JPH06333123A - Discrimination device for printed matter - Google Patents

Abstract

PURPOSE:To provide the discrimination device for a printed matter by which a printed matter is discriminated by the color with simple and inexpensive configuration and the processing time is reduced and the discrimination performance is improved. CONSTITUTION:A light from a light source 1a is emitted onto a paper money P and its reflected light is subject to photoelectric conversion by a sensor 2a and its output is given to a differential arithmetic operation unit 5 via an amplifier 3a and an A/D converter 4a. A light from a light source 1b emitting a single color light with a different wavelength from that of the light source 1a is similarly emitted onto the paper money P, its reflected light is subject to photoelectric conversion by a sensor 2b and its output is given to the differential arithmetic operation unit 5 via an amplifier 3b and an A/D converter 4b. The difference arithmetic operation device 5 calculates a difference between an output of the sensor 2a and an output of the sensor 2b and stores the result to a memory 7. An arithmetic operation section 8 makes matching arithmetic operation processing between the result of difference operation in the memory 7 and a standard pattern in a memory 9 and gives the result to a CPU 10. The CPU 10 discriminates a type of money and forgery of the paper money P based on the result of arithmetic operation of the arithmetic operation section 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter discriminating apparatus which discriminates a denomination and authenticity of a bill in a bill processing machine by using a pattern matching method by color calculation.

[0002]

2. Description of the Related Art Conventionally, in this kind of printed matter discriminating apparatus, discrimination is performed by pattern matching of monochrome output components by monochromatic light or white light, or color separation of the pattern is performed, and each color component is patterned. The determination is made by performing matching.

[0003]

However, in the case of performing pattern matching of monochrome output components by monochromatic light or white light, for example, it is not possible to discriminate between fake bills and genuine bills by monochrome copying. Further, in the case of performing color separation and performing pattern matching for each color component, since complicated processing is required, there is a problem that the circuit becomes complicated and the entire apparatus becomes expensive, and the processing takes time. It was

It is therefore an object of the present invention to provide a printed matter discriminating apparatus capable of discriminating printed matter by color with a simple and inexpensive structure, and further shortening the processing time and improving the discrimination performance.

[0005]

SUMMARY OF THE INVENTION A printed matter discriminating apparatus of the present invention is an optical means for irradiating a printed pattern surface of a printed matter with light to obtain at least two kinds of reflected light having different wavelengths, respectively, and this optical means. Photoelectric conversion means for converting each of the two types of reflected light obtained in step 1 into an electric signal, calculation means for calculating the difference between the two photoelectric conversion signals obtained from this photoelectric conversion means, and the calculation result of this calculation means is preset. It is provided with a discriminating means for discriminating the kind of the printed matter by collating with the standard pattern.

In addition, the printed matter discriminating apparatus of the present invention irradiates the printed pattern surface of the printed matter with light to obtain at least two types of reflected light having different wavelengths, respectively, and an optical means 2 provided by this optical means. A photoelectric conversion unit that converts each kind of reflected light into an electric signal and a difference between two photoelectric conversion signals obtained from the photoelectric conversion unit are calculated, and a predetermined bias value is added to the difference to obtain a positive calculation result. It is provided with a calculating means for making a value, and a judging means for judging the kind of the printed matter or the like by collating the calculation result of the calculating means with a preset standard pattern.

Further, the printed matter discriminating apparatus of the present invention includes an optical means for irradiating the printed pattern surface of the printed matter with light to obtain at least two kinds of reflected light having different wavelengths, respectively.
The calculation result is positive by calculating the absolute value of the difference between the two photoelectric conversion signals obtained from this photoelectric conversion means and the photoelectric conversion means obtained from this photoelectric conversion means. It is provided with a calculating means for making a value, and a judging means for judging the kind of the printed matter or the like by collating the calculation result of the calculating means with a preset standard pattern.

[0008]

For example, the reflected light from the printed matter is separated into two colors, and the pattern matching is performed by the output difference between the two colors.
Compared to conventional pattern matching using a single color (monochrome) or pattern matching for each color-separated signal by distinguishing the printed matter, the distinction based on the color of the printed matter is simpler and cheaper. Can be done. Further, since pattern matching is not performed for each color-separated signal as in the conventional case, the processing time can be shortened and the discrimination performance can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a printed matter discriminating apparatus in a banknote handling machine according to the present embodiment. That is, the banknote P as the printed matter is conveyed in the direction of the arrow in the figure by the conveying means (not shown). The light source 1a is, for example, a light source that emits monochromatic light such as a light emitting diode, and irradiates the printed pattern surface of the conveyed banknote P with light. The reflected light from the surface of the banknote P is guided to a sensor (for example, a line sensor) 2a as a photoelectric conversion unit and converted into an electric signal according to the amount of reflected light. The converted electric signal is amplified by the amplifier 3a, converted into a digital signal by the A / D converter 4a, and input to the difference calculator 5.

On the other hand, the light source 1b is a light source that emits monochromatic light similar to the light source 1a, but emits monochromatic light having a wavelength different from that of the light source 1a. The light from the light source 1b is applied to the printing pattern surface of the banknote P which is also conveyed, and the reflected light is guided to the sensor (for example, a line sensor) 2b and converted into an electric signal according to the amount of reflected light.

In this case, the reflected light received by the sensor 2a and the reflected light received by the sensor 2b are lights reflected at different portions in the conveyance direction of the bill P. In FIG. 1, the sensor 2a
The reflected light received in 1 is the light reflected in the transport direction behind the reflected light received by the sensor 2b.

The electrical signal converted by the sensor 2b is amplified by the amplifier 3b and then amplified by the A / D converter 4.
It is converted into a digital signal at b. The output of the A / D converter 4b is delayed by the delay circuit 6 until the sensor 2a receives the reflected light at the same point on the banknote P, and then is input to the difference calculator 5. By delaying the signal received by the sensor 2b by the delay circuit 6, the light received by the sensor 2a and the light received by the sensor 2b are input to the difference calculator 5 at the same point on the banknote P. It becomes the signal of the reflected light.

The difference calculator 5 converts the two signals into one signal by calculating the difference between the reflected light signal received by the sensor 2a and the reflected light signal received by the sensor 2b. . The calculation result of the difference calculator 5 is temporarily stored in the memory 7.

In this way, when the memory 7 has finished storing the pattern data for one bill, the arithmetic unit 8 performs matching arithmetic processing with the standard pattern stored in the memory 9, and the result is stored in the CPU ( Output to the central processing unit) 10. A standard pattern of banknotes collected in advance is set and stored in the memory 9.

In the CPU 10, the denomination of the bill P, the conveying direction, and
Authenticity is discriminated and the discrimination result is output. By the way, as shown in FIG. 2A, when the output of the reflected light received by the sensor 2a is the sensor output S1 and the output of the reflected light received by the sensor 2b is the sensor output S2, the difference calculator 5 simply When the difference calculation of (S1−S2) is performed, FIG.
As shown in (b), the calculation result may be a negative value.

In general, the reflected light of the light does not have a negative value, and the pattern matching based on the reflected light amount of the light is basically handled with a positive value. Therefore, in the difference calculator 5, not a simple difference calculation, but as shown in FIG.
By adding a predetermined bias value B to the difference, the calculation result is always a positive value. As a result, the output of the difference calculator 5 is always a positive value, and the calculator 8 that performs the matching calculation process needs to handle only positive numbers as input data.

As described above, the reflected light from the bill is separated into two colors, the pattern matching process is performed by the difference between the output signals of the two colors, and the denomination and authenticity of the bill are discriminated. As described above, it is possible to discriminate by the color of the bill with a simple and inexpensive configuration, as compared with the case where pattern matching is performed in a single color (monochrome) or pattern matching is performed on each color-separated signal.
Further, since pattern matching is not performed for each color-separated signal as in the conventional case, processing time can be shortened and denomination discrimination performance and authenticity discrimination performance can be improved.

In the above embodiment, the difference calculator 5 adds a bias value to the difference to make the calculation result a positive value. However, the present invention is not limited to this, and as shown in FIG. It is also possible to make the operation result a positive value by taking the absolute value of.

Further, in the above-described embodiment, the case where the present invention is applied to the discriminating device for discriminating the denomination and authenticity of the bill has been described, but the present invention is not limited to this and the securities other than the bill are not limited thereto. The same can be applied to a discriminating apparatus that discriminates other types of printed matter.

[0020]

As described above in detail, according to the present invention, there is provided a printed matter discriminating apparatus which can discriminate a printed matter by its color with a simple and inexpensive structure and can shorten the processing time and improve the discrimination performance. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a printed material discrimination apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing an output of a sensor and a processing result of difference calculation for the output.

[Explanation of symbols]

P ... Banknote (printed matter) 1a, 1b ... Light source, 2a, 2
b ... Sensor (photoelectric conversion means) 4a, 4b ... A / D
Converter, 5 ... Difference calculator, 6 ... Delay circuit, 7, 9 ...
Memory, 8 ... Calculation unit, 10 ... CPU.

Claims (3)

[Claims] 1. Optical means for irradiating a printed pattern surface of a printed matter with light to obtain at least two kinds of reflected light having different wavelengths, respectively, and two kinds of reflected light obtained by the optical means are converted into electric signals. Photoelectric conversion means for conversion, operation means for calculating the difference between two photoelectric conversion signals obtained from this photoelectric conversion means, and the kind of the printed matter by collating the operation result of this operation means with a preset standard pattern A discriminating device for a printed matter, comprising: a discriminating unit for discriminating the above. 2. Optical means for irradiating a printed pattern surface of a printed matter with light to obtain at least two kinds of reflected light having different wavelengths, and two kinds of reflected light obtained by the optical means to electric signals. Photoelectric conversion means for converting, a calculation means for calculating a difference between two photoelectric conversion signals obtained from the photoelectric conversion means, and adding a predetermined bias value to the difference to make the calculation result a positive value; A discriminating device for a printed matter, comprising: a discriminating means for discriminating the kind of the printed matter by collating the calculation result of the means with a preset standard pattern. 3. Optical means for irradiating a printed pattern surface of a printed matter with light to obtain at least two kinds of reflected light having different wavelengths, and two kinds of reflected light obtained by the optical means to electric signals. A photoelectric conversion means for converting, a calculation means for calculating a positive result by calculating an absolute value of a difference between two photoelectric conversion signals obtained from the photoelectric conversion means, and a calculation result of the calculation means is set in advance. A discriminating device for a printed matter, comprising: a discriminating means for discriminating the kind of the printed matter or the like by collating the standard pattern.