CN104985913A - Matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting - Google Patents
Matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting Download PDFInfo
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Abstract
The invention discloses a matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting. The matrix circulant screening method comprises the following specific steps: step 1, designing an aggregation-state screening threshold value matrix; step 2, establishing a matrix circulant screening algorithm; step 3, generating a half-tone image; step 4, embedding to-be-hidden graphic-text information; step 5, manufacturing an explicit-implicit tool; and step 6, inspecting hidden graphic-text information. According to the matrix circulant screening method used for graphic-text information hiding and anti-counterfeiting disclosed by the invention, a connecting screen dot with a special shape is generated by utilizing circulant screening of a plurality of threshold matrixes for being applied to a graphic-text information hiding and anti-counterfeiting technology, so that a breakpoint problem which appears during conventional dot matrix screen dot hiding in a current method is solved, hiding effect of the graphic-text information is optimized, and a counterfeiting difficulty coefficient is also increased by introducing the screen dot with the special shape.
Description
Technical field
The invention belongs to printing halftone screen technical field, relate to a kind of method of matrix rotation screening, be specifically related to a kind ofly hide false proof matrix rotation screening method for graph text information.
Background technology
Along with the fast development of printing technology, fraud confusion is grown thickly, and anti-counterfeiting printing technology has become indispensable technological means in press.It is simple that graph text information based on halftone screen technology hides method for anti-counterfeit, do not change the production equipment and process of traditional printing, and can not increase production cost, is to develop more a kind of method for anti-counterfeit in recent years.Hiding of image is realized by skew dot location, and hiding Info after adding corresponding aobvious hidden instrument just can display.At present in the method, because traditionally shaped site is equally distributed lattice information, the phenomenon of breakpoint is there will be after dot location skew, macroscopically form the appreciable white of human eye or black lines, affect the concealment effect of printing quality and graph text information, meanwhile, conventional shape site limitednumber, fake producer easily copies, and false proof coefficient is not high.If utilize multiple threshold matrix rotation screening to generate the link site with special shape, be applied to graph text information and hide in anti-counterfeiting technology, can optimize graph text information concealment effect, the introducing of special shape site also can improve the degree-of-difficulty factor of fraud.
Summary of the invention
The object of this invention is to provide and a kind ofly hide false proof matrix rotation screening method for graph text information, optimize the concealment effect of graph text information, improve false proof coefficient.
The technical solution adopted in the present invention is, a kind ofly hides false proof matrix rotation screening method for graph text information, specifically implements according to following steps:
Step 1, design state of aggregation screening threshold matrix:
If grid exponent number is n × n, cable angle is θ, order
m, n, p, q are integer, and p, q be prime number each other; If screening threshold matrix size is L × K, then threshold maximum value Q
max=L × K, L=m (p
2+ q
2), K=m;
To choose in threshold matrix point centered by a certain grid, according to dot shape requirement, design state of aggregation screening threshold matrix from inside to outside; Change center position, design other 2-5 state of aggregation screening threshold matrix;
Step 2, sets up matrix rotation screening algorithm;
Step 3, generates half tone image:
In MATLAB, input a width gray level image, export the half tone image after screening according to the matrix rotation screening algorithm in step 2;
Step 4, embeds graph text information to be concealed;
Step 5, makes aobvious hidden instrument:
Newly-built grayscale mode file, carries out screening according to method MATLAB in step 3 to it, generates plain net half tone image and is aobvious hidden instrument;
Step 6, inspection concealed video text information.
Feature of the present invention is also,
Design state of aggregation screening matrix in step 1 from inside to outside, to refer in grid numerical value by central point outwards according to production decline law from threshold maximum value Q
maxdistribute successively to 1.
Step 2 is specially: first will treat that the gray level image pixel value F equal proportion of screening is compressed to threshold matrix scope, sets up gray level image pixel value F ' and matrix threshold maximum value Q after transforming
maxmapping relations, then according to the arrangement relation of the multiple threshold matrix rotation of different cable angle, compare the matrix threshold value Q at each coordinate pixel value of gray level image F ' and respective coordinates place after transforming, determine whether this grid exposes, namely when F ' is less than Q, grid exposure, on the contrary do not expose.
After transforming, the mapping relations of gray level image pixel value and matrix threshold value are:
The arrangement of the multiple threshold matrix rotation of different cable angles is closed and is: every a line threshold matrix entirety comparatively lastrow global displacement mq grid.
In step 3, the resolution ratio of gray level image is 300dpi-2400dpi, and size is 3cm × 3cm-10cm × 10cm.
Be specially in step 4: opened in Adobe Photoshop by the half tone image generated in step 3, be grayscale mode by file translations, conversion proportion is 1; In gray-scale document, write hidden text or import hidden image, activating font or hidden image layer constituency, delete the layer that hides Info, displacement information to be concealed constituency completes the embedding of information to be concealed.
Displacement information constituency to be concealed, is specially: utilize displacement facility to carry out the skew of graph text information to be concealed, and the concrete displacement of horizontal direction x and vertical direction y is:
Step 5 is specially: a newly-built resolution ratio, grayscale mode file that size is identical with input gray level image in step 3 in Adobe Photoshop, filling foreground K is 50%-80%, preservation image is picture format, and according to method MATLAB in step 3, screening is carried out to it, generate plain net half tone image and be aobvious hidden instrument.
Step 6 is specially: the plain net half tone image generated in opening steps 5 in Adobe Photoshop, and be converted into grayscale mode, conversion proportion is 1; Copy Background From Layer and obtain background copy, activate constituency, black site, white space is deleted in anti-choosing, this layer is copied in hidden image file, and the aobvious cryptotope of adjustment is put and concealed video text information is displayed.
The invention has the beneficial effects as follows, the present invention is a kind of hides false proof matrix rotation screening method for graph text information, multiple threshold matrix rotation screening is utilized to generate the link site with special shape, being applied to graph text information hides in anti-counterfeiting technology, solve the breakpoint problem occurred when traditional dot matrix site hides in existing method, optimize the concealment effect of graph text information, the introducing of special shape site also improves the degree-of-difficulty factor of fraud.
Accompanying drawing explanation
Fig. 1 is three the 45 ° state of aggregation screening threshold matrixes designed in the embodiment of the present invention;
Fig. 2 is the arrangement graph of a relation of 45 ° of threshold matrix rotations in the embodiment of the present invention;
Fig. 3 is three matrix rotation screening design sketch in the embodiment of the present invention, and wherein a is complete design sketch, and b is partial enlargement design sketch;
Fig. 4 is " little Hua " concealment effect figure in the embodiment of the present invention, and wherein a is complete design sketch, and b is partial enlargement design sketch;
Fig. 5 is aobvious hidden tool results figure in the embodiment of the present invention, and wherein a is complete design sketch, and b is partial enlargement design sketch;
Fig. 6 is that after adding aobvious hidden instrument in the embodiment of the present invention, " little Hua " manifests design sketch, and wherein a is complete design sketch, and b is partial enlargement design sketch.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is a kind of hides false proof matrix rotation screening method for graph text information, specifically implements according to following steps:
Step 1, design state of aggregation screening threshold matrix:
If grid exponent number is n × n, cable angle is θ, order
m, n, p, q are integer, and p, q be prime number each other.If screening threshold matrix size is L × K, then threshold maximum value Q
max=L × K, L=m (p
2+ q
2), K=m.To choose in threshold matrix point centered by a certain grid, according to dot shape requirement, design state of aggregation screening threshold matrix from inside to outside, namely in grid numerical value by central point outwards according to production decline law from threshold maximum value Q
maxdistribute successively to 1.Change center position, design other 2-5 state of aggregation screening threshold matrix.
Step 2, set up matrix rotation screening algorithm:
First will treat that the gray level image pixel value F equal proportion of screening is compressed to threshold matrix scope, set up gray level image pixel value F ' and matrix threshold maximum value Q after transforming
maxmapping relations, namely
According to the arrangement relation of the multiple threshold matrix rotation of different cable angle, i.e. every a line threshold matrix entirety comparatively lastrow global displacement mq grid.After relatively transforming, each coordinate pixel value of gray level image F ' and the matrix threshold value Q at respective coordinates place, determines whether this grid exposes, when F ' is less than Q, and grid exposure (" blacking "), on the contrary do not expose (" whitewashing ").
Step 3, generates half tone image:
Utilize MATLAB programming software to realize screening process: to input a width gray level image, resolution ratio is 300dpi-2400dpi, and size is 3cm × 3cm-10cm × 10cm, exports the half tone image after screening according to the matrix rotation screening algorithm in step 2.
Step 4, embeds graph text information to be concealed:
Opened in Adobe Photoshop by the half tone image generated in step 3, be grayscale mode by file translations, conversion proportion is 1; In gray-scale document, write hidden text or import hidden image, activate font or hidden image layer constituency, deletion hides Info layer, displacement information to be concealed constituency completes the embedding of information to be concealed, namely utilize " filter-other-displacement " instrument to carry out the skew of graph text information to be concealed, the concrete displacement of horizontal direction x and vertical direction y is:
Step 5, makes aobvious hidden instrument:
A newly-built resolution ratio, grayscale mode file that size is identical with input gray level image in step 3 in Adobe Photoshop, filling foreground K is 50%-80%, preservation image is picture format, and according to the MATLAB programming software screening of method in step 3, generate plain net half tone image and be aobvious hidden instrument.
Step 6, inspection concealed video text information:
The plain net half tone image generated in opening steps 5 in Adobe Photoshop, be converted into grayscale mode, conversion proportion is 1; Copy Background From Layer and obtain background copy, activate constituency, black site, white space is deleted in anti-choosing, this layer is copied in hidden image file, and the aobvious cryptotope of adjustment is put and concealed video text information is displayed.
The present invention is used for graph text information and hides false proof matrix rotation screening method, multiple threshold matrix rotation screening is utilized to generate the link site with special shape, being applied to graph text information hides in anti-counterfeiting technology, solve the breakpoint problem occurred when traditional dot matrix site hides in existing method, optimize the concealment effect of graph text information, the introducing of special shape site also improves the degree-of-difficulty factor of fraud.
Now carry out for 45 ° three threshold matrix screening design sketch of 20% gray-scale map grid exponent number 12 × 12 effect that pattern hides and add the effect after aobvious hidden instrument, bright the present invention is used for the detailed process that graph text information hides false proof matrix rotation screening method specifically.
(1) state of aggregation screening threshold matrix is designed:
Grid exponent number is 12 × 12, when cable angle is 45 °,
then p=q=1, gets m=8, K=m=8, L=2m=16, and screening threshold matrix size is 16 × 8, threshold maximum value Q
maxbe 128.To choose in threshold matrix point centered by a certain grid, according to dot shape requirement, design state of aggregation screening threshold matrix from inside to outside, when cable angle is 45 °, in grid, numerical value is outwards distributed from 128 to 1 according to production decline law successively by central point; Change center position, design other 2 different state of aggregation screening threshold matrixes.Figure 1 shows that three the 45 ° state of aggregation screening threshold matrixes adopting the method to design.
(2) matrix rotation screening algorithm is set up:
First will treat that the gray level image pixel value F equal proportion of screening is compressed to threshold matrix scope, set up gray level image pixel value F ' and matrix threshold maximum value Q after transforming
maxmapping relations, namely
Then according to the arrangement relation of 45 ° of cable angle threshold matrixes, every a line threshold matrix entirety comparatively lastrow entirety moves to left 8 grids, the matrix threshold value Q at each coordinate pixel value of gray level image F ' and respective coordinates place after relatively transforming, determine whether this grid exposes, when F ' is less than Q, grid exposure (" blacking "), on the contrary do not expose (" whitewashing ").Figure 2 shows that the arrangement relation of 45 ° of threshold matrix rotations of grid exponent number 12 × 12.
(3) half tone image is generated:
Utilize MATLAB programming software to realize screening process, inputting a width resolution ratio is 2100dpi, and size is 20% gray level image of 5cm × 5cm, exports the half tone image after screening according to the matrix rotation screening algorithm in step 2.Figure 3 shows that " bowknot " site that 20% gray level image three matrix rotation screening is formed and enlarged drawing thereof.
(4) graph text information to be concealed is embedded:
Opened in Adobe Photoshop by " bowknot " halftone dot image generated in step 3, be grayscale mode by file translations, conversion proportion is 1; Draw hidden figure " little Hua ", activate " little Hua " constituency, delete this layer, displacement " little Hua " constituency completes the embedding of information to be concealed, namely " filter-other-displacement " instrument is utilized to carry out the skew of graph text information to be concealed, concrete displacement is: when cable angle is 45 °, level 8 pixel, vertical 0 pixel.Figure 4 shows that " little Hua " concealment effect figure and enlarged drawing thereof.
(5) aobvious hidden instrument is made:
In Adobe Photoshop, a newly-built resolution ratio is the grayscale mode file of 2100dpi, size 5 × 5cm, filling foreground K is 50%, preservation image is jpeg format, and according to the MATLAB programming software screening of method in step 3, generates plain net half tone image and be aobvious hidden instrument.Fig. 5 is aobvious hidden tool results figure and enlarged drawing thereof.
(6) concealed video text information is checked:
The plain net half tone image generated in opening steps 5 in Adobe Photoshop, be converted into grayscale mode, conversion proportion is 1; Copy Background From Layer and obtain background copy, activate constituency, black site, white space is deleted in anti-choosing, this layer is copied to and adds in " bowknot " halftone dot image of hiding " little Hua ", and the aobvious cryptotope of adjustment is put and made to hide " little Hua " and display.Fig. 6 manifests design sketch and enlarged drawing thereof for " little Hua " after adding aobvious hidden instrument.
Claims (10)
1. hide a false proof matrix rotation screening method for graph text information, it is characterized in that, specifically implement according to following steps:
Step 1, design state of aggregation screening threshold matrix:
If grid exponent number is n × n, cable angle is θ, order
m, n, p, q are integer, and p, q be prime number each other; If screening threshold matrix size is L × K, then threshold maximum value Q
max=L × K, L=m (p
2+ q
2), K=m;
To choose in threshold matrix point centered by a certain grid, according to dot shape requirement, design state of aggregation screening threshold matrix from inside to outside; Change center position, design other 2-5 state of aggregation screening threshold matrix;
Step 2, sets up matrix rotation screening algorithm;
Step 3, generates half tone image:
In MATLAB, input a width gray level image, export the half tone image after screening according to the matrix rotation screening algorithm in step 2;
Step 4, embeds graph text information to be concealed;
Step 5, makes aobvious hidden instrument:
Newly-built grayscale mode file, carries out screening according to method MATLAB in step 3 to it, generates plain net half tone image and is aobvious hidden instrument;
Step 6, inspection concealed video text information.
2. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, design the matrix of state of aggregation screening described in step 1 from inside to outside, to refer in grid numerical value by central point outwards according to production decline law from threshold maximum value Q
maxdistribute successively to 1.
3. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, described step 2 is specially: first will treat that the gray level image pixel value F equal proportion of screening is compressed to threshold matrix scope, sets up gray level image pixel value F ' and matrix threshold maximum value Q after transforming
maxmapping relations, then according to the arrangement relation of the multiple threshold matrix rotation of different cable angle, compare the matrix threshold value Q at each coordinate pixel value of gray level image F ' and respective coordinates place after transforming, determine whether this grid exposes, namely when F ' is less than Q, grid exposure, on the contrary do not expose.
4. according to claim 3ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, after described conversion, the mapping relations of gray level image pixel value and matrix threshold value are:
5. according to claim 3ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, the arrangement of the multiple threshold matrix rotation of described different cable angle is closed and is: every a line threshold matrix entirety comparatively lastrow global displacement mq grid.
6. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, in described step 3, the resolution ratio of gray level image is 300dpi-2400dpi, and size is 3cm × 3cm-10cm × 10cm.
7. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, be specially in described step 4: opened in Adobe Photoshop by the half tone image generated in step 3, be grayscale mode by file translations, conversion proportion is 1; In gray-scale document, write hidden text or import hidden image, activating font or hidden image layer constituency, delete the layer that hides Info, displacement information to be concealed constituency completes the embedding of information to be concealed.
8. according to claim 7ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, described displacement information constituency to be concealed, is specially: utilize displacement facility to carry out the skew of graph text information to be concealed, and the concrete displacement of horizontal direction x and vertical direction y is:
9. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, described step 5 is specially: a newly-built resolution ratio, grayscale mode file that size is identical with input gray level image in step 3 in Adobe Photoshop, filling foreground K is 50%-80%, preservation image is picture format, and according to method MATLAB in step 3, screening is carried out to it, generate plain net half tone image and be aobvious hidden instrument.
10. according to claim 1ly a kind ofly hide false proof matrix rotation screening method for graph text information, it is characterized in that, described step 6 is specially: the plain net half tone image generated in opening steps 5 in Adobe Photoshop, and be converted into grayscale mode, conversion proportion is 1; Copy Background From Layer and obtain background copy, activate constituency, black site, white space is deleted in anti-choosing, this layer is copied in hidden image file, and the aobvious cryptotope of adjustment is put and concealed video text information is displayed.
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