JP7305170B2 - PEN INPUT PERSONAL AUTHENTICATION METHOD, PROGRAM FOR EXERCISEING PEN INPUT PERSONAL AUTHENTICATION METHOD ON COMPUTER, AND COMPUTER-READABLE STORAGE MEDIUM - Google Patents

Description

The present invention relates to a pen-input personal authentication method. More specifically, the present invention relates to a method of authenticating whether or not a person is the person himself/herself based on handwriting information input by an electronic pen on a plane and near the upper side of the plane.

It has been a long time since demand for personal identification technology became a global trend in the field of security. Personal identification methods include (1) personal memorization such as passwords and PINs, (2) personal possessions such as credit cards, and (3) static personal characteristics such as fingerprints and veins. , and (4) by personal dynamic artifacts such as signatures and voiceprints (see Table 1). Among these methods, (3) and (4) are called biometrics methods. As conventional methods, the above (1) and (2) are often used.

As a personal authentication method based on the biometrics system, for example, there is a pen-input personal authentication method disclosed in Patent Document 1. This system recognizes handwriting information when signing on a tablet with an electronic pen as (1) positional handwriting information of the tip of the pen on the tablet plane, and (2) writing pressure handwriting information, and compresses these information as necessary. After that, using an evaluation function created for this purpose, a predetermined distance is calculated from the template of the person prepared in advance. It authenticates whether or not the person who has done so is the person himself/herself. As a result, not only the handwriting as a visible two-dimensional image, but also the passage of time and the passage of time of writing pressure are used, making it extremely difficult for a third party to imitate the signature. are doing.

Patent No. 4307606

Personal identification methods that rely on possessions and stored information are not necessarily perfect in recent years, with the increase in computer crimes such as theft, theft, and counterfeiting by unauthorized third parties. The biometrics method is expected as a substitute or alternative. There is a demand for a biometrics-based personal authentication method that is relatively easy for the person to be identified and that can perform personal authentication at low cost.

Among the biometrics methods, some of the biometric characteristics of individuals, such as fingerprints and retinas, have the advantage of being immutable throughout life, but on the other hand, if a third party steals the data with those characteristics, there is no way for the person to respond. , there is a drawback. On the other hand, if it turns out that the signature data has been stolen, it can be dealt with by changing the signature by the person himself/herself.

False Rejection Rate (FRR) and False Acceptance Rate (FAR) are often used as evaluation indexes of authentication technology, and authentication technology with low both of them is required. However, when configuring the authentication system, there is a contradictory relationship in which setting the FRR to be low increases the FAR, or conversely, setting the FAR to be low increases the FRR. Therefore, there is a demand for a signature authentication technique that simultaneously minimizes these conflicting evaluation indices.

Accordingly, the present invention provides a pen-input personal authentication method with lower false acceptance rate (FAR) and false rejection rate (FRR).

A pen-input personal authentication method according to an aspect of the present invention is a pen-input personal authentication method for authenticating whether or not a person is an individual based on handwriting drawn by a tip of a pen on a plane of an input device and near the upper part of the input device, the method comprising: A start button and an end button are provided in advance on the plane, and after the start button is pressed by the tip of the pen within a range where the input device can detect the coordinate information of the tip of the pen , the end button is pressed. Coordinate information of the tip of the pen on the plane and the vicinity above it and writing pressure information (writing pressure information is a specific value when the pen tip is not on the plane) until it is pressed down is time -series a step of obtaining handwriting information of a signature by successively importing the signature into a third party, a step of extracting a feature amount of the signature from the handwriting information, and a step of inputting the feature amount to a discriminator for discriminating whether or not the handwriting is the signature of the person himself/herself. and identifying whether the handwriting is a signature of the person.

According to this aspect, personal authentication with a lower false acceptance rate (FAR) and false rejection rate (FRR) can be performed based on handwriting information on the plane of the input device and in the vicinity above it.

In the above aspect, the step of obtaining the handwriting information includes chronologically displaying the coordinates of the pen tip from when the pen tip depresses the start button and when the pen tip leaves the plane until it touches the plane again. obtaining first latent handwriting information ; and, subsequent to said first latent handwriting information, time-sequentially retrieving coordinates of said pen tip on said plane and writing pressure information to obtain unique signature handwriting information. and, subsequent to the unique signature handwriting information, taking in the coordinates of the pen tip in time series from when the pen tip leaves the plane to when the end button is pressed , obtaining handwriting information ; and

According to this aspect, in addition to the original signature handwriting information of the signer, the hidden handwriting information can be taken into consideration when carrying out personal authentication, thereby enabling more accurate authentication. By not displaying the hidden handwriting information on the screen and setting the hidden handwriting information at will, the risk of the handwriting being read by others is further reduced, and safer authentication is possible. Further, when the signature is changed, it is possible to change the hidden handwriting information without changing the original signature handwriting information of the signer.

In the above aspect, the step of extracting the feature amount may include extracting the feature amount of the extended signature handwriting information that is a combination of the first hidden handwriting information , the second hidden handwriting information , and the unique signature handwriting information .

A pen-input personal authentication method according to an aspect of the present invention is a pen-input personal authentication method for authenticating whether or not a person is a person based on handwriting drawn by a tip of a pen in the upper vicinity of a plane of an input device, the input device comprising: is within the range in which the coordinate information of the pen tip can be detected, the pen tip touches a predetermined start point on the plane until a predetermined end point on the plane is touched by the pen tip. obtaining aerial signature handwriting information that the pen tip draws in the vicinity of the upper part of the plane without contacting the plane; extracting a feature amount of a signature from the aerial signature handwriting information; inputting to a discriminator for discriminating whether or not the handwriting is the signature of the person to identify whether or not the handwriting is the signature of the person.

According to this aspect, by touching the start point and end point on the plane of the input device, the aerial signature handwriting information can be obtained, so that nothing can be displayed on the plane, and the handwriting can be read by others. The risk is further reduced, and safer authentication is possible. Further, when the signature is changed, it can be handled by changing the aerial signature handwriting information.

A program according to another aspect of the present invention causes a computer to execute the pen-input personal authentication method of the above aspect.

A computer-readable storage medium according to another aspect of the present invention stores the program of the above aspect.

According to the present invention, it is possible to provide a pen-input personal authentication method with lower false acceptance rate (FAR) and false rejection rate (FRR).

FIG. 4 is a diagram showing examples of a start button, an end button, concealed handwriting , and unique signature handwriting in the pen-input personal authentication method according to the embodiment of the present invention; FIG. 10 is a diagram showing another example of concealed handwriting in the pen-input personal authentication method according to the present embodiment; FIG. 10 is a diagram showing another example of a start button, an end button, and concealed handwriting in the pen-input personal authentication method according to the present embodiment; FIG. 10 is a diagram showing start coordinates of a first concealed handwriting , end coordinates of a second concealed handwriting , and start and end coordinates of a unique signature handwriting in the pen-input personal authentication method according to the present embodiment; FIG. 4 is a diagram showing an example of an aerial signature handwriting in the pen-input personal authentication method according to the present embodiment; FIG. 10 is a flowchart of a personal authentication algorithm when using an extended signature handwriting in the pen-input personal authentication method according to the present embodiment; FIG. FIG. 10 is a flowchart of a personal authentication algorithm when using an aerial signature handwriting in the pen-input personal authentication method according to the present embodiment; FIG.

Embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in each figure, the same reference numerals have the same or similar configurations.

FIG. 1 is a diagram showing examples of a start button 101, an end button 105, hidden handwritings 103 and 106, and a unique signature handwriting 102 in a pen-input personal authentication method according to an embodiment of the present invention. A unique signature handwriting 102 includes a start point 102a and an end point 102b.

The pen-input personal authentication method according to the present embodiment may be implemented by using a commercially available pen tablet as an input device and processing handwriting information acquired by the pen tablet by a computer. The pen tablet measures the coordinates of the tip of the pen and writing pressure information in chronological order and outputs them to the computer. In the pen input personal authentication method according to the present embodiment, there is no particular limitation as long as the position information of the pen tip on the tablet and near the upper part of the tablet and P (P is a positive integer value). If not, the writing pressure information is set to 1. A combination of an electronic pen and a tablet capable of classifying the writing pressure into the steps of (1 ) and detecting the writing pressure is used.

In this specification, the handwriting information is information obtained by chronologically capturing the pen tip coordinates and writing pressure information on and near the plane of the input device. The handwriting information includes not only the coordinates and writing pressure information acquired when the pen tip is in contact with the plane, but also the coordinates when the pen tip leaves the plane and moves above the plane.

The pen-input personal authentication method according to the present embodiment is generally performed by using a computer including a personal computer and connecting a tablet to it. may be used for In that case, it is preferable to be able to detect the pen position near the top of the plane. Also, a smartphone equipped with a pen input function can be used as long as the pen position near the top of the plane can be detected.

In the pen-input personal authentication method according to the present embodiment, the input device is provided with a start button 101, which is an area where the signer should press the pen when starting to sign, and an area where the pen should be pressed when finishing the signature. is provided in advance . The size and positioning of these button areas is arbitrary, but should consider both signer usability and authentication accuracy. In the case of FIG. 1, the start button 101 and the end button 105 are arranged side by side at the bottom center of the screen.

The signer presses a preset start button 101 with the tip of the pen before starting to sign on the plane of the signer's original input device ( referred to as "unique signature handwriting "). up to the starting point 102a of , with handwriting (first hidden handwriting 103) near the upper part away from the tablet screen. For example, a first hidden handwriting 103 indicated by a dashed line is considered. In addition, from the end point 102b of the unique signature handwriting 102 to the preset end button 105, the handwriting (second hidden handwriting 106) near the upper part away from the signature screen is written. For example, a second underlying handwriting 106 shown in dashed lines is considered. These hidden handwritings 103, 106 can be designed at will by the signer. Since the hidden handwritings 103 and 106 are not displayed on the tablet screen, spoofing is extremely difficult.

The combination of the hidden signature handwriting 103, 106 and the unique signature handwriting 102 is referred to herein as the "extended signature handwriting ." It should be noted that the signer's original signature, ie, the unique signature handwriting 102, typically includes both the tablet plane and its upper vicinity.

FIG. 2 is a diagram showing another example of concealed handwriting in the pen-input personal authentication method according to the present embodiment. The first hidden handwriting 103b of this example is a different handwriting from the example shown in FIG. Also, the second hidden handwriting 106b of this example is a different handwriting from the example shown in FIG. In this way, the signer can arbitrarily design hidden handwriting 103b, 106b to make spoofing difficult.

FIG. 3 is a diagram showing another example of the start button 101b, the end button 105b, and hidden handwritings 103c and 106c in the pen-input personal authentication method according to this embodiment. A start button 101b and an end button 105b in this example are arranged side by side in the upper center of the screen. With such a layout change, the first hidden handwriting 103c is a different handwriting from the example shown in FIG. Also, the second hidden handwriting 106c of this example is a different handwriting from the example shown in FIG. By designing the arrangement of the start button 101b and the end button 105b in this manner, the hidden handwritings 103c and 106c can be changed to make spoofing more difficult.

FIG. 4 shows the start coordinates ( _xB , _yB ) of the first hidden handwriting 103, the end coordinates ( _xE , _yE ) of the second hidden handwriting 106, the unique FIG. 4 is a diagram showing start coordinates (x _begin , y _begin ) and end coordinates (x _end , y _end ) of signature handwriting 102; Here, although the areas of the start button 101 and the end button 105 are spread out, the start coordinates (x _B , y _B ) of the first hidden handwriting 103 and the end coordinates (x _E , y B ) of the second hidden handwriting 106 y _E ) are each single position coordinates.

FIG. 5 is a diagram showing an example of the aerial signature handwriting 111 in the pen-input personal authentication method according to this embodiment. In this example, the signer touches the starting point 110 with the tip of the pen, then draws a mid-air signature handwriting 111, and finally touches the ending point 112 to complete the signature. In this case, all the handwritings other than the start point 110 and the end point 112 are drawn in the air (in the vicinity above the plane of the input device).

FIG. 6 is a flowchart of a personal authentication algorithm when using an extended signature handwriting in the pen-input personal authentication method according to the present embodiment. Handwriting information, which is data that can be processed by a computer, is obtained by inputting handwriting into an input device. An extended signature handwriting information input 401 obtained by signing a tablet, which is an input device, and an extended template signature handwriting information 402 prepared in advance are input. First, the first latent handwriting information is collected (403), the unique handwriting information is collected (404), and the second latent handwriting information is collected (405). Then, the extended signature handwriting information is obtained (406).

After that, pre-designed feature extraction (407) is performed from the extended signature handwriting information , the feature amount is input to the discriminator (408), and the final result output is obtained from the discriminator (409). Here, the result output is the result of personal authentication.

Here, the feature extractor and discriminator use signature handwriting information , and are arbitrary as long as they have a predetermined performance. For example, the technology described in Patent Document 1 can be used.

FIG. 7 is a flowchart of a personal authentication algorithm when using an aerial signature handwriting in the pen-input personal authentication method according to the present embodiment. An input aerial signature handwriting information input 501 obtained by signing a tablet as an input device and template aerial signature handwriting information 502 prepared in advance are input. First, the tablet collects aerial signature handwriting information (503).

After that, pre-designed feature extraction (504) is performed from the aerial signature handwriting information , the feature amount is input to the discriminator (505), and the final result output is obtained from the discriminator (506). Here, the result output is the result of personal authentication.

The pen-input personal authentication method of the present invention reads an execution program stored in a computer-readable storage medium, such as a ROM (Read Only Memory), a RAM (Random Access Memory), or a hard disk, and executes it. It can also be implemented on Furthermore, the pen-input personal authentication method of the present invention can also be provided in the form of a program incorporated in a computer or computer-controlled apparatus and electronic device. For example, it can be incorporated into automatic teller machines, entrance/exit management devices, and any other devices and electronic devices that require personal authentication.

The embodiments described above are for facilitating understanding of the present invention, and are not intended to limit and interpret the present invention. Each element included in the embodiment and its arrangement, materials, conditions, shape, size, etc. are not limited to those illustrated and can be changed as appropriate. Also, it is possible to partially replace or combine the configurations shown in different embodiments.

101... Start button, 102... Unique signature handwriting , 103... First concealed handwriting , 105... End button, 106... Second concealed handwriting , 110... Start point, 111... Aerial signature handwriting , 112... End point

Claims (6)

A pen-input personal authentication method for authenticating whether or not a person is a person based on handwriting drawn by the tip of the pen on the plane of an input device and in the vicinity thereof,
A start button and an end button are provided in advance on the plane,
on the plane of the tip of the pen and during the period from when the start button is pressed by the tip of the pen to when the end button is pressed within a range in which the input device can detect the coordinate information of the tip of the pen; a step of acquiring handwriting information of a signature by sequentially taking in coordinate information and writing pressure information in the upper vicinity thereof (writing pressure information is a specific value when the tip of the pen is not on the plane) in time series;
a step of extracting signature features from the handwriting information;
A step of inputting the feature amount to a discriminator for discriminating whether the handwriting is the signature of the person in question, and identifying whether the handwriting is the signature of the person in question;
Pen input personal authentication method including. The step of obtaining handwriting information includes:
obtaining first hidden handwriting information by taking in the coordinates of the pen tip in chronological order from when the pen tip depresses the start button and when the pen tip leaves the plane until it touches the plane again;
obtaining unique signature handwriting information by taking in time-series coordinates of the pen tip on the plane and writing pressure information following the first latent handwriting information;
Subsequent to the unique signature handwriting information, the step of obtaining second latent handwriting information by taking in the coordinates of the pen tip in time series from when the pen tip leaves the plane until when the end button is pressed. and,
The pen-input personal authentication method according to claim 1, comprising: The step of extracting the feature amount includes extracting the feature amount of extended signature handwriting information that is a combination of the first hidden handwriting information, the second hidden handwriting information, and the unique signature handwriting information,
3. The pen-input personal authentication method according to claim 2. A pen-input personal authentication method for authenticating whether a person is a person or not based on handwriting drawn near the upper part of the plane of an input device by the tip of the pen,
After the tip of the pen touches a predetermined start point on the plane until the tip of the pen touches a predetermined end point on the plane, the input device can detect the coordinate information of the tip of the pen. obtaining aerial signature handwriting information that the pen tip draws near above the plane without the pen tip contacting the plane ;
a step of extracting signature features from the aerial signature handwriting information;
A step of inputting the feature amount to a discriminator for discriminating whether the handwriting is the signature of the person in question, and identifying whether the handwriting is the signature of the person in question;
Pen input personal authentication method including . A program for causing a computer to execute the pen-input personal authentication method according to any one of claims 1 to 4. A computer-readable storage medium storing the program according to claim 5.

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