CN104036581A - Method and system for identifying authenticity of optically-variable ink area of valuable document - Google Patents

Abstract

The invention discloses a method and system for identifying authenticity of an optically-variable ink area of a valuable document. The method is characterized in that the image information of the ink area of the valuable document is acquired in a plurality of angles and then is compared and analyzed, thus the forged, altered or defected valuable documents can be identified well, and as a result, the identification reliability of the valuable document can be improved. The method disclosed by the embodiment comprises the following steps: S1, sequentially emitting light from at least three angles to the valuable document; S2, sequentially receiving the reflecting light of the light from the at least three angles; S3, converting the reflecting light to obtain the images of the light from at least three angles; S4, respectively extracting the luminance, saturation and contrast characteristics of the images; S5, obtaining the comparison value of the valuable document according to the luminance, saturation and contrast characteristics of the light from the at least three angles; S6, calculating the difference value between the comparison value and the standard value, identifying that the valuable document is authentic if the difference is within the effective fluctuation range, otherwise, the valuable document is false.

Description

The method and system of a kind of value document photochromatic printing ink region truth identification

Technical field

The embodiment of the present invention relates to field of image recognition, is specifically related to the method and system of a kind of value document photochromatic printing ink region truth identification.

Background technology

In current social, for value documents such as banknote, check, invoices, lawless person's imitated situation of faking is varied, for preventing that the value documents such as forgery, adulterium from circulating in market, therefore requires the accuracy of identification of value document higher; Or though value document is true, destroyed or destroy, be unfavorable for circulation and circulate in market, also requirement can be refused out its identification.

To value document, identification comprises following several respects at present:

The file of 1, image texture being faked is refused out;

2, to there being the impaired value document of hole to refuse out;

3, the value document splicing is refused out.

Above three kinds of methods are the conventional valuable document recognition method of financial recognition machine, these methods can identify forgery, adulterium or incomplete value document in the ordinary course of things well, but the today of emerging in an endless stream in fake imitated method and means, above three kinds of valuable document recognition methods can not guarantee forgery, adulterium or incomplete value document to identify.

Value document is by ink printing, and the optic metachromatic effect of optics photochromatic printing ink is to be produced by the optically variable pigments in ink, under the irradiation of different angles, and the color difference presenting.But at present, also lack method for distinguishing is known in value document photochromatic printing ink region.

Summary of the invention

The embodiment of the present invention provides the method and system of a kind of value document photochromatic printing ink region truth identification, gather the image information of value document inked areas by multi-angle, and the mode being analyzed, can well forgery, adulterium or incomplete value document be identified, and then strengthen the reliability to value document identification.

The method of the value document photochromatic printing ink region truth identification that the embodiment of the present invention provides, comprising:

S1: light from least three angles to value document that launch successively;

S2: the reflection of light light of at least three angles described in receiving successively;

S3: to described reflected light convert obtain described in the image of light of at least three angles;

S4: the brightness, saturation degree and the contrast metric that extract respectively described image;

S5: the fiducial value that obtains described value document according to the brightness of the light of described at least three angles, saturation degree and contrast metric;

S6: calculating the difference of described fiducial value and standard value, if difference in effective fluctuation range, identifies that described value document is true, otherwise is false.

Preferably,

Described method also comprises:

According to the standard value of the photometry basis of calculationJi value document of described at least three angles.

Preferably,

Described effective fluctuation range according to standard value document the maximal value under the irradiation of the light of different angles and minimum value determine.

Preferably,

Described step S3 comprises:

The light signal of the light of described at least three angles is converted to electric signal;

Described electric signal is amplified, obtain the electric signal identical with described reflected light code check;

To the described electric signal after amplifying convert obtain described in the image of light of at least three angles.

Preferably,

Described step S4 comprises:

The image of remembering the light of the first angle is F1={F11, F12 ..., F1n}, its characteristic image that comprises brightness Q11, saturation degree Q12 and contrast Q13 is F1{Q11, Q12, Q13};

$Q11=\frac{1}{n}\underset{j=1,\·\·\·,n}{\mathrm{\Σ}}F1j\·\·\·\left(1\right),$

$Q12=\frac{\underset{j=n_1,\·\·\·,n_m}{\mathrm{\Σ}}F1j}{\underset{j=1,\·\·\·,n}{\mathrm{\Σ}}F1j}\·\·\·\left(2\right),$

$Q13=\underset{j=b_1,\·\·\·,b_p}{\mathrm{\Σ}}F1j-\underset{j=s_1,\·\·\·,s_t}{\mathrm{\Σ}}F1j\·\·\·\left(3\right),$

Calculate and obtain F1{Q11, Q12, Q13} by formula 1,2 and 3;

Utilize the feature extracting method of the light of described the first angle to extract the image of the light that is left angle, the brightness of the light of at least three angles, saturation degree and contrast metric described in obtaining.

Preferably,

Described step S1 comprises:

Launch successively the light of three angles to value document.

Preferably,

Described step S5 comprises:

Brightness, saturation degree and the contrast metric of remembering the light of described three angles are respectively F1{Q11, Q12, Q13}, F2={Q21, Q22, Q23}, F3={Q31, Q32, Q33};

Carry out following computing: Q11-Q21=Φ 121, Q11-Q31=Φ 131, Q21-Q31=Φ 231, Q12-Q22=Φ 122, Q12-Q32=Φ 132, Q22-Q32=Φ 232, Q13-Q23=Φ 123, Q13-Q33=Φ 133, Q23-Q33=Φ 233;

Obtain the fiducial value R={ Φ 121 of described value document, Φ 131, Φ 231, Φ 122, Φ 132, Φ 232, Φ 123, Φ 133, Φ 233}.

The system of the value document photochromatic printing ink region truth identification that the embodiment of the present invention provides, comprising: multi-angle light emission module, Optical Receivers, memory module and light processing module;

Described multi-angle light emission module comprises the light transmitting submodule of at least three different angles and controls submodule, for from different perspectives to value document utilizing emitted light;

Described Optical Receivers comprises the light receiving element that several are installed perpendicular to reference field, is connected with described memory module, is sent to memory module for receiving the reflected light of described value document and described reflected light being obtained to digital picture by conversion;

Described memory module, is connected with described smooth processing module;

Described smooth processing module, for described digital picture is processed, and by the standard value of digital picture after treatment and standard value document to recently realizing the discriminating of value document.

Preferably,

Described light transmitting submodule comprises driving chip and light-emitting device, wherein said driving chip is processed for the electric signal sending according to described control submodule, and described light-emitting device is for launching modulated light signal according to described driving chip electric signal after treatment.

Preferably,

Described multi-angle light emission module comprises the light transmitting submodule of three different angles, wherein the first light transmitting submodule is vertical with reference field, and the angle direction of the second light transmitting submodule and the 3rd light transmitting submodule is in the both sides of described the first light transmitting submodule angle direction.

In the embodiment of the present invention, launch first successively the light of at least three angles to value document; Then the reflection of light light of at least three angles described in receiving successively; Then to described reflected light convert obtain described in the image of light of at least three angles; Then extract respectively brightness, saturation degree and the contrast metric of described image; Then obtain the fiducial value of described value document according to the brightness of the light of described at least three angles, saturation degree and contrast metric; Finally calculating the difference of described fiducial value and standard value, if difference in effective fluctuation range, identifies that described value document is true, otherwise is false.Gather the image information of value document inked areas by multi-angle, and the mode being analyzed, the method and system of value document photochromatic printing ink of the present invention region truth identification can identify forgery, adulterium or incomplete value document well, and then have strengthened the reliability to value document identification.

Brief description of the drawings

Fig. 1 is the method first embodiment process flow diagram of value document photochromatic printing ink of the present invention region truth identification;

Fig. 2 is the method second embodiment process flow diagram of value document photochromatic printing ink of the present invention region truth identification;

Fig. 3 is the structural representation of the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 4 is the structural representation of multi-angle light emission module 301 in the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 5 is the structural representation of multi-angle light emission module 301 in the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 6 is the direction schematic diagram of the first light transmitting submodule 30111 in the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 7 is the reflection schematic diagram of the first light transmitting submodule 30111 in the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 8 is the direction schematic diagram of the second light transmitting submodule 30112 in the system of value document photochromatic printing ink of the present invention region truth identification;

Fig. 9 is the reflection schematic diagram of the second light transmitting submodule 30112 in the system of value document photochromatic printing ink of the present invention region truth identification;

Figure 10 is the direction schematic diagram of the 3rd light transmitting submodule 30113 in the system of value document photochromatic printing ink of the present invention region truth identification;

Figure 11 is the reflection schematic diagram of the 3rd light transmitting submodule 30113 in the system of value document photochromatic printing ink of the present invention region truth identification.

Embodiment

The embodiment of the present invention provides the method and system of a kind of value document photochromatic printing ink region truth identification, gather the image information of value document inked areas by multi-angle, and the mode being analyzed, can well forgery, adulterium or incomplete value document be identified, and then strengthen the reliability to value document identification.

Refer to Fig. 1, in the embodiment of the present invention, the first embodiment of the method for value document photochromatic printing ink region truth identification comprises:

S1: light from least three angles to value document that launch successively;

Method of the present invention mainly adopts multi-angle to gather the image information of value document inked areas, and the mode being analyzed differentiates value document, therefore can be first successively to the light of at least three angles of value document transmitting.

The light of above-mentioned at least three angles can be the light of three angles, specifically can comprise the light that becomes A1, A2 and A3 angle with reference plane, wherein 0 ° of <A1<90 °, A1=90 °, 90 ° of <A3<180 °.

S2: the reflection of light light that receives successively at least three angles;

Utilizing emitted light arrives behind value document surface or reflects, and because the surface of value document is not absolute straight, therefore reflected light is dispersed, and can receive successively the reflection of light light from least three angles on value document surface.

S3: the image that reflected light is converted to the light that obtains at least three angles;

After receiving reflected light, can convert to reflected light the image of the light that obtains at least three angles.

S4: the brightness, saturation degree and the contrast metric that extract respectively image;

After obtaining image, can extract respectively brightness, saturation degree and the contrast metric of above-mentioned image.

S5: the fiducial value that obtains value document according to the brightness of the light of at least three angles, saturation degree and contrast metric;

After obtaining brightness, saturation degree and the contrast metric of image, can obtain according to the brightness of the light of at least three angles, saturation degree and contrast metric the fiducial value of value document.The standard value contrast of above-mentioned fiducial value for producing with standard value document, to differentiate the true and false of value document.

S6: calculating the difference of fiducial value and standard value, if difference in effective fluctuation range, identifies that value document is true, otherwise is false.

After obtaining fiducial value, can calculate the difference of fiducial value and standard value, if difference in effective fluctuation range, identifies that value document is true, otherwise be false.

Above-mentioned standard value can be preset after the light of at least three angles is determined, and need in the time of identification value document, not calculate, and is not construed as limiting herein.

Gather the image information of value document inked areas by multi-angle, and the mode being analyzed, the method of value document photochromatic printing ink of the present invention region truth identification can identify forgery, adulterium or incomplete value document well, and then has strengthened the reliability to value document identification.

Simply introduce the first embodiment of the method for value document photochromatic printing ink of the present invention region truth identification above, the second embodiment of the method to value document photochromatic printing ink of the present invention region truth identification is described in detail below, refer to Fig. 2, in the embodiment of the present invention, method second embodiment of value document photochromatic printing ink region truth identification comprises:

201: light from least three angles to value document that launch successively;

Method of the present invention mainly adopts multi-angle to gather the image information of value document inked areas, and the mode being analyzed differentiates value document, therefore can be first successively to the light of at least three angles of value document transmitting.

The light of above-mentioned at least three angles can be the light of three angles, specifically can comprise the light that becomes A1, A2 and A3 angle with reference plane, wherein 0 ° of <A1<90 °, A1=90 °, 90 ° of <A3<180 °.

202: the reflection of light light that receives successively at least three angles;

Utilizing emitted light arrives behind value document surface or reflects, and because the surface of value document is not absolute straight, therefore reflected light is dispersed, and can receive successively the reflection of light light from least three angles on value document surface.

203: the image that reflected light is converted to the light that obtains at least three angles;

After receiving reflected light, can convert to reflected light the image of the light that obtains at least three angles.Specifically can comprise the following steps: first the light signal of the light of at least three angles to be converted to electric signal; Then electric signal is amplified, obtain the electric signal identical with reflected light code check; Finally the electric signal after amplifying is converted the image of the light that obtains at least three angles.

It should be noted that, after obtaining view data, above-mentioned view data can be stored, be not construed as limiting herein.

204: the brightness, saturation degree and the contrast metric that extract respectively image;

After obtaining image, can extract respectively brightness, saturation degree and the contrast metric of above-mentioned image.

The detailed process of step 204 can be as follows:

The image of remembering the light of the first angle is F1={F11, F12 ..., F1n}, its characteristic image that comprises brightness Q11, saturation degree Q12 and contrast Q13 is F1{Q11, Q12, Q13};

$Q11=\frac{1}{n}\underset{j=1,\&CenterDot;\&CenterDot;\&CenterDot;,n}{\mathrm{\&Sigma;}}F1j\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right),$

$Q12=\frac{\underset{j=n_1,\&CenterDot;\&CenterDot;\&CenterDot;,n_m}{\mathrm{\&Sigma;}}F1j}{\underset{j=1,\&CenterDot;\&CenterDot;\&CenterDot;,n}{\mathrm{\&Sigma;}}F1j}\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right),$

$Q13=\underset{j=b_1,\&CenterDot;\&CenterDot;\&CenterDot;,b_p}{\mathrm{\&Sigma;}}F1j-\underset{j=s_1,\&CenterDot;\&CenterDot;\&CenterDot;,s_t}{\mathrm{\&Sigma;}}F1j\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right),$

Calculate and obtain F1{Q11, Q12, Q13}, wherein n by formula 1,2 and 3 ₁..., n _mrepresent sequence number corresponding to the maximum colorama of concentration, b ₁..., b _prepresent the highest sequence number corresponding to light of brightness, s ₁..., s _trepresent minimum sequence number corresponding to light of brightness;

Utilize the feature extracting method of the light of the first angle to extract the image of the light that is left angle, obtain brightness, saturation degree and the contrast metric of the light of at least three angles.For example method of the present invention is used the light time of three angles, and brightness, saturation degree and the contrast metric that can obtain the light of three angles are respectively F1{Q11, Q12, Q13}, F2={Q21, Q22, Q23}, F3={Q31, Q32, Q33}.

205: the fiducial value that obtains value document according to the brightness of the light of at least three angles, saturation degree and contrast metric;

After obtaining brightness, saturation degree and the contrast metric of image, can obtain according to the brightness of the light of at least three angles, saturation degree and contrast metric the fiducial value of value document.The standard value contrast of above-mentioned fiducial value for producing with standard value document, to differentiate the true and false of value document.

Method of the present invention is used the light time of three angles, and brightness, saturation degree and the contrast metric of the light of three angles can be respectively F1{Q11, Q12, Q13}, F2={Q21, Q22, Q23}, F3={Q31, Q32, Q33};

Carry out after following computing: Q11-Q21=Φ 121, Q11-Q31=Φ 131, Q21-Q31=Φ 231, Q12-Q22=Φ 122, Q12-Q32=Φ 132, Q22-Q32=Φ 232, Q13-Q23=Φ 123, Q13-Q33=Φ 133, Q23-Q33=Φ 233, can obtain the fiducial value R={ Φ 121 of value document, Φ 131, Φ 231, Φ 122, Φ 132, Φ 232, Φ 123, Φ 133, Φ 233}.

206: according to the standard value of the photometry basis of calculationJi value document of at least three angles.

By the standard value of the fiducial value of value document and standard value document relatively being differentiated to the true and false of value document, therefore need according to the standard value of the photometry basis of calculationJi value document of at least three angles.The concrete value document that can choose several normal circulations, gathers respectively its brightness, saturation degree and contrast metric, then calculates the standard value of standard value document.

For example method of the present invention is used the light time of three angles, can collect brightness, saturation degree and the contrast metric of standard value document, and the standard of utilizing method of interpolation can obtain this three classes image information specifically can be respectively M1={MQ11, MQ12, MQ13}, M2={MQ21, MQ22, MQ23}, M3={MQ31, MQ32, MQ33}.Calculate MQ11-MQ21=M Φ 121, MQ11-MQ31=M Φ 131, MQ21-MQ31=M Φ 231; MQ12-MQ22=M Φ 122, MQ12-MQ32=M Φ 132, MQ22-MQ32=M Φ 232; MQ13-MQ23=M Φ 123, MQ13-MQ33=M Φ 133, MQ23-MQ33=M Φ 233.Wherein M Φ=and M Φ 121, M Φ 131, M Φ 231, M Φ 122, M Φ 132, M Φ 232, M Φ 123, M Φ 133, M Φ 233} is tried to achieve standard value.

It should be noted that, step 206 can the arbitrary step before step 207 before or after, and be not limited to the embodiment of the present invention after step 205, do not limit at this.

207: calculating the difference of fiducial value and standard value, if difference in effective fluctuation range, identifies that value document is true, otherwise is false.

After obtaining fiducial value, can calculate the difference of fiducial value and standard value, if difference in effective fluctuation range, identifies that value document is true, otherwise be false.

Above-mentioned effective fluctuation range according to standard value document the maximal value under the irradiation of the light of different angles and minimum value determine.Concrete, suppose that effective fluctuation range is designated as η, the fiducial value of value document is R, the standard value of standard value document is M Φ, according to condition (1), value document is differentiated

$\left\{\begin{array}{c}\mathrm{if}\left|\right|R-\mathrm{M\&Phi;}\left|\right|<\mathrm{\&eta;},\mathrm{True}\\ \mathrm{if}\left|\right|R-\mathrm{M\&Phi;}\left|\right|>\mathrm{\&eta;},\mathrm{False}\end{array}\right.\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right);$

Can find out by formula, in the time that the tolerance of actual value and standard value is less than certain threshold value, value document is identified as very, otherwise is false.

Gather the image information of value document inked areas by multi-angle, and the mode being analyzed, the method of value document photochromatic printing ink of the present invention region truth identification can identify forgery, adulterium or incomplete value document well, and then has strengthened the reliability to value document identification.

The second embodiment of the method to value document photochromatic printing ink of the present invention region truth identification is described in detail above, particularly extract respectively brightness, saturation degree and the contrast metric of image and according to the process of the standard value of the photometry basis of calculationJi value document of at least three angles, introduce the system embodiment of value document photochromatic printing ink of the present invention region truth identification below, refer to Fig. 3 to Figure 11, in the embodiment of the present invention, the system embodiment of value document photochromatic printing ink region truth identification comprises:

Multi-angle light emission module 301, Optical Receivers 302, memory module 303 and light processing module 304;

Multi-angle light emission module 301 comprises the light transmitting submodule 3011 of at least three different angles and controls submodule 3012, for from different perspectives to value document utilizing emitted light;

Optical Receivers 302 comprises the light receiving element that several are installed perpendicular to reference field, is connected with memory module 303, is sent to memory module for receiving the reflected light of value document and reflected light being obtained to digital picture by conversion;

Memory module 303, is connected with light processing module;

Light processing module 304, for digital picture is processed, and by the standard value of digital picture after treatment and standard value document to recently realizing the discriminating of value document.

Preferably,

Light transmitting submodule 3011 comprises driving chip and light-emitting device, wherein drives chip to be used for processing according to the electric signal of controlling submodule transmission, and light-emitting device is used for according to driving chip electric signal after treatment to launch modulated light signal.

Preferably,

Multi-angle light emission module 301 comprises the light transmitting submodule 3011 of three different angles, wherein the angle direction of the first light transmitting submodule 30111, the second light transmitting submodules 30112 vertical with reference field and the 3rd light transmitting submodule 30113 is in the both sides of the first light transmitting submodule 30111 angle directions.

It is below a kind of embodiment of the system of value document photochromatic printing ink of the present invention region truth identification, in this embodiment, multi-angle light emission module 301 comprises the light transmitting submodule of three different angles, and the setting angle of Optical Receivers 302 is perpendicular to reference field.

Refer to Fig. 4, in the embodiment of the present invention, multi-angle light emission module 301 can comprise the light transmitting submodule 3011 of three different angles, three light transmitting submodule 3011 comprises respectively 11,21,31 ex hoc genus anne elements, the three even intervals of set of pieces are arranged, Zuo Liang Column Layout, three set of pieces institute setting angle differences, the light of transmitting different angles is to value document 5 surfaces.

Be respectively with reference to arrow direction shown in figure 5,12,22,32 direction of light that in light transmitting submodule 11,21,31, assembly is launched, the radiative principal direction of three set of pieces forms an angle to each other.With reference to figure 6, form the first light transmitting submodule 30111 with the element of arrow leading point, direction shown in arrow is light transmit direction.With reference to figure 7, light transmit direction and reference field vertical direction angle are α 1, and because value document 5 surfaces are not definitely smooth, therefore light is mapped to the backward all directions reflection of paper surface, and part light received by Optical Receivers 302.With reference to figure 8, form the second light transmitting submodule 30112 with the element of arrow leading point, direction shown in arrow is light transmit direction, vertical with reference field.With reference to figure 9, light transmit direction is vertical with reference field, and the light part that is transmitted into value document 5 surperficial back reflections is received by Optical Receivers 302.With reference to Figure 10, form the 3rd light transmitting submodule 30113 with the element of arrow leading point, direction shown in arrow is light transmit direction.With reference to Figure 11, light transmit direction and reference field vertical direction angle are α 2, and the light part that is transmitted into value document 5 surperficial back reflections is received by Optical Receivers 302.

Optical Receivers 302 comprises some sub-elements equally, but its setting angle is consistent, all installs perpendicular to reference field, forms a line, and receives the light of being returned by value document 5 surface reflections.Light is transmitted into the surperficial back reflection of value document 5, and because value document 5 surfaces are not definitely straight, therefore reflected light is dispersed, and wherein part reflected light is received by Optical Receivers 302.

Controlling submodule 3012 controls light first and launches submodule 30111 and work, input the electric signal of a constant bit rate and launch the modulated light signal of respective rate through the inner light-emitting device such as driving chip processing rear drive semiconductor laser or light emitting diode (LED), the angle of emission angle and benchmark vertical direction is α 1, is then radiated value document 5 surfaces.The light one way or another of value document 5 surface emitting is dispersed, and after the light signal input Optical Receivers 302 of a constant bit rate, is converted to electric signal by devices such as photodetection diodes, exports the electric signal of phase code rate after prime amplifier.Thus, optical pickup apparatus receives part reflected light, changes electric signal into by some photoelectric conversion devices, and then by the final generating digital image F1={F11 of conversion, F12 ..., F1n}, deposits memory module 303 in.

Control submodule 3012 by time delay command control, after the small time interval of starting working at the first light transmitting submodule 30111, control the second light transmitting submodule 30112 and work, launch the light signal vertical with reference field, be then radiated value document 5 surfaces.Equally rough due to value document 5 surfaces, Optical Receivers 302 receives part reflected light, changes the light signal receiving into digital signal by light activated element and induction installation, generating digital image F2={F21, F22 ... F2n}, deposits memory module 303 in.Control submodule 3012 again by time delay command control, after the small time interval of starting working at the second light transmitting submodule 30112, control the 3rd luminous subsystem 30113 and work, launching with benchmark vertical direction angle is the light of α 2, is then radiated value document 5 surfaces.Optical Receivers 302 receives part reflected light, changes the light signal receiving into digital signal by some light activated elements and induction installation, final generating digital image F3={F31, and F32 ..., F3n}, deposits memory module 303 in.

Light processing module 304 is then extracted respectively brightness, saturation degree and the contrast metric of image; Then obtain the fiducial value of value document 5 according to brightness, saturation degree and the contrast metric of the light of at least three angles; Finally calculating the difference of fiducial value and standard value, if difference in effective fluctuation range, identifies that value document 5 is true, otherwise is false.

Gather the image information of value document 5 inked areas by multi-angle, and the mode being analyzed, the system of value document 5 photochromatic printing ink region truth identification of the present invention can identify forgery, adulterium or incomplete value document 5 well, and then has strengthened the reliability that value document 5 is identified.

One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, program wherein can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.

Above the method and system of a kind of value document photochromatic printing ink provided by the present invention region truth identification are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. a method for value document photochromatic printing ink region truth identification, is characterized in that, comprising:

S1: light from least three angles to value document that launch successively;

S2: the reflection of light light of at least three angles described in receiving successively;

S3: to described reflected light convert obtain described in the image of light of at least three angles;

S4: the brightness, saturation degree and the contrast metric that extract respectively described image;

S5: the fiducial value that obtains described value document according to the brightness of the light of described at least three angles, saturation degree and contrast metric;

S6: calculating the difference of described fiducial value and standard value, if difference in effective fluctuation range, identifies that described value document is true, otherwise is false.

2. the method for value document photochromatic printing ink according to claim 1 region truth identification, is characterized in that, described method also comprises:

According to the standard value of the photometry basis of calculationJi value document of described at least three angles.

3. the method for value document photochromatic printing ink according to claim 1 region truth identification, is characterized in that, described effective fluctuation range according to standard value document the maximal value under the irradiation of the light of different angles and minimum value determine.

4. according to the method for the value document photochromatic printing ink region truth identification described in any one in claims 1 to 3, it is characterized in that, described step S3 comprises:

The light signal of the light of described at least three angles is converted to electric signal;

Described electric signal is amplified, obtain the electric signal identical with described reflected light code check;

To the described electric signal after amplifying convert obtain described in the image of light of at least three angles.

5. according to the method for the value document photochromatic printing ink region truth identification described in any one in claims 1 to 3, it is characterized in that, described step S4 comprises:

The image of remembering the light of the first angle is F1={F11, F12 ..., F1n}, its characteristic image that comprises brightness Q11, saturation degree Q12 and contrast Q13 is F1{Q11, Q12, Q13};

$Q11=\frac{1}{n}\underset{j=1,\&CenterDot;\&CenterDot;\&CenterDot;,n}{\mathrm{\&Sigma;}}F1j\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right),$

$Q12=\frac{\underset{j=n_1,\&CenterDot;\&CenterDot;\&CenterDot;,n_m}{\mathrm{\&Sigma;}}F1j}{\underset{j=1,\&CenterDot;\&CenterDot;\&CenterDot;,n}{\mathrm{\&Sigma;}}F1j}\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right),$

$Q13=\underset{j=b_1,\&CenterDot;\&CenterDot;\&CenterDot;,b_p}{\mathrm{\&Sigma;}}F1j-\underset{j=s_1,\&CenterDot;\&CenterDot;\&CenterDot;,s_t}{\mathrm{\&Sigma;}}F1j\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right),$

Calculate and obtain F1{Q11, Q12, Q13} by formula 1,2 and 3;

Utilize the feature extracting method of the light of described the first angle to extract the image of the light that is left angle, the brightness of the light of at least three angles, saturation degree and contrast metric described in obtaining.

6. the method for value document photochromatic printing ink according to claim 5 region truth identification, is characterized in that, described step S1 comprises:

Launch successively the light of three angles to value document.

7. the method for value document photochromatic printing ink according to claim 6 region truth identification, is characterized in that, described step S5 comprises:

Brightness, saturation degree and the contrast metric of remembering the light of described three angles are respectively F1{Q11, Q12, Q13}, F2={Q21, Q22, Q23}, F3={Q31, Q32, Q33};

Carry out following computing: Q11-Q21=Φ 121, Q11-Q31=Φ 131, Q21-Q31=Φ 231, Q12-Q22=Φ 122, Q12-Q32=Φ 132, Q22-Q32=Φ 232, Q13-Q23=Φ 123, Q13-Q33=Φ 133, Q23-Q33=Φ 233;

Obtain the fiducial value R={ Φ 121 of described value document, Φ 131, Φ 231, Φ 122, Φ 132, Φ 232, Φ 123, Φ 133, Φ 233}.

8. a system for value document photochromatic printing ink region truth identification, is characterized in that, comprising: multi-angle light emission module, Optical Receivers, memory module and light processing module;

Described multi-angle light emission module comprises the light transmitting submodule of at least three different angles and controls submodule, for from different perspectives to value document utilizing emitted light;

Described Optical Receivers comprises the light receiving element that several are installed perpendicular to reference field, is connected with described memory module, is sent to memory module for receiving the reflected light of described value document and described reflected light being obtained to digital picture by conversion;

Described memory module, is connected with described smooth processing module;

Described smooth processing module, for described digital picture is processed, and by the standard value of digital picture after treatment and standard value document to recently realizing the discriminating of value document.

9. the system of value document photochromatic printing ink according to claim 8 region truth identification, is characterized in that,

Described light transmitting submodule comprises driving chip and light-emitting device, wherein said driving chip is processed for the electric signal sending according to described control submodule, and described light-emitting device is for launching modulated light signal according to described driving chip electric signal after treatment.

10. the system of value document photochromatic printing ink region truth identification according to claim 8 or claim 9, is characterized in that,

Described multi-angle light emission module comprises the light transmitting submodule of three different angles, wherein the first light transmitting submodule is vertical with reference field, and the angle direction of the second light transmitting submodule and the 3rd light transmitting submodule is in the both sides of described the first light transmitting submodule angle direction.