JPH0778248A - Individual authorizing device - Google Patents

Abstract

PURPOSE:To prevent another person from being decided erroneously as a principal or vice versa by displaying the face that the way of placing of a finger is incorrect to a person to be authorized. CONSTITUTION:The image of the finger 2 to be collated of the person to be authorized placed on a prism 3 is inputted to an image input device 1, and a feature extraction part 7 extracts the feature information of the finger 2 from an inputted finger image. A CPU 8 discriminates coincidence/ noncoincidence between both feature information by collating extracted feature information with the feature information for collation extracted from the finger of an individual registered on an IC card in advance. At this time, it is judged whether or not the way of placing of the finger 2 on the prism 3 is correct based on the feature information extracted by the feature extraction part 7. When it is judged that the way of placing of the finger is incorrect, a display par 10 displays such fact to the person to be authorized, and instructs the person to be authorized so as to correct the way of placing of the finger. In this way, a part of the feature information of the finger can be prevented from being omitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an entrance / exit management device for managing entrance / exit to an important facility, etc. Regarding the authentication device.

[0002]

2. Description of the Related Art In recent years, along with the development of an information-oriented society, there is a need for technology for identifying a person for the purpose of managing entry and exit from a specific area (important facility). In the past, personal identification was often done using a personal identification number or personal identification card (ID card), but these may be forgotten or lost, and there is also the risk of misuse by a third party. Yes, the limit of safety is becoming an issue.

Therefore, recently, a personal authentication device using a personal finger image has been developed. A personal authentication device using a finger image uses characteristic information contained in a finger. For example, a finger image input means including a prism as a finger rest, a light source, and a television camera captures image information of the finger, The collation is performed by using the addition signal obtained by adding the image information in the direction orthogonal to the as the feature information of the finger.

That is, when the abdominal surface of the finger is struck against the surface of the prism, the contact with the surface of the prism does not come into contact due to the unevenness of the skin of the finger formed by the fingerprint of the finger or the wrinkle pattern of the indirect part However, it comes out. In this state, when the finger surface of the finger is illuminated by the light source through the prism, the light is totally reflected inside the prism in a portion where the skin is not in contact, and ideally all the input light enters the television camera.

However, in the part where the skin of the finger is in contact, the condition of total reflection is not satisfied, and light diffusion occurs,
The light incident on the television camera becomes part of the input light. As a result, the image information of the finger having a contrast corresponding to the unevenness of the skin is captured by the television camera.

The image information of the finger thus input is added in the direction orthogonal to the length direction of the finger to obtain an addition signal. FIG. 6 schematically shows the image information Fx of the finger and the addition signal A (x) corresponding thereto. Addition signal A
(X) is a one-dimensional signal obtained by adding the pixel densities of the image in the direction y perpendicular to the longitudinal direction x of the finger. The addition signal A (x) has a steep valley at the horizontal wrinkle position corresponding to the first and second joints of the finger, and this information includes individuality.

Usually, the added signal is registered (stored) in advance in a dictionary (storage unit) as characteristic information of an individual's finger. Then, at the time of collation (at the time of personal authentication), the characteristic information of the finger obtained in the same manner is aligned with the characteristic information of the registered finger, and then collation is performed to determine the person or other person.

[0008]

However, in the above-mentioned conventional image input system, a signal cannot be obtained unless the prism surface and the finger pad surface are surely in contact with each other.
FIG. 7 shows, for example, the addition signal A when the second joint portion 2a of the finger 2 is lifted from the surface of the prism 3.
(X) is shown. FIG. 8 shows the addition signal A when the ventral surface of the finger 2 is firmly attached to the surface of the prism 3.
(X) is shown.

Comparing FIG. 7 and FIG. 8, in the addition signal of FIG. 7, information of the portion (3) near the second joint is lost. If the added signal as shown in FIG. 7 is registered as it is as the characteristic information of the finger, the information of the portion (3) near the second joint is missing. When 2 is set, there is a high risk of erroneously determining the other person as the person himself / herself.

When registering a dictionary, as shown in FIG.
When the whole is placed so as to contact the surface of the prism 3,
Since there is no information missing in the addition signal registered as a dictionary, there is a low risk of misidentifying another person as the person at the time of collation, but when the person puts it as shown in FIG. 7, the person is mistaken for the other person. There was a problem of making a decision.

Therefore, according to the present invention, it is possible to prevent a part of the characteristic information of the finger from being lost due to the improper placement of the finger with respect to the finger rest of the person to be authenticated. It is also an object of the present invention to provide a personal authentication device that can prevent a person from erroneously determining that the person is another person and can obtain high personal authentication ability.

[0012]

The personal authentication device of the present invention has a finger rest on which a finger of a person to be verified is placed, and an image input for inputting an image of the finger placed on the finger rest. Means, feature extracting means for extracting the characteristic information of the finger from the finger image input by the image inputting means, and storage means for storing the characteristic information of the collated finger previously extracted from the individual finger. Determining means for determining whether or not a predetermined relationship is established between the feature information by comparing the feature information extracted by the feature extracting means with the feature information stored in the storage means, Based on the characteristic information extracted by the characteristic extracting means, an aptitude determining means for determining whether or not the placement of the finger with respect to the finger placing portion is appropriate, and if the placement of the finger is not appropriate by the aptitude determining means. When judged, It is provided with a display means for displaying the effect.

Further, the personal identification device of the present invention has a finger rest portion on which a finger to be verified of the person to be authenticated is placed, and image input means for inputting an image of the finger placed on the finger rest portion, Feature extraction means for extracting feature information of a finger by adding pixel densities in a direction orthogonal to the length direction of the finger from a finger image input by the image input means, and a collation target previously extracted from a finger of an individual. By comparing the storage unit that stores the feature information of the finger for use with the feature information extracted by the feature extraction unit and the feature information stored in the storage unit, a predetermined value is stored between the two feature information sets. A determination unit that determines whether or not a relationship is established, and a division value in the length direction of the finger of the finger placement unit that is divided into a plurality of sections, and an added value of pixel densities in each section from the input image from the image input unit. And the calculation means for calculating By determining whether the added value is equal to or greater than a predetermined value, it is determined whether or not the finger placement on the finger placement portion is appropriate, and the aptitude determination means determines whether the finger placement is appropriate. And a display means for displaying the fact to the person to be authenticated when it is determined to be improper.

Furthermore, the personal identification device of the present invention has a finger rest on which a finger to be verified of the person to be authenticated is placed, and image input means for inputting an image of the finger placed on the finger rest, and the image input means. Feature extraction means for extracting feature information of a finger by adding pixel densities in a direction orthogonal to the length direction of the finger from a finger image input by the image input means, and a collation target previously extracted from a finger of an individual. By comparing the storage unit that stores the feature information of the finger for use with the feature information extracted by the feature extraction unit and the feature information stored in the storage unit, a predetermined value is stored between the two feature information sets. A determination unit that determines whether or not a relationship is established, and a division value in the length direction of the finger of the finger placement unit that is divided into a plurality of sections, and an added value of pixel densities in each section from the input image from the image input unit. And the calculation means for calculating An aptitude determining means for determining whether or not the placement of the finger with respect to the finger placing portion is appropriate by determining whether or not the added value is equal to or more than a predetermined value, and provided for each of the divided sections. And a display unit for displaying to the person to be authenticated that the placement of the finger is not appropriate in the portion corresponding to the section in which the added value is equal to or less than the predetermined value by the suitability determination unit.

[0015]

[Operation] Based on the characteristic information extracted from the input finger image, it is determined whether or not the placement of the finger on the finger placement portion is proper, and when it is determined that the placement of the finger is not proper,
By displaying the fact to the person to be authenticated, it is possible to prevent a part of the characteristic information of the finger from being lost due to improper placement of the finger on the finger rest of the person to be authenticated. Thereby, it is possible to prevent erroneous determination of another person as the person or erroneous determination of the person as another person.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. First, the first embodiment will be described. FIG. 1 shows the configuration of a personal identification device according to the first embodiment. In the figure, 1 is a finger 2 to be verified by the person to be authenticated.
An image input device for inputting an image of, for example, a prism 3 as a finger rest, a light source 4 for illuminating the ventral surface of a finger 2 placed on the prism 3, and a finger contact surface on the prism 3. Convert reflected light into an electrical signal, eg CC
It is configured by a D-type television camera (hereinafter abbreviated as TV camera) 5.

An A / D converter 6 converts an image signal obtained from the TV camera 5 into digital image information. A feature extraction unit 7 adds the image information output from the A / D converter 6 in the direction orthogonal to the finger to obtain the above-described addition signal A (x), which is used as the finger feature information. To do.

Reference numeral 8 denotes a CPU (Central Processing Unit), which controls the overall control. Reference numeral 9 denotes a storage unit such as a RAM (Random Access Memory), which stores characteristic information of fingers and the like, and is connected to the CPU 8. Reference numeral 10 denotes a display unit (for example, a liquid crystal display) that displays instructions to the person to be authenticated, and is connected to the CPU 8.

Reference numeral 11 denotes an IC card reading / writing device, which is I
The characteristic information (addition signal) of the finger of each person to be authenticated is written in the C card 12 for registration, or conversely, the characteristic information of the registered finger is read out from the IC card 12. , CPU8.

Reference numeral 13 denotes a host machine, which controls, for example, opening and closing of doors of important facilities and ringing of an alarm buzzer in response to a control signal from the CPU 8. The host machine 1
The control target of No. 3 differs depending on the security system to which the personal authentication device is applied.

The IC card 12 described above is constructed, for example, as shown in FIG. That is, electrical contact with a control element (for example, a CPU) 21 as a control unit, a nonvolatile data memory 22 capable of erasing stored contents, a working memory 23, a program memory 24, and the IC card reading / writing device 11 is performed. It is composed of a contact portion 25 for obtaining. Of these, the part within the broken line (control element 21, data memory 22,
The working memory 23 and the program memory 24) are composed of one (or a plurality of) IC chips and are embedded in the IC card body.

The data memory 22 is used to store various data, and is composed of, for example, an EEPROM or the like. The working memory 23 is a memory for temporarily holding processing data when the control element 21 performs processing, and is composed of, for example, a RAM. The program memory 24 is composed of, for example, a mask ROM, and stores the program of the control element 21 and the like.

The data memory 22 is divided into, for example, a control area 220, a directory 221, an empty area 222, and an area group 223, as shown in FIG. Each area has a directory 221.
It is managed by.

The directory 221 is, for example, as shown in FIG.
As shown in FIG. 3, the area definition information is composed of an area number 31, an area start address 32, a size 33, and a check code 34. For example, the top address 32 of area [01] is aaa address,
The area size corresponds to Sa bytes.

There are the following two types of access commands for these areas. One is a command for reading data in the area, for example, as shown in FIG.
As shown in, the function code indicating the read command and the number of the area to be accessed are included.

The other is a command for writing data in the area. For example, as shown in FIG. 13, it is composed of a function code indicating a write command, an area number to be accessed, and write data. To be done.

Here, the operation concept of the IC card 12 will be described with reference to the flowchart shown in FIG. As shown in the figure, the IC card 12 shifts to a command waiting state after electrical activation. At this point, the command is kept waiting, and when input, the area number in the command is extracted and it is checked whether or not the corresponding area number exists in the directory 221. If it does not exist, an error code indicating that there is no corresponding area is output, and the command wait state is returned.
If it exists, thereafter, processing is performed in each command routine corresponding to the function code in the input command, the processing result is output, and then the processing returns to the instruction data waiting state.

Next, the processing operation in the above configuration will be described. Before explaining the processing operation, the addition signal A
(X) will be described. As described above, FIG. 6 shows the image information Fx of the finger and the addition signal A corresponding thereto.
(X) is represented schematically. The addition signal A (x) is a one-dimensional signal obtained by adding the pixel density of the image in the direction y perpendicular to the longitudinal direction x of the finger. Further, the addition signal A (x) has a steep valley at a horizontal wrinkle position corresponding to the finger joint, and this information includes individuality. The image size in this embodiment is N in both the x direction and the y direction.
It is a pixel.

Now, the processing operation can be roughly divided into two processes, that is, "registration" and "verification". First, the registration processing operation will be described with reference to the flowchart shown in FIG. In step S1, a character string of a finger placement instruction "Please place your finger" is displayed on the display unit 10 to instruct the registered person to place the finger 2.

Next, in step S2, the registered person waits for the finger 2 to be placed on the prism 3. Details of the processing of this part will be described later. Next, in step S3, the image information of the finger 2 is fetched, and the density D of the image information is taken in the direction y perpendicular to the longitudinal direction of the finger 2 by using the following formula 1.
The addition signal A (x) is extracted by adding (x, y) (S4). Note that N in the equation 1 is in the x direction and y.
The number of pixels in the direction.

[0031]

[Equation 1]

Next, in step S5, the addition signal A
By using the information of (x), it is determined whether the placement of the finger 2 on the prism 3 is appropriate. Details of the processing of this part will be described later. There are the following five types of results of this aptitude judgment, and in the subsequent steps, they are distinguished by the value of pc.

1. (Pc = 0) It is a proper placement. 2. (Pc = 1) The fingertip is floating. 3. (Pc = 2) The vicinity of the first joint is floating.

4. (Pc = 3) The vicinity of the second joint is floating. 5. (Pc = 4) The base of the finger is floating. Next, in step S6, it is determined whether or not the value of pc is "1", and if it is "1", the fingertip is floating, so "the fingertip is floating" on the display unit 10. Please display the character string "Replace your finger" (S7), instruct the user to correct the way to place your finger, and return to the process of step S2. If the value of pc is not "1", step S
Proceed to the process of 8.

In step S8, it is determined whether or not the value of pc is "2", and if it is "2", the vicinity of the first joint is floating, so that "first joint" is displayed on the display unit 10. The character string "Please place your finger again." Is displayed (S9), the user is instructed to correct how to place the finger, and the process returns to step S2. If the value of pc is not "2", the process proceeds to step S10.

In step S10, it is determined whether or not the value of pc is "3". If it is "3", the vicinity of the second joint is floating, so that "second joint" is displayed on the display unit 10. A character string such as "Floating around. Please place your finger again" is displayed (S11), the user is instructed to correct how to put the finger, and the process returns to step S2. The value of pc is "3"
If not, the process proceeds to step S12.

In step S12, it is determined whether or not the value of pc is "4". If it is "4", the base of the finger is floating, so that "the base of the finger is The character string "Please place your finger again." Is displayed (S13), the user is instructed to correct how to place the finger, and the process returns to step S2. If the value of pc is not "4", the process proceeds to step S14.

The process reaching step S14 is p
This is a case where the value of c is "0", that is, the addition signal A (x) calculated in step S4 is obtained from the finger 2 that is properly placed. The addition signal A (x) is stored (registered) in the data memory 22 of the IC card 12 as the characteristic information of the finger 2.

Details of the process of waiting for finger placement in step S2 will be described with reference to the flowchart shown in FIG. First, in step S21, the image information of the finger 2 is fetched, and the sum SUM of pixel densities of the image information is calculated using the following equation 2 (S22). Note that N in the equation 2 is the number of pixels in the x direction and the y direction.

[0040]

[Equation 2]

Next, in step S23, the calculated sum SUM of pixel densities is compared with a preset threshold value, and if the SUM value is greater than or equal to the threshold value, the finger 2 is placed. A determination is made and the process proceeds to the next process (S3) in FIG. SU
If the value of M is not equal to or more than the threshold value, it is determined that the finger 2 is not placed, and the process returns to step S21.

Next, before describing the details of the finger placement method determination processing in step S5, an outline of the placement method determination method will be briefly described. As described above, FIG. 7 is an example in which the second joint portion 2a of the finger is raised. In the raised portion (3), the pixel density of the image information of the finger 2 is low, so that in the portion (3), the amplitude of the addition signal A (x) becomes extremely small. Therefore, the addition signal A (x) is divided into several parts, the total sum of the amplitudes of the addition signals is calculated for each part, and the sum is compared with a threshold value, so that part of the finger 2 rises. It is possible to determine whether or not there is.

In the case of FIG. 7, (1), (2),
It is divided into four parts (3) and (4). When the total sum of the amplitudes of the added signals A (x) in the respective portions does not exceed the threshold value, (1) the fingertip is floating.

(2) The vicinity of the first joint is floating. (3) The vicinity of the second joint is floating. (4) The base of the finger is floating. Can be judged as.

Now, the details of the process for determining how to place the finger will be described with reference to the flowchart shown in FIG. First, in step S31, the counter i is initialized to "1". Next, in step S32, the total sum Acc (i) of the addition signal A (x) in a certain range is calculated using the following mathematical expression 3.

[0046]

[Equation 3]

Next, in step S33, the total sum Acc (i) of the added signals A (x) thus obtained is compared with a preset threshold value, and if the value of Acc (i) is less than or equal to the threshold value. For example, it is determined that the finger 2 is floating in this portion, and the process proceeds to step S34. In step S34, pc is set to i and the process proceeds to the next process (S6) in FIG. If the value of Acc (i) exceeds the threshold value, it is determined that the finger 2 is not lifted up in this portion (it is properly placed), and the process proceeds to step S35.

In step S35, the counter i is incremented by 1, and the process proceeds to step S36. Step S3
In 6, the counter i is compared with "4", and if it is "4" or less, the process returns to step S32, and if it is "4" or more, the process proceeds to step S37. In step S37, it is determined that the finger 2 is properly placed, and [0] is substituted for pc, as shown in FIG.
To the next process (S6).

Next, the collation processing operation will be described with reference to the flowchart shown in FIG. Step S41
The processes from the waiting for the finger rest to the message display in step S53 are the same as those in the above-described registration process (S1.
The process is the same as S13).

If the value of pc is not "4" in step S52, the process proceeds to step S54. In step S54, first, the feature information is aligned using the following equations 4 and 5. That is, the addition signal read from the IC card 38 is used as the dictionary feature information Ad (i),
When the addition signal obtained from the input image information of the finger 2 is input feature information A (i), the sum of squared errors between Ad (i) and A (i + m) shifted by m is added over a certain range. Let S (m).

[0051]

[Equation 4]

[0052]

[Equation 5]

The value S (m) thus obtained is A (i +
m) and Ad (i) are parameters indicating the degree of coincidence, and the smaller the value of S (m), the closer the agreement. Alignment changes m within a certain range, and
M when the value of (m) becomes small is called a position shift amount,
It is assumed that the alignment has been completed at this M. Next, the difference E is calculated using the following equations 6 and 7.

[0054]

[Equation 6]

[0055]

[Equation 7]

E in the above equations 6 and 7 is 2 of the input feature information A (i + M) and the dictionary feature information Ad (i) which are aligned.
The sum of the squared errors over a certain range is normalized by the sum of squares of the dictionary feature information Ad (i) in the same range. E represents the degree of difference between the registered input feature information A (i + M) and the dictionary feature information Ad (i).
The larger the value of, the larger the difference between the two pieces of feature information, and the smaller the value, the more similar the pieces of feature information.

Next, in step S55, this value E is compared with a preset threshold value TH, and [E> T
H], it is determined that the two pieces of feature information do not match (S
56), the authenticated person is judged to be another person, and the collation process is terminated. If [E ≦ TH], it is considered that the two pieces of feature information match each other (S57), the authenticated person is determined to be the person, and the matching process is ended.

After the above collation processing is completed, the CPU 8
Sends the determination result of this person / others to the host machine 13. The host machine 13 performs processing according to the determination result, for example, opening the door when it is determined that the person is the person and sounding an alarm buzzer when the person is the other person. These processes differ depending on the security system to which the personal authentication device is applied.

Next, the second embodiment will be described. The structure of the device is the same as that of the first embodiment. However, the display means for indicating how to place the finger is not the display unit 10, but, for example, four light emitting diodes (LEDs) are used, and FIG. 15 shows an example of the arrangement. As shown in the figure, four light emitting diodes 14 to 17 are linearly arranged in the longitudinal direction of the finger 2 on the side of the prism 3 of the image input device, and the light emitting diodes in the portion where the finger 2 is raised emit light. By doing so, the person to be authenticated is instructed to replace the finger.

The processing flow is almost the same as in the first embodiment. FIG. 16 shows a flowchart of the registration process. As can be seen from comparison with FIG. 2, the difference is that steps S67 and S6 for displaying an instruction display to the person to be authenticated.
Only 9, S71 and S73. Each processing is to turn on only the light emitting diode in the portion where the finger 2 is determined to be lifted. The person to be authenticated sees the light emitting diode which is emitting light, knows the part where the finger is lifted up, and replaces the finger 2.

FIG. 17 shows a flowchart of the matching process. This is also the same as the registration process, steps S87, S89,
It is the same as the first embodiment except S91 and S93. As described above, in the second embodiment, a plurality of light emitting diodes 14 to 17 are arranged linearly in parallel with the longitudinal direction of the finger 2 on the side portion of the prism 3 as the display means, and the placement of the finger 2 is determined (S).
65) and (S85), by turning on only the light emitting diode in the portion which is determined to be floating, the person to be authenticated is instructed how to place the finger 2, and thus the first embodiment The same effect can be obtained.

In the above embodiment, the IC card is exemplified as the device for managing data, but the housing configuration is not limited to the card shape, and various modifications such as a rod shape and a block shape can be made. Further, the device is not limited to the portable storage medium and can be applied. Further, the configuration content can be variously modified without departing from the scope of the present invention.

Further, the IC card illustrated in the above embodiment uses the contact portion for exchanging data with the external device, but the contact is made with the external device by using, for example, light, electric field or magnetic field. Alternatively, a method of doing this may be used.

[0064]

As described above in detail, according to the present invention, it is possible to prevent a part of the characteristic information of the finger from being lost due to the improper placement of the finger on the finger rest of the person to be authenticated. As a result, it is possible to prevent an erroneous determination of another person as the person or an erroneous determination of the person as another person, and it is possible to provide a personal authentication device with high personal authentication capability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a personal authentication device according to a first exemplary embodiment of the present invention.

FIG. 2 is a flowchart illustrating a registration processing operation according to the embodiment.

FIG. 3 is a flowchart illustrating in detail a processing operation of waiting for finger placement in FIG.

FIG. 4 is a flowchart illustrating in detail the processing operation of the finger placement determination in FIG.

FIG. 5 is a flowchart illustrating a matching processing operation in the embodiment.

FIG. 6 is a diagram schematically showing image information of a finger and an addition signal corresponding thereto.

FIG. 7 is a diagram for explaining that information of an addition signal is missing depending on how a finger is placed.

FIG. 8 is a diagram for explaining that information of an addition signal is missing depending on how a finger is placed.

FIG. 9 is a block diagram showing a configuration example of an IC card.

FIG. 10 is a memory map diagram showing a configuration example of a data memory.

FIG. 11 is a diagram showing a configuration example of a directory set in the data memory.

FIG. 12 is a diagram showing a format example of a data read command.

FIG. 13 is a diagram showing a format example of a data write command.

FIG. 14 is a flowchart illustrating an initial operation of the IC card.

FIG. 15 is a view showing a display unit for instructing and displaying how to place a finger according to the second embodiment of the present invention.

FIG. 16 is a flowchart illustrating a registration processing operation according to the embodiment.

FIG. 17 is a flowchart illustrating a matching process operation according to the embodiment.

[Explanation of symbols]

1 ... Image input device, 2 ... Finger, 3 ... Prism, 4 ...
... light source, 5 ... TV camera, 6 ... A / D converter, 7 ...
... Feature extraction unit, 8 ... CPU, 9 ... Storage unit, 10 ...
Display, 11 ... IC card reading / writing device, 12 ...
… IC card, 13 …… Host machine, 14-17 ……
Light emitting diode (LED).

Claims (3)

[Claims] 1. An image input unit for inputting an image of a finger placed on the finger placing unit, which has a finger placing unit for placing a finger to be collated by the person to be authenticated, and a finger input by the image input unit. Feature extraction means for extracting feature information of a finger from an image, storage means for storing feature information of a finger to be collated extracted from an individual finger in advance, and feature information extracted by the feature extraction means Based on the feature information extracted by the feature extraction unit, a determination unit that determines whether or not a predetermined relationship is established between the feature information by collating with the feature information stored in the storage unit. Aptitude determining means for determining whether or not the placement of the finger with respect to the finger placing portion is appropriate, and when the aptitude placement is determined to be incorrect by the aptitude determining means And a display means for displaying that effect. Personal authentication device according to claim the door. 2. An image input unit for inputting an image of a finger placed on the finger placing unit, which has a finger placing unit for placing a finger to be collated by the person to be authenticated, and a finger input by the image input unit. Feature extraction means for extracting the feature information of the finger by adding pixel densities in the direction orthogonal to the length direction of the finger from the image, and the feature information of the finger to be collated previously extracted from the individual finger is stored. By comparing the stored storage means with the characteristic information extracted by the characteristic extraction means and the characteristic information stored in the storage means, it is determined whether or not a predetermined relationship is established between the two characteristic information. Determination means for determining, divided into a plurality of sections in the finger length direction of the finger rest,
An arithmetic means for obtaining the added value of the pixel densities in each section from the input image from the image input means, and a finger placing part by determining whether the added value obtained by the arithmetic means is a predetermined value or more. An aptitude determining means for determining whether or not the finger placement is appropriate for the user, and when the aptitude determining means determines that the finger placement is not appropriate, the fact is displayed to the person to be authenticated. A personal identification device comprising a display means. 3. An image input unit for inputting an image of a finger placed on the finger placing unit, which has a finger placing unit for placing a finger to be collated by the person to be authenticated, and a finger input by the image input unit. Feature extraction means for extracting the feature information of the finger by adding pixel densities in the direction orthogonal to the length direction of the finger from the image, and the feature information of the finger to be collated previously extracted from the individual finger is stored. By comparing the stored storage means with the characteristic information extracted by the characteristic extraction means and the characteristic information stored in the storage means, it is determined whether or not a predetermined relationship is established between the two characteristic information. Determination means for determining, divided into a plurality of sections in the finger length direction of the finger rest,
An arithmetic means for obtaining the added value of the pixel densities in each section from the input image from the image input means, and a finger placing part by determining whether the added value obtained by the arithmetic means is a predetermined value or more. An aptitude determining means for determining whether or not the finger is properly placed with respect to the finger, and a portion provided corresponding to each of the divided sections, the portion corresponding to the section in which the added value is equal to or less than a predetermined value by the aptitude determining section. And a display unit for displaying to the person to be authenticated that the placement of is not proper.