JPS59184993A - Discrimination level setting system for printed matter discriminator - 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 discrimination level setting method for a printed matter discriminating device that automatically sets a discrimination level in a printed matter discriminating device that performs, for example, determining the authenticity of banknotes.

[Technical background of the invention and its problems]

For example, a printed matter discrimination device that determines the authenticity of banknotes separates the reflected light or transmitted light from the banknote into colors and integrates each component over a part or the entire banknote.
A method is used to determine authenticity by comparing the integral value with a predetermined determination level. Conventionally, when using such a discriminating device to determine the level of authenticity, the discriminating device passes through a large number of genuine banknotes and collects data from each banknote, and then a human being performs an analysis based on the data. A discrimination level was determined and this discrimination level was input into the device.

However, with such a method, when the number of detection items increases, the amount of data collected becomes enormous, it takes a considerable amount of time to determine the discrimination level, and furthermore, the subjectivity of the person who decides the discrimination level is involved, and it may vary depending on the person. There was a problem in that the determined discrimination levels were different.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide a print discrimination device that can automatically set a highly reliable discrimination level in a short period of time by simply passing through printed matter that should become a standard. The objective is to provide a level setting method.

[Summary of the invention]

For example, when determining the authenticity of banknotes, as described above, the reflected light or transmitted light from the banknote is separated into colors, each component is integrated over a part or the entire banknote, and the authenticity is determined based on these integrated values. However, when these integral quantities are collected using a large number of banknotes, the first
As shown in Figure (a), the distribution is close to normal distribution, or as shown in Figure (b), it is close to binomial distribution. However, the tail of the distribution is quite different from that of a normal distribution or a binomial distribution, and as shown in Figure 2, the tail may be longer or shorter depending on the detection item. Therefore, if the discrimination level is determined by a mathematical formula using a statistical method based on the average value or standard deviation, the reliability of the set discrimination level may be poor even though it takes a long calculation time.

Therefore, in the present invention, based on the spread width of the range where data exists continuously among the data distribution obtained by collecting data for each detection item, the discrimination level is defined as a level obtained by widening the range by a certain width. This makes it possible to automatically set a highly reliable discrimination level.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows an example of the configuration of an apparatus for carrying out the present invention. That is, 1 is a data input unit for obtaining banknote data (color, etc.), and is constituted by a reading device for optically reading banknote data. Reference numeral 2 denotes a storage unit that stores data for each detection item of banknotes, in which all data of passed banknotes are stored in a frequency distribution manner. Reference numeral 3 denotes a width setting section, in which the amount of width to be widened when determining the discrimination level can be set using a switch or the like. 4 is a calculation unit, which calculates the average value from the collected data,
Calculations are performed to determine the upper limit value, lower limit value, etc., and the final discrimination level is determined.

Reference numeral 5 denotes a level setting section for setting the discrimination level determined by the calculation section 4, and the level written by the calculation section 4 becomes the discrimination level for each detection item. Reference numeral 6 denotes a control section that controls each of the above-mentioned sections.

In such a configuration, the discrimination level setting method of the present invention will be explained with reference to FIGS. 4 and 5. In addition, the fourth
The figure is a diagram explaining how to determine the upper and lower limits from the data distribution obtained by collecting data every day.The figure shows how to determine the upper and lower limits from the data distribution obtained by collecting data. frequency r
The figure shows how the OJ levels are set to upper and lower limits, respectively. Further, FIG. 5 is a flowchart for explaining the operation. First, by sequentially passing through a large number of genuine banknotes that should become a standard one by one, the data for each detection item of the passed-through banknotes is captured by the data processing unit 1 and stored in the storage unit 2 in a frequency distribution manner. is memorized.

That is, the storage unit 2 has storage areas for all levels, and is configured to count up the frequency of the corresponding level every time a banknote is passed through. When all the banknotes have passed through, the calculation unit 4 first calculates the average value from the data in the storage unit 4, and from that average value, calculates the initial frequency rOJ level on the upper limit side and the lower limit side,
The upper limit value U-LMT and the lower limit value L-LMT, respectively.
and find the difference. Next, the width @dXX (-/100) is obtained using the value) 11 set in the width setting section 3. Next, using the obtained widening width d, the upper limit side discrimination level LVL, -, U,
The lower limit side discrimination level LVL-L is calculated and written in the level setting section 5.

LVL-U=(U-LMT)-1-d LVL-L=(L-LMT)-d By repeating the above operation for each detection item, the automatic setting of the discrimination level is completed.

In addition, in the above embodiment, the difference between the upper limit value and the lower limit value is calculated, but the calculation may be performed by calculating the added value instead of the difference, or the upper limit value and the lower limit value themselves may be widened by a certain width. . Further, when determining the upper limit value and the lower limit value, the average value is used as a reference, but the minimum value and the maximum value may be used instead of the average value. Further, although the spread width is obtained based on the value set in the width setting section, the same effect is not limited to this, and the same effect can be obtained by using a predetermined value (level) or a predetermined amount (chi).

Further, in the above embodiments, the case where the application is applied to a discrimination device that discriminates the authenticity of banknotes has been described, but the application is not limited to this, for example,
Furthermore, it can be applied to a discrimination device that discriminates the authenticity of securities other than banknotes μ or printed matter such as checks.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a discrimination level setting method for a printed matter discriminating apparatus that can automatically set a highly reliable discrimination level in a short time by simply passing through printed matter that is to be a standard.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an example of data distribution obtained from banknotes, Figures 3 to 5 are for explaining an embodiment of the present invention, and Figure 3 is a diagram showing an example of data distribution obtained from banknotes. FIG. 4 is a block diagram showing an example of the configuration of an apparatus for determining the upper limit value and the lower limit value. FIG. 5 is a flow chart showing the operation. DESCRIPTION OF SYMBOLS 1... Data input part, 2... Storage part, 3... Width setting part, 4... Calculation part, 5... Level setting part. Representative patent attorney close aide Kensuke (and 1 other person) Figure 1 Bell level Figure 3 Figure 4 Figure 5

Claims (5)

[Claims] (1) In a printed material discrimination device that performs predetermined discrimination by reading the data of stamped objects and comparing it with a predetermined discrimination level, data is read from each of a large number of printed materials that are to be the standard, and the distribution of the read data is used to determine the Upper limit of average value. Among the levels of frequency "0" on both lower limit sides, the level closest to the average value is the upper limit value and lower limit value, respectively, and this upper limit value,
A discrimination level setting method for a printed matter discrimination device, characterized in that the discrimination level is determined based on a lower limit value. (2) Claim 1, characterized in that the determination level is a level obtained by widening the upper limit value and the lower limit value by a certain width, respectively.
Discrimination level setting method for the printed matter discriminator described in Section 1. (3) A difference between the upper limit value and the lower limit value is determined, and the difference is used to widen the upper limit value and the lower limit value by a certain width, respectively, and the level is set as the discrimination level. Discrimination level setting method for printed matter discrimination device. (4) The upper limit value and the lower limit value are added and the added value is used to widen the upper limit value and the lower limit value by a certain width, respectively, and the discrimination level is defined as the discrimination level. Discrimination level setting □ method of the printed matter discrimination device described. (5) A discrimination level setting method for a printed matter discrimination device according to any one of claims 2 to 4, wherein the amount of lowering by a certain width can be arbitrarily set by a switch or the like.