CN101021940A - Grey scale image embedded information content analysis method - Google Patents
Grey scale image embedded information content analysis method Download PDFInfo
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- CN101021940A CN101021940A CN 200710056867 CN200710056867A CN101021940A CN 101021940 A CN101021940 A CN 101021940A CN 200710056867 CN200710056867 CN 200710056867 CN 200710056867 A CN200710056867 A CN 200710056867A CN 101021940 A CN101021940 A CN 101021940A
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Abstract
This invention relates to a method for embedding information of images based on man-eye visual characters, which can embed information of multiple image modes including letters, images and figures, multiple pixels modes including a collected network point type and a scattered network point type and more than one black and white mixed or colorful images with multiple grey values, which has the characters of large sum of embedded information, small breakage to the original images, accurate identification and fine Rodust.
Description
Technical field
The invention belongs to field of information processing, is a kind of method of the image information of carrying out being imbedded based on human-eye visual characteristic.
Background technology
The human vision principle:
Color information in the Nature is continuous.But the resolution of human eye is limited, and human vision system is non-homogeneous and nonlinear to the susceptibility of picture field.A lot of accurately perception of color detail human eye.
With the gray scale is example, and human eye is very poor to the resolution characteristic of gray scale, generally has only tens gray levels.8 gray level images (be exactly we often say 256 (2
8) the level gray level image) in, if the gray scale of neighbor pixel is more or less the same, but having comprised abundant information, human eye then can't extract corresponding information from image.That is to say that for gray level image, human visual redundancy degree is very high.As shown in Figure 1, the continuous gray-scale value and the contrast of discrete gray-scale value.
The redundancy that human eye has the variation of gradation of image.Along with the increase of brightness, vision system reduces the susceptibility of quantization error.This is because the resolving ability of human eye and the background luminance around the object are inversely proportional to.Explanation thus: at high luminance area, the quantification of gray-scale value can be more coarse.In addition, in the violent place of variation of image grayscale, human eye also can reduce the susceptibility of gray scale.
Human eye is to the insensitive characteristic of bigger variation of extremely among a small circle gradation of image.In general, gray scale approaches 0 more, and it changes is difficultly more perceiveed by the mankind.
Gray level image information Stealth Modus commonly used at present:
At present, the Information Hiding Techniques development is very fast.Its method have living space territory (time domain) and transform domain (frequency domain) Information hiding.
Spatial domain adopts the replacement method more.Least significant bit (LSB) is replaced and the bit plane instrument is the spatial domain hidden method of using always.It is conventionally believed that Roman Machado has proposed the protonotion [Stego website] of LSB coding.For making the carrier file that tangible change not take place, it is the least significant bit that information bit is substituted into carrier element.Another kind of method commonly used is hidden method for statistics, for rest image, statistical nature according to pixel in the image is embedded into information in the brightness value of pixel, as picked at random n pixel (a, b), the brightness value of a increases by 1, and then the brightness of b subtracts 1, keeps the mean flow rate of entire image constant.
An Information hiding system should possess features such as ability such as the transparency, robustness, undetectability, security, self-reparability.Which type of adopts imbed method but no matter spatial-domain information is hidden, up to now, all exist a serious problem always, robustness that hides Info exactly and self-reparability can't obtain big breakthrough.So, Information hiding area research person usually with Information hiding in the domain of variation of original image.Known reliable Information hiding system reality all is used on certain frequency domain now.The hidden method that many transform domains are arranged at present, wherein a kind of method are to use discrete cosine transform (DCT) as means embedding information in image; Also having a kind of wavelet transformation that is to use. conversion can be carried out on entire image, also can carry out the another arena operation to entire image, or other mutation.Yet transform domain information is hidden and also to be existed uncontrollable defective, and that is exactly the contradiction that exists between the information content that can hide in the image and the accessible system robustness.
Method based on human-eye visual characteristic is imbedded the image information of carrying out also has delivering of a large amount of patents and paper.The famous H company of Japan had once delivered and had been entitled as: " digital watermark method that is used for bianry image " (spy opens 2004-289783).This patent proposes to utilize the Gestalt rule in the famous human-eye visual characteristic, to making image produce irregular part because of imbedding information, the discontinuous part of breakpoint is arranged, and the uneven part of the convex-concave of outline portion is repaired, and can make the image quality improvement after information is imbedded.This method is a kind of means that contain the composition that gets sth into one's head qualitatively, can not be strict as a kind of algorithm, and this method does not relate to and utilizes human eye to the unconspicuous visual characteristic of the grey scale change of image.
The patent of the method for the image information of carrying out being imbedded based on human-eye visual characteristic, same Japanese famous H company has delivered recently and has been entitled as: " information flush mounting, the printing medium reach information read device " (spy opens 2006-279640).When this patent proposes again to imbed at the printed images information of carrying out, can on the paper medium medium of the vision that does not influence human eye, the information of carrying out imbed, still not break away from here and will introduce the road that only relies on empirical algorithms based on the theory that the model information of carrying out of human-eye visual characteristic is imbedded.
In the recent period, a kind of new method of imbedding at the printed images information of carrying out has been delivered, a kind of the half-tone screen code control method of a large amount of record data " can on paper ", and (patent publication No.: patent CN1598873) has been disclosed.This method is utilized half-tone screen code, can realize imbedding in a large number of information on the paper medium.The present invention is the new achievement in research on this patent basis.
Summary of the invention
The present invention belongs to a kind of new method of the image information of carrying out being imbedded based on human-eye visual characteristic.This method have imbed contain much information, to destructive little and accuracy of identification is high, robustness the is good characteristics of original image.Can realize the imbedding in a large number of information, in the functions such as classified papers are hidden, information trace and the close biography of file secret writing, can be effective solution and provide technical support by the universal file bootlegging that causes of multimedia equipment, problem such as forge, distort.Compare above-mentioned half-tone screen code control method, the present invention is based on the human eye vision principle, it has been done the improvement of imbedding the information position and the on-plane surface of half-tone screen code form is widened.
The present invention solves its technical matters and takes following scheme to realize:
A kind of method of the image information of carrying out being imbedded based on human-eye visual characteristic is characterized in that:
(1) utilized human eye to the insensitive characteristic of the variation of gradation of image, the means of imbedding at the insensitive one or more gray-scale value scope information of carrying out of human eye in each gray-scale value of the part or all of pixel of composing images;
That (2) has considered human-eye visual characteristic comprises shape with what nonplanar form was represented, size, position and direction are at interior geometrics, and comprise mechanical characteristic with what nonplanar form was represented, frequency characteristic, thermodynamic behaviour is imbedded means in the information of interior physics figure record computerized information;
(3) utilized the redundancy that variation had of human eye to gradation of image, at each grey level of image, determined the minimized of image quality loss, the definite means of the image pixel grey level when information is imbedded of making;
(4) utilized the redundancy that variation had of human eye,, determinedly made the minimized of image quality loss, definite means of the bitmap of can the information of carrying out imbedding at each bitmap of image to gradation of image;
(5) and utilized the redundancy that variation had of human eye to gradation of image, at each grey level of image, determined the minimized of image quality loss, the means of imbedding of the computer code that nonplanar form is represented of making;
(6) utilized the bigger variation insensitive characteristic of human eye,, in image, set up the means of standard grayscale value point at the image of having imbedded information to the gradation of image of extremely little scope;
(7) and utilized the redundancy that variation had of human eye, at each bitmap of image, under the minimized prerequisite of image quality loss, the computer code that nonplanar form is represented is imbedded the means in the image bit map to gradation of image.
This information is imbedded method and has been utilized the redundancy that variation had of human eye to gradation of image, each grey level at image pixel, determinedly make the minimized of image quality loss, the method of imbedding at each pixel information of carrying out of image, be with each gray-scale value of image pixel principle, the gray-scale value of this pixel is changed over the gray-scale value that constitutes certain relation with the gray-scale value of neighbor or official portrait vegetarian refreshments by former gray-value variation minimum.
This information is imbedded method and has been utilized the redundancy that variation had of human eye to gradation of image, each grey level at image, determinedly make the minimized of image quality loss, the form means of the computer code that the form of gray level is represented is that computer code that the form of gray level is represented is in each pixels of a split plane that pluralizes above-mentioned a plurality of gray levels of being embedded in image simultaneously.
This information is imbedded method and has been comprised that based on human-eye visual characteristic human eye is to the insensitive characteristic of the variation of gradation of image, human eye is to the redundancy characteristic that variation had of gradation of image, human eye is to the insensitive characteristic of bigger variation of the gray-scale value of extremely little image range, at the image of having imbedded information, in image, set up the means of standard grayscale value point, be meant in image, comprise the image maximum gradation value by what uniformly-spaced set up, the intermediate gray-scale value, minimum gradation value is at the image processing method of the standard grayscale value of interior more than one.
This information is imbedded method and has been utilized the redundancy that variation had of human eye to gradation of image, different gray-scale values at each pixel of image, determining to make the information of image impairment minimum imbed method, is that the gray scale that needs are imbedded the pixel of information is changed over and original gray-scale value of this pixel immediate that comprise prime number value, ratio value and a neighbor or the relevant gray-scale value of standard grayscale value pixel.
This information is imbedded method and has been utilized the redundancy that variation had of human eye to gradation of image, each bitmap at image, determinedly make the minimized of image quality loss, definite means of the bitmap of can the information of carrying out imbedding are to imbed the computer code information that the form of different gray scales site is represented in the high bitmap of image.
The relative prior art of the present invention has following advantage and effect:
The method of the image information of carrying out being imbedded based on human-eye visual characteristic proposed by the invention can black and white or the coloured image information of carrying out at vision-mix form and mixed pixel form and many gray-scale values be imbedded on gray level image.This method have imbed contain much information, to destructive little and accuracy of identification is high, robustness the is good characteristics of original image.Use said method to can be implemented in imbedding in a large number of hiding Info on the gray level image, and can realize the close biography of secret writing of classified papers, and at the classified papers behind the secret writing read, the management of function such as information trace.Can provide technical support for effectively solving by the universal file bootlegging that causes of multimedia equipment, problem such as forge, distort.
Description of drawings
Fig. 1 is a continuous gray-scales and the visual contrast of being interrupted gray scale (why partitioned representation is the Mach band effect influence for fear of human vision);
Fig. 2 be can be on image the Information hiding system of a large amount of record data;
Fig. 3 is the embodiment of AM site and FM site, (a) example of expression AM (Amplitude Modulation) site, (b) example of expression FM (Frequency-Modulated) site;
Fig. 4 is the embodiment of the site of present embodiment use, (a) example of expression set site, and (b) expression disperses the example of site;
Fig. 5 is the synoptic diagram of relation of the distribution of the gray-scale value of site and site; (a) gray scale is 4, and (b) gray scale is 5, and (c) gray scale is 6, and (d) gray scale is 7, and (e) gray scale is 8.
Fig. 6 comprises geometric configuration with what the gray shade scale form was represented, mechanical characteristic, and frequency characteristic is at the figured site of interior physics synoptic diagram, and is (a) square, circle, the rhombus site, (b) center of gravity is last, center of gravity is being descended, center of gravity site placed in the middle, and (c) site appears at the frequency at center.
But Fig. 7 is the AM site of representative information " 1 " or claims the concentrated site;
But Fig. 8 is the three-dimensional distribution plan in the site of the representative information point " 1 " under the different grey-scale;
But Fig. 9 is the FM site or the decentralized site of representative information point " 0 ";
But Figure 10 is the three-dimensional distribution plan in the site of the representative information point " 0 " under the different grey-scale;
Figure 11 adopts with the information of standard information point formation e multiple to imbed method;
Figure 12 is the example that the method information of carrying out of employing prime number is imbedded;
Figure 13 is the process flow diagram that generates hidden object;
The information of the blindage object images of Figure 14 bitmap form is imbedded method.
Embodiment
In conjunction with embodiment technical scheme is described in detail.But embodiment of the present invention is illustrative, rather than determinate.
Continuous gray-scales and the visual comparsion chart who is interrupted gray scale have been provided among Fig. 1.The 1st, 3 behavior Continuous Gray Scale figure among Fig. 1 wherein, from 0 to 255 gradual change of its gray-scale value.2nd, 4 behaviors are interrupted gray-scale map, and wherein each interval gray-scale value all is identical, and its gray-scale value is respectively 0,20,45,65,90,110,140,165,185,210,230,245.By contrast effect as can be seen, the place that human vision substantially can't be less to its accurate difference, especially gray-scale value (promptly visually feeling dark zone).This figure why partitioned representation is for fear of being interrupted grey scale change in the gray-scale map to the Mach band effect influence of human vision.
Fig. 2 be can be on image the Information hiding system schematic of a large amount of record data.Wherein the blindage object is meant our original image.Embedded object is meant needs hiding information.Stego-key was meant that before information is imbedded (or among) is to its information encryption algorithm that carries out.Embed algorithm and be meant that embedded object embeds the employed algorithm of blindage object.Embedded object generates hidden object after embedding the blindage object.Again recover embedded object by stego-key and decode system during extraction.
Fig. 3 is the embodiment of AM site and FM site, (a) example of expression AM site, (b) example of expression FM site.Wherein, AM is Amplitude Modulation, be a kind of finger in unit area, come the depth shade of grey of represent images with the size of site.FM is frequency-modulated, has been a kind of meshing method that new development is got up since the nineties, and it and amplitude modulation site difference are: the site size of frequency-modulation halftone dot is fixed, and it is that dense degree by network point realizes contrast.The site of high light part is sparse, and the site of shadow part is intensive.
Fig. 4 is the embodiment of the site of present embodiment use, (a) example of expression set site, and (b) expression disperses the example of 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 ".
Fig. 5 is the synoptic diagram of relation of the distribution of the gray-scale value of site and site.Wherein n is a gray level.The gray level colleague has listed six kinds of site examples that gray scales such as (can not be confined to six kinds) substitutes.Determining of image gray levels by Figure 10 explanation.
Fig. 6 comprises geometric configuration with what the gray shade scale form was represented, mechanical characteristic, and frequency characteristic is at the figured site of interior physics synoptic diagram.Wherein, the site of a for representing with geometrics, a1 represents square site, and a2 represents circular shaped lattice point, and a3 represents the rhombus site.B is the site synoptic diagram of representing with mechanical characteristic, and b1 represents center of gravity in last site, b2 represent center of gravity under the site, b3 represents the site that center of gravity is placed in the middle.C is at site synoptic diagram that the frequency characteristic at center is represented with the site.
But Fig. 7 is the AM site or the concentrated site of representative information " 1 ".Wherein, gray level from left to right is followed successively by 4,5,6,7,8.Among the present invention, we can also will concentrate the site to be considered as the AM site.Simultaneously, information " 1 " also can be by the geometric configuration of representing with the gray shade scale form that comprises, mechanical characteristic, and frequency characteristic is in interior physics diagrammatic representation.
But Fig. 8 is the three-dimensional distribution plan in the site of the representative information point " 1 " under the different grey-scale.Wherein, gray level from top to bottom is followed successively by 4,6,8.Among the present invention, we can also will concentrate the site to be considered as the AM site.
But Fig. 9 is the FM site or the decentralized site of representative information point " 0 ".Wherein, gray level from left to right is followed successively by 4,5,6,7,8.Among the present invention, we can also will disperse the site to be considered as the FM site.Simultaneously, information " 0 " also can be by the geometric configuration of representing with the gray shade scale form that comprises, mechanical characteristic, and frequency characteristic is in interior physics diagrammatic representation.
But Figure 10 is the three-dimensional distribution plan in the site of the representative information point " 0 " under the different grey-scale.Wherein, gray level from top to bottom is followed successively by 4,6,8.Among the present invention, we can also will disperse the site to be considered as the FM site.
Figure 11 changes over the gray-scale value that needs are imbedded the pixel of information with the most sub approaching one of original gray-scale value of this pixel to constitute example with the gray-scale value of numerical value e integral multiple with the official portrait vegetarian refreshments.Among the figure, a represents the gray-scale value of official portrait vegetarian refreshments.B represents original gray-scale value of the pixel of the information of will imbedding " 1 ", and c represents the gray-scale value after the information of imbedding " 1 ", promptly with the gray-scale value of the immediate 3 times of e numerical value of former gray-scale value.D represents the gray-scale value after the information of imbedding " 0 ", and being former gray-scale value immediate is not the gray-scale value of the integral multiple of e numerical value.Here, when identifying information " 1 " or " 0 ", can allow the gray-scale value of information " 1 " or " 0 " that certain error range is arranged, but the gray-scale value v of general set information " 1 " is:
ne+o.75e≤v＜ne+0.25e
But the gray-scale value v of same set information " 0 " is:
ne+o.25e≤v＜ne+0.75e
Figure 12 changes over example with the gray-scale value of the most sub approaching prime number of original gray-scale value of this pixel with the gray-scale value that needs are imbedded the pixel of information.Among the figure, a official portrait vegetarian refreshments, the pixel that to be a gray-scale value be the prime number value.B represents original gray-scale value of the pixel of the information of will imbedding " 1 ", and c represents the gray-scale value after the information of imbedding " 1 ", is the gray-scale value of prime number 3.D represents the gray-scale value of prime number 7, and e has represented to imbed the gray-scale value of information " 0 ", promptly is not the gray-scale value of prime number 7.In like manner, when identifying information " 1 " or " 0 ", can allow the gray-scale value of information " 1 " or " 0 " that certain error range is arranged.
Figure 13 is the process flow diagram that generates hidden object:
Step S1 handles embedded object, can implement encryption to embedded object by cryptographic algorithm when being translated into half-tone screen code.
Step S2 is the pre-service of the image of blindage object being carried out aberration etc.
Step S3 analyzes the gray-scale value of a certain pixel of blindage object images, calculates the gray-scale value of this pixel.
In step S3, also carry out the setting work of the pixel of standard grayscale value simultaneously.The establishing method of this standard grayscale value pixel is that the establishing method of the official portrait vegetarian refreshments that provides according to Figure 11 and Figure 12 carries out.The official portrait vegetarian refreshments is to be given and the immediate gray-scale value with certain feature of former gray-scale value with positional information and the pairing gray values of pixel points in this position, its determining method can but be not limited to: the feature gray-scale value that the blindage object is set in certain location.
Step S4 judges whether imbedding of needs information " 1 " according to the numerical value of S1 half-tone screen code, is then to change the S5 step over to, otherwise changes the S6 step over to.
In the S5 step, imbed method according to the information that Figure 11 and Figure 12 provide, this pixel is carried out the processing of imbedding of information " 1 ".
In the S6 step, imbed method according to the information that Figure 11 and Figure 12 provide, this pixel is carried out the processing of imbedding of information " 0 ".
Judge in step S7 whether pixel analysis is all finished, otherwise turn back to the processing of S3 step.It is the processing that then changes the S8 step over to.
In the S8 step, the image of the information of being embedded with is kept in the internal memory.
The processing of Information hiding is all over.
Figure 14 is that the blindage object is the method that the information of the image of bitmap form is imbedded, and among the figure, (a) represents former figure, (b) expression first (minimum) bit plane, (c) expression the 3rd bit plane, (d) expression the 8th (the highest) bit plane, (e) expression site, most significant digit plane alternative schematic.
According to the characteristic of bitmap, half-tone screen code directly can be replaced the content of high bitmap, the purpose of just can realization information imbedding.In this case, the S3 step of the process flow diagram of Figure 13 should be carried out the analysis of high bitmap, judges whether to be the imbedding of information " 1 " in the S4 step, and same, "Yes" is then carried out the processing of S5 step, and "No" is then carried out the processing of S6 step.The processing of S5 step is the state that the pixel of pairing high bitmap is replaced as " 1 " by the form of half-tone screen code.The processing of S6 step is the state that the pixel of pairing high bitmap is replaced as " 0 " by the form of half-tone screen code.The operation of S7 and S8 is the same.
Claims (6)
1, a kind of method of the image information of carrying out being imbedded based on human-eye visual characteristic is characterized in that:
(1) utilized human eye to the insensitive characteristic of the variation of gradation of image, in each gray-scale value at the part or all of pixel of composing images, the means that the insensitive one or more gray-scale value scope information of carrying out of human eye is imbedded;
(2) considered the shape that comprises that the form with gray shade scale of human-eye visual characteristic represents, size, position and direction be at interior geometrics, and comprise mechanical characteristic with what the gray shade scale form was represented, and frequency characteristic is imbedded means in the information of interior physics figure record computerized information;
(3) utilized the redundancy that variation had of human eye to gradation of image, at each grey level of image, determined the minimized of image quality loss, the definite means of the image pixel grey level when information is imbedded of making;
(4) utilized the redundancy that variation had of human eye,, determinedly made the minimized of image quality loss, definite means of the bitmap of can the information of carrying out imbedding at each bitmap of image to gradation of image;
(5) and utilized the redundancy that variation had of human eye to gradation of image, at each grey level of image, determined the minimized of image quality loss, the means of imbedding of the computer code that nonplanar form is represented of making;
(6) utilized the bigger variation insensitive characteristic of human eye,, in image, set up the means of standard grayscale value point at the image of having imbedded information to the gradation of image of extremely little scope;
(7) and utilized the redundancy that variation had of human eye, at each bitmap of image, under the minimized prerequisite of image quality loss, the computer code that different gray scales are represented is imbedded the means in the image bit map to gradation of image.
2, the method for the image information of carrying out being imbedded based on human-eye visual characteristic according to claim 1, it is characterized in that: utilized the redundancy that variation had of human eye gradation of image, each grey level at image pixel, determinedly make the minimized of image quality loss, the method of imbedding at each pixel information of carrying out of image, be with each gray-scale value of image pixel principle, the gray-scale value of this pixel is changed over the gray-scale value that constitutes certain relation with the gray-scale value of neighbor or official portrait vegetarian refreshments by former gray-value variation minimum.
3, according to claim 1, the 2 described methods of the image information of carrying out being imbedded based on human-eye visual characteristic, it is characterized in that: utilized the redundancy that variation had of human eye gradation of image, each grey level at image, determinedly make the minimized of image quality loss, the form means of the computer code that the form of gray level is represented is that computer code that the form of gray level is represented is in each pixels of a split plane that pluralizes above-mentioned a plurality of gray levels of being embedded in image simultaneously.
4, the method of the image information of carrying out being imbedded based on human-eye visual characteristic according to claim 1, it is characterized in that: comprised that based on human-eye visual characteristic human eye is to the insensitive characteristic of the variation of gradation of image, human eye is to the redundancy characteristic that variation had of gradation of image, human eye is to the insensitive characteristic of bigger variation of the gray-scale value of extremely little image range, at the image of having imbedded information, in image, set up the means of standard grayscale value point, be meant in image, comprise the image maximum gradation value by what uniformly-spaced set up, the intermediate gray-scale value, minimum gradation value is at the image processing method of the standard grayscale value of interior more than one.
5, according to claim 1, the 2 described methods of the image information of carrying out being imbedded based on human-eye visual characteristic, it is characterized in that: utilized the redundancy that variation had of human eye gradation of image, different gray-scale values at each pixel of image, determine to make the information of image impairment minimum imbed method, be the gray scale that needs are imbedded the pixel of information to be changed over immediate one of original gray-scale value of this pixel comprise the prime number value, ratio value is at interior and neighbor or the relevant gray-scale value of standard grayscale value pixel.
6, the method for the image information of carrying out being imbedded based on human-eye visual characteristic according to claim 1, it is characterized in that: utilized the redundancy that variation had of human eye gradation of image, each bitmap at image, determinedly make the minimized of image quality loss, definite means of the bitmap of can the information of carrying out imbedding are to imbed the computer code information that the form of different gray scales site is represented in the high bitmap of image.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707718A (en) * | 2009-11-18 | 2010-05-12 | 北京中星微电子有限公司 | Control method of discrete cosine transform and device thereof |
| CN101615286B (en) * | 2008-06-25 | 2012-01-04 | 中国科学院自动化研究所 | Blind hidden information detection method based on analysis of image gray run-length histogram |
| CN104376280A (en) * | 2013-08-12 | 2015-02-25 | 天津市阿波罗信息技术有限公司 | Image code generating method for Google project glass |
| CN105243409A (en) * | 2014-07-07 | 2016-01-13 | 顾泽苍 | Printed image information embedding and identifying method enabling public to read and identify code information easily through mobile phone |
| CN109377442A (en) * | 2018-09-12 | 2019-02-22 | 湖北工程学院 | Image encryption parasitism guard method based on lifting wavelet transform |
-
2007
- 2007-03-06 CN CN 200710056867 patent/CN101021940A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615286B (en) * | 2008-06-25 | 2012-01-04 | 中国科学院自动化研究所 | Blind hidden information detection method based on analysis of image gray run-length histogram |
| CN101707718A (en) * | 2009-11-18 | 2010-05-12 | 北京中星微电子有限公司 | Control method of discrete cosine transform and device thereof |
| CN104376280A (en) * | 2013-08-12 | 2015-02-25 | 天津市阿波罗信息技术有限公司 | Image code generating method for Google project glass |
| CN105243409A (en) * | 2014-07-07 | 2016-01-13 | 顾泽苍 | Printed image information embedding and identifying method enabling public to read and identify code information easily through mobile phone |
| CN109377442A (en) * | 2018-09-12 | 2019-02-22 | 湖北工程学院 | Image encryption parasitism guard method based on lifting wavelet transform |
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