WO2017213337A1

WO2017213337A1 - Method for correcting wearing position of msp-based biometric recognition device

Info

Publication number: WO2017213337A1
Application number: PCT/KR2017/003395
Authority: WO
Inventors: 홍혁기; 정석원; 조영창; 최연식
Original assignee: 전자부품연구원
Priority date: 2016-06-10
Filing date: 2017-03-29
Publication date: 2017-12-14
Also published as: KR101757592B1

Abstract

Provided is a method for correcting the wearing position of an MSP-based biometric recognition device. A method for biometric recognition, according to an embodiment of the present invention, involves: irradiating light on the wrist of a user, and detecting diffused reflective light from the wrist using a detector array having a first size to detect a light detection pattern; irradiating light on the wrist of the user, and detecting diffused reflective light from the wrist using a detector array having a second size to detect a light detection pattern; and identifying the user by comparing the measured light detection pattern and the registered light detection pattern. As a result, personal identification is carried out by correcting the wearing position of the MSP-based biometric recognition device, thereby significantly reducing the possibility of misidentification.

Description

Wear position correction method of MSP-based biometric devices

The present invention relates to biometric technology, and more particularly, to an apparatus and method for identifying an individual using biometric information.

As a biometric technology using biometric information, the most widely used fingerprint recognition technology is presently used. Fingerprints identify individuals based on their uniqueness.

However, as you can see from the recent news that fingerprints were made on silicon and fake fingerprints were used, the fingerprint recognition has limitations.

This is why there is a need for a biometric technique using an improved biometric information that is not capable of unauthorized personal authentication.

Accordingly, MSP (Multispectral Skin Photomatrics) based biometric technology has been developed. To do this, a biometric device is worn on a wrist to obtain biometric information, and the biometric device is compared with registered biometric information.

However, the position of the biometric device is different every time it is worn, so the personal identification result is frequently wrong.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for performing personal identification by correcting the wearing position of the MSP-based biometric device.

Biometric recognition method according to an embodiment of the present invention for achieving the above object, the step of irradiating light to the wrist of the user; Detecting light diffused by the wrist with a detector array of a first size, and registering a light detection pattern; Irradiating light onto the wrist of the user; Detecting light diffused by the wrist with a detector array having a second size to measure a light detection pattern; Comparing the measured light detection pattern with the registered light detection pattern; And using the comparison result, identifying the user.

The first size may be larger than the second size.

The detector array of the first size may be detectors in the form of an X * Y matrix, and the detector array of the second size may be detectors in the form of an S * T matrix and may be X> S and Y> T.

The registered light detection pattern may be an X * Y pattern matrix in which light detection data are listed, and the measured light detection pattern may be an S * T pattern matrix in which light detection data is listed.

In addition, an interval between cell centers of the X * Y pattern matrix and the S * T pattern matrix may be an interval between detectors.

The comparing may include comparing the S * T pattern matrix and the X * Y pattern matrix while horizontally and vertically scanning the S * T pattern matrix in cell units from the X * Y pattern matrix.

In addition, in the comparing step, when it is determined that the S * T pattern matrix and the X * Y pattern matrix do not match, the S * T pattern matrix is horizontally and vertically in units of 1 / n cells from the X * Y pattern matrix. In scanning, the S * T pattern matrix and the X * Y pattern matrix may be compared.

The comparing may include performing a horizontal and vertical scan while increasing the n until it is determined that the S * T pattern matrix and the X * Y pattern matrix match.

In addition, in the comparing step, when n becomes k, it may be determined that the S * T pattern matrix and the X * Y pattern matrix do not match.

On the other hand, according to another embodiment of the present invention, the personal authentication system, irradiating the light to the wrist of the user, by detecting the diffused reflection of the wrist with a detector array of the first size, the light detection pattern to the server A biometric information registration device for registering; A biometric device for irradiating light onto the wrist of the user and detecting light diffused and reflected on the wrist by a detector array of a second size to measure a light detection pattern; And a server that compares the measured light detection pattern with the registered light detection pattern and identifies a user using the comparison result.

On the other hand, the biometric information registration device according to another embodiment of the present invention, the light source array for irradiating light to the wrist of the user; A detector array of a first size for detecting diffusely reflected light of the wrist; And a processor configured to generate, transmit, and register a light detection pattern to a server by using a detection result of the detector array of the first size, wherein the server irradiates light to the wrist of the user, and the second size. The detector array detects lights diffused on the wrist, receives the measured light detection pattern, compares the received light detection pattern with the registered light detection pattern, and uses the comparison result to identify the user.

On the other hand, according to another embodiment of the present invention, the biometric device includes a light source array for irradiating light to the wrist of the user; A detector array of a second size for detecting diffusely reflected light of the wrist; And a processor configured to measure and transmit a light detection pattern to a server by using a detection result of the detector array of the second size, wherein the server irradiates light to the wrist of the user and detects a detector of a first size. The array of light-diffuse reflections of the wrist are detected by the array, and the measured light detection pattern is registered, the received light detection pattern is compared with the registered light detection pattern, and the user is identified using the comparison result.

As described above, according to the embodiments of the present invention, since the personal identification is performed by correcting the wearing position of the MSP-based biometric device, the probability of misidentification can be drastically reduced.

1 to 4 are views provided to explain the concept of horizontal biometrics using a plurality of light sources,

5 to 7 are provided for explaining the concept of the pattern matrix,

8 and 9 are views provided to explain the wearing position correction method,

10 is a view provided in the description of the MPS-based personal authentication system according to an embodiment of the present invention, and

11 and 12 are detailed block diagrams of the biometric device shown in FIG. 10.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a view provided to explain the concept of biometrics applicable to an embodiment of the present invention.

As shown in FIG. 1, light emitting diode (LED) -arrays 220-1 and 220-2 are listed on the inside, and photo diode (PD)-arrays 230-1 and 230-on the outside. 2) is listed.

The LED-arrays 220-1 and 220-2 and the PD-arrays 230-1 and 230-2 are elements provided in the biometric device according to the embodiment of the present invention. The biometric device is attached to the skin of the human body, as shown in FIG. 2, the LEDs irradiate light onto the skin, and the PDs detect light that diffusely reflects off the skin. Specifically,

1) PD-1 detects the light irradiated by LED-1 and diffusely reflected the skin and the light irradiated by LED-2 and diffusely reflected the skin,

2) PD-2 also detects light irradiated by LED-1 to diffusely reflect the skin and light irradiated on LED-2 to diffusely reflect the skin.

The wavelength of the LED-array-1 220-1 and the wavelength of the LED-array-2 220-2 may be implemented differently. For example, the LEDs constituting the LED-array-1 220-1 may be implemented with red LEDs, and the LEDs constituting the LED-array-2 220-2 may be implemented with blue LEDs.

Furthermore, each of the LEDs constituting the LED-arrays 220-1 and 220-2 may be implemented with various wavelengths. For example, the LED-array-1 220-1 may be implemented as an IR-LED or a Red-LED. , Green-LED, Blue-LED can be repeatedly arranged, and this is also the case for the LED-array-2 (220-2). Such an implementation is illustrated in FIG. 3.

If the LED-arrays 220-1 and 220-2 are each composed of N LEDs, and the PD-arrays 230-1 and 230-2 are each composed of N PDs, the LEDs are divided into M branches. In combination, M light detection patterns can be obtained. One light detection pattern includes 2N light detection data. Using M light detection patterns is more accurate in biometric recognition than using one light detection pattern.

In biometrics, LED combinations can be configured in various ways. E.g,

1) Only the IR-LED and Red-LED are turned on to generate the first light detection pattern.

2) Only the IR-LED and Green-LED are turned on to create a second light detection pattern.

3) Only the IR-LED and Blue-LED are turned on to generate a third light detection pattern.

4) Only the Red-LED and Green-LED are turned on to generate the fourth light detection pattern.

...

M) It is possible to generate the Mth light detection pattern by turning on only the IR-LED, Red-LED and Green-LED.

As a result, as shown in FIG. 4, M * 2N photodetection data can be obtained, which corresponds to M photodetection patterns. One light detection pattern is composed of 2N light detection data.

On the other hand, since different skin conditions (wrinkle, skin thickness / density, dermal thickness / density, etc.) and tissue state (vascular position / shape, muscle position / shape) are different for each user, M light detection patterns are used for biometrics. Can be.

That is, a DB is stored by storing M light detection patterns for each individual, and biometrics can be used using the DB.

Meanwhile, the arrangement of the LED-array and the PD-array shown in FIG. 1 may be extended as shown in FIG. 5. In the case of FIG. 5, the PDs are arranged in the form of S * T matrix in the biometric device.

In this case, one light detection pattern may be expressed in a matrix form as shown in FIG. 6. For convenience of indication and notation, the light detection pattern expressed in matrix form in FIG. 6 is referred to as a pattern matrix.

The pattern matrix shown in FIG. 6 may be referred to as image information obtained by matching photodetection data according to an arrangement of PDs. Thus, the centers of the cells constituting the pattern matrix coincide with the centers of the corresponding PDs. In addition, the distance between the centers of cells constituting the pattern matrix coincides with the distance between corresponding PDs.

When M LEDs are combined into M branches to obtain M light detection patterns, M pattern matrices shown in FIG. 6 are also generated.

The generated M pattern matrices are compared with each of the M pattern matrices registered in the DB, and a personal identification procedure is performed based on the match.

In order to distinguish and display the pattern matrix generated through measurement in the biometric device and the pattern matrix registered in the DB, the former is referred to as the measurement pattern matrix and the latter as the registration pattern matrix.

The measurement pattern matrix is illustrated in FIG. 6, and the registration pattern matrix is illustrated in FIG. 7. As can be seen from FIGS. 6 and 7, the size of the registration pattern matrix is larger than the size of the measurement pattern matrix. That is, "X> S" and "Y> T".

Hereinafter, a process of comparing the measurement pattern matrix and the registration pattern matrix to determine whether they match will be described in detail with reference to FIGS. 8 and 9.

8 and 9 show a process of comparing a measurement pattern matrix and a registration pattern matrix while correcting a wearing position to determine whether there is a match.

As shown in FIG. 8, first, the measurement pattern matrix S * T is scanned horizontally and vertically in the cell unit (the spacing between PDs) from the registration pattern matrix X * Y while comparing the pattern matrices. Determine if it matches.

Since the horizontal scan range is 1 to (Y-T) and the vertical scan range is 1 to (X-S), the maximum number of comparisons is (Y-T) * (X-S) times.

If the pattern matrices are determined to match during the scan, a procedure of comparing the measurement pattern matrix and the registration pattern matrix for the next light source combination to determine whether they match is disclosed.

If it is determined that the pattern matrices do not match even though the scan is completed, as shown in FIG. 9, first, the measurement pattern matrix S * T is first divided into 1/2 cell units from the registration pattern matrix X * Y. 1/2) the horizontal and vertical shift scans of the intervals between PDs, comparing the pattern matrices to determine if they match.

If it is determined that the pattern matrices are matched during the scan, a procedure of comparing the measurement pattern matrix and the registration pattern matrix for the next light source combination by vertically and horizontally scanning the cell is compared to determine whether there is a match.

On the other hand, if it is determined that the pattern matrices do not coincide even after the scan is completed, the measurement pattern matrix S * T is determined in 1/4 cell units (1/4 of the interval between PDs) in the registration pattern matrix X * Y. While scanning horizontally and vertically, the pattern matrices are compared to determine if they match.

Still, if it is determined that the pattern matrices do not match, 1/8 cell unit (1/8 of the gap between PDs), 1/16 cell unit (1/16 of the gap between PDs), 1/32 cell unit ( Perform horizontal and vertical shift scan while switching to 1/32 of the gap between PDs), 1/64 cell units (1/64 of the gaps between PDs), and 1/128 cell units (1/128 of the gaps between PDs) do.

Nevertheless, if it is determined that the pattern matrices do not match, the measurement pattern matrix S * T and registration pattern matrix X * Y are treated as not matching, and the measurement pattern matrix and registration pattern for the next light source combination A process of determining a match is performed by comparing the matrix by horizontally and vertically scanning the cells.

10 is a diagram provided to explain an MPS-based personal authentication system according to an embodiment of the present invention. As shown in FIG. 10, the personal authentication system according to an embodiment of the present invention includes a biometric information registration device 100, a biometric device 200, a smartphone 300, and a personal authentication server 400. .

The biometric information registration device 100 generates registration pattern matrices (X * Y) for the user and registers them in the personal authentication server 400.

The biometric device 200 generates measurement pattern matrices (S * T) for the user and transmits them to the personal authentication server 400 through the smartphone 300.

The personal authentication server 400 registers the registration pattern matrix (X * Y) generated by the biometric information registration device 100 in the DB as biometric information (authentication information), and through the smartphone 300, the biometric device ( Compare with the measurement pattern matrix (S * T) received from the 200 to determine whether the match, and using the determination results to perform personal authentication.

As shown in FIG. 11, the biometric device 200 illustrated in FIG. 10 may include a power supply 210, an LED array 220, a PD array 230, an LPF & Amp 240, and an ADC 250. , A controller 260, a processor 270, and a communication unit 280.

The power supply 210 is implemented as a constant voltage source or a constant current source, and supplies power required for light emission of the LED array 220.

Since the LED array 220 and the PD array 230 have been described above, a description thereof will be omitted to avoid duplication.

The LPF & 240 performs filtering to remove noise from the photocurrent resulting from the photodetection by the PD array 230, amplifies the filtered photocurrent, and applies it to the ADC 250.

The ADC 250 converts the analog optical current signal output from the LPF & 240 into a digital signal and applies it to the processor 270.

The processor 270 generates measurement pattern matrices S * T by using the photocurrent signal transmitted from the ADC 250, and generates the measured pattern matrices S * T through the communication unit 280 through the smartphone. Send to 300.

The controller 260 controls the selective driving and intensity of the LED array 220 and the selective driving of the PD array 230. That is, the controller 260 controls only some of the LEDs constituting the LED array 220 to operate.

The controller 260 sets the cutoff frequency of the LPF & 240 and controls the gain. Processor 270 may be incorporated into controller 260.

Since the biometric information registration device 100 may be implemented in almost the same manner as the biometric device 200 shown in FIG. 11, a detailed description thereof will be omitted.

12 is a diagram illustrating another example of the biometric device 200. The biometric device 100 shown in FIG. 12 differs from the biometric device 200 shown in FIG. 11 in that it does not include the communication unit 280 but includes the DB 290.

The DB 290 stores registration pattern matrices X * Y.

The processor 270 of the biometric device 200 shown in FIG. 12 generates the measurement pattern matrices S * T by using the optical current signal transmitted from the ADC 250, and generates the generated measurement pattern matrices S. * T are compared with the registration pattern matrices X * Y stored in the DB 280 to determine whether they match, and personal authentication is performed using the determination results.

While the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims

Irradiating light on the wrist of the user;

Detecting light diffused by the wrist with a detector array of a first size, and registering a light detection pattern;

Irradiating light onto the wrist of the user;

Detecting light diffused by the wrist with a detector array having a second size to measure a light detection pattern;

Comparing the measured light detection pattern with the registered light detection pattern; And

And identifying a user using the comparison result.
The method according to claim 1,

The first size is,

A biometric method, characterized in that larger than the second size.
The method according to claim 2,

The detector array of the first size,

Detectors in the form of X * Y matrix,

The detector array of the second size,

Detectors in the form of S * T matrix,

A biometric method, characterized in that X> S and Y> T.
The method according to claim 3,

The registered light detection pattern is

The light detection data is an X * Y pattern matrix,

The measured light detection pattern is

A biometric method according to claim 1, wherein the light detection data is an S * T pattern matrix.
The method according to claim 4,

The spacing between the cell centers of the X * Y pattern matrix and the S * T pattern matrix is

Biometric method characterized in that the interval between the detectors.
The method according to claim 5,

The comparing step,

And scanning the S * T pattern matrix horizontally and vertically in units of cells from the X * Y pattern matrix, comparing the S * T pattern matrix with the X * Y pattern matrix.
The method according to claim 6,

The comparing step,

If it is determined that the S * T pattern matrix and the X * Y pattern matrix do not match, the S * T pattern matrix is scanned horizontally and vertically in 1 / n cell units from the X * Y pattern matrix, and the S * T pattern matrix is scanned. A biometric method comprising comparing a pattern matrix with the X * Y pattern matrix.
The method according to claim 7,

The comparing step,

And performing horizontal and vertical scan while increasing the n until it is determined that the S * T pattern matrix and the X * Y pattern matrix coincide.
The method according to claim 8,

The comparing step,

And when n becomes k, determining that the S * T pattern matrix and the X * Y pattern matrix are inconsistent.
A biometric information registration device that irradiates light on a wrist of a user, detects light diffused and reflected on the wrist with a detector array of a first size, and registers a light detection pattern in a server;

A biometric device for irradiating light onto the wrist of the user and detecting light diffused and reflected on the wrist by a detector array of a second size to measure a light detection pattern; And

And a server for comparing the measured light detection pattern with the registered light detection pattern and identifying a user using the comparison result.
A light source array for irradiating light to a wrist of a user;

A detector array of a first size for detecting diffusely reflected light of the wrist; And

And a processor configured to generate, transmit, and register a light detection pattern using a detection result of the detector array of the first size to a server.

The server,

Irradiating light onto the wrist of the user and detecting diffused reflections of the wrist with a detector array of a second size to receive a measured light detection pattern,

And comparing the received light detection pattern with the registered light detection pattern, and identifying the user by using the comparison result.
A light source array for irradiating light to a wrist of a user;

A detector array of a second size for detecting diffusely reflected light of the wrist; And

And a processor configured to measure and transmit a photodetection pattern to a server by using the detection result in the detector array of the second size.

The server,

Irradiating light onto the wrist of the user, and detecting light diffused on the wrist with a detector array of a first size, and registering the measured light detection pattern,

A biometric device, comprising: comparing a received light detection pattern with a registered light detection pattern and identifying a user using a comparison result.