CN102176260A

CN102176260A - Method for detecting bank paper fluorescent ink and realizing device thereof

Info

Publication number: CN102176260A
Application number: CN201010622647XA
Authority: CN
Inventors: 易鲜红; 赵宝昌; 杨志坚
Original assignee: NANJING LGSPEED TECHNOLOGY Co Ltd
Current assignee: NANJING LGSPEED TECHNOLOGY Co Ltd
Priority date: 2010-12-30
Filing date: 2010-12-30
Publication date: 2011-09-07

Abstract

The invention provides a method for detecting bank paper fluorescent ink and a realizing device thereof. The method comprises the following steps: irradiating bank paper containing fluorescent ink with an ultraviolet light source; receiving reflective light on the surface of the bank paper by using a color sensor; inputting and processing red, green and blue signals in a processor; determining whether the bank paper has the fluorescent ink or not according to the preset characteristic value of the bank paper ink, and whether the fluorescent ink is in accordance with the fluorescent ink of real bank paper or not; and outputting a determining conclusion by the processor. The detecting device comprises the ultraviolet light source and the color sensor, wherein the transmitting port of the ultraviolet light source and the light inlet of the color sensor are positioned at the same side of the bank paper; and the color sensor is connected with a signal processing module. By the method and the device, determination on characteristics of the fluorescent ink can be accurately realized, the structure is simple, the processing speed is high, the processing flexibility is improved, and the assembly is convenient.

Description

A kind of method and implement device thereof that detects the bank note fluorescent ink

Technical field

The present invention relates to a kind of detection technique that detects the bank note fluorescent ink, particularly a kind of method and implement device thereof that detects the bank note fluorescent ink.

Background technology

Fluorescent ink is the printing ink made from fluorescent pigment, and its printed matter can show the visible light of various colors under UV-irradiation, because the forgery difficulty of this technology is bigger, and a large amount of these technology of using in the guiding against false of paper currency.Just all taked this technology in the 5th cover Renminbi, under the irradiation of ultraviolet source, offset printing shading place below the row name of front can manifest the rectangle fluorescence area of a yellow, can see in the zone and the corresponding arabic numeral of banknote denomination.

Application number is 201010033743.0 applications for a patent for invention, discloses a kind of method and can take the record phosphor pattern; The method uses imageing sensor to take and the record phosphor pattern, and imageing sensor must be equipped with high-speed CPU and handle, the system configuration height, and the process software complexity, the cost height, processing speed is slow, and is inapplicable in the detection of bank note fluorescent ink;

Sweet hamming: " chip microcontroller intelligence fluorescence false distinguishing " literary composition, " application of electronic technology " 2006 the 9th phases, proposed a kind of method of detection bank note fluorescent ink of pure hardware.This method has two shortcomings: 1) use the comparer of pure hardware to carry out the signal intercepting, consistance is poor, is unfavorable for producing in batches, and poor anti jamming capability in use has many restrictions; 2) do not introduce colored notion, detected intensity is low, only detects to have or not, and more senior a little pseudo-coinage just may can not detect.

Summary of the invention

The object of the present invention is to provide a kind of method and implement device thereof of simple in structure, cost is low, detection is effective, processing speed is fast detection bank note fluorescent ink.

The technical solution that realizes the object of the invention is:

A kind of detection method of bank note fluorescent ink is characterized in that may further comprise the steps:

1 usefulness ultraviolet source irradiation contains the bank note of fluorescent ink;

2 use the reflection ray of color sensor reception note surface,

3 RGB three road signals are input to processor and handle, and judge according to default bank note printing ink eigenwert whether bank note has fluorescent ink, and whether fluorescent ink are consistent with the fluorescent ink of genuine note;

4 processors are judging conclusion output.

A kind of device that detects the bank note fluorescent ink is characterized in that: it comprises ultraviolet source and color sensor, and the emission port of ultraviolet source and the light inlet of color sensor are positioned at the homonymy of bank note; Color sensor is connected with signal processing module.

The present invention compared with prior art, its remarkable advantage is: 1) simple in structure, processing speed is fast, does not need optical filter, does not need imageing sensor, does not need complex processing systems, cost reduces significantly; 2) can use software that color signal is handled, conveniently eliminate the inconsistent of hardware, antijamming capability is strong, helps producing in batches; 3) handle flexibility ratio and improve, the fluorescent ink of different colours only needs to revise algorithm, just can realize the judgement of fluorescent ink feature exactly; 4) reduced the size of parts, the convenient installation.

Description of drawings

Fig. 1 is a kind of structural representation of detection bank note fluorescent ink device of the present invention.

Fig. 2 is the pie graph of signal processing module of the present invention.

Fig. 3 is the structural representation of many groups of detection bank note fluorescent ink device state of the present invention.

Embodiment

Consult shown in Figure 1ly, the main process of the detection method of bank note fluorescence of the present invention is: 1 usefulness ultraviolet source irradiation contains the bank note of fluorescent ink; 2 use color sensor to receive the reflection ray of note surface; 3 RGB three road signals are input to processor and handle, and judge according to default bank note printing ink eigenwert whether bank note has fluorescent ink, and whether fluorescent ink are consistent with the fluorescent ink of genuine note; 4 processors are judging conclusion output.

Use the UVLED lamp of 365nm～385nm to do the fluorescence excitation light source, under certain angle, shine note surface, above the bank note fluorescent ink, receiving device is installed, receiving device is red, green, blue (RGB) color sensor, the fluorescent ink of note surface can send colored fluorescence under the irradiation of ultraviolet light, after color sensor spare receives colored light signal, converting the output of three road electric signal to, is respectively R, G, B; The luminous intensity of UVLED can be adjusted automatically by software;

Consult shown in Figure 2ly, the color sensor signal carries out hardware amplification, hardware filtering, A/D after color sensor output, enter CPU, and whole waveform is stored among the RAM of CPU.After obtaining the complete signal of entire paper coin, further every road signal is carried out digital filtering and shaping again, just can obtain complete signal waveform.Behind corresponding image algorithm, just can obtain specific fluorescent ink characteristic curve.

Algorithm summary: fluorescent ink is under UV-irradiation, and the light that sends is generally non-blue light, and common have yellow fluorescence, a green fluorescence.Collect R, G, B three road signals, calculated the colourity and the brightness of each collection point earlier, in brightness, had the part of fluorescent ink to have tangible high point; Point and genuine note feature that statistics satisfies bank note fluorescent ink color compare, and just can differentiate whether fluorescent ink is arranged, and whether this fluorescent ink is true.In order to reduce error, can take white balance, dark correction scheduling algorithm to improve degree of accuracy and environmental suitability.

In concrete enforcement, the bank note fluorescent ink is not generally on center line, because bank note advance the paper money direction exist 4 towards, so need ultraviolet source 1 and color sensor 2 be set at multiple spot, a ultraviolet source 1 and a color sensor 2 constitute one group, at least need four groups, be symmetricly set on the both sides of bank note.Each color sensor all is connected to follow-up signal processing module 3.

Claims

1. the detection method of a bank note fluorescent ink is characterized in that may further comprise the steps:

1.1 contain the bank note of fluorescent ink with ultraviolet source irradiation;

1.2 use color sensor to receive the reflection ray of note surface, convert light signal to red, green, blue three road electric signal;

Handle 1.3 RGB three road signals are input to processor, judge according to default bank note printing ink eigenwert whether bank note has fluorescent ink, and whether fluorescent ink is consistent with the fluorescent ink of genuine note;

1.4 processor is judging conclusion output.

2. detection method according to claim 1 is characterized in that after converting described light signal to RGB three road electric signal electric signal that is converted to by light signal being carried out Filtering Processing.

3. detection method according to claim 2 is characterized in that described filtering realizes by circuit filtering or software filtering.

4. device that detects the bank note fluorescent ink, it is characterized in that: it comprises ultraviolet source (1) and color sensor (2), and the emission port of ultraviolet source and the light inlet of color sensor are positioned at the homonymy of bank note; Color sensor is connected with signal processing module (3).

5. according to the device of the described detection bank note of claim 4 fluorescent ink, it is characterized in that: described signal processing module (3) is made up of signal amplification and filtering circuit, analog to digital conversion (A/D) circuit, central processing unit (CPU), output circuit, color sensor connects signal and amplifies and filtering circuit, signal amplifies and filtering circuit connects analog to digital conversion circuit, analog to digital conversion circuit connects central processing unit, and central processing unit connects output circuit.

6. according to the device of the described detection bank note of claim 5 fluorescent ink, it is characterized in that: connect the ultraviolet source transmitter module on the central processing unit of signal processing module (3).

7. according to claim 4 or 5 or 6 described bank note fluorescent ink pick-up units, it is characterized in that color sensor is the monochromatic color sensor of red, green, blue, or be integrated RGB polychrome color sensor.

8. according to claim 4 or 5 or 6 described bank note fluorescence detection devices, it is characterized in that being provided with between described ultraviolet source and bank note the ultraviolet filter that only allows ultraviolet light to pass through.

9. bank note fluorescence detection device according to claim 4 is characterized in that ultraviolet source (1) and color sensor (2) are configured to group, uses 2～6 groups simultaneously, is arranged on the one or both sides of bank note.