KR100352170B1 - Method and Apparatus for A Numeral Code Generation of using Fingerprint Recognition Sensor - Google Patents

Abstract

The present invention relates to a digital input device of a digital portable device or a system having a limited key, and more particularly, to obtain a position average value of a fingerprint pixel based on an absolute coordinate value of a fingerprint pixel extracted from a fingerprint input sensor, and separately prepared. An apparatus and method for generating a numeric code using a fingerprint input sensor to search a code allocation table and generate a numeric code according to an assigned coordinate range.

Conventional keyboard method or number input method using a few keys shows excellent performance in input speed. Especially in case of portable phone, the number is input by using 12 keys. There was a difficult problem.

In addition, the method of directly installing the two-dimensional digitizer on the liquid crystal display has a limitation in efficiently entering numbers when the size of the liquid crystal display is small.

The present invention to solve the above problems,

A fingerprint input sensor for detecting and inputting a fingerprint image;

An analog / digital converter for converting a fingerprint image input as an analog signal through the fingerprint input sensor into a digital signal;

An image memory for storing a fingerprint image converted into a digital signal through the analog / digital converter;

An input / output interface for inputting / outputting a fingerprint image stored in the image memory;

A console for a fingerprint recognition system for recognizing fingerprint image data stored in the image memory through the input / output interface;

A microprocessor for controlling processing fingerprint image data stored in the image memory through the input / output interface;

A program memory for programming and storing a numerical input algorithm required for data processing of the microprocessor;

A working memory for storing a numeric code necessary for processing a fingerprint image and calculating a characteristic according to data processing of the microprocessor;

A font ROM for storing an object to be displayed on a screen, such as a number or a cursor generated during data processing of the microprocessor, in a predetermined format; And,

A liquid crystal display configured to display data processing results of the microprocessor,

A first step of inputting a fingerprint image;

A second step of preprocessing the fingerprint image input in the first step;

A third step of obtaining a gray scale average value of the fingerprint preprocessed in the second step or the number of fingerprint pixels;

A fourth step of determining whether a fingerprint image has been input as a gray scale average value of the fingerprint or the number of fingerprint pixels obtained in the third step;

A fifth process of calculating a position average coordinate of a fingerprint image and storing it in a work memory when a fingerprint is input in the fourth process;

A sixth step of searching for a number code table with a location average of a fingerprint stored in a work memory in the fifth step and generating and storing a corresponding number code;

Displaying a numeric code generated in the sixth step on a liquid crystal display;

An eighth step of determining whether a numeric code is generated when a fingerprint image is not input in the fourth step; And,

When the numeric code is generated in the eighth process, the ninth process may be performed after storing the generated numeric code in the working memory and returning it.

Therefore, according to the present invention, a device having a fingerprint input sensor analyzes pixels in fingerprint data to obtain a fingerprint position average, and retrieves a numeric code corresponding to the position average of the fingerprint from a table to display the numeric code on a liquid crystal display. When it is determined that the input has been made, the input result can be easily entered in a manner of confirming the input result, and by inputting the number using a fingerprint input sensor, it is effective to maintain double security in a system that must maintain high security.

Description

Numerical code generation device and method using fingerprint input sensor {Method and Apparatus for A Numeral Code Generation of using Fingerprint Recognition Sensor}

The present invention relates to a digital input device of a digital portable device or a system having a limited key, and more particularly, to obtain a position average value of a fingerprint pixel based on an absolute coordinate value of a fingerprint pixel extracted from a fingerprint input sensor, and separately prepared. An apparatus and method for generating a numeric code using a fingerprint input sensor to search a code allocation table and generate a numeric code according to an assigned coordinate range.

In general, the conventional keyboard method using Arabic numerals or the number input method using a few keys shows excellent performance in input speed.

Particularly, even in the case of a portable phone, a number is input using 12 keys, but there is a problem that it is difficult to reduce the volume.

In addition, a method of directly installing a two-dimensional digitizer under the liquid crystal display has a limitation in efficiently entering numbers when the size of the liquid crystal display is small.

Accordingly, the present invention was devised to solve the above-described problems, and obtains the position average value of the fingerprint pixel based on the absolute coordinate value of the fingerprint pixel extracted from the fingerprint input sensor, and searches a code allocation table separately prepared. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for generating a numeric code using a fingerprint input sensor capable of generating a numeric code according to an assigned coordinate range.

Numeric code generation device using a fingerprint input sensor of the present invention for achieving the above object,

A fingerprint input sensor for detecting and inputting a fingerprint image;

An analog / digital converter for converting a fingerprint image input as an analog signal through the fingerprint input sensor into a digital signal;

An image memory for storing a fingerprint image converted into a digital signal through the analog / digital converter;

An input / output interface for inputting / outputting a fingerprint image stored in the image memory;

A console for a fingerprint recognition system for recognizing fingerprint image data stored in the image memory through the input / output interface;

A microprocessor for controlling processing fingerprint image data stored in the image memory through the input / output interface;

A program memory for programming and storing a numerical input algorithm required for data processing of the microprocessor;

A working memory for storing a numeric code necessary for processing a fingerprint image and calculating a characteristic according to data processing of the microprocessor;

A font ROM for storing an object to be displayed on a screen, such as a number or a cursor generated during data processing of the microprocessor, in a predetermined format; And,

Characterized in that the liquid crystal display for displaying the data processing results of the microprocessor.

In addition, the numeric code generation method using the fingerprint input sensor of the present invention for achieving the above object,

A first step of inputting a fingerprint image;

A second step of preprocessing the fingerprint image input in the first step;

A third step of obtaining a gray scale average value of the fingerprint preprocessed in the second step or the number of fingerprint pixels;

A fourth step of determining whether a fingerprint image has been input as a gray scale average value of the fingerprint or the number of fingerprint pixels obtained in the third step;

A fifth process of calculating a position average coordinate of a fingerprint image and storing it in a work memory when a fingerprint is input in the fourth process;

A sixth step of searching for a number code table with a location average of a fingerprint stored in a work memory in the fifth step and generating and storing a corresponding number code;

A seventh step of displaying the numeric code generated in the sixth step on a liquid crystal display;

An eighth step of determining whether a numeric code is generated when a fingerprint image is not input in the fourth step; And,

When the numeric code is generated in the eighth process, the ninth process may be performed after storing the generated numeric code in the working memory and returning it.

1 is a block diagram of an apparatus for generating a numeric code using a fingerprint input sensor according to the present invention;

2 is a view illustrating a fingerprint input to a fingerprint input sensor according to the present invention;

3 is a diagram illustrating an embodiment of a numerical absolute coordinate arrangement region of a fingerprint input sensor according to the present invention;

4 is another exemplary view showing a numeric absolute coordinate arrangement region of a fingerprint input sensor according to the present invention;

5 is a flowchart illustrating a method of generating a numeric code using a fingerprint input sensor according to the present invention.

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

1: fingerprint input sensor 2: analog-to-digital converter

3: image memory 4: input / output interface

5: console 6: microprocessor

7: program memory 8: working memory

9: font ROM 10: liquid crystal display

1a: optics 1b: fingerprint input range

1c: fingerprint

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Numerical code generator using a fingerprint input sensor according to the present invention, as shown in Figure 1, the fingerprint input sensor (1) for detecting and inputting a fingerprint image; An analog / digital converter (2) for converting a fingerprint image input as an analog signal through the fingerprint input sensor (1) into a digital signal; An image memory (3) for storing a fingerprint image converted into a digital signal through the analog / digital converter (2); An input / output interface 4 for inputting / outputting a fingerprint image stored in the image memory 3; A console (5) for fingerprint recognition system for recognizing fingerprint image data stored in the image memory (3) via the input / output interface (4); A microprocessor (6) for controlling and processing fingerprint image data stored in the image memory (3) via the input / output interface (4); A program memory 7 for programming and storing a numerical input algorithm required for data processing of the microprocessor 6; A work memory (8) for storing a numeric code necessary for processing and characterizing a fingerprint image according to data processing of the microprocessor (6); A font ROM 9 for storing an object to be displayed on the screen in a predetermined format, such as a number or a cursor generated during data processing of the microprocessor 6; And a liquid crystal display 10 for displaying the data processing result of the microprocessor 6.

The fingerprint input sensor 1 may have a separate function of scanning only one line (row) or may be configured as a new element in the form of a fingerprint input sensor composed of only one line.

Numerical code generator using the fingerprint input sensor of the present invention configured as described above, the user can first detect the fingerprint of the finger in the fingerprint input range (1b) on the fingerprint input sensor 1 as shown in FIG. When contacted so that the fingerprint input sensor 1 detects the fingerprint 1c image of the contacted finger, generates a fingerprint 1c image of a predetermined format according to the contrast of the fingerprint 1c, and then converts the analog / digital converter. Output to (2).

On the other hand, the fingerprint input sensor 1 may use not only the finger fingerprint but also other means for detecting the shadow.

The analog-to-digital converter 2 converts fingerprint image data input as an analog signal from the fingerprint input sensor 1 into a digital signal and outputs it to the image memory 3.

The image memory 3 stores digital data for an image of the fingerprint 1c applied from the fingerprint input sensor 1.

The microprocessor 6 changes the gradation and position information of the pixel of the image input from the image memory 3 through the input / output interface 4 so as to meet the computer calculation standard, and then the gradation value is higher than the initial setting value. Store large pixels separately.

Here, the gradation value indicates the density of black / white as a number of 0 to 255 on the basis of the value visually confirmed, and the two gradation refers to the case where only two kinds of black and white are distinguished.

The input / output interface 4 matches the image memory 3, the console 5, the microprocessor 6, the liquid crystal display 10, and the console 5 is used only in the fingerprint recognition system.

The microprocessor 6 processes the fingerprint image data of the required area stored in the image memory 3 and then outputs the result as a corresponding number stored in the font ROM 9 through the liquid crystal display 10.

Here, when the fingerprint image data processing process of the microprocessor 6 is described in detail, the microprocessor 6 determines the number of pixels of the fingerprint 1c image, and then determines whether the fingerprint 1c is input as the number of pixels. do.

In this case, when the fingerprint input sensor 1 is an element that reads only one line, the gray scale average value of the image of the fingerprint 1c is obtained, and it is determined whether the fingerprint 1c is input as the gray scale average value.

When the fingerprint 1c is input as described above, the position average coordinate of the image is obtained and stored in the working memory 8, and then the numeric code table is searched by the position average of the fingerprint 1c, and the corresponding address is determined and searched. The code is generated and stored in the working memory 8.

Thereafter, the numeric code is searched for the predetermined address of the font ROM 9 and displayed on the liquid crystal display 10. On the other hand, the numeric code generated when it is determined that the fingerprint 1c is not input to the fingerprint input sensor 1 is a working memory. Store in the key value memory located at (8).

An embodiment of the present invention operating as described above will be described in more detail for each process as follows.

First, the initial setting value for the gradation value is determined according to the characteristics of the fingerprint input sensor 1 within the following range and stored separately in the program memory 7.

G _non <G ₀ <G _in

G _non : Gray level value of pixel when fingerprint is not input

G ₀ : Initial setting value

G _in : Gradation value of the input fingerprint pixel

At this time, if the initial setting value is made too small, the time taken to calculate the position average value becomes long. Therefore, an appropriate value should be selected by judging the gradation value range of the fingerprint image 1c output by the fingerprint input sensor 1.

Meanwhile, the digital fingerprint image 1c input through the fingerprint recognition center 1 is 360 pixels wide and 240 pixels high, and each pixel uses 256-bit analog / digital converter 2 in 256 steps. The gray level is generated. In the present invention, it is not necessary to generate 256 levels of gray levels, and only two levels of gray levels are possible.

In the present invention, since the height does not need to be 240 pixels and the minimum height is one pixel, the fingerprint input sensor 1 does not need to be of a quality enough to recognize fine lines of the fingerprint 1c. It is sufficient that an image of a located object can form an image as pixels separated by gray scale.

On the other hand, the position information in the horizontal direction 101 to 460, the vertical direction 101 to 340 to increase by one integer to correspond to the pixel 1: 1, and to simplify the calculation, it is cut off without calculation below the decimal point, and the data The arrays of are arranged in order of position by a pair of gray levels and position information. (The integer from 1 to 360 is acceptable.)

P = (G ₁ , X ₁ , Y ₁ ), (G ₂ , X ₂ , Y ₂ ), .... (G _i , X _i , Y _i ) ... (G _K , X _M , Y _N )

P: whole fingerprint image

G _i : Gray level (integer within 0 ~ 255)

X _i : the position of the horizontal axis (integer within 101 ~ 460)

Y _i : position of vertical axis (integer within 101 ~ 340)

Thereafter, the microprocessor 6 separates the pixels having a larger gray scale value than the initial setting value and stores them in the work memory 8 in the format of the fingerprint image 1c, while the pixels stored in the work memory 8 are stored. The number is counted and stored in the working memory 8, or a gray average value is obtained and stored in the working memory 8.

Gradation Mean Value: = {G ₁ + G ₂ ‥‥‥ G _K } / K

: Gradation Average

G: Gradation value of first pixel

k: the number of pixels

At this time, the microprocessor 6 determines whether the number of pixels stored in the working memory 8 is greater than 30 to determine whether a fingerprint is input. In this case, the reason for checking whether the value is larger than 30 is that the case of 6-7 high gradation pixels occurs due to contamination of the optical unit 1a of the fingerprint input sensor 1 and defects of the fingerprint input sensor 1. According to the characteristics of (1), the appropriate value may be adjusted and used. (However, when using the gray scale average value, the average value may be used when the fingerprint is input or not).

On the other hand, when it is determined that the number of pixels stored in the work memory 8 is greater than 30, that is, when a fingerprint is input, the position average of the fingerprint image 1c is obtained by the following formula (Equation 1), and then the position average is calculated by the work memory ( 8) to save.

[Equation 1]

(X ', Y') = ((X ₁ + X ₂ + .... X _M ) / M, (Y ₁ + Y ₂ + .... Y _N ) / N)

(However, for the fingerprint input sensor that can read only one line, the Y value does not need to be calculated.)

The position data is calculated using the fingerprint image 1c stored in the working memory 8.

On the other hand, after searching the numerical code table as shown in the following table (Table 1 or Table 2) as the position average of the fingerprint 1c to determine the corresponding address, and searching the designated address to generate the numeric code, the working memory 8 Store the numeric code in.

That is, when the fingerprint input sensor 1 is composed of two lines as shown in FIG. 3, the numeric code table shown in Table 1 is searched, and as shown in FIG. 4, the fingerprint input sensor 1 is set to one line. If so, search the numeric code table as shown in Table 2 to confirm the address.

In addition to the numeric codes shown in the following table (Table 1 or Table 2), cursors, character codes, and the like may be assigned to correspond.

At this time, when the numeric code stored in the working memory 8 is displayed on the liquid crystal display 10, the font data of the corresponding number embedded in the font ROM 9 is stored in the video RAM without increasing the memory counter. Displayed at the same position of the liquid crystal display 10.

On the other hand, when it is determined that the fingerprint 1c is not input to the fingerprint input sensor 1, the generated numeric code is stored in the key value memory located in the work memory 8 and then returned.

[Table 1] Numeric Code Table

Corresponding number Address Position average X coordinate range Position average Y coordinate range Numeric code * 0 101-150 221-340 One One One 151-200 221-340 2 2 2 201-250 221-340 3 3 3 251-300 221-340 4 4 4 351-400 221-340 5 5 5 401-460 221-340 6 6 6 101-150 101-120 7 7 7 151-200 101-120 8 8 8 201-250 101-120 9 9 9 251-300 101-120 10 0 10 351-400 101-120 11 # 11 401-460 101-120 12

[Table 2] Numeric Code Table

Corresponding number Address Fingerprint coordinates Numeric code * 0 100-130 One One One 131-160 2 2 2 161-190 3 3 3 191-220 4 4 4 221-250 5 5 5 251-280 6 6 6 281-310 7 7 7 311-340 8 8 8 341-370 9 9 9 371-400 10 0 10 401-430 11 # 11 431-460 12

In addition, even when the fingerprint 1c input to the fingerprint input sensor 1 continues to occur, the above operation is repeated.

An example of numeric input according to the present invention will be described below.

2 is an image 1c of a fingerprint located in the fingerprint input sensor 1.

The user determines and inputs the position of the fingerprint 1c in the fingerprint input range 1b based on the number printed on the upper portion of the fingerprint input sensor 1 in order to input the number “8”.

The fingerprint 1c input through the fingerprint input sensor 1 is displayed on the LCD screen of the liquid crystal display 10 via the analog / digital converter 2 and the image memory 3 (7). "8" may be displayed immediately).

Thereafter, the user does not remove the fingerprint 1c from the optical unit 1a of the fingerprint input sensor 1, but moves the position of the fingerprint 1c slightly to the right in the fingerprint input range 1b so that "8" appears on the screen. Is displayed.

At this time, since the user is an intended input, the user spaces the finger 1c vertically above the optical unit 1a of the fingerprint input sensor 1.

On the other hand, if the fingerprint 1c is not input, the microprocessor 6 determines that the fingerprint 1c is not input, and stores the generated numeric code in the working memory 8 and returns it.

In this case, the process of inputting the numbers continuously may be repeated.

3 illustrates a first step (S1) of inputting a fingerprint image as shown in FIG. 3; A second step (S2) of preprocessing the fingerprint image input in the first step (S1); A third step (S3) of obtaining a gray scale average value of the fingerprint preprocessed in the second step (S2) or the number of fingerprint pixels; A fourth step (S4) of judging whether a fingerprint image has been input as the gradation average value of the fingerprint or the number of fingerprint pixels obtained in the third step (S3); A fifth step (S5) of calculating a position average coordinate of the fingerprint image and storing it in the working memory when the fingerprint is input in the fourth step (S4); A sixth step (S6) of retrieving the number code table with the average of the positions of the fingerprints stored in the working memory in the fifth step (S5) and generating and storing the corresponding number code; A seventh step S7 of displaying the numeric code generated in the sixth step S6 on the liquid crystal display; An eighth step (S8) of determining whether a numeric code has been generated when a fingerprint image is not input in the fourth step (S4); And a ninth step (S9) of storing the generated number code in a working memory and returning the generated numeric code when the number code is generated in the eighth step (S8).

As described in detail above, in the numeric code generator using the fingerprint input sensor according to the present invention, a device having a fingerprint input sensor analyzes pixels in fingerprint data to obtain a fingerprint position average, and a number corresponding to the position average of the fingerprint. You can easily enter numbers by searching the codes on the table and displaying the numeric codes on the liquid crystal display and confirming the input result when judged as the intended input. Maintain high security by entering numbers using the fingerprint sensor. This has the effect of maintaining dual security on the systems that need to be.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (4)

A first step S1 of inputting a fingerprint image; A second step (S2) of preprocessing the fingerprint image input in the first step (S1); A third step (S3) of obtaining a gray scale average value of the fingerprint preprocessed in the second step (S2) or the number of fingerprint pixels; A fourth step (S4) of judging whether a fingerprint image has been input as the gradation average value of the fingerprint or the number of fingerprint pixels obtained in the third step (S3); A fifth step (S5) of calculating a position average coordinate of the fingerprint image and storing it in the working memory when the fingerprint is input in the fourth step (S4); A sixth step (S6) of retrieving the number code table with the average of the positions of the fingerprints stored in the working memory in the fifth step (S5) and generating and storing the corresponding number code; A seventh step S7 of displaying the numeric code generated in the sixth step S6 on the liquid crystal display; An eighth step (S8) of determining whether a numeric code has been generated when a fingerprint image is not input in the fourth step (S4); And, When the numeric code is generated in the eighth process (S8), the digit code generation method using a fingerprint input sensor, characterized in that the ninth process (S9) of storing the generated numeric code in the working memory and returning it. A fingerprint input sensor 1 for detecting and inputting a fingerprint image; An analog / digital converter (2) for converting a fingerprint image input as an analog signal through the fingerprint input sensor (1) into a digital signal; An image memory (3) for storing a fingerprint image converted into a digital signal through the analog / digital converter (2); An input / output interface 4 for inputting / outputting a fingerprint image stored in the image memory 3; A console (5) for fingerprint recognition system for recognizing fingerprint image data stored in the image memory (3) via the input / output interface (4); A microprocessor (6) for controlling and processing fingerprint image data stored in the image memory (3) via the input / output interface (4); A program memory 7 for programming and storing a numerical input algorithm required for data processing of the microprocessor 6; A work memory (8) for storing a numeric code necessary for processing and characterizing a fingerprint image according to data processing of the microprocessor (6); A font ROM 9 for storing an object to be displayed on the screen in a predetermined format, such as a number or a cursor generated during data processing of the microprocessor 6; And, And a liquid crystal display (10) for displaying data processing results of the microprocessor (6). The method of claim 2, The fingerprint input sensor 1, Device for generating a numeric code using a fingerprint input sensor having a separate function of scanning only one line (row), or configured as a new element in the form of a fingerprint input sensor consisting of only one line. The method of claim 2, The fingerprint input sensor 1, A numeral code generator using a fingerprint input sensor, characterized in that to display all or part of the number corresponding to the absolute coordinate on the top, bottom, left, or right of the optical unit (1a).