KR20040087295A - A fingerprint recognition system and method using correcting position and presure - Google Patents

Abstract

PURPOSE: A fingerprint sensing system and method is provided to compensate for a user finger position and a pressure in getting fingerprint data so that it prevents noise, gets a clear fingerprint and minimizes an error rate. CONSTITUTION: The system comprises a memory(306), a fingerprint input module(301), a position determination module(302), a pressure determination module(303), a message output module(304), and a user authentication module(307). The memory(306) records the first fingerprint data. The fingerprint input module(301) reads the fingerprint data of a user finger. The position determination module(302) determines the position of the second fingerprint data gotten via the fingerprint input module(301). The pressure determination module(303) analyzes the second fingerprint data, and determines whether the pushing pressure is over a threshold. The message output module(304) outputs a message of a position compensation or pressure compensation instruction according to a control signal of the position determination module(302) and the pressure determination module(303). The user authentication module(307) compares the second fingerprint data with the first one stored at the memory(306) and authenticates the user according to a comparison data.

Description

Fingerprint detection system and method using finger position or pressure correction {A FINGERPRINT RECOGNITION SYSTEM AND METHOD USING CORRECTING POSITION AND PRESURE}

The present invention relates to a fingerprint detection system, and more particularly, in obtaining fingerprint data, by performing a correction operation corresponding to a position or a pressure of a user's finger, to prevent noise and to obtain more clear fingerprint data The present invention relates to a system for minimizing false positive rates.

With the development of today's industry, biomatrices are in the spotlight as a means to secure information and authenticate users. The reason why a user authentication means using a biomatrix based on an individual's physical characteristics (face, fingerprint, iris, etc.) is in the spotlight is that it is not necessary to carry a predetermined authentication means and duplication of the physical characteristics is difficult. . Among the user authentication means using the biomatrix, the technology related to the user authentication method and system based on the user's fingerprint is the most developed and proven security effect at this time. Fingerprints are ridges and valleys at the fingertips, and because of their immutability, they have been applied to various fields throughout society, including access control, criminal investigation, and social security cards, as the most efficient means of personal identification over the past 100 years. come.

However, there are no limitations to user authentication using fingerprints.

User authentication based on fingerprint is authenticated or not authenticated by comparing previously stored user's fingerprint data with the currently input user's fingerprint data. Therefore, when the position where the finger is placed is changed or when the pressure is changed, it is determined that the fingerprint data is different from the stored fingerprint data.

The present invention has been made to improve the prior art as described above, by allowing the user to correct the position and pressure of the finger in accordance with a predetermined criterion in the process of obtaining a fingerprint, to minimize the false authentication rate of user authentication The purpose.

1 is a view showing an entire system for requesting or performing a correction operation in a user and fingerprint detection system according to the present invention.

2 is a diagram illustrating a fingerprint sensing system according to an embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of a fingerprint sensing system according to an embodiment of the present invention.

4 is a view illustrating a light source unit and an image pickup unit of a fingerprint input unit according to an exemplary embodiment of the present invention.

5 is a block diagram showing an internal configuration of a signal processing unit according to the present invention.

6 is a diagram illustrating the determination of a position determination criterion by dividing the position determination criteria into up, down, left and right in the position determining unit according to an exemplary embodiment of the present invention.

FIG. 7 is a diagram illustrating the determination of the pressure determination criteria by horizontally and vertically in the pressure determination unit according to an exemplary embodiment of the present invention.

8 is a view showing an example of the operation of the display means according to an example of the present invention.

9 is a flowchart illustrating an example of an operation flow according to the fingerprint sensing system according to the present invention.

10 is an internal block diagram of a general purpose computer device that may be employed to perform the fingerprint sensing method in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

200: fingerprint detection system

201: fingerprint input unit

202: position determination unit

203: pressure determining unit

204: message output means

205 display means

206: memory means

207: user authentication unit

In order to achieve the above object and to solve the problems of the prior art, according to an aspect of the present invention, in the fingerprint detection system for performing user authentication, memory means for recording one or more first fingerprint data, the user's fingerprint including A fingerprint input unit for acquiring a fingerprint by placing a portion of a finger, a position determination unit for determining a position of second fingerprint data obtained from the fingerprint input unit, and analyzing the second fingerprint data and inputting the fingerprint input unit A position correction command for a portion of the finger or a pressure correction command for the pressure according to a control signal of the pressure determination unit, the position determination unit, or the pressure determination unit that determines whether the user's finger pressure is equal to or greater than a threshold value. Message output means for outputting a message; And a user authentication unit which compares the second fingerprint data with the first fingerprint data recorded in the memory means and authenticates a user.

According to another aspect of the present invention, in the fingerprint detection method for performing user authentication, recording one or more first fingerprint data, obtaining a fingerprint by passing a portion of the finger including the user's fingerprint Determining the position of the second fingerprint data obtained from the fingerprint input unit; analyzing the second fingerprint data to determine whether a finger pressure of the user input to the fingerprint input unit is greater than or equal to a threshold value; Outputting a message including a position correction command for a portion of the finger or a pressure correction command for the pressure according to a control signal of the position determination unit or the pressure determination unit, and writing to the second fingerprint data and the memory means Comparing the received first fingerprint data to authenticate a user; The fingerprint detection method is provided that.

Hereinafter, a fingerprint detection system and method for authenticating a user according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating an entire system for requesting or performing a correction operation in a user and a fingerprint sensing system.

As shown in FIG. 1, the fingerprint sensing system according to the present invention receives second fingerprint data from a user. Accordingly, the fingerprint detection system determines whether the second fingerprint data input by the user is obtained by the correct position and pressure, and when the determination result does not match a predetermined threshold value, the fingerprint detection system corresponds to the position or pressure to the user. Request a correction command. The user performs a correction operation of the position or pressure of the finger according to the request of the correction command, and performs the correction operation until confirmation of the fingerprint detection system. If the identification of the fingerprint detection system fails, the user stops the calibration operation, and the fingerprint detection system compares the user with the first fingerprint data stored in a predetermined memory means based on the acquired second fingerprint data of the user. Perform an authentication operation.

2 is a diagram illustrating a fingerprint sensing system according to an embodiment of the present invention.

As shown in FIG. 2, the fingerprint sensing system 200 according to an exemplary embodiment of the present invention may be largely configured to include a fingerprint input unit 210, a display unit 220, and a message output unit 230. . The finger is mounted to acquire the second fingerprint data by the fingerprint input unit, and the display means 220 or the message output means 230 operates to display a command of position correction or pressure correction.

3 is a block diagram illustrating an internal configuration of a fingerprint sensing system according to an embodiment of the present invention.

As shown in FIG. 3, the fingerprint detection system 3 00 includes a fingerprint input unit 301, a position determination unit 302, a pressure determination unit 303, a message output unit 304, a display unit 305, and user authentication. Section 307, and memory means 306.

First, the fingerprint input unit 301 obtains second fingerprint data from the user. The fingerprint input unit 301 may include a light source means 401, an image pickup unit 402, and a signal processor.

4 is a view illustrating a light source unit and an image pickup unit of a fingerprint input unit according to an exemplary embodiment of the present invention.

As shown in FIG. 4, when the finger is placed, the light source means 401 irradiates a predetermined light source with the finger, and captures the reflected image through the image capturing unit 402 using the predetermined imaging device. The second fingerprint data captured by the image capturing unit 402 may be a bitmap-type image, and may include a pixel. Each pixel of the bitmap image has a value of 0 to 255, and the darker the pixel, the lower the pixel value of the 0 to 255.

The imaging device may be an imaging device including a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

CCD (Charge Coupled Device) is a solid-state imaging device that is a kind of sensor that converts the light signal into an electrical signal. The CCD includes many optoelectronic devices called pixels or pixels, and is used in films of general cameras. In addition, CMOS (Complementary Metal Oxide Semiconductor) has the advantage of lower power consumption than CCD, but has a weak disadvantage compared to CCD.

In addition, the obtained second fingerprint data is converted into fingerprint data in a digital form through a signal processor. The signal processor will be described in detail with reference to FIG. 5.

5 is a block diagram showing an internal configuration of a signal processing unit according to the present invention.

As shown in FIG. 5, the gain of the input second fingerprint data is adjusted through the gain control amplifier 510 in the analog type second fingerprint data acquired by the image capturing unit. In addition, the second fingerprint data is converted into digital data through the A / D converter 520, a low-pass filter for performing noise filtering and removing image components of the subject through an image quality controller ( 530 and the subtractor together with the feedback of the line memory. At this time, the line memory is a memory that stores the output of the low pass filter 530.

The second fingerprint data obtained from the fingerprint input unit 301 is corrected based on the determination of the position determining unit 302 and the pressure determining unit 303.

In FIG. 3, the position determining unit 302 determines whether the position of the finger located in the fingerprint input unit 301 is correct. If the position determiner 302 determines that the position of the user's finger rest is not correct, a position correction command is generated, and if it is determined that the position is correct, the position determiner 302 performs a determination operation of the pressure determiner for the second fingerprint data.

First, the position determiner 302 classifies the acquired fingerprint data into coordinates, and calculates the total number of pixels recognized as the second fingerprint data in a predetermined coordinate space.

If the calculated number of pixels is larger than the predetermined number of reference pixels, it is determined that the finger has excessively invaded the predetermined coordinate space, and a position correction command for the movement of the finger is generated. A description of the position correction command will be described in detail with reference to FIG. 6.

6 is a diagram illustrating the determination of a position determination criterion by dividing the position determination criteria into up, down, left and right in the position determining unit according to an exemplary embodiment of the present invention.

As shown in FIG. 6, in the position determination of the position determining unit according to the preferred embodiment of the present invention, the photographed second fingerprint data is divided into four reference positions.

The first reference position is a horizontal upper portion of the second fingerprint data and corresponds to a dotted line portion of the drawing. The second reference position is a horizontal lower portion of the second fingerprint data and corresponds to the dotted line portion of the drawing, and the third reference position is a vertical left portion of the second fingerprint data and corresponds to the dotted line portion of the drawing. In addition, the fourth reference position is a vertical right portion of the second fingerprint data and corresponds to a dotted line portion in the drawing. If the number of pixels recognized as second fingerprint data is calculated from the total number of pixels corresponding to the first reference position, and the calculated number of pixels of the fingerprint data exceeds the number of reference pixels, the position determining unit 302 ) Determines that the finger has excessively invaded the upward direction in the direction of the first reference position, and generates a position correction command. As an example of the position correction command according to this, "Please put your finger down a little bit." In the same manner as described above, when the position correction is required based on the pixels of the second reference position, the third reference position, and the fourth reference position, a position correction command is generated.

In FIG. 3, the pressure judging unit 303 determines whether the user's finger depresses the fingerprint input unit 301 with a pressure equal to or lower than the reference pressure. When the user presses a finger at a pressure lower than the reference pressure or when the finger including the user's fingerprint is in a dry state, that is, when the adhesion between the fingerprint input unit 301 and the fingerprint is low, the second fingerprint data is blurred or sharp. Not. Therefore, the user must increase the pressure applied to the finger holding the fingerprint input unit 301 to increase the adhesion between the fingerprint and the fingerprint input unit 301. The method of correcting the pressure of the finger according to the present invention will be described in detail with reference to FIG. 7.

FIG. 7 is a diagram illustrating the determination of the pressure determination criteria by horizontally and vertically in the pressure determination unit according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the fifth reference pressure is the transverse center portion of the second fingerprint data according to the present invention, and the sixth reference pressure is the longitudinal center portion. When the average concentration of the pixel with respect to the fifth reference pressure and the sixth reference pressure is equal to or less than a predetermined reference concentration, the pressure determining unit determines that the adhesion between the user's finger and the fingerprint input unit is equal to or less than a reference, and provides a pressure correction command. Create As an example of this pressure correction command, generate a "Please press harder finger."

Next, in Fig. 3, the message output means 304 according to an example of the present invention, based on the position or the pressure correction command generated by the position determining unit 302 or the pressure determining unit 303, a predetermined message is sent. Output Accordingly, the user performs a position or pressure correction operation, and when the correction of the position or pressure is completed, the user outputs a confirmation message and outputs all messages related to user authentication.

In Fig. 3, the display means 305 according to an example of the present invention displays the position or pressure correction command together with the message output means 304, and displays various information related to the confirmation of the acquisition of the second fingerprint data and the user authentication. Information can be provided to the user. The display means 305 is described in detail in FIG. 8.

8 is a view showing an example of the operation of the display means according to an example of the present invention.

As shown in FIG. 8, the display means 205 according to the preferred embodiment of the present invention includes a current time, a position or correction command, an authentication time, and an authentication result.

The position or pressure correction command according to FIG. 8 is a command to increase the pressure at which the finger presses the fingerprint input unit. When the user confirms this, the pressure of the finger is increased and when the fingerprint detection system determines that the pressure is higher than the reference pressure, the user generates a confirmation command for acquiring the second fingerprint data. Accordingly, the authentication for the user is processed, and the authentication time 803 and the authentication result 804 for the user are displayed.

According to FIG. 3, the user authentication unit 307 performs the correction operation and compares the final second fingerprint data with the first fingerprint data of the user previously stored in the memory means according to the present invention. . The comparison method between the first fingerprint data stored in the memory means and the second fingerprint data input through the fingerprint input unit 301 may use the prior art as it is.

According to FIG. 3, the memory means 306 contains information related to user authentication.

The memory means is information related to user authentication, including an authentication time according to a user, an authentication date, and for storing information related to the user authentication, a flash memory, a memory stick, a hard disk, a magnetic disk, and a RAM (RANDOM ACCESS). MEMORY).

9 is a flowchart illustrating an example of an operation flow according to the fingerprint sensing system according to the present invention.

First, in step S901, a user inputs a fingerprint by placing a finger on the fingerprint detection system according to the present invention. The fingerprint sensing system irradiates a predetermined light source with the fingerprint, and acquires second fingerprint data corresponding to the reflected light through a predetermined imaging device (S902). The acquired second fingerprint data is converted into digital data through signal processing. With respect to the acquired second fingerprint data, the fingerprint detection system analyzes the position or the pressure based on pixel information of a predetermined area (S903). The second fingerprint data is determined to be inappropriate data for performing user authentication, and the user is informed about an operation to be corrected (S904). Accordingly, the user performs a correction operation including an operation of pushing a finger deeper or pressing more strongly based on the position or correction command (S905). If the fingerprint detection system determines that the second fingerprint data input by the user is suitable for performing the user authentication operation (S906), based on the obtained second fingerprint data, the first fingerprint of the user previously stored; The user authentication operation is performed by comparing with the fingerprint data. If the user matches, the user is authenticated (S907), and the status is notified to the user through the message output means or the display means (S908).

For the components not described in detail with reference to FIG. 9, the contents described in the embodiments related to the fingerprint sensing system may be applied as it is, and thus the detailed description thereof will be omitted herein.

10 is an internal block diagram of a general purpose computer device that may be employed to perform the fingerprint sensing method in accordance with the present invention.

The computer device 1000 includes one or more processors 1010 connected to a main memory device including a random access memory (RAM) 1020 and a read only memory (ROM) 1030. The processor 1010 is also called a central processing unit (CPU). As is well known in the art, the ROM 1030 serves to transfer data and instructions to the CPU unidirectionally, and the RAM 1020 typically transmits data and instructions bidirectionally. Used to. RAM 1020 and ROM 1030 may include any suitable form of computer readable media. Mass storage 1040 is bi-directionally coupled to processor 1010 to provide additional data storage capability, and may be any of the computer readable recording media described above. The mass storage device 1040 is used to store programs, data, and the like, and is a secondary memory device such as a hard disk which is generally slower than the main memory device. Certain mass storage devices such as CD ROM 1060 may be used. The processor 1010 may include one or more input / output interfaces, such as a video monitor, trackball, mouse, keyboard, microphone, touchscreen display, card reader, magnetic or paper tape reader, voice or handwriting reader, joystick, or other known computer input / output device. 1050 is connected. Finally, the processor 1010 may be connected to a wired or wireless communication network through the network interface 1070. Through this network connection, the procedure of the method described above can be performed. The devices and tools described above are well known to those skilled in the computer hardware and software arts.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of those claims.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible.

Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

By using the fingerprint detection system including the above configuration, the user to correct the position and pressure of the finger in accordance with a predetermined criterion in the process of obtaining a fingerprint, thereby minimizing the false authentication rate of user authentication.

Claims (7)

In the fingerprint detection system for performing user authentication, Memory means for recording one or more first fingerprint data; A fingerprint input unit for obtaining a fingerprint by passing a portion of a finger including a fingerprint of the user; A position determination unit for determining a position of the second fingerprint data obtained from the fingerprint input unit; A pressure determination unit analyzing the second fingerprint data to determine whether a user's finger pressure input to the fingerprint input unit is greater than or equal to a threshold value; Message output means for outputting a message including a position correction command for a portion of the finger or a pressure correction command for the pressure in accordance with a control signal of the position determining unit or the pressure determining unit; And A user authentication unit for authenticating a user by comparing the second fingerprint data with the first fingerprint data recorded in the memory means Fingerprint detection system comprising a. The method of claim 1, The fingerprint input unit, Light source means for irradiating a predetermined light source with a portion of the finger; An image pickup unit for obtaining an image of fingerprint data reflected by the light source means; And A signal processor for performing signal processing on the fingerprint data acquired by the image pickup unit; Fingerprint detection system further comprises. The method of claim 1, The position determining unit generates a position correction command based on the concentration of the fingerprint data detected in a region predetermined for the second fingerprint data, And the pressure determiner generates a pressure correction command by comparing a predetermined reference concentration with a concentration of the acquired fingerprint data. The method of claim 1, And the message output means outputs a confirmation message when the second fingerprint data acquired from the fingerprint input unit matches a reference value of a predetermined pressure or position. The method of claim 1, And display means for providing the user with predetermined information on the user authentication operation. In the fingerprint detection method for performing user authentication, Recording one or more first fingerprint data; Obtaining a fingerprint by passing a portion of a finger including a fingerprint of the user; Determining a location of second fingerprint data obtained from the fingerprint input unit; Analyzing the second fingerprint data to determine whether a user's finger pressure input to the fingerprint input unit is greater than or equal to a threshold value; Outputting a message including a position correction command for a portion of the finger or a pressure correction command for the pressure according to a control signal of the position determination unit or the pressure determination unit; And Authenticating a user by comparing the second fingerprint data with the first fingerprint data recorded in the memory means Fingerprint detection method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of claim 6.