JPS59160284A - Discriminator for printed matter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a printed matter that determines the authenticity, type, and integrity of banknotes by detecting physical quantities such as printing conditions, patterns, and colors of banknotes. This invention relates to a discriminating device.

[Technical background of the invention]

Conventionally, there is one shown in FIG. 1 as this type of discrimination device. In the figure, P is a banknote, which is conveyed in the direction of the arrow in the figure by a conveyor belt (not shown). Reference numeral 1 denotes a light source for illumination, which illuminates the surface of the banknote P passing through the detection area 2. The reflected light from the banknote P due to this illumination is guided through the lens 3 to the photoelectric converter 4, where it is converted into an electric signal according to the brightness and darkness of the two sides of the banknote, and the electric signal is sent to the amplifier 5. . On the other hand, numerals 6 and 7 are light receiving elements for detecting banknotes P, and their outputs are sent to a timing generation circuit 8.

This timing generating circuit 8 generates sampling pulses at regular intervals while the banknote P passes through the detection area 2 based on the outputs of the light receiving elements 6 and 7. According to this sampling pulse, the output signal of the amplifier 5 is sampled at fixed time intervals by a sampling circuit 9, and converted into a digital signal by a φ converter 10. This line converter 1
The output of 0 is supplied to an arithmetic circuit 11, to which the contents of the memory 12 are also supplied. Sampling signals (standard values) of genuine and clean banknotes are stored in advance in the memory 12, and the contents of the memory are sequentially sent to the arithmetic circuit 11 by pulses from the timing generation circuit 8. The arithmetic circuit 11 performs a predetermined arithmetic operation to check the similarity between the genuine banknote signal from the memory 12, the signal from the banknote P to be discriminated, and the output of the banknote converter 10. The result is sent to the determination circuit 13. The determination circuit 13 determines authenticity, type, fitness, etc. based on the output of the arithmetic circuit 11.

[Problems with background technology]

However, the conventional discrimination device described above has the following problems. That is, since detection is performed over the entire surface of the banknote, the reliability of discrimination is higher than that of methods that detect at specific points.

On the other hand, however, since the entire banknote is detected, it is difficult to distinguish between authenticity and type by focusing on differences in printing conditions and patterns. , the variation increases due to this influence.

On the other hand, in determining whether the banknote is fit or defective by focusing on changes in unprinted areas such as watermarks or peripheral edges, the reliability of the determination results decreases due to the influence of variations in the density of printing ink in the printed areas. .

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a printed matter discrimination device that is not affected by dirt or variations in print density of printed matter to be discriminated and is highly reliable. It is in.

[Summary of the invention]

The printed matter discrimination device according to the present invention performs discrimination by weighting according to the area of the printed matter to be discriminated. In other words, for example, when determining authenticity or type, weight is placed on the printed part of the printed matter to reduce the influence of dirt, and when determining whether the printed matter is fit or defective, the printed matter is By placing weight on the non-printed portions of the image, it is possible to avoid being affected by variations in print density.

6- [Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted, and the different parts will be explained. In Figure 2, 141°14! is a mask value memory in which information about how much to reduce the amplitude of the input signal, and mask values t and b are stored. The above mask value must be multivalued, and the amplitude of the input signal is directly t (1/2 times).
V2 (1/2'), 1/4 (1/22 times)
to make it 1/8 (1/2)...
...to 1/128 (1/27 times), and 1/
256 (1/28 times), mask values iro, 1.2°3, . . . 7, 8 are set respectively. Then, the mask calculation units 151 and 152 operate 1. Read the output (sampling signal) and mask value of the width converter 10,
The amplitude of the sampling signal is changed according to the mask value. Since the timing generation circuit 8 outputs sampling pulses while the banknote P passes through the detection area 2, the mask operators 15t and 15□ sequentially perform mask operations on the sampling signals, and apply them to the arithmetic units. 1r162. Here, the state of the mask calculation is shown in Figure 3. (A
) The figure shows the output of the amplifier 5, which is an input signal proportional to the change in brightness in the detection area 2. (B) shows the output (sampling pulse) of the timing generation circuit 8, where a corresponds to the leading edge of the bill P and f corresponds to the trailing edge.

(C) Output (sampling signal) of the figure-fitting converter 10. The figure below shows the mask values in the mask value memory. It shows three stages. @) The figure shows the output of the mask calculator, and the result of applying the mask shown in the figure (C) to the signal shown in the figure is axb and e.
-f section remains the original amplitude, b-"c and d y
In the section e, the amplitude is 1/2, and in the section c''-d, the amplitude is 1/4.

By the way, the mask value memory 142 is for determining authenticity and type, and the mask value in this memory is r
In OJ (the amplitude of the jamb input signal remains the same), the mask value of the non-printed portion is large (the amplitude of the jamb input signal is decreased). As a result, the condition of the printed pattern of the banknote, which is important for determining the authenticity and type of banknote, can be obtained in an emphasized manner without being affected by dirt or the like. On the other hand, the mask value memory 141 is for determining whether the banknote is good or bad.
0”. As a result, it is possible to emphasize the soiled state of the watermark part and the peripheral part of the banknote, which are important for determining whether the banknote is fit or not, without being affected by variations in printing density. Further, the mask calculators 151, 15B each have a mask value memo +) 141, 14, . This is a shift register that halves the input signal by the number of mask values from .

Therefore, in the computing unit 161 r 162, the output signal of the mask computing unit 151 * 152 and the standard value memory 171 .
17. The difference between the signal and the standard signal stored in the signal is successively determined, and the cumulative sum thereof is determined. The standard value memory 172 is for determining authenticity and type.
Mask value memory 14 to the signal from the genuine banknote in advance
! The signal obtained by calculating the mask value of is stored.

Further, the standard value memory 171 is used for determining whether the bill is good or bad, and stores therein a signal obtained by calculating a mask value in the mask value memory 141 on a signal from a clean and genuine banknote. The cumulative sums thus obtained by the arithmetic unit 161r16z are sent to the comparison/judgment circuit 181r182. These comparison/judgment circuits 181 and 182 are comparators.)
, the cumulative sums sent from the arithmetic units 161 and 162 are compared to determine whether they are within a predetermined range, and the results are sent to the comprehensive determination circuit 19. That is, in the comparison and determination circuit 182,
If the cumulative sum of the differences between the signal of the banknote to be determined and the standard signal is within a certain value, the banknote is considered genuine, and if it exceeds a certain value, it is considered a counterfeit banknote or a different type of banknote.

In addition, in the comparison/judgment circuit 181, if the cumulative sum of the difference between the signal of the banknote to be discriminated and the standard signal is within a certain value, it is considered to be a clean bill, and if it exceeds the certain value, it is considered to be a dirty, damaged note. I reckon. These determination results are comprehensively determined by the comprehensive determination circuit 19, and the banknote P is determined.

In this way, by weighting the printed and non-printed parts of the banknote, the authenticity, type, and fitness of the banknote can be determined. That is, the authenticity and type of banknotes are determined by weighting the printed portions of the banknotes, and the integrity of the banknotes is determined by weighting the non-printed portions of the banknotes. As a result, accurate discrimination is always possible without being affected by dirt on banknotes or variations in printing density, and high reliability can be obtained.

In the above embodiment, the mask calculator 151°15! Although a shift register is used as a divider, it may also be used as a divider. In this case, the mask value in the mask value memory does not indicate the number of shifts, but rather the divisor. In this way, the amplitude of the input signal can be reduced to an arbitrary magnitude. In addition, arithmetic units 161.16. The cumulative sum of the difference from the standard signal was calculated in , but only the cumulative sum (integral value) of the signal after the mask operation was calculated, and on top of this and the cumulative sum (integral value) of the standard signal calculated in advance, Even when compared with the lower limit value, the effects of the present invention are not impaired.

Furthermore, in the above embodiment, the mask value is multi-valued, and true/false,
Two types of mask value memory are prepared: one for type discrimination and one for fitness/failure discrimination. However, if the mask value is binary, the mask value memory can be reduced to one as shown in Figure 4. is also possible. In FIG. 4, reference numeral 14 denotes a mask value memory, in which the mask value ``1'' is stored in the area corresponding to the printed portion of the banknote, and the mask value ``0'' is stored in the area corresponding to the non-printed portion of the banknote. 201 is a mask calculator for determining whether the mask value is "1", the amplitude of the input signal is zero, and the mask value is "0".
”, the input signal amplitude is left as it is,
It has the function of passing only the signal from the unprinted part of the banknote.

20R is a mask calculator for determining authenticity and type; when the mask value is "1", the amplitude of the input signal is left as is; when the mask value is "0", the amplitude of the input signal is made zero; It has the function of passing only the signals from the printed part of the banknote. Even in this case, the same effects as those of the embodiment described above can be obtained, and the circuit configuration can be simplified.

Furthermore, in the above embodiments, the case where the determination is made by detecting an optical physical quantity has been described, but the present invention can be similarly applied to the case where the determination is made by detecting the magnetic physical quantity of a banknote. In this case, the portion with magnetic printing becomes a printed portion, and the portion without magnetic printing becomes a non-printed portion.

Further, in the above embodiment, the case where the present invention is applied to the discrimination of banknotes has been described, but the present invention is not limited thereto, and can also be applied to the discrimination of printed matter other than banknotes, such as checks and securities.

〔Effect of the invention〕

As detailed above, according to the present invention, there is provided a printed matter discrimination device that is not affected by dirt or variations in print density of printed matter to be discriminated and is always capable of accurate discrimination, and is highly reliable. can.

13-

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional discrimination device, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a diagram showing the state of mask calculation in the same embodiment, and FIG. 4 is a block diagram showing an embodiment of the present invention. It is a block diagram showing other examples of. P...Banknote (printed matter to be distinguished), 1...Light source, 2...
Detection area, 4... photoelectric converter, 9... sampling circuit, 10... converter, 141, 141. 14...Mask value memory, 151 r152 m
201s202...mask calculator, 161 r'
6*...Arithmetic unit, 171.172...Standard value memory, 18 violets. 182... Comparison judgment circuit, 19... Comprehensive judgment circuit. Representative Patent Attorney Kensuke Chika (and 1 other person) 14-

Claims (9)

[Claims] (1) A detection means for detecting a physical quantity of a printed material to be discriminated and converting it into an electrical signal, a weighting means for weighting the output of the detection means according to an area of the printed material to be discriminated, and an output of the means for weighting. What is claimed is: 1. A printed matter discriminating device comprising: a determining means for determining the authenticity, type, fitness, etc. of a printed matter to be discriminated by comparing the printed matter with a standard value set in advance; (2) The printed matter discrimination device according to claim 1, wherein the detection means is a photoelectric converter that receives reflected light or transmitted light from the printed matter to be discriminated and converts it into an electrical signal. (3) The printed matter discriminating device according to claim 1, wherein the areas include a printed portion and a non-printed portion. (4) In the above-mentioned weighting method, the signals corresponding to the printed portions are weighted, the signals corresponding to the non-printed portions are not weighted, and the authenticity of the printed matter is determined by the determining means. 3. The printed matter discriminating apparatus according to claim 3, wherein the printed matter discriminating apparatus determines the type. (5) The weighting is performed by weighting means such that a signal corresponding to a non-printed part is weighted, a signal corresponding to a printed part is not weighted, and the determining means determines whether the printed material is fit or not. 4. The printed matter discriminating apparatus according to claim 3, wherein the printed matter discriminating apparatus performs a determination. (6) The weighting means includes a first means that weights a signal corresponding to a printed portion and does not weight a signal corresponding to a non-printed portion, and a first means that weights a signal corresponding to a non-printed portion. 4. The apparatus for discriminating printed matter according to claim 3, further comprising a second means for weighting the signal corresponding to the printed part and not weighting the signal corresponding to the printed part. (7) The first means and the second means store binary numerical values indicating whether or not to apply a weight in one memory, and the first means and the second means store a binary value indicating whether or not to apply a weight. 7. The printed matter discriminating device according to claim 6, wherein the printed matter discriminating device is reversed with respect to the second means. (8) The printed matter discriminating apparatus according to claim 1, wherein the weighting means stores in a memory a multivalued numerical value proportional to the degree of weighting. (9) The printed matter discriminating device according to claim 3, wherein the multivalued numerical value is 1/2n, and the value n is stored in a memory.