JPH01223589A - Paper money recognizing device and paper money stain discriminating device - Google Patents

Abstract

PURPOSE:To improve a recognizing speed and to rapidly and surely select the stained paper money only out of a large quantity of the paper money by using the forming position and the shape of the transparent area of paper money at least as a part of paper money recognizing information. CONSTITUTION:A linear luminous body 1 such as a fluorescent pipe, etc., is inserted into a paper money recognizing device and a uniform linear light is radiated from a conveyance mechanism to paper money M. The transmitted light of the paper money M is made incident through a converging lens 2 on a contact type image sensor 3. For the sensor 3, a main scanning is executed in an arrangement direction and a sub-scanning along the conveyance direction of the paper money M in a perpendicular direction are executed. Consequently, the two-dimensional pattern of the transmissivity of the paper money M is read to a detecting circuit 4. A CPU 5 collates the money type discriminating result received from the detecting circuit 4, the pattern detecting result by a pattern detecting part 8 and the registering data of a dictionary data memory 6 and recognizes the paper money.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a banknote recognition device and a banknote defacement determination device used in automatic vending machines, automatic cash transaction systems, and the like.

(Prior Art) A banknote recognition device built into a terminal device of a vending machine or an automatic cash transaction system has a configuration as shown in an optical reading section in Fig. 6 and a digital processing section in Fig. 7. ing. When the banknote M to be recognized is conveyed in the direction of the arrow y, the width and lateral deviation of the banknote M are detected in the shape/position detection circuit 24 based on the output signals of the shape/position detection sensors 21 and 22, and The pattern detection sensor group 23 outputs the shading of the print pattern as an electrical signal. The detection position of the printed pattern detected by the pattern detection sensor group 23 and the pattern detection circuit 25 is as follows.
It is defined by the amount of lateral deviation detected by the shape/position/shape circuit 24. The detected width, amount of lateral deviation, and print pattern of the banknote M are transferred to the CPU 26 via the bus 28.

The CPU 26 recognizes the banknote M by comparing the transferred pattern data with the pattern data of each banknote registered in the dictionary data memory 27.

(Problems to be Solved by the Invention) In order to improve the recognition accuracy and expand the recognition range such as banknote types, the conventional banknote recognition device described above requires not only hardware such as a detection circuit but also a program for recognition. There is a problem that not only is the device complicated and expensive, but also the recognition time is lengthened.

Furthermore, although there are cases where it is desired to automatically sort out soiled banknotes from a large amount of banknotes, there is also the problem that it is difficult to use conventional banknote recognition devices for purposes of determining whether banknotes are soiled.

(Means for Solving the Problems) The banknote recognition device of the present invention determines the formation position and shape of a watermark area formed on a banknote to be recognized from changes in light transmittance inside and outside the unprinted watermark area. It is provided with means for detecting the information and using it as at least a part of the banknote recognition information.

The bill defacement discriminating device of the present invention includes means for detecting the light transmittance in the unprinted watermark area formed on the bill to be discriminated, and using it as at least part of the defacement discrimination information of the bill.

(Function) In Bank of Japan notes issued after 1980, watermark areas are formed in different positions depending on the banknote type and in shapes that differ depending on the banknote type. That is, as shown in FIG. 3, a circular watermark area is formed in the center of the -10,000 yen hole (A), and a vertically rectangular watermark area is formed at the left end of the 5,000 yen bill (B). In the 1,000 yen bill, a vertically elliptical watermark area is formed in the center (C).

This watermark area is not printed and has a different amount of light transmission than other parts of the banknote. Therefore, if the position and shape of the watermark area are detected by a light transmission amount detection sensor by irradiating a banknote with light of a --like amount of light, this can be used as part of the information for determining the denomination or dirt.

Hereinafter, the present invention will be explained in more detail along with examples.

(Embodiment) As shown in the perspective view of FIG. 1, an optical reading portion of a banknote recognition device according to an embodiment of the present invention is arranged below a banknote M that is conveyed at a predetermined speed in the direction of arrow X. A light emitter 1,
A condenser lens 2 and a contact image sensor 3 are provided above the condenser lens.

As shown in the block diagram of FIG. 2, the digital processing portion of the banknote recognition device of this embodiment includes a detection circuit 4 that receives and receives image data from a contact type image sensor 3, and a C
PU5, dictionary data memory 6, and bus 7 connecting these
and a pattern detection unit 8 that reads the pattern on the banknote for type determination.

A linear light emitting body 1 made of a fluorescent tube or the like irradiates a --shaped linear light onto a banknote M that is inserted into the banknote recognition device and is transported by a transport mechanism (not shown). The transmitted light that has passed through the banknote M is converged by the condensing lens 2 and enters the contact image sensor 3 with a light amount according to the transmittance.

Here, main scanning is performed in the arrangement direction of the contact image sensors 2, and sub-scanning is performed by conveying the bill M in a direction perpendicular to this. Therefore, the detection circuit 4 reads the two-dimensional pattern of the light transmittance of the banknote M.

FIG. 4 shows the output waveform of the contact image sensor 3 in the main scanning direction.

In FIG. 4, (A) shows an output waveform before the banknote M being conveyed reaches the installation position of the contact type image sensor 3. In this state, the irradiated light from the light emitter 1 is not blocked at all by the banknotes M being transported, so the amount of light received by the image sensor 3 becomes a large value exceeding the slice level Va over the entire main scanning period T.

FIGS. 4(B) to 4(C) show output waveforms in the main scanning direction at the time when the conveyance of various banknotes to be recognized progresses and the central portion of the short side reaches directly below the contact image sensor 3.

(B) shows the output waveform in the main scanning direction at the center of the short side of the - million yen hole. 1. -corresponds to the width of the long side of the million-yen hole,
t2 corresponds to the width of the central circular watermark area. Also,
(C) shows the output waveform in the main scanning direction at the center of the short side of the 5,000 yen bill. t3 corresponds to the width of the long side of the 5,000 yen bill, and t
4 corresponds to the width of the leftmost watermark area. Furthermore, (D) shows the output waveform in the case of a thousand yen bill. t corresponds to the width of the long side, and t6 corresponds to the width of the central oval watermark area.

FIG. 5 shows output waveforms of the contact image sensor 3 in the sub-scanning direction at the central portions of the long sides of various banknotes to be recognized.

(A) shows the output waveform in the case of - ten thousand yen hole. t.

-corresponds to the width of the short side of the million-yen hole, and t8 corresponds to the width of the central circular watermark area. (B) shows the output waveform for a 5,000 yen bill. Since t9 corresponds to the width of the short side and is the output waveform of the central portion of the long side, no change in output occurs due to the presence of the watermark area. (C) shows an output waveform for a thousand yen bill, where tlo corresponds to the width of the short side and tl+ corresponds to the width of the watermark area.

Here, the detection signal tl""tl+ has the following relationship.

(i) t,>t3>t.

(ii) tz #tit>tb (iii) t7#tq#t+.

(iv) t, ,>t.

The detection circuit 4 determines the denomination from the position and shape of the watermark area based on the characteristics of each denomination as shown in FIGS. 4 and 5, and notifies the CPU 5 of this via the bus 7.

The CPU 5 compares the denomination discrimination result received from the detection circuit 4, the pattern detection result by the pattern detection section 8, and the registered data in the dictionary data memory 6 to recognize the banknote.

On the other hand, in determining whether banknotes are defaced, defacement within the watermark area is determined from the transmissivity itself within the watermark area or the amount of variation in the transmissivity within the watermark area in the main scanning direction or sub-scanning direction. This determination result is used as at least part of the defacement determination information for the entire banknote.

(Effects of the Invention) As explained in detail above, the present invention is configured to utilize the formation position and shape of the watermark area of the banknote as at least a part of the banknote recognition device, so that the banknote can be recognized only from the conventional pattern. This has the effect that the device is extremely inexpensive and the recognition speed is significantly improved compared to a configuration that does.

In addition, since the banknote defacement discriminating device of the present invention is configured to use the light transmittance of the watermark portion and its spatial variation rate as at least part of the banknote defacement determination information, only the defaced banknotes out of a large amount of banknotes can be detected. It becomes possible to sort quickly and reliably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an optical reading section of a banknote recognition device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a digital processing section of the banknote recognition device, and FIG. 4 and 5 are waveform diagrams showing the output waveforms of the image sensor during main scanning by the image sensor and sub-scanning due to the conveyance of banknotes. FIG. 7 is a plan view of an optical reading section of a conventional banknote recognition device and a block diagram showing the configuration of a digital processing section. 1... Linear light emitter, 2... Converging lens, 3...
Image sensor, 4... detection circuit, 5... CPU,
6... Dictionary data memory, 7... Bus, 8... Pattern detection section.

Claims (2)

[Claims] (1) A means for detecting the formation position and shape of the watermark area from changes in the light transmittance inside and outside the unprinted watermark area formed on the banknote to be recognized, and using this as at least part of the banknote recognition information. A banknote recognition device comprising: (2) Banknote defacement determination characterized by comprising means for detecting the light transmittance in a non-printed watermark area formed on the banknote to be determined and using it as at least part of the defacement determination information of the banknote. Device.