CN112906843B - Anti-counterfeiting method and system based on infrared ray - Google Patents
Anti-counterfeiting method and system based on infrared ray Download PDFInfo
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- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
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Abstract
The invention relates to an anti-counterfeiting method and an anti-counterfeiting system based on infrared rays, wherein the method comprises the following steps: constructing an anti-counterfeiting pattern on a substrate, wherein the anti-counterfeiting pattern is composed of at least two graphic units, and the graphic units are used for generating interaction with infrared rays; arranging at least one infrared detector at a predetermined position; an infrared light source position matched with the preset position; the anti-counterfeiting identification of the anti-counterfeiting pattern is completed by identifying all the infrared patterns; when the infrared light source is positioned at a position of a certain infrared light source, infrared rays generated by the infrared light source interact with different graphic units to generate infrared patterns with different colors, and/or when the infrared light source is positioned at a position of different infrared light sources, infrared rays generated by the infrared light source interact with different graphic units to generate different infrared patterns. The invention can reduce the problems of cost, energy consumption and the like caused by using an artificial light source in the existing optical anti-counterfeiting technology, and simultaneously improve the portability and intelligence of the anti-counterfeiting technology.
Description
Technical Field
The invention belongs to the technical field of anti-counterfeiting, and particularly relates to an anti-counterfeiting method and system based on infrared rays.
Background
The problems of counterfeiting and badness of the existing products are always a challenge facing the world, and the problems are full of various aspects such as clothes, eating and housing in our lives, which not only cause economic loss, but also threaten human health (such as counterfeit and badness medicines, foods and the like). The advanced anti-counterfeiting technology is an important means for striking counterfeit and shoddy products. Among them, the optical anti-counterfeiting technology is a widely used technology for recognizing anti-counterfeiting patterns through interaction between light and the anti-counterfeiting patterns. In the identification process of the existing optical anti-counterfeiting technology, artificial light sources are often needed to provide light with specific wave bands, the use of the artificial light sources not only improves the cost and energy consumption of the anti-counterfeiting technology, but also has the problem that the light sources are not easy to carry, and thus, inconvenience is brought to the anti-counterfeiting process.
According to the blackbody radiation principle, any object with a temperature higher than absolute zero (0K) continuously radiates electromagnetic waves outwards. Human beings, as a homothermal animal, constantly maintain a body temperature of about 37 ℃ (310K), and therefore radiate electromagnetic waves from the outside. The electromagnetic wave radiated by the human body can be found to be mainly concentrated in a middle infrared band (3-25 mu m) by calculating the Planck distribution function, so that the human body is a natural infrared light source, and all parts including hands, faces and the like can be used as independent infrared light sources. For example, the existing infrared thermometric guns measure the body temperature of a human body in real time and in a non-contact manner by detecting infrared light radiated by the human body. Therefore, how to use infrared light emitted by a human body as a light source for anti-counterfeit identification is a technical problem to be urgently solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, an object of the present invention is to provide an infrared-based anti-counterfeiting method and system, which can reduce the problems of cost and energy consumption caused by using an artificial light source in the existing optical anti-counterfeiting technology, and improve the portability and intelligence of the anti-counterfeiting technology.
In a first aspect, the present invention provides an infrared-based anti-counterfeiting method, including:
constructing an anti-counterfeiting pattern on a substrate, wherein the anti-counterfeiting pattern is composed of at least two graphic units, and the graphic units are used for interacting with infrared rays;
arranging at least one infrared detector at a preset position for capturing an infrared pattern generated after the infrared ray interacts with the graphic unit;
the infrared light source position is matched with the preset position and used for placing an infrared light source so that the infrared detector captures at least one corresponding infrared pattern;
placing an infrared light source at the position of the infrared light source;
the anti-counterfeiting identification of the anti-counterfeiting pattern is completed by identifying all the infrared patterns;
when the infrared light source is positioned at a position of a certain infrared light source, infrared rays generated by the infrared light source interact with different graphic units to generate infrared patterns with different colors, and/or when the infrared light source is positioned at a position of different infrared light sources, infrared rays generated by the infrared light source interact with different graphic units to generate different infrared patterns.
Wherein, the infrared light source comprises a hand or any other parts of a human body.
Wherein the interaction comprises at least one or more of reflection, diffraction, interference, absorption, and transmission.
The anti-counterfeiting pattern at least comprises one or more of graphic units consisting of polymers or metal thin films with reflection or absorption effects on infrared rays, graphic units consisting of metal gratings with diffraction effects on infrared rays or graphic units consisting of multilayer film materials with interference effects on infrared rays.
When the anti-counterfeiting pattern comprises at least two graphic units which are made of polymers or metal films with the functions of reflecting or absorbing infrared rays, different materials of the graphic units have different reflectivity or absorptivity.
When the anti-counterfeiting pattern comprises at least two graphic units formed by metal gratings with diffraction effect on infrared rays, the metal gratings of different graphic units have different periods, orientations or duty ratios.
When the anti-counterfeiting pattern comprises at least two graphic units formed by multilayer film materials with interference effect on infrared rays, the multilayer film materials of different graphic units have different film thicknesses.
The anti-counterfeiting pattern is at least one or more of a two-dimensional code, a fingerprint, a character string, a character, a number or an image.
Wherein, through discerning whole infrared pattern is in order to accomplish the anti-fake discernment to anti-fake pattern, include:
one or more of two-dimensional code recognition of the infrared pattern, matching of the infrared pattern with a prestored reference infrared pattern or meaning recognition of the infrared pattern;
and finishing anti-counterfeiting identification according to the identification and/or matching result.
Wherein, the infrared detector is an infrared camera.
The substrate is made of paper materials, glass, silicon wafers, plastics or metals.
In a second aspect, the present invention further provides an anti-counterfeit system for implementing the above method, including:
an anti-counterfeiting pattern having an infrared pattern for interacting with infrared rays;
the infrared detector is used for capturing infrared patterns after the infrared rays interact with the anti-counterfeiting patterns;
and the identification unit is used for identifying the infrared pattern so as to finish the anti-counterfeiting identification of the anti-counterfeiting pattern.
Compared with the prior art, the anti-counterfeiting pattern is formed by different graphic units, so that the anti-counterfeiting pattern and infrared rays can form infrared patterns with different colors and shapes after interaction, and the anti-counterfeiting identification of the anti-counterfeiting pattern can be completed according to the difference of the colors and the shapes of the infrared patterns. The infrared ray generated by the human body can be used for identifying the anti-counterfeiting pattern, so that an artificial light source is not needed, the cost and the energy consumption of anti-counterfeiting identification can be reduced, and the operation is simpler; in addition, when the hand is adopted as an infrared light source, the device has portability, controllability and intelligence; and the controllability and the intelligence of the hand can improve the anti-counterfeiting grade of the anti-counterfeiting technology.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a flow chart illustrating a method for infrared-based anti-counterfeiting according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an infrared reflection based anti-counterfeiting mechanism according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating the effect of multi-level anti-counterfeiting according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a diffractive security device and its security effect according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the anti-counterfeiting effect of different duty cycles upon diffraction according to an embodiment of the invention;
FIG. 6 is a schematic diagram illustrating a security device with a variation in root mean square contrast according to an embodiment of the invention;
fig. 7 is a schematic diagram illustrating an anti-counterfeiting system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in articles or devices comprising the element.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example one
Referring to fig. 1, an embodiment of the present invention provides an infrared-based anti-counterfeiting method, including:
constructing an anti-counterfeiting pattern on a substrate, wherein the anti-counterfeiting pattern is composed of at least two graphic units, the graphic units are used for generating interaction with infrared rays, and preferably, the substrate is made of paper materials, glass, silicon wafers, plastics or metals;
arranging at least one infrared detector at a predetermined position for capturing an infrared pattern generated by the interaction of the infrared rays and the graphic unit, preferably, the infrared detector is an infrared camera;
the infrared source position is matched with the preset position and used for placing an infrared source so that the infrared detector captures at least one corresponding infrared pattern;
placing an infrared light source at the position of the infrared light source, wherein the infrared light source comprises a hand or any other part of a human body;
the anti-counterfeiting identification of the anti-counterfeiting pattern is completed by identifying all the infrared patterns;
wherein, when the infrared light source is positioned at a position of a certain infrared light source, the infrared rays generated by the infrared light source interact with different graphic units to generate infrared patterns with different colors and/or,
when the infrared light source is positioned at different infrared light source positions, infrared rays generated by the infrared light source interact with different graphic units to generate different infrared patterns; in addition, the infrared patterns with different colors can also have differences of different shapes, different directions and the like; different infrared patterns indicate that the infrared patterns generated by the infrared light sources at different positions do not appear simultaneously, and may have differences in shape, direction, color, and the like.
According to the embodiment of the invention, the anti-counterfeiting pattern is formed by different graphic units, so that the anti-counterfeiting pattern and the infrared ray interact to form the infrared pattern with different colors, shapes and directions, and the anti-counterfeiting identification of the anti-counterfeiting pattern can be completed according to the difference of the colors, shapes and directions of the infrared pattern. The infrared ray generated by the human body can be used for identifying the anti-counterfeiting pattern, so that an artificial light source is not needed, the cost and the energy consumption of anti-counterfeiting identification can be reduced, and the operation is simpler; in addition, when the hand is used as an infrared light source, the device has portability, controllability and intelligence; and the controllability and the intelligence of the hand can improve the anti-counterfeiting grade of the anti-counterfeiting technology.
The embodiment of the invention provides an anti-counterfeiting mechanism based on infrared reflection so as to prove the application of an infrared light source (taking a hand as an example). Invisible patterns (samples) composed of materials of different infrared reflectivity become visible under illumination with the hand as the infrared light source. The difference in infrared radiation intensity between the hand and the background environment plays a key role. In the process of anti-counterfeiting identification, infrared detectors capture infrared signals from different areas of a sample. This infrared signal includes infrared light from the sample's particular area itself (arrows a and a1 in fig. 2) and reflected hand (arrows b and b1 in fig. 2). The difference in the infrared signals of different areas of the sample allows the corresponding anti-counterfeiting pattern to be identified. In the case where no hand is used as the infrared light source (as shown in a in fig. 2), the low reflection region (L in fig. 2) and the high reflection region (H in fig. 2) in the sample are in a temperature equilibrium state with the background, so that the infrared signals of different regions are the same, and the infrared detector cannot identify the anti-counterfeiting pattern. When the hand is used as a light source (as shown in A1 in fig. 2), infrared radiation of the hand is reflected by all the regions, and thus an infrared signal of a region having a high reflectance is stronger than that of a region having a low reflectance, so that the forgery-preventing pattern can be recognized by an infrared detector.
Example two
On the basis of the first embodiment, the present embodiment may further include the following:
when the anti-counterfeiting pattern is arranged, the anti-counterfeiting pattern can be at least one or more of a two-dimensional code, a fingerprint, a character string, a character, a number or an image. In an application scenario, when the anti-counterfeiting pattern is one or more of a two-dimensional code, a character string, a character, a number or an image, the anti-counterfeiting pattern is formed by one or more of a graphic unit with a reflection or absorption effect on infrared rays, a graphic unit with an interference effect on infrared rays or a graphic unit with a diffraction effect on infrared rays. In another application scenario, when the anti-counterfeiting pattern is a fingerprint, the anti-counterfeiting pattern is formed only by the graphic units having a reflection effect on infrared rays.
Corresponding to the anti-counterfeiting patterns, when the graphic unit interacts with the infrared ray, the interaction at least comprises one or more of reflection, diffraction, interference, absorption and transmission, and when the interaction between the graphic unit and the infrared ray is in different modes, conditions such as a specific position of an infrared light source and the like are changed, so that the display of all anti-counterfeiting patterns can be completed only by changing various conditions during anti-counterfeiting identification, namely, multiple identification can be performed by combining various anti-counterfeiting patterns, and the identification accuracy and the use range can be greatly improved. In an application scenario, the graphic unit in the embodiment of the present invention may further include a graphic recognized by a visible light, raman, magnetic field, or electric field detection device.
EXAMPLE III
On the basis of the above embodiment, the present embodiment may further include the following:
when the anti-counterfeiting identification is carried out through the anti-counterfeiting pattern formed by the graphic units, the anti-counterfeiting pattern at least comprises one or more of the graphic units formed by polymers or metal thin films with reflection or absorption effects on infrared rays, the graphic units formed by metal gratings with diffraction effects on infrared rays or the graphic units formed by multilayer film materials with interference effects on infrared rays. When the security pattern is formed by a plurality of graphic elements of different principles of action (reflection, diffraction, interference, absorption or transmission), a multiple recognition effect can be achieved (see the contents of the graphic elements). When the anti-counterfeiting pattern is formed by a plurality of graphic units with the same action principle, the embodiment of the invention can also achieve the effect of multiple recognition by changing the conditions of the material, the period, the orientation, the duty ratio, the thickness and the like of the graphic units. In an application scenario, when the anti-counterfeit pattern includes at least two graphic units formed by polymer or metal thin film having reflection or absorption effect on infrared rays, different materials of the graphic units have different reflectivity or absorption rate, and the different reflectivity or absorption rate can make the infrared pattern captured by the infrared detector have different colors, the principle is as follows:
in infrared thermography, an infrared detector receives infrared radiation L from a sample (an object above absolute zero) that contains both the infrared emission of the sample itself and its reflected infrared light. The infrared radiation L of the sample can be calculated by the following formula:
in the formula, epsilon 1 Emissivity of the sample, T 1 Is the temperature of the sample, R 1 Is the reflectance, T, of the sample 2 λ is the range of infrared light wavelengths (λ) detectable by an infrared camera, which is the temperature of the object it reflects 1 ，λ 2 ) Taking a commonly used infrared camera as an example, λ 1 ＝7.5μm，λ 2 =14 μm, and the present embodiment assumes that the object it reflects is a black body, L λ (T) is the infrared intensity radiated by the black body along a unit solid angle at an absolute temperature T and a particular wavelength λ. The above formula includes both the infrared light emitted by the sample itself and the infrared light of the object it reflects.
According to kirchhoff's law, the emissivity of an object is equal to the absorptivity of the object:
ε＝α
where α is the absorption rate of the object.
Wherein the absorption (α) of the object is related to the transmittance (t) and the reflectance (R) by the formula:
α+R+t＝1
as can be seen from the above equation, if the transmittance of the object is 0, the relationship between the emissivity and the reflectivity is obtained as follows:
ε＝α＝1-R
when the transmittance of the object is 0, the formula of the infrared radiation L is obtained by combining the formula of the infrared radiation L and the formula of the absorptivity:
as can be seen from the above formula, for a security pattern, the pattern is represented by the reflectance (R) 1 ) The different parts are composed. If the background temperature and the sample (graphic cell) temperature are the same (T1 = T2), the rightmost term of the formula is 0, and thus the reflectance (R) is obtained by the formula for the infrared radiation L with the transmittance of 0 1 ) No influence is exerted on the infrared radiation L. That is, when the infrared light source (for example, a hand) is not used, the background temperature is the ambient temperature, and the anti-counterfeiting pattern composed of different reflectivities cannot be recognized if the background temperature is the same as the sample temperature. When an infrared light source (e.g., a hand) is used, since the temperature of the hand tends to be higher than room temperature (ambient temperature), the hand serves as a background temperature T under such conditions 2 Is the temperature of the hand, i.e. the background temperature T 2 Specific sample temperature T 1 At this time, the infrared radiation L of different areas (different graphic units) of the anti-counterfeiting pattern is determined by the reflectivity, the infrared radiation of the areas with higher reflectivity is stronger, the infrared radiation of the areas with lower reflectivity is weaker, the intensity of the infrared radiation signal can be recognized by an infrared detector, and the infrared pattern with different color changes can be displayed by the difference of false colors, namely, the different colors can achieve the aim of multiple recognition.
In a practical application scenario, the thickness of Polydimethylsiloxane (PDMS) can be regulated to form an anti-counterfeiting pattern, and the multi-stage color anti-counterfeiting can be realized by the difference of the thicknesses. When infrared light propagates in PDMS, the infrared light will be absorbed by chemical bonds in the PDMS. Thicker PDMS will absorb more infrared light, resulting in a reduction in reflected infrared light. When a hand is used as a light source, the thinner PDMS areas reflect more infrared light. The intensity of the infrared signal caused by the thickness can be recognized by the infrared detector and shows a change in different colors as a difference in false color, as shown by D in fig. 3. And the infrared signal change caused by the thickness provides possibility for multilevel color anti-counterfeiting. In the picture D in fig. 3, this embodiment sets the thickness of PDMS of the butterfly portion to 2.71 microns, the thickness of the flower to 0.68 microns, and the thickness of the leaf to 54.90 microns. When the hand is used as an infrared light source, different parts present different colors.
In addition to multi-level information encryption/decryption, the present embodiment may also implement unclonable encryption, for example, unclonable encryption using complex templates, such as fingerprinting (shown as E in fig. 3). In this embodiment, a PDMS thin film (having a thickness of 7.37 μm) may be coated on an aluminum substrate by a spin coating method, a thumb is lightly pressed on the PDMS, and then completely cured to generate a fingerprint pattern. Local variations in thickness can form on the PDMS surface. Such thickness variation causes difference in infrared reflectance, thereby realizing fingerprint recognition. In addition to using fingerprints as templates for unclonable encoding, random patterns with physical unclonable functions may also be integrated into the anti-counterfeiting patterns of embodiments of the present invention to achieve anti-counterfeiting and information encryption. As shown at F in fig. 3, the random security pattern is generated by a spray coating process that rapidly evaporates the solvent.
In another application scenario, when the anti-counterfeiting pattern comprises at least two graphic units formed by metal gratings having diffraction effects on infrared rays, the metal gratings of different graphic units have different periods, orientations or duty ratios, wherein the different periods or orientations have different incident angles, that is, infrared light sources (for example, hands) at different positions can form infrared patterns corresponding to the positions, and the infrared patterns formed by the diffraction of the infrared light sources at different positions can correspond to multiple identifications, so that the anti-counterfeiting grade and reliability can be further improved, and the gratings at different periods or orientations can be combined to form more complex anti-counterfeiting patterns.
As shown in fig. 4, in an actual application scenario, in this embodiment, two metal gratings (two metal gratings correspond to two graphic units) with mutually perpendicular orientations are selected to form an anti-counterfeit pattern (as shown in a in fig. 4), where the anti-counterfeit pattern is formed by overlapping a letter "T" and a letter "H", and the orientations of the metal gratings forming the letter "T" and the letter "H" are mutually perpendicular. Due to the different orientations of the metal gratings, the hand (infrared light source) needs to be placed at different positions to enable the infrared rays diffracted by the specific pattern unit to be recognized by the infrared detector. When the hand is placed in position 1 (shown as a in fig. 4), the pattern "T" is displayed (shown on the left side of b in fig. 4); when the hand is placed in position 2 (shown as a in fig. 4), the pattern "H" is displayed (shown on the right side of b in fig. 4). In practical applications, the specific position of the hand can also be distributed to a specific user as a key, and only when the hand is placed at the specific position, the correct information can be identified. The user without the key may recognize the pattern information but cannot confirm whether the pattern information is correct, thereby improving the level of anti-counterfeiting.
In the embodiment of the invention, besides the influence of the period and orientation of the metal grating on the incident angle, the duty ratio of the metal grating also influences the diffraction intensity, thereby realizing the aim of multi-level color anti-counterfeiting. The duty cycle is defined as the line width of the grating divided by the period. The efficiency of the grating for diffracting infrared rays is changed along with the change of the duty ratio, so that the intensity of the diffracted infrared rays is influenced, and the diffraction intensity is increased along with the increase of the duty ratio under the condition that the duty ratio is less than 60% (the period is kept unchanged). Based on the principle, as shown in fig. 5, in the present embodiment, three gratings (three metal gratings G1, G2, and G3 shown in the upper part of fig. 5) with the same period and different duty ratios are provided, and a two-dimensional code pattern is formed by the three gratings (three metal gratings G1, G2, and G3 shown in the lower part of fig. 5 correspondingly form an integral pattern of an infrared pattern), and when a hand is placed on one side of a sample as a light source, the infrared camera can recognize the two-dimensional code and the colors of different parts of the two-dimensional code are different; just because it has the difference of colour more than traditional two-dimensional code, has resulted in comparing and has had one more level anti-fake in traditional two-dimensional code, has actually constituted a three-dimensional code.
In a further application scenario, when the security pattern comprises at least two graphic elements made of a multilayer film material having an interference effect on infrared light, the multilayer film materials of different graphic elements have different film thicknesses. Taking the single-layer film as an example, if the thickness of the single-layer film is 1/4 of the wavelength of incident light, destructive interference occurs between infrared light reflected by the surface of the single-layer film and infrared light reflected by the substrate, and the intensity of reflected light is suppressed; if the thickness of the single-layer film is 1/2 of the wavelength of the incident light, interference and constructive effects occur between the infrared light reflected by the surface of the single-layer film and the infrared light reflected by the substrate, increasing the intensity of the reflected light, and thus the intensity of the captured infrared light can be adjusted by thickness adjustment. Compared with a single-layer film, the multilayer film can realize the regulation and control of interference by regulating the thickness in a wide waveband, infrared patterns with different colors (different intensities) can be formed on films with different thicknesses, and the infrared signal change caused by the thickness provides one-level more color anti-counterfeiting than single-color anti-counterfeiting.
Example four
On the basis of the above embodiment, the present embodiment may further include the following:
when the anti-counterfeiting identification of the anti-counterfeiting pattern is finished, the embodiment of the invention can finish the anti-counterfeiting identification of the anti-counterfeiting pattern by identifying all infrared patterns, and comprises the following steps:
one or more of two-dimensional code recognition of the infrared pattern, matching of the infrared pattern with a prestored reference infrared pattern or meaning recognition of the infrared pattern;
and finishing anti-counterfeiting identification according to the identification and/or matching result.
In an application scene, when the two-dimension code recognition is carried out on the infrared pattern, the two-dimension code recognition can be completed through recognition equipment such as a mobile phone, and the anti-counterfeiting recognition of the anti-counterfeiting pattern can be completed according to the recognized content. The two-dimensional code of the embodiment of the invention forms the anti-counterfeiting pattern by spraying PDMS with low infrared reflectivity on the surface of an aluminum sheet with high infrared reflectivity. The method comprises the steps of firstly diluting PDMS in n-hexane, and then forming the anti-counterfeiting pattern in a spraying mode. Wherein, the infrared reflectivity of the aluminum sheet is up to 99%, while the PDMS film sprayed on the aluminum has lower reflectivity due to the infrared absorption of various chemical bonds in the PDMS, and the measured average reflectivity is 41.2%.
In order to further embody the anti-counterfeiting effect achieved by taking infrared rays as a light source, the two-dimensional code anti-counterfeiting pattern prepared by the method is compared with visible light. In an actual application scenario, the present embodiment uses the FLIR T620 camera to identify the anti-counterfeit pattern; the resolution of the camera was 640 x 480, the power of the LED lamp used in the visible mode was 1.2W, and in order to keep the hand as an infrared source with the same power as the LED, the infrared radiation intensity M of the hand was first calculated from the planck distribution function λ (T) d λ, which is calculated by the formula:
in the formula, M λ (T) spectral radiant flux density, h =6.626 × 10 -34 J "s is planck constant, c =2.998 × 108 m" s -1 K =1.38 × 10, which is the propagation speed of light in vacuum -23 J〃K -1 Is the boltzmann constant, λ is the wavelength of light, T is the absolute temperature (K) of the object, 310K for the hand. The corresponding infrared radiation intensity of the hand is obtained by integrating the wavelength of the formula from 7.5 mu m to 14 mu m and multiplying the integrated wavelength by the emissivity of 0.98, and the infrared radiation intensity of the hand is 212W/m 2 . In order to make the radiation power of the hand consistent with that of the LED lamp (1.2W), the radiation area of the hand should be 60cm 2 . The area of the hand of the person is more than 150cm 2 . Therefore, this embodiment employs forming a 60cm aluminum foil 2 Then wrap up the aluminium foil and carry out the experiment on hand, wherein, the position when hand and LED lamp radiate is the same to and the hand equals with camera to the distance of anti-fake pattern, and the camera is located the infrared ray warp of hand radiationOn the path after the anti-counterfeiting pattern is reflected.
In order to quantitatively compare the effects of different recognition modes (visible light and infrared light), the present embodiment converts all the photos taken by the camera into grayscale photos and then calculates the root mean square contrast of the photos, which is expressed by the following formula:
in the formula I ij The gray value of the (i, j) th pixel point in the picture, the size of the picture is M multiplied by N,
the gray value is normalized to 0 to 1 in this embodiment, and the calculated root mean square contrast is in a range of 0 to 0.5.
In order to quantify the identification effect, the mobile phone is adopted to scan two-dimensional codes with different root mean square contrasts, if information can be scanned, the two-dimensional codes can be identified, otherwise, the two-dimensional codes cannot be identified. The threshold value for obtaining the rms contrast of the recognizable picture according to the recognizable and unrecognizable threshold values is 0.042, as shown in fig. 6, the D part is the rms contrast of the recognizable picture, and the U part is the rms contrast of the unrecognizable picture.
According to the embodiment of the invention, the root mean square contrast calculation formula is adopted, and in the visible light mode, if the LED light source is not used, the root mean square contrast corresponding to the picture shot by the camera is 0.020, which indicates that the anti-counterfeiting pattern is difficult to identify. When the LED light source is used, the root mean square contrast corresponding to the picture shot by the camera is increased to 0.035, the effect is improved by nearly one time, but the anti-counterfeiting pattern is still difficult to identify, because the PDMS is transparent, the pattern is difficult to identify under the visible light condition. When the hand is used as an infrared light source, the root mean square contrast of the obtained infrared image is increased to 0.251 which is far larger than a recognizable critical value (0.042), namely, the root mean square contrast of the recognized infrared image in the embodiment is larger than the critical value of 0.042, so that the image can be clearly recognized when infrared rays are used as the light source for anti-counterfeiting recognition.
EXAMPLE five
As shown in fig. 7, this embodiment further provides an anti-counterfeit system for implementing the above method, including:
a forgery prevention pattern 1 having an infrared pattern for interacting with infrared rays;
the infrared detector 2 is used for capturing infrared patterns after the infrared rays interact with the anti-counterfeiting patterns;
and the identification unit is used for identifying the infrared pattern so as to complete the anti-counterfeiting identification of the anti-counterfeiting pattern.
Example six
The disclosed embodiments provide a non-volatile computer storage medium having stored thereon computer-executable instructions that can perform the method steps of the above embodiments.
It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
The computer readable medium may be embodied in the electronic device; or may be separate and not incorporated into the electronic device.
Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local Area Network (AN) or a Wide Area Network (WAN), or the connection may be made to AN external computer (for example, through the internet using AN internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Where the name of an element does not in some cases constitute a limitation on the element itself.
The foregoing describes preferred embodiments of the present invention, and is intended to make the spirit and scope of the present invention clear and understandable, but not to limit the present invention, and modifications, substitutions and improvements made within the spirit and principle of the present invention are included in the scope of the present invention as outlined by the appended claims.
Claims (7)
1. An infrared-based anti-counterfeiting method is characterized by comprising the following steps:
constructing an anti-counterfeiting pattern on a substrate, wherein the anti-counterfeiting pattern is composed of at least two graphic units, and the graphic units are used for generating interaction with infrared rays;
arranging at least one infrared detector at a preset position for capturing an infrared pattern generated after the infrared ray interacts with the graphic unit;
the infrared light source position is matched with the preset position and used for placing an infrared light source so that the infrared detector captures at least one corresponding infrared pattern; the infrared light source comprises a hand or any other part of a human body;
placing an infrared light source at the position of the infrared light source;
the anti-counterfeiting identification of the anti-counterfeiting pattern is completed by identifying all the infrared patterns;
the infrared ray generated by the infrared light source interacts with different graphic units to generate different infrared patterns;
the anti-counterfeiting pattern at least comprises a graphic unit formed by a polymer or a metal thin film with reflection or absorption effect on infrared rays, a graphic unit formed by a metal grating with diffraction effect on the infrared rays and a graphic unit formed by a multilayer film material with interference effect on the infrared rays;
at least two pattern units are arranged, wherein the pattern units are composed of metal gratings which have diffraction effect on infrared rays, the metal gratings of different pattern units have different periods or orientations, and the infrared patterns corresponding to the positions of the metal gratings are formed by diffraction of the infrared light sources at different positions;
the anti-counterfeiting identification of the anti-counterfeiting pattern is completed by identifying all the infrared patterns, and the method comprises the following steps:
one or more of two-dimensional code recognition of the infrared pattern, matching of the infrared pattern with a prestored reference infrared pattern or meaning recognition of the infrared pattern;
and finishing anti-counterfeiting identification according to the identification and/or matching result.
2. The method of claim 1, wherein the interaction comprises at least a plurality of reflection, diffraction, interference, absorption, and transmission.
3. The method according to claim 1, wherein when the security device comprises at least two graphic elements formed of a polymer or metal film having an infrared-reflecting or absorbing effect, different materials of the graphic elements have different reflectivities or absorptivities.
4. The method of claim 1, wherein the metal gratings of different ones of the graphics primitives have different duty cycles.
5. The method of claim 1, wherein when the security device comprises at least two graphic elements made of a multilayer film material having an interference effect on infrared rays, the multilayer film materials of different graphic elements have different film thicknesses.
6. The method of claim 1, wherein the security device is at least one of a two-dimensional code, a fingerprint, a character string, a letter, a number, or an image.
7. An anti-counterfeiting system for implementing the method according to any one of claims 1 to 6, comprising:
an anti-counterfeiting pattern having an infrared pattern for interacting with infrared rays;
the infrared detector is used for capturing infrared patterns after the infrared rays interact with the anti-counterfeiting patterns;
and the identification unit is used for identifying the infrared pattern so as to complete the anti-counterfeiting identification of the anti-counterfeiting pattern.
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| AU2011100778B4 (en) * | 2011-06-29 | 2011-10-13 | Ccl Secure Pty Ltd | Improvements in security devices incorporating colour shifting inks |
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