JP3645206B2 - Counterfeit discrimination device and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a counterfeit for discriminating the authenticity of a discrimination object that always needs to be discriminated, such as banknotes, securities, passports, etc. The present invention relates to a discrimination apparatus and method, and more particularly, to a counterfeit discrimination apparatus and method for discriminating the authenticity of paper sheets that are printed with fluorescent ink that emits fluorescence when irradiated with light in the ultraviolet region.
[0002]
[Prior art]
Conventionally, as an apparatus for discriminating the authenticity of a paper sheet that has been printed with fluorescent ink that emits fluorescence when irradiated with light in the ultraviolet region (ultraviolet light), for example, Japanese Patent No. 2515250 There are some which are described in 7-311866 gazette. The apparatus described in the above-mentioned publication uses an image (fluorescence image) obtained by irradiating a paper sheet with ultraviolet light by an ultraviolet light source (for example, a UV lamp) disposed inside the apparatus as an image of a CCD camera or the like. The authenticity of the paper sheet is discriminated by visually observing the fluorescent image taken by the photographing means and displayed on the display unit.
[0003]
[Problems to be solved by the invention]
However, the fluorescence emitted from a paper sheet by irradiating with ultraviolet light changes its spectrum, that is, its color (fluorescent color) depending on the temperature. In addition, the color of ultraviolet light emitted from an ultraviolet light source such as a UV lamp also varies depending on the temperature. In short, there is a problem that the fluorescent image of the photographed paper sheet changes greatly depending on the temperature when the apparatus is used (that is, when the fluorescent image of the paper sheet is photographed). .
[0004]
In spite of such problems, in any of the above-described apparatuses, the fluorescence image used to discriminate the authenticity of paper sheets does not take into account the above-described influence of temperature. Therefore, a fake paper sheet may be mistakenly determined as a real paper sheet, leading to a decrease in discrimination accuracy.
[0005]
In addition, in recent years, especially paper counterfeit technology such as banknotes and passports has become more sophisticated than ever before, real paper sheets up to the part printed with fluorescent ink on real paper sheets. In the same way as described above, if imitated by a fake paper sheet, even if the discrimination device as described above is used, there is a possibility that the authenticity of the paper sheet as the discrimination object cannot be discriminated at all.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to obtain a highly reliable and reproducible fluorescent image in any case without being affected by the environmental temperature. Therefore, it is an object of the present invention to provide a counterfeit discrimination apparatus and method capable of performing true / false discrimination with higher accuracy than before.
[0007]
[Means for Solving the Problems]
The present invention relates to a counterfeit discrimination apparatus and method for discriminating the authenticity of an object to be discriminated, such as banknotes and passports.
[0008]
With respect to the counterfeit discrimination device, the object of the present invention is to provide a counterfeit discrimination device for discriminating the authenticity of the discrimination object, an ultraviolet light source for irradiating the discrimination object with light in the ultraviolet region, and an image photographing means for taking an image. And a temperature measuring means for measuring the environmental temperature of the object to be identified, and a correlation between the color information of the fluorescence emitted by the reference phosphor that receives the light in the ultraviolet region and emits fluorescence in a predetermined color, and the temperature When storing a fluorescent color temperature correlation function as a function, and irradiating the discrimination target object with light in the ultraviolet region by the ultraviolet light source and taking a fluorescent image of the discrimination target object with the image taking means, A fluorescence image correcting unit that corrects the fluorescence image of the object to be identified based on the environmental temperature measured by the temperature measuring unit and the fluorescence color temperature correlation function stored in the storage unit. It is achieved by. Further, the image display means for displaying the fluorescence image corrected by the fluorescence image correction means, or further provided with an infrared light source and a visible light source, the infrared image and the full-color image of the discrimination object are obtained. The authenticity of the discrimination object is discriminated from the fluorescence image captured by the image capturing unit and corrected by the fluorescence image correcting unit, the captured infrared image, and the captured full-color image. This is achieved more effectively.
[0009]
On the other hand, regarding the counterfeit discrimination method, the above object of the present invention is used in a counterfeit discrimination device including an ultraviolet light source that irradiates the discrimination target with light in the ultraviolet region and an image photographing unit that captures an image. A fluorescent color temperature which is a correlation function between the color information and temperature of the fluorescence emitted by a reference phosphor which receives light in the ultraviolet region and emits fluorescence with a predetermined color. A storage step of calculating and storing a correlation function; a temperature measuring step of measuring an environmental temperature of the identification object; and irradiating the identification object with light in the ultraviolet region by the ultraviolet light source; Based on the ambient temperature measured in the temperature measurement step and the fluorescent color temperature correlation function stored in the storage step when capturing a fluorescent image of the discrimination target, It is accomplished by having the fluorescent image correcting step of correcting the fluorescence image of another object.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0011]
FIG. 1 is a schematic diagram showing an example of an external configuration of a forged discrimination device according to the present invention. As shown in FIG. 1, the counterfeit discrimination device 1 includes a control personal computer 10 (hereinafter referred to as a control PC) and a scanner-type image capturing device 20. The control PC 10 and the image capturing device 20 are connected so that they can communicate with each other. The image capturing device 20 includes a first structure portion 21 and a second structure portion 22. The horizontal surface (transparent glass structure) at the top of the second structure part 22 becomes a discrimination object placing part 23 for placing a discrimination object.
[0012]
FIG. 2 is a block diagram showing an example of the internal configuration of the counterfeit discrimination device 1 having the external configuration as shown in FIG.
[0013]
That is, as shown in FIG. 2, the control PC 10 has its own central processing unit (CPU) CPU 100, a fluorescent color temperature correlation function 111, and a fluorescent image correction program 112 based on a fluorescent image correction formula described later. A fluorescent color temperature correction unit 110 having a memory, a memory 120 for storing information such as necessary data, programs and captured images, a display unit 11 for displaying images and necessary information, and a necessary operation. Keyboard 12 and a communication I / F 130.
[0014]
The PC-side CPU 100 controls the whole counterfeit discrimination device. The communication I / F 130 is a means for the counterfeit discrimination device 1 to exchange information with the outside. In short, the collected I / F 130 transmits the collected image to the outside, or a real discrimination target (for example, a real banknote or Used when downloading image data such as passports and necessary information from outside. Needless to say, the fluorescence color temperature correlation function 111 and the fluorescence image correction program 112 are stored in the memory 120.
[0015]
On the other hand, the image capturing device 20 includes a device control CPU 200 for controlling a CCD camera and a motor provided in the image capturing device 20, an amplification amplifier and an A / D converter for output of the CCD camera, and temporary storage of images. An image processing block 210 including a memory, a CCD camera control block 220 having a timing generator of the CCD camera, a CCD camera 230, a motor 240 for driving an image reading head, a transmission light source head, and the like; A light source control block including a light source control CPU 300 that controls a light source (in this example, a UV lamp, a xenon lamp, and an LED array) and a switching circuit for each light source (in this example, a UV lamp, a xenon lamp, and an LED array). 310, a UV lamp 320 as a light source for fluorescent images, -Measure the xenon lamp 330, which is a light source for images, the LED array 340, which is a light source for infrared images, and the ambient temperature of the object to be identified (in short, the outside temperature of the place where the object to be identified is exposed). Temperature sensor 350. Note that the temperature sensor 350 is installed at a position away from each light source in order to measure only the environmental temperature of the object to be identified while eliminating the temperature of each light source itself.
[0016]
The device control CPU 200 is controlled by the PC-side CPU 100. The temperature sensor 350 is preferably a thermistor. Here, as the LED array 340, an infrared LED array composed of infrared LEDs that emit three different wavelengths in the infrared region is used, but more types of wavelengths may be used. .
[0017]
FIG. 3 is a schematic diagram for explaining the optical system of the counterfeit discrimination device according to the present invention. As shown in FIG. 3, the optical system of the counterfeit discrimination device 1 includes a transmissive light source head 400 and an image reading head 500. Structurally, the transmissive light source head 400 is attached to the first structure portion 21 shown in FIG. 1, and the image reading head 500 is attached to the second structure portion 22 shown in FIG.
[0018]
The transmission light source head 400 includes a xenon lamp 410 that is a light source for transmitting a transmission image, a diffuser plate 420 that is installed in front of the xenon lamp 410 in order to make the light from the xenon lamp 410 uniform, and an infrared cut filter. 430 and a UV cut filter 440. The infrared cut filter 430 plays a role of cutting the infrared light of the xenon lamp 410 that affects the image quality when a full-color image is taken. The UV cut filter 440 plays a role of cutting the fluorescence emitted by the xenon lamp 410 and the diffusion plate 420.
[0019]
On the other hand, the image reading head 500 includes a visible light source unit 510, an ultraviolet light source unit 520, an infrared light source unit 530, and an image photographing unit 540. Specifically, the visible light source unit 510 is a light source for a full-color image, and as shown in FIG. 3, plays a role of cutting infrared light of the xenon lamp 511 and the xenon lamp 511 that affects the image quality at the time of capturing a full-color image. It comprises an infrared cut filter 512 and a UV cut filter 513 that plays a role of cutting the fluorescence emitted by the xenon lamp 511.
[0020]
The ultraviolet light source unit 520 is a fluorescent image light source, and as shown in FIG. 3, is a bandpass filter that is installed in front of the UV lamp 521 and the UV lamp 521 and transmits only ultraviolet light in a predetermined wavelength range. And a UV transmission filter 522.
[0021]
The infrared light source unit 530 is a light source for infrared images, and plays a role of cutting the fluorescence from the LED array 531 composed of three types of infrared LEDs and the UV lamp 521 as shown in FIG. And a UV cut filter 532.
[0022]
On the other hand, the image capturing unit 540 includes a CCD camera 541 for capturing an image, an imaging lens 542, and an imaging lens 542 in order to prevent the reflected ultraviolet light from the UV lamp 521 from entering the CCD camera 541. It is comprised from the UV cut filter 543 installed in front. As the CCD camera 541, a CCD camera 541 having a predetermined number of CCD elements (CCD pixels) and RGB three-color filters as required, and all CCD elements arranged one-dimensionally is used.
[0023]
FIG. 4 is a schematic diagram for explaining the fluorescence reference body. 4A is a schematic view seen from the top surface of the second structure portion 22 of the image capturing device 20, and FIG. 4B is a schematic cross-sectional view seen from the side surface of the second structure portion 22 of the image capturing device 20. It is. The fluorescence reference body is provided in the second structure portion 22 of the image capturing device 20. The fluorescent reference body referred to here emits predetermined fluorescence, and is, for example, an elongated reflector that emits predetermined fluorescence.
[0024]
As shown in FIG. 4A, the first fluorescent reference body 810 and the second fluorescent reference body 820 which are fluorescent reference bodies are L-shaped and are within the reading range of the CCD camera 541 (that is, the glass plate 700). It is arranged around. Also, as shown in FIG. 4B, the CCD camera 541 scans along the direction indicated by the arrow in the figure. Further, as shown in FIG. 3, the CCD camera 541 is integrated with the visible light source unit 510, the ultraviolet light source unit 520, and the infrared light source unit 530, and is attached as the image reading head 500. In practice, the image reading head 500 scans to take an image. For convenience of explanation, the expression that the CCD camera 541 scans is used.
[0025]
The first fluorescence reference body 810 is used for creating a fluorescence color temperature correlation function and the fluorescence image correction process, while the second fluorescence reference body 820 is used for monitoring the light amount.
[0026]
FIG. 5 is a schematic diagram for explaining fluorescent color temperature correlation function calculation and fluorescent image correction processing. As shown in FIG. 5, a line-shaped CCD camera 541 in which all CCD elements are arranged in a line has a total of (3n + m) CCD elements, and as shown in the drawing, m ( In this example, 20 CCD elements are used as light intensity monitoring pixels for monitoring the light intensity of the UV lamp 521, and the remaining 3n CCD elements (that is, R).₁~ R_n, G₁~ G_n, B₁~ B_n) Is used as an effective pixel, and is in the order of R pixel, G pixel, and B pixel. The effective pixel here means a pixel for taking an image in the reading range shown in FIG.
[0027]
In FIG. 5, R₁₁Is R₁The output value of the first line of pixels is set to R_n1Is R_nThe output value of the first line of pixels is set to R_1nIs R₁The output value of the nth line of the pixel is expressed as R_nnIs R_nIt means the output value of the nth line of the pixel. The meanings of the subscripts for the G pixel and the B pixel are the same as the subscripts for the R pixel.
[0028]
FIG. 6 is a flowchart for calculating the fluorescent color temperature correlation function. FIG. 7 is a flowchart of the fluorescence image correction process.
[0029]
The procedure for calculating the fluorescent color temperature correlation function will be described with reference to FIGS.
[0030]
In the present invention, the correlation between fluorescent color and temperature is defined as a fluorescent color temperature correlation function. That is, the fluorescent color temperature correlation function referred to in the present invention is a function that represents the relationship between the temperature of the R component, G component, and B component of the fluorescence emitted by the fluorescence reference material for each temperature. The fluorescence color temperature correlation function is calculated using a standard apparatus (fluorescence standard). In the present embodiment, the fluorescence color temperature correlation function is a CCD camera when the UV light 521 irradiates the first fluorescent reference body 810 with ultraviolet light at each temperature of 5 ° C. in the temperature range of 0 ° C. to 50 ° C. It is calculated from the output values of 541 specific pixels (reference pixels) (in short, the outputs of the R component, G component, and B component of the fluorescence emitted when the first fluorescence reference body 810 is irradiated with ultraviolet light). . A total of three reference pixels are allocated for each of the R component, the G component, and the B component. As the reference pixel, any effective pixel of the CCD camera 541 may be used, but in this example, the pixel R shown in FIG.₁, G₁, B₁Are an R reference pixel, a G reference pixel, and a B reference pixel, respectively.
[0031]
As a specific procedure, first, the temperature T is read from the temperature sensor 350 shown in FIG. 3 and stored (step S101). Next, any one of the three reference pixels (for example, the R reference pixel pixel R in the state where the UV lamp 521 shown in FIG. 3 is turned off).₁) Is stored (step S102). In short, step S102 measures AS which is an offset output.
[0032]
Next, the UV lamp 521 is turned on to irradiate the first reference phosphor 810 with ultraviolet light, and the output values ER (T), EG (T), and EB (T) of the reference pixels of the respective RGB wavelengths at this time are obtained. Read and store (step S103). The output value of the pixel here is a value obtained by A / D conversion. The wavelengths of R, G, and B are not particularly limited, but in this example, R is 630 nm, G is 560 nm, and B is 460 nm.
[0033]
The output of the light intensity monitor pixel of the UV lamp 521 is read, and the light intensity monitor output average value M (T) is calculated and stored (step S104). As described above, in this example, the 20 pixels at the end of the CCD camera 541 are used as light intensity monitoring pixels. The light amount monitor output here is an output value of the light amount monitor pixel for the reflected light when the second fluorescent reference body 820 shown in FIG. 4 is irradiated with ultraviolet light from the UV lamp 521.
[0034]
The procedure from step S101 to step S104 described above is performed at each temperature.
[0035]
Next, finally, the numerical values obtained in steps S102 to S104 at each temperature are converted into the fluorescence reference material for each temperature using the following formulas (1), (2), and (3). It is calculated as a standard output value of RGB when irradiated with ultraviolet light (step S105).
[0036]
Here, the standard output value of the fluorescence R emitted when the reference phosphor is irradiated with ultraviolet light at the temperature T is SR (T), the standard output value of the fluorescence G is SG (T), The standard output value of B of the fluorescence is SB (T). Further, the output value of any one of the reference pixels (for example, the R reference pixel) in a state where the UV lamp is turned off is defined as AS. The average output value of the light intensity monitor at 20 ° C. is M (20), and the average output value of the light intensity monitor at T ° C. is M (T).
[0037]
SR (T) = (ER (T) −AS) × M (20) / M (T) (1)
SG (T) = (EG (T) −AS) × M (20) / M (T) (2)
SB (T) = (EB (T) −AS) × M (20) / M (T) (3)
The above equations (1), (2) and (3) are referred to as standard output arithmetic expressions.
[0038]
In step S105 described above, a fluorescent color temperature correlation function is obtained from the RGB standard output values obtained at the respective temperatures using the standard output arithmetic expression and stored (step S106). Further, when the fluorescent color temperature correlation function is represented by a graph, the horizontal axis represents temperature, and the vertical axis represents SR (T), SG (T), and SB (T), respectively. In addition, as a specific method of obtaining the fluorescent color temperature correlation function, for example, it may be obtained by polynomial approximation, but is not limited thereto, and it is needless to say that it can be obtained by other methods.
[0039]
The calculation procedure of the fluorescence color temperature correlation function has been described above. Next, the procedure of the fluorescence image correction process when using an actual counterfeit discrimination device will be described with reference to FIGS. 5 and 7.
[0040]
First, the UV lamp 521 is turned off, and the output value AR of all effective pixels of the CCD camera 541 at that time.₁~ AR_n, AG₁~ AG_n, AB₁~ AB_nIs read and stored (step S201). In step S201, the offset output is measured and only one line of data of all effective pixels is measured. Note that all effective pixels here are all pixels R used for image data display as shown in FIG.₁~ R_n, G₁~ G_n, B₁~ B_nMeans.
[0041]
Next, the UV lamp 521 is turned on, and the output value RR of all effective pixels when the fluorescent reference material is irradiated with ultraviolet light.₁~ RR_nGG₁~ GG_n, BB₁~ BB_nIs read and stored (step S202). The temperature T is read and stored by the temperature sensor (step S203). The output values of m (20 in this example) pixels as the light quantity monitor pixels are read, and the average value is calculated and stored as the light quantity monitor output average value MM (step S204). Then, from the fluorescence color temperature correlation function, the standard output value SR (T) of the R component of the fluorescence emitted when the reference phosphor is irradiated with ultraviolet light at the temperature T read in step S203, the standard of the G component The output value SG (T) and the B component standard output value SB (T) are calculated and stored (step S205).
[0042]
Next, the image reading head 500 is scanned along the scanning direction indicated by the arrow in FIG. 5 (step S206). At that time, the output values CR, CG, and CB of all effective pixels are read, and the output values of the light quantity monitoring pixels are read (step S207).
[0043]
Here, for example, when the line scanned by the image reading head 500 is the first line, the output values CR, CG, CB of all effective pixels are specifically expressed as CR₁₁~ CR_n1, CG₁₁~ CG_n1, CB₁₁~ CB_n1become. In addition, when the line scanned by the image reading head 500 is the sixth line, the output values CR, CG, and CB of all effective pixels are specifically expressed as CR₁₆~ CR_n6, CG₁₆~ CG_n6, CB₁₆~ CB_n6become. When the line scanned by the image reading head 500 is the n-th line, the output values CR, CG, CB of all effective pixels are specifically expressed as CR_1n~ CR_nn, CG_1n~ CG_nn, CB_1n~ CB_nnbecome.
[0044]
Next, an average value of the output values of the read light quantity monitor pixels is calculated, and is set as the light quantity monitor output average value MV (step S208). Here, for example, when the line scanned by the image reading head 500 is the first line, the light amount monitor output average value MV is specifically expressed as MV₁become. Further, when the line scanned by the image reading head 500 is the n-th line, the light amount monitor output average value MV is specifically expressed as MV_nbecome.
[0045]
Then, using the following equations (4), (5), and (6), the output correction values DR, DG, and DB of the output values CR, CG, and CB of all effective pixels are calculated and stored (step S209). ).
[0046]
DR = (CR−AR) × SR (T) / (RR−AR) × MM / MV (4)
DG = (CG-AG) × SG (T) / (GG-AG) × MM / MV (5)
DB = (CB−AB) × SB (T) / (BB−AB) × MM / MV (6)
The above equations (4), (5) and (6) are referred to as fluorescence image correction equations.
[0047]
Specifically, for example, when the line scanned by the image reading head 500 is the first line, the output values of all effective pixels are CR₁₁~ CR_n1, CG₁₁~ CG_n1, CB₁₁~ CB_n1And their output correction values are DR₁₁~ DR_n1, DG₁₁~ DG_n1, DB₁₁~ DB_n1It becomes. At that time, the fluorescence image correction formula for obtaining the output correction value is as follows.
[0048]
DR₁₁= (CR₁₁-AR₁) X SR (T) / (RR₁-AR₁) X MM / MV₁
DG₁₁= (CG₁₁-AG₁) X SG (T) / (GG₁-AG₁) X MM / MV₁
DB₁₁= (CB₁₁-AB₁) X SB (T) / (BB₁-AB₁) X MM / MV₁
DR_n1= (CR_n1-AR_n) X SR (T) / (RR_n-AR_n) X MM / MV₁
DG_n1= (CG_n1-AG_n) X SG (T) / (GG_n-AG_n) X MM / MV₁
DB_n1= (CB_n1-AB_n) X SB (T) / (BB_n-AB_n) X MM / MV₁
For example, when the line scanned by the image reading head 500 is the nth line, the output values of all effective pixels are CR_1n~ CR_nn, CG_1n~ CG_nn, CB_1n~ CB_nnAnd their output correction values are DR_1n~ DR_nn, DG_1n~ DG_nn, DB_1n~ DB_nnIt becomes. At that time, the fluorescence image correction formula for obtaining the output correction value is as follows.
[0049]
DR_1n= (CR_1n-AR₁) X SR (T) / (RR₁-AR₁) X MM / MV_n
DG_1n= (CG_1n-AG₁) X SG (T) / (GG₁-AG₁) X MM / MV_n
DB_1n= (CB_1n-AB₁) X SB (T) / (BB₁-AB₁) X MM / MV_n
DR_nn= (CR_nn-AR_n) X SR (T) / (RR_n-AR_n) X MM / MV_n
DG_nn= (CG_nn-AG_n) X SG (T) / (GG_n-AG_n) X MM / MV_n
DB_nn= (CB_nn-AB_n) X SB (T) / (BB_n-AB_n) X MM / MV_n
In step S209, when the processing of the line is completed, it is determined whether the line scanned by the image reading head 500 is the final line (step S210). If it is not the final line, the process returns to step S206 to continue scanning of the image reading head 500, and then steps S207 to S209 are executed. If the scanned line is the final line, the image reading head 500 is stopped and returned to the home position (step S211). Actually, the processing from step 207 to step 209 is performed while the image reading head 500 is scanning.
[0050]
The fluorescent image correction processing procedure has been described above. By such correction processing, even if the use environment temperature of the counterfeit discrimination device of the present invention changes, an accurate fluorescent image can be obtained in any case without being affected by the change in the use environment temperature. In addition, the obtained image is always corrected for color balance, which has been unavoidable in the past.
[0051]
That is, as a feature of the counterfeit discrimination device and method according to the present invention, the change in the fluorescence image of the paper sheet that is the object to be differentiated according to the temperature is obtained using a fluorescence color temperature correlation function that is a correlation function between the fluorescence color and the temperature. Correction is to obtain a fluorescent image with very high reliability and good reproducibility, and authenticating paper sheets using this corrected fluorescent image. By doing in this way, it becomes possible to perform authenticity discrimination with much higher accuracy than before.
[0052]
In the embodiment described above, the appearance configuration of the counterfeit discrimination device according to the present invention has been described by taking the combination of a personal computer and a scanner-type image capturing device as shown in FIG. 1 as an example. However, the present invention is not limited to this, and any other external configuration may be adopted as long as it has a function as shown in the block diagram of FIG.
[0053]
【The invention's effect】
As described above, according to the counterfeit discrimination apparatus and method according to the present invention, it is very reliable by correcting the change in the fluorescence image of the paper sheet, which is the object to be discriminated by temperature, using the fluorescence color temperature correlation function. Since the fluorescence image has high reproducibility and good reproducibility, and authenticates the paper sheet using the corrected fluorescence image, it is possible to perform authenticity discrimination with higher accuracy than before.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of an external configuration of a forged discrimination device according to the present invention.
FIG. 2 is a block diagram showing an example of an internal configuration of a counterfeit discrimination device according to the present invention.
FIG. 3 is a schematic diagram for explaining an optical system of a counterfeit discrimination device according to the present invention.
FIG. 4 is a schematic diagram for explaining a fluorescent reference body.
FIG. 5 is a schematic diagram for explaining fluorescence color temperature correlation function calculation and fluorescence image correction processing.
FIG. 6 is a flowchart for calculating a fluorescent color temperature correlation function.
FIG. 7 is a flowchart of fluorescence image correction processing.
[Explanation of symbols]
1 Counterfeit discrimination device
10 Control personal computer (control PC)
11 Display
12 Keyboard
20 Image acquisition device
21 First structure part
22 Second structure part
23 Identification object placement section
100 PC side CPU
110 Fluorescent color temperature correction means
111 Fluorescence color temperature correlation function
112 Fluorescence image correction program
120 memory
130 Communication I / F
200 Device control CPU
210 Image processing block
220 CCD camera control block
230 CCD camera
240 motor
300 CPU for light source control
310 Light source control block
320 UV lamp
330 Xenon lamp
340 LED array
350 Temperature sensor
400 Transmitted light source head
410 Xenon lamp
420 Diffuser
430 Infrared cut filter
440 UV cut filter
500 Image reading head
510 Visible light source
511 Xenon lamp
512 Infrared cut filter
513 UV cut filter
520 Ultraviolet light source
521 UV lamp
522 UV transmission filter
530 Infrared light source
531 LED array
532 UV cut filter
540 Image shooting unit
541 CCD camera
542 Imaging lens
600 Paper sheets
700 glass plate
710 glass plate
810 First fluorescence reference material
820 Second fluorescence reference material

Claims (4)

In the counterfeit discrimination device that discriminates the authenticity of the discrimination object,
An ultraviolet light source that irradiates the discrimination object with light in the ultraviolet region;
Image photographing means for photographing an image;
Temperature measuring means for measuring the environmental temperature of the identification object;
Storage means for storing a fluorescence color temperature correlation function that is a correlation function between the color information of the fluorescence emitted by a reference phosphor that receives light in the ultraviolet region and emits fluorescence in a predetermined color, and temperature;
The ambient temperature measured by the temperature measuring means and the storage means when the ultraviolet light source irradiates the ultraviolet light in the ultraviolet region and takes a fluorescent image of the differential object by the image photographing means. A fluorescence image correcting means for correcting the fluorescence image of the object to be identified based on the stored fluorescence color temperature correlation function;
A counterfeit discrimination device comprising: The counterfeit discrimination device according to claim 1, further comprising image display means for displaying the fluorescent image corrected by the fluorescent image correction means. An infrared light source and a visible light source are further provided, and an infrared image and a full color image of the object to be identified are photographed by the image photographing means, and the fluorescent image corrected by the fluorescent image correcting means and the infrared image taken The counterfeit discrimination device according to claim 1 or 2, wherein an authenticity of the discrimination target is discriminated from an image and the captured full-color image. It is used in a counterfeit discrimination device comprising an ultraviolet light source that irradiates light in the ultraviolet region to an object to be differentiated and an image photographing means for photographing an image, and is a forgery discrimination method for distinguishing the authenticity of the object to be identified,
A storage step of calculating and storing a fluorescence color temperature correlation function that is a correlation function between the color information of the fluorescence emitted by the reference phosphor that receives light in the ultraviolet region and emits fluorescence in a predetermined color and the temperature;
A temperature measuring step for measuring the environmental temperature of the identification object;
The ambient temperature measured in the temperature measurement step and the storage step when the ultraviolet light source irradiates light in the ultraviolet region to the identification object and the image photographing means captures a fluorescent image of the identification object. A fluorescence image correction step of correcting the fluorescence image of the discrimination target based on the fluorescence color temperature correlation function stored in
A forgery discrimination method characterized by comprising:

Images