JP2000132682A - Device and method for collating pattern and computer- readable storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability in the signature authentication of a person who uses a system such as a computer. SOLUTION: The person, who signs, uses a vibration input pen 3 and signs by bringing a pen tip 5 into contact with a vibration transmitting board 8. In this case, a prescribed ultrasonic vibration is added to the pen tip 5 by a driving signal from an arithmetic control circuit 1. The vibration is detected by vibration sensors 6a-6d, the arithmetic control circuit 1 calculates the movement locus of the pen tip 5 by the arrival times of the vibration to the sensors and also the tool forces and wave length detection errors or the like of the sensors at that time are detected. A host computer 10 judges the truth or false of the signature by respectively comparing the movement locus, the tool forces and the wave length detection errors with previously registered information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern matching device and method for matching a pattern registered in advance with a pattern input by a user, and a computer-readable storage medium used for the same. It is used for authentication and the like.

[0002]

2. Description of the Related Art Conventionally, as a method of authenticating an individual in a computer or the like, verification using a user ID or a password has been generally performed. On the other hand, a signature is generally used as a means for confirming the identity of a credit card, such as personal identification. In recent years, the trend of applying this signature to computer devices has become active. In particular, in network settlement such as online shopping using the Internet and data access control in an intranet, authentication using only a password may be stolen by another person. Therefore, a highly reliable authentication system is desired.

Attention has been paid to a signature authentication system based on pen input. This system consists of an electromagnetic induction type or pressure sensitive type pen input device, which checks information that shows individual differences such as pen movement, writing order, speed, pen pressure etc. during signing process. It is. Then, the authenticity is determined by comparing the information with the handwriting information registered in advance.

[0004]

However, although the data used for signature authentication to date is an important device in security, only data used for pen input operation of a writing instrument such as a ball-point pen and a mechanical pen is used. Are dealing. Specifically, the above are handwriting, input speed, pen pressure, and the like. That is, since only information at the time of general pen input operation is handled, the operator has some knowledge about data used in the signature authentication system,
By carefully observing the operation at the time of input, it is possible to imitate data input. That is, "spoofing" by another person is possible. For this reason, it is possible that the user falsely enters the network and illegally obtains or destroys data. Therefore, the system on the receiving side needs to have a function excellent in reliability and security to confirm the partner.

[0005] The present invention has been made in view of the above circumstances, and has as its object to improve the reliability and security of signature authentication.

[0006]

In order to achieve the above object, in a pattern matching device according to the present invention, a vibration transmitting plate for transmitting vibration, and the vibration transmitting plate moving while being in contact with the vibration transmitting plate. Vibration input means for inputting vibration to the transmission plate, vibration detection means for detecting vibration transmitted from the vibration input means through the vibration transmission plate, and vibration detection means on the vibration transmission plate based on the vibration detected by the vibration detection means. Position calculation means for calculating the position of the vibration input means and outputting the position coordinates thereof, and contact pressure detection means for detecting a contact pressure of the moving vibration input means based on the vibration detected by the vibration detection means, An error detection means for detecting a wavelength detection error of the vibration detection means, and a pattern depicting a series of the position coordinates calculated by the position coordinate calculation means with the movement of the vibration input means. A first comparing means for comparing a predetermined pattern with a predetermined pattern; a second comparing means for comparing the contact pressure information detected by the contact pressure detecting means with predetermined contact pressure information; and a wavelength detected by the error detecting means. Third comparison means for comparing the detection error information with predetermined wavelength detection error information is provided.

Further, in the pattern matching method according to the present invention, the vibration transmitted through the vibration transmitting plate from the vibration input means for inputting vibration to the vibration transmitting plate while moving on the vibration transmitting plate is detected. Vibration detection procedure,
A position calculating step of calculating the position of the vibration input means on the vibration transmission plate based on the vibration detected by the vibration detecting step and outputting the position coordinates thereof; and The contact pressure detection procedure for detecting the contact pressure of the moving vibration input means, the error detection procedure for detecting the wavelength detection error of the vibration detection procedure, and the position coordinate calculation procedure are calculated with the movement of the vibration input means. A first comparing step of comparing a pattern drawn by the sequence of position coordinates with a predetermined pattern, and a second comparing means of comparing the contact pressure information detected by the contact pressure detecting step with predetermined contact pressure information. And a third comparison procedure for comparing the wavelength detection error information detected by the error detection procedure with predetermined wavelength detection error information.

Further, in the storage medium according to the present invention, the vibration for detecting vibration transmitted through the vibration transmission plate from the vibration input means for inputting vibration to the vibration transmission plate while moving while contacting the vibration transmission plate. A detection process, a position calculation process of calculating the position of the vibration input means on the vibration transmission plate based on the vibration detected by the vibration detection vibration and outputting the position coordinates thereof, and a vibration detected by the vibration detection process A contact pressure detecting process for detecting a contact pressure of the moving vibration input means based on the above, an error detecting process for detecting a wavelength detection error in the vibration detecting procedure, and calculating the position coordinates with the movement of the vibration input means. A first comparison process for comparing a pattern drawn by the series of position coordinates calculated by the process with a predetermined pattern; and a contact pressure information detected by the contact pressure detection process and a predetermined contact A program for executing a second comparison process for comparing pressure information and a third comparison process for comparing wavelength detection error information detected by the error detection process with predetermined wavelength detection error information is stored. ing.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a signature authentication device as a pattern matching device according to the present invention. In FIG. 1, reference numeral 1 denotes an arithmetic control circuit for controlling the entire apparatus and communicating data used for signature authentication to a host computer 10 through a serial cable or the like. Reference numeral 3 denotes a vibration input pen used by a signer (hereinafter, a user).
Reference numeral 2 denotes a pen code for transmitting various signals from the arithmetic control circuit 1 to the vibration input pen 3. Reference numeral 8 denotes a vibration transmission plate, which is made of a transparent member such as acrylic or glass. This vibration transmission plate 8
An anti-scattering film (laminate) is provided on the upper surface of the vibration transmission plate 8 with an adhesive layer interposed therebetween.

The user makes a sign by moving the vibration input pen 3 while making contact with the vibration transmission plate 8.
Actually, the user designates the inside of the area (hereinafter referred to as the effective area) indicated by A in FIG.
A vibration isolator 7 is provided on the outer periphery of the vibration transmission plate 8 to prevent (reduce) the reflected vibration from returning to the central portion. Are fixed.

Reference numeral 9 denotes a signal waveform detection circuit for detecting the waveform of the vibration detected by each of the vibration sensors 6a to 6d, and sends the detection signal to the arithmetic and control circuit 1. Reference numeral 11 denotes a display device, such as a liquid crystal display, capable of displaying in units of dots, and is arranged behind the vibration transmission plate 8. In accordance with an image signal from the host computer 10, dots are displayed along the movement locus of the vibration input pen 3, and the dots can be viewed through the vibration transmission plate 8.

FIG. 2 shows the configuration of the vibration input pen 3. FIG.
, The pen internal circuit 4 built in the vibration input pen 3
Includes a vibrator drive circuit 4-1 and a vibrator 4-2. A drive signal of the vibrator 4-2 is supplied as a low-level pulse signal from the arithmetic and control circuit 1, and is supplied to the vibrator drive circuit 4-1. After being amplified to a predetermined gain, it is applied to the vibrator 4-2. The electric drive signal is converted into mechanical ultrasonic vibration by the vibrator 4-2, and transmitted to the vibration transmission plate 8 via the pen tip 5. The vibrator drive circuit 4-1 may be built in the vibration input pen 3 as shown in the figure, or may be mounted on a control board of the main body.

Here, the vibration frequency of the vibrator 4-2 is selected so as to generate a plate wave on the vibration transmission plate 8 made of glass or the like. Further, the vibration input pen 3 is not limited to the above-described plate wave. For example, when a surface wave propagating through the vibration transmission plate 8 is used as a detection wave, the vibration input pen 3 may be used.
Is set to a value that is sufficiently large with respect to the thickness of the vibration transmission plate 8, that is, a state in which the wavelength λ of the wave propagating through the vibration transmission plate 8 is sufficiently small with respect to the thickness of the plate. do it.

The arithmetic and control circuit 1 outputs a signal for causing the vibrator 4-2 to vibrate at a predetermined cycle (for example, 10 ms) to the vibrator drive circuit 4-1 and measures the time by an internal counter. Thus, the vibration generated in the vibration input pen 3 reaches the vibration sensors 6a to 6d with a delay corresponding to the distance to each sensor.

The signal waveform detection circuit 9 is provided for each of the vibration sensors 6a
6d is generated, and a signal indicating the timing of arrival of vibration at each sensor is generated by a waveform detection process described later. The arithmetic and control circuit 1 receives this signal, detects a vibration arrival time to each sensor, calculates the position coordinates of the vibration input pen 3 based on this detection, and
Output to

FIG. 3 shows the configuration of the arithmetic control circuit 1. FIG.
In the figure, reference numeral 31 denotes a microcomputer (hereinafter referred to as a microcomputer) for controlling the arithmetic control circuit 1 and the entire apparatus shown in FIG. 1; an internal counter, a ROM for storing operation procedures, a RAM for use in calculations, and a nonvolatile memory for storing constants and the like. Etc. 32a to 32d are counters for counting reference clocks, and the vibrator 4-2 is connected to the vibrator drive circuit 4-1.
The above timing is started by the input of the drive start signal.
This synchronizes the start of time measurement with the detection of vibration by the vibration sensors 6a to 6d, so that the delay time until vibration is detected by each sensor can be measured.

The vibration arrival timing signals from the vibration sensors 6a to 6d output from the signal waveform detection circuit 9 are transmitted to the respective counters 32a to 32d via the detection signal input circuit 34.
Is input to When the determination circuit 33 determines that all the detection signals have been received in this way, the microcomputer 3
Tell 1 to that effect. The microcomputer 31 reads the arrival time of each of the vibration sensors 6a to 6d measured by each of the counters 32a to 32d into the latch circuit in accordance with the above determination, and performs a predetermined calculation to thereby calculate the vibration on the vibration transmission plate 8. The position coordinates of the input pen 3 are calculated.

The position coordinates are output to the host computer 10 via the I / O port 35. The host computer 10 displays a dot on the display device 11 at a position corresponding to the input position coordinates.

Next, the principle of measuring the vibration arrival time will be described. FIG. 4 shows the configuration of the signal waveform detection circuit 9, and FIG. 5 is a timing chart for explaining the measurement processing. In the following description, the case of the vibration sensor 6a will be described, but the same applies to the other vibration sensors 6b to 6d. The measurement of the vibration arrival time to the vibration sensor 6a starts simultaneously with the input of the start signal to the vibrator drive circuit 4-1. At this time, the vibrator driving circuit 4-1 sends the vibrator 4
The drive signal 51 of FIG. 5 is added to -2. This drive signal 51 is two short rectangular pulses.

The ultrasonic vibration transmitted from the vibration input pen 3 to the vibration transmission plate 8 by the drive signal 51 proceeds over a time corresponding to the distance to the vibration sensor 6a, and then forms a short detection waveform as the vibration sensor 6a. Is detected by 5 in FIG.
Reference numeral 2 denotes a signal waveform detected and obtained from the preamplifier 401 of FIG. The reason why the drive signal 51 is set to a short pulse is that erroneous detection due to interference (superposition) between the unnecessary reflection component mainly at the end face of the vibration transmission plate 8 and the vibration to be detected is prevented, and the size of the entire apparatus is reduced. This is for planning.

The above signal waveform 5 detected by the vibration sensor 6a
2 is composed of a group signal indicated by 521 and a phase signal indicated by 522, and each is processed as follows.
First, the group signal 521 is easily affected by the reflected wave.
After removing unnecessary vibrations through the high-pass filter 402, the envelope detection circuit 403 outputs an envelope signal 5.
3 is taken out. The envelope signal 53 is attenuated to an appropriate amplitude by the gate signal generation circuit 406 and then added with a certain offset to the reference level signal 541.
Is generated.

The gate signal generation circuit 406 also receives the second-order differential waveform 54 from the envelope inflection point detection circuit 404, and compares it with the reference level signal 541 to output a gate generation signal 542. The monostable multivibrator 407 receives the gate generation signal 542
Gate signal 55 having a predetermined pulse width from the rising timing of
11 is output. The tg comparator 405 receives the gate signal 55 and the second-order differential waveform 54 and inputs the gate signal 55
The tg signal is generated with the zero crossing point during the opening of the as an inflection point of the envelope. This tg signal is supplied to the arithmetic and control circuit 1.

On the other hand, the phase signal 522 is converted into a signal having a predetermined bandwidth by a narrow-band bandpass filter 409, and a slice circuit 410 slices the waveform to a predetermined amplitude level or less (waveform level compression). The outputs of the phase signal 58 and the gate signal 55 are input to the tp comparator 411. The tp comparator 411 outputs the phase signal (slice circuit 4) while the gate signal 55 is open.
The zero-crossing point at the rising edge of the output signal 58) is detected, and the phase delay time signal tp is supplied to the arithmetic and control circuit 1. In FIG. 5, tp is the second rising zero-crossing point.

Here, the reference level signal 541 for outputting the gate signal 55 may be a variable level synchronized with the drive pulse 51 in accordance with the distance between the vibration input pen 3 and the vibration sensor 6a. If the fluctuation range of the detection level is large depending on the distance, the detection point can be stabilized by setting it to a variable level.

In this embodiment, since a plate wave is used, the relationship between the envelope signal 521 and the phase signal 522 of the detected waveform with respect to the transmission distance in the vibration transmission plate 8 is as follows.
It changes according to the transmission distance during vibration transmission. here,
The speed at which the envelope signal 521 advances, that is, the group speed is V
g, the speed at which the phase signal 522 advances, that is, the phase speed is Vp. The distance d between the vibration input pen 3 and the vibration sensor 6a can be detected from the group velocity Vg and the phase velocity Vp.

First, focusing only on the envelope signal 521, if a point on a specific waveform (for example, an inflection point) is detected, and its vibration transmission time is tg, d = Vg · tg─── (1 ).

Further, the above d is obtained based on the detection of the phase signal 522 in order to determine coordinates with higher accuracy.
Assuming that the vibration transmission time is tp, d = n · λp + Vp · tp─── (2) Here, λp is the wavelength of the elastic wave, and n is an integer.
The above integer n is obtained by the following equation from the equations (1) and (2). n = int {(Vg.tg-Vp.tp) / [lambda] p + 1/2} (3)

As described above, since the plate wave is used as the detection wave, it cannot be said that the linearity of the group delay time tg with respect to the distance is good, and the integralization is performed in the equation (3). Is for this. The necessary and sufficient conditions for obtaining an accurate integer n are shown in Expression (5) derived from Expression (4) below. n ^* = (Vg · tg−Vp · tp) / λp─── (4) ΔN = n ^* −n ≦ 0.5─── (5)

That is, if the generated error amount is within ± 1/2 wavelength, even if the linearity of the group delay time tg is not good,
This shows that the integer n can be accurately determined. The distance d between the vibration input pen 3 and the vibration sensor 6a can be accurately measured by substituting n obtained as described above into the equation (2). Although the configuration and operation described above relate to the vibration sensor 6a, the other vibration sensors 6b to 6d have the same configuration and operation.

Next, the calculation of the position coordinates of the vibration input pen 3 on the vibration transmission plate 8 will be described with reference to FIG. In FIG. 8, when three vibration sensors 6a to 6d are provided at positions indicated by Sa to Sd near the vertexes of the four sides on the vibration transmission plate 8, the position P of the vibration input pen 3 is determined based on the principle described above. Linear distances da to d from the position to the position of each vibration sensor 6a to 6d
d can be determined.

Further, the arithmetic control circuit 1 calculates the linear distance d
The coordinates (x, y) of the position P of the vibration input pen 3 can be obtained by the following equation from the square theorem based on a to dd. x = (da + dd) · (da−dd) / 2X─── (6) y = (da + dd) · (da−dd) / 2Y─── (7) where X and Y are the vibration sensors 6a to 6a, respectively. 6d. As described above, the position coordinates of the vibration input pen 3 can be detected in real time.

In the above calculation, the calculation is performed using the distance information to three sensors. In the present embodiment, four sensors are installed, and the distance information of the remaining one sensor is used. Used to verify the accuracy of output coordinates.
Of course, the remaining three sensors are used without using, for example, the distance information of the sensor having the largest pen-sensor distance L (the detection signal level decreases because L increases, and the probability of being affected by noise increases). May be used to calculate the coordinates.

In the above embodiment, four sensors are arranged and coordinates are calculated by three sensors. However, geometrically, coordinates can be calculated by two or more sensors. The number of sensors is set according to the product specifications.

Next, detection of the pen pressure (the contact pressure of the vibration input pen 3 with the vibration transmission plate 8) will be described. The writing pressure detection is performed using the envelope signal 53. The envelope signal 53 is output from the envelope inflection point detection circuit 40.
4, input to the gate signal generation circuit 406 and the level adjustment circuit 412 for detecting level information. Level adjustment circuit 4
12 is the A / D converter 4 even if the maximum signal is input.
The level is adjusted at an amplification factor level set so as not to exceed the input voltage width of N.14. The level-adjusted signal is input to the peak hold circuit 413 to hold the peak level, and then input to the A / D converter.

The arithmetic control circuit 1 monitors the tg detection signal, and starts taking in the A / D converter 414 with a certain delay from the detection timing of the tg. The time constant of the peak hold circuit 413 is set to attenuate below the minimum detection level by the next detection. The signal level obtained by this sampling is A /
It is D-converted and input to the arithmetic and control circuit 1. The same operation as above is performed for other sensors, and the distance from the pen to each sensor and the signal level are detected.

On the other hand, the detection level signal detected at the same time includes attenuation due to the influence of the distance. If this signal is output as a pen pressure signal as it is, the value differs even at the same pen pressure depending on the distance from the sensor to the pen. Would. Therefore, the attenuation due to the distance is corrected based on the distance from each of the sensors da to dd to the pen.

The relationship between the distance and the detection level under input conditions with different distances, pen pressures and angles can be obtained by approximating an attenuation curve representing attenuation with respect to the distance by an exponential equation: V ′: detection level (including distance), V: Level information, d: It was found that the distance can be approximated by an approximate curve of V ′ = V · d ^−2/3 ─── (8).

By dividing the detection level signal obtained using the above relational expression by the calculated distance d (ad) ^−2/3 , it is possible to obtain level information that is not affected by distance. A curve optimized by the system may be used as the approximation curve used for correcting the attenuation due to the distance.

If it is difficult to perform the above calculation in actual real-time processing, a table of distances and values of −2/3 is prepared in advance, and the detection level signal voltage obtained from the table is obtained. To obtain the level information by multiplying by is an effective means for practical use. It is also an effective means to have several points of data of the attenuation curve and to linearly interpolate the data during use. The level information obtained as described above includes the pen pressure information and the information of the attenuation due to the inclination.

Next, the wavelength detection error (integral error) ΔN will be described. As described above, in the present embodiment, the plate wave is used as the detection wave, and the group delay time tg related to the group velocity Vg and the phase delay time tp related to the phase velocity Vp are measured, so that the vibration source and each sensor can be measured. The basic principle is to first calculate the distance. Then, Expressions (1) to (3) are used as the distance calculation expressions, and Expression (5) is shown as a necessary condition when using them.

The integer error ΔN (allowable value 0.5) is
In addition to the occurrence of the slope of the input pin, the group delay time t
It also occurs due to the non-linearity of distance g or the orientation of the input pen tip with respect to the sensor. As shown in FIG. 7, the integer error ΔN has a characteristic as shown in the figure (based on the integer error ΔN at an input angle of 90 °) depending on the input angle with respect to the distance between the vibration input pen and the sensor. are doing.

Next, authentication of a registered pattern and an input pattern will be described with reference to FIG. FIG. 6 shows the processing of the signature authentication method. In step 601, a screen for requesting input of a signature is displayed. In step 602, a signature is input using the input device using the vibration input pen 3 and the vibration transmission plate 8.
When the input is confirmed, data registered in advance is read. This registration data is obtained by signing in advance by the person himself, and taking in the coordinate values of the signature pattern, pen pressure information and ΔN information as time-series data. Registered after conversion to sampling number.

When the input is confirmed in step 602, in step 603, data registered in advance is called from the data area of the host computer 10. Step 60
In step 4, a process is performed to match the sampling numbers in order to equalize the data numbers of the input data and the registered data. In step 605, a process of converting the absolute coordinate value of the data input in step 602 into coordinates relative to the start point of the registered data is performed. The processing so far is processing for generating comparison data as a preparation stage for comparing registered data with input data.

Next, it is sequentially determined whether each parameter of the coordinate value, the writing pressure information, and the ΔN information is true or false. First, in step 606, the relative coordinates are compared using the converted data, and in step 607, the following operation is performed after outputting the result of the true / false determination. If the result of the determination is true, that is, if the person is recognized, the process proceeds to step 609. If the result of the determination is false, that is, if the person is not recognized, then step 6
An error message that denies access in 08 is displayed on the screen.

In step 607, if true, step 6
At step 09, the pen pressure information is compared. At step 610, if true according to the determination result, an error message is displayed at step 611, and if false, an error message is displayed at step 608. In step 611, the ΔN information is compared with each other.
At 12, a determination is made. If true, a signal to the effect that the user has been recognized is output in step 613. If false,
At step 608, an error message is displayed. In the host computer 10, when the input person is confirmed to be the person himself / herself, various operations can be continued.

Here, steps 607, 610, 612
Are determined by threshold processing of a predetermined width for each of the relative coordinate value, the pen pressure information, and the ΔN information. This threshold can be changed by the administrator of the authentication system depending on the application in which the system is provided.
As described above, highly reliable signature authentication can be realized.

In the above-described embodiment, thresholds of a predetermined width are provided for the relative coordinates, the pen pressure information, and the ΔN information, respectively, and the determination is sequentially performed. It may be treated as data and determined collectively. In the above-described embodiment, each step of signature authentication is executed by the host computer. However, the authentication may be performed by the pen input device and only the execution result may be output to the host computer.

Further, when the group velocity Vg or the phase velocity Vp, which is a constant, is changed, the integer error ΔN becomes ΔN
Also change. Therefore, for example, a system administrator periodically changes the above constants, so that the security of registered data against hacking from the outside can be improved. When the constant is changed, it is necessary to correct the registered data according to the changed value.

Further, if a switch signal for changing the constant is provided on the input pen side so that the input person can arbitrarily change the constant, it becomes difficult for the input pen to be authenticated by anyone other than the input pen. It is valid.

Next, a storage medium according to the present invention will be described. The system according to each functional block in FIG.
It may be configured as hardware, or may be configured as a computer system including a CPU, a memory, and the like. When configured in a computer system, the memory forms a storage medium according to the present invention. In this storage medium, a program for executing the processing procedure for controlling the above-described operation including the flowchart of FIG. 6 is stored.

As the storage medium, ROM, R
Semiconductor memory such as AM, optical disk, magneto-optical disk,
These may be formed into a CD-ROM, a floppy disk, a magnetic card, a nonvolatile memory card, or the like using a magnetic medium or the like.

Therefore, this storage medium can be used in a system or apparatus other than the system shown in FIG. 1 and the system or computer can read out and execute the program code stored in this storage medium to execute the above-described embodiment. A function equivalent to that of the embodiment can be realized, and an equivalent effect can be obtained, thereby achieving the object of the present invention.

An OS running on a computer
When performing part or all of the processing, or after the program code read from the storage medium is written to the memory provided in the extended function board or the extended function unit connected to the computer,
Even when the CPU or the like provided in the above-mentioned extended function board or extended function unit performs part or all of the processing based on the instructions of the program code, the same functions as those of the embodiment can be realized and the same effects can be obtained. And achieve the object of the present invention.

[0054]

As described above, according to the present invention,
By drawing the movement trajectory while contacting the vibration input means on the vibration transmission plate, and comparing the drawn pattern, its contact pressure, wavelength detection error information, etc. with those registered in advance, each comparison The input information can be determined with high accuracy based on the result. In particular, by using the present invention for signature authentication, it is possible to determine with high accuracy whether or not the signer is the person himself, and to achieve highly reliable signature authentication.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a pattern matching device according to the present invention.

FIG. 2 is a configuration diagram of a vibration input pen.

FIG. 3 is a block diagram illustrating a configuration of an arithmetic control circuit.

FIG. 4 is a block diagram illustrating a configuration of a signal waveform detection circuit.

FIG. 5 is a timing chart showing a detection waveform supplied to a signal waveform detection circuit and a process of measuring a vibration transmission time based on the detection waveform.

FIG. 6 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a relationship between a distance between an input pen and a sensor and an integer error.

FIG. 8 is a configuration diagram illustrating an example of position coordinate calculation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation control circuit 3 Vibration input pen 6a-6b Vibration sensor 8 Vibration transmission board 9 Signal waveform detection circuit 10 Host computer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryozo Yanagisawa, 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Katsuyuki Kobayashi 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Yuichiro Yoshimura 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term (reference) 5B043 AA09 BA06 DA07 GA02 GA05 5B047 AA27 BC30 5B068 BB21 BC02 BD02 BD11 CC19

Claims (12)

[Claims] 1. A vibration transmission plate for transmitting vibration, vibration input means for inputting vibration to the vibration transmission plate while being in contact with and moving on the vibration transmission plate, and transmission from the vibration input means through the vibration transmission plate. Vibration detecting means for detecting the vibration to be applied, position calculating means for calculating the position of the vibration input means on the vibration transmission plate based on the vibration detected by the vibration detecting means, and vibration detected by the vibration detecting means Contact pressure detecting means for detecting the contact pressure of the moving vibration input means based on the following: error detecting means for detecting a wavelength detection error of the vibration detecting means; and the position calculating means with the movement of the vibration input means A first comparing means for comparing the movement trajectory of the position calculated by the above with a predetermined pattern, and a second comparing means for comparing the contact pressure information detected by the contact pressure detecting means with the predetermined contact pressure information. When pattern matching apparatus characterized in that a third comparison means for comparing the wavelength detection error information with a predetermined wavelength detection error information the error detecting means has detected. 2. A method according to claim 1, further comprising determining means for determining whether the information input from said vibration input means to said vibration transmission plate is true or false based on a comparison result of said first to third comparing means. The pattern matching device according to claim 1. 3. The pattern matching device according to claim 1, wherein the vibration transmitted to the vibration transmission plate is a plate wave. 4. The apparatus according to claim 1, wherein said vibration detecting means has a plurality of vibration sensors, and said position calculating means calculates said position based on a time until vibration reaches each vibration sensor. 2. The pattern matching device according to 1. 5. A vibration detecting step for detecting vibration transmitted from said vibration transmitting means through vibration input means for inputting vibration to said vibration transmitting plate while moving on said vibration transmitting plate, and said vibration detecting procedure. Calculating a position of the vibration input means on the vibration transmission plate based on the vibration detected by the method; and detecting a contact pressure of the moving vibration input means based on the vibration detected by the vibration detection procedure. A contact pressure detection procedure, an error detection procedure for detecting a wavelength detection error in the vibration detection procedure, and a movement pattern of the position calculated by the position calculation procedure with movement of the vibration input means and a predetermined pattern. A first comparing step, a second comparing means for comparing the contact pressure information detected by the contact pressure detecting step with predetermined contact pressure information, and a wavelength detecting error information detected by the error detecting step. A third comparing step of comparing predetermined wavelength detection error information with predetermined wavelength detection error information. 6. A judging procedure for judging the authenticity of information inputted from said vibration input means to said vibration transmission plate based on a comparison result of said first to third comparison procedures is provided. The pattern matching method according to claim 5. 7. The pattern matching method according to claim 5, wherein the vibration transmitted to the vibration transmission plate is a plate wave. 8. The vibration detecting step includes detecting using a plurality of vibration sensors, and the position calculating step calculates the position based on a time until the vibration reaches each of the vibration sensors. The pattern matching method according to claim 5, wherein 9. A vibration detecting process for detecting a vibration transmitted through said vibration transmitting plate from vibration input means for inputting vibration to said vibration transmitting plate while moving on said vibration transmitting plate, and said vibration detecting vibration. Calculating a position of the vibration input means on the vibration transmission plate based on the vibration detected by the control unit; and detecting a contact pressure of the moving vibration input means based on the vibration detected by the vibration detection processing. A contact pressure detection process, an error detection process for detecting a wavelength detection error in the vibration detection procedure, and comparing a movement locus of the position calculated by the position calculation process with the movement of the vibration input means and a predetermined pattern. A first comparison process, a second comparison process of comparing the contact pressure information detected by the contact pressure detection process with predetermined contact pressure information, and a wavelength detection error information detected by the error detection process. A computer-readable storage medium storing a program for executing a third comparison process for comparing with predetermined wavelength detection error information. 10. The program according to claim 1, further comprising a determination process for determining whether the information input to the vibration transmission plate from the vibration input means is true or false based on a comparison result of the first to third comparison processes. The computer-readable storage medium according to claim 9, wherein the storage medium is a computer-readable storage medium. 11. The computer-readable storage medium according to claim 9, wherein the vibration transmitted to the vibration transmission plate is a plate wave. 12. The vibration detection processing detects using a plurality of vibration sensors, and the position calculation processing calculates the position based on a time until the vibration reaches each vibration sensor. 10. The computer-readable storage medium according to claim 9.