JPH10241000A - Special original discriminating apparatus, special original discriminating method, and machine-readable recording medium storing a program for causing a computer to execute the method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the accuracy of determination of a special document by enabling an electromagnetic wave used to determine whether the document is a special document to be distinguished from other electromagnetic waves. SOLUTION: A code generation unit 102 for generating an identification signal for specifying a source of an electromagnetic wave, a carrier generation unit 103 for generating a carrier, and a modulation signal generated by modulating a carrier using the identification signal. A modulating unit 104, a transmitting antenna 105 for irradiating the original 101 with electromagnetic waves based on the modulation signal, a receiving antenna 106 for detecting the electromagnetic waves irradiating the original 101 and outputting a detection signal, and demodulating by inputting the detection signal A demodulation unit 108 for decoding, a decoding unit 109 for decoding a signal obtained by demodulation, and a determination unit 110 that inputs a code obtained by decoding and determines whether or not the code matches the corresponding code. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special manuscript judging device for preventing forgery of special manuscripts such as banknotes and securities,
The present invention relates to a special original determination method and a machine-readable recording medium storing a program for causing a computer to execute the method, and more specifically, an electromagnetic wave used to determine whether a document is a special original can be distinguished from other electromagnetic waves. As described above, the present invention relates to a special original discriminating apparatus, a special original discriminating method, and a machine-readable recording medium on which a program for causing a computer to execute the method is provided.

[0002]

2. Description of the Related Art In recent years, with the improvement of image processing technology and image forming technology, it has become possible to form an image so precisely that a copy bill copied by a color copying machine and an actual bill cannot be easily distinguished. . For this reason, an apparatus has been developed which determines whether or not a special manuscript is prohibited from being copied, such as banknotes and securities, and prevents forgery in the case of a special manuscript. An image forming apparatus such as a copying machine equipped with a function has also been proposed.

As the above-mentioned special manuscript, there is a manuscript in which metal fibers are inserted to indicate that the manuscript is a special manuscript. In order to discriminate such a special document from a normal document, a metal fiber inserted into the special document may be detected. Therefore, as an image forming apparatus having a function of determining a special document into which a metal fiber has been inserted, a microwave is applied to the document, and a transmitted wave or a reflected wave of the irradiated microwave is detected and a reflected wave is detected. A microwave sensor that outputs a detection signal of the above, and a signal determination unit that receives the detection signal output from the microwave sensor, and determines whether metal fibers are inserted into the original using the detection signal. And those having the following have been proposed.

In the above-described image forming apparatus, the microwave sensor is generally provided in an image reading unit having a CCD or the like for imaging, and reciprocates with the image reading unit on a document placed on a document table. Irradiation of microwaves for detecting metal fibers and detection of reflected waves. Then, the signal determination unit receives the detection signal of the reflected wave output from the microwave sensor, and determines whether or not the metal fiber is inserted into the document by using the input detection signal. It is determined whether the manuscript is a special manuscript, such as a bill or a securities, into which metal fibers have been inserted.
If it is determined that the original is a special original,
Processing such as stopping the processing for forming an image on the recording paper is performed.

[0005]

However, in the above-mentioned prior art, the original to be determined is irradiated with microwaves from a microwave sensor, and the original is detected using the detection signal of the microwave reflected by the original. In order to determine whether a document is a special document such as banknotes or securities containing metal fibers, in an environment with many disturbances, the document is scanned using electromagnetic waves other than microwaves emitted from the microwave sensor. There is a problem that it may be used to determine whether the Further, in an environment where there is a lot of disturbance, there is a problem that the detection signal for determining whether the document is a special document contains a lot of noise, so that the accuracy of the determination of the special document may be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to improve the accuracy of determination of a special document by making it possible to distinguish an electromagnetic wave used for determining whether the document is a special document from other electromagnetic waves. With the goal.

When determining whether a document is a special document,
Eliminate noise components from the detected electromagnetic wave detection signal,
It is an object of the present invention to improve the accuracy of determining a special document.

[0008]

In order to achieve the above object, a special original discriminating apparatus according to claim 1 irradiates an original to be judged with an electromagnetic wave, detects the radiated electromagnetic wave, and places a metal in the original. Determine whether the fiber is caught,
When it is determined that the metal fiber is embedded, the source of the electromagnetic wave is specified in a special original determination device that determines that the original is a special original such as a banknote or a securities, into which the metal fiber is embedded. Signal generating means for generating an identification signal for generating, a carrier wave generating means for generating a carrier wave, and modulating the carrier generated by the carrier wave generating means using the identification signal generated by the identification signal generating means. A modulating unit that generates a signal, and an irradiating unit that irradiates the document with an electromagnetic wave based on the modulated signal generated by the modulating unit.
A detection unit that detects the electromagnetic wave irradiated on the original by the irradiation unit and outputs a detection signal; a demodulation unit that receives and demodulates a detection signal from the detection unit; and a signal obtained by demodulation by the demodulation unit. Determining means for determining whether or not the signal matches the identification signal generated by the identification signal generating means.

According to a second aspect of the present invention, the identification signal generating means is capable of generating a plurality of different identification signals.

According to a third aspect of the present invention, there is provided the special original discriminating apparatus according to the first or second aspect, further comprising the steps of: The apparatus further comprises a noise erasing means for recording a level and erasing a signal of the same level as the recorded electromagnetic wave from the electromagnetic wave detected by the detecting means as noise when determining whether the document is the special original.

According to a fourth aspect of the present invention, there is provided a method for deciding a special document, wherein the document to be determined is irradiated with an electromagnetic wave, and the radiated electromagnetic wave is detected to determine whether metal fibers are embedded in the document. When it is determined that the metal fiber is embedded, in a special original determination method for determining that the original is a special original such as banknotes or securities into which the metal fiber is embedded, an electromagnetic wave source An identification signal generation step of generating an identification signal for identifying the carrier wave, a carrier wave generation step of generating a carrier wave, and using the identification signal generated in the identification signal generation step, modulating the carrier wave generated in the carrier wave generation step. A modulating step of generating a modulating signal, an irradiating step of irradiating the original with an electromagnetic wave based on the modulating signal generated in the modulating step, and detecting the electromagnetic wave applied to the original in the irradiating step. A detection step of outputting a signal, a first determination step of determining whether or not an electromagnetic wave has been detected in the detection step, and, when determining in the first determination step that an electromagnetic wave has not been detected, the document A second determination step of determining that the document is not the special original, and a demodulation step of receiving and demodulating a detection signal of the electromagnetic wave from the detection step when it is determined that the electromagnetic wave is detected in the first determination step. A third determining step of determining whether a signal demodulated in the demodulating step matches the identification signal generated in the identification signal generating step, and determining that the signals do not match in the third determining step. The document is not the special document.
And a fifth determining step of determining that the document is the special document when it is determined in the third determining step that they match.

According to a fifth aspect of the present invention, there is provided the special original discriminating method according to the fourth or fifth aspect, further comprising the step of detecting the electromagnetic wave detected in the detecting step, except during the judgment of the special original. Before the demodulation step, a noise erasing step of erasing a signal of the same level as the recorded electromagnetic wave from the electromagnetic wave detected in the detection step as noise is included before the demodulation step.

According to a sixth aspect of the present invention, there is provided a machine-readable recording medium on which a program for causing a computer to execute the special original discriminating method according to the fourth or fifth aspect is recorded.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a special original discriminating apparatus, a special original discriminating method, and a machine-readable recording medium on which a program for causing a computer to execute the method is described. This will be described in detail with reference to FIG.

FIG. 1 is a block diagram of the special original discriminating apparatus according to the present embodiment. The special document determination device of the present embodiment irradiates an electromagnetic wave such as a microwave to a document to be determined, detects the radiated electromagnetic wave, and determines whether or not metal fibers are caught in the document. When it is determined that the metal fibers are embedded, the original is determined to be a special original such as a banknote or a securities into which the metal fibers are embedded, and based on a predetermined identification code. The code generator 102 (corresponding to the identification signal generator according to claim 1) for generating an identification signal for specifying the source of the electromagnetic wave, and the carrier generator 103 for generating a carrier wave (corresponding to claim 1). Carrier generation unit) and the identification signal generated by the code generation unit 102.
A modulating section 104 (corresponding to the modulating means according to claim 1) which modulates the carrier generated in step 03 and generates a modulated signal;
Based on the modulation signal generated by the modulation unit 104, the original 10
1, a transmitting antenna 105 (corresponding to the irradiating means according to claim 1), and a receiving antenna 106 (corresponding to the detecting means according to claim 1) for detecting a reflected wave of the electromagnetic wave reflected by the document 101. ) And the receiving antenna 106
A background noise canceling unit 107 (corresponding to a noise canceling unit according to claim 3) for canceling background noise from the detection signal of the reflected wave detected in step (1), and demodulating the detection signal from which the background noise has been canceled by the background noise canceling unit 107 A demodulation unit 108 (corresponding to the demodulation means according to claim 1), a decoding unit 109 for decoding a signal obtained by demodulation by the demodulation unit 108, and a code obtained by decoding by the decoding unit 109. A determining unit 110 (corresponding to a determining unit according to claim 1) for determining whether or not the identification code matches the determined identification code, and a control unit 111 for controlling each of the above units are provided. In FIG. 1, reference numeral 112 denotes the platen 10.
2 illustrates a document size detection unit that detects the size of the document 101 placed on the document 0.

Next, a method of determining a special original in the above-described special original determining apparatus will be described. FIG. 2 is a flowchart illustrating the special original determination method according to the present embodiment.

When the special original discriminating apparatus shown in FIG. 1 is in a standby state, the background noise canceling unit 107
06 is recorded as background noise, and the original 10
When determining whether or not 1 is a special original, a background noise canceling signal for canceling background noise from the electromagnetic wave detected by the receiving antenna 106 is generated.

When the start of the special document determination process is instructed, the control unit 111 places the document 101 on the platen 100 based on the result of the detection of the document size by the document size detection unit 112. Is determined (S20).
1).

The control unit 111 controls the document 1
If it is determined that there is no “01”, the special document determination process is not executed, and the start instruction of the special document determination process is waited again.

On the other hand, if the control unit 111 determines that the original 101 is on the
And the carrier generation unit 103 is controlled to generate an identification signal and a carrier (S202: corresponds to the identification signal generation step and the carrier generation step described in claim 4).

The code generator 102 receives an instruction from the controller 111 and generates an identification signal as shown in FIG. 3 based on a predetermined identification code. The code generation unit 10
2 can generate a plurality of different identification signals, and can select a desired identification signal according to a disturbance. Further, the carrier generation unit 103 receives an instruction from the control unit 111 and generates a carrier as shown in FIG.

Subsequently, the modulating unit 104 controls the code generating unit 1
02 using the identification signal generated in
Is modulated to generate a modulation signal as shown in FIG. 5 (S203: corresponds to the modulation step in claim 4).

The transmitting antenna 105 irradiates the document 101 with an electromagnetic wave based on the modulated signal generated by the modulating unit 104 (S204: corresponds to the irradiating step in claim 4).

The receiving antenna 106 detects a reflected wave of the electromagnetic wave applied to the document 101 by the transmitting antenna 105 (corresponding to a detecting step according to claim 4). Here, the control unit 111 determines whether or not the reception antenna 106 has detected an electromagnetic wave (S205: corresponds to a first determination step in claim 4).

If the control unit 111 determines that the electromagnetic wave has not been detected by the receiving antenna 106, the control unit 111 determines that the original 101 is a general original in which metal fibers are not inserted (S211: the second original according to claim 4). Corresponds to the determination step). That is, since the electromagnetic wave could not be detected by the receiving antenna 106, it can be determined that the original 101 does not include the metal fiber that reflects the electromagnetic wave.

On the other hand, the control unit 111
If it is determined in step 6 that an electromagnetic wave has been detected, the background noise canceling unit 107 inputs a detection signal of the electromagnetic wave from the receiving antenna 106 and outputs a signal of the same level as the background noise canceling signal generated in advance from the input detection signal. (S2
06: Corresponds to the noise elimination step described in claim 5). That is, since the electromagnetic wave is detected by the receiving antenna 106, it is understood that there is a possibility that a metal fiber that reflects the electromagnetic wave may be caught in the original 101, and the special original determination process is continued.

Subsequently, the demodulation unit 108 performs the background noise canceling unit 1
In step S207, a detection signal from which background noise has been eliminated is input and demodulated (S207: corresponds to the demodulation step in claim 4).
Then, the decoding unit 109 receives and decodes the signal obtained by demodulation from the demodulation unit 108 (S208: corresponds to the demodulation step in claim 4).

The judging section 110 inputs the code decoded from the decoding section 109, and judges whether or not the input code matches a predetermined identification code (S209: the third embodiment of the present invention). This corresponds to the determination step).

If the determination unit 110 determines that they do not match, it determines that metal fibers have not been inserted into the document 101, and notifies the control unit 111 of the determination result.
Receives this, determines that the document 101 is a general document (S211: corresponds to a fourth determination step of the fourth aspect). That is, since the identification codes do not match, the electromagnetic wave detected by the receiving antenna 106 is
5, it can be determined that the electromagnetic wave is not an emitted electromagnetic wave. Therefore, it can be understood that the electromagnetic wave emitted from the transmitting antenna 105 is reflected by the original 101 and that the reflected electromagnetic wave is not detected by the receiving antenna 106 but an external electromagnetic wave is detected. It can be determined that the metal fiber to be inserted is not inserted.

On the other hand, when the determination section 110 determines that they match, it determines that metal fibers have been inserted into the document 101 and notifies the control section 111 of the determination result.
Receives this and determines that the document 101 is a special document such as a bill or a securities (S210: the fifth document in claim 4).
Corresponds to the determination step). For example, when the signal demodulated by the demodulation unit 108 is a signal as shown in FIG. 6, a code obtained by decoding the signal shown in FIG. 6 matches a predetermined identification code. It is determined that the metal fiber has been inserted into 101. That is, since the identification codes match, it can be determined that the electromagnetic wave detected by the receiving antenna 106 is an electromagnetic wave emitted from the transmitting antenna 105. Therefore, the electromagnetic wave emitted from the transmitting antenna 105 is reflected by the original 101,
It can be understood that the reflected electromagnetic wave has been detected by the receiving antenna 106, and it can be determined that the original 101 contains metal fibers that reflect the electromagnetic wave.

The special original discriminating apparatus shown in FIG. 1 can be incorporated in an image forming apparatus such as a copying machine. In a copier, when a document is determined to be a special document by the special document determination device, forgery of a special document such as banknotes or securities, for example, by interrupting copying or performing a special image forming process, is to be prevented. Can be.

As described above, according to the special original discriminating apparatus and the special original discriminating method of the present embodiment, since the electromagnetic wave for judging the special original can be distinguished from other electromagnetic waves, whether or not the original is a special original is determined. It is possible to determine whether the signal used to determine whether the signal is a signal for determining a special document or noise from the outside, thereby improving the accuracy of determining a special document.

When determining whether a document is a special document,
In order to eliminate background noise from the detection signal of the detected electromagnetic wave,
Electromagnetic waves can be received at an accurate level, and the accuracy of determination of a special document can be improved.

In the special original determination method described with reference to FIG. 2, the control unit 111 determines whether or not the reception antenna 106 has detected an electromagnetic wave. You may decide to do it. That is, for example, when the detection signal cannot be input, the determination unit 111 can determine that the reception antenna 106 has not detected the electromagnetic wave.

Further, the above-described special original discriminating method can be provided by being recorded as a special original discriminating program on a machine-readable recording medium such as a floppy disk, hard disk, CD-ROM, or DVD.

[0036]

As described above, according to the special original discriminating apparatus (claim 1) of the present invention, the identification signal generating means for generating the identification signal for specifying the source of the electromagnetic wave, and the carrier wave are used. A generating unit that generates a modulated signal by modulating a carrier generated by the carrier generating unit using the identification signal generated by the generating unit; and a modulation signal that is generated by the modulating unit. Irradiating means for irradiating the original with electromagnetic waves, detecting means for detecting the electromagnetic waves irradiated on the original by the irradiating means and outputting a detection signal, demodulating means for inputting the detection signal from the detecting means and demodulating the same, and demodulating means. Determining means for determining whether a signal obtained by demodulation matches the identification signal generated by the identification signal generating means, so that the electromagnetic wave for special document determination can be distinguished from other electromagnetic waves, and the document Special field Or signals used for determining whether a that signal for determining the special original, or it can be determined whether the noise of the external. Therefore, since the source of the electromagnetic wave can be specified, it is possible to prevent the determination of whether or not the original is a special original based on the noise, and it is possible to improve the determination accuracy of the special original. .

According to the special original discriminating apparatus of the present invention, the identification signal generating means can generate a plurality of different identification signals. An appropriate identification signal can be selected even in an environment with much disturbance.

Further, according to the special original discriminating apparatus of the present invention (claim 3), in the special original discriminating apparatus according to claim 1 or 2, the detecting means is further provided except for during the judgment of whether the document is a special original. The level of the detected electromagnetic wave is recorded, and when it is determined whether the document is a special original, a noise erasing unit for erasing a signal of the same level as the recorded electromagnetic wave from the electromagnetic wave detected by the detecting unit as noise is provided. The accuracy of document determination can be improved.

According to the special original discriminating method of the present invention (claim 4), an identification signal generating step of generating an identification signal for specifying a source of electromagnetic waves, a carrier wave generating step of generating a carrier wave, A modulating step of modulating the carrier generated in the carrier generating step using the identification signal generated in the identifying signal generating step to generate a modulation signal; and irradiating the original with electromagnetic waves based on the modulation signal generated in the modulation step. An irradiating step, a detecting step of detecting an electromagnetic wave applied to the original in the irradiating step and outputting a detection signal, a first determining step of determining whether or not the detecting step detects the electromagnetic wave, and a first determining step When it is determined that the electromagnetic wave is not detected in the second determination step, it is determined that the original is not a special original, and when it is determined that the electromagnetic wave is detected in the first determination step, the electromagnetic wave is detected from the detection step. Detection signal A demodulation step of inputting and demodulating, a third determination step of determining whether a signal demodulated in the demodulation step matches the identification signal generated in the identification signal generation step, and a third determination step The fourth determination step determines that the document is not a special document when it is determined that the document does not match the first document, and the fourth process determines that the document is a special document when the third document determines that the document is not the special document. 5, the electromagnetic wave for special document determination can be distinguished from other electromagnetic waves, and whether the signal used to determine whether the document is a special document or not is a signal for special document determination, Or it can be determined whether the noise is external. Therefore,
Since the source of the electromagnetic wave can be specified, it is possible to prevent the determination as to whether or not the original is a special original based on the noise, and it is possible to improve the determination accuracy of the special original.

According to the special original judging method of the present invention (claim 5), in the special original judging method according to claim 4, furthermore, the special original is detected in the detecting step except during the judgment as to whether the original is a special original. The level of the electromagnetic wave is recorded, and before the demodulation step, a noise elimination step of erasing the signal of the same level as the recorded electromagnetic wave from the electromagnetic wave detected in the detection step as noise is included. Can be planned.

Further, according to the machine-readable recording medium of the present invention (claim 6), a program for causing a computer to execute the special original discriminating method described in claim 4 or 5 is recorded, and is stored in the computer. By executing this, the electromagnetic wave for special document determination can be distinguished from other electromagnetic waves, and whether the signal used to determine whether or not the document is a special document is a signal for special document determination or noise from the outside. Can be determined. Therefore, since the source of the electromagnetic wave can be specified, it is possible to prevent the determination of whether or not the original is a special original based on the noise, and it is possible to improve the determination accuracy of the special original. .

[Brief description of the drawings]

FIG. 1 is a block diagram of a special original discriminating apparatus according to an embodiment.

FIG. 2 is a flowchart illustrating a special original determination method according to the present embodiment.

FIG. 3 is an explanatory diagram illustrating an identification signal generated by a code generation unit in the special original discriminating apparatus of the present embodiment.

FIG. 4 is an explanatory diagram illustrating a carrier generated by a carrier generator in the special original discriminating apparatus of the present embodiment.

FIG. 5 is an explanatory diagram illustrating a modulated signal modulated by a modulation unit in the special original discriminating apparatus of the present embodiment.

FIG. 6 is an explanatory diagram illustrating signals demodulated by a demodulation unit in the special original discriminating apparatus according to the present embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 platen 101 document 102 code generation unit 103 carrier generation unit 104 modulation unit 105 transmission antenna 106 reception antenna 107 background noise elimination unit 108 demodulation unit 109 decoding unit 110 determination unit 111 control unit 112 document size detection unit

Claims (6)

[Claims] An original document to be determined is irradiated with electromagnetic waves,
The irradiated electromagnetic wave is detected to determine whether or not metal fibers are embedded in the original.If it is determined that the metal fibers are embedded, the original is inserted into the original. A special manuscript judging device for judging that the manuscript is a special manuscript such as bills and securities, an identification signal generating means for generating an identification signal for specifying a source of electromagnetic waves, a carrier wave generating means for generating a carrier wave, A modulating unit that modulates the carrier generated by the carrier generating unit using the identification signal generated by the identifying signal generating unit to generate a modulation signal; and an electromagnetic wave generated on the document based on the modulation signal generated by the modulation unit. Irradiating means for irradiating, the detecting means for detecting the electromagnetic wave irradiated on the document by the irradiating means, and outputting a detection signal, and a demodulating means for inputting and demodulating a detection signal from the detecting means, A determination unit configured to determine whether a signal demodulated by the demodulation unit matches an identification signal generated by the identification signal generation unit. 2. The special original discriminating apparatus according to claim 1, wherein said identification signal generating means can generate a plurality of different identification signals. 3. The level of the electromagnetic wave detected by the detection unit is recorded except when the determination unit determines that the document is the special document, and the determination unit determines whether the document is the special document. 3. The special original document judging device according to claim 1, further comprising a noise erasing unit for erasing a signal of the same level as the recorded electromagnetic wave from the detected electromagnetic wave as noise. 4. An original document to be determined is irradiated with electromagnetic waves,
The irradiated electromagnetic wave is detected to determine whether or not metal fibers are embedded in the original.If it is determined that the metal fibers are embedded, the original is inserted into the original. A special manuscript judging method for judging that the manuscript is a special manuscript such as banknotes or securities, an identification signal generating step of generating an identification signal for specifying a source of electromagnetic waves, a carrier wave generating step of generating a carrier wave, A modulation step of modulating the carrier generated in the carrier generation step to generate a modulation signal using the identification signal generated in the identification signal generation step; and generating an electromagnetic wave on the document based on the modulation signal generated in the modulation step. An irradiation step of irradiating the document; a detection step of detecting an electromagnetic wave applied to the document in the irradiation step and outputting a detection signal; and a first step of determining whether the detection step detects the electromagnetic wave.
And a second determining step of determining that the document is not the special document when it is determined in the first determining step that no electromagnetic wave has been detected; and When it is determined that the detection has been detected, a demodulation step of inputting and demodulating the detection signal of the electromagnetic wave from the detection step, a signal obtained by demodulation in the demodulation step, the identification signal generated in the identification signal generation step, A third determination step of determining whether or not they match, and if it is determined that they do not match in the third determination step,
A fourth determining step of determining that the original is not the special original, and a fifth determining step of determining that the original is the special original when it is determined that the originals match in the third determining step. A special manuscript judging method comprising: 5. The method according to claim 1, further comprising: recording a level of the electromagnetic wave detected in the detecting step, excluding a step of determining whether the document is the special original, and before the demodulating step, determining a level of the electromagnetic wave detected in the detecting step. 5. The method according to claim 4, further comprising the step of erasing a signal having the same level as the recorded electromagnetic wave as noise. 6. A machine-readable recording medium having recorded thereon a program for causing a computer to execute the special original discriminating method according to claim 4 or 5.