JP2001176011A - Device and method for reading magnetic pattern, and information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic pattern recognition device, its method and an information recording medium. SOLUTION: In the device, a storage part stores a plurality of characters or signs and the values of magnetic fluxes at the positions of a plurality of feature points, which are respectively made to correspond to the respective characters or signs, a measuring part detects the magnetic fluxes of the magnetic pattern printed with a magnetic ink and a recognition output part compares the detected magnetic fluxes with the stored values of the fluxes at the positions of the plurality of feature points and outputs the characters or signs made to correspond to the magnetic fluxes at the positions of the plurality of feature points which satisfy a specified condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic pattern reading device, a reading method, and a computer readable information recording medium on which a program for realizing the same is recorded.

[0002] In particular, MICR (Magnetic Ink Character Recog) using magnetic ink having various magnetic properties.
nition) characters and MICR symbols (hereinafter collectively referred to as “MI
CR character ". The present invention relates to a magnetic pattern reading device and a reading method suitable for reading in order to recognize), and a computer readable information recording medium on which a program for realizing these is recorded.

[0003]

2. Description of the Related Art Conventionally, for example, a magnetic recognition device that prints MICR characters on a personal check or the like and recognizes the characters has been used. FIG. 1 shows a print example of a personal check in which MICR characters are printed. “Symbol 012345678 Symbol printed at the bottom of the figure
Blank 9012 Symbol 3456789 Symbol Blank 0
The column of "123 blank symbol 4567890123 symbol" is a portion printed with MICR characters.

[0004] For MICR characters, see ANSI X9.27-1.
995, ISO 1004 Information processing-Magnetic in
k character recognition-Print Specifications, JI
SX9002-1980 Standards are defined by magnetic ink character reading fonts and printing specifications (E13B). MICR character shapes and their magnetic properties, especially M
The shape of the magnetic waveform when an ICR character is read by a magnetic head is determined by the CMC7 standard or the E13B standard.

On the other hand, toners containing magnetic ink for MICR characters have been provided for laser printers. Further, similar inks are provided in ink jet printers and thermal transfer printers. By using such toner and ink, a user can print MICR characters on a paper such as a personal check using an inexpensive consumer printer.

In the past, MICR characters were printed by a dedicated printing device conforming to a predetermined standard, but today, MICR characters are printed by inexpensive consumer printers of various DPIs (dot per inch). It is becoming.

According to a predetermined standard, each character is characterized by the strength of the residual magnetic flux of the MICR character (so-called magnet system), while each character is read by a mutual induction change when a predetermined magnetic field is applied (so-called bias). System) devices are also widespread.

[0008] As described above, the technology of printing and recognizing MICR characters has been widely spread in the future, and the related technology has become more and more important.

[0009]

However, as the printing of MICR characters has been performed by consumer printers of various DPIs, the following problems have arisen.

[0010] That is, as various magnetic inks are used for consumer use, the magnetic characteristics of the magnetic ink vary.

In particular, as the magnetic material characteristics of the magnetic ink become various, there arises a problem that a mutual induction change becomes various particularly in reading a magnetic pattern by a bias method, and as a result, there is a possibility that a difference occurs in an output. I was

FIG. 2 is an explanatory diagram showing the magnetic properties of the magnetic material of the ink in which such a problem occurs. The graph shown in FIG. 2 shows hysteresis curves of two types of magnetic inks, “old ink” (a magnetic ink that has been used conventionally) and “laser printing” (a magnetic ink that has recently been used).

In the magnet system, in order to detect residual magnetic flux,
Although the difference between the two types of magnetic ink is small, the difference between the two values is large in the bias method because the mutual induction change when a predetermined magnetic field is applied is detected.

In magnetic reading, an electric signal of a magnetic pattern read by a magnetic head is amplified by an amplifier, but when the amplification factor is adjusted for "old ink", the magnetic ink of "laser printing" is When trying to read the pattern, there has been a problem that the value of the mutual induction change becomes too large and the dynamic range is saturated.

If the line thickness of the MICR character does not conform to the DPI of the printer, the line width and character spacing of the printed MICR character vary. This variation has a correlation, the variation occurs in the residual magnetic flux density of the magnetic pattern or the mutual induction change,
There has been a problem that recognition accuracy is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a magnetic pattern reading device, a reading method, and a computer readable information recording medium on which a program for realizing the same is recorded. With the goal.

In particular, a magnetic pattern reading device, a reading method, and a reading method suitable for reading MICR characters by using magnetic inks having various magnetic properties are provided.
An object of the present invention is to provide a computer-readable information recording medium on which a program for realizing these is recorded.

[0018]

In order to achieve the above object, the following invention is disclosed in accordance with the principle of the present invention.

The magnetic pattern reading device of the present invention includes a measuring unit, an amplifying unit, an output unit, and a re-execution control unit.

The measuring section measures the residual magnetic flux density of the magnetic pattern printed by the magnetic ink, and outputs a signal corresponding to the residual magnetic flux density.

The amplification section is variable in amplification factor and amplifies the signal output from the measurement section.

The output section outputs the amplified signal when the signal amplified by the amplifier section is not saturated with respect to the dynamic range.

When the signal amplified by the amplifying unit is saturated with respect to the dynamic range, the re-execution control unit changes the amplification factor of the amplifying unit and causes the measuring unit to execute the measurement again.

A magnetic pattern reading device according to the present invention includes a measurement unit, an amplification unit, a division unit, a re-execution control unit, and an output unit.

The measuring section measures the residual magnetic flux density of the magnetic pattern printed by the magnetic ink, and outputs a signal corresponding to the residual magnetic flux density.

The amplification section is variable in amplification factor and amplifies the signal output from the measurement section.

The divider divides the signal amplified by the amplifier into predetermined sections.

The re-execution control unit determines, for each of the sections divided by the dividing unit, whether or not the signal amplified by the amplifying unit is saturated with respect to the dynamic range. Is changed, and the measurement unit performs the measurement again.

The output section outputs the amplified signal when the signal amplified by the amplification section is not saturated with respect to the dynamic range in all the sections divided by the division section.

Further, the measuring section of the magnetic pattern reader of the present invention can be configured to measure a mutual induction change when a predetermined magnetic field is applied to the magnetic pattern.

Further, the amplification factor can be changed by the re-execution control unit of the magnetic pattern reading apparatus of the present invention by lowering the amplification factor.

Further, in the magnetic pattern reading device of the present invention, the magnetic pattern may be a MICR character or a MICR character.
It can be configured to be a CR symbol.

According to the magnetic pattern reading method of the present invention, there are provided a measuring step, an amplifying step, an output step, a re-execution controlling step,
Is provided.

In the measuring step, the residual magnetic flux density of the magnetic pattern printed with the magnetic ink is measured, and a signal corresponding to the residual magnetic flux density is output.

In the amplification step. The signal output in the measurement step is amplified.

In the output step, when the signal amplified in the amplification step is not saturated, the amplified signal is output.

In the re-execution control step, when the signal amplified in the amplification step is saturated with respect to the dynamic range, the amplification factor in the amplification step is changed, and the measurement step is executed again.

The magnetic pattern reading method of the present invention includes a measuring step, an amplifying step, a dividing step, a re-execution control step, and an output step.

In the measuring step, the residual magnetic flux density of the magnetic pattern printed with the magnetic ink is measured, and a signal corresponding to the residual magnetic flux density is output.

In the amplification step, the signal output in the measurement step is amplified.

In the dividing step, the signal amplified in the amplifying step is divided into predetermined sections.

In the re-execution control step, for each of the sections divided in the dividing step, it is determined whether or not the signal amplified in the amplifying step is saturated with respect to the dynamic range. Then, the amplification factor in the amplification step is changed and the measurement step is executed again.

In the output step, when the signal amplified in the amplification step is not saturated with respect to the dynamic range in all the sections divided in the division step, the amplified signal is output.

Further, in the measuring step of the magnetic pattern reading method of the present invention, it is possible to measure a mutual induction change when a predetermined magnetic field is applied to the magnetic pattern.

Further, the amplification factor can be changed in the re-execution control step of the magnetic pattern reading method of the present invention by lowering the amplification factor.

In the method for reading a magnetic pattern according to the present invention, the magnetic pattern may be a MICR character or a MICR character.
It can be configured to be a CR symbol.

A program for realizing the magnetic pattern reading device and the reading method of the present invention is recorded on an information recording medium such as a compact disk, a floppy disk, a hard disk, a magneto-optical disk, a digital video disk, a magnetic tape, and a semiconductor memory. be able to.

The program recorded on the information recording medium of the present invention is loaded into a CPU (Cent
By executing the control by a control device such as a ral processing unit (central processing unit), the above-described magnetic pattern reading device and reading method can be realized.

Further, independently of these devices, an information recording medium on which the program of the present invention is recorded can be distributed and sold.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. The embodiments described below are for explanation, and do not limit the scope of the present invention. Therefore, those skilled in the art can adopt embodiments in which each of these elements or all elements are replaced with equivalents, but these embodiments are also included in the scope of the present invention.

(First Embodiment) FIG. 3 is an explanatory diagram showing a schematic configuration of a first embodiment of a magnetic pattern reading apparatus according to the present invention. Hereinafter, a schematic configuration of a first embodiment of a magnetic pattern reading device according to the present invention will be described with reference to FIG.

The reading device 101 of the present invention comprises a measuring unit 102
, Amplifying section 103, output section 104, re-execution control section 1
05.

The measuring unit 102 measures a residual magnetic flux density or a mutual induction change (hereinafter, magnetic flux) of the magnetic pattern printed by the magnetic ink, and outputs a signal corresponding to the magnetization.

The amplification section 103 has a variable amplification factor and amplifies the signal output from the measurement section 102.

When the signal amplified by the amplifier 103 is not saturated with respect to the dynamic range, the output unit 104
The amplified signal is output.

When the signal amplified by the amplification unit 103 is saturated, the re-execution control unit 105 changes the amplification factor of the amplification unit 103 and causes the measurement unit 102 to execute the measurement again.

FIG. 4 is a block diagram showing a schematic configuration in a case where a magnetic pattern reader having the schematic configuration shown in FIG. 3 is realized by actual hardware.

The CPU 301 of the reading device 101 controls each section of the reading device.

The paper feeder 302 moves a sheet on which MICR characters are printed, for example, a personal check, relative to the magnetic head 303.

The magnetic flux read by the magnetic head 303 is amplified by the amplifier circuit 304, and the filter circuit 305 removes unnecessary signals. Further, the magnetic flux is converted into a digital signal by an A / D (Analog / Digital) converter 306 and sent to the CPU 301.

The digital signal of the magnetic flux intensity received by the CPU 301 is stored in the RAM 307.

The value stored in the RAM 307 is
As determined by 301, if this is saturated for the dynamic range, CPU 301 controls the amplifier to reduce its amplification factor and perform the measurement again.

The CPU 301 drives the paper feeder 302, detects the magnetic flux by the magnetic head 303, stores the digital signal of the detected magnetic flux in the RAM 307, and performs re-measurement if necessary.

Thereafter, the character or symbol is recognized by comparing the result of reading the magnetic pattern with this value and the magnetic pattern stored in the ROM 308. The recognized characters and symbols are stored in the RAM 307 or the like, and are subjected to other processing. For example, the recognized characters and symbols are interpreted as a bank account number and a money amount, and a transaction of a withdrawal process of the money amount is performed. For this processing, a known technique can be used.

The magnetic head 303 serves as a measuring unit, and the amplifier 304 serves as an amplifying unit.
Function as an output unit and a re-execution control unit, respectively.

The ROM 308 stores the CPU 30
1 can store a program to be executed, and in this case, the ROM 308 functions as the information recording medium of the present invention.

Further, when the contents of the ROM 308 can be externally updated, an information recording medium such as a CD-ROM (Compact Disc ROM) on which a program for updating is recorded functions as the information recording medium of the present invention. I do.

FIG. 5 is an explanatory diagram showing an outline of a multifunction device incorporating a reading device according to the present embodiment and a printer.

The printer unit of the combined processing 401 includes a printer head 402 for printing characters and symbols, a moving shaft 403 for moving the head, and a platen 404 for holding paper during printing. It is done for.

On the other hand, the personal check 411 on which the MICR characters are printed is inserted from the insertion slot 412, and is processed by the recognition device 101 arranged inside the multifunction device 401.

FIG. 6 is a flowchart showing the flow of a reading process executed in the reading apparatus of the present embodiment.
The reading process is started when a personal check sheet is inserted. An embodiment in which the insertion is detected by an optical sensor or the like, or an embodiment in which the user inputs some instruction to the CPU 301 after the insertion can be adopted.

First, the CPU 301 controls the paper feed mechanism 30
2 and the magnetic head 303 is operated to read the magnetic pattern printed on the paper, and the signal of the read result is amplified by the amplifier 304 set to a predetermined amplification factor.
, And further, a filter circuit 30
5 to remove noise, and A / D converter 306 to remove A
The D / A conversion is performed, and the converted data is stored in the RAM 307 (step S501).

Data can be read, for example, by the following method. The paper feed mechanism 302 includes 1
/ Send paper in steps of 144 inches. The magnetic head 303 measures the magnetic flux 15 times per step. The measured values are averaged every four times, and this data sequence is
M 307.

The MICR character conforms to MI13 in the E13B standard.
The width of CR characters is classified into four groups from 1.321 mm to 2.311 mm. In this case, about 49 data are equivalent to the width of one MICR character, but the printing interval is 3.175 mm, and about 70 data including the space between characters can be stored as data for one character.

Next, the CPU 301 checks whether or not the read data string of the magnetic flux is saturated with respect to the dynamic range (step S502).

For example, consider a case where one magnetic flux data is stored in one byte. When the value of the magnetic flux is 0, the byte value is set to 128, when the value of the magnetic flux is positive, the byte value is set to 129 to 255, and when the value of the magnetic flux is negative, the byte value is set to 0 to 127. To remember.

Here, the case of saturation is as follows. -When the byte value 255 appears. -When byte value 0 appears. When not saturated, the value of the magnetic flux stored in the RAM 307 has a byte value from 1 to 254.

If not saturated (step S502;
No), the data string of the magnetic flux stored in the RAM 307 is output as a result (step S503), and the reading process ends.

Note that the output method is as follows.
The reading result can also be output in a form in which the value is left as it is in 307.

On the other hand, if it is saturated (step S50)
3; Yes), the CPU 301 controls the amplifier 304 to reduce its amplification factor (step S504).

As a method of decreasing the amplification factor, a method of decreasing the amplification factor at a predetermined ratio, such as setting the amplification factor to 4/5 at present, can be used. Also, the amplifier 304
However, in the case of an amplifier whose amplification factor can be changed stepwise, a method of lowering the amplification factor by one stage can be used.

After the amplification rate has been reduced in step S504, the flow returns to step S501, and reading is performed again.

After the completion of the main reading process, for example, the following process can be performed. JP-A-9-311906
The data corresponding to the section considered to be each character is cut out from the read data by a technique disclosed in Japanese Patent Application Laid-Open Publication No. H10-15095.

Next, in each of the cut sections, the distribution of the stored magnetic flux is 129 to 254 when the value of the magnetic flux is positive. The value of the magnetic flux is converted by a linear expression so that the distribution of
307.

Next, for each section, the CPU 301 compares each of the magnetic patterns of the characters stored in the ROM 308 with the data of the section to recognize the MICR character.

A known technique can be used for the method after the end of the main reading process.

In this embodiment of the reading process, a relatively large amplification factor is set in the amplifier 304 at first.
While the dynamic range is saturated, the method of reducing the amplification factor is used, but on the contrary, initially set a small amplification factor, gradually increase the amplification factor, and when saturated, the amplification immediately before It is also possible to adopt a technique that employs a measured value at a rate. Further, these methods can be combined.

(Second Embodiment) FIG. 7 is an explanatory diagram showing a schematic configuration of a second embodiment of a magnetic pattern reading apparatus according to the present invention. Note that, in FIG. 7, the same elements as those in the above-described embodiment are denoted by the same reference numerals.

Hereinafter, a schematic configuration of a magnetic pattern reading apparatus according to a second embodiment of the present invention will be described with reference to FIG.

A magnetic pattern reader 101 according to the present invention.
Are a measuring unit 102, an amplifying unit 103, and a dividing unit 111
, A re-execution control unit 112, and an output unit 104.

The measuring section 102 measures the magnetic flux of the magnetic pattern printed by the magnetic ink and outputs a signal corresponding to the magnetic flux.

The amplification unit 103 has a variable amplification factor, and amplifies the signal output from the measurement unit 102.

[0093] Dividing section 111 divides the signal amplified by amplifying section 103 into predetermined sections.

The re-execution control unit 112 determines whether or not the signal amplified by the amplifying unit 103 is saturated with respect to the dynamic range for each of the sections divided by the dividing unit 111. Then, the amplification factor of the amplification unit 103 is changed, and the measurement unit 102 performs the measurement again.

Output section 104 outputs the amplified signal when the signal amplified by amplification section 103 is no longer saturated in all sections divided by division section 111.

Note that the same hardware configuration as that of the above-described embodiment can be adopted as the hardware configuration for implementing this embodiment.

Here, the magnetic head 303 is
2, the amplifier 304 includes the CP
The U 301 functions as the dividing unit 111, the output unit 104, and the re-execution control unit 112, respectively.

FIG. 8 is a flowchart showing the flow of a reading process executed in the reading apparatus of this embodiment.
This reading process is started when a personal check sheet is inserted, similarly to the above-described embodiment.

First, the CPU 301 controls the paper feed mechanism 30
2 and the magnetic head 303 is operated to read the magnetic pattern printed on the paper, and the signal of the read result is amplified by the amplifier 304 set to a predetermined amplification factor.
, And further, a filter circuit 30
5 to remove noise, and A / D converter 306 to remove A
The D / D conversion is performed, and the converted data is stored in the RAM 307 (step S801).

The method of reading data is the same as in the above embodiment.

Next, the CPU 301 divides the read magnetic flux data string into a plurality of sections (step S80).
2). In the division, for example, the data string is divided into sections considered to represent each character by a method disclosed in Japanese Patent Application Laid-Open No. 9-311906.

Next, the CPU 301 determines whether or not the division has succeeded (step S803), and if the division has been completed (step S803; Yes), the CPU 301
Sets an "unread" flag for all sections (step S805). This flag is stored in RAM
307.

Further, the CPU 301 repeats the following steps S807 to S809 for each of the sections for which the “unread” flag is set (step S806).

That is, the CPU 301 checks whether or not the magnetization data string in the section is saturated (step S807). This criterion is the same as in the above-described embodiment.

If not saturated (step S807;
No), the “read” flag is set for the section (step S808).

If saturated (step S807; Y
es), an “unread” flag is set for the section (step S809).

Next, the CPU 301 checks whether or not a section in which the “unread” flag is set remains (step S810). If there is no remaining (step S81
0; No), the data string stored in the RAM 307 is output as a read result (step S811), and the process ends. The output method is the same as in the above embodiment.

On the other hand, if an “unread” section remains (step S810; Yes), the CPU 301 changes the amplification factor of the amplifier 304 in the same manner as in the above-described embodiment (step S812), and then proceeds to step S801. Similarly, the magnetic flux of the magnetic pattern is read again (step S813).
However, the value of the magnetic flux read only in the “unread” section is written in the RAM 307.

By this processing, the value of the magnetic flux stored corresponding to each section can be made as large as possible, and the influence of noise can be made as small as possible.

After rereading in step S812,
It returns to step S806.

On the other hand, if the division fails in step S803 (step S803; No), the amplifier 304
Is changed in the same manner as in the above-described embodiment (step S814), and the process returns to step S801.

In the second embodiment, even if a part of the read data has a saturated portion, if the portion can be divided into sections corresponding to each MICR character, it is divided and whether or not each section is saturated is determined. Determine. Only for the section that is saturated,
Since the reading is performed again, the value of the magnetic flux as large as possible in each section can be read. Therefore, the influence of noise can be reduced.

Note that the first and second embodiments can be used in combination with each other.

In the above description, the personal check is used.
It goes without saying that the present invention is effective for R-printed objects.

[0115]

As described above, according to the present invention,
It is possible to provide a magnetic-pattern reading device, a reading method, and a computer-readable information recording medium on which a program for realizing these devices is recorded.

In particular, a magnetic pattern reading device, a reading method, and a reading method suitable for reading MICR characters by using magnetic inks having various magnetic characteristics.
It is possible to provide a computer-readable information recording medium on which a program for realizing these is recorded.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a personal check on which MICR characters are printed.

FIG. 2 is an explanatory diagram showing magnetic characteristics of various magnetic inks.

FIG. 3 is a block diagram showing a schematic configuration of a first embodiment of a magnetic pattern reader according to the present invention.

FIG. 4 is a block diagram showing a hardware configuration of a magnetic pattern reading apparatus according to the present invention.

FIG. 5 is an explanatory diagram showing an outline of a multifunction device incorporating a magnetic pattern reading device and a printer according to the present invention.

FIG. 6 is a flowchart showing a flow of a reading process executed in the reading device of the first embodiment of the magnetic pattern of the present invention.

FIG. 7 is a block diagram showing a schematic configuration of a magnetic pattern reading apparatus according to a second embodiment of the present invention.

FIG. 8 is a flowchart showing a flow of a reading process executed in the reading device of the second embodiment of the magnetic pattern of the present invention.

[Explanation of symbols]

 Reference Signs List 101 reading device 102 measuring unit 103 amplifying unit 104 output unit 105 re-execution control unit 111 division unit 112 re-execution control unit 301 CPU 302 paper feeding mechanism 303 magnetic head 304 amplifying circuit 305 filter circuit 306 A / D converter 307 RAM 308 ROM 401 multifunction device 402 printer head 403 moving axis 404 platen 405 roll paper 411 personal check 412 insertion slot

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C005 HA26 JA03 LB04 5B072 AA02 BB00 CC02 CC27 CC38 DD00 DD05 JJ01 5D091 AA20 BB06 DD30 HH20

Claims (16)

[Claims] 1. A measuring section for measuring a residual magnetic flux density of a magnetic pattern printed by magnetic ink and outputting a signal corresponding to the residual magnetic flux density, and a variable amplification amplification for amplifying a signal output by the measuring section. An output unit that outputs the amplified signal when the signal amplified by the amplification unit is not saturated with respect to the dynamic range; and an amplification factor of the amplification unit when the signal amplified by the amplification unit is saturated. And a re-execution control unit for causing the measurement unit to execute the measurement again by changing the following. 2. A measuring section for measuring a residual magnetic flux density of a magnetic pattern printed with magnetic ink and outputting a signal corresponding to the residual magnetic flux density, and a variable amplification factor for amplifying a signal output by the measuring section. Amplifying section, a dividing section for dividing the signal amplified by the amplifying section into predetermined sections, and for each of the sections divided by the dividing section,
It is determined whether or not the signal amplified by the amplifying unit is saturated with respect to the dynamic range. If the signal is saturated, the amplification factor of the amplifying unit is changed for the section and the measuring unit is caused to perform the measurement again. A magnetic pattern comprising: an execution control unit; and an output unit that outputs the amplified signal when the signal amplified by the amplification unit is not saturated for all the sections divided by the division unit. Reading device. 3. The magnetic pattern reader according to claim 1, wherein the measuring unit measures a mutual induction change when a predetermined magnetic field is applied to the magnetic pattern. 4. The magnetic pattern reading device according to claim 1, wherein the change of the amplification factor by the re-execution control unit is performed by lowering the amplification factor. 5. The magnetic pattern according to claim 1, wherein the magnetic pattern is a MICR character or a MICR symbol.
The magnetic pattern reader according to any one of claims 1 to 4. 6. A measuring step of measuring a residual magnetic flux density of a magnetic pattern printed with magnetic ink and outputting a signal corresponding to the residual magnetic flux density, and an amplifying step of amplifying a signal output in the measuring step. An output step of outputting the amplified signal when the signal amplified in the amplification step is not saturated with respect to a dynamic range; and an output step of outputting the amplified signal in the amplification step when the signal amplified in the amplification step is saturated. And a re-execution control step of re-executing from the measurement step by changing the amplification factor in. 7. A measuring step of measuring a residual magnetic flux density of a magnetic pattern printed with magnetic ink and outputting a signal corresponding to the residual magnetic flux density, and an amplifying step of amplifying a signal output in the measuring step. And a dividing step of dividing the signal amplified in the amplifying step into predetermined sections; and for each of the sections divided in the dividing step,
It is determined whether the signal amplified in the amplification step is saturated with respect to the dynamic range. If the signal is saturated, the amplification factor in the amplification step is changed and the measurement step is executed again for the section. Re-execution control step, and when the signal amplified in the amplification step is not saturated for all sections divided in the division step,
An output step of outputting the amplified signal. A method for reading a magnetic pattern, comprising: 8. The magnetic pattern reading method according to claim 6, wherein in the measuring step, a mutual induction change when a predetermined magnetic field is applied to the magnetic pattern is measured. 9. The magnetic pattern reading method according to claim 6, wherein the change of the amplification factor in the re-execution control step is performed by lowering the amplification factor. 10. The magnetic pattern reading method according to claim 6, wherein the magnetic pattern is an MICR character or a MICR symbol. 11. A measurement procedure for measuring a residual magnetic flux density of a magnetic pattern printed with magnetic ink and outputting a signal corresponding to the magnetization, an amplification procedure for amplifying a signal output in the measurement procedure, An output step of outputting the amplified signal when the signal amplified in the amplification step is not saturated with respect to a dynamic range; and an amplification step in the amplification step when the signal amplified in the amplification step is saturated. And a re-execution control procedure for changing the rate and re-executing from the measurement procedure. 12. A measurement procedure for measuring a residual magnetic flux density of a magnetic pattern printed with magnetic ink and outputting a signal corresponding to the magnetization, an amplification procedure for amplifying the signal output in the measurement procedure, A division procedure of dividing the signal amplified in the amplification procedure into predetermined sections, and for each of the sections divided in the division procedure,
It is determined whether the signal amplified in the amplification procedure is saturated with respect to the dynamic range. If the signal is saturated, the amplification factor in the amplification procedure is changed and the measurement procedure is executed again for the section. Re-execution control procedure, and if the signal amplified in the amplification procedure for all sections divided in the division procedure is no longer saturated,
An output procedure for outputting the amplified signal; and a computer-readable information recording medium recording a program for executing processing including: 13. The computer-readable information recording apparatus according to claim 11, wherein in the measuring procedure, a mutual induction change when a predetermined magnetic field is applied to the magnetic pattern is measured. Medium. 14. The method according to claim 11, wherein the change of the amplification factor by the re-execution control procedure is performed by lowering the amplification factor.
3. A computer-readable information recording medium on which the program according to any one of 3 is recorded. 15. The computer readable information recording medium according to claim 11, wherein the magnetic pattern is a MICR character or a MICR symbol. 16. The information recording medium according to claim 11, wherein the information recording medium is a compact disk, a floppy disk, a hard disk, a magneto-optical disk, a digital video disk, a magnetic tape, or a semiconductor memory. A computer-readable information recording medium on which the program according to the item is recorded.