JPS62216071A - Securing method for system security - Google Patents

Abstract

PURPOSE:To improve the accuracy for confirmation of identity by making use of fingerprints. CONSTITUTION:A fingerprint 1 to be read and identified undergoes photoelectric conversion through an image sensor 2. Then image signals subjected to the photoelectric conversion are taken out by the sensor 2 and a feature extracting circuit 3 via a proper means like a binary-coding circuit, etc. and stored in an image memory 4. A command (a) is given to an input/output interface 8 to perform collation and identification of the fingerprint 1 through an automatic actuation system 9. A control processor 7 receives the command (a) and gives an instruction to an image processor 5 to check whether the relevant fingerprint 1 is coincident with the registered one or not. The result of this check is taken out of the interface 8 as a decision signal (b).

Description

[Detailed description of the invention] (Technical field to which the invention pertains) This invention uses an image sensor to read and identify fingerprints, and is used to improve social functions such as information/communications, finance, transportation, residence, and even personal life. Safety, crime prevention,
This invention relates to a method and device for ensuring security such as privacy.

(Background of the invention) With the development of social infrastructure technologies such as information and communication technology, transportation technology, and urban space technology, the aspects of social life, industrial and economic activities have become more sophisticated, and social communication, distribution, transportation, and production have become more sophisticated. , financial, and even housing systems are becoming more efficient and comfortable. However, on the other hand, the aspects have become more complex and the reliance on computerized system control has increased. For this reason, trust in the systems themselves is required, and it is extremely important to determine who is qualified to access the various systems, command the necessary information, or use the information the systems provide. It has become to.

In particular, determining who is qualified has become a socially important issue, and it has become an important technical issue as it is an issue of ensuring social and personal security and privacy in various situations. There is.

Traditionally, to ensure security and privacy,
Methods of identifying and determining eligible persons using magnetic cards, IC cards, etc. and monitoring using television cameras are adopted. However, with regard to card systems such as magnetic cards, although PIN numbers and other information are registered and identified, there are situations in which they can be easily used by people other than the card owner, card user registrant, or other qualified person. Although the card system is highly efficient, there are serious problems in terms of security and privacy. In addition, when monitoring with a television camera, it is possible to limit the
It is effective only in specific locations such as offices and banks, and its usage is limited, and in most cases, the identification and determination of eligible persons must be done by humans.

For this reason, a card system that can be used by many people over a wider range of areas and is highly efficient and convenient, as well as other systems that can be monitored using television cameras, can be used more efficiently and efficiently. A method for identifying and determining whether or not a social group or group of people is suitable for the development of an advanced information society and a card society, and a method for efficiently ensuring the security and privacy of four people. There was a need to realize a device for this purpose.

(Purpose of the invention) This invention was made in view of the above circumstances, and is intended to improve security such as safety, crime prevention, and privacy in various areas of society such as information, communication, finance, residence, transportation, and production. The purpose of this paper is to provide a method and device for securing the same.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention reads a fingerprint using an image sensor, and compares the read fingerprint with already registered fingerprints. It is characterized by identifying the identity and allowing only those qualified persons who have been identified to be able to access and use the system.

An overview of the method and apparatus of the present invention will be explained with reference to the accompanying drawings.

The figure is a block diagram showing an example of a system structure for implementing the method of the present invention in the case of a card system.

1 is the fingerprint of a specific individual to be read and identified;
2 is an image sensor, 13 is a circuit for feature extraction, 4
5 is an image memory, 5 is an image processing processor, 6 is a register memory for registered fingerprints, 7 is a control processor, and 8 is an input/output interface circuit. 9 shows various automatic actuation systems.

A fingerprint 1 to be read and identified is photoelectrically converted by an image sensor 2. As the image sensor, an appropriate one such as a photodiode or COD image sensor 1 can be used. In addition, there are various types of image sensors, including television cameras, as long as they are of high resolution and can read fingerprint patterns.
can be used as appropriate. This image sensor-2
Then, the feature extraction circuit 3 extracts the photoelectrically converted image signal as geometric image information using an appropriate means such as a binarization circuit, and stores it in the image memory 4.

A command (a) is given to the input/output interface 8 to perform fingerprint verification and identification. In the example shown in the figure, the command signal (a> is given through the automatic operation system 9. Upon receiving the command signal (a), the control processor 7 instructs the image processing processor 5 to register the target fingerprint. Have students identify whether they are the same thing or not.

The identified result (identical or non-identical) is determined by the decision signal, Q(b
) from the input/output interface 8. If the judgment signal (b) confirms that the person is qualified, the automatic work system 9 starts the necessary work.

Various tasks can be performed using the system 9, such as paying money, driving a means of transportation such as a car, operating a production factory, and opening/closing the door of a door, house, etc.

Fingerprint identification can be done in various ways, such as by dividing the lines of a fingerprint into minute sections, or by recognizing a linear pattern. Any of these can be adopted as appropriate. Features can be extracted by dividing pixels along the X-axis and Y-axis, determining the mutual distance between fingerprint lines, determining the fingerprint line area ratio, and the like. Further, registration in the dictionary memory can be performed as appropriate.

Of course, the method for ensuring system security of the present invention is not limited to the example shown in the figure.

For example, a unit such as a fingerprint dictionary memory, an image processing processor, etc. and a reading unit of an image sensor may be connected by means of communication or electric transmission, thereby forming a network of a terminal device and a central processing unit. Alternatively, the method for ensuring security of the present invention includes registering the fingerprints of multiple fingers of a specific individual so that even a qualified person will not be identified as such due to an error in fingerprint reading and identification. , it is also possible to provide an error recovery circuit that allows any of these to be used for discrimination.

Needless to say, all of these are within the scope of the present invention.

The method of the present invention can be used in combination with a card system such as a magnetic card or an IC card, or can be used in place of a computer password. Through terminal processing, a fingerprint is first verified, and after determining that the person is eligible, the computer system is activated. If necessary, verification can be performed once again before the computer data is retrieved.

For example, in the case of a card system such as a magnetic card or an IC card, by inserting the card into a terminal, a command (a) for fingerprint verification and identification is transmitted to the control processor, and at the same time, the fingerprint is detected by an image sensor. reading,
Identification also takes place. At this time, in case the identity verification using one fingerprint is unsuccessful, the fingerprints of other pre-registered fingers can be used for verification.

(Results of the invention) According to this invention, by using fingerprints, which are ultimately the only objective means of identification, qualified persons who can benefit from the efficiency and convenience of various social systems can be identified. It becomes possible to ensure the security of the above social system itself. This security method is the most reliable and extremely effective.

[Brief explanation of drawings]

The figure shows an example of the method and apparatus of the invention. Numbers and symbols in the figure indicate the following. 1. Target fingerprint, 2. Image sensor-1 3. Feature extraction circuit, 4. Image memory, 5. Image processing processor, 6. Fingerprint dictionary memory, 7. Control processor, 8. Input/output interface, 9. Automatic actuation system. Agent: Patent Attorney Toshio Nishizawa Proceeding Amendment (Seal issued) March 68, 1985 1. Indication of the case 1986 Patent Application No. 59849 2. Name of the invention Method for ensuring system security 3. Person making the amendment Relationship to the incident Patent applicant address: 4-112 Takatsunami-cho, Kariya City, Aichi Prefecture Name: Ando@
4, Agent (zip code 150) GS Heim Miyamasuzaka 903, Shibuya l-8-13, Shibuya-ku, Tokyo [Telephone Tokyo (79711081 representative)] Column 6 of "Detailed Description of the Invention" of the specification, amendment Add the following sentence next to the first line of page 8 of the details J). [Mana, more specifically, the fingerprint verification security system of the present invention includes a fingerprint image input device that images a subject's fingerprint, a terminal device that reads and stores reference fingerprint information, and a digital device that converts the input fingerprint image. An A/D exchange device that converts into a digital amount, a thinning device that extracts the valley line part of a fingerprint from the minimum value of the gray level converted into a digital amount, and a line thinning device that extracts end points and branch points that are feature points, and A feature point extraction device that maintains angles, a shared feature point candidate determination device that compares input fingerprint information and reference fingerprint information and selects shared minutiae candidates, and superimposes multiple end points and branch points, respectively. A coordinate transformation/pair minutiae determination device that calculates and evaluates and determines the number of matches of other minutiae points, and a coordinate transformation and rotation angle of each end point and branch point that have a match number of more than a certain number. and a matching amount determining device that stores the matching amount, calculates the matching amount from the value, and performs evaluation and determination. This system converts an individual's fingerprint information into an IC card, which the individual manages, and allows the individual to compare this fingerprint information with his or her own directly input fingerprint at a terminal when necessary. Alternatively, detailed fingerprint information can be registered in a large central storage device, and when necessary, the information can be retrieved from the central storage device via a communication line and compared with the input fingerprint information. By this thinning method that directly traces the valleys between the ridges,
Reduces the effects of fingerprint noise (fusion, fading, shorelines, etc.) and shortens processing time. In such a system, the above-mentioned line thinning device extracts valley lines by scanning once each in the horizontal and vertical directions, removes valley lines that are less than a certain length, and restores fine cuts. After performing this processing, the #l1rA image can be obtained by combining the two images. The system of the present invention may also include an image quality evaluation device that determines the sharpness of the input image based on the number of thin valley lines, and requests re-input if the number is less than a certain number. In the system of this invention, since the fingerprint is input based on the person's own thoughts, a relatively good image can be obtained. The ridges of a fingerprint (all previous verification systems use these ridges) are not smooth due to indentations caused by the shoreline and adhesions caused by pressure during stamping, but the valleys between the ridges are not affected by the shoreline. , with the system of this invention that tracks the highest pressure area, even if adhesions occur, if even the slightest depression remains, it can be made into a thin line, and basically it can be made into a thin line (extracting the trough) in one operation. This invention will be explained in more detail with reference to an example. For example, as an example of this system, one screen has 250 x
240 pixels, 1 pixel is 8 bits, and the input fingerprint is P
Processing is performed on the C-9801 under the management of MS-DO3 using a program created by an assembler and a C compiler, and the extracted feature point data is compared with reference data. To track the valley of a fingerprint, the point with the lowest density is selected and the valley is tracked smoothly, taking into account the past direction of travel. If the fingerprint of the line segment of the obtained thin line image is below a preset threshold, it is determined that the input image is of low quality and the user or subject is requested to re-enter the image. Recognition of feature points is determined using the number of inversions for the feature points. In this case, the direction is determined by tracing a thin line starting from the feature point and according to the direction of the vector. The direction of the branch point is, for example, two of the three vectors.
Let it be the direction of the vector between the two large angles. On this premise, the collation is performed as follows, for example. That is, points that are highly likely to be the same common points as the true minutiae in the input fingerprint data are selected from the reference data, and these points are used as shared point candidates. For one of the shared point candidates, one whose direction difference is near the corresponding screen is selected from the input data, and the reference screen is translated in parallel so that these two points overlap. Then rotate around this point. This operation is performed independently for each end point and branch point, and when the number of feature points matches at a certain threshold value or more, the translation amount and rotation angle of each end point and branch point are determined. Of course, the system of the present invention is not limited to the above example, and various variations are possible. According to this example, verification can be performed efficiently as a small processing system at the microcomputer level. Therefore, it can be widely used as a security system in stores, banks, etc. where terminals are installed. ”

Claims (1)

[Claims] An automatic system that operates only when the fingerprints are determined to be the same by comparison uses an image sensor to read the fingerprint, and an image processor to identify whether the fingerprint is the same as a fingerprint already registered in the dictionary memory. A method for ensuring system security, characterized in that the system operates only when the identity of the system is confirmed.