig. 6 is the synoptic diagram that Chinese character " word " is represented with half-tone screen code, and " word " computer code of Chinese character is D7D6 (sexadecimal), and its half-tone screen code is by the half-tone screen code (a of 4 different gray-scale values, b), (e, f), (i, l) and (c, d) form, and wherein (a, b) gray-scale value of half-tone screen code is 4, (e, f) gray-scale value of half-tone screen code is 6, (i, l) gray-scale value of half-tone screen code is 8, (c, d) gray-scale value of half-tone screen code is 5.
Fig. 7 is the synoptic diagram that the half-tone screen code of computer code value " D " (sexadecimal) is represented, its binary coding is 1101, its each half-tone screen code (c by different gray-scale values, d), (g, h), (a, b) and (e, f) form, and wherein (c, d) gray-scale value of half-tone screen code is 5, (g, h) gray-scale value of half-tone screen code is 7, (a, b) gray-scale value of half-tone screen code is 4, (e, f) gray-scale value of half-tone screen code is 6.
Fig. 8 adopt to concentrate between site and the code that disperses the site composition similar degree at the half-tone screen code synoptic diagram below 1/2nd.The implication of similar degree is exactly the similarity degree between code between so-called code, and the big more representative of its value is similar more, and resolution is low more, discerns difficult more; Otherwise similar degree is more little between code, and resolution is high more, and it is easy more to discern.The screen code of this networking screen coding is G
6, code value is " 6 ", it has adopted concentrated site and having of disperseing that the site forms is 8 bar shaped half-tone screen code with gray-scale value and code length, wherein (a, b) adopting gray-scale value is 4 half-tone screen code; (c, d) the employing gray-scale value is 5 half-tone screen code; (e, f) the employing gray-scale value is 6 half-tone screen code; (g, h) the employing gray-scale value is 7 half-tone screen code; (i, l) the employing gray-scale value is 8 half-tone screen code.
Fig. 9 is 8 screen code G by concentrated site of adopting different gray-scale values and the code length that disperses the site to form
6Synoptic diagram, this half-tone screen code by gray-scale value be 5 (c, d) partly, gray-scale value be 7 (g, h) partly, gray-scale value be 4 (a, b) part and gray-scale value be 6 (e, f) the common code length of forming of part is 8 half-tone screen code, its code is G
6, its value is " 6 ".
Figure 10 is that code length is that similar degree is at the bar shaped half-tone screen code below 1/2nd between 8 code, and its gray-scale value is 4.Code 0 (G
0) to code F (G
F) code value from " 0 " to " F ", wherein " 0 " in the code use to disperse the site to represent, " 1 " in the code is used and is concentrated the site to represent, and can use different gray-scale values to represent as required.By this figure as can be seen, " 0 " in each code is consistent with quantity in " 1 ", that is to say that the dispersion site in each code is consistent with the quantity of concentrated site, therefore do not need under the situation of parity check bit, still can realize parity function, and the function of automatic error correction, reach the effect of information record expeditiously.
Figure 11 is the synoptic diagram of the difform geometry screen site with many gray scales of site type.Wherein Figure 11 (a) is respectively that gray-scale value is the former pixel of 4 to 8 image from top to bottom, Figure 11 (b) is respectively that gray-scale value is the screen site that a kind of shape of usefulness of 4 to 8 is represented from top to bottom, be used for representing code " 1 ", Figure 11 (c) is respectively that gray-scale value is the screen site that 4 to 8 the another kind of shape of usefulness is represented from top to bottom, is used for representing code " 0 ".
Figure 12 be between the code of forming by the difform geometry screen site of many gray scales of site type similar degree at the half-tone screen code synoptic diagram below 1/2nd.The screen code of this networking screen coding is G
6, its code value is " 6 ", wherein each half-tone screen code adopts that difform geometry site forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) adopting gray-scale value is 4 half-tone screen code; (c, d) the employing gray-scale value is 5 half-tone screen code; (e, f) the employing gray-scale value is 6 half-tone screen code; (g, h) the employing gray-scale value is 7 half-tone screen code; (i, j) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 13 is the synoptic diagram of geometry screen site of the different directions with many gray scales of site type.Wherein Figure 13 (a) is respectively that gray-scale value is the former pixel of 2,4,5,6,7,8 image from top to bottom, Figure 13 (b) is respectively that gray-scale value is the screen site of a kind of direction indication of usefulness of 2,4,5,6,7,8 from top to bottom, be used for representing code " 1 ", Figure 13 (c) is respectively that gray-scale value is the screen site of 2,4,5,6,7,8 the another kind of direction indication of usefulness from top to bottom, is used for representing code " 0 ".
Figure 14 is at the half-tone screen code synoptic diagram below 1/2nd by similar degree between the code of the geometry screen site composition of the different directions of many gray scales.The screen code of this networking screen coding is G
6, its code value is " 6 ", wherein each half-tone screen code adopts that the geometry site of different directions forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) adopting gray-scale value is 2 half-tone screen code; (c, d) the employing gray-scale value is 4 half-tone screen code; (e, f) the employing gray-scale value is 5 half-tone screen code; (g, h) the employing gray-scale value is 6 half-tone screen code; (i, j) the employing gray-scale value is 7 half-tone screen code, (k, l) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 15 is the synoptic diagram of physics screen site of the different directions of propagation with many gray scales of site type.Wherein Figure 15 (a) is respectively that gray-scale value is the former pixel of 2,4,5,6,7,8 image from top to bottom, Figure 15 (b) is respectively that gray-scale value is the screen site that a kind of direction of propagation of usefulness of 2,4,5,6,7,8 is represented from top to bottom, be used for representing code " 1 ", Figure 15 (c) is respectively that gray-scale value is the screen site that 2,4,5,6,7,8 the another kind of direction of propagation of usefulness is represented from top to bottom, is used for representing code " 0 ".
Figure 16 is at the half-tone screen code synoptic diagram below 1/2nd by similar degree between the code of the physics screen site composition of the different directions of propagation of many gray scales.The screen code of this networking screen coding is G
6, its code value is " 6 ", wherein each half-tone screen code adopts that the physics site of the different directions of propagation forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) adopting gray-scale value is 2 half-tone screen code; (c, d) the employing gray-scale value is 4 half-tone screen code; (e, f) the employing gray-scale value is 5 half-tone screen code; (g, h) the employing gray-scale value is 6 half-tone screen code; (i, j) the employing gray-scale value is 7 half-tone screen code, (k, l) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 17 is a kind of synoptic diagram of physics screen site of the color with certain spectral characteristic.Wherein Figure 17 (a) is respectively that gray-scale value is certain color pixel of 4 to 8 from top to bottom, Figure 17 (b) is respectively that gray-scale value is 4 to 8 the screen site identical with native color of using from top to bottom, be used for representing code " 1 ", 17 (c) are respectively that gray-scale value is 4 to 8 the screen site of representing with native color and another kind of color combination from top to bottom, expression code " 0 ".Wherein the color of 401 indications is identical with former pixel color, and the color of 402 indications is the another kind of color different with this color.
Figure 18 be between the code of forming by a kind of physics screen site of the color with certain spectral characteristic similar degree at the half-tone screen code synoptic diagram below 1/2nd.The screen code of this networking screen coding is G
6, its code value is " 6 ", wherein each half-tone screen code adopts that the physics screen site of the color of certain spectral characteristic forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) adopting gray-scale value is 4 half-tone screen code; (c, d) the employing gray-scale value is 5 half-tone screen code; (e, f) the employing gray-scale value is 6 half-tone screen code; (g, h) the employing gray-scale value is 7 half-tone screen code; (i, j) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 19 is the synoptic diagram of the physics screen site of the color of another kind with certain spectral characteristic.Wherein Figure 19 (a) is respectively that gray-scale value is 0,4,5,6,7,8 a certain colour element from top to bottom, Figure 19 (b) is respectively that gray-scale value is 0,4,5,6,7,8 the screen site identical with native color from top to bottom, be used for representing code " 1 ", Figure 19 (c) is respectively that gray-scale value is 0,4,5,6,7,8 the screen site of representing with native color and another kind of color combination from top to bottom, expression code " 0 ".Wherein the color of 501 indications is identical with former pixel color, and the color of 502 indications is the pixel of the blank different with former pixel color.This screen site color only is difficult for the color of resolution as data or other naked eyes at pale yellow color both Y domain.
Figure 20 be between the code formed of a kind of physics screen site of the color with certain spectral characteristic similar degree at the half-tone screen code synoptic diagram below 1/2nd.The screen code of this networking screen coding is G
6, its code value is " 6 ", wherein each half-tone screen code adopts that the physics screen site of the color of certain spectral characteristic forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) adopting gray-scale value is 0 half-tone screen code; (c, d) the employing gray-scale value is 4 half-tone screen code; (e, f) the employing gray-scale value is 5 half-tone screen code; (g, h) the employing gray-scale value is 6 half-tone screen code; (i, j) the employing gray-scale value is 7 half-tone screen code; (k, l) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 21 is the synoptic diagram of the different physics screen site of a kind of center of gravity that distributes with dot matrix with certain mechanical characteristic.Wherein Figure 21 (a) is respectively that gray-scale value is the former pixel of 4,5,6,7,8 image from top to bottom, the gray-scale value of the corresponding former pixel of Figure 21 (b), also be respectively the screen site that a kind of center of gravity of usefulness of 4,5,6,7,8 is represented in the lower right from top to bottom, be used for representing code " 1 ", Figure 21 (c) is respectively that gray-scale value is the screen site that 4,5,6,7,8 the another kind of center of gravity of usefulness is represented on the upper left side from top to bottom, is used for representing code " 0 ".Here an example that just provides with the method for center of gravity, so long as with dot matrix according to the different distribution that any mechanical characteristic carries out, all can be configured to half-tone screen code.
Figure 22 be between the code formed of a kind of different physics screen site of the center of gravity that distributes with dot matrix with certain mechanical characteristic similar degree at the half-tone screen code synoptic diagram below 1/2nd.The screen code of this networking screen coding is G6, its code value is " 6 ", wherein each half-tone screen code adopts that the different physics screen site of the center of gravity that distributes with dot matrix of certain mechanical characteristic forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, wherein (a, b) the employing gray-scale value is 4 half-tone screen code; (c, d) the employing gray-scale value is 5 half-tone screen code; (e, f) the employing gray-scale value is 6 half-tone screen code; (g, h) the employing gray-scale value is 7 half-tone screen code; (i, j) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Above-mentioned is the some kinds of listed examples according to the half-tone screen code of the formed dot matrix distribution of the physical characteristic that comprises geometry formation of example with site type pixel, not only just these are several, and all can comprise in the present invention according to the formed method that distributes of dot matrix that can recorded information of the physical characteristic that comprises geometry.Simultaneously, be not only the formation that site type pixel can realize above-mentioned half-tone screen code, comprise site type pixel, ten thousand line style pixels, error diffusion type pixel all can be imbedded according to the method information of carrying out of above-mentioned half-tone screen code in all interior pixel forms, all belongs in the scope of the present invention.
Figure 23 is the screen site synoptic diagram that constitutes at ten thousand line style pixels.Figure 23 (a) be listed all be a kind of ten thousand line style pixels, Figure 23 (b) is the site example at the half-tone screen code of the designed expression code " 1 " of ten thousand line style pixels, and Figure 23 (c) is the site example at the half-tone screen code of the designed expression code " 0 " of ten thousand line style pixels.This pixel can use the screen site of geometrical property or physics characteristic to represent, for example: the first row (a, b) concentrated site in and dispersion site are represented code " 1 " and " 0 " respectively, the 2nd row (c, d) the difform site in is represented code " 1 " and " 0 " respectively, the 3rd row (e, the site of the different directions f) is represented code " 1 " and " 0 " respectively, the 4th row (g, the site of the different directions of propagation h) is represented code " 1 " and " 0 " respectively, (i, j) site of the different colours in is represented code " 1 " and " 0 " respectively to the 5th row.Wherein 601 is the identical colors of a kind of and former pixel, the 602nd, the color different with former pixel, and the 6th the row (k, l) site of the center of gravity of the bottom right in and upper left center of gravity is represented code " 1 " and " 0 " respectively.
Above-mentionedly several examples have only been enumerated according to the formed dot matrix of the physical characteristic that the comprises geometry half-tone screen codes that constitute that distribute at ten thousand line style pixels designed 6 kinds, not only just these are several, and all belong in the scope of the present invention according to the formed method that distributes of dot matrix that can recorded information of the physical characteristic that comprises geometry.
Figure 24 be between the code formed of the screen site that constitutes at ten thousand line style pixels similar degree at the half-tone screen code synoptic diagram below 1/2nd.The screen code of this half-tone screen code is G6, its code value is " 6 ", wherein each half-tone screen code adopts that the screen site that constitutes at ten thousand line style pixels forms has with gray-scale value and code length is 8 bar shaped half-tone screen code, and wherein (a, b) adopting gray-scale value is 8 half-tone screen code; (c, d) the employing gray-scale value is 11 half-tone screen code; (e, f) the employing gray-scale value is 12 half-tone screen code; (g, h) the employing gray-scale value is 14 half-tone screen code; (i, j) the employing gray-scale value is 16 half-tone screen code; (k, l) the employing gray-scale value is 8 half-tone screen code.Here just provided an example, in actual applications, according to above-mentioned method, the gray-scale value of interior each site of half-tone screen code can be different.
Figure 25 is the screen site synoptic diagram of error diffusion type pixel, Figure 25 (a) be listed all be a kind of error diffusion type pixel, site among Figure 25 (b) is that " 0 " is represented in the site among Figure 25 (c) at the example of the site of the half-tone screen code of the designed expression " 1 " of error diffusion type pixel.This pixel can use geometry or physical screen site to represent, for example: the first row (a, b) concentrated site in and dispersion site are represented code " 1 " and " 0 " respectively, the 2nd row (c, d) the difform site in is represented code " 1 " and " 0 " respectively, the 3rd row (e, the site of the different directions f) is represented code " 1 " and " 0 " respectively, the 4th row (g, the site of the different directions of propagation h) is represented code " 1 " and " 0 " respectively, (i, the site of different colours j) is represented code " 1 " and " 0 " respectively in the 5th row.Wherein 701 is the identical colors of a kind of and former pixel, the 702nd, the color different with former pixel, and the 6th the row (k, l) site of the center of gravity of the bottom right in and upper left center of gravity is represented code " 1 " and " 0 " respectively.
Above-mentionedly several examples have only been enumerated according to the formed dot matrix of the physical characteristic that the comprises geometry half-tone screen codes that constitute that distribute at error diffusion type pixel designed 6 kinds, not only just these are several, and all belong in the scope of the present invention according to the formed method that distributes of dot matrix that can recorded information of the physical characteristic that comprises geometry.
Under the constant situation of the printing quality that guarantees the original image of print content on the print media, the vision-mix information of many image formats, many pixels form and many gray-scale values is imbedded the pixel form that comprises pixel form and gray-scale value that method depends on each pixel of original digital image data on the print media.One of half-tone screen code form of the composition can be used the corresponding geometry form of the pixel form that comprises pixel form and gray-scale value with this pixel, also can use the physics form; Another form that half-tone screen code constitutes can be used corresponding concentrated site of the pixel form that comprises pixel form and gray-scale value and the dispersion site with this pixel.Geometric site comprises the site of difform site and different sizes; Physical site comprises the AM screen site of different amplitude modulation forms and the FM screen site of frequency modulation form, the site of the different directions of propagation, have certain spectral characteristic color the site and have the site of certain mechanical characteristic.
Present embodiment is that the gray-scale value that above-mentioned coded system is formed is 2,4,5,6,7,8, code length is the 8 bar shaped half-tone screen codes that constituted, but, it is a kind of to be not limited only to this, can all can realize the bar shaped half-tone screen code so long as have above multi-form site, gray-scale value and code length according to above-mentioned rule.
The present invention has two kinds to imbed method when information is imbedded:
1. on print media, will comprise additional background, literal, image, figure is at many image formats of more than one interior images, and to comprise the site type, ten thousand line styles, the error diffusion type is in many pixels form of interior more than one, and the information of vision-mix that comprises many gray-scale values of more than one gray shade scales is imbedded, that promptly prints on print media comprises literal, figure and image are in the space of all interior print contents, added a background for imbedding information in a large number, on all the elements of the printing that comprises additional background, imbed the method for information simultaneously, be characterized in imbedding and contain much information.Be that a width of cloth comprises that background, literal, image, figure imbed design sketch at internal information as shown in figure 26, wherein: the left side partial enlarged drawing is the image state of the information imbedded in character area (801), right upper portion is for imbedding the partial enlarged drawing of information in image-region (802), right side central is for imbedding the partial enlarged drawing of information in background area (803), lower right side is for imbedding the partial enlarged drawing of information in graphics field (804).On this a piece of paper, various forms of images are not only arranged, also have the pixel of various forms of images, also have the gray scale of various image.
2. under the situation of the surface quality that does not change print content, make naked eyes not see the situation of the information of imbedding, also can the additional background form will do not comprised, only literal, image, figure are imbedded method in the information of the vision-mix of many image formats of more than one interior images, promptly directly on all print contents of the literal on the print media, figure and image, imbed the method for information simultaneously, be characterized in that former printed images does not change because of imbedding information, printing effect is good.Be that a width of cloth comprises that literal, image, figure imbed design sketch at internal information as shown in figure 27, wherein: the left side partial enlarged drawing is for imbedding the image state of information in character area (901), right upper portion is for imbedding the partial enlarged drawing of information in image-region (902), right side central is the partial enlarged drawing of background, under this embedded mode, the blank space that background is promptly printed is not imbedded information in (903), and lower right side is for imbedding the partial enlarged drawing of information in graphics field (904).
The literal information of carrying out is imbedded effect as shown in figure 28: to the character image as bianry image, the method that half-tone screen code information is imbedded is; Can on a road (1001), open a hole (1002) and in the hole, add some little points, so that naked eyes do not see the duck eye that is opened on a road as shown in figure 28.The present embodiment can be located (1001) represent message code " 1 ", and (1002) are located to represent message code " 0 ".
Imbedding method flow diagram below in conjunction with the information of Figure 29 describes imbedding method:
The above-mentioned method step of imbedding information is as follows:
(1) system begins, and carries out initialization operation (S1).
(2) system reads the information data that will imbed and deposits (S2) in the internal memory in;
(3) system reads the literal that comprises of the content that will print, image, and figure is at the original digital image data of the interior mixing with multiple image format and deposit (S3) in the internal memory in;
(4) from original digital image data, take out one by one and comprise the site type, ten thousand line styles, the error diffusion type comprises the pixel morphological analysis of pixel form and gray-scale value in the pixel of interior various ways, obtains the analysis result of pixel form and the analysis result of gray-scale value (S4);
(5) do you judge that embedded mode comprises imbed (S5) of additional background mode? be then to enter step (S6), otherwise enter step (S7);
(6) judge whether (L is the number near the point under the unit area of white gray to grey scale pixel value K less than L, here establish L=4) (S6)? be to represent that then this position is that the gap of image was both imbedded for the information that can carry out the additional background form, promptly changes over to by background medium and imbeds information (S8): otherwise enter step (S9);
(7) judge whether (L is the number near the point under the unit area of white gray to grey scale pixel value K less than L, here establish L=4) (S7)? be that then its pixel to be judged as be the pixel of a blank, because of what do not need to imbed with the additional background form information of carrying out, therefore this pixel information of carrying out is not imbedded, and directly enter step (S12), otherwise enter step (S9);
(8) from internal memory, read the information data that to imbed, and imbed by the form information of carrying out of additional background, be that " 0 " or " 1 " is transformed into the half-tone screen code of pairing background form promptly according to the information of will imbedding, and be attached in this blank pixel of original image, forming additional background, and deposit (S8) in the internal memory in;
(9) do you judge that grey scale pixel value K is more than or equal to L and smaller or equal to H (S9)? (here, judge whether K is not that blank is promptly more than or equal to L, be not complete black promptly smaller or equal to H yet, L is the number near the point under the unit area of white gray, here establish L=4, H is the number near the point under the holomelanocratic unit area, here establish H=15, that is to say and judge whether K is the pixel that has gray scale), it is then to carry out imbedding (S10): the constant principle replacement original image pixel of pixel form that will press original image with each site of the half-tone screen code that generates with gray-scale value with gray scale, otherwise enter step (S11), carry out the information of full gray scale and imbed processing;
(10) from internal memory, read the information data that to imbed, and this pixel comprised the site type, ten thousand line styles, the error diffusion type is analyzed in all interior pixel forms, also to analyze simultaneously the gray-scale value of this pixel, analysis result according to the pixel form that comprises pixel form and grey scale pixel value, be that " 0 " or " 1 " is transformed into the half-tone screen code with the pixel homomorphosis of this pixel according to the information of will imbedding again, and replace this pixel with this half-tone screen code, the new image of information has been imbedded in formation, and deposits (S10) in the internal memory in;
(11) carrying out full gray scale imbeds: read the information data that will imbed from internal memory, and imbed by the form information of carrying out that full gray scale is imbedded, be that " 0 " still " 1 " is transformed into the half-tone screen code that pairing completely gray scale is imbedded form promptly according to the information of will imbedding, and replace this pixel with this half-tone screen code, the new image of information has been imbedded in formation, and deposits (S11) in the internal memory in;
(12) all pixels of judging original image whether all processing finish (S12)? be then to enter step (13), otherwise rebound step (S4), carry out the processing procedure of step (S4) repeatedly, till the whole processing of all pixels of original image finish to step (S12);
(13) image after will all handling, i.e. the information that will imbed that reads of step (S2) all is embedded in the original image that step (S3) reads and goes, and promptly forms a new image.This image is finally deposited in the internal memory, and sends print engine to, prints output.
(14) information is imbedded the processing end.
Above-mentioned when the various pixel form information of carrying out are imbedded, half-tone screen code can use with the corresponding many gray scales of the pixel form of this pixel concentrates site and many gray scales to disperse the site, also can use the corresponding many gray scales AM of pixel form screen site and FM screen site with this pixel.
Above-mentioned half-tone screen code is in a half-tone screen code, its half-tone screen code can be made up of the screen site with gray-scale value, promptly the gray-scale value of the screen site in half-tone screen code is the same, and the gray-scale value of each the screen site in a half-tone screen code as shown in Figure 8 is the same.
According to the different variation of form of the pixel of original image, a half-tone screen code can also be made up of the screen site of different gray-scale values, and promptly this half-tone screen code can be that the screen site of different gray-scale values is formed, as shown in Figure 9.
The content of the information of imbedding can be one or more in data message, floating word information, trace information, certificate certificate content, sound, image, enciphered message and the secret writing information.
Above-mentioned process flow diagram is primarily aimed at that the monochrome image information of carrying out imbeds, under the situation of coloured image, need that coloured image is carried out CMYK four looks and divide version, to the C version, the M version, the processing that the flow process information of carrying out that Y version and K version are imbedded by above-mentioned monochrome image information is respectively imbedded, and then CMYK four editions is incorporated into together printing output just can obtains effect that the information of coloured image is imbedded.
The method that the form information of carrying out by additional background that relates in the above-mentioned process flow diagram is imbedded, be meant (a) that be similar to Fig. 5 and (b) two kinds of sites can be used as the screen site of imbedding by the form information of carrying out of additional background.But not only this is a kind of, adopts the multi-form site of two kinds of lower same grayscale values of gray-scale value all to can be used as the screen site of imbedding by the form information of carrying out of additional background.
The method that the form information of imbedding by full gray scale of carrying out that relates in the above-mentioned process flow diagram is imbedded, be meant that to be similar to Figure 28 such, the method of imbedding as the information of the lteral data of bianry image, be equally applicable to the pixel information of carrying out of full gray scale form is imbedded, though, mentioning this figure in front is to imbed at the information of character image, the present embodiment is the method that a kind of information is imbedded with character image with the full gray-scale pixels of image, therefore, can satisfy the requirement that the information of multiple image format is imbedded.
Be the screen coding embedded part block scheme of print media messaging device as shown in figure 30, the least significant end of the printout part of existing print media messaging device is the half-angle transducer and directly is connected with print engine, the present invention adds the screen coding embedded device that the information of being built-in with is imbedded disposal system between half-angle transducer and print engine, the output terminal of the half-angle transducer in the input end of screen coding embedded device and the print media messaging device is connected, the output terminal of screen coding embedded device is connected with the input end of print engine, screen coding embedded system imbeds the view data information of carrying out that transmits from the half-angle transducer, and the image information after will imbedding outputs on the print media by print engine.
Be the half-tone screen code identification division block scheme of print media messaging device as shown in figure 31, the scanning input unit that is foremost of the scanning identification division of existing print media messaging device directly is connected with the copy image processor, the present invention increases by a half-tone screen code recognizer between scanning input unit and copy image processor, the input end that is the half-tone screen code recognizer is connected with the output terminal of scanning input unit, the output terminal of half-tone screen code recognizer is connected with the input end of copy image processor, the scanning input unit can and be converted to view data with print media file scan input and send the half-tone screen code recognizer to, the half-tone screen code recognizer is discerned the half-tone screen code in the view data, check whether there is half-tone screen code, and half-tone screen code information understood, the half-tone screen code that identifies is then duplicated accordingly forbid handling, the floating word processing of information, the classified papers anti-copy is handled, the information trace is handled, anti-tamper processing of certificate documents and classified papers carry out the reader, the management of reading time etc.
In fact, screen coding embedded device can be joined in a manner described in the circuit of print media messaging devices such as printer, duplicating machine, integrated, facsimile recorder, can realize that all the information of this programme is imbedded method; The half-tone screen code recognizer can also be joined duplicating machine in a manner described, integral machine, scanner, in the circuit of print media messaging devices such as printing machine, half-tone screen code in the view data is discerned, check whether there is half-tone screen code, and half-tone screen code information understood, the half-tone screen code that identifies then duplicated accordingly forbid handling, the floating word processing of information, the classified papers anti-copy is handled, the information trace is handled, anti-tamper processing of certificate documents and classified papers carry out the reader, the management of reading time etc., and can solve the file bootlegging that the said equipment causes owing to self-growth, forge, social concern such as distort.
Claims (10)
1. method of on print media, imbedding information, it is characterized in that: carry out in screen coding embedded device in the information of being imbedded on the print media, its method of imbedding information is:
(1) reads the information data that to imbed;
(2) read the content that will print comprise literal, image, figure the mixing with multiple color and multiple image format original digital image data and carry out CMYK four looks and divide version;
(3) respectively to taking out the pixel of the various ways that comprises site type, ten thousand line styles, error diffusion type in four original digital image datas after minute version one by one, comprise the analysis of the pixel form of pixel form and gray-scale value;
(4) basis is transformed into the half-tone screen code with same pixel form to the pixel morphological analysis result of the pixel of various ways with the information data that will imbed that reads;
(5) after the pixel morphological analysis to many gray-scale values, the constant principle of pixel form that original image press in above-mentioned each site with the half-tone screen code that generates with the pixel form is replaced each pixel of original image, the imbedding of realization half-tone screen code;
(6) will carry out image after screen coding embedded sends print engine to and prints;
It is that more than one multiple color and the original digital image data of the many image formats information of carrying out vision-mix at comprising literal, image, figure is imbedded that above-mentioned information is imbedded, also can be at imbedding together with the information that more than one the original digital image data of many image formats that comprises literal, image, figure carries out vision-mix with additional background again.
2. the method for imbedding information on print media according to claim 1 is characterized in that: the vision-mix information of described many image formats, many pixels form and many gray-scale values is imbedded the pixel form that comprises pixel form and gray-scale value that method depends on each pixel of original digital image data on the print media.
3. the method for on print media, imbedding information according to claim 2, it is characterized in that: when in each pixel of the original image of multiple image format, imbedding information, one of half-tone screen code form of the composition can be used the corresponding geometry form of the pixel form that comprises pixel form and gray-scale value with this pixel, also can use the physics form.
4. the method for on print media, imbedding information according to claim 2, it is characterized in that: when imbedding information in each pixel of the original image of multiple image format, another form that half-tone screen code constitutes can be used with the corresponding concentrated site of the pixel form that comprises pixel form and gray-scale value of this pixel and disperse the site.
5. the method for on print media, imbedding information according to claim 3, it is characterized in that: the site of the half-tone screen code of described geometry form can show as a kind of dot matrix combination that has with the corresponding different shape of pixel form of original image, perhaps can show as a kind of dot matrix combination that has with the corresponding various directions of pixel form of original image.
6. the method for on print media, imbedding information according to claim 3, it is characterized in that: the site of the half-tone screen code of described physics form can refer to that all dot matrix are the AM screen sites of the amplitude modulation form concentrated and to have a site at least be the FM screen site of the frequency modulation form that is scattered here and there, also show as the site of the color that is the certain spectral characteristic of having of more than one, also have the dot matrix combination with the corresponding various directions of propagation of pixel form of original image, also have with the pixel form of original image is corresponding and distribute with all different dot matrix of arranging by mechanical characteristic that comprise center of gravity.
7. the method for imbedding information on print media according to claim 3 is characterized in that: described half-tone screen code can be made up of the screen site of same grayscale value, also can be made up of the different screen site of the gray-scale value of each site.
8. the method for imbedding information on print media according to claim 1 is characterized in that: the described information of imbedding can be one or more in data message, floating word information, trace information, certificate certificate content, sound, image, enciphered message and the secret writing information.
9. the method for on print media, imbedding information according to claim 1, it is characterized in that: the output terminal of the half-angle transducer in the input end of described screen coding embedded device and the print media messaging device is connected, and the output terminal of screen coding embedded device is connected with the input end of print engine.
10. the method for on print media, imbedding information according to claim 9, it is characterized in that: the output terminal of the scanning input unit in the described print media messaging device is connected with the input end of half-tone screen code recognizer, and the output terminal of half-tone screen code recognizer is connected with the input end of copy image processor.
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| CN105205777A (en) * | 2015-08-28 | 2015-12-30 | 深圳市泰久信息***股份有限公司 | Encoding method of invisible image ciphers |
| CN105205777B (en) * | 2015-08-28 | 2019-03-08 | 深圳市泰久信息***股份有限公司 | A kind of coding method of latent image password |
| CN111798532A (en) * | 2020-08-03 | 2020-10-20 | 广州市宝绅科技应用有限公司 | Screen coding method and system based on centroid coincidence |
| CN111798532B (en) * | 2020-08-03 | 2021-03-16 | 广州市宝绅科技应用有限公司 | Screen coding method and system based on centroid coincidence |
| US11508093B2 (en) | 2020-08-03 | 2022-11-22 | Guangzhou Baoshen Science & Applied Technologies Co., Ltd. | Screen coding methods and systems based on mass center coincidence |
| CN112488902A (en) * | 2020-12-21 | 2021-03-12 | 重庆紫光华山智安科技有限公司 | Optimization method, system, medium and terminal for self-adaptive hidden watermark |
| CN112488902B (en) * | 2020-12-21 | 2024-02-06 | 重庆紫光华山智安科技有限公司 | Optimization method, system, medium and terminal for self-adaptive hidden watermark |
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