CN106650874A - Display method and device for paper fiber characteristics, and anti-counterfeiting method for paper fiber characteristics - Google Patents
Display method and device for paper fiber characteristics, and anti-counterfeiting method for paper fiber characteristics Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 127
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- 238000000879 optical micrograph Methods 0.000 description 3
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- 238000012913 prioritisation Methods 0.000 description 2
- 102000016359 Fibronectins Human genes 0.000 description 1
- 108010067306 Fibronectins Proteins 0.000 description 1
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- 230000003362 replicative effect Effects 0.000 description 1
- 210000003765 sex chromosome Anatomy 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
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Abstract
The invention relates to a display method and device for paper fiber characteristics, and an anti-counterfeiting method for the paper fiber characteristics. The display method comprises the following steps that: firstly, collecting an electronic image of the specific area of paper; then, utilizing a fiber image template to carry out template matching on the collected electronic image, and selecting characteristic points corresponding to the electronic image of which the similarity with the fiber image template is greater than a set threshold value as paper fiber image characteristic points; according to a set priority, screening the obtained characteristic points; and finally, coding the characteristic information of the screened characteristic points, and forming a two-dimensional coding graph corresponding to the paper fiber characteristics, wherein the characteristic display area of the coding graph adopts a characteristic point display symbol corresponding to temperature information used by the characteristic points, and the characteristic point display symbol is used for displaying a fiber texture direction and fiber thickness information on a characteristic point position. By use of the display method, accurate and remarkable paper characteristics can be obtained and are displayed through a two-dimensional code, and users can conveniently directly judge the paper characteristics according to the obtained two-dimensional coding graph.
Description
Technical field
The present invention relates to a kind of display of paper fibre feature, method for anti-counterfeit and device, belong to image recognition coding techniques
Field.
Background technology
Recently internet finance is developed rapidly, the online payment of various ways, network trading, Web bank and ecommerce
Service application and give birth to, building the ID authentication mechanism of the safe mutual trust of both parties becomes extremely important, from currently used fortune
From the point of view of row mechanism and technology path, have that authentication is difficult, security is not high, process of exchange is frequent, management cost is high and
Electronic transaction be present.In this technical field, the space being greatly improved.Such as digital watermarking or number
The transaction medium such as check, electronic invoice, electronic contract, special note of word signature exist the safety issue of authentication and
It is replicated the potential safety problem of bogus attack.And circulate and the 2 D code information on internet, electronic signature scan code, electronics
Label, software key the electronic certificate information such as share due to there is the risk without evidence in kind, and party concerned is in identity for transaction
Security breaches are there are still in confirmation.This security breaches can by solving to paper identification, but official document, data, bill
And the important information on the paper material such as certificate generally carry out by the way of plain paper is with an official seal affixed it is false proof, due to office
Paper material information it is counterfeit more and more easily, it is false proof to become more and more difficult, and cause this mode also to become dangerous.
The content of the invention
It is an object of the invention to provide a kind of display methods of paper fibre feature, with solve current paper fibre feature without
The problem that method intuitively shows；Present invention also offers a kind of method for anti-counterfeit based on paper fibre feature, to realize to paper
Identification.
The present invention provides a kind of display methods of paper fibre feature to solve above-mentioned technical problem, the display methods bag
The step of including is as follows：
1) electronic image of the specific region of paper is gathered；
2) template matches are carried out to the electronic image for gathering using fibre image template, is chosen similar to fibre image template
Degree is more than the corresponding characteristic point of electronic image of given threshold as paper fibre image characteristic point；
3) characteristic point for obtaining is screened according to the priority of setting；
4) characteristic information of the characteristic point after screening is encoded, is formed corresponding with paper fibre feature two-dimensional encoded
Figure, the feature viewing area of the code pattern adopts and uses the corresponding characteristic point display symbol of Template Information with characteristic point, described
Characteristic point shows that symbol is used to show fiber pattern direction, the thickness information of fiber at characteristic point position.
Further, the two-dimensional encoded figure also at least includes angle finger URL, collection position symbol, central campus certainly position
One in symbol, side calibration areas and feature one-dimensional coding area, described angle finger URL is used for the two-dimensional encoded figure of locating paper sheets feature
One jiao；Described collection position symbol is used to indicate the collection position of paper fibre image；The quasi- finger URL of described central campus
For the encoded block position correction of the two-dimensional encoded figure of paper features；Described side calibration areas are used to correct paper features two dimension volume
Encoded block position in code figure；Described feature one-dimensional coding area is used to show feature one-dimensional coding.
Further, described feature one-dimensional coding is used for the characteristic information of the characteristic point to being screened and encodes, often
The coding information of individual characteristic point at least includes template number, abscissa and ordinate that characteristic point is used.
Further, the method also includes coarse and standardization processing are carried out on yardstick to characteristic information：To be adopted
The electronic image of collection carries out piecemeal, and forms the new yardstick coordinate system of the serial number numerical value of piecemeal arrangement from left to right from top to bottom；
Using step 2) in the characteristic point bianry image that obtains the center of connected domain fall into image block area coordinate as new feature
Point position coordinates, the standardization feature point coordinates (X for obtainingτ, Yτ) be：
Xτ=aτ-x0,Yτ=bτ-y0, τ=1 ... E
Wherein (x0,y0) be all blocking characteristic points the centre of form；(aτ,bτ) be the τ piecemeal piecemeal coordinate, E for sequence
Remaining connected domain number after screening.
Further, step 3) in priority adopt following rule：
A. the priority of the big characteristic point of template width is more than the little characteristic point priority of template width；
B. the big priority of connected domain area residing for characteristic point is more than the little characteristic point priority of connected domain area；
If c. connected domain area is identical, from top to bottom from left to right according to the precedence decision priority for occurring.
Present invention also offers a kind of display device of paper fibre feature, the identifying device includes acquisition module, matching
Module, screening module and coding display module,
Described acquisition module is used for the electronic image of the specific region for gathering paper；
Described matching module is used to carry out template matches to the electronic image for gathering using fibre image template, choose with
Fibre image template similarity is more than the corresponding characteristic point of electronic image of given threshold as paper fibre image characteristic point；
Described screening module is used to screen the characteristic point for obtaining according to the characteristic point priority of setting；
Described coding display module is used to encode the characteristic information of the characteristic point after screening, forms fine with paper
The corresponding two-dimensional encoded figure of dimensional feature, the feature viewing area of the code pattern adopts and uses the corresponding spy of Template Information with characteristic point
Levy and to show a symbol, described characteristic point show the fiber pattern direction that symbol is used to showing at characteristic point position, fiber it is thick
Thin information.
Present invention also offers the step of a kind of method for anti-counterfeit based on paper fibre feature, method for anti-counterfeit is as follows：
1) electronic image of the specific region of paper is gathered；
2) template matches are carried out to the electronic image for gathering using fibre image template, is chosen similar to fibre image template
Degree is more than the electronic image of given threshold as paper fibre characteristics of image；
3) characteristic point for obtaining is screened according to the priority of characteristic point；
4) characteristic point after screening is encoded, forms two-dimensional encoded figure corresponding with paper fibre feature, the coding
The feature viewing area of figure adopts and uses Template Information corresponding characteristic point display symbol, described characteristic point to show with characteristic point
Symbol is used to show fiber pattern direction, the thickness information of fiber at characteristic point position；
5) by obtain it is two-dimensional encoded print on shielded paper, comparison prints on paper features two on paper
Feature viewing area in dimension code pattern, if having identical to show symbolic construction combination, proves that the paper is without overscanning
With the paper after duplicating.
Further, the two-dimensional encoded figure also at least includes angle finger URL, collection position symbol, central campus certainly position
One in symbol, side calibration areas and feature one-dimensional coding area, described angle finger URL is used for the two-dimensional encoded figure of locating paper sheets feature
One jiao；Described collection position symbol is used to indicate the collection position of paper fibre image；The quasi- finger URL of described central campus
For the encoded block position correction of the two-dimensional encoded figure of paper features；Described side calibration areas are used to correct paper features two dimension volume
Encoded block position in code figure；Described feature one-dimensional coding area is used to show feature one-dimensional coding.
Further, the method also includes coarse and standardization processing are carried out on yardstick to characteristic information：To be adopted
The electronic image of collection carries out piecemeal, and forms the new yardstick coordinate system of the serial number numerical value of piecemeal arrangement from left to right from top to bottom；
Using step 2) in the characteristic point bianry image that obtains the center of connected domain fall into image block area coordinate as new feature
Point position coordinates, the standardization feature point coordinates (X for obtainingτ, Yτ) be：
Xτ=aτ-x0,Yτ=bτ-y0, τ=1 ... E
Wherein (x0,y0) be all blocking characteristic points the centre of form；(aτ,bτ) be the τ piecemeal piecemeal coordinate, E for sequence
Remaining connected domain number after screening.
Further, the step 3) in priority follow following criterion：
A. the priority of the big characteristic point of template width is more than the little characteristic point priority of template width；
B. the big priority of connected domain area residing for characteristic point is more than the little characteristic point priority of connected domain area；
If c. connected domain area is identical, from top to bottom from left to right according to occur precedence determine priority.
The invention has the beneficial effects as follows:The present invention gathers first the electronic image of the specific region of paper；Then using fibre
Dimension image template carries out template matches to the electronic image for gathering, and chooses with fibre image template similarity more than given threshold
The corresponding characteristic point of electronic image as paper fibre image characteristic point, and according to setting characteristic point priority to the spy that obtains
Levy and a little screened；Finally the characteristic information of the characteristic point after screening is encoded, is formed corresponding with paper fibre feature
Two-dimensional encoded figure, the feature viewing area of the code pattern adopts and use the corresponding characteristic point display of Template Information to accord with characteristic point
Number, characteristic point shows that symbol is used to show fiber pattern direction, the thickness information of fiber at characteristic point position.The present invention can
Accurate, significant paper features are obtained, and paper features are intuitively shown by Quick Response Code, user can convenient basis
The two-dimensional encoded figure for obtaining directly judges the feature of paper.
Additionally, the present invention's also prints on the two-dimensional encoded figure for obtaining on shielded paper, comparison prints on paper
The feature viewing area in the two-dimensional encoded figure of paper features on, if having identical to show symbolic construction combination, proving should
Paper is, without the paper after overscanning and duplicating, to realize to the false proof of paper, and the method for anti-counterfeit can be used in internet finance
Copy-resistant digital watermark, single significant digits signature, electronic real object mixing invoice, contract and bank paying safety etc. neck
Domain, improves the confidence level of transaction square authentication at that time.
Description of the drawings
Fig. 1 is the fibre image of paper；
Fig. 2 is standard form basic parameter schematic diagram；
Fig. 3 is the standard form image and numbering schematic diagram for generating；
Fig. 4 is the connected domain screening process schematic diagram of characteristic point bianry image；
Fig. 5 is paper features one-dimension code coding schematic diagram；
Fig. 6 is the two-dimensional encoded schematic diagram of paper features；
Fig. 7-a are Angle Position two-dimensional encoded figures in paper lower-left in the embodiment of the present invention；
Fig. 7-b are the two-dimensional encoded figures of paper lower right position in the embodiment of the present invention；
Fig. 8 is the false proof distribution principle schematic diagram of anti-reprography；
Fig. 9 is applied to the principle schematic of mixed electronic contract, electronic invoice.
Specific embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings.
A kind of embodiment of the display methods of paper fibre feature of the present invention
The present invention gathers first the electronic image of the specific region of paper；Then electricity of the fibre image template to collection is utilized
Subgraph carries out template matches, chooses characteristic point corresponding with the electronic image that fibre image template similarity is more than given threshold
As paper fibre image characteristic point；The last characteristic point priority according to setting is screened to the characteristic point for obtaining, so as to
Identify the fiber characteristics of paper.
1. the electronic image of the specific region of paper is gathered.
The paper features of the present invention refer to that from paper features region Jing optical microphotographs lens amplify, adopted by imageing sensor
The characteristics of image of paper fibre in the electronic image of collection.Specific region is limited to (optional apart from two edge certain distances of paper
Select the edge 10mm of distance two) parallel lines joining position, size is about the region of 0.3*0.3mm.Such defined feature
The reason for extracting object is the precision of blessing and locating paper sheets manually about in 0.1mm or so, the physics amplification of optical microphotograph
Multiple is substantially：The region of 6mm/0.3mm, i.e., 20 times or so, wherein 6mm is the width of imaging plate, and 0.3mm is microscopic region
Actual size.Assume that image sensor resolutions adopt 640*480, if effective district is 480*480, i.e. width is 480 samplings
Point.If can detect and recognize more than 10 wide fibers of pixel in image, the fiber width of actual detectable identification is 10*
0.3mm/480=0.006mm, that is to say, that the bright fiber recognized more than 6 microns of thicknesses.
Paper fibre image definition is：Fiber in paper is projected through light, the collection of Jing imageing sensors, the ash for being obtained
By two curves being parallel to each other that the strong and weak change of gray scale is formed in degree image, the fiber imaging as in paper.Hand in length and breadth
Wrong fiber imaging constitutes fibre image, as shown in Figure 1.The image is apart from paper lower edge 10mm and left margin 10mm
Point of intersection, area is about 0.3mm*0.3mm regions acquired image.Therefore the feature extraction object set by the present invention is：
More than 6 microns of thicknesses paper fibre on 6mm or so imaging panels imaging.
2. image template is constructed
Constant stable paper identity characteristic is fixed from numerous and disorderly fibre image great difficulty, adopts
With different image processing techniques and Feature Extraction Technology, different characterization results can be obtained, it is invisible be shaped as it is unique,
Consistent identity characteristic coding information.For this purpose, the present invention uses self-structuring fiber characteristics image template, by the fibre of self-structuring standard
Dimension template image carries out images match to gathered image, to extract paper fibre characteristics of image.
Its physical characteristic of fiber in paper is closely related with its characteristics of image in imaging, local fiber image
Most obvious physical features be：Width, length, direction and light and shade change, as shown in Fig. 2 standard feature matching template is such as
Shown in Fig. 2, wherein w represents the imaging width of fiber, and the diameter of actual reflection fiber is carried to reduce by standard form matching
Take the ambiguousness of feature, it is stipulated that use centrifugal pump, set, i.e., only consider to use the fiber image width of these three diameters fine as standard
Dimension imaging width, d represents the width of standard form, sets d=6w, represents the extension of fiber in Current standards template image unit
Direction, is also adopted by the representation of centrifugal pump, only takes setting number direction, and 12 radian directions, θ ∈ are only taken in the present embodiment
Φ：
Φ={ θj| j=1,2 ... 12 }
={ the 0 π/12 π/6 π/4 π/π of 35 π/12 pi/2 7/12 2 π/3 3 π/4 5 π/6 11 π/12 }
The present invention adopts the Gaussian hat Mathematical Modeling of two back-offs, and by rotation, Zoom method synthetic fibers Prototype drawing
Picture, the fibrous template iconic model for obtaining is：
Wherein (x, y)=(x ' cos θ+y ' sin θs ,-x ' sin θ+y ' cos θ), θ ∈ Φ (2)
Hypothesis has 3 kinds of fiber widths and 12 kinds of machine directions, collectively generates 36 standard fibers template images, formula
(1) μ is the gray average of whole sampled images effective coverage in：
The wherein gray scale of the sampled point that f (i, j) imageing sensor is obtained, N is efficiently sampling width sampling number, public
η is the gray scale in fiber sideline relative to the contrast of template image gray average in formula (1), is set as：η=20%；Formula (1)
Middle c1And c2It is that the coordinate of two gray scale the lowest point is actually the respective average of two Gaussian curves, formula (1) Gauss of upset
Cap come simulate fiber imaging two dark sides, c1And c2The occurrence for being determines by the centre coordinate and fiber width of template image,
I.e.：
c1=xm-w/2
c2=xm+w/2
Gauss variances sigma is in formula (1)：σ=w/7, (x ', y ') is the coordinate before rotation, and (x, y) is after image rotation
Coordinate, the anglec of rotation is θ, θ ∈ Φ, i.e. anglec of rotation radian value according to above-mentioned 12 direction radian value.
When 3 kinds of fiber widths and 12 kinds of machine directions is chosen, 36 standard form images can be obtained, as shown in Fig. 2 word
Symbol B0～B35Subscript state template numbering, list the template of three kinds of width in figure altogether：12 master dies of 0～11 numbering
Plate fiber width is maximum；The template fiber width of 12～23 numberings is placed in the middle, and 24～No. 35 template fiber widths are minimum.
When being screened using above-mentioned standard template, it is necessary to set priority, the priority of template determines the choosing of feature
Order is taken and is accepted or rejected, is the feature for preferentially choosing good stability, the feature of the high template extraction of the use priority can preferentially be chosen,
According to the standard fibers template image and its coding rule that generate, the prioritization method of template is：Template width is identical then
Priority is identical；The little template priority of numbering is more than numbering large form priority.
3. paper image feature is extracted using the standard form of construction.
Pointwise matching is carried out using the standard form for building in the effective coverage (M × N) of the paper fibre image of collection
Obtain.Assume template image matrix BkRepresent, the gradation of image matrix X at correspondence scan position(x,y)Represent, subscript (x,
Y) it is matching centre coordinate, then the similarity of template and image is：
The similarity of calculated template and image and given threshold are compared, when similarity is taken setting threshold is more than
The point of value is used as primary features point set
In view of the normalization of feature extraction, to avoid ambiguity, the present invention is using unified standard parameter, given threshold T=
0.5；Matching range parameter M=640, N=480.The image at characteristic point coordinate position and this feature point in set of characteristic points
The image template image for being used has similar architectural feature.Often carrying out matching scanning using a standard form all can produce
One characteristic point position bianry image, 36 matches criteria templates can then produce 36 characteristic point bianry images.Characteristic point is two
Some internal connections region isolated from one another can be formed in value image, these connected regions are numbered, be provided with D connected region
Domain, usesRepresent, a=1,2 ..., D, the maximum gauge of all connected domains is：
Wherein Δ x and Δ y represent respectively the Breadth Maximum and height of characteristic point connected region, by the diameter of connected region by
Arrive greatly it is little be ranked up, only retain the forward some connected domains of sequence, abandon the little connected domain of remaining diameter, it is straight by giving up
The method of the less connected domain in footpath can strengthen the stability for extracting feature, feature in bianry image after ranked screening in the present embodiment
The change of point connected domain is as shown in Figure 4.
4. pair characteristic point extracted carries out standardization processing.
To further enhance feature stability, reduce impact of the disturbance of IMAQ point position to feature stability, will
The location coordinate information of features described above point connected domain carries out coarse on yardstick, and detailed process is as follows：
By whole image pickup area blocking, will image acquisition areas be divided into the larger piecemeal of 15 row × 15 row,
The size of each segmented areas is (N/15) × (M/15), and N and M is the width and height of original image.And formed with from up to
Under from left to right piecemeal arrange serial number numerical value new yardstick coordinate system.Then the characteristic information of template extraction can be reset to：
In former characteristic point bianry image, the above-mentioned image block area coordinate that the center of gravity of connected domain is fallen into, as new characteristic point
Position coordinates, its position coordinate value is the new coordinate system coordinate value that above-mentioned piecemeal is formed, by residing piecemeal coordinate value together with institute
The template number for using is referred to as " blocking characteristic point " as new characteristic point information, the present invention, referred to as " characteristic point ".It is aobvious
So, the characteristic information of blocking characteristic point includes：What the location coordinate information and generation bianry image under new coordinate system was used
Template number information.
If remaining connected domain number is E after sequence screening, in order to standardize, if E=16, the weight of each connected region is calculated
Heart coordinate, judges the above-mentioned image block for falling into.If falling into the piecemeal of a rows b row, being represented with piecemeal coordinate (a, b) should
The positional information of blocking characteristic, blocking characteristic point position coordinates specification is turned to：
Xτ=aτ-x0,Yτ=bτ-y0, τ=1 ... E
(x in above formula0,y0) be all blocking characteristic points the centre of form；Piecemeal coordinate (ai,bi) it is normalized after obtain specification
Change feature point coordinates (Xτ, Yτ)。
Paper features point can be represented with the following method:Every time the image of collection only takes E blocking characteristic point, the feature of paper
Point full detail is represented by：
δτ(k,s,(Xτ,Yτ)), k=0,1 ..., 35, τ=1,2 ..., E
Wherein k is used template BkTemplate number, s is the area of residing connected domain, (Xτ,Yτ) divide for standardization
Block feature point coordinates.
5. paper features point is screened
The screening of paper features point is determined after the prioritization of characteristic point, and priority function O is represented, paper
The priority rule of characteristic point is：
A. the priority of the big characteristic point of template width is more than the little characteristic point priority of template width.For example, characteristic point
δ1The template number for being used is k1, template width is wk1, residing connected domain area is s1；Characteristic point δ2The template for being used is compiled
Number be k2, template width is wk2, residing connected domain area is s2；If template width wk1＞ wk2, then P (δ1(k1,s1)) ＞ P (δ2
(k2,s2))。
B. the big priority of connected domain area residing for characteristic point is more than the little characteristic point priority of connected domain area.
C. from top to bottom from left to right according to the precedence decision priority for occurring if connected domain area is identical.
According to the priority principle of characteristic point, treatment on special problems is as follows：
If i. connected domain barycentric coodinates fall into identical piecemeal, the little characteristic point of connected domain area is directly dropped.
Ii. the different connected region center of gravity that same template is produced fall into identical piecemeal, first judge connected domain area, if
Area is identical, then compare template width.Template width is little to be rejected；If both all sames, determine according to the order for occurring,
What is first occurred is retained.
According to features described above point priority principle and treatment on special problems method, to the characteristic point that retains minor sort again, make
Characteristic point sequence number is equal to its priority, if with P (δτ) represent characteristic point δτPriority, then：
P(δ1) ＞ P (δ2) ＞ ... ＞ P (δE)
Obviously, the little characteristic point priority of sequence number is higher.
6. the paper features of characteristic point are encoded after pair screening, form the two-dimensional encoded figure of paper, the feature of the code pattern
Viewing area adopts and use Template Information corresponding characteristic point display symbol, described characteristic point display symbol to be used for characteristic point
Show fiber pattern direction, the thickness information of fiber at characteristic point position.
1) paper features Jing after screening are encoded using one-dimension code.
Paper features one-dimensional coding is that the characteristic information to features described above point is encoded, according to the sequence number or excellent of characteristic point
First level determines coding precedence.Coding method is as shown in figure 5, one-dimensional coding content includes：The version number of coding standard, collection
Station location marker, feature point number, characteristic point coding (template number that used including each characteristic point, abscissa, ordinate,
Reserved place and check code), time encoding, paper identification equipment global unique identification number, user arrange identification code, user arrange
Ciphertext code and check code are constituted.This feature one-dimensional coding scheme, 16 characteristic points of codified, then maximum encodes digit is：8
+ 2+1+4+1+16 × (6+4+4+1+1)+24+32+16+24+1=370 positions.
The position encoded implication of 2 collections after Tu5Zhong version numbers is provided as follows：00 lower left corner for representing paper；01 table
Show the lower right corner；10 represent the back side of paper lower left corner；11 represent the back side of paper lower right corner.4 abscissas and 4 in characteristic point coding
Position ordinate represent be it is normalized after characteristic point piecemeal coordinate, the sign of the highest order denotation coordination in 4：1
Negative coordinate is represented, 0 represents positive coordinate.Paper features one-dimensional coding can be transmitted directly to terminal by the interface of equipment, while
During the two-dimensional encoded figure of paper features can be encoded to, shown by paper identification equipment or printed on paper, with facilitate mobile phone,
Apparatus such as computer extracting directly.
2). image paper carried out on the basis of one-dimensional coding two-dimensional encoded.
Paper features are two-dimensional encoded as shown in fig. 6, two-dimensional encoded content includes encoded block, angle finger URL, collection position
The quasi- finger URL of set symbol, central campus, side calibration areas, feature one-dimensional coding area, feature viewing area and characteristic point show symbol, below
The above for being included is described in detail.
Encoded block is to be printed upon minimum code base unit that is on paper or being displayed on equipment, by black rectangle
The white rectangle block composition of block or equal size, black block presentation code " 1 ", the white block presentation code of equal size
“0”。
Angle finger URL is made up of 5 × 5 encoded block, is shaped as the square shape of Intermediate Gray point, special for locating paper sheets
Levy two-dimensional encoded figure one jiao, for example, other three corner location symbols of the outer symbol in the lower left corner are all angle finger URLs in Fig. 6.
Collection position symbol be made up of 5 × 5 encoded block, shape as shown in Fig. 6 lower left corners, for represent paper fibre
The collection position of dimension image, what is represented in such as Fig. 6 is the paper features extracted in the paper lower left corner, if in lower right corner collection
Image, then need being placed on lower right position after lower left corner symbol or so upset 180 degree, and former lower-left Angle Position then makes angle into and determines
Position symbol.
The quasi- finger URL of central campus is made up of 3 × 3 encoded block, the shape such as shape of the mouth as one speaks, and position is in the two-dimensional encoded figure of feature
Feature viewing area center, for the encoded block position correction of the two-dimensional encoded figure of paper features, the center of feature viewing area
Position, is also the position of form center of each paper features point.
Four lines of the positive diagonal orientation symbol centre code block in side calibration areas or collection position symbol centre code block
On position, the encoded block for being separated by arrangement by equidistant, black and white constitutes side calibration areas, for the two-dimensional encoded figure of alignment features
In encoded block position.
The left and right sides of the adjacent side calibration areas in feature one-dimensional coding area or the region of upper and lower parallel position are paper features one
Dimension code area.It is mainly used in showing paper features one-dimensional coding in this regional code.The coding of paper features one-dimensional coding
Order number designation as shown in Figure 6 is carried out in proper order.I.e. from the beginning of the encoded block position that numbering is 1, counterclockwise along feature one
The rotation of dimension code area takes two turns, until the position that numbering is 370 is terminated, common codified 370.And setting according to feature one-dimensional coding
Meter scheme, can just take whole coding site.
Feature viewing area is the paper features two in addition to angle finger URL or collection position symbol and feature one-dimensional coding area
The remaining central region of dimension code pattern is characterized viewing area, and feature viewing area is used for showing some keys, the spy that priority is high
An information is levied, and characteristic point information characteristic point shows symbolic formulation, it is therefore an objective to carrying out paper image with paper identification equipment
When collection and feature recognition, the position of fine adjustment for paper is aided in, to obtain accurate take, significant paper features, another effect
Exactly when user carries out paper checking, facilitate user with the naked eye directly to judge the feature of paper, paper identification equipment is shown
The two-dimensional encoded figure of paper features for showing and the Quick Response Code figure for printing are compared, and are seen whether with identical feature, so as to sentence
It is disconnected to change whether paper is scanned through replicating.
Characteristic point shows that symbol is the expression that simplifies of the template image that used characteristic point, and this feature point is used
Template Information is corresponding, can express the information such as fiber pattern direction, the thickness of fiber at this feature point position, specifically, this
Show that the corresponding relation between symbol and template number is as shown in table 1 in embodiment.
Table 1
By above-mentioned coded system, the two-dimensional encoded figure of paper features of acquisition as shown in Fig. 7-a and Fig. 7-b, wherein, Fig. 7-
A is that the paper lower left corner gathers the feature Quick Response Code figure that identification is formed；Fig. 7-b are the paper that the paper lower right corner gathers and recognizes
Feature Quick Response Code figure.
A kind of embodiment of the display device of paper fibre feature of the present invention
Identifying device in the present embodiment includes acquisition module, matching module, screening module and coding display module, collection
Module is used for the electronic image of the specific region for gathering paper；Matching module is used for the electronics using fibre image template to collection
Image carries out template matches, chooses characteristic point corresponding with the electronic image that fibre image template similarity is more than given threshold and makees
For paper fibre image characteristic point；Screening module is used to sieve the characteristic point for obtaining according to the characteristic point priority of setting
Choosing；Coding display module is used to encode the characteristic information of the characteristic point after screening, is formed corresponding with paper fibre feature
Two-dimensional encoded figure, the feature viewing area of the code pattern adopts and use the corresponding characteristic point display of Template Information to accord with characteristic point
Number, characteristic point shows that symbol is used to show fiber pattern direction, the thickness information of fiber at characteristic point position.The tool of each module
Body realization rate has been described in detail in the embodiment of recognition methods, repeats no more here.By the display of the present invention
Method and apparatus, can obtain identical characterization results, form unique, consistent identity characteristic coding information, realize
Identification to paper fibre feature.
The present invention can obtain accurate, significant paper features, and paper features are intuitively shown by Quick Response Code
Show, user easily can directly judge the feature of paper according to the two-dimensional encoded figure for obtaining.
A kind of embodiment of the method for anti-counterfeit based on paper fibre feature of the present invention
Method for anti-counterfeit in the present embodiment is realized on the basis of paper fibre characteristic display method, will obtain paper two
Dimension code pattern is directly printed on plain paper, can both detect digital watermarking and the digital signature being replicated, and net is can be used for again
The retention in kind of network transaction both parties.By obtain it is two-dimensional encoded print on shielded paper, comparison print on paper
The feature viewing area in the two-dimensional encoded figure of paper features on, it is provable if having identical to show symbolic construction combination
The paper is without the paper after overscanning and duplicating.
Illustrate as a example by during method for anti-counterfeit is applied to anti-scan and copy and mixed electronic contract below, wherein using reality
Example 1 is applied to anti-scan and copy, and application example 2 is applied to mixed electronic contract.
Application example 1
In recent years, digital watermark technology and ciphering two-dimension code technology had been obtained for extensively application.But both technologies exist
Impassable technology short slab is there are still in practical application：High resolution scanning reprography can not be resisted to invade copyright
Evil.However, can solve the above problems if the paper false proof method using the present invention, paper false proof method of the present invention is presented herein below
Application example 1.
As shown in Fig. 8 a kind of false proof dissemination method：A. first, by paper identification equipment in the paper blank lower left corner or
The lower right corner respectively gathers and recognizes paper away from paper edge at 10mm, obtains the two-dimensional encoded figure of paper features；B. it is publisher is close
Literary information Jing digital watermark technology or planar bar code technology form digital watermarking or ordinary two dimensional code after processing, and paper two dimension is compiled
Code figure prints on need on paper to be protected together.Dotted line is meant that in figure：Can also be one-dimensional by the paper features extracted
Coding information and publisher's cipher-text information mix, and form digital watermarking or ordinary two dimensional code is printed on shielded paper.
Judge that paper is the paper of primary cloth, the paper for being still scanned through or duplicating, method is：
A () shows the two-dimensional encoded figure of feature of current paper sheet with paper identification equipment, comparison prints on the paper on paper
Feature viewing area in the two-dimensional encoded figure of feature, if having identical to show symbolic construction combination, the provable paper is not for
Paper after being scanned through and duplicating.
B () extracts digital watermark information or ordinary two dimensional code information with mobile phone, other scanning devices, with from paper features two
The paper features one-dimensional coding information decoding publisher's ciphertext obtained on dimension code pattern, so as to judge that paper content comes from issue
Side.
Application example 2
In recent years, internet finance, ecommerce, network trading were developed rapidly, however, the authentication in the middle of transaction is asked
Topic is not but well solved all the time.For example, E-seal or electronic signature etc. be all-electronic or virtualized letter
Breath cannot provide safe evidence in kind, and this brings unprecedented difficulty to the legal arbitration occurred after transaction.How to put down
The safe and reliable sex chromosome mosaicism of weighing apparatus electronic certificate and material evidence exchange problem the main problem for facing.The present invention is by paper features information
The electronic information of mixed contract is exchanged with each other, and it is above-mentioned to take the method for each printing material evidence retention to solve well
Problem.Fig. 9 is the application process of mixed electronic contract or invoice, and operating procedure is described as follows：
(1) Party A takes a common paper blank, the two-dimensional encoded figure of paper features for obtaining the paper with paper identification equipment.
Party A edits on computers contract, inserts digital sealing or the electronic signature of Party A, and the two-dimensional encoded figure of paper features is inserted
The contract edited.
(2) the 1st printing is containing Party A's digital sealing on the paper blank or signs electronically and paper features two dimension
The contract of code pattern.
(3) contract printed with the step of scanner scanning (2nd), obtains scanning electron version.
(4) Party A sends scanning electron version contract to Party B by network.
(5) Party B by network receive Party A be transmitted through come scanning electron version contract.
(6) Party B takes a common paper blank, the two-dimensional encoded figure of paper features for obtaining the paper with paper identification equipment.
(7) Party B is inserted into the feature of the paper two-dimensional encoded figure in the electronic edition contract that Party A is transmitted, and by Party B
The digital sealing or electronic signature of oneself compiles together new electronic edition contract.
(8) Party B prints the electronic edition contract of new synthesis on the paper blank that (6th) step is obtained and retains as material evidence.
(9) Party B sends the electronic edition contract of new synthesis to Party A by network.
(10) Party A receives the new synthesis electronic edition contract that Party B is transmitted by network.
(11) Party A will newly synthesize print on paper (the 2nd printing) and the conduct that electronic edition contract is printed in (2nd) step
Material evidence is retained.
By step (1) to (11), it can be seen that both sides do not carry out exchange in kind, and obtain other side
The condition code information of paper is retained, each has voucher in kind and scanning electron version evidence.It is additionally, since using scanning contract
The method of content, effectively prevent distorting for treaty content.So, electronic certificate safety, authentication integrity problem and
Material evidence is exchangeed problem all while being resolved.
Obviously, above-mentioned application process has following several advantages：
A (), due to being the electronic scanned document after printing by the content of network delivery, treaty content is difficult to distort.
B () paper features code ensure that the single validity of contract so that the contract for duplicating or scanning is invalid.This is fitted very much
Close the application of the single contract such as electronic invoice and check.
C () does not separate transmission due to E-seal or digital signature with treaty content, it is ensured that its security.
D () arbitration side need not retain any material evidence of contract both sides, tangible evidence is retained by both parties.Pipe can significantly be mitigated
The responsibility and pressure of reason person.It is suitable for the application of electronic invoice.
E () referee method is simple：Arbitration side requires that both sides show transaction voucher in kind, even if side refusal shows voucher,
As long as then judging side's of the showing material object voucher true and false (decision method is with application example one), and electronic signature or the electricity of both sides can be extracted
Sub- seal information, you can sentence and show voucher side and win a lawsuit.
The present invention amplifies on the specific region Jing optical microphotographs lens of plain paper, and gathers electronic image by sensor,
Paper fibre feature is extracted by the standard form matching for designing in advance, the feature extracted is encoded by certain way, form paper
Feature one-dimension code and two-dimensional encoded figure.The two-dimensional encoded figure of this feature is directly printed on plain paper, thing is worked as by transaction
Fang Zuowei material object material evidences are retained.Because this code pattern has storing paper identification information, shows that paper trunk fibre structure is special
Levy, the ability such as unlabeled fibronectin image capture position, storing paper identification equipment identification number and user's ciphertext, therefore can solve to hand over
The integrity problem of easy party concerned's authentication.Present invention is mainly applied to the water that the anti-copying and scanning in internet finance is attacked
The security fields such as print technology, mixed electronic invoice, electronic contract and bank paying.
Claims (10)
1. a kind of display methods of paper fibre feature, it is characterised in that the step of display methods includes is as follows：
1) electronic image of the specific region of paper is gathered；
2) template matches are carried out to the electronic image for gathering using fibre image template, is chosen big with fibre image template similarity
In the corresponding characteristic point of the electronic image of given threshold as paper fibre image characteristic point；
3) characteristic point for obtaining is screened according to the priority of setting；
4) characteristic information of the characteristic point after screening is encoded, forms two-dimensional encoded figure corresponding with paper fibre feature,
The feature viewing area of the code pattern adopts and uses Template Information corresponding characteristic point display symbol, described feature with characteristic point
Point shows that symbol is used to show fiber pattern direction, the thickness information of fiber at characteristic point position.
2. the display methods of paper fibre feature according to claim 1, it is characterised in that the two-dimensional encoded figure is also extremely
Include in angle finger URL, collection position symbol, the quasi- finger URL of central campus, side calibration areas and feature one-dimensional coding area less,
Described angle finger URL is used for a jiao of the two-dimensional encoded figure of locating paper sheets feature；Described collection position symbol is used to indicate paper
The collection position of fibre image；The quasi- finger URL of described central campus is used for the encoded block position school of the two-dimensional encoded figure of paper features
It is accurate；Described side calibration areas are used to correct the encoded block position in the two-dimensional encoded figure of paper features；The one-dimensional volume of described feature
Code area is used to show feature one-dimensional coding.
3. the display methods of paper fibre feature according to claim 2, it is characterised in that described feature one-dimensional coding
For encoding to the characteristic information of the characteristic point screened, the coding information of each characteristic point is at least made including characteristic point
Template number, abscissa and ordinate.
4. the display methods of paper fibre feature according to claim 1, it is characterised in that the method is also included to feature
Information carries out coarse and standardization processing on yardstick：The electronic image for being gathered is carried out into piecemeal, and is formed from top to bottom
From left to right piecemeal arranges the new yardstick coordinate system of serial number numerical value；By step 2) in obtain characteristic point bianry image in connect
The center in domain falls into image block area coordinate as new characteristic point position coordinate, the standardization feature point coordinates (X for obtainingτ,
Yτ) be：
Xτ=aτ-x0,Yτ=bτ-y0, τ=1 ... E
Wherein (x0,y0) be all blocking characteristic points the centre of form；(aτ,bτ) be the τ piecemeal piecemeal coordinate, E for sequence screening
Remaining connected domain number afterwards.
5. the display methods of paper fibre feature according to claim 1, it is characterised in that step 3) in priority adopt
Use following rule：
A. the priority of the big characteristic point of template width is more than the little characteristic point priority of template width；
B. the big priority of connected domain area residing for characteristic point is more than the little characteristic point priority of connected domain area；
If c. connected domain area is identical, from top to bottom from left to right according to the precedence decision priority for occurring.
6. a kind of display device of paper fibre feature, it is characterised in that the identifying device include acquisition module, matching module,
Screening module and coding display module,
Described acquisition module is used for the electronic image of the specific region for gathering paper；
Described matching module is used to carry out template matches to the electronic image for gathering using fibre image template, chooses and fiber
Image template similarity is more than the corresponding characteristic point of electronic image of given threshold as paper fibre image characteristic point；
Described screening module is used to screen the characteristic point for obtaining according to the characteristic point priority of setting；
Described coding display module is used to encode the characteristic information of the characteristic point after screening, forms special with paper fibre
Levy corresponding two-dimensional encoded figure, the feature viewing area of the code pattern adopts and uses the corresponding characteristic point of Template Information with characteristic point
Symbol is shown, described characteristic point shows that symbol is used to show fiber pattern direction, the thickness letter of fiber at characteristic point position
Breath.
7. a kind of method for anti-counterfeit based on paper fibre feature, it is characterised in that as follows the step of the method for anti-counterfeit：
1) electronic image of the specific region of paper is gathered；
2) template matches are carried out to the electronic image for gathering using fibre image template, is chosen big with fibre image template similarity
In given threshold electronic image as paper fibre characteristics of image；
3) characteristic point for obtaining is screened according to the priority of characteristic point；
4) characteristic point after screening is encoded, forms two-dimensional encoded figure corresponding with paper fibre feature, the code pattern
Feature viewing area adopts and use Template Information corresponding characteristic point display symbol, described characteristic point display symbol with characteristic point
For showing the thickness information of fiber pattern direction at characteristic point position, fiber；
5) by obtain it is two-dimensional encoded print on shielded paper, comparison print on paper paper features two dimension compile
Feature viewing area in code figure, if having identical to show symbolic construction combination, proves that the paper is without overscanning and multiple
Paper after print.
8. the method for anti-counterfeit based on paper fibre feature according to claim 7, it is characterised in that the two-dimensional encoded figure
Also at least include in angle finger URL, collection position symbol, the quasi- finger URL of central campus, side calibration areas and feature one-dimensional coding area
, described angle finger URL is used for a jiao of the two-dimensional encoded figure of locating paper sheets feature；Described collection position symbol is used to indicate
The collection position of paper fibre image；The quasi- finger URL of described central campus is used for the encoded block position of the two-dimensional encoded figure of paper features
Put calibration；Described side calibration areas are used to correct the encoded block position in the two-dimensional encoded figure of paper features；Described feature one
Dimension code area is used to show feature one-dimensional coding.
9. the method for anti-counterfeit based on paper fibre feature according to claim 7, it is characterised in that it is right that the method also includes
Characteristic information carries out coarse and standardization processing on yardstick：The electronic image for being gathered is carried out into piecemeal, and is formed from upper
From left to right piecemeal arranges the new yardstick coordinate system of serial number numerical value under；By step 2) in obtain characteristic point bianry image in
The center of connected domain falls into image block area coordinate as new characteristic point position coordinate, the standardization feature point coordinates for obtaining
(Xτ, Yτ) be：
Xτ=aτ-x0,Yτ=bτ-y0, τ=1 ... E
Wherein (x0,y0) be all blocking characteristic points the centre of form；(aτ,bτ) be the τ piecemeal piecemeal coordinate, E for sequence screening
Remaining connected domain number afterwards.
10. the method for anti-counterfeit based on paper fibre feature according to claim 7, it is characterised in that the step 3) in
Priority follow following criterion：
A. the priority of the big characteristic point of template width is more than the little characteristic point priority of template width；
B. the big priority of connected domain area residing for characteristic point is more than the little characteristic point priority of connected domain area；
If c. connected domain area is identical, from top to bottom from left to right according to occur precedence determine priority.
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| CN110136317A (en) * | 2018-02-05 | 2019-08-16 | 任朝荣 | Papery voucher authentication information production method, device and distinguishing method between true and false, device and system |
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| US20060177093A1 (en) * | 2003-02-28 | 2006-08-10 | Satoru Tsurumaki | Sheet identifying device and method |
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